A theoretical study of a mulit-element scanning feed system for a parabolic cylinder

Assaly, R.N.; Ricardi, L.

doi:10.1109/tap.1966.1138742

Cited by 16 publications

(5 citation statements)

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“…High-gain multi-beam antennas [1][2][3][4][5][6][7][8][9] can provide multiple concurrent yet independent beams covering wide angular ranges. They can increase spectrum efficiency and reduce co-channel interference.…”

Section: Introductionmentioning

confidence: 99%

A broadband circularly polarized multi‐beam folded transmitarray antenna

Chen

et al. 2022

Int J RF Mic Comp-Aid Eng

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The multi‐beam reflectarray and transmitarray (TA) antennas are new antennas that can have wide angular coverage. However, they are generally of large profiles. To address the issue, this article proposes a folded TA antenna of high gain and low profile that can produce circularly polarized (CP) multi‐beams. It consists of a main‐reflector, a TA, and a linearly polarized (LP) planar feeding array. It reflects an incident electromagnetic wave twice and converts polarization three times. It has a metasurface that carries out the broadband LP‐to‐CP conversion. A prototype is developed with a height of 1.8λ at 13 GHz. The experimental results show that the antenna can achieve a scanning range of ±10°, a peak gain of 22 dBi, and an aperture efficiency of 20.8%. It has a 3‐dB axial ratio bandwidth of 2.2 GHz (or 16.6%), covering 12.1–14.3 GHz. It features a low profile, high gain, low cost, and easy integration with communication systems (e.g., MIMO transceiver systems).

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Section: Introductionmentioning

confidence: 99%

A broadband circularly polarized multi‐beam folded transmitarray antenna

Chen

et al. 2022

Int J RF Mic Comp-Aid Eng

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“…Early works on array-fed reflector antennas were implemented several tens of years ago in USA, United Kingdom and USSR, for example [1][2][3][4][5]. Afterwards, many constructions and models of array-fed reflector antennas and their parts as well as simulation procedures based on numerical algorithms were described in papers and books.…”

Section: Introductionmentioning

confidence: 99%

Asymptotic theory, design and efficiency of array-fed reflector antennas

Shishlov

Vilenko

Krivosheev

2013

2013 IEEE International Symposium on Phased Array Systems and Technology

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Asymptotic theory based on geometrical optics and physical optics is developed for 3D array-fed reflector antenna with an offset parabolic reflector. Relationships between parameters of the antenna structure and its performances are presented. Procedures of a feed array design and a cluster design are described. Radiation performances are simulated and discussed. Quality of the antenna with electrical beam steering is considered in terms of aperture efficiency and element use efficiency. Quality of the antenna with a contoured beam or multiple beams is proposed to describe in terms of coverage efficiency.

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“…Previous investigations on the use of array feeds to scan reflector antennas include those of Mrstik and Smith [1981], Assaly and Ricardi [1966], and Davis et al [1991]. It was shown by Assaly and Ricardi [1966] that an adequate number of array elements are needed to attain a decent beam quality of the considered parabolic cylindrical reflector. In the work of Mrstik and Smith [1981], a likewise parabolic cylindrical reflector fed by axially polarized line source feeds was treated, and the factors affecting the degradation of the main beam and sidelobe levels were characterized.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of dense focal plane array feeds for parabolic reflectors in achieving closely overlapping or widely separated multiple beams

Kehn

Shafai

2009

Radio Science

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[1] In the advent of modern mobile satellite communications requiring rapid and adaptive multiple beams, this work studies the ability of reflector antennas fed by dense focal plane arrays (FPA) in achieving arbitrarily shaped and sized footprints to meet the demands. In this paper, the efficiencies of single off-axis as well as multiple beams of FPA-fed paraboloids are investigated. The offset FPA considered here comprises hard rectangular waveguides. The focal plane field, which the FPA samples, is synthesized by integration of the physical optics induced electric currents over the reflector surface caused by the off-axis incident plane wave arriving at that incidence angle of interest. Full mutual coupling analysis has been performed in the FPA sampling, thereby taking into account mutual coupling losses in the arrays. The fields over the tilted elliptical aperture of off-axis beams needed for calculation of the aperture efficiency are obtained by projecting the usual focal plane fields to this tilted aperture using geometrical optics. Results show that the total efficiency of the offset FPA-fed reflector decreases with increasing beam angle and increases with larger number of FPA elements. It is also found that the maximum directive gain of the reflector radiation patterns falls noticeably with beam angle when the FPA population is low, but the directivity can be maintained well when an adequate number of FPA elements are used. Multiple beams that are either closely overlapping or widely separated are also successfully investigated.Citation: Ng Mou Kehn, M., and L. Shafai (2009), Characterization of dense focal plane array feeds for parabolic reflectors in achieving closely overlapping or widely separated multiple beams, Radio Sci., 44, RS3014,

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A theoretical study of a mulit-element scanning feed system for a parabolic cylinder

Cited by 16 publications

References 0 publications

A broadband circularly polarized multi‐beam folded transmitarray antenna

A broadband circularly polarized multi‐beam folded transmitarray antenna

Asymptotic theory, design and efficiency of array-fed reflector antennas

Characterization of dense focal plane array feeds for parabolic reflectors in achieving closely overlapping or widely separated multiple beams

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