提出一种小型化的、谐振频率为2.45GHz的RFID标签天线的设计方法,标签天线被设计作为差分功率放大器(PA)的谐振电感.由于使用PCB偶极子天线代替两个片上的集成电感,总的放大器芯片面积降低到240μm×70μm.对该天线进行理论计算和实物测试,结果显示实物标签天线谐振频率为2.45GHz,PA工作于AB类型,供电电压为1.8V,输入信号频率为2.45GHz,在1dB压缩点处PA输出功率为8dBm.
A small 2.45 GHz radio frequency identification (RFID)tag antenna is presented. The RFID tag antenna is designed as a resonance inductance of the differential power amplifier (PA). The total PA chip area is reduced greatly to only 240 μm×70μm due to the fact that a printed circuit board (PCB) dipole antenna substitutes for the two on-chip integrated inductors. The proposed design methodology is verified by comparing the calculations and measurements, which show the tag antenna works at 2.45 GHz. Operating in Class-AB with a 1.8 V supply voltage and 2.45 GHz input signal, the PA shows an output power of 8 dBm at the 1 dB compression point.