Co‐polarized monostatic antenna with high Tx–Rx isolation for 2.4 GHz single channel full duplex applications

Nawaz, Haq; Gürbüz, Özgür; Tekin, İbrahim

doi:10.1002/mop.31687

Cited by 4 publications

(7 citation statements)

References 20 publications

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“…After validating the radiation characteristics of proposed antenna, the interport isolation of dual-port, dual CP antenna presented in Section 2 was improved by using an external SIC circuit between port 1 and port 2. e external SIC circuit is composed of two 3 dB couplers, a tunable RF attenuator, and voltage controlled phase shifter as illustrated in Figure 7. 3 dB coupler 1 placed at port 1 is used to tap a RF signal to add its modified version at port 2 through coupler 2. e tunable phase shifter and attenuator are used to achieve required signal inversion conditions for T x signals [5]. ese signal inversion conditions require that RF signals from each path (through antenna and SIC network) should be equal in magnitude and 180°out of phase when they are combined at port 2 for cancellation.…”

Section: Dual Circularly Polarized Antenna With Sic Circuit For Improved Isolationmentioning

confidence: 99%

“…It is important to mention here that SIC capabilities of external circuit are highly sensitive to phase and attenuation variations of phase shifter and attenuator in the SIC loop as such variations will directly disturb the intended signal inversion conditions. e SIC circuit has the ability to tune out or suppress the interport isolation degradation resulting from environmental reflections in real-time deployment scenarios of proposed dual CP antenna [5]. e proposed SIC mechanism provides narrow band isolation performance as the single-tap SIC circuit has the limitation of setting signal inversion SIC conditions ideally for single frequency only.…”

Section: Dual Circularly Polarized Antenna With Sic Circuit For Improved Isolationmentioning

confidence: 99%

“…However, it is very difficult and challenging task to achieve the high interport isolation for shared aperture (radiator) antenna with dual CP characteristics due to presence of both vertical and horizontal electric field components in each CP mode (RHCP and LHCP). e previously reported works on dual-port antennas with linear co-polarized characteristics have focused on suppression of interport coupling through signal inversion-based cancellation circuits [5] or balanced receive mode operation [6] to achieve high interport isolation for antennas with linear copolarized characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…e combination of the signal inversion and differential receive mode technique offers nice interport isolation for such linear co-polarized antennas [5]. However, the differential feeding-based isolation technique is not viable for shared aperture trimmed corner CP antennas.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dual Circularly Polarized Patch Antenna with Improved Interport Isolation for S-Band Satellite Communication

Nawaz

Niazi

Ahmad³

2021

International Journal of Antennas and Propagation

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This paper presents a bi-port, single-layered (planar), dual circularly polarized (CP) patch antenna with improved interport isolation for S-band satellite telemetry and telecommand applications. The dual-port, planar antenna is based on a square-shaped radiator with trimmed corner to achieve CP characteristics (RHCP and LHCP) for excitations from respective ports. However, the RF isolation between the two ports is very low due to strong power leakage from transmit (Tx) to transmit (Rx) port. The externally employed tunable self-interference cancellation (SIC) circuit achieves high isolation between orthogonal ports while axial ratio (AR) is ≤3 dB for both right and left handed circular polarization modes. The employed single-tap SIC circuit/loop attains the high interport isolation through signal inversion mechanism. The proposed antenna design achieves ≥72 dB peak interport isolation in addition to ≥30 dB and 15 dB port to port isolation over the isolation or SIC bandwidths of 15 MHz and 90 MHz (−10 dB bandwidth for both ports), respectively. The port to port isolation performance is improved without significant degradation in antenna radiation characteristics. The validation model of the presented planar antenna based on single element characterizes much better measured interport isolation performance compared to those dual CP printed antennas reported earlier as endorsed through detailed comparison

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Section: Dual Circularly Polarized Antenna With Sic Circuit For Improved Isolationmentioning

confidence: 99%

Section: Dual Circularly Polarized Antenna With Sic Circuit For Improved Isolationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dual Circularly Polarized Patch Antenna with Improved Interport Isolation for S-Band Satellite Communication

