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Stacked patch antenna with wider impedance bandwidth and high interport isolation for 2.4 GHz IBFD transceiver

Published online by Cambridge University Press:  03 May 2021

Haq Nawaz Open the ORCID record for Haq Nawaz [Opens in a new window]  and
Ahmad Umar Niazi
Haq Nawaz*
Affiliation:
Electronics Engineering Department, University of Engineering and Technology (UET) Taxila, Sub-Campus Chakwal 48800, Pakistan
Ahmad Umar Niazi
Affiliation:
Electronics Engineering Department, University of Engineering and Technology (UET) Taxila, Sub-Campus Chakwal 48800, Pakistan
*
Author for correspondence: Haq Nawaz, E-mail: haq.nawaz@uettaxila.edu.pk
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Abstract

This paper reports a bi-port, wideband, parasitic-fed, single/shared patch antenna with enhanced interport isolation for 2.4 GHz in-band full duplex (IBFD) applications. The employed parasitic feeding provides comparatively the wider impedance bandwidth and better gain for the presented antenna. The improved self-interference cancellation (SIC) levels across the required bandwidth are obtained through differentially-driven receive (Rx) mode operation. The differential Rx operation performs effective cancellation of in-band self-interference (SI) through signal inversion mechanism to achieve the additional isolation on the top of the intrinsic isolation of polarization diversity. The validation model for the presented antenna features ≥88 dB peak isolation between the dual-polarized Tx and Rx ports. In addition, the measured Tx–Rx isolation for prototype is >70 dB across the 10 dB return loss bandwidth of 100 MHz (2.42–2.52 GHz). The measured gain for each mode is better than 7.0 dBi. The novelty of this work is that compared to previously reported designs, the presented antenna offers wider impedance bandwidth and improved SIC levels in addition to superior gain performance. To the best of our knowledge, this is the first single/shared patch antenna which provides better than 70 dB interport isolation across the 10 dB return loss bandwidth of 100 MHz along with 7.0 dBi gain for Tx/Rx modes.

Keywords

Parasitic feedingdifferential excitationin-band full duplexsingle antennahigh isolationself-interference cancellationdual polarization
Type
Antenna Design, Modeling and Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 14 , Issue 5 , June 2022 , pp. 590 - 594
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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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