Ka波段宽带H型缝隙耦合蝶形微带贴片天线设计

Design of Wideband H-type Aperture-Coupled Butterfly Microstrip Patch Antenna at Ka-Band

本文采用H形缝隙耦合馈电,并引入蝶形贴片和背腔结构,设计了一款适用于Ka波段,具有良好波束前后比特性的宽带缝隙耦合天线。通过用蝶形贴片代替传统的矩形贴片,引入新的谐振点,大大扩展了天线带宽;背腔结构的引入在有效抑制天线后向辐射的同时也增加了天线的最大增益,明显提高了天线辐射前后比。利用HFSS仿真后得到的结果:在35GHz时天线的最大增益为6.9dB,方向图前后比达到24.3dB,反射损耗小于-10dB的相对带宽为30%(29.3-39.8GHz)。

A wideband,high front-to-back ratio aperture-coupled antenna at Ka band is designed with H shape aperture,cavity structure and butterfly microstrip patch in this paper.A new resonance point has been introduced to expand the antenna bandwidth greatly by using the butterfly patches instead of the traditional rectangular patch; a cavity structure also has beenintroduced to increase front-to-back ratio by restraining radiation behind antenna,the maximum gain can also be increased.Simulation results show while the fractional bandwidth of-10 dB return loss is 30%,from 29.3 GHz to 39.8 GHz.The front-to-back ratio is 24.3 dB,and the absolute gain is 6.9 dB at 35 GHz.