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（好文章）Impedance matching of a dual-frequency microstrip antenna with an air gap680

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 41, NO. 5, MAY 1993

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141 T. A. C. M. Claasen and W. F. G. Mecklenbrauker, “The Wigner distria r t I: Continuousbution-A tool for time-frequency signal analysis; P time signals,” Philips J. Res., vol. 35, no. 3, pp. 217-250, 1980. IS] D. Gabor, ‘Theory of communication,” J. Insr. Elec. Eng., vol. 93, pp. 429-441. 1946.

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Impedance Matching of a Dual-Frequency Microstrip Antenna with an Air Gap

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Choon Sae Lee and Vahakn Nalbandian
Abstract-A novel microstrip antenna has been proposed to operate at dual frequencies. The microstrip is a single layer patch with nonradiating edges closed with a conducting foil. Resonant frequencies are altered by varying the air gap under the patch. The separation o