A Wideband, Unidirectional Circularly Polarized Antenna for Full-Duplex Applications

Wu, Jie; Li, Mingjian; Behdad, Nader

doi:10.1109/tap.2018.2794063

Cited by 62 publications

(40 citation statements)

References 27 publications

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“…The presented antenna configuration resolves this issue through a well balanced differential Rx mode operation. The gain of presented antenna can be improved significantly by using low loss substrate as is the case with antenna presented in [36] with realized gain of 8.7dBic. Moreover, the size of implemented antenna can be reduced by implementing the ring hybrid coupler on the backside of radiating elements to realize an integrated planar structure.…”

Section: Experimental Results For Implemented Compact Lhcp Antennmentioning

confidence: 83%

“…The work reported in [36] achieved over 40dB isolation for antenna with RHCP for both T x and R x chains, however it was based on multilayered structure. Compared to previously reported antennas, the novelty of presented antenna is singlelayered antenna array architecture (reduced implementation complexity) and excellent interport isolation through effective reduction and cancellation of inter-element coupling (mutual coupling) and T x leakage at R x port.…”

Section: Experimental Results For Implemented Compact Lhcp Antennmentioning

confidence: 99%

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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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Section: Experimental Results For Implemented Compact Lhcp Antennmentioning

confidence: 83%

Section: Experimental Results For Implemented Compact Lhcp Antennmentioning

confidence: 99%

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

et al. 2019

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“…The isolation between the TX and RX channels can be extremely high. In some designs, this concept was realized using two linear orthogonal polarizations created by an antenna fed by a hybrid ring coupler of a size comparable to the antenna [9], [10], while in others, it was realized using two circular orthogonal polarizations (e.g., right-and left-hand circular polarizations) created by four patches [11] or two spiral antennas [12]. The isolation of this kind of designs is typically limited by the imperfections of the fabricated antennas and the feed networks, and it is very sensitive to the degree of symmetry of the antennas and feed structures.…”

Section: Introductionmentioning

confidence: 99%

Characteristic-Mode-Based Design of Planar In-Band Full-Duplex Antennas

Shih

2020

IEEE Open J. Antennas Propag.

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In-band full-duplex radios demand simultaneous transmit and receive (STAR) antennas with high isolation, compact and ultra-low profiles, and simple feed networks. Current state-of-the-art designs rarely meet all of these requirements at the same time. In this paper, we present a characteristicmode-based design approach to achieve high isolation using compact fully-planar STAR antennas with a simple feed structure. The proposed method utilizes two characteristic modes of a conducting object as transmit and receive chains to achieve high isolation without a complicated self-interference cancellation circuit. The design example in this work is fully-planar, and it has a physical height of 1.6 mm. The measured −10 dB overlapped |S11| and |S22| fractional bandwidth of this STAR antenna is 2.5% and the measured isolation between the transmit and receive ports is greater than 30 dB over the entire frequency band of operation. Index Terms-Characteristic mode theory, in-band full-duplex antennas, in-band full-duplex radios, low-profile antennas, and simultaneous transmit and receive (STAR) antennas.

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“…In DCP antennas, high port-to-port isolation is necessary in communication links having high capacity. This feature, along with high bandwidth, is also essential in simplifying receiver designs as self-interference cancellation requirement will be less at the receiver stage [2]. Also, polarimetric applications require low mutual coupling between antenna ports for better accuracy [1].…”

mentioning

confidence: 99%

“…Also, polarimetric applications require low mutual coupling between antenna ports for better accuracy [1]. An ample number of DCP antennas can be found in the literature [2][3][4][5][6][7]. In [2], a DCP antenna is presented that is designed to operate between 6 and 7.2 GHz.…”

mentioning

confidence: 99%

Dual circularly polarised travelling wave slot antenna array

et al. 2019

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A series-fed dual circularly polarised planar slot antenna array is presented. The radiating slots of the antenna are located on the ground plane and are excited by means of a ring-shaped microstrip line comprising of rectangular sections. A metallic reflector lies underneath the feed network separated by an air-layer to augment the gain of the antenna. The parameters of a fabricated prototype are measured for validation. Based on the measured data, the antenna is found to have an impedance bandwidth of 1189 MHz which is 18.46% of the centre frequency f 0 = 6.45 GHz. Also, the axial ratio (AR) bandwidth is 880 MHz centred at f AR = 6.54 GHz. The inter-port isolation ranges from 25 to 45 dB and the gain ranges from 8.2 to 9.5 dBic within the AR band. The antenna exhibits beam scanning capability and is therefore suitable for various applications like satellite communication, radiometry and polarimetry.

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A Wideband, Unidirectional Circularly Polarized Antenna for Full-Duplex Applications

Cited by 62 publications

References 27 publications

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

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

Characteristic-Mode-Based Design of Planar In-Band Full-Duplex Antennas

Dual circularly polarised travelling wave slot antenna array

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