Wideband Bow-Tie Slot Antennas with Tapered Tuning Stubs

For the purpose of wideband operations, a bow-tie slot antenna fed by a coplanar waveguide (CPW) is investigated. The design was realized using a tapered metal stub introduced in the middle of the bow-tie slot. The modified structure shows wider bandwidth over the conventional bow-tie slot antenna. Parametric study of this new antenna results in a design procedure that helps design this class of antennas for different frequency bands with wideband characteristics. Two designs of this antenna, working at the X-band centered at 10 GHz and the R-band centered at 2.15 GHz, are fabricated and the measured return losses are presented. The measured bandwidth is 88% at the X-band and 66% at the R-band, with a 50 Ω input impedance.