Self-Interference Cancellation Antenna Using Auxiliary Port Reflection for Full-Duplex Application

Wang, Xiyao; Che, Wenquan; Yang, Wanchen; Feng, Wenjie; Gu, Lizheng

doi:10.1109/lawp.2017.2750698

Cited by 38 publications

(21 citation statements)

References 14 publications

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“…e interport isolation performance and dimensions of presented antenna are compared with some of the previously reported 2.4 GHz dual polarized IBFD antennas [14,[26][27][28][29][30] as detailed in Table 1.…”

Section: International Journal Of Antennas and Propagationmentioning

confidence: 99%

A Compact, Bistatic Antenna System with Very High Interport Isolation for 2.4 GHz In-Band Full Duplex Applications

Nawaz

Shoaib

Niazi

et al. 2021

International Journal of Antennas and Propagation

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This paper presents a compact, dual polarized bistatic (two closely spaced transmit and receive radiators) patch antenna with excellent interport isolation performance. The presented antenna system employs differential receive mode operation for the cancellation of self-interference (SI) to achieve very high interport isolation for 2.4 GHz in-band full duplex (IBFD) applications. The presented antenna is based on two closely spaced radiators and a simple 3 dB/180° coupler for differentially excited receive mode operation. The 3 dB/180° coupler performs as a passive self-interference cancellation (SIC) circuit for the presented antenna. The small form-factor structure is realized through via interconnections between the receiving patch and SIC circuit. The prototype of the presented antenna characterizes better than 105 dB peak interport isolation. Moreover, the recorded interport isolation is more than 90 dB and 95 dB within 60 MHz and 40 MHz bandwidths, respectively. The measured gain and cross-polarization levels reflect superior radiation performance for the validation model of the proposed antenna. The presented antenna offers DC interport isolation too, which is required for active antenna applications. The novelty of this work is a compact (small form-factor) antenna structure with very high peak interport isolation along with wider SIC bandwidth as compared to previously reported antennas for full duplex applications.

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Section: International Journal Of Antennas and Propagationmentioning

confidence: 99%

A Compact, Bistatic Antenna System with Very High Interport Isolation for 2.4 GHz In-Band Full Duplex Applications

Nawaz

Shoaib

Niazi

et al. 2021

International Journal of Antennas and Propagation

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show abstract

“…From (1) and (13), (12) can be expressed as Figure 2 shows the variation in the magnitude of the Tx leakage signals in the branch-line coupler depending on k and m. The design equation D to minimize the Tx leakage signals is derived from (15) as follows:…”

Section: Design Of the Quasi-circulator Using The Asymmetric Couplermentioning

confidence: 99%

“…In electromagnetic-wave application systems such as radar sensors and wireless communication systems, the number and size of antennas should be considered in the implementation of the miniaturized module [1][2][3][4]. Since the antenna size depends on the operating frequency, it is more effective to reduce the number of antennas.…”

Section: Introductionmentioning

confidence: 99%

Quasi-Circulator Using an Asymmetric Coupler for Tx Leakage Cancellation

2018

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A quasi-circulator is proposed by using an asymmetric coupler with high isolation between the transmitting (Tx) and receiving (Rx) ports. The proposed quasi-circulator consists of quarter-wave transmission lines, which have unbalanced characteristic impedances and the terminated port, which is purposely unmatched with the reference impedance in the coupler. The port compensates for the asymmetric impedances of the coupler using the proposed design parameter. Because of its asymmetric structure and the usage of the unmatched port, the proposed circulator can be accurately designed to have high Tx–Rx isolation without increasing the signal losses in the Tx and Rx paths at the operating frequency. The proposed quasi-circulators show isolation improvements of 9.07 dB at 2.45 GHz and 7.95 dB at 24.125 GHz compared with conventional circulators using the symmetric couplers. The characteristic improvement of the proposed quasi-circulator was demonstrated by the increase of the detectable range of the 2.45 GHz Doppler radar sensor with the quasi-circulator.

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“…The most significant of them is the high level of self-interference. The power of this undesired signal can be much stronger than the targeted signal [3]. Hence, the received signal of interest may become unrecognizable and distorted due to RF leakage between transmitting and receiving terminals.…”

Section: Introductionmentioning

confidence: 99%

Differential-Fed Log-Periodic Dipole Array With High Isolation for Wideband Full-Duplex Communications

Nguyen¹,

Karacolak²

2021

PIER C

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This study presents a differentially driven log-periodic dipole array system with high isolation between reception and transmission ports for wideband full-duplex applications. The antenna system is composed of two pairs of log-periodic dipole arrays operating in the X-band spectrum from 8 GHz to 12 GHz. The system offers a low cross-polarization between E-plane and H-plane (less than −25 dB). The simulation results show high isolation S 21 < −60 dB through the entire X-band while the measured results reach S 21 < −45 dB in a reflective lab room. Furthermore, in order to verify the measured values, a modified 180 • out-of-phase wideband power divider is used to feed transmitting and receiving ports. The second measured outcomes also attain total isolation greater than 45 dB for the entire band of interest. The proposed design is able to cover both orthogonal transmitted and received directions with reasonable gain values, high efficiency, and good impedance matching.

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Self-Interference Cancellation Antenna Using Auxiliary Port Reflection for Full-Duplex Application

Cited by 38 publications

References 14 publications

A Compact, Bistatic Antenna System with Very High Interport Isolation for 2.4 GHz In-Band Full Duplex Applications

A Compact, Bistatic Antenna System with Very High Interport Isolation for 2.4 GHz In-Band Full Duplex Applications

Quasi-Circulator Using an Asymmetric Coupler for Tx Leakage Cancellation

Differential-Fed Log-Periodic Dipole Array With High Isolation for Wideband Full-Duplex Communications

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