具有谐波抑制功能的圆极化整流天线设计

摘要

设计了一款新型的具有谐波抑制能力的圆极化整流天线。在圆环缝隙天线的中心挖圆形孔,控制天线的谐振频带与抑制高次谐波。在缝隙的内边缘开两个半圆形槽,缩减天线的尺寸并获得圆极化辐射。倍压整流电路有效地提高了整流天线的输出直流电压。仿真结构表明,天线谐振带宽( VSWR<2)为17.6%,圆极化带宽( AR<3 dB )达到3.7%。整流电路在0 dBm的输入功率时,能达到59%的整流效率和1.7 V的直流输出电压。该整流天线可作为无源射频识别( Radio Frequency Identification,RFID)标签的整流天线。%A novel circular polarization rectifying antenna ( rectenna) with harmonic suppression is presen-ted and designed in this paper. To control the resonant frequency band and suppress high-order harmon-ics, a round hole is dug in the center of the ring-slot antenna. Two semicircular grooves are opened on the inner edge of the slot to reduce the antenna size and create circularly polarization. The voltage-doubler rectifier circuit effectively improves output DC voltage of the rectenna. Simulation results show that the res-onant bandwidth (VSWR<2) of the antenna is 17. 6%and circularly polarized bandwidth (AR<3dB) up to 3 . 7%. The rectifying efficiency can reach 59% and DC output voltage 1 . 7 V when the rectifier circuit has 0dBm input power. The rectenna can be used as the rectifying antenna of passive radio frequency iden-tification ( RFID) tag.