Open AccessDual‐linear polarisation reconfigurable broadband omnidirectional antenna
Author(s) -
Li Angjie,
Jiang Wen,
Gong Shuxi
Publication year - 2020
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2020.0022
Subject(s) - omnidirectional antenna , optics , dipole antenna , coaxial antenna , radiation pattern , broadband , reconfigurable antenna , physics , antenna (radio) , pin diode , antenna measurement , computer science , acoustics , telecommunications , diode , optoelectronics
A dual‐linear polarisation reconfigurable broadband omnidirectional antenna is proposed. The radiating structure consists of a slotted ring and an inner square loop, which can generate omnidirectional radiation based on characteristic mode analysis. A dipole feeding network is designed and four PIN diodes are loaded into the feeding network to change the current flow direction. The final dimensions of the proposed antenna are 0.2 × 0.2 λ 0 ( λ 0 is the free‐space wavelength), with a low profile of 0.006 λ 0 . The measured results show that the antenna achieves an overlapped bandwidth of 49.6% (from 480.2 to 797.5 MHz) with | S 11 | < −10 dB and a gain variation between −1 and 0.4 dBi. The proposed antenna can be applied to a digital terrestrial television service and an unmanned aerial vehicle pattern measuring system.