A TM21 Mode Annular-Ring Microstrip Antenna for Personal Satellite Communication Use

Hiroyuki OHMINE  Yonehiko SUNAHARA  Makoto MATSUNAGA  

IEICE TRANSACTIONS on Communications   Vol.E79-B   No.9   pp.1227-1233
Publication Date: 1996/09/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Personal Communications)
Category: Antenna and diversity techniques
antennas and propagation,  satellite communication,  annular-ring microstrip antenna,  vehicle antenna,  circular polarization,  axial ratio,  geometrical theory of diffraction,  

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This paper presents a configuration of circularly polarized annular-ring microstrip antenna (ARMSA) and its design method to obtain high gain and low axial ratio including the analysis of finite ground plane effect using G.T.D. for personal satellite communication use. The ARMSA excited at TM21 mode through co-planar branch-line hybrid coupler for circular polarization produces a conical pattern which has high gain in low elevation angle. The relation of gain and axial ratio versus the dielectric constant of substrate are shown and the existence of the dielectric constant which satisfies two requirements, that is, high gain and low axial ratio are clarified. For car-top application, experimental results in the L-band showed satisfactory characteristics for vehicle antenna.