Abstract
This research presents a rectangular ring antenna excited by a circular disc monopole (CDM) mounted in front of a square reflector. The proposed antenna is designed to cover a frequency range of 2.300–5.825 GHz and thereby is suitable for WiMAX applications. Multiple parametric studies were carried out using the CST Microwave Studio simulation program. A prototype antenna was fabricated and experimented. The measurements were taken and compared with the simulation results, which indicates good agreement between both results. The prototype antenna produces an impedance bandwidth (|S11|< −10 dB) that covers the WiMAX frequency range and a constant unidirectional radiation pattern (θ=0°and∅=90°). The minimum and maximum gains are 3.7 and 8.7 dBi, respectively. The proposed antenna is of compact size and has good unidirectional radiation performance. Thus, it is very suitable for a multitude of WiMAX applications.
Highlights
Besides an integral part of wireless communications, a wideband antenna is a crucial technology in the short-range, highspeed, and indoor wireless communications
To generate a unidirectional beam, a planar reflector [12, 13], corner reflector [14, 15], parabolic reflector [16], or conical reflector [17] was used with an omnidirectional monopole antenna
The simulated impedance bandwidth (|S11| < −10 dB) of 88% was achieved in a frequency range of 2.28–5.91 GHz, while that of the prototype antenna of 93% was in a frequency of 2.16–5.96 GHz
Summary
Besides an integral part of wireless communications, a wideband antenna is a crucial technology in the short-range, highspeed, and indoor wireless communications. One distinct characteristic of indoor base stations is their omnidirectional radiation pattern, which is their main drawback since an omnidirectional antenna can cover a limited circular area. This renders the omnidirectional antenna unsuitable for applications in the environment characterized by long and confined spaces in which a unidirectional antenna is more appropriate. Unidirectional antennas are applicable to point-topoint communications In these environments, for example, streets, highways, tunnels, and corridors, a unidirectional or bidirectional antenna performs better than an omnidirectional antenna [5,6,7,8,9,10,11]. The unidirectional bandwidth is narrow and could be enhanced by replacing the linear monopole with a surface monopole, for example, circular, triangular, square, or rectangular monopole [18,19,20,21,22]
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