Hantianxia: Making BAW filters with the best performance!

The "2021 Hard-core Chinese Chip" selection event hosted by Xin Shiye is in full swing. More than 100 domestic chip companies have signed up to participate in the selection, and more than 200 products will meet with a large number of electronic engineers.

We are now using the "cloud exhibition" to fully display Chinese chip products and enterprises for you. At the same time, please cast your precious vote for the advancement of Chinese chips!

Online voting time

August 15th - September 14th

2021 Best domestic RF chip

2021 Excellent Domestic Substitution Performance Enterprise

2021 Best IC Enterprise Manager Award

The company is mainly engaged in the research and development, production and sales of high-performance RF filter chips for 4G/5G mobile communication applications. Its core products are bulk acoustic wave (BAW) filter chips (including duplexers and multiplexers) based on MEMS technology and RF front-end modules.

B3 Duplexer

①Product performance:

The B3 duplexer is the company's first high-performance, low-cost, miniaturized duplexer developed based on BAW technology, following the 2.4GHz WiFi coexistence filter, LTE TDD filter-B40, and 5G large bandwidth filter n41. The duplexer is a passive device that uses two bandpass filters of different frequencies to isolate the transmit signal from the receive signal, allowing the transceiver to simultaneously receive and transmit signals. In most mobile communications, the gap between the transmission frequency and the receive frequency is not large. Therefore, one of the key requirements of the duplexer is how to separate the receiver frequency from the transmitter frequency. The isolation of Hantianxia's B3 duplexer exceeds 55dB, which can effectively solve the isolation problem between uplink/downlink and meet the current market's basic needs for duplexers. In addition, Hantianxia's B3 duplexer also has excellent performance such as low insertion loss, high power handling, and miniaturized package size.

② Price competitiveness:

1) Currently, prices in the entire RF filter industry are polarized:

● International giants monopolize the high-end market: Two American companies (Broadcom and Qorvo) that master core technologies firmly occupy the high-end market, and their performance advantages give them very high pricing power;

● Insufficient performance in the low-end market: Although a small number of low-end filter companies have insufficient product performance, their low prices can still gain a certain share of the low-end market.

2) Hantianxia targets the mid-range blue ocean market:

●Market positioning: Hantianxia’s products have locked in the broad area between the high-end and low-end markets with performance comparable to similar products of US and Japanese giants and more competitive price positioning.

●Price advantage: On the premise of achieving almost the same performance, the pricing of Hantianxia's products is more than 20% lower than that of imported RF BAW filters, truly achieving the best cost-effectiveness. The price is extremely competitive in the market, and is more conducive to domestic substitution.

③Technological innovation:

Duplexer chips not only need to meet the primary requirements of low insertion loss and high out-of-band suppression like filter chips, but also need to have technical indicators of high isolation and high integration. Isolation refers to the stopband attenuation of two equivalent band-stop filters. Hantianxia innovatively applies the FBAR technology accumulated by the company over the years to the design of duplexers, thereby improving the isolation of duplexers and reducing their size.

1) Using FBAR technology to improve duplexer isolation

The duplexer manufactured with FBAR technology has unexpected unique advantages. For example, it can be used to eliminate noise interference during calls. Noise is everywhere in communication terminals. In fact, noise is a kind of electromagnetic wave interference. It poses a severe challenge to our communication capacity. If the noise problem cannot be overcome well, then even the best device defects will be fatal.

2) Using FBAR technology to reduce the size of the duplexer

In the past, the duplexer was large in the communication terminal, wasting precious space. If the battery size continues to decrease with the development of technology, the duplexer will become the largest device in the mobile phone. The duplexer using FBAR technology can be reduced to half of the original size, so the RF duplexer using FBAR technology can realize smaller mobile communication terminals, which is more useful for realizing more mobile terminal functions.

④Customer Service:

Hantianxia always adheres to the customer demand-oriented approach and develops collaboratively with customers.

●Core technology, quality assurance: The company's accumulated core technology advantages are innovatively applied to the development of the B3 duplexer, breaking the international technology monopoly and greatly improving the product performance of the duplexer. At the same time, Hantianxia has a complete ISO9000 quality management system, providing customers with satisfactory products with high-performance product quality. The B3 duplexer launched this time received good feedback from customers during the customer trial period, providing a customer base for further mass production of the product.

