An antenna radiating element capable of providing a broadband VSWR response and unidirectional radiation patterns over nearly an octave bandwidth is described. The basic radiating element consists of a balun-fed dipole with one or more parasitic elements (sleeves) added. Addition of these parasitic elements results in an antenna bandwidth many times greater than that of a conventional cylindrical dipole, VSWR, pattern, and gain measurements were made in the UHF band for a variety of dipole/sleeve configurations.
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Wong et al. (1972) studied this question.
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