HF RFID Multi Antenna Circuits of HF RFID Reader

摘要

The present invention relates to a multi-antenna circuit, which comprises: a matching circuit unit connected between a high-frequency signal terminal and a plurality of antennas to match a high-frequency signal; and a selection circuit unit connected between the matching circuit unit and the plurality of antennas to sequentially connect one antenna, responding to an antenna selection signal and selected among the plurality of antennas, to the matching circuit unit. Therefore, the selection circuit unit forms a closed circuit between the selected antenna and the matching circuit unit, and can prevent inductive interference between closely arranged antennas by keeping the remaining unselected antennas in an isolation state with the matching circuit unit.