●Price advantage and timely delivery: The product performance is comparable to that of the international market, and the price is 20% lower than that of imports, which truly achieves the best cost performance. At the same time, Hantianxia has created a unique CIDM operation model in terms of production capacity, and continuously increased investment in independent and controllable production lines to fully guarantee the company's production capacity and product delivery time. With the best price and safe delivery time, we win the trust of customers.

● Customer demand-oriented: In the long-term and stable cooperative relationship with customers, Hantianxia has gradually explored the different emphases of performance requirements of different customer groups, and developed more targeted products based on customer needs. At the same time, Hantianxia always maintains its forward momentum and continuously improves exclusive technical support plans for customers.

●Sharp market response: "Moore's Law" has always been the development law followed by the integrated circuit industry, which is enough to illustrate the speed of development of the integrated circuit industry. Hantianxia keenly captures customer needs in the ever-changing market, is not afraid of the technology monopoly of leading companies in the international market, independently develops, forms independent intellectual property rights, and provides customers with safe, reliable and more competitive products to meet more customer needs.

● Existing customer base: The product has entered the supply chain system of more than 70 smart terminal customers and has been successfully installed on various platforms such as Unisoc UIS8910 Cat.1 and Qualcomm 9X07. These platforms will be used to support wireless communications such as mobile communications, navigation positioning, and the Internet of Things.

⑤Application case introduction:

Duplexers play an important role in modern mobile communications. They are widely used in the fields of communications and electronic warfare. They are an indispensable core component of the RF front-end module in the future 5G network. They can be used for antenna input and output to achieve the separation of transmit and receive signals. They enable two frequency bands with a certain interval to obtain greater isolation. However, with the rapid development of current wireless communication technology, a variety of communication standards have been proposed, making limited spectrum resources more scarce, and the interference between frequency bands has become more serious, which puts more stringent requirements on the performance of duplexers, one of the important components of the RF front end. However, my country started late in the field of duplexers, and there is still a large gap in technology level with Japan, the United States and other countries. Hantianxia already has a mature design solution for a single filter chip. On this basis, it innovatively introduces a matching network that is easy to integrate ICs and is conducive to increasing isolation, so as to realize the design of a duplexer with high isolation. The B3 duplexer participating in this evaluation has high isolation, low insertion loss, and realizes the combination of multi-band branch components using the same antenna cooperator, providing a better solution for miniaturized terminal customers. It also marks that Hantianxia has begun to lay out its products for duplexers and multiplexers. The B3 duplexer has achieved small-batch production and entered client trials in 2020, and has received good feedback from customers.

Applications of B3 duplexer products:

● Help customers develop new products and save costs: The B3 duplexer's miniaturized size of 1.8 mm × 1.4 mm enables high integration, helping customers develop and produce emerging 4G/5G standard mobile phones, which is conducive to realizing more functions; at the same time, the miniaturized size helps customers save consumables costs to a great extent.

● Help customers optimize language quality: B3 duplexer, the transmit passband insertion loss is less than 2.0 dB, the receive passband insertion loss is less than 2.5 dB. The low insertion loss helps customers minimize current consumption, reduce the noise generated by the transmitter in the receiving frequency band, improve sensitivity and dynamic range, thereby improving the signal clarity of the product and optimizing language quality.

● Help customers extend battery life: With a power handling capacity of no less than 30dBm, the high performance of the B3 duplexer can help customers greatly extend battery life.

The miniaturized size and high-performance B3 duplexer provide mobile phones and data terminals with the advantage of high bidirectional isolation, facilitating the development of emerging products adapted to the 4G/5G era and improving product performance and quality.

Reasons to vote for Han Tianxia:

1. Company Profile

Suzhou Handianxia Electronics Co., Ltd. was formerly Guizhou Zhongke Handianxia Microelectronics Co., Ltd., which was established in July 2015. In July 2019, it was settled in Suzhou Industrial Park as a major investment attraction project and was renamed Suzhou Handianxia Electronics Co., Ltd. It has R&D, sales, business and production centers in Beijing, Shenzhen, Hong Kong and Shaoxing. The company's core products are bulk acoustic wave (BAW) filter chips and RF module chips based on MEMS technology for 4G/5G mobile terminals. The R&D team has overcome key processes and systematically mastered the relationship between device structure and performance parameters, obtained and owned a number of core intellectual property rights for RF filter chips, and is the first company in China to fully master BAW filter mass production technology. The company has undertaken the National 02 Special Project - the development and planning application of key core chips such as high-performance filters based on MEMS technology (2017-2019). In 2020, the company was rated as a national high-tech enterprise and a private technology enterprise in Jiangsu Province; an advanced enterprise in intellectual property work in Suzhou Nano City; its core products have successively won the 2019 "Hard-Core China Core" Best RF Chip Award, the 2020 "Hard-Core China Core" Most Development Potential Award, and the 15th "China Core" Outstanding Technology Innovation Product; the core team won Suzhou City's top talents (team), Jinji Lake leading talents, etc.

