AbstractCharacteristics of a single‐layer, multi‐frequency microstrip patch antenna, which uses a Sinc shaped microstrip patch configuration, are studied. This antenna is capable of providing good impedance matching at all frequencies without tuning the feed position and other design parameters. A parametric study is conducted using commercial software IE3D, based on method of moments (MoM) algorithm. The effects of various antenna parameters on resonant frequencies of the antenna are analyzed and discussed. Similar radiation patterns are obtained at three resonant frequencies. A prototype with dimensions based on the simulations is built and tested. A comparison between the measured and simulated results shows good agreement. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1673–1675, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22541