摘要
设计了一个四阶基片集成波导滤波器,采用HFSS软件优化谐振腔尺寸、耦合窗宽度,以获得良好的性能。为了抑制由高次模引起的寄生通带,提高阻带性能,腔与腔之间采用双耦合窗进行能量耦合,有效地抑制了TE301模式的传输。设计好的滤波器在单层PCB基片上进行制作。测试结果表明滤波器的中心频率为20 GHz,带宽为600 MHz,通带内最小插损为1.8d B,反射系数优于-15 d B。由于高次模被抑制,滤波器阻带内的第1次有效寄生通带出现在约38 GHz处。滤波器实测结果与仿真结果具有较高的吻合度。
A four-order substrate integrated waveguide filter is designed. The HFSS software is usedto optimize the sizes of cavities and the widths of coupling irises to obtain good performance. In orderto suppress the spurious passband caused by higher？order modes, and to improve the stop？band per？formance, the double coupling irises between cavities are adopted to couple the energy, which effec？tively suppress the transmission of the TE301 mode. The designed filter is fabricated on a single？layerPCB substrate. The test results indicate that the center frequency of the filter is 20 GHz, with thebandwidth of 600 MHz. In the passband, the minimum insertion loss is about 1.8 dB, the reflectioncoefficient is better than ？15 dB. The first spurious passband appears at about 38 GHz in the stop？band due to the suppression of higher？order modes. The measurement matches well with the simula？tion.
出处
《雷达与对抗》
2017年第4期40-43,共4页
Radar & ECM
关键词
滤波器
基片集成波导
高次模抑制
filter
substrate integrated waveguide （SIW）
higher-order modes rejection
