DocumentCode :
2779842
Title :
An Ultra-wide Band Omnidirectional Monopole Antenna
Author :
Wu, Xuan Hui ; Kishk, Ahmed A.
Author_Institution :
Dept. of Electr. Eng., Mississippi Univ., MS
fYear :
2007
fDate :
21-23 March 2007
Firstpage :
345
Lastpage :
348
Abstract :
Ultra-wide band (UWB) wireless communication occupies a bandwidth from 3.1 to 10.6 GHz to achieve high data rate over a short distance. Two competing schemes, namely multiband orthogonal frequency-division multiplexing (MB-OFDM) and direct sequence ultra-wide band (DS-UWB) are proposed to make use of the ultra-wide bandwidth. In this paper, an omnidirectional UWB monopole antenna is proposed. It was constructed by symmetrically wrapping a planar monopole antenna, to give almost omnidirectional radiation in both strength and phase delay over the UWB band. Impedance matching was kept good. The return loss of the antenna was examined numerically and verified experimentally. Antenna radiation characteristics in different azimuth angles were investigated numerically. Time-domain analysis was carried out for the monopole antenna under the content of both the DS-UWB and MB-OFDM schemes. Radiated waveforms in different directions were compared, and found to be almost independent of the azimuth angle. It demonstrated that the antenna is suitable for UWB applications where an omnidirectional property is required.
Keywords :
OFDM modulation; antenna radiation patterns; impedance matching; monopole antennas; planar antennas; spread spectrum communication; time-domain analysis; ultra wideband antennas; ultra wideband communication; 3.1 to 10.6 GHz; DS-UWB schemes; MB-OFDM schemes; UWB wireless communication; antenna radiation characteristics; direct sequence ultra-wide band; impedance matching; multiband orthogonal frequency-division multiplexing; omnidirectional radiation; phase delay; planar monopole antenna; time-domain analysis; ultra-wide band omnidirectional monopole antenna; Antenna measurements; Azimuth; Bandwidth; Dipole antennas; Finite difference methods; Frequency; Geometry; Impedance matching; Ultra wideband antennas; Wireless communication;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Antenna Technology: Small and Smart Antennas Metamaterials and Applications, 2007. IWAT '07. International Workshop on
Conference_Location :
Cambridge
Print_ISBN :
1-4244-1088-6
Electronic_ISBN :
1-4244-1088-6
Type :
conf
DOI :
10.1109/IWAT.2007.370145
Filename :
4227461
Link To Document :
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