Open AccessBroadband polarisation reconfigurable antenna based on crossed dipole and parasitic elements for LTE/sub‐6GHz 5G and WLAN applications
Author(s) -
Jin Guiping,
Li Long,
Wang Wei,
Liao Shaowei
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.2019.1137
Subject(s) - reconfigurability , dipole antenna , microstrip antenna , reconfigurable antenna , broadband , bandwidth (computing) , optics , physics , omnidirectional antenna , microstrip , dipole , antenna (radio) , optoelectronics , coaxial antenna , telecommunications , computer science , quantum mechanics
Broadband polarisation reconfigurable antenna based on crossed dipole and parasitic elements is proposed in this study, which can switch among three polarisation modes, i.e. linear polarisation, left‐hand circular polarisation and right‐hand circular polarisation. The proposed antenna consists of two crossed dipoles fed by a 3/4 square ring, two microstrip feeding elements etched at the centre of the upper and lower sides of the dielectric substrate, and three sets of microstrip parasitic elements helping broaden the axial‐ratio (AR) bandwidth. Four PIN diodes are embedded between each crossed dipole and the microstrip feeding element, which enable the polarisation reconfigurability. The working principle of polarisation reconfigurability is analysed in detail. The measured results show that the proposed antenna has a −10 dB overlapped impedance bandwidth of 63.5% (2.04–3.94GHz) and the 3 dB overlapped AR bandwidth is about 54.5% (2.4–4.2GHz), resulting in a wide overall bandwidth of 48.6% (2.40–3.94GHz). Besides, the measured peak gain of this antenna reaches up to 8.5 dBi. The proposed antenna can be a good candidate for 2.45GHz WiFi, LTE 4G, and sub‐6GHz 5G applications.