Input impedance of concentric ring microstrip antennas for dual frequency band operation including surface wave coupling
作者:
N.S.Nurie,
R.J.Langley,
期刊:
IEE Proceedings H (Microwaves, Antennas and Propagation)
(IET Available online 1990)
卷期:
Volume 137,
issue 6
页码: 331-336
年代: 1990
DOI:10.1049/ip-h-2.1990.0061
出版商: IEE
数据来源: IET
摘要:
The impedance properties of a dual concentric annular ring microstrip patch antenna are described. This patch operates at two frequency bands which may be closely spaced. The TM12 mode is primarily investigated but other modes are also treated. An equivalent circuit model for the input impedance is presented together with experimental verification. Surface waves are found to be important even for very thin substrates and these are included in the model. Factors which influence the ring design are discussed.
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