Bow-Tie Quasi-Yagi Antenna with the Modified Ground Plane Structure for Bandwidth-Enhanced Characteristics

Abstract

In this paper, a bow-tie quasi-Yagi antenna with a modified ground plane structure is proposed for wideband characteristics. The ground plane structure of the proposed antenna improved the impedance-matching characteristics by inserting a parallel plate ground with a width equal to the parallel-coupled feed line width. This simply modified ground plane structure can lead to an improvement in impedance matching by additional inductance, capacitance, mutual inductance, and mutual capacitance components. The proposed antenna has a −10-dB reflection coefficient fractional bandwidth of 30 % and a realized gain of 7.7 dBi at the center frequency.