摘要:

A simple theory is developed for the analysis of microstrip patch elements which are loaded at one or more points with lumped linear load impedances. The analysis is based on a cavity model in which the shape of the field distribution between the patch and ground plane is assumed to be well approximated by that of the resonant modes of a corresponding magnetic- and electric-walled cavity. The resonant mode of the loaded cavity is represented as an appropriate superposition of the modes of the corresponding unloaded cavity. The characteristic equation for the resonant frequencies of the loaded cavity is obtained in terms of the load impedances and the unloaded cavity multiport open-circuit parameters. An analysis of the input impedance of a rectangular microstrip element shorted at an arbitrary point has been implemented and the results show good agreement with experiment. An ancilliary result showing the equivalence between a thin strip and a circular cylinder model of a feed current distribution is also obtained.

ISSN:0272-6343    

DOI:10.1080/02726348308915194

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

An improved theory for the input impedance of a probe-fed microstrip patch antenna has been developed. The natural modes are established on a transverse resonance condition which incorporates the angularly dependent reflection coefficients and a dynamic wall susceptance associated with the patch boundaries. The input reactance is shown to be largely associated with the evanescent waves confined to the vicinity of the probe while the input resistance is associated with the excitation of the mode at resonance. Analytical results are presented to describe the input impedance of a rectangular patch antenna as a function of its dimensions, substrate thickness and dielectric constant, probe dimensions and location and the frequency.

ISSN:0272-6343    

DOI:10.1080/02726348308915195

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor