A dual‐band and wideband omnidirectional circularly polarized antenna based on VO₂

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.

Recent Advancements in Reconfigurable mmWave Devices Based on Phase-Change and Metal Insulator Transition Materials

“…In recent years, a variety of tunable omnidirectional circularly polarized (CP) antenna have been reported using VO 2 . For example, Guo-Biao Liu et al [127] reported dual band and wideband omnidirectional CP antenna which shown a 10-dB impedance bandwidth of 45.7% (1.67-2.66 GHz) and a 3-dB AR bandwidth of 40% (1.9-2.85 GHz), when the VO 2 was thermally elevated at 50 • C (state I). When T = 80 • C (State II), the omnidirectional CP antenna operates at a lower frequency band, with a 10-dB impedance bandwidth of 13.8% (1.62-1.86 GHz), and a 3-dB AR bandwidth of 21.8% (1.68-2.09 GHz).…”

An Ultra-Compact 28 GHz Arc-Shaped Millimeter-Wave Antenna for 5G Application

“…The operational bands under consideration for 5G mobile networks include 28 GHz, 38 GHz, 60 GHz, and 70 GHz. On the other hand, the 28 GHz and 38 GHz bands are useful for cellular networks, but operating on higher frequency bands would pose challenges to the antenna-configuration mobile communication systems [ 5 , 6 ]. The antenna is one of the crucial components in the transmission link of the future 5G network.…”