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Mobile communications higher-order-mode microstrip antennas for road vehicle communications

✍ Scribed by Yasuhiro Kazama; Nagayoshi Morita; Shinobu Tokumaru

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
148 KB
Volume
84
Category
Article
ISSN
8756-6621

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✦ Synopsis

Abstract

Car antennas for road vehicle communications systems should be able to receive constantly the signals of beacon antennas at positions from just below the beacon antenna to a great distance along the road. In this paper, we restrict the discussion to the case of microstrip antennas and investigate what kind of patch shape is suitable for car antennas used in road vehicle communications systems. As a measure for evaluating the receiving power level, we define and use the “effective directivity,” which takes account of the distance between the beacon antenna and car antenna and the relative arrangement of both antennas. This effective directivity represents the effective received electric field intensity. We examine various patch shapes from the viewpoint that the desirable ones have constant effective directivity irrespective of car position. As a result, three types of simple‐structure higher‐order‐mode microstrip antennas are proposed. © 2001 Scripta Technica, Electron Comm Jpn Pt 1, 84(11): 54–60, 2001

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