| 摘要 |
<p>An RFID reader is provided to realize a multi-band structure accepting various frequency types/specifications and realize a signal processing structure capable of stably keeping a recognition ratio by using a plurality of antennas. A plurality of phase shifters(122) are connected to the plurality of antennas(110) and have a different phase difference, respectively. An RF processor is equipped with a switch(124) connected to the phase shifters and enabling the phase shifters to sequentially conduct with one transmission path individually or in a group. The RF processor is equipped with a band pass filter(126) connected to the switch and an RFID receiver(100) including a low noise amplifier(128) connected to the filter. A controller(140) transfers a switching control signal to the switch. The switching control signal includes more than one of switching cycle and sequence information.</p> |
