Broadband Compact Quasi‐Yagi Antenna for Indoor Digital Tv

Abstract

In this article, a design method for a broadband three‐element quasi‐Yagi antenna for indoor digital television (DTV) is presented. The antenna consists of a dipole fed by a coplanar strip (CPS) line, a rectangular patch‐type director, and a ground reflector. The transition between a microstrip (MS) feed line and the CPS line is implemented on the CPS to match the input impedance of the antenna with a 75‐Ω MS feed line. The impedance bandwidth is improved by appending a wide strip‐type patch director at a location close to the dipole driver. The antenna size is reduced by using a half bow‐tie‐shaped dipole and reflector. The antenna is designed and optimized for operation in the terrestrial DTV band (470–806 MHz) and is fabricated on an FR4 substrate. Although, the antenna size (240 mm by 200 mm) corresponds only to 0.36λ0 by 0.30λ0 (λ0; free space wavelength at 450 MHz), the experiment results show that the antenna has good performance, such as a wide impedance band of 450–848 MHz for a voltage standing wave ratio < 2, a moderate gain of 3.5–4.6 dBi, and a high front‐to‐back ratio > 10.4 dB. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2859–2863, 2013

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