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Antenna designs for handset applicat...

Li, Zhan.

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Antenna designs for handset applications: Multiple antennas integration and interaction with the human head.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Antenna designs for handset applications: Multiple antennas integration