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A simplified probe feed input impedance for a rectangular patch antenna based on the Green's function is used to design a dual frequency matched antenna. The predicted results at design frequencies of 1.9 and 2.4 GHz are in close agreement with experimental measurements. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1161–1164, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24294