Abstract
In this article, a dual-band and wideband omnidirectional circularly polarized (CP) antenna based on the vanadium dioxide (VO2) is investigated. The operating bandwidth of such an antenna can be regulated by altering the outside temperature (T), which is attained by the insulator-metal transition of VO2. The omnidirectional CP antenna is based on a loop antenna-dipole model, which is composed of four tilted metal and VO2 resonant units that are loaded around a cuboid and a feeding network for broadening bandwidth. The simulated results show that when T = 50°C (State I), the 10-dB impedance bandwidth is 45.7% (1.67-2.66 GHz), and the 3-dB axial ratio (AR) bandwidth is 40% (1.9-2.85 GHz). When T = 80°C (State II), the 10-dB impedance bandwidth is 13.8% (1.62-1.86 GHz), and the 3-dB AR bandwidth is 21.8% (1.68-2.09 GHz). In order to further characterize the concept of the proposed antenna, the related parameters of such an antenna are studied using simulation software HFSS.
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