Home // International Journal On Advances in Telecommunications, volume 5, numbers 1 and 2, 2012 // View article
Authors:
Yusnita Rahayu
Razali Ngah
Keywords: reconfigurable antenna, slotted antenna, radiation pattern, ultra wideband, band-notched antenna.
Abstract:
Radiation pattern characteristics of reconfigurable asymmetry slotted ultra wideband antenna with multiple band-notched is presented. The proposed antenna is planar monopole, consisting of a microstrip feed line and modified L and U slots with a pentagonal patch on the front side and half ground plane is on the back side of the board. The measurements were conducted by using Radio Frequency measurement and instrumentation facilities, software tools available at the Wireless Communication Center in Universiti Teknologi Malaysia. The modified antennas are designed for having reconfigurable frequency notched at Fixed Wireless Access, High Performance Local Area Network, and Wireless Local Area Network. A good agreement is achieved between simulated and measured Voltage Standing Wave Ratio results. The measured result is approximately less than 2.2 over 3 GHz to 10 GHz. It was also observed that the measured radiation patterns, H-planes, are omnidirectional with a slight gain decreased at boresight direction for measuring frequencies. There are also more ripples occurred in the measured pattern compared with the simulated one. Comparison measured radiation patterns between asymmetry slotted antenna with and without notch band characteristic have been done. Multiple reflections, rotator alignment, probe rotary joint and room scattering are found as primary sources of errors that cause degradation in measured radiation patterns. Current distribution characteristic of the antenna is also reviewed.
Pages: 90 to 100
Copyright: Copyright (c) to authors, 2012. Used with permission.
Publication date: June 30, 2012
Published in: journal
ISSN: 1942-2601