2. The company took the lead in mastering BAW mass production technology and is committed to domestic substitution

1. Business areas and market structure

In response to the new technical requirements for RF filter chips in the 4G/5G network era, the company develops high-performance, ultra-small, low-cost, high-power BAW RF filters, duplexers, multiplexers and other filter chips based on thin film bulk acoustic wave resonator technology, focusing on the RF filter device field of wireless communication RF front-end modules. RF filter is the largest sub-industry in the RF field, and filters are the products with the highest output value in all fields of RF front-end. After the global BAW filter industry experienced a technological pioneering period before 1980 and a technological germination period from 1980 to 2000, it was able to develop and promote rapidly from 2000 to 2006, and gradually matured after 2006. BAW technology after 2006 mainly focused on the improvement of existing technologies to meet new market demands and technical standards. Driven by 5G, the increase in 5G mobile phone shipments and market penetration will drive the continued increase in filter market penetration. From 2016 to 2020, the global RF filter market size will grow from US$5 billion to US$15 billion, with an average compound growth rate of 31.6%. According to forecasts, BAW filters will occupy 61% of the RF filter market by 2022, and the market size is expected to exceed US$28 billion by 2025. In the field of RF filters, only a few international manufacturers have mastered the mass production technology of BAW filters, of which Broadcom and Qorvo have a market share of more than 95%; and SAW filters are basically monopolized by Japanese and American giants such as muRata and RF360. There are no domestic companies that produce and ship BAW filters in large quantities.

2. Break the international monopoly and achieve domestic substitution

The technology related to RF filter chips has been pioneered by Avago in the United States since 1980. After 40 years of development, its patents and technical barriers are very high, which is also the main reason why the relevant industries in my country have been stuck. After 40 years of development, major IDM manufacturers in the United States and Japan have deployed intellectual property rights in the design, manufacturing, and packaging of BAW filters, including the manufacture of resonator units, the construction of resonator unit models, strategies to improve the isolation of duplexers and multiplexers, strategies to improve the resonance performance of resonator units, and wafer-level packaging solutions. This has seriously hindered the localization process of my country's RF filter chip industry, especially high-end products such as duplexer and multiplexer high-frequency filter chips.

As mentioned above, due to the extremely complex design and process of BAW filter chips, extremely high technical barriers, and insufficient accumulation of domestic BAW filter technology and processes, there are very limited manufacturers that can directly enter the BAW filter market, and no company has yet mass-produced and shipped. Hantianxia is the first company in China to fully master the mass production technology of BAW filters. It has broken through foreign patent and technology blockades in design, process, packaging, etc., and has successfully manufactured high-performance high-end RF front-end filter chips through independent research and development. At present, the company has two filter chips in mass production, and has completed two and three performance and size iterations respectively; the duplexer chip has entered customer trials, with considerable customer reviews, and is about to enter pilot production; the 5G high-frequency band large-bandwidth N41 filter chip has completed the preparation of two package size prototypes and entered customer trials. Since the product was launched on the market, it has been supplied to more than 70 customers, with high product reliability, good market response, and unanimous praise from customers. It has been successfully delivered to mobile phone manufacturers such as Coolpad and Fuxi and IoT application providers such as Sunsea Smart and Meige Smart. In November 2020, Hantianxia's monthly shipments exceeded 10 million for the first time, ranking first in China. As of May 2021, the cumulative shipments of the company's filter chips have exceeded 120 million. The company will continue to increase its patent layout, strengthen independent innovation and R&D efforts, and strive to break the international technology blockade and monopoly, so that the "Chinese chip" can be safe and reliable, and domestic substitution can be achieved.

