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The growing demand of electronic products employing several wireless standards for data exchange, working in different frequency bands, requires the adoption of multi-band components and devices. In this framework one of the most critical issue is the design of the radiating device since the development of a single antenna working in two or more frequency bands and belonging to a limited geometry is, in general, an hard task. Wire antennas (basically dipoles and monopoles) can work in several frequency bands corresponding to the resonances of the structure, but multiple working frequencies are strictly linked by harmonic relationships and, in addition, their electrical performances (VSWR and gain) vary with the considered resonant frequency.
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