一种应用于RFID 的印刷倒F 天线设计

A Design of Printed Inverted-F Antenna for RFID

摘要: 基于平面倒F 天线模型，设计了一种用于2.4GHz RFID 系统的印刷倒F 单极子天线。采用易于射频集成的微带馈电方式，并结合带线阻抗变换，以实现较宽的阻抗带宽；采用在印刷倒F 结构正上方加载寄生辐射贴片，以提高天线增益。利用高频电磁仿真软件Ansoft HFSS 对提出的天线进行了建模、仿真和优化设计，该天线在2.28-2.51GHz 频率范围内VSWR＜2，达到了10%左右的阻抗带宽，特别在RFID 系统的工作频段内（2.401GHz~2.409GHz）VSWR＜1.35, 增益＞2.36dBi。该天线具有尺寸小，重量轻，成本低等众多优点，能应用于工作于2.4GHz 的各种RFID 系统中。

Abstract: A printed inverted-F monopole antenna is designed for Radio Frequency Identification in this paper.Microstrip line is used in the proposed antenna for easy compositiving in RF circuit, and also impedance transform is appliedfor achieving wide impedance bandwidth. A parasitic patch is added just at the top of the presented antenna for gainenhencing.After be modeled, simulated and optimized in this paper, The presented antenna operates well impedance bandwidth of 2.28~2.51GHz for VSWR＜2,about 10 percent relative bandwidth. For the use of RFID system,the antennaachieves VSWR＜1.35 at 2.401GHz~2.409GHz, and gain value ＞2.36dBi. The designed antenna has advantages of smallsize, light weight and low price for wide using in RFID systems operating at 2.4GHz.