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Analysis and equivalent circuit of aperture‐coupled cavity‐fed microstrip patch antenna

A simple but accurate equivalent circuit of an aperture‐coupled cavity‐fed microstrip patch antenna is developed. It consists of ideal transformers, admittance elements, and transmission lines, and the related circuit‐element values are computed by applying the reciprocity theorem and complex power concept with the spectral‐domain immittance approach. The antenna input impedance calculated from network theory is compared with the measured data, and their good agreement validates the simplicity and accuracy of the proposed equivalent‐circuit model. Based on the proposed theory, the effect of structural parameters on the antenna characteristics is also examined. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 843–846, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21493