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Radiation Pattern Behaviour of Reconfigurable Asymmetry Slotted Ultra Wideband Antenna

Authors:
Yusnita Rahayu
Azlyna Senawi
Razali Ngah

Keywords: antenna; antenna measurement; radiation pattern; ultra wideband; band-notched antenna.

Abstract:
This paper presents the results of radiation pattern measurement of small reconfigurable slotted ultra wideband (UWB) antennas. The measurements were conducted by using RF measurement and instrumentation facilities, software tools available at WCC of Universiti Teknologi Malaysia. The original antenna’s geometry proposed is slotted antenna with L and U slots. Then the slots modifications are applied in order to achieve band-notched characteristics. These proposed antennas are having band notched frequencies at Fixed Wireless Access (FWA), HIPERLAN and WLAN bands. The band-notched operation is achieved by incorporating some small gaps instead of PIN diodes into the slot antenna. It is found that by adjusting the total length of slot antenna to be about a half-wavelength or less at desired notched frequency [1-3], a destructive interference can take place, thus causing the antenna to be non-responsive at that frequency. It was also observed that the measured radiation patterns, H-planes, are omni-directional with slightly gain decreased at boresight direction for measured frequencies. There are also more ripples occurred in the measured pattern compared with the simulated one.

Pages: 81 to 86

Copyright: Copyright (c) IARIA, 2011

Publication date: June 19, 2011

Published in: conference

ISSN: 2308-4219

ISBN: 978-1-61208-140-3

Location: Luxembourg City, Luxembourg

Dates: from June 19, 2011 to June 24, 2011