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Its driven by a micro controller. This I can set to whatever speed I need so isn't a problem, Its a automated tuning circuit for a HF RFID antenna and the response isn't that crucial. Im not an RF engineer so this is a new area to me, after a bit of reading online I came to the conclusion...

My mistake. The 13.56 is the signal being switched. The switch itself is controlled by an external source so is operating at nowhere near that speed.

Hi I’m trying to create a capacitor switching circuit using a bank of SSR's as the switching component. The signal is at 13.56Mhz. The problem I’m having is that the output capacitance of the SSR's is too high. There’s 8 of these devices in a row which when all turned off are creating a minimum...