A half‐mode substrate integrated waveguide filtering power divider with Fourier‐varying via holes

Abstract

AbstractIn this article, a novel design methodology of a half‐mode substrate integrated waveguide (HM‐SIW) filtering Wilkinson power divider is proposed. The width between the two metallic rows of vias in the conventional HM‐SIW divider is governed by a truncated Fourier series expansion to obtain specific passband/stopband performance. The optimized varying width is obtained using the even‐mode analysis, whereas the odd‐mode analysis is used to find the optimum values of three isolation resistors that achieve acceptable isolation and output ports matching over specific frequency range. For validation, a HM‐SIW divider with a center frequency of 12.3 GHz and 3.7% 10‐dB fractional bandwidth is designed, simulated, and measured. Simulated and measured results show a good agreement with passband return loss and transmission losses better than −15 and −3.0 dB, respectively.