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Balanced antennas for mobile handset applications. Simulation and Measurement of Balanced Antennas for Mobile Handsets, investigating Specific Absorption Rate when operated near the human body, and a Coplanar Waveguide alternative to the Balanced Feed.
Alhaddad, A.G.
Alhaddad, A.G.
Publication Date
2013-03-26
End of Embargo
Supervisor
Keywords
Balanced antennas, Planar antennas, Digital Cellular System (DCS), Personal Communication Service (PCS), Universal Mobile Telecommunication System (UMTS), Wireless Local Area Network (WLAN), Ultra-Wide Bandwidth (UWB), Specific Absorption Rate (SAR), Coplanar Waveguide, Hybrid method, Low profile antennas, Mobile handset applications
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The University of Bradford theses are licenced under a Creative Commons Licence.
Peer-Reviewed
Open Access status
Accepted for publication
Institution
University of Bradford
Department
School of Engineering, Design and Technology
Awarded
2012
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Abstract
The main objectives of this research are to investigate and design low profile antennas
for mobile handsets applications using the balanced concept. These antennas are
considered to cover a wide range of wireless standards such as: DCS (1710¿1880 MHz),
PCS (1850¿1990 MHz), UMTS (1920¿2170 MHz), WLAN (2400¿2500 MHz and 5000
¿ 5800 MHz) and UWB frequency bands. Various antennas are implemented based on
built-in planar dipole with a folded arm structure.
The performance of several designed antennas in terms of input return loss, radiation
patterns, radiation efficiency and power gain are presented and several remarkable
results are obtained. The measurements confirm the theoretical design concept and show
reasonable agreement with computations. The stability performance of the proposed
antenna is also evaluated by analysing the current distribution on the mobile phone
ground plane. The specific absorption rate (SAR) performance of the antenna is also
studied experimentally by measuring antenna near field exposure. The measurement
results are correlated with the calculated ones.
A new dual-band balanced antenna using coplanar waveguide structure is also proposed,
discussed and tested; this is intended to eliminate the balanced feed network. The
predicted and measured results show good agreement, confirming good impedance
bandwidth characteristics and excellent dual-band performance.
In addition, a hybrid method to model the human body interaction with a dual band
balanced antenna structure covering the 2.4 GHz and 5.2 GHz bands is presented.
Results for several test cases of antenna locations on the body are presented and
discussed. The near and far fields were incorporated to provide a full understanding of
the impact on human tissue. The cumulative distribution function of the radiation
efficiency and absorbed power are also evaluated.
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Type
Thesis
Qualification name
PhD