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This paper presents calculated and measured results for the input impedance and radiation performance of probefed printed annular ring antennas. Geometries featuring stacked rings as well as shorting posts are considered. A numerical model is presented that is based on a full-wave spectral-domain momentmethod solution. In this solution, a specialized attachment modeexpansion function is used to model the connection between the probe feed and the printed ring. Measured results are presented and compare well with the theory. Annular rings are found to have certain advantages over circular and rectangular microstrip antennas.Index Terms-Microstrip antennas.

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