Dual-polarized, monostatic antenna array with improved Tx–Rx isolation for 2.4 GHz in-band full duplex applications

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

doi:10.1017/s1759078719001569

Cited by 7 publications

(7 citation statements)

References 31 publications

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“…So various SIC techniques are used to achieve additional isolation on the top of polarization isolation for the case of single-patch antenna-based IBFD transceiver. For instance, the addition isolation can be achieved through SIC techniques based on differential feeding employed at T x or R x ports [9][10][11][12][13], by using impedance mismatched terminal circuit for inherent SI suppression [14] or through double differential feeding at both ports for effective SIC [15]. The differential feeding is a near-filed SIC technique to provide very high interport isolation levels for such antennas [9][10][11][12][13]15].…”

Section: Introductionmentioning

confidence: 99%

Stacked patch antenna with wider impedance bandwidth and high interport isolation for 2.4 GHz IBFD transceiver

Nawaz

Niazi

2021

Int. J. Microw. Wireless Technol.

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This paper reports a bi-port, wideband, parasitic-fed, single/shared patch antenna with enhanced interport isolation for 2.4 GHz in-band full duplex (IBFD) applications. The employed parasitic feeding provides comparatively the wider impedance bandwidth and better gain for the presented antenna. The improved self-interference cancellation (SIC) levels across the required bandwidth are obtained through differentially-driven receive (Rx) mode operation. The differential Rx operation performs effective cancellation of in-band self-interference (SI) through signal inversion mechanism to achieve the additional isolation on the top of the intrinsic isolation of polarization diversity. The validation model for the presented antenna features ≥88 dB peak isolation between the dual-polarized Tx and Rx ports. In addition, the measured Tx–Rx isolation for prototype is >70 dB across the 10 dB return loss bandwidth of 100 MHz (2.42–2.52 GHz). The measured gain for each mode is better than 7.0 dBi. The novelty of this work is that compared to previously reported designs, the presented antenna offers wider impedance bandwidth and improved SIC levels in addition to superior gain performance. To the best of our knowledge, this is the first single/shared patch antenna which provides better than 70 dB interport isolation across the 10 dB return loss bandwidth of 100 MHz along with 7.0 dBi gain for Tx/Rx modes.

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Section: Introductionmentioning

confidence: 99%

Stacked patch antenna with wider impedance bandwidth and high interport isolation for 2.4 GHz IBFD transceiver

Nawaz

Niazi

2021

Int. J. Microw. Wireless Technol.

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“…Recently, the interport isolation techniques based on near field SIC topologies have been emerged to achieve excellent isolation levels through compact printed antennas [33][34][35][36][37]. Such techniques are equally effective for single antenna element [33][34][35][36] and antenna array configurations [37]. Moreover, these techniques provide nice SIC performance both for shared antenna and separate antenna architectures.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the near field SIC techniques are well efficient both for dual polarized and co-polarized antennas to achieve either directional or omnidirectional radiations. However, the achievable isolation performance of near field SIC techniques rely on the characteristics of the employed feeding networks and symmetry of R x elements/ports with respect to T x element/port [33][34][35][36][37].…”

Section: Introductionmentioning

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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“…[6][7][8] The additional isolation on the top of polarization diversity isolation can be achieved through various techniques. For instance, these techniques include the use of differential feeding at T x /R x ports, [9][10][11][12][13][14] inherent SI suppression through reconfigurable impedance mismatched terminal circuit 15 and deploying the differential feeding at both T x and R x ports simultaneously for effective SIC operation to achieve very high isolation levels. 16 Although, the differential feeding provides excellent isolation levels for monostatic antennas; however, the isolation levels are significantly degraded by the environmental reflections for such antennas when these are deployed for real-time communication between two wireless nodes.…”

Section: Introductionmentioning

confidence: 99%

“…The additional isolation on the top of polarization diversity isolation can be achieved through various techniques. For instance, these techniques include the use of differential feeding at T x /R x ports, 9‐14 inherent SI suppression through reconfigurable impedance mismatched terminal circuit 15 and deploying the differential feeding at both T x and R x ports simultaneously for effective SIC operation to achieve very high isolation levels 16 …”

Section: Introductionmentioning

confidence: 99%

High isolation, proximity‐fed monostatic patch antennas with integrated self‐interference cancellation‐taps for ISM band full duplex applications

Nawaz

Niazi

Chaudhry

2020

Int J RF Microw Comput Aided Eng

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This work presents two dual polarized proximity-fed monostatic patch antennas with improved interport isolation for 2.4 GHz industrial, scientific and medical band same frequency full duplex wireless applications. The presented antennas achieves the high interport decoupling through intrinsic isolation of the polarization diversity in conjunction with a simple single-tap and two-taps self-interference cancellation (SIC) topologies. The polarization diversity isolation is achieved through two perpendicular microstrip feeds for proximity feeding to excite orthogonal polarization mode for transmit (T x) and receive (R x) modes. The prototype for proposed antenna with integrated single-tap and two-taps SIC circuit is tested to record its interport isolation, impedance bandwidths and gains for both T x and R x ports. The implemented antenna with single-tap SIC circuit demonstrates 10 dB return-loss bandwidth of ≥100 MHz for both T x and R x ports. The measured isolation exceeds 40 dB over the 40 MHz bandwidth. Moreover, the recorded peak isolation is better than 74 dB for implemented antenna prototype. Furthermore, the 40 MHz bandwidth with 40 dB isolation can be tuned with the help of SIC-tap as demonstrated through the experimental results. The measured gain levels are around 4.6 dBi for both T x and R x port. The same antenna structure with integrated two-taps SIC topology features better than 55 dB isolation within 10 dB return loss bandwidth of 100 MHz. The peak isolation exceeds 97 dB and isolation levels are better than 60 and 80 dB over 50 and 20 MHz bandwidths, respectively, for presented antenna with two-taps SIC configuration. The compact antenna offers comparatively wider impedance and isolation bandwidth with improved SIC levels compared to previous designs.

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Dual-polarized, monostatic antenna array with improved T_x–R_x isolation for 2.4 GHz in-band full duplex applications

Cited by 7 publications

References 31 publications

Stacked patch antenna with wider impedance bandwidth and high interport isolation for 2.4 GHz IBFD transceiver

Stacked patch antenna with wider impedance bandwidth and high interport isolation for 2.4 GHz IBFD transceiver

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

High isolation, proximity‐fed monostatic patch antennas with integrated self‐interference cancellation‐taps for ISM band full duplex applications

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