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A concept to digitally tune Substrate Integrated Waveguide resonators using FET switches is presented. Simulation results are provided for designs at 73 GHz on GaAs. Also, simulation and measured results are provided at 23 GHz for a PCB prototype. The 73 GHz design has a tuning range of 580 MHz and an average unloaded Q of 121. The 23 GHz PCB prototype has a measured tuning range of 260 MHz and average unloaded Q of 72.9.
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Ball et al. (2024) studied this question.
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