Ultra-Wideband Dual-Polarized Patch Antenna With Four Capacitively Coupled Feeds

Zhu, Fuguo; Gao, Steven; Ho, Anthony T. S.; Abd-Alhameed, Raed A.; See, Chan H.; Brown, Tim W. C.; Li, Jianzhou; Wei, Gao; Xu, Jiadong

Abstract

A novel dual-polarized patch antenna for ultra-wideband
(UWB) applications is presented. The antenna consists of a
square patch and four capacitively coupled feeds to enhance the
impedance bandwidth. Each feed is formed by a vertical isosceles
trapezoidal patch and a horizontal isosceles triangular patch. The
four feeds are connected to the microstrip lines that are printed
on the bottom layer of the grounded FR4 substrate. Two tapered
baluns are utilized to excite the antenna to achieve high isolation
between the ports and reduce the cross-polarization levels. In order
to increase the antenna gain and reduce the backward radiation,
a compact surface mounted cavity is integrated with the antenna.
The antenna prototype has achieved an impedance bandwidth of
112% at (|S11 | ≤ -10 dB) whereas the coupling between the
two ports is below -28 dB across the operating frequency range.
The measured antenna gain varies from 3.91 to 10.2 dBi for port 1
and from 3.38 to 9.21 dBi for port 2, with a 3-dB gain bandwidth
of 107%.

• Journal Article Type: Article
• Acceptance Date: Feb 16, 2014
• Online Publication Date: Feb 26, 2014
• Publication Date: 2014-05
• Deposit Date: Mar 15, 2019
• Publicly Available Date: Apr 2, 2019
• Journal: IEEE Transactions on Antennas and Propagation
• Print ISSN: 0018-926X
• Electronic ISSN: 1558-2221
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 62
• Issue: 5
• Pages: 2440-2449
• DOI: https://doi.org/10.1109/tap.2014.2308524
• Keywords: Capacitively coupled feed, dual-polarized antenna, patch antenna, surface mounted cavity, UWB antenna.
• Public URL: http://researchrepository.napier.ac.uk/Output/1662582
• Contract Date: Mar 15, 2019