Experimental fixed and mobile multibeam satellite communications system

Tanaka, Masayoshi; Nakamura, Makoto; Kikuchi, Makoto; Ohtomo, Isao

doi:10.1109/icc.1989.49945

Cited by 19 publications

(5 citation statements)

References 11 publications

(1 reference statement)

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“…1 [9]. The main feature of this configuration is its ability to make effective use of satellite power even when traffic varies among beams or over time.…”

Section: Configuration and Operation Principle Of A Multibeam Payloadmentioning

confidence: 98%

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Linearity degradation due to beam coupling in a multibeam mobile satellite communications system

Tanaka

Yamamoto

1999

Electron. Comm. Jpn. Pt. I

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This paper proposes a method for analyzing repeater characteristics in a multibeam mobile satellite communications system in which beam coupling occurs. It also presents theoretical studies on the effects of adjacent‐beam signals and on the relationship between traffic distribution and change in repeater linearity. It is found that the effects of signals leaked from adjacent beams, which up to now have been considered small, cannot be ignored; they depend on traffic distribution and play a role in linearity degradation and decreased maximum transmission capacity. Based on these studies, new methods are proposed for designing, configuring, and operating a system so that transmission capacity can be increased. © 1999 Scripta Technica, Electron Comm Jpn Pt 1, 82(5): 1–15, 1999

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“…1 [9]. The main feature of this configuration is its ability to make effective use of satellite power even when traffic varies among beams or over time.…”

Section: Configuration and Operation Principle Of A Multibeam Payloadmentioning

confidence: 98%

“…The configuration and operation principle of the multibeam payload for mobile communications targeted by this paper is shown in Fig. 1 [9]. The main feature of this configuration is its ability to make effective use of satellite power even when traffic varies among beams or over time.…”

Section: Configuration and Operation Principle Of A Multibeam Payloadmentioning

confidence: 99%

Linearity degradation due to beam coupling in a multibeam mobile satellite communications system

Tanaka

Yamamoto

1999

Electron. Comm. Jpn. Pt. I

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“…In the satellite mobile communication systems, the multibeam also effectively increases the signal power flux density of the earth station by narrowing the beamwidth pattern. The increase of signal power flux density has an advantage, where the transmission capacity can be increased; thus, it can reduce the earth station size and be more economical [7]. For mobile earth and telecommunication base stations, conventional feed radiators such as horn, dipole, and phased array antennas have been used in the previous generation of mobile technology.…”

Section: Introductionmentioning

confidence: 99%

Design of Bifurcated Beam using Convex Bent Array Feed for Satellite Mobile Earth Station Application

Tengah¹,

Rahman²,

Yamada³

et al. 2022

RADIOENGINEERING

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For multibeam operation at the satellite mobile earth station and telecommunication base stations, a cylindrical lens antenna with multi-feed is a promising candidate due to the simple antenna configuration and good scanning performance to produce multi beams. However, efficient illumination at the lens surface is critical. Previously, the present antennas were used; however, a significant tapered distribution is observed, resulting in underillumination at the lens edges. The feed positions are requested to be placed near the lens to achieve a slender lens form. Therefore, the feed radiation pattern should have high radiations at the wide-angle region. This paper proposes a bifurcated beam array antenna to alter the amplitude distribution. This method is expected to improve the radiation pattern coverage area. In designing a bifurcated beam antenna, the important parameter is to ensure that the separated beams have the same current phase excitations at each radiating element and a precise patch arrangement to achieve the targeted radiation pattern. The differences in surface current will affect the radiation patterns due to the significant interference and cancellation effects which will contribute to high losses. This paper forms the array by a convex bent array with the same phase excitation for all patch elements. The feed performances are also verified by the good agreement between simulated and measured results. An improved aperture distribution is demonstrated for array feed having 0.7λo spacing compared to the tapered distribution by a single patch design with the hyperbolic lens through detailed analysis and comparative study. By changing the spacing distance of the convex bent array, many radiation patterns are observed, such as strong radiation in the wide-angle region, the uniform radiation level in a wide-angle region, and the tapered radiation pattern. Thus, many aperture distributions of center-dip, uniform and tapered, are achieved.

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“…Degradation of beam isolation due to variation among HPA characteristics 2,3 , HPA arrangement methods that effectively improve beam isolation 4,5 , and a reliable configuration 6 have been investigated. Some MPAs have already been employed in commercial satellite mobile communications services [7][8][9] , and further developments are being made toward delivering higher output power and utilizing higher frequency bands 10 .…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Distortion Analysis of Multiport Amplifier

Tanaka¹,

Suzuki²

2004

22nd AIAA International Communications Satellite Systems Conference &Amp; Exhibit 2004 (ICSSC)

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This paper presents an analysis of nonlinear distortion generated in Multi-Port-Amplifier (MPA) systems that have attracted considerable attention for their potential use in multi-beam mobile satellite communications. The MPA configuration is a special one composed of a power divider, a power combiner and an array of high power amplifiers (HPAs). The HPA nonlinear characteristics degrade the MPA linearity. Intermodulation (IM) products generated by this nonlinearity cause interference with signals and degrade the signal transmission performance. We investigated the dominant third-order IM (IM3) performance of an MPA under HPA nonlinear operations by taking the specific properties of the MPA configuration into account and showed that it was possible to improve the carrier level to a third-order IM (C/IM3) ratio by properly assigning multiple carriers to multiple MPA ports without adding any additional circuits. Based on these results, we proposed an amplifier system immune to IM3 interference and a frequency assignment method effective in improving the C/IM3 ratio in an MPA system. The analysis and our proposed system will help make it possible to construct a power-efficient satellite system with a simple configuration not only for multibeam mobile communications but also for other uses.

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Experimental fixed and mobile multibeam satellite communications system

Cited by 19 publications

References 11 publications

Linearity degradation due to beam coupling in a multibeam mobile satellite communications system

Linearity degradation due to beam coupling in a multibeam mobile satellite communications system

Design of Bifurcated Beam using Convex Bent Array Feed for Satellite Mobile Earth Station Application

Nonlinear Distortion Analysis of Multiport Amplifier

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