Abstract

AbstractA broadband Yagi–Uda antenna composed of several monopole elements is proposed. By locating the director close to the excited element and superposing the characteristics of the reflector in a lower band to those of the director in a higher band, a broadband property is obtained for both the input impedance and the unidirectional pattern. Analysis by the method of moments indicates that the Yagi–Uda antenna (type 1) composed of three monopole elements has a bandwidth of 1:1.67 for VSWR ≤ 2, 1:1.84 for Gd/Gr ≥ 9 dB , and more than one octave for Gd≥8 dBi , where Gd and Gr denote the directive gains in the front and back directions, respectively. It is also shown that the Yagi–Uda antenna (type 4) composed of five monopole elements has about one octave for a bandwidth of VSWR ≤ 2 and Gd≥8 dBi . © 2001 Scripta Technica, Electron Comm Jpn Pt 1, 85(1): 49–57, 2002

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