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A frequency-reconfigurable antenna based on periodically loading ferroelectric MIM capacitors along a slot loop is designed, fabricated, and measured. The antenna is fabricated on a 430m-thick sapphire substrate with a total area of 1×1 cm. The size of the slot loop is 2.5×2.5mm. By changing the bias voltage of the ferroelectric varactors from 0V to 7V, the resonant frequency of the varactor-loaded antenna can be tuned from 5.57GHz to 7.33GHz, corresponding to a tuning range of 27.3%, while keeping the return loss greater than 10 dB. At 5.57GHz, the size of the slot loop is 0.046×0.046 0 .When biased at 7V, the antenna gain is 10.8 dBi at 7.35GHz. Under 0-V bias, the Pin,1 dB of the tunable antenna is 18.8 dBm at 5.6GHz.

A frequency-reconfigurable slot loop antenna using ferroelectric MIM capacitors