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Closed‐form expressions for computation of mutual admittance of a class of gap‐coupled circular microstrip antennas
Author(s) -
Chakravarty T.,
Khah Sunil K.,
De Asok
Publication year - 2008
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.23251
Subject(s) - admittance , scattering parameters , admittance parameters , microwave , microstrip , computation , coupling (piping) , topology (electrical circuits) , electronic engineering , engineering , physics , scattering , mathematical analysis , electrical impedance , mathematics , electrical engineering , optics , telecommunications , voltage , algorithm , mechanical engineering
Abstract In this paper, a new set of expressions are presented, which leads to accurate estimation of the mutual admittance and mutual coupling thereof for gap‐coupled circular microstrip antennas. Unlike previous works, the field expressions for both the patches are obtained with respect to one coordinate system, and the circuit theory is used to obtain the admittance parameter. When this mutual admittance is converted to scattering parameters, we obtain the magnitude of mutual coupling. The results presented in the standard literature are compared with those obtained through the present formulation and the accuracy obtained is reasonably good. The method is also extended to incorporate the effects of shorting pins at the center of the two patches. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 924–927, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23251