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Analysis and design of broad-band single-layer rectangular U-slot microstrip patch antennas

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4 Author(s)
Weigand, S. ; Tech. Univ. of Darmstadt, Germany ; Huff, G.H. ; Pan, K.H. ; Bernhard, J.T.

A wide operating bandwidth for a single-layer coaxially fed rectangular microstrip patch antenna can be obtained by cutting a U-shaped slot on the patch. This antenna structure has recently been found experimentally to provide impedance bandwidths of 10%-40%, even with nonair substrates. However, design rules for this antenna have not yet been presented. This paper develops principle design procedures through examination of the structure's multiple resonant frequencies as well as the radiation and impedance properties of different antenna geometries. The approximate design rules are derived by analysis of former experiments, method of moments (MoM) simulations, and measurement results. Simulations and measurements of several antennas designed using these new rules are presented and directions for further study are discussed.

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Antennas and Propagation, IEEE Transactions on  (Volume:51 ,  Issue: 3 )