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Antennas with frequency domain control for future communication systems.

Hu, Zhen Hua Sampson (2012)
Ph.D. thesis, University of Birmingham.

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Abstract

This dissertation describes research into “Antennas with Frequency Domain Control for Future Communication Systems” and several novel antennas are shown, each of which addresses a specific issue for current and future communication systems, in terms of wideband coverage, channel capacity, antenna isolation and band-rejection. These antenna designs may be candidates for implementation in future multiband radios, and software defined radio (SDR) and cognitive radio (CR) systems, which are two new concepts in wireless communications in the foreseeable future, although it is evident that there are as yet no clear specifications for those future systems. A novel two-port reconfigurable antenna which can operate within a narrowband or wideband mode is presented. Three different structures of wideband reconfigurable balanced antennas, with a wide tuning range, have been proposed. When the balanced antenna is combined with the two-port chassis antenna, it becomes a reconfigurable MIMO antenna for small terminals and at least 15 dB of isolation is achieved. Several designs of conical monopole antennas, incorporating different types of slots to achieve good band-rejection behaviour, have been introduced. These are the 2 Cshaped, 4 C-shaped slots, 4 U-shaped slots, 4 tilted-U-shaped slots and 4 U-C-shaped slots. The study of wideband antennas with notched-band behaviour using a simple equivalent circuit model has been proposed. It has been noted that increasing the number of resonators and the coupling factor will increase the band-rejection. However, it will also widen the bandwidth of the frequency notched band. A novel pyramidal monopole antenna, with four loop shaped slots, offering wide tunable band-notch, is also presented.

Type of Work:Ph.D. thesis.
Supervisor(s):Hall, Peter S. and Gardner, Peter
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School Electronic, Electrical and Computer Engineering
Subjects:QA75 Electronic computers. Computer science
T Technology (General)
TJ Mechanical engineering and machinery
TK Electrical engineering. Electronics Nuclear engineering
Institution:University of Birmingham
ID Code:3332
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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