This paper presents a broadband inverted F antenna realized by adding a wire element and describes a method for its design based on the operating principle. This inverted F antenna has a configuration with a wire element attached at the middle of the wire element already connected at the feed point. Broadband operation is made possible by a new method in which a parallel resonance antenna is combined with the wire inverted F antenna, which is a series resonance antenna. A design method is proposed in which matching at each resonant frequency is independently adjusted by means of these two different resonances. Its effectiveness is demonstrated by experiments and by a simulation by NEC2.
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Sekine et al. (2004) studied this question.
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