Abstract
We report the concept of a frequency tunable antenna device operating in the millimeter wave frequency domain. The ability of the antenna to switch between two frequency states is achieved by the monolithic integration of a metal-insulator transition material (vanadium dioxide, VO2). The VO2 material is an insulator at room temperature but can be driven in a high conductivity metallic state when it is electrically activated using a continuous (DC) voltage. The antenna design is based on a slot antenna excited by a microstrip line having a length that can be conveniently varied using a VO2-based switch. Following the high-frequency VO2 material characterization, we present its monolithic integration in the device prototype along with the comparison between the measured and the simulated performances of the agile antenna. Thus, depending on the VO2 material state, the antenna device can be conveniently switched between 33 and 37 GHz operating frequency bands presenting stable radiation patterns with 5.28 dBi and 5.41 dBi maximum gains, respectively.
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