V-shaped diversity antenna for microcell station

In microcell systems such as PHS in which the antenna height is low and the cell radius is small, many antennas are installed on the street so that they are easily seen. Hence, the antenna shapes must be adapted to the aesthetics of urban areas. Also, the handsets are often used indoors, so that the...

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Bibliographic Details
Published in:Electronics & communications in Japan. Part 1, Communications Communications, 2005-03, Vol.88 (3), p.11-20
Main Authors: Komai, Tomohiro, Hori, Toshikazu, Cho, Keizo, Yamamoto, Heiichi, Okada, Minoru
Format: Article
Language:English
Subjects:
diversity
microcell
street cell
V shape
wireless antenna
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Summary:In microcell systems such as PHS in which the antenna height is low and the cell radius is small, many antennas are installed on the street so that they are easily seen. Hence, the antenna shapes must be adapted to the aesthetics of urban areas. Also, the handsets are often used indoors, so that the radio waves reach the antenna after several reflections by buildings, and many cross polarization components are present. As an optimum diversity antenna taking account of such propagation characteristics, a bar‐shaped diversity antenna of V shape is proposed. In this paper, based on an analysis of the antenna radiation characteristics by the method of moments and simulation of the diversity effect, a configuration of a V‐shaped diversity antenna suitable for microcell systems is demonstrated. The antenna gain is improved in the direction of antenna inclination. Since many cross polarization components are contained in urban propagation, the diversity effect considering this situation is clarified. It is found that the diversity gain exceeds that for the conventional collinear antenna and that an improvement of more than 3 dB can be attained with a diversity reception level of 1%. Hence, the characteristics are found to be suitable for street microcell configurations. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 88(3): 11–20, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20179
ISSN:8756-6621
1520-6424
DOI:10.1002/ecja.20179