基于RFID应用的频率可调天线设计

Frequency Adjustable Antenna Design Based on RFID Application

针对RFID技术应用,没有统一的国际化标准,不同国家有不同的频段标准,这使得RFID技术的广泛应用变得困难。结合弯折偶极子天线和阿基米德螺旋天线的特点设计出一款新型的标签天线,它是由2个方形的螺旋臂加上2个调谐臂组成,通过改变2个调谐臂之间的相对距离(0~38 mm),可以实现谐振频率在840~860 MHz之间改变,因而能够应用于不同国家的RFID频段标准,而且在改变谐振频率的过程中能够保证带宽在40 d B左右,平均增益在1.726 65 dBi。

Since there is no unified international standard for RFID technology, and different countries use different frequency bands,the wide application of RFID technology around the world faces a big challenge.In this paper,a novel tag antenna is designed by combining the characteristics of folded dipole antenna and Archimedean spiral antenna, lt is composed of two rectangular spiral arms with two tuning arms,and by adjusting the relative distance （0-38 mm） between the two tuning arms, the resonant frequency can be changed from 840 MHz to 860 MHz,so it is adaptable to different countries＇ RFID band standards.Furthermore,it can guarantee a band- width of about 40 dB and an average gain of 1.726 65 dBi in the process of changing resonant frequency.