Ultra Wide Band (UWB) Antenna with improvement in Miniaturization, Gain and Bandwidth performance with Annular Ring approach

Abstract

In this paper, authors propose a new way of improving the gain-bandwidth performance of Ultra-Wideband (UWB) antenna using annular ring arcs. Annular ring arc is portion of the annular ring with specific length and sector angle that contributes to effective aperture area of the antenna. Hence, such structure helps to improve gain-bandwidth performance of antenna. Length, width, and angle of ring-arc was calculated mathematically based on effective aperture of antenna. Placement of annular rings is another important factor discussed in this paper that was found by experimentation. The antenna design is finished within three iterations and finalized antenna was fabricated and tested. Measurement results and simulation results of antenna agreed.  The antenna frequency band ranges from 2.1 GHz to 10.4 GHz with achieved size reduction of 38.74%. The antenna was fabricated on FR4 epoxy substrate with 0.8 mm thickness and dielectric constant of 4.4 and achieves acceptable return loss over the band of operation.