小型双频圆极化贴片天线

Compact Dual-Band Circularly Polarized Patch Antenna

本文提出了一种新型的小型双频圆极化贴片天线.通过在矩形贴片各边加载矩形槽产生扰动,在2.45GHz和5.04GHz频段内实现了圆极化性能,并通过调节各矩形槽的长度,实现阻抗带宽与3dB轴比带宽的匹配.天线采用同轴馈电,尺寸为0.218λ_0×0.211λ_0×0.013λ_0(λ_0为2.45GHz的自由空间波长).实测结果表明:天线圆极化工作带宽为1.26%(2.445~2.476GHz),0.92%(5.013~5.059GHz),各频段内的峰值增益分别为1.25dBi和1.32dBi.实测与仿真结果基本一致.

By loading rectangular slots at each edge of the rectangular patch for generating perturba- tion, the circular polarization was achieved in 2. 45 GHz and 5.04 GHz bands, respectively. Also, by adjusting the length of each rectangular slot, impedance and width was matched with the3-dB axial ratio band width. The size of antenna , which is feed by coaxial, is 0. 21820 × 0. 21120 × 0. 01320 （A0 is the wavelength at 2.45 GHz in free space）. Measured results show that the circular polarization operatinbandwidth of the antenna are 1.26% （2. 445-2. 476 GHz）, 0. 92% （5. 013-5. 059 GHz）, and the peak gain in two frequency bands are 1.25 dBi and 1.32 dBi, respectively. The measured results are in close agreement with the simulation results.