Single Layer, Differentially Driven, LHCP Antenna With Improved Isolation for Full Duplex Wireless Applications

Nawaz, Haq; Niazi, Ahmad Umar; Basit, Muhammad Abdul; Usman, Muhammad

doi:10.1109/access.2019.2954947

Cited by 9 publications

(13 citation statements)

References 37 publications

(49 reference statements)

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“…As shown in Figures 9a,b, the cancellation can be achieved by placing two TX antennas at the distance of D and D + λ/2 away from the RX antenna, or by feeding two TX antennas with 180° phase difference at the same distance away from the RX antenna [55,56]. As illustrated in Figure 9c, one can also acquire near-field cancellation by circularly arranging several TX antennas around a RX antenna and exciting the circular TX antenna array with gradient phases [13,15,[57][58][59][60][61].…”

Section: Near-field Cancellationmentioning

confidence: 99%

Antenna/Propagation Domain Self-Interference Cancellation (SIC) for In-Band Full-Duplex Wireless Communication Systems

Chen

Ding

Jia

et al. 2022

Sensors

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In-band full duplex (IBFD) is regarded as one of the most significant technologies for addressing the issue of spectrum scarcity in 5G and beyond systems. In the realization of practical IBFD systems, self-interference, i.e., the interference that the transmitter causes to the collocated receiver, poses a major challenge to antenna designers; it is a prerequisite for applying other self-interference cancellation (SIC) techniques in the analog and digital domains. In this paper, a comprehensive survey on SIC techniques in the antenna/propagation (AP) domain is provided and the pros and cons of each technique are studied. Opportunities and challenges of employing IBFD antennas in future wireless communications networks are discussed.

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Section: Near-field Cancellationmentioning

confidence: 99%

Antenna/Propagation Domain Self-Interference Cancellation (SIC) for In-Band Full-Duplex Wireless Communication Systems

Chen

Ding

Jia

et al. 2022

Sensors

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“…Near field cancellation [21] 0.56 GHz -2.75 GHz 27 dB/ 2.2 GHz RHCP (Tx/Rx) Near field cancellation [39] 1.2 GHz 40 dB/1.2 GHz RHCP (Tx/Rx) Near field cancellation [40] 75 MHz 47 dB/ 75 MHz LHCP (Tx/Rx) Near field cancellation [41] 100 MHz 47 dB/100 MHz RHCP/LHCP Near field cancellation [42] 520 MHz 37 dB/ 520 MHz Linear pol.…”

Section: Avg Isolation/ Bandwidthmentioning

confidence: 99%

Co-Circularly Polarized Planar Antenna With Highly Decoupled Ports for S-Band Full Duplex Applications

et al. 2022

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This work presents a unidirectional, co-circularly polarized (CP), printed antenna with highly decoupled or isolated transmit (T x ) and receive (R x ) ports for 2.4 GHz in-band full duplex (IBFD) applications. The presented antenna topology is based on four similar and sequentially rotated trimmed patches with right hand circular polarized (RHCP) characteristics. The symmetrical placement of two T x patches with respect to both R x elements results in equal levels of self interference (SI) which was suppressed through balanced excitation of T x mode. This mechanism results in effective suppression of SI at each R x patch. The residual SI is suppressed further through a second balanced feeding network deployed at R x port of proposed antenna topology. The employed balanced feeding networks provide superior performance of ≤ 0.5 dB and 6° magnitude and phase imbalances respectively between the two balanced output ports over the bandwidth of interest. The measured results for prototype of presented antenna achieve -10 dB bandwidth of better than 100 MHz for both T x and R x ports. The measured interport coupling for validation model ≤ -70 dB across the entire bandwidth of 100 MHz. As per best of authors' knowledge, the presented antenna is the first one to report such reduced levels of interport coupling over the whole impedance bandwidth of planar antenna with unidirectional radiation patterns and co-RHCP characteristics for both T x and R x modes across the overlapped bandwidth.INDEX TERMS Circularly polarized antenna, unidirectional radiation pattern, reduced interport coupling, self interference suppression, balanced feeding network.

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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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Single Layer, Differentially Driven, LHCP Antenna With Improved Isolation for Full Duplex Wireless Applications

Cited by 9 publications

References 37 publications

Antenna/Propagation Domain Self-Interference Cancellation (SIC) for In-Band Full-Duplex Wireless Communication Systems

Antenna/Propagation Domain Self-Interference Cancellation (SIC) for In-Band Full-Duplex Wireless Communication Systems

Co-Circularly Polarized Planar Antenna With Highly Decoupled Ports for S-Band Full Duplex Applications

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

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