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Title: The Design of Multi-Band Planar Inverted-F Antennas for Mobile Handsets with the Aid of a Novel Genetic Algorithm and their Specific Absorption Rate
Author: Saraereh, Omar Aqeel
Awarding Body: Loughborough University
Current Institution: Loughborough University
Date of Award: 2005
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Wireless Communications have progressed very rapidly in recent years and mobile handsets are becoming smaller and smaller. Present-day mobile cellular communication systems include combinations of the AMPS, GSM-900, DCS-I800, PCS-I900, UMTS, and WLANs in the 2.4GHz and 5.2GHz bands. User requirements for access to the various aforementioned wireless telecommunication services have resulted in a rapid technological push to unify these different systems in a drastically decreased size single mobile handset. All this combined with strict limitations set for the energy absorbed by the users of mobile terminals has created a need for improved antenna solutions and better understanding of small antennas. The objective of this thesis is to develop novel multi-band handset antenna design solutions to satisfy the specific bandwidth requirements of mobile cellular communication systems. Devices having internal antennas have appeared to fill this need. In the past few years, new designs based on the planar inverted-F handset antenna (PIFA) have been used for handheld wireless devices because theses types of antennas have low-profile geometry and can be embedded into mobile handsets. Therefore, the antenna topology proposed and researched to achieve the target of this thesis is the PIFA. The research involves the design of a genetic algorithm (GA) optimisation applicable to PIFAs. The technique is used to optimise the PIFA to produce a dual-band PIFA handset design suitable for personal communications at GSM-900/DCS-I800. Strategically extending and shaping the conductive plate of the optimised dual-band PIFA, a triple-band PIFA covering the DCS-I800/PCS-I900/UMTS bands is produced. The triple-band PIFA is extended to a quad-band design, by combining a meander-line planar monopole with the antenna structure to accommodate the GSM-900 band. The thesis also examines a penta-band PIFA handset design that is a potential candidate for small and low-profile structures to cover the AMPS/GSM-900/DCS-I800/PCS-I900/UMTS bands. Finally, a simulation and experimental study has been carried out to examine the relationship between the specific absorption rate (SAR) and the separation distance between a PIFA and a phantom head. The study also examines the relationship between the SAR and the antenna efficiency.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available