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Abstract
A new single probe-fed, compact, dual-frequency antenna is studied, which is a rectangular microstrip patch with a rectangular slot cut in the center. The FDTD method is developed for full-wave analysis of its characteristics. A simple and accurate probe feed model is proposed, together with a simple method of calculating the radiation patterns. It is shown that through loading of the rectangular slot and proper location of the feed point, dual-frequency operations can be realized with an antenna-size reduction of ∼33% and further reductions are also possible by tuning the length and width of the slot and the patch. Electric current distributions on the rectangular patch for both the slot loaded case and the case without slot are given, together with the radiation patterns. Theoretical analysis is verified by experimental results.