Broadband monopole Yagi-Uda antenna

Yujiro Taguchi, Qiang Chen, Kunio Sawaya

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A 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.

Original languageEnglish
Pages (from-to)49-57
Number of pages9
JournalElectronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)
Issue number1
Publication statusPublished - 2002 Jan 10


  • Aeronautical antenna
  • Broadband characteristics
  • Closely located elements
  • Monopole antenna
  • Yagi-Uda antenna

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


Dive into the research topics of 'Broadband monopole Yagi-Uda antenna'. Together they form a unique fingerprint.

Cite this