Ultra Wideband Antenna of High Efficiency Printed on Multilayered Substrate

A novel ultra-wideband (UWB) antenna of nearly 100% radiation efficiency is proposed in the present paper. The antenna is composed of rhombic-shaped two-arm driven element with parasitic circular rings printed on the opposite faces of a three-layer dielectric substrate. Each of the antenna arms are reactively coupled to a conducting ring through a narrow circular gap for enhancing the bandwidth of the antenna. The material of the top and bottom layers of the substrate is Rogers RO3003
^™
of thickness 0.13 mm, whereas the central layer material is Taconic TLP-5
^™
of thickness 1.4 mm. The antenna is fabricated and the measurements show good agreement with the results obtained by the CST
^®
simulator. The antenna bandwidth is 9.1 GHz and ranges from 2. 5 to 11. 6 GHz (140%). The antenna produces omnidirectional radiation pattern where the maximum gain ranges from 2.4 to 4.1 dBi over the entire bandwidth. The antenna has an average total efficiency of about 95% and average radiation efficiency of about 99% over the operational frequency band (2.5 – 11.5 GHz).