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Compact curved half circular disc-monopole UWB antenna

Published online by Cambridge University Press:  19 January 2015

Ahmed M. Abdelraheem  and
Mahmoud A. Abdalla
Ahmed M. Abdelraheem*
Affiliation:
Electromagnetic Waves Group, Department of Electronic Engineering, Military Technical College, Nasr City, Cairo 11789, Egypt
Mahmoud A. Abdalla
Affiliation:
Electromagnetic Waves Group, Department of Electronic Engineering, Military Technical College, Nasr City, Cairo 11789, Egypt
*
Corresponding author:A. M. Abdelraheem Email: [email protected]
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Abstract

This paper introduces a compact modified semi-circular monopole ultra-wideband (UWB) antenna. A compact antenna size (4.3 × 3.4 cm2) compared to the typical coplanar waveguide (CPW) circular monopole antenna (5.5 × 4 cm2) is achieved. The proposed antenna is completely proven for UWB communication performance. The antenna is matched over 8.4 GHz bandwidth (2.2–10.6 GHz), with reflection coefficient lower than −10 dB over the band. Matching bandwidth is verified through simulation and measurements of VSWR. Efficient power radiation over the band is proven through radiation efficiency. Radiation efficiency is not lower than 81% at the upper end of the band. Omnidirectional characteristics are proven through, firstly, measured transfer function magnitude at three different configurations, Face-to-Face, Face-to-Side, and Side-by-Side (all frequencies at different orientations), and, secondly, measured radiation pattern at three selected frequencies that span the bandwidth (all orientations at different frequencies). Moreover, the ability of the antenna to support, as narrow pulses as, 0.25 ns omnidirectionally is proven through detailed study for time response. Antenna transfer function is measured for magnitude and phase. Then, a first-order Raeighly pulse, that fulfils the FCC mask for emission restrictions, is applied at the terminals of a UWB system of the proposed UWB antenna. Finally, the output, barely distorted, normalized, pulse is compared to the input pulse.

Keywords

Disc-monopole UWBCompact curvedHalf circularTime responseBaseband narrow pulse
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 8 , Issue 2 , March 2016 , pp. 283 - 290
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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