Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.633123
Title: Antenna design for future mobile communication terminals
Author: Ee, Lee
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2001
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Abstract:
The vision of the Personal Communication System is to provide ubiquitous communication anytime, anywhere in the world. This has led to the development of multiple standards that are currently being used throughout the world. The purpose of this thesis is to look at some of these scenarios and proposed innovative antenna design solutions to meet the needs of the current and future generation wireless communication systems. This thesis entitled "Antenna Design for Future Mobile Communication Terminals" documented the work done from 22 nd September 1997 to 1 st April 2001. To this end, three wireless scenarios were identified. In the first scenario, the implications and demands for both terrestrial and satellite communication systems were examined. This led to the development of a highly innovative and integrated compact microstrip antenna with dual polarisation capabilities. The proposed microstrip antenna is able to operate at both GSM and Iridium frequencies simultaneously. The radiation characteristic of the proposed antenna is such that there is no need to re-orientate the antenna for either satellite or terrestrial operation. In the next wireless scenario, the implication of the proliferation of different types of terrestrial mobile standards around the world means that future mobile antennas need to be capable of either multi-band or wide-band performances. To this end, two novel antennas based on the monopole antenna geometry have been developed. In both cases, both the proposed antennas exhibited very good dual band capabilities. In addition, one of the proposed antennas, the novel compact planar monopole, can also be optimised for wide-band operations. This compact planar antenna is capable of providing cellular coverage for the following mobile frequency bands; GSM, AMPS, DCS 1800, DECT, Bluetooth, wireless LAN, UMTS and its extension bands. In the last scenario, antenna design solutions that are able to minimise the effect of signal fading on a mobile terminal were investigated. Although there are a number of techniques available, the emphasis in this particular thesis is on the development of compact pattern diversity antennas. To this end, two innovative antenna structures will be introduced. One of the proposed designs made used of the H-patch geometry and a simple switching network to generate the required pattern diversity performance. In the other design, a patch antenna configuration has been used to generate the same pattern diversity performance. The electrical performance characteristics of these proposed antennas have also been measured. An attempt was also made to develop simple antenna circuit models using the transmission line method. These circuit models have been successfully used to predict the performance and resonant frequency behaviours of the compact microstrip antennas. These models also helped to explain the operation of the various compact microstrip antennas in terms of their various parasitic elements. This provides a simple and insightful look into the operation of these classes of microstrip antennas.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.633123  DOI: Not available
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