一种低剖面圆极化微带阵列天线的设计

Design of a Low Profile Circular Polarization Microstrip Array Antenna

为了适应宽波束覆盖需求的圆极化天线,同时展宽微带天线的轴比带宽,提出了一种新的低剖面1×4圆极化微带阵列天线。天线阵列由四个微带贴片单元组成的直线阵列,通过改变每个辐射贴片单元的馈电方向,按照一定规律组合,单元合成时通过相互抵消、抑制,可以有效提高阻抗带宽以及轴比带宽。仿真和实测结果表明,该天线阵在0.79~0.96GHz回波损耗低于-15 dB,轴比小于3 dB。天线具有低剖面、结构简单、易于加工等特点,满足预期设计要求。

In order to adapt to the circular polarization antenna with wide beam coverage and broaden the axial ratio bandwidth of microstrip antenna,a new low profile 1×4 circular polarization microstrip array antenna.The antenna array is a linear array composed of four microstrip patch elements.By changing the feed direction of each radiation patch unit and combining according to a certain rule,the impedance bandwidth and axial ratio bandwidth can be effectively improved through mutual cancellation and suppression when the units are combined.The simulation and measurement results show that the return loss of the antenna array is less than-15 dB and the axial ratio is less than 3 dB at 0.79~0.96 GHz.The antenna has the characteristics of low profile,simple structure and easy processing,meeting the expected design requirements.