基于二元偶极子阵的边射端射可重构RFID阅读器天线设计

A Pattern Reconfigurable RFID Reader Antenna with Broadside and Bidirectional Endfire Patterns Based on Binary Dipole Array

基于射频识别应用场景中存在的一些T型结构,如楼内、地下矿井等存在的一些T型通道,为做好这些场景中的信号覆盖,本文提出了一种新颖的边射端射可重构的RFID阅读器天线。天线由可重构的馈电网络和两个相距半波长的偶极子组成,天线边射和双向端射的可重构特性通过控制馈电网络中的开关状态实现。为了验证天线性能,对其进行了加工测试。测试结果表明,天线在边射和端射状态下的阻抗带宽和增益分别为2.7%(900~925 MHz),4.15 dBi和1.9%(905~923 MHz),2.10 dBi,与仿真结果基本一致。该天线具有结构简单、小型化、低剖面等优势,在射频识别系统中有一定的应用价值。

Based on some T-type structures existing in the application scenarios of radio frequency identification(RFID),such as T-type channels existing in buildings and underground mines,in order to make good signal coverage in these scenarios,a novel pattern reconfigurable RFID reader antenna is proposed in this paper.The antenna consists of two half-wave dipoles separated by half a wavelength and a reconfigurable feeding network.The reconfigurability of the broadside pattern and bidirectional endfire pattern is realized by controlling switching diodes.For verification,the designed reconfigurable antenna is fabricated and measured.The measured bandwidth for 10 dB return loss and peak gain in broadside pattern and endfire pattern are 2.7%(900-925 MHz),4.15 dBi,and 1.9%(905-923 MHz),2.10 dBi,respectively,which are in good agreement with the simulated ones.Besides,the proposed antenna has obvious advantages in miniaturization,low profile and simple structure,which benefit its potential applications.