A Beam Tilt Dipole Array Antenna for Indoor Mobile Applications

Koichi OGAWA  Tomoki UWANO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E79-C    No.5    pp.685-692
Publication Date: 1996/05/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave Devices for Mobile Communications)
Category: Passive Devices
Keyword: 
beam tilt,  sector beam,  dipole array antenna,  indoor base station,  

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Summary: 
A new beam tilt dipole array antenna in a simple structuer has been developed for indoor base stations in the 1.9 GHz band. The antenna comprises a radiator and skewed off-center parasitic elements placed around the radiator. With this stucture, the main beam of the array antenna can be tilted for mobile terminals reception by the effect of mutual coupling. Studies on tilt characteristics for antenna dimensions and tilt mechanism by precise current measurements have clarified the operating principle. The antennas with a fan beam and an omnidirectional pattern have been designed. The measured tilt angle was varied in the range of 0 to 26 with little alteration of the horizontal radiation patterns.