volume | PIER Journals

Abstract

A super-wideband (SWB) antenna of enhanced performance is proposed to cover the frequency band from 3 to 30 GHz. The proposed antenna can be regarded as a two-arm antenna of fractal structure. Each of the antenna arms can be viewed as composed of multiple merged wideband fractal elements. Each fractal element is a wide-flare metallic sector-shaped radiator with circular (arc-shaped) edges to enhance the bandwidth over which the antenna impedance is matched to 50 Ω-feeder. A novel SWB balun is proposed for feeding the two-arm antenna of its balanced structure through the conventional coaxial feeder of its unbalanced structure. For experimental assessment of its performance, the proposed antenna is fabricated and measured by a vector network analyzer (VNA). The experimental results come in agreement with the results obtained by the CST® simulator. It is shown that the proposed antenna has a ratio bandwidth (RBW) of 10:1, percentage bandwidth (%BW) of 164%, and bandwidth-dimension ratio (BDR) of 1952. The efficiency of radiation of the proposed antenna is shown to begreater than 98% over most of the operational frequency band.

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Dr. Mohamed Salah Fouad

Dr. Asmaa Elsayed Farahat

Professor Khalid Fawzy Ahmed Hussein

Professor Abdelhameed Abdelmoneim Shaalan

Dr. Mai F. Ahmed