椭圆函数低通滤波器在机载天线中的应用

Application of elliptical function low⁃pass filter in airborne antenna

以椭圆函数低通滤波器为原型,建立不同形式的宽带低通滤波器,通过HFSS软件对滤波器进行仿真分析。采用不同切向形式工艺降低装配误差对高次模的影响,并通过实际测试数据验证仿真结果的一致性。最终将两种不同形式的滤波器应用于机载天线系统进行业务测试,通过性能及数据对比,选择了一种更适合机载天线系统的宽带低通滤波器,收发隔离度达90 dB以上,为验证滤波器在机载天线中的应用提供了一些思路。

Different forms of broadband low-pass filters are established based on elliptic function low-pass filter.The filters are simulated and analyzed with HFSS.Different tangential processes are adopted to reduce the impact of assembly errors on higher-order modes.The consistency of simulation results are verified by actual test data.Two different forms of filters are finally applied to airborne antenna systems for business testing.After the performance and data comparison,a broadband low-pass filter that is more suitable for airborne antenna systems is selected,and its transmission and reception isolation degree is more than 90 dB,which provides some ideas for verifying the application of filters in airborne antennas.