A dual‐band and wideband omnidirectional circularly polarized antenna based on VO2. Issue 3 (21st January 2019)

• Record Type: Journal Article
• Authors: Liu, Guo‐Biao; Huang, Tong; Zhang, Hai‐Feng; Zeng, Li
• Is Part Of: International journal of RF and microwave computer-aided engineering. Volume 29:Issue 3(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-01-21
• Subjects: circular polarization -- dual‐band and wideband antenna -- omnidirectional antenna -- temperature tailored -- VO2; Microwave devices -- Computer-aided design -- Periodicals; Computer-aided engineering -- Periodicals; 621.3813
• DOI: 10.1002/mmce.21676
• Languages: English
• ISSNs: 1096-4290

Abstract

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.