摘要
设计了一款工作在超高频的小型圆极化射频识别微带天线。天线的辐射贴片是边长都为阶梯状的四边形。通过贴片的两个矩形槽实现天线的圆极化,并且能有效减小贴片的尺寸,调整两个槽的角度和长度可以控制天线的圆极化性能。通过调整贴片中心圆形槽的大小可以实现天线的良好匹配。天线的仿真结果表明:在920~925MHz频带范围内,回波损耗小于-20dB,轴比均在3dB以下,增益大于8dBi。加工出天线实物,天线的实测结果与仿真结果吻合良好。
In this paper,a miniaturized,circular polarized(CP) microstrip antenna for UHF Radio Frequency Identification(RFID) system is presented.The radiation patch of the antenna is quadrangular whose sides are all ladder like.The two rectangular slots on the patch can realize the CP operation and reduce the size of the patch.And the CP performance of this antenna can be controlled by adjusting the angle and the length of the two slots.A well impedance matching can also be achieved by adjusting the dimension of the circular slot etched in the center of the patch.The simulated results show that the return loss of this antenna is less than- 20dB,the axial-ratio(AR) less than 3dB,and the gain more than 8dBi at the working frequencies 920 ~ 925 MHz.The measured results are in agreement with the simulated results.
出处
《微波学报》
CSCD
北大核心
2015年第1期36-39,43,共5页
Journal of Microwaves
关键词
射频识别(RFID)
小型化
圆极化
微带天线
radio frequency identification(RFID),miniaturized,circular polarized,microstrip antenna
