应用于RFID的小型化双频微带天线的设计与分析

Design and Analysis of a Small Dual-Frequency Microstrip Antenna for RFID

提出了一种适用于射频识别手持读写器的双频单层微带天线新颖设计,适用于超高频频段(920～925MHz)和ISM频段(2.4～2.5GHz)的射频识别系统。切四角和中心方形结合缝隙结构,实现了天线的小型化设计,满足了天线设计要求,选用廉价FR4板材尺寸为75mm×75mm×3mm。给出了天线设计思路,并利用电磁仿真软件分析了天线性能,仿真与测试结果吻合良好。天线测试结果表明:在917.1～936.5MHz频带范围内回波损耗小于15dB,在2.43～2.47GHz频段内小于-15dB;在UHF频段与ISM频段内,读写器天线的最大增益为0.02dBi和1.66dBi,所以本天线能满足我国射频识别读写器的应用要求,具有良好的应用前景。

This paper presents a novel dual-band single-layer substrate hand-held reader＇ s anernna. The proposed an- tenna operates at UHF band （ from 920 - 925 MHz） and ISM band （ 2.4 - 2.5 GHz ） , which is suitable for RFID application. Cutting down corners and center square combined with slot structure realizes a miniaturization of antenna design and meets the requirements. The antenna uses cheap FR4 substrates and 75mm×75mm×3mm size. This paper gives the antenna design i- deas, and using the electromagnetic simulation software analyzes the performance, simulation results are compared with the measurements, and a good agreement is obtained. The measurements show that the antenna＇ s return loss is less than -15dB at 917.1 -936.5MHz, 2.43 -2.47GHz, and a gain level of about 0.02dBi and 1.66dBi respectively. Therefore, the pro- posed antenna can be a good candidate for China RFID readers/writers operating at 920MHz and 2.45GHz.