In order to realize microwave power supply for low-power loads, a microstrip rectenna for 2.45 GHz is designed. In the design of the receiving antenna, a photonic crystal (PBG) structure is introduced to improve the gain and directivity of the receiving antenna; a defective ground type (DGS) structure is introduced in the low-pass filter part to achieve the 2.8 GHz low-pass filter characteristics with a relatively simple structure; finally, the matching circuit between the microstrip transmission line and the rectifier diode is obtained through the ADS software design. The three parts of the microstrip circuit, the receiving antenna, the low-pass filter and the rectifier circuit, are integrated to complete the design of the rectenna. Through experimental tests, the gain of the rectenna is 4.29 dBi and the maximum rectification efficiency is 63%. By introducing the photonic crystal structure and the defective ground type structure, the size of the antenna is effectively reduced and the design method is simplified on the basis of ensuring the gain and rectification efficiency of the rectenna.
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