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This Letter proposes a miniaturised filter that makes use of quarter-mode substrate-integrated waveguide (QMSIW) combining with a comb-line architecture for the first time. The comb-line QMSIW filter uses a periodic structure of distributed capacitance thereby reducing the size of the conventional QMSIW filter. To enhance out-of-band rejection, an S-shaped slot is introduced to realise negative coupling...
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