In order to realize the switching of UHF RFID dense antennas, it is necessary to transmit three signals, namely control signal, power supply and 900 MHz radio frequency signal, between the switching circuits. The traditional method requires three cables to transmit the three signals respectively. The switching circuit uses a combination of simple devices such as MCU, transistors, resistors, capacitors, etc. to complete the synthesis and separation of the three signals. The MCU is used to check the access antenna status and antenna switching control of the antenna switching system. Thus, a relatively simple circuit is obtained, which realizes the transmission of three signals by one coaxial cable, making the connection of the entire system simple and reliable.
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