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It is shown theoretically and experimentally that a multifrequency dipole antenna can be realized by placing parasitic elements close to an excited element. Numerical data for two‐frequency and five‐frequency operations are presented. In the theoretical analysis, current distribution along both the excited and parasitic elements are calculated, and it is verified that large density current is induced on the parasitic element, as well as on the excited element. It is also shown that the length of a parasitic element should be less than about 1/1.2 of the excited element to realize a new resonant frequency. Calculated results of the radiation pattern in the horizontal plane are also presented.

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