Smith, James NathanStander, Tinus2019-11-132019-11-132019-11Smith, J.N. & Stander, T. 2019, 'A capacitive SIW discontinuity for impedance matching', IEEE Transactions on Components, Packaging and Manufacturing Technology, vol. 9, no. 11, pp. 2257-2266.2156-3950 (print)2156-3985 (online)10.1109/TCPMT.2019.2946945http://hdl.handle.net/2263/72222We present a shunt capacitive substrate-integrated waveguide (SIW) discontinuity for the first time. The discontinuity is parametrically characterized in terms of its reactive impedance, and an equivalent circuit model is presented and validated. $C$ -band prototypes are manufactured and measured, confirming the simulated results. The utility of the discontinuity is then demonstrated as a part of a matching network for an $S$ -band amplifier. A simple synthesis method for the matching networks is presented, which requires minimal numerical optimization. The amplifier is prototyped and measured and found to be in good agreement with simulation.en© 2019 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.Rectangular waveguidesImpedance matchingWaveguide discontinuitiesEquivalent circuitsManufacturingPackagingIntegrated circuit modelingSubstrate-integrated waveguide (SIW)S-bandRadio frequency amplifiersCircuit modelsC-bandPostprint Article