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A compact, dual-polarized patch antenna with improved Tx–Rx isolation for 2.4 GHz single frequency full-duplex applications

Published online by Cambridge University Press:  13 May 2020

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

A compact dual-polarized monostatic antenna (single radiator for transmit and receive modes) is presented with differential receive mode operation to achieve excellent interport isolation for 2.4 GHz single frequency full-duplex or in-band full-duplex applications. The presented antenna comprises three ports radiating element (patch) and a simple 3 dB/180o ring hybrid coupler has been utilized for differentially excited receive mode operation. The 3 dB/180o ring hybrid coupler acts as a self-interference cancellation (SIC) circuit for effective suppression of RF leakage from the transmit port to provide very high interport decoupling between transmit and receive ports. A compact antenna structure has been realized by using two-layered printed circuit board through vias interconnections of both receive ports of the antenna with inputs of SIC circuit. The validation model of proposed antenna offers more than 95 dB peak interport isolation. Moreover, the experimentally measured interport isolation is better than 70 dB throughout the antenna's 10 dB return-loss impedance bandwidth (BW) of 50 MHz (2.38–2.43 GHz). Furthermore, the recorded isolation is more than 80 dB in 20 MHz BW. The implemented antenna has good radiation characteristics including nice gain and low cross-polarization levels as endorsed by measurements. Same antenna structure with microstrip-T feeds can provide DC isolated ports with same interport RF isolation performance for active antenna applications. Such antenna with DC interport isolation will avoid the requirements of additional series capacitors on transmit and receive ports of antenna.

Keywords

High interport isolationfull duplex antennadifferential feedingdual polarizationself interference cancellation (SIC)
Type
Antenna Design, Modeling and Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 13 , Issue 3 , April 2021 , pp. 266 - 273
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Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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