3. Created the CIDM business model to help the company develop rapidly and accelerate the process of domestic substitution

BAW filter chips based on MEMS processing technology use a large number of non-standard processing steps, and the manufacturing difficulty is much higher than that of traditional IC chips. At present, foreign BAW filter manufacturers all adopt the IDM model (integrated design and manufacturing, that is, the company has its own chip production line), which requires companies to make heavy asset investments in research and development to build production lines. This requires a long period of resource accumulation. This model is not conducive to the rapid advancement of the research and development and production process of small and medium-sized enterprises and the rapid improvement of the country's competitiveness in this field due to its long time cycle and large capital investment. At the same time, the investment of enterprises in production lines is difficult to bring profits in the short or even medium term, but has become a constraint on the development of small and medium-sized enterprises.

Hantianxia currently adopts the CIDM model, which is as follows: in the early R&D stage, relying on its leading advantages in technology, it completely independently completes the chip design work; in the processing and manufacturing stage, it chooses to cooperate deeply with the wafer foundry and dispatches R&D personnel directly to the foundry's production line to provide technical guidance to the foundry operators for parameter debugging and realize product development; some core equipment on the entire process line is provided by Hantianxia, ​​and the production line is dedicated to Hantianxia, ​​used by the foundry to complete production and manufacturing. This model effectively avoids the problems of high management costs, high operating expenses, and low capital return in the traditional IDM model, which not only ensures the full control of product production and R&D, but also ensures the rapid breakthrough of core technologies by the process team.

3. Core technologies and competitive advantages: BAW filters with the best performance

The RF filter chip is the core component of the RF front-end module. It directly determines the communication mode and user experience that the terminal can support, and is the cornerstone of wireless communication. With the evolution of 4G/LTE, the popularization of 5G, and the introduction of the Wi-Fi 6 protocol, people's demand for wireless communication technology continues to increase, and the complexity of wireless communication application scenarios has also increased significantly. The next generation of wireless communication equipment must meet the requirements of higher data throughput, larger bandwidth, shorter network latency, support for multi-frequency and multi-mode, and more miniaturization. Therefore, a variety of technologies such as large-scale array antennas, carrier aggregation, and orthogonal frequency division multiple access have been proposed and are expected to be widely used in the next generation of communications. These demands have driven global wireless communication technology into a new network architecture and promoted technological innovation in the global RF device industry.

BAW filters based on MEMS technology have the advantages of low insertion loss, high out-of-band suppression and steep edge roll-off. They can meet the strict coexistence requirements of the difficult 4G/LTE and new 5G high-frequency bands, solve the signal interference problem between frequency bands at high frequencies, and achieve the tiny package size required for high integration, and extend the battery life of the hardware. In 5G network technology and vertical application scenarios, this technology has proposed a better solution to the problem of data transmission interference in different frequency bands. It has unique advantages and will be explosively applied in higher frequency band terminals. It can be applied to mobile terminals such as mobile phones, communication base stations, the Internet of Things, the Internet, the Internet of Vehicles, aerospace and other RF communication fields. The main customers are mobile phone manufacturers, Internet of Things application providers and module product suppliers.

After eight years of technical research and industrial exploration, Hantianxia has independently developed its core technologies. The core technologies of BAW filters that have been accumulated include:

●Structural innovation to improve resonator quality factor technology

● Standardized process for cavity-type thin film bulk acoustic resonator based on MEMS technology

●Wafer level bonding packaging process

●Design of high isolation and high integration duplexer/multiplexer

Frequency correction technology

The company has mastered the key design technology and process technology of BAW filter chips, and its product technical indicators are comparable to those of international giants. The performance indicators of some products are compared as follows:

1. B40 filter

●The insertion loss of similar domestic products is currently maintained at more than 1.5dB, while the Hantianxia B40 filter can reach a lower 1.2dB, which is a significant improvement over similar competitors and is consistent with similar products of American companies that monopolize the filter market;

●It has obvious advantages in suppressing low WiFi channels;

●The second harmonic performance at high power is significantly improved compared to the old version, and the performance is better than that of international competitors;

2.2.4GHz WiFi filter

● The coexistence test performance of the company's WiFi and B40 frequency bands has been significantly improved. When the 1st to 3rd channels of 2.4GHz WiFi adopt the co-transmission and co-reception mechanism, the sensitivity does not change, while when B40 is turned on for channels 4 to 6, the coexistence index of B40 and WiFi bands is significantly improved;

