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Reconfigurability in an antenna system is a desired characteristic that has attracted of attention in the past years. In this work, a novel class of nonconformal Fermat-like spiral multi-port microantennas for next-generation wireless communications and radar applications is presented. The device modeling is carried out by using a computationally enhanced locally conformal finite-difference time-domain full-wave procedure. In this way, the circuital characteristics and radiation properties of the antennas are investigated accurately. The structure reconfigurability, in terms of frequency of operation and radiation efficiency, is technically performed by a suitable solid-state tuning circuitry adopted to properly change the feeding/loading conditions at the antenna input ports.