Phased Array Antenna for Bi-Static Simultaneous Transmit and Receive (STAR) system

Son, Dong-Chan; Samaiyar, Aman; Elmansouri, Mohamed A.; Filipović, Dejan S.; Prasannakumar, Prathap Valale

doi:10.1109/ieeeconf35879.2020.9329698

Cited by 3 publications

(1 citation statement)

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“…SIC circuits have been typical designed to achieve 1) passive antenna cancellation, 2) radio frequency (RF) cancellation, and/or 3) digital cancellation. Examples of passive cancellation techniques employ decoupling circuits between antenna elements [9], [11], [12], beamforming architectures [10], [13], or circulators [14]- [16]. Typically, the first two techniques employ multiple antenna elements, implying increased hardware complexity.…”

Section: Introductionmentioning

confidence: 99%

Wideband, Low Profile Coupling Suppression Circuit for Simultaneous Transmit and Receive System Based on Hybrid Finite Impulse Response and Resonator Topology

Tarek

Alwan

2022

IEEE Access

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In-band full-duplex (IBFD) systems can double the spectral efficiency by enabling simultaneous transmission and reception within the same band. Key to realizing full-duplex radios is the cancellation of the self-interference (SI) that couples from the transmitting antenna into the receiving path. This is done by introducing a self-interference cancellations (SIC) circuit to significantly reduce the coupled transmit signal and avoid receiver's desensitization. Additionally, SI suppression becomes more challenging across broader bandwidths. This paper presents a novel, wideband, and low profile SIC circuit based on a hybrid Finite Impulse Response (FIR) and resonator filter topology. The latter is optimized to provide an average of 22dB cancellation across 800MHz in the L-band. Conventional, SIC circuits require a filter bank with at least two FIR filters to achieve such a wide bandwidth. Conversely, our FIR resonator design is low profile with a circuit size nearly half of that of a filter bank. Simulations show a minimum cancellation of 15dB and a maximum cancellation of 45dB. A prototype was fabricated and tested, showing an average of ∼ 20dB cancellation which is in good agreement with our simulation. Further, measured results show a minimum cancellation of 15dB and maximum cancellation of 27dB.

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