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Ultra-compact self-diplexing antenna based on quarter-mode substrate integrated waveguide with high isolation

Published online by Cambridge University Press:  12 August 2021

Ayman A. Althuwayb Open the ORCID record for Ayman A. Althuwayb [Opens in a new window]
Ayman A. Althuwayb*
Affiliation:
Department of Electrical Engineering, College of Engineering, Jouf University, Sakaka, Aljouf 72388, Kingdom of Saudi Arabia
*
Author for correspondence: Ayman A. Althuwayb, E-mail: [email protected]
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Abstract

This article presents the design of an ultra-compact cavity-backed self-diplexing antenna with high isolation employing quarter-mode substrate integrated waveguide (QMSIW). The proposed antenna is constructed by using QMSIW, slot, and two 50Ω feed lines. Two eighth-mode cavity resonators are designed by inserting a slot on the top side of the rectangular substrate integrated waveguide to operate at 2.6 and 4.9 GHz for long-term evolution and public safety band applications, respectively. The proposed design allows to tune any frequency band independently by keeping other bands unaltered. The size of antenna is ultra-compact, due to the use of QMSIW cavity. The isolation between two ports is >35 dB. The antenna achieves 5.34 and 5.68 dBi peak gains at 2.6 and 4.9 GHz, respectively. The efficiency of the antenna is >85% at both frequency bands. The antenna provides more than 20.9 dB front-to-back-ratio and better than 21 dB separation between co-to-cross polarization levels. The designed antenna is validated through fabrication and measurement.

Keywords

antennaquarter-mode substrate integrated waveguideself-diplexing
Type
Antenna Design, Modelling and Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 14 , Issue 7 , September 2022 , pp. 926 - 931
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press in association with the European Microwave Association

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