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International Journal of Antennas and Propagation
Volume 2008 (2008), Article ID 713921, 8 pages
http://dx.doi.org/10.1155/2008/713921
Research Article

Printed UWB Antenna with Coupled Slotted Element for Notch-Frequency Function

Centre for Telecommunications Value-Chain Research (CTVR), School of Electronic and Communications Engineering, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland

Received 30 April 2007; Revised 19 November 2007; Accepted 24 January 2008

Academic Editor: James Becker

Copyright © 2008 X. L. Bao and M. J. Ammann. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A novel printed monopole antenna employing a slotted-plate, which is electromagnetically coupled to the microstrip-fed planar element, is proposed to provide notch-frequency function. This technique enables stopband characteristics with improved control, compared to placing the slot in the microstrip-fed element. A detailed investigation of the rejectband properties has been made for the UWB antenna. Measured data for the optimized case show the 10 dB return loss bandwidth to be 9.8 GHz (from 2.80 GHz to 12.60 GHz) with a notchband frequency from 5.15 GHz to 5.825 GHz. Propagation measurements indicate that the electromagnetically coupled slot provides a greater reduction in stopband gain for the three principal planes, compared to placing the slot in the fed element. This is desirable to mitigate interference from WLAN systems. A full parametric study of the antenna is presented.