Generating Contoured Beams for Malaysia Region by Using a Caustic Locus Graph

被引：6

作者：

Abd Rahman, N. H. ^{[1
,2
]}

Islam, M. T. ^{[1
]}

Misran, N. ^{[1
]}

Yamada, Y. ^{[3
]}

Michishita, N. ^{[4
]}

机构：

[1] Univ Kebangsaan Malaysia, Fac Engn & Built Environm, Ukm Bangi 43600, Selangor, Malaysia

[2] Univ Teknol MARA, Fac Elect Engn, Shah Alam 40450, Selangor, Malaysia

[3] Univ Teknol Malaysia Kuala Lumpur, Malaysia Japan Int Inst Technol, Kuala Lumpur 54100, Malaysia

[4] Natl Def Acad, Yokosuka, Kanagawa 239, Japan

来源：

IEEE ANTENNAS AND PROPAGATION MAGAZINE | 2014年 / 56卷 / 06期

关键词：

Reflector antennas; satellite antennas; antenna feeds; ray tracing; microstrip antenna arrays; caustic; DESIGN; ANTENNAS;

D O I：

10.1109/MAP.2014.7011080

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

It is very important to achieve precisely contoured beams in satellite-communication applications. For the case of Malaysia, separate contoured beams for the peninsular (West Malaysia) and Borneo (East Malaysia) regions must be achieved. For this purpose, the calculation of accurate feed positions in widely distributed feed areas is considered one of the critical aspects in designing a contoured-beam antenna system. Although some equations for precise feed positions have been proposed in previous papers, a graphical expression for the feed positions seems more convenient. In this paper, firstly, several trials to achieve a universal feed-position graph that is applicable for any antenna's f/D (focal-length-to-diameter ratio) and any beam direction were conducted. For this purpose, receiving-mode ray tracings were performed for various f/D values and beam directions in MATLAB. The accuracy of the universal feed-position graph was verified through radiation-pattern calculations by using the FEKO electromagnetic solver. Based on the proposed graph, the positions of the array elements for array feed configurations for the peninsular and Borneo regions were next determined. For the array feed, through observation of the calculated contoured beams by electromagnetic simulations, the optimum excitation coefficients of each radiating element were determined. Finally, excellent contoured beams were ensured through electromagnetic simulations.

引用

页码：328 / 336

页数：9

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