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Design of a simple three-element quasi-Yagi antenna with a broad impedance bandwidth up to 2.4 : 1

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  • Jong-Ig Lee
  • Junho Yeo

Abstract

This paper introduces a method for designing a broadband three-element quasi-Yagi antenna (QYA) with a simple geometry and compact size. The proposed QYA consists of simple strip-type elements with unequal widths and distances between them to obtain the desired performance. The proposed QYA fed by a microstrip (MS) line is compact because it has an MS line-to-coplanar strip (CPS) line transition integrated on the CPS line, without requiring additional space for the transition. When a rectangular patch-type director is placed close to the driver dipole fed by a CPS line, the antenna becomes a triple resonance structure, and the impedance bandwidth is extensively increased up to 2.4 : 1 (82.3%) for a VSWR 4 dBi and a frequency band of 1.6–3.6 GHz is presented. The optimized antenna is fabricated on an FR4 substrate with dimensions of 90 mm × 90 mm and is tested experimentally. The results demonstrate an impedance bandwidth of 2.4 : 1 (1.56–3.74 GHz, 82.3%) for a VSWR 4 dBi, a cross-polarization level of 13.6 dB within the bandwidth.

Suggested Citation

  • Jong-Ig Lee & Junho Yeo, 2013. "Design of a simple three-element quasi-Yagi antenna with a broad impedance bandwidth up to 2.4 : 1," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 27(17), pages 2247-2262, November.
    • Handle: RePEc:taf:tewaxx:v:27:y:2013:i:17:p:2247-2262
    DOI: 10.1080/09205071.2013.838911
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