小型化宽频带圆极化半圆形微带贴片天线

Miniature Broadband Circularly-polarized Half-circular Microstrip Patch Antenna

针对无线通信中单贴片圆极化微带贴片天线带宽很窄的问题,提出了小型化半圆形宽频带圆极化微带天线。该天线通过在半圆形辐射贴片上开一组尺寸和位置非对称的矩形槽实现圆极化,应用非共面的临近耦合馈电补偿馈电探针的电感展宽天线的带宽。仿真结果表明,在2.30~3.04GHz范围内,天线的回波损耗小于-10dB,阻抗带宽27.7%;在2.37~2.54GHz范围内,天线的轴比小于3dB,圆极化带宽6.9%;在宽带范围内天线的增益大于6dB。与圆极化E形微带天线相比,不仅提高了带宽,而且贴片面积缩小了40%。

In view of the narrow bandwidth of single patch circular polarization microstrip patch antennas in wireless communications,a broadband circularly-polarized miniature half-circular microstrip antenna was proposed in this paper.By cutting apair of size and location asymmetrical rectangular slits on a half circular radiating patch,the circular polarization was achieved.The bandwidth was widened by non-coplanar proximity feeding to compensate for the inductance of the feeding probe.Simulation results showed that,within 2.30~3.04 GHz,the return loss was less than-10 dB and the impedance bandwidth was 27.7%.The axial ratio was lower than 3 dB in a bandwidth of 2.37~2.54 GHz and the circular polarization bandwidth was 6.9%.The power gain was above 6 dB within the wide bandwidth.Compared with E-shaped patch antenna of circular polarization,not only the bandwidths were enhanced,but also the antenna got 40% patch area reduction.