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The contribution of this work is to propose novel balanced bandpass filters (BPFs) using the half-mode substrate integrated waveguide (HMSIW) and its size-reduced form, a folded HMSIW structure. The size of an HMSIW is about half of the substrate integrated waveguide (SIW) and the size of the folded HMSIW further reduces to 25%. Besides compactness, the proposed BPFs are attractive because the thru-via...
In this paper, bandstop filters of suspended stripline are proposed. The filters are a ladder circuit structure which has the shunt-circuit modules in the series branches and the series-circuit ones in the ladder's shunt arms. Each of these individual modules provides a transmission zero whose frequency can be independently tuned. Two bandstop filters are built from utilizing three and five of these...
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