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Investigation on the effects of resistive loading on wrapped bow-tie antennas

Published online by Cambridge University Press:  10 January 2019

Doojin Lee ,
George Shaker  and
William Melek
Doojin Lee*
Affiliation:
Mechanical and Mechatronics Engineering, University of Waterloo (UW), Waterloo, Ontario (ON), Canada
George Shaker
Affiliation:
Mechanical and Mechatronics Engineering, University of Waterloo (UW), Waterloo, Ontario (ON), Canada
William Melek
Affiliation:
Mechanical and Mechatronics Engineering, University of Waterloo (UW), Waterloo, Ontario (ON), Canada
*
Author for correspondence: Doojin Lee, E-mail: doojin.lee@uwaterloo.ca
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Abstract

The pulse radiating characteristic of a wrapped bow-tie antenna (WBA) and wrapped resistively loaded bow-tie antenna (WRLBA) is presented for impulse radar applications in this paper. The numerical analysis of the WRLBA is performed by comparing that of the WBA. The wrapped antennas are realized on a flexible substrate. The antennas are fed by an impedance tapered balun, which has an overall transmission loss of −1.4 dB over the balun length. The characteristics of the resistive loading to the wrapped antenna, such as reflection coefficient, reflected pulse in the time domain, voltage standing wave ratio, and input impedance, are experimentally investigated and compared with simulated results. The fidelity factor of the radiated electric field on the boresight direction for the WBA and WRLBA is calculated as 0.82 and 0.96, respectively. The wireless communication ability is evaluated by the transmission coefficient, group delay, boresight gain, and received waveform. The calculated fidelity factor of the received waveform for the WBA and WRLBA is 0.79 and 0.85, respectively. The average and variations of the group delay of both wrapped antennas are observed to be around 2.5 ns and less than 1.5 ns, respectively.

Keywords

Impulse radarpulse radiating antennasresistive antennaswireless communicationwrapped bow-tie antennas
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 11 , Issue 4 , May 2019 , pp. 390 - 400
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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