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논문 기본 정보

자료유형
학술저널
저자정보
Takeshi Fukusako (Kumamoto University)
저널정보
한국전자파학회JEES Journal of Electromagnetic Engineering And Science Journal of Electromagnetic Engineering And Science Vol.17 No.1
발행연도
2017.1
수록면
1 - 8 (8page)

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초록· 키워드

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This paper introduces a technique to obtain the broadband characteristics of circularly polarized antennas using an L-shaped probe. A
waveguide antenna is suitable for obtaining high gain and handling convenience in some applications; however, the asymmetrical structure of the L-shaped probe results in cross-polarization and frequency dependence on the field distribution of higher-order modes (HOM). In addition to the basic characteristics of a waveguide antenna with an L-shaped probe, the author discusses some techniques to reduce the HOM and cross-polarization. As a result, the 3-dB axial ratio (AR) is obtained with the fundamental mode even when the frequency is expanded to the region for HOM of TM. This reduction is mainly due to the cutoff structure to the TM mode around the short wall of the waveguide. Furthermore, some aperture modification techniques can reduce the cross-polarization in a wide range of angles in the radiation pattern. Such techniques and their mechanisms are discussed in this paper. The obtained performance shows that the proposed antennas have a wide range of angles of 3-dB AR in the radiation pattern, broadband characteristics in impedance and AR, and low variation in group velocity.

목차

Abstract
Ⅰ. INTRODUCTION
Ⅱ. REDUCTION OF HIGHER-ORDER MODES
Ⅲ. ENHANCEMENT OF AR BANDWIDTH AND ANGLE OF CP RADIATION
Ⅳ. SUPPRESSION OF CROSS-POLARIZATION OVER A WIDE RANGE OF ANGLES
Ⅴ. CONCLUSIONS
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