Substrate Integrated Waveguide Quasi-Elliptic Filters With Controllable Electric and Magnetic Mixed Coupling
Substrate Integrated Waveguide Quasi-Elliptic Filters With Controllable Electric and Magnetic Mixed Coupling
复制标题
DOI：
10.1109/tmtt.2012.2209437
复制
发表时间：
2012-08
影响因子：
4.3
通讯作者：
Ke Gong;W. Hong;Yan Zhang;Peng Chen;Chang-Jiang You
中科院分区：
文献类型：
--
作者：
Ke Gong;W. Hong;Yan Zhang;Peng Chen;Chang-Jiang You
提出了一种基于基片集成波导谐振腔的可控电磁混合耦合准椭圆滤波器。对于二阶混合耦合滤波器，通过在两个腔体之间嵌入短端带状线和传统的电感窗口来实现混合耦合，通过调节带状线和电感窗口的宽度可以分别控制电耦合和磁耦合，并在通带以下或通带以上产生可控的传输零点。针对本地多点分布业务应用，设计、仿真并制作了Ka波段三个直接耦合准椭圆滤波器和两个交叉耦合准椭圆滤波器，采用混合电磁耦合二阶滤波单元。对于N阶滤波器，最多可以实现N-1个有限传输零点。该滤波器具有选择性好、传输零点可控、上阻带宽、易于与其它平面电路集成等优点。实验结果与模拟结果吻合较好。
This paper proposes a type of quasi-elliptic filter with controllable electric and magnetic mixed coupling based on substrate integrated waveguide cavity resonators using two-layer printed circuit board process. For the second-order mixed coupling filter, an embedded short-ended strip line is combined with a conventional inductive window between two cavities to create the mixed coupling, in which the electric and magnetic coupling can be separately controlled by adjusting the width of the strip line and the inductive window, and a controllable transmission zero can be produced below or above the passband. For local multipoint distribution service application, three directly coupled quasi-elliptic filters and two cross-coupled quasi-elliptic filters are designed, simulated, and fabricated using the mixed electric and magnetic coupling second-order filtering units at the Ka-band. For the N-order filter, a maximum of N-1 finite transmission zeros can be realized. The proposed filters show the advantages of good selectivity with controlled transmission zeros, wide upper stopband, and easy integration with other planar circuits. Good agreements have been observed between the measured results and the simulated ones.