一种RFID密集天线切换电路的实现

为了实现UHF RFID密集天线切换,需要在切换电路之间传输控制信号、电源和900 MHz射频信号3种信号,采用传统做法需要3股电缆分别传输3种信号。切换电路利用MCU、晶体管、电阻、电容等简单器件的组合,可完成3种信号的合成和分离工作。通过MCU盘查天线切换系统的接入天线情况和天线切换控制。由此得到了一种较简单的电路,实现了一根同轴电缆传输3种信号,使整个系统连接简洁可靠。

A switch circuit of RFID dense antennas

For switching UHF RFID dense antennas,control signal,power and RF signal of 900 MHz are transmitted between some switch circuits.By tradition,three cables are respectively required to transmit the three signals.Our switch circuits utilize transistors,resistances,capacitances and so on,easily realizes the synthesizing and separation of the three signals.The MCU in the switch circuit makes an inventory of antennas and switches these antennas.A simple circuit uses a coaxial-cable to transmit all three signals together,so the connection of whole system is simple and reliability.