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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)。
In this paper, a H-shaped slot coupling feed is introduced and a butterfly patch and a back cavity structure are introduced. A broadband slot coupling antenna with Ka-band and good front to back beam characteristics is designed. By replacing the traditional rectangular patch with a butterfly patch and introducing a new resonance point, the antenna bandwidth is greatly expanded. The introduction of the back cavity structure effectively restrains the backward radiation of the antenna and increases the maximum gain of the antenna, Antenna radiation before and after than. The results obtained with HFSS simulation show that the maximum gain of the antenna is 6.9 dB at 35 GHz, the front-to-back ratio is 24.3 dB, and the relative bandwidth of reflection loss less than -10 dB is 30% (29.3-39.8 GHz).