We present a switch matrix for automatic tuning and detuning of a metasurface-resonator employed to enhance MRI scanning performance. A digital circuit with an inductor was used to pick up the magnetic field and generate a clock for switching which does not require any wire connection to the MRI scanner. The clock was used to activate an array of MOSFET switches, each of them connected to an adjacent pair of parallel wires of the resonator. The circuit was tested using a solenoid and the metasurface resonance frequency was successfully tuned and detuned (cloaked) when the magnetic field was off-on respectively.
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