volume | PIER Journals

2016-06-09

Broadband Flat Gain Enhancement of Planar Double-Dipole Quasi-Yagi Antenna Using Multiple Directors

Junho Yeo,

Prof. Junho Yeo

School of Computer & Communication Engineering

Daegu University

Korea

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Jong-Ig Lee

Dr. Jong-Ig Lee

Department of Electronics Engineering

Dongseo University

Korea

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Progress In Electromagnetics Research C, Vol. 65, 1-9, 2016

doi:10.2528/PIERC16042105

Abstract

In this article, a method of broadband flat gain enhancement for a planar double-dipole quasi-Yagi antenna using multiple directors is proposed. The proposed antenna consists of two dipole drivers with different lengths, a truncated ground plane, and three parasitic strip directors. First, the length ratio of the two dipoles is adjusted to increase the gain in the low-frequency region. Next, three parasitic strip directors are employed to increase the impedance bandwidth and improve the gain of the antenna in the middle- and high-frequency regions. A detailed design procedure for the proposed antenna, covering a frequency band of 1.70-2.70 GHz with a gain > 8 dBi, is explained, along with a step-by-step analysis of the effects of placing each director on input impedance, voltage standing wave ratio (VSWR), and gain characteristics. Experiment results show that the proposed antenna has the desired impedance characteristics with a frequency band of 1.66-2.88 GHz (53.7%) for a VSWR < 2, and a stable flat gain of 8.0-8.4 dBi in the 1.70-2.70 GHz frequency range. Moreover, a measured front-to-back ratio > 11 dB within the band is achieved.

Citation

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Junho Yeo, and Jong-Ig Lee, "Broadband Flat Gain Enhancement of Planar Double-Dipole Quasi-Yagi Antenna Using Multiple Directors," Progress In Electromagnetics Research C, Vol. 65, 1-9, 2016.
doi:10.2528/PIERC16042105

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