Leaky wave enhanced feed arrays for the improvement of the edge of coverage gain in multibeam reflector antennas

被引:51
作者
Llombart, Nuria [1 ]
Neto, Andrea [1 ]
Gerini, Giampiero [1 ]
Bonnedal, Magnus [2 ]
De Maagt, Peter [3 ]
机构
[1] Netherlands Org Appl Sci Res TNO, NL-2597 AK The Hague, Netherlands
[2] Saab Ericsson Space, Gothenburg, Sweden
[3] European Space Agcy, Div Electomagnet, NL-2200 AG Noordwijk, Netherlands
关键词
leaky wave antennas; leaky waves; reflector antenna feeds; reflector antennas;
D O I
10.1109/TAP.2008.922680
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
The performance of multibeam focal plane arrays feeding a single aperture is usually reduced due to conflicting requirements on the feed elements. Dense packing is usually required to minimize the beam separation, while typically large feed apertures are needed to provide the high feed directivity to reduce spillover losses from the reflector. In this paper the use of dielectric super-layers to shape the radiation pattern of each feed is demonstrated. The shaping is obtained by exciting, according to design, a pair of TE/TM leaky waves. The spillover from the reflector is reduced without physically increasing the dimensions of each single element aperture. A prototype of a feed array composed of 19 waveguides arranged in a hexagonal lattice was designed, manufactured and tested. The measured embedded patterns provided an increase of the edge of coverage gain, with respect to the free space case, of at least 0.6 dB in an operating bandwidth (BW) of approximate to 12%. Moreover when reactive loading of adjacent feeds is adopted the increase in the edge of coverage with respect to the free space case was demonstrated to be larger than 1.6 dB over a 3% BW.
引用
收藏
页码:1280 / 1291
页数:12
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