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高阻表面光子晶体是一种周期性介质结构,具有抑制表面波的特性。借助Rsoft bandsolve设计了一种带隙中心频率位于11.75 GHz左右的正方形单元高阻表面结构,有效带隙区间为0.50989~0.57987,带隙率为12.5%。将其应用于E形微带天线上,利用专业三维电磁仿真软件Ansoft HFSS对高阻表面微波光子晶体微带天线性能进行了整体仿真分析,采用热转印法完成了两种天线的制备,搭建测试系统测试了加载高阻表面光子晶体前后天线的回波损耗及功率,基于相关理论知识,计算出所设计天线的实际增益。结果表明,加载高阻表面光子晶体使得微带天线增益增加了1.56 d B,低背瓣辐射最大可以降低10 d B,改善了天线方向性,增强微带天线整体性能。
High-resistance surface photonic crystal is a periodic medium structure that has the property of suppressing surface waves. A Rsoft bandsolve designed a square cell high resistance surface structure with a bandgap center frequency around 11.75 GHz with an effective bandgap range of 0.50989 ~ 0.57987 and a bandgap ratio of 12.5%. Applying this technology to the E-shaped microstrip antenna, the overall performance of the high-impedance microwave photonic crystal microstrip antenna was simulated by the Ansoft HFSS, a professional three-dimensional electromagnetic simulation software. The two antennas were fabricated by thermal transfer method. The test system tests the return loss and power of the antenna before and after loading the high-resistance surface photonic crystal. Based on the relevant theoretical knowledge, the actual gain of the designed antenna is calculated. The results show that the loading of high-resistance surface photonic crystals can increase the gain of the microstrip antenna by 1.56 d B and reduce the radiation of the low back-flap by 10 d B at the maximum, which improves the antenna directivity and enhances the overall performance of the microstrip antenna.