Advances in multibeam communications satellite antennas

Zaghloul, Amir I.; Hwang, Y.; Sorbello, R.; Assal, F.

doi:10.1109/5.56934

Cited by 33 publications

(12 citation statements)

References 22 publications

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“…Base on the above assumptions, the composite field can be represent by (1) where is the field of the central spot beam, whose center is located at the origin. Performing continuous Fourier transform on the both sides of (1), it follows that (2) (2), it is clear that the spectrum of the composite field is the product of the spectrum of the excitation sequence and that of the field of the central spot beam . Different from the well-known spatial principle of pattern multiplication [10], this relation can be referred to as frequency-domain principle of pattern multiplication.…”

Section: A Rectangular Array Casementioning

confidence: 99%

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Frequency-domain principle of pattern multiplication for array-fed reflector or lens antennas

Zhang

Wang

2004

IEEE Microw. Wireless Compon. Lett.

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In this letter, array-fed reflector or lens antennas are proven by using Fourier analysis methods to follow a kind of frequency-domain principle of pattern multiplication, which states that the spectrum of the composite field of such an antenna is the product of the spectrum of the far field of the individual spot beam and that of the excitation coefficient sequence. This principle will provide a useful and efficient tool not only for determining the optimum excitations but also for predicting the antenna performance.Index Terms-Fourier transform, principle of pattern multiplication, satellite communication, shaped-beam antenna.

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Section: A Rectangular Array Casementioning

confidence: 99%

“…F OR SATELLITE antennas, one of the attractive, feasible ways to realize a shaped beam with a fixed or variable pattern is by using array-fed reflector or lens antennas [1], [2]. Such an antenna generally consists of a parabolic reflector or a lens, a closely packed feed array and a beamforming network.…”

Section: Introductionmentioning

confidence: 99%

Frequency-domain principle of pattern multiplication for array-fed reflector or lens antennas

Zhang

Wang

2004

IEEE Microw. Wireless Compon. Lett.

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“…These antennas provide high-gain in a specified field-of-view [1] [2]. A common MBA is a reflector or lens illuminated by an array of feeds.…”

Section: Introductionmentioning

confidence: 99%

Multi-Beam Antenna with enhanced Wavelength-Scaled Log Periodic Dipole Array feeds

Yang

Ouyang

2011

2011 IEEE International Symposium on Antennas and Propagation (APSURSI)

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A circular polarized Multi-Beam Antenna (MBA) with 3:1 bandwidth is described. The enhanced Log Periodic Dipole Array (LPDA) feeds are used to enlarge MBA's 27dB coverage region and improve antenna's maximal gain. The Wavelength-Scaled Array (WSA) is applied to restrain gating lobes. Compared with the single LPDA feed, the 27dB coverage region of this antenna is much lager and the maximal gain is about 3dB higher.

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“…The constantly rising demand for increased capacity and enhanced performance of both commercial as well as military communications has led to continuous evolution of the technology. Satellite systems today provide services not only for aircrafts, ships, and land mobiles, but also for personal communications [ Brisken et al , 1979; Zaghloul et al , 1990; Wu et al , 1994]. The applications include navigation, positioning [ Sakagami et al , 1992], communications, tracking [ Jacobs et al , 1991; Densmore and Jamnejad , 1993], range determination [ Brisken et al , 1979], targeting, air traffic control, automated landing [ Wu et al , 1994], and remote sensing, among many others.…”

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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Advances in multibeam communications satellite antennas

Cited by 33 publications

References 22 publications

Frequency-domain principle of pattern multiplication for array-fed reflector or lens antennas

Frequency-domain principle of pattern multiplication for array-fed reflector or lens antennas

Multi-Beam Antenna with enhanced Wavelength-Scaled Log Periodic Dipole Array feeds

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

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