●B40, B7, and n41 have obvious advantages in inhibition;

●Good second harmonic performance at high power;

3. B3 Duplexer

●Low insertion loss and high suppression: The company's B3 duplexer is developed based on the design of the filter, combining the low insertion loss and high out-of-band suppression of the filter chip;

● High isolation: The company's B3 duplexer can achieve an isolation of 55 dB, which meets the needs of the domestic market when the technology is "stuck". The isolation is greatly improved compared to the first version of the duplexer;

4. Core Team

The integrated circuit industry is known for its three intensive characteristics: technology-intensive, talent-intensive, and capital-intensive. At the same time, the research and development of the company's core product, BAW filters, also requires continuous iterations between design, process, and physical models to achieve the expected performance indicators. The company's core team is led by Dr. Yang Qinghua and is organized and built based on the above two dimensions. The members' professional expertise covers all relevant positions such as device research and development, process development, packaging and testing, and the organizational structure is reasonable. The core team comes from famous universities such as Tsinghua University, University of Science and Technology of China, and Shanghai Jiaotong University, as well as American universities. They have been deeply involved in the fields of integrated circuits and MEMS for more than 10 years, and have research and development and management experience in well-known overseas companies such as Avago, Skyworks, and Global Foundries, as well as top domestic research institutes and companies such as the Chinese Academy of Sciences, SMIC, ZTE Micro, and Spreadtrum. This year, the core team has successively won a number of talent awards such as Suzhou's "Gusu Leading" Major Innovation Team, Suzhou's Top Talents (Teams), and Jiangsu Province's Major Leading Talents in Double Innovation. The company has completed the cultivation of high-tech enterprises and has won the qualification of high-tech enterprises; and has successively won the 15th "China Core" Excellent Technology Innovation Products, Jiangsu Private Technology Enterprises and other awards.

V. Company development direction and development goals

1. Company development direction - all-round layout, committed to domestic substitution

(1) In view of the urgent need for the new generation of wireless communications to beautify high-frequency working bands and high-performance RF filter chips, one of the future directions is to develop and mass-produce RF filter chips for higher frequency bands. Based on the company's accumulated experience in the design and manufacturing of BAW filters, the company will carry out the research and development and industrialization of smaller-sized duplexers and multiplexers with high isolation and high insertion loss, as well as higher-frequency band filters, which are urgently needed for the high-frequency band RF front-end.

(2) RF front-end solution integration: Develop an integrated RF front-end solution through independent research and development or mergers and acquisitions of technical teams, integrating the power amplifier (PA), filter, switch and even low-noise amplifier (LNA) into a module, greatly reducing the development cycle of downstream customers and achieving further miniaturization and cost reduction of devices.

(3) Based on the accumulated process foundation and R&D capabilities, we will simultaneously carry out R&D of MEMS communication chips and modules with large-scale applications in 5G mobile communications, the Internet of Things, automotive electronics, autonomous driving, and artificial intelligence.

(4) Create a mature CIDM model that is independent and controllable through continuous development and accumulation of technologies, products, and processes.

2. Company development goal: to build a domestically produced safe alternative industrial chain system

■Short-term goals

● Technology and products: Update the performance of existing filter chip products and expand their application fields; focus on developing high-frequency, ultra-high-frequency, large-bandwidth RF filter chips and high-performance mid- and high-frequency band RF duplexer and multiplexer chips for 5G application scenarios;

● R&D line construction: Prepare to build a proprietary and dedicated 8-inch BAW filter R&D line; through this R&D line, conduct completely independent design and process R&D, and then introduce mass production in the foundry, that is, the dual-drive mode of self-owned Fab R&D + Foundry mass production, forming a relatively complete R&D and industrialization system, shortening the R&D cycle;

● Sales target: The company aims to become the most competitive domestic RF filter chip supplier. Its products will cover all medium/high/ultra-high frequency bands required for 4G/5G. Currently, the company's products have entered the supply chain of mobile terminal, Internet of Things and other product suppliers. In the future, the company's products will enter various RF communication fields such as communication base stations, wearable devices, smart homes, Internet of Vehicles, aerospace, etc., to further support the development of ubiquitous wireless communication technology.

