Abstract
A wideband unidirectional bowtie antenna with stable radiation patterns is proposed and investigated. It is fed by a wideband microstrip balun, using a coupling triangular structure to induce more balanced currents. Particularly, the corners of the conventional triangular bowtie dipole are rounded to achieve an impedance BW of 106.9% for jS11j • i10dB ranging from 1.97GHz to 6.49GHz. Additionally, a special small circular re∞ector between the ground plane and the bowtie dipole is used to stabilize the radiation patterns. The antenna achieves a stable gain of around 9.5dBi with a little variation of 1.4dBi and unidirectional radiation patterns over the whole operating band.
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