Nawaz

Niazi

Ahmad³

2021

International Journal of Antennas and Propagation

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“…Moreover, the polarization diversity is not desirable in many wireless communication including wireless remote sensing systems and communication systems for military applications [29]. The co-polarized antennas for such applications can achieve isolation through the combination of differential feeding (near field SIC) and single-tap analog/RF domain based SIC circuitry [31]. The IBFD operation based on co-polarized antenna also preserves the channel reciprocity and polarization based duplexing can be used for an additional full duplex wireless channel [32].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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This paper presents a unidirectional, left handed circularly polarized (LHCP), single layered antenna array with improved interport isolation for simultaneous transmit and receive (STAR) or in-band full duplex (IBFD) wireless applications. The proposed IBFD antenna is comprised of three identical and sequentially rotated LHCP radiating elements where two R x patches are symmetrically placed with respect to a single T x patch. The symmetry of proposed antenna structure results in same amount of coupling or self interference (SI) from T x element and differentially driven R x patches achieve effective suppression of resulting SI to obtain improved T x-R x interport isolation required for STAR applications. The deployed feed network for differential-driven R x operation is composed of a simple 3dB/180 • rat-race coupler (ring hybrid coupler) with nice in-band amplitude and out-of-phase balance characteristics. The implemented single layer, compact (antenna elements and feeding network etched on single-layered PCB) antenna array achieves 10dB return-loss bandwidth ≥ 75MHz for both T x and R x ports. The prototype achieves ≥ 47dB interport isolation in 75MHz bandwidth and 3 dB axial ratio beam-width is ∼ 60 • for implemented antenna. INDEX TERMS Left hand circular polarized (LHCP) antenna, improved interport isolation, in-band full duplex, self interference cancellation (SIC), 3dB/180 • ring hybrid coupler.

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Characterization of dual‐polarized monostatic patch antennas for full‐duplex applications

Nawaz

Niazi

2020

Engineering Reports

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This paper presents the characterization of two different dual‐polarized monostatic (shared radiator) antennas. As an example, the design and implementation of two dual‐polarized 2.4 GHz patch antennas are presented in this paper for in‐band full‐duplex (IBFD) or single‐channel full‐duplex (SCFD) wireless applications. Both the antennas use orthogonal feeding ports but differ in feeding structures. The effect of the shape of radiating patch (square shape vs circular shape) on interport RF isolation characteristics of dual‐polarized patch antenna is studied along with the effect of the feeding position on interport isolation of dual‐polarized square‐shaped patch with thin quarter‐wave microstrip feeds. The simulated interport isolation results for monostatic and bistatic dual‐polarized antennas are compared. The simulation results show the effect of slot length, slot width, stub length, size of patch, and feed line on intended frequency of operation for the single‐port slot‐coupled patch antenna. Finally, the performance of two dual‐polarized implemented antennas is analyzed by comparing the measured interport isolation (S12) results at a required operating frequency around 2.4 GHz. The implemented antenna with thin co‐planar quarter‐wave microstrip feeds provides 43 dB interport isolation, while the dual‐port slot‐coupled IBFD antenna has 70 dB interport isolation at the center frequency. The slot fed antenna provides > 55 dB port to port isolation within 10 dB return loss bandwidth of 50 MHz. The dimensions of the implemented antennas are 68 mm x 68 mm x 1.6 mm and 68 mm × 68 mm × 3.2 mm, respectively. Due to the use of high‐loss FR‐4, the radiation efficiencies and gains of both antennas are around 60% and 4 dBi, respectively. The novelty and contribution of this work are the design, implementation, and detailed analysis of two dual‐polarized compact antennas for full‐duplex applications.

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Co‐polarized monostatic antenna with high Tx–Rx isolation for 2.4 GHz single channel full duplex applications

Cited by 4 publications

References 20 publications

Dual Circularly Polarized Patch Antenna with Improved Interport Isolation for S-Band Satellite Communication

Dual Circularly Polarized Patch Antenna with Improved Interport Isolation for S-Band Satellite Communication

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

Characterization of dual‐polarized monostatic patch antennas for full‐duplex applications

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