Abstract

JOHNSON, Leanne; MEYER, Petrie  and  MEYER, Elmine. Pedestal Substrate Integrated Waveguide filter with both electric and magnetic cross-couplings. SAIEE ARJ [online]. 2020, vol.111, n.1, pp.36-43. ISSN 1991-1696.

In this paper, the recently proposed Pedestal Substrate Integrated Waveguide (SIW) structure, consisting of evanescent-mode SIW cavities, loaded with pedestal-shaped metal inserts, is utilized to design a coupled resonator filter with both positive and negative cross-coupling. It is shown that both types of coupling, for a large range of coupling values for both, can very simply be implemented in this structure, with electric coupling obtained by means of an I-shaped strip_line between pedestal tops, and magnetic coupling obtained using inductive irises. The proposed structure can also introduce mixed coupling. Graphs are presented to show the range of coupling values attainable. A proof-of-concept sixth order cross-coupled bandpass filter, with a 5 % bandwidth at 5 GHz, and both real and imaginary axis transmission zeros, are designed and measured.

Keywords : Electric coupling; magnetic coupling; mixed coupling; substrate integrated waveguide; cross coupling; pedestal resonator.

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