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2.4 GHz dual polarised monostatic antenna with simple two-tap RF self-interference cancellation (RF-SIC) circuitry

2.4 GHz dual polarised monostatic antenna with simple two-tap RF self-interference cancellation (RF-SIC) circuitry

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This Letter presents a dual polarised monostatic patch antenna with a simple two-tap RF/analogue domain-based self-interference cancellation (SIC) (RF-SIC) circuitry to achieve high interport isolation in a comparatively wider bandwidth for a 2.4 GHz in-band full duplex wireless transceiver. A brief mathematical description for the deployed two-tap RF-SIC is also presented to provide insight into self-interference (SI) suppression in a comparatively wider bandwidth. The implemented antenna with a two-tap RF-SIC circuitry achieves around 80 dB Tx–Rx isolation for a 20 MHz bandwidth in addition to more than 90 dB peak isolation for measurements performed in a lab environment where SI may result from the nearby placed objects. The deployed two-tap RF-SIC circuit can be tuned to effectively cancel out SI caused by reflections of the radio signal from the surroundings. Moreover, an 80 dB isolation bandwidth can be tuned within a 10 dB return loss bandwidth of the implemented dual polarised antenna.

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      • 6. Nawaz, H., Tekin, I.: ‘Three dual polarized 2.4 GHz microstrip patch antennas for active antenna and in-band full duplex applications’. 16th Mediterranean Microwave Symp. (MMS), Abu Dhabi, UAE, November 2016, pp. 14.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2018.7489
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