Peregrine makes several digitally tunable capacitors (switched capacitor banks) that work to S-band and can handle moderate power. I have used them for antenna

Peregrine makes several digitally tunable capacitors (switched capacitor banks) that work to S-band and can handle moderate power. I have used them for antenna tuning. https://www.psemi.com/products/digitally-tunable-capacitors-dtc https://www.psemi.com/products/digitally-tunable-capacitors-...