Abstract
This letter presents a multilayer approach for suppressing the higher order modes of substrate integrated waveguide (SIW) bandpass filters. Rectangular SIW resonators in multilayer substrates can be vertically coupled with magnetic and/or electric coupling by the proposed apertures etched on the middle metal layer. Harmonic passbands produced by the first higher-order mode $\text{TE}_{102}$ can be suppressed thanks to the proposed weak coupling or mixed coupling schemes in connection with the $\text{TE}_{102}$ mode. Compared with conventional horizontally coupled filter, the proposed filters also show a compact physical size. To demonstrate the proposed design method, two double-layered SIW bandpass filters Filter (I and II) are fabricated and measured. The experimental results show that the maximum rejection levels at the $\text{TE}_{102}$ mode frequencies are below −30 dB and −20 dB for Filter I and II, respectively. Furthermore, simulated and measured results also show a good agreement.
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