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This paper describes how to design an electromagnetic band gap (EBG) resonator antenna to radiate directive patterns for multiple frequencies. The principle is explained and applied to a GSM/DCS antenna. A prototype which is smaller than the GSM/DCS antenna for ease of manufacture, is realized. The operating frequencies are 4.2 GHz and 7.4 GHz.
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Leger et al. (2004) studied this question.
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