提出了一种过模基片集成波导(SIW)腔体滤波器。介绍了只由单个过模SIW腔体构成的一阶滤波器的原理。利用过模SIW腔体中的基模实现模式交叉耦合,滤波器能产生一个位于通带任一边的传输零点(TZ)。设计了一个由两个过模SIW腔体级联成的二阶滤波器,该滤波器能产生两个传输零点。为了改善滤波器的阻带性能,使用了非相似谐振器技术来实现寄生抑制。此外,阻带性能也可以通过增加基模谐振器的数量来改善。设计并制造了含有两个过模SIW腔体的二阶和三阶滤波器,仿真与测试结果吻合。 An over mold base integrated waveguide (SIW) cavity filter is proposed. The principle of a first-order filter consisting of a single over-mode SIW cavity is introduced. Mode cross-coupling is achieved with a fundamental mode in an over-molded SIW cavity, and the filter produces a transmission zero (TZ) on either side of the pass band. A second-order filter cascaded by two over-mode SIW cavities is designed, which produces two transmission zeros. In order to improve the stop-band performance of the filter, parasitic suppression is implemented using non-similar resonator techniques. In addition, stopband performance can also be improved by increasing the number of fundamental mode resonators. The second and third order filters with two over-mode SIW cavities are designed and fabricated. The simulation and test results are in good agreement.