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http://dx.doi.org/10.12673/jkoni.2012.16.5.760

Design of a Broadband Quasi-Yagi Antenna with a 2:1 Impedance Bandwidth Ratio  

Lee, Jong-Ig (Department of Electronics Engineering, Dongseo University)
Yeo, Jun-Ho (School of Computer and Communication Engineering, Daegu University)
Park, Jin-Taek (Department of Mobile Communication Engineering, Changshin University)
Publication Information
Journal of Advanced Navigation Technology / v.16, no.5, 2012 , pp. 760-765 More about this Journal
Abstract
In this paper, we studied a design method for a quasi-Yagi antenna (QYA) with broadband characteristics of an impedance bandwidth ratio greater than 2 : 1 and a gain > 4 dBi. The QYA is fed by a microstrip line fabricated on a coplanar strip line and it consists of 3 elements; a planar dipole, a nearby director close to the dipole, and a ground plane reflector. By placing a wide rectangular patch-type director near to the dipole driver, broadband characteristics are achieved. An optimized 3-element QYA for operation over 1.6-3.5 GHz (bandwidth ratio 2.2 : 1) is fabricated on an FR4 substrate with a size of 90 mm by 90 mm and tested experimentally. The results show an impedance bandwidth of 1.56-3.74 GHz (bandwidth ratio 2.4 : 1) for VSWR < 2, a peak gain of 4.2-6.3 dBi, and a front-to-back ratio (FBR) > 13.6 dB within the bandwidth.
Keywords
Quasi-Yagi antenna; planar antenna; impedance bandwidth ratio; balun; broadband antenna;
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