期刊
ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS
卷 85, 期 9, 页码 1-12出版社
SCRIPTA TECHNICA-JOHN WILEY & SONS
DOI: 10.1002/ecja.1120
关键词
Luneberg lens; hole density; multifunction; planar antenna; millimeter waves
The Luneberg lens enables easy beam scanning and has the possibility of multibeam forming. In order to apply these characteristics to a planar antenna, it is first necessary to discuss a method of fabrication for a thin-plate Luneberg lens. On the other hand, there is a method of controlling permittivity whereby many holes having diameters sufficiently smaller than the wavelength are created in the di-electric material. Permittivity control by the hole density has been used as a method of adjusting the permittivity over a wide range in order to realize a matching layer for the lens, by creating many holes in the direction perpendicular to the incident electric field or close to this direction. In contrast, the authors propose a method for adjusting the permittivity over a wide range by creating multiple holes parallel to the electric field. By means of the hole density method, a Luneberg lens is fabricated. The operating characteristics are determined at 10 and 48 GHz. It is confirmed that the structure works well as a Luneberg lens at both frequencies. Further, as an example of the applications of the plate Luneberg lens, a parallel plate slot array antenna is fabricated and its radiation characteristics are measured. It is found that the Luneberg lens can be applied as the feed section of a high-gain millimeter-wave planar antenna with a beam scanning capability. (C) 2002 Wiley Periodicals, Inc.
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