Design and full-wave analysis of nonconformal Fermat-like spiral multi-port microantenna sensors

Reconfigurability in an antenna sensor is a desired characteristic that has attracted of attention in recent years. In this work, a novel class of nonconformal Fermat-like spiral multi-port microantennas for next-generation remote sensing applications is presented. The antenna 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 device are investigated accurately. The sensor reconfigurability, in terms of frequency of operation and radiation efficiency, is technically achieved by a suitable solid-state tuning circuitry adopted to dynamically change the feeding/loading conditions at the antenna input ports.