posted on 2024-11-11, 09:45authored byYoo Chong Cheah
This thesis describes the successful realisation of a prototype automatic null steering antenna operating at 10.5 GHz. The aim of this antenna system is to emulate the interference cancelling capability of the well known adaptive antennas without resorting to expensive ancillary microwave hardware such antennas require. A study was carried out on the problems of antenna radiation pattern synthesis with null placement and that of resolving the amplitude and the direction of arrival of the incident signals on a linear antenna array. Detailed discussion and some new solutions to these problems are proposed and presented in this thesis. Based on the knowledge gained in the work done in these two areas, an experimental automatic null steering antenna array system operating at 10.5 GHz. was successfully designed and constructed. The development of the antenna system required the design of a novel complex weighting circuit which could alter both the in phase and the quadrature phase signal paths of an input signal at 10.5 GHz independently under microprocessor control. Other relevant digital and microwave hardware were also developed. Detailed experimental verification of the antenna array performance is also included.
History
Year
1984
Thesis type
Doctoral thesis
Faculty/School
Department of Electrical and Computer Engineering
Language
English
Disclaimer
Unless otherwise indicated, the views expressed in this thesis are those of the author and do not necessarily represent the views of the University of Wollongong.