The present invention features a reconfigurable resonant cavity specifically for use with a slot radiator. A series of internal planes with frequency-selective materials disposed on their top surfaces, in conjunction with switchable shorting pins, is used to reconfigure the cavity's resonant frequency. PIN diodes, MEMS or other photonically or electrical activated switching devices may be used to selectively 'activate' shorting pins. A single resonant cavity may be electrically reconfigured to operate at two, three, or even more different frequency bands.
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