Oyedokun, T.T.OyedokunGeschke, R.H.R.H.GeschkeStander, T.T.Stander2022-03-062022-03-062022https://publica.fraunhofer.de/handle/publica/26920610.1017/S1759078721000507We present a tunable planar groove gap waveguide (PGGWG) resonant cavity at Ka-band. The cavity demonstrates varactor loading and biasing without bridging wires or annular rings, as commonly is required in conventional substrate-integrated waveguide (SIW) resonant cavities. A detailed co-simulation strategy is also presented, with indicative parametric tuning data. Measured results indicate a 4.48% continuous frequency tuning range of 32.52-33.98 GHz and a Qu tuning range of 63-85, corresponding to the DC bias voltages of 0-16 V. Discrepancies between simulated and measured results are analyzed, and traced to process variation in the multi-layer printed circuit board stack, as well as unaccounted varactor parasitics and surface roughness.en621537journal article