● Talent introduction: In order to continuously improve the company's core technology research capabilities, based on the company's existing core R&D team members, in accordance with international advanced concepts and standards, vigorously introduce a group of high-level talents from home and abroad, establish a high-level R&D team, and cultivate a group of outstanding R&D technical backbones; it is planned that the number of personnel with doctoral degrees and senior engineers will account for 10%, and the number of personnel with a master's degree or above will account for more than 30%;

●Intellectual property: The company will increase R&D investment on the basis of mass production of products, encourage employees to innovate independently, conduct research on key technologies of BAW filters and integrated RF modules and achieve effective breakthroughs. Core patents will cover various fields such as circuits, design, processing and manufacturing, packaging and testing, etc., providing technical reserves for the country's high-end chip manufacturing, and at the same time providing guarantees for the industrialization of high-performance BAW filters.

■Medium and long-term goals

According to the company's product layout and business plan, we will strive to complete the IPO within 5 years and form a complete layout of RF front-end chips and modules. Through independent research and development and mergers and acquisitions, we will complete the layout of single products or integrated modules of RF front-end including filters, antennas, power amplifiers, low noise amplifiers and RF switches. Based on the accumulated rich process foundation and R&D capabilities, we will also carry out the research and development of communication chips and modules with large-scale applications in the fields of 5G mobile communications, the Internet of Things, automotive electronics, autonomous driving and artificial intelligence. Ultimately, we will create a domestic top and internationally competitive RF chip and MEMS smart sensing chip supplier.

As one of the core components of the 5G industry, the successful development of localized filter chips can fill the gap in my country's supply chain in the 4G/5G communication industry, drive the domestic design and manufacturing capabilities of RF core filters to quickly catch up with the international most advanced level, meet the domestic market's urgent demand for high-performance filters, and completely change the current situation of my country's long-term dependence on imports in this field. It will lay a solid scientific and industrial foundation for the upgrading and development of current high-end MEMS chip core technologies, and while creating good economic benefits, it will contribute to the key links in the country's construction of an information security system and enhance my country's voice in the 5G industry.

Reasons to vote for this team:

1. Introduction to the Manager

Yang Qinghua, founder of Hantianxia, ​​holds an undergraduate degree from Tsinghua University, a doctorate from the Institute of Microelectronics of the Chinese Academy of Sciences, a professor-level senior engineer, and an adjunct professor at Beijing University of Posts and Telecommunications. He is a leading talent in the National "Ten Thousand Talents Program" and enjoys a special allowance from the State Council. He has won dozens of national and other honors at all levels, including the title of "Young and Middle-aged Expert with Outstanding Contributions" in the National Hundred, Thousand and Ten Thousand Talents Project, the National "Innovation Talent Promotion Plan" Science and Technology Innovation and Entrepreneurship Talent, Suzhou Top Talent (Team), and Suzhou Industrial Park "Major Leading Talent". At the same time, he also serves as a number of social positions such as an expert in the Ministry of Science and Technology. He has a solid theoretical foundation in microelectronics, as well as a deep understanding of the semiconductor industry and the ability to judge the market. He has undertaken and participated in the research and development of more than 10 national projects such as the National 02 Special Project, published more than 10 papers, 6 of which are first authors, and has more than 60 intellectual property rights. The core basic theories he proposed are included in the industry's top international journals such as IEEE Transactions on Microwave Theory and Techniques and IEEE Transactions on Circuits and Systems. In 2012, he led the power amplifier (PA) team to overcome the technical difficulties of CMOS in the RF field, and successfully developed the first and only CMOS PA chip in China at that time. The cumulative shipments exceeded 3.5 billion pieces, and it won many provincial and ministerial awards including the Beijing Science and Technology Award.

2. Managers’ performance results: tackle core technologies, break international monopolies, and achieve domestic substitution

In 2015, with the approach of 5G applications, the complexity of RF front-end modules gradually increased, which brought many challenges to the design of mobile terminal RF front-ends, especially the filter market, which has been monopolized by foreign giants and has long been controlled by others. However, the design and process of filter chips are complex, and the technical barriers are high. Domestic filter companies have insufficient technology and process accumulation, and there are only a limited number of manufacturers that can enter the filter market. To this end, Dr. Yang Qinghua began to actively plan R&D routes, integrate high-quality resources, and seek partners. In the same year, he established Guizhou Zhongke Hantianxia Microelectronics Co., Ltd. and officially started the research and development of RF filters.

Over the past few years, Dr. Yang Qinghua has led his team to overcome the key processes of the entire BAW process and systematically master the relationship between the structure and performance parameters of RF filter devices. The core technology is completely independent and self-developed, and innovatively integrates multiple technologies such as piezoelectric effect, inertial mass load effect, deposition technology of high c-axis oriented AlN piezoelectric film, and boundary microstructure control of lateral acoustic wave leakage technology. It has successfully achieved technological innovation and transformation of scientific and technological achievements in circuit design, efficient extraction of acoustic and electrical parameters under longitudinal wave mode, resonator unit manufacturing, packaging testing, and layout design. The resonator quality factor has been greatly improved, and the international mainstream 1.1mm*0.9mm small package can be achieved. It is breaking through ultra-small packaging, and the technology has reached the top domestic level. Two high-frequency band products have entered large-scale mass production, and two extremely complex products have been sent to customers for sampling. More than 70 customers have been supplied in total, and the core products have won the "Hardcore China Core" Best RF Chip Award and the "China Core" Excellent Technology Innovation Product Award. In November 2020, the monthly shipment volume exceeded 10 million units, ranking first in the domestic market. As of 2021, the cumulative shipments have exceeded 120 million units.

3. Work hard on internal strength and attach importance to talents and patents

Faced with the huge impact of the pandemic and the uncertainty of the international situation in the past year, Hantianxia's response strategy is to "prepare enough food and grass for the winter and practice basic internal skills." In view of the fact that integrated circuit companies are talent- and technology-intensive, Hantianxia has made careful arrangements.

Hantianxia has recruited a large number of outstanding talents for the company through various channels and methods, and through a fair and transparent internal rating and promotion system, it has motivated and empowered outstanding employees in various positions to enhance the company's core competitiveness. Since its establishment, Hantianxia has trained a large number of outstanding engineers who are proficient in the design and development, process implementation and test verification of bulk acoustic wave resonators, master the relationship between the design and manufacturing of key structures of BAW filter devices and device performance, and are familiar with the collaborative communication with process teams such as tapeout and packaging. This has enabled Hantianxia to have the ability of research and development, pilot production and small-batch production, and has carried out in-depth strategic cooperation with the top domestic first-class foundries, completing the process from laboratory scientific research experiments to large-scale repeated production and product sales in factories.

As a leading company in the RF field, Hantianxia has established a professional intellectual property department to safeguard the company's intellectual property and patented technologies from multiple aspects such as patent protection and risk prevention and control. At the same time, the company has established a mature patent reward mechanism to stimulate the innovative power of talents from multiple angles and provide effective support and protection. Up to now, Hantianxia has applied for nearly 100 intellectual property rights, successfully breaking through the technological monopoly and patent blockade imposed by developed countries on my country. Many patents have been directly applied to products and have achieved significant economic and social benefits.

4. Perfect our core and help the world

Dr. Yang Qinghua is a rare expert in scientific and technological innovation in the industry. He has the professional knowledge background of a professor-level senior engineer and rich entrepreneurial experience. He has rich scientific research experience in the field of RF front-end and strong market development and management capabilities. Under the leadership of Dr. Yang Qinghua, the company has a good operating status and growth potential, its products have core competitiveness, and it has a relatively complete scientific research platform. Dr. Yang Qinghua has formulated a clear technical development direction and business model for the company, and organized and built a technical R&D team with high professional and technical level and rich R&D experience. The team members have a reasonable professional structure, close open cooperation, and remarkable achievements in the combination of industry, academia and research. They have independent intellectual property rights and technologies, have formed a large production scale, and are in a leading position in China.

The scientific research results achieved by Dr. Yang Qinghua in the field of RF front-end have solved the pain points of my country's RF front-end chips being controlled by others and heavily dependent on imports. Independent and controllable products will provide effective guarantees for localization and independent brands, fill the gap in my country's 4G/5G communication industry supply chain, and drive the design and manufacturing capabilities of domestic RF core filters to quickly catch up with the international most advanced level, meet the domestic market's urgent demand for high-performance filters, and completely change the current situation of my country's long-term dependence on imports in this field. It will lay a solid scientific and industrial foundation for the upgrading and development of current high-end MEMS chip core technologies, and while creating good economic benefits, it will contribute to the key links in the country's construction of an information security system and enhance my country's voice in the 5G industry.

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