A Highly Integrated Antenna-Triplexer With Simultaneous Three-Port Isolations Based on Multi-Mode Excitation

Cheong, Pedro; Chang, Ka-Fai; Choi, Wai‐Wa; Tam, Kam‐Weng

doi:10.1109/tap.2014.2364299

Cited by 68 publications

(33 citation statements)

References 20 publications

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“…It can offer a good rejection to noise, especially for those adjacent to those desired frequency bands. Moreover, an antenna-triplexer is designed and the prototype obtains good matching at the harmonic frequencies [31]. The measured antenna gains of 0.85, 4.00, and 4.23 dBi are realized and the port isolations are better than 20 dB, respectively.…”

Section: A Experimental Setup and Link Budget Estimationmentioning

confidence: 99%

Nonlinear Communication System With Harmonic Diversity

Cheong

Tam

2015

IEEE Trans. Microwave Theory Techn.

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This paper presents the concept and demonstration of harmonic diversity for wireless communication, which makes use of multiple harmonic radio frequency (RF) channels with respect to the carrier frequency. Rather than frequency and space diversities widely used today to improve multipath fading, signal quality and spectral efficiency, the proposed scheme does not require multiple RF transceiver front-ends. The advantages of inherent RF device nonlinear characteristics are harnessed to produce and process harmonics within single transceiver. Even though distinct harmonic channels will exhibit different order of phase shifts, the analysis shows that such phase offsets can be compensated by adjusting the phase of local oscillator (LO) at receiver end. Extending the framework of the Shannon theorem, an -channel harmonic communication system is shown to reduce the minimum required signal-to-noise ratio (SNR) at the input of receiver by -times. In addition, this work indicates that the power consumption of transmitter can be significantly reduced up to 66% than the conventional ones. Through the analysis of channel capacity, the harmonic system is proved to outperform the single channel counterpart especially when SNR is low. To validate the correctness of the proposed concept, a series of experiments are carried out to emulate the developed theoretical models. For instance, a three-channel harmonic communication system is prototyped, involving certain RF harmonic components designed for demonstration. The retrieved signal strengths are examined with different phase setting of receiving LO, and various modulation techniques are applied for estimating the system performances. All measured results are in agreement with their simulated counterparts, thereby demonstrating the correctness and usefulness of the proposed theories and techniques for nonlinear communication systems of harmonic diversity.

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Section: A Experimental Setup and Link Budget Estimationmentioning

confidence: 99%

Nonlinear Communication System With Harmonic Diversity

Cheong

Tam

2015

IEEE Trans. Microwave Theory Techn.

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“…Khan and Mandal describe a planar diplexer using transmission zeros of the dual‐mode cavity filter which gives improved isolation value . Cheong et al implemented a highly integrated triplexer based on multimode excitations having even, odd and bidirectional mode provides better isolation among the input ports; but the gain parameter is not much satisfactory . Rajo‐iglesias presents a multilayer structure included an electromagnetic band gap (EBG) structure patch antenna for dual frequency applications using proximity feed coupling that gives high isolation and low cross‐polarization at both frequencies band .…”

Section: Introductionmentioning

confidence: 99%

Substrate integrated waveguide based cavity‐backed self‐triplexing slot antenna for X‐Ku band applications

Nigam

Agarwal

Muduli

et al. 2020

Int J RF Microw Comput Aided Eng

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A planar substrate integrated waveguide (SIW) based cavity‐backed self‐triplexing slot antenna is proposed for X‐Ku band applications. The antenna comprises of the SIW cavity, radiating slots, and feeding networks. The radiating slots; that are etched on the upper metallic plane of the SIW, are backed up by the three radiated quarter cavities (QCs). The radiating slots in the respective QCs are of different lengths, excited by three separated orthogonal feed lines to resonate at three different frequencies as 11.01, 12.15, and 13.1 GHz. By fine‐tuning the antenna parameters, an intrinsic input port isolation of better than 26 dB is realized which helps in achieving the self‐triplexing property. The behaviors of individual cavity modes at three resonant frequencies are explained with the help of Z‐parameter. The proposed antenna layout is easy to integrate with the planar circuit. The proposed antenna is fabricated and measured results display a close concern with the simulated results. Moreover, a unidirectional radiation pattern and gain of 5.1, 5.54, and 6.12 dBi at resonant frequencies are realized.

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“…Several planar duplex antennas with compact sizes have been reported in literature. These can be realized by two cascaded triplet sections of quarter wavelength resonators [1], by coupling electromagnetic (EM) waves through dog-bone-shape slotted ground [2], or by microstrip-to-slot transition technique [3], to name just a few. T-shaped probes presented in [4] acted as a two-pole band-pass filter (BPF) in a duplex patch antenna, whereas two H-shaped feed-lines aided in achieving a quasi-elliptic BPF in [5].…”

Section: Introductionmentioning

confidence: 99%

A Ku-Band Filtering Duplex Antenna for Satellite Communications

Aly¹,

Mao²,

Gao³

et al. 2019

PIER M

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In this paper, a dual-polarisation shared-aperture duplex antenna is presented for satellite communications at the standard microwave Ku-band, based on the integrated filtering-antenna concept and co-design approach. The design relies on the use of resonators coupled to the radiating dual-band dual-polarisation antenna. The resonant patch antenna forms one pole of each channel filter, resulting in a third-order filter in the Rx channel and a second-order filter in the Tx channel. The Rx and Tx ports of the antenna take in horizontal and vertical linear polarisations, respectively. The integrated duplexer helps to increase the isolation between the ports and the selectivity of each channel. The integration between the filter and the antenna is achieved by electromagnetic coupling, without the need of external matching circuits. Thus it attains a compact footprint. The operation frequencies of the demonstrated duplex antenna are from 11 to 12.5 GHz (12.8%) for the downlink to the Rx port, and from 13 to 14.4 GHz (10.2%) for the uplink at the Tx port. High port-to-port isolation of over 40 dB is realized to reduce channel interference. Flat in-band average gains are achieved to be 7.8 and 8.3 dBi, for the low-and high-bands, respectively.

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A Highly Integrated Antenna-Triplexer With Simultaneous Three-Port Isolations Based on Multi-Mode Excitation

Cited by 68 publications

References 20 publications

Nonlinear Communication System With Harmonic Diversity

Nonlinear Communication System With Harmonic Diversity

Substrate integrated waveguide based cavity‐backed self‐triplexing slot antenna for X‐Ku band applications

A Ku-Band Filtering Duplex Antenna for Satellite Communications

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