NDLI: An annular-ring microstrip antenna fed by a co-planar feed circuit for mobile satellite communication use

Content Provider	IEEE Xplore Digital Library
Author	Ohmine, H. Sunahara, Y. Matsunaga, M.
Copyright Year	1963
Abstract	A new configuration of circularly polarized annular-ring microstrip antenna (ARMSA) fed by a branch-line hybrid coupler placed at the inner part of the ARMSA and its design method using an equivalent circuit are presented. Since the ARMSA has a narrow bandwidth and high-input impedance, a parasitic element placed above the ARMSA is employed for not only obtaining a broadband characteristic, but decreasing the input impedance down to 50 /spl Omega/. A hybrid coupler to generate circular polarization, therefore, can be connected to the co-planar space of the ARMSA directly without a large-size matching circuit and a very low profile and simple structure can be achieved. The ARMSA is excited at the TM/sub 21/ mode to produce a conical pattern, which has a high gain in a low-elevation angle for mobile satellite communications. An effective design method using the equivalent circuit is indicated and, as a result, it is obvious that a broadband characteristic is obtained when each resonant frequency of the ARMSA and parasitic element is identical. Experimental results in the L-band showed satisfactory characteristics for vehicle antennas.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	1001
Ending Page	1008
Page Count	8
File Size	414521
File Format	PDF
ISSN	0018926X
Volume Number	45
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Microstrip antennas Antenna feeds Polarization Coupling circuits Design methodology Equivalent circuits Impedance Microstrip components Bandwidth Hybrid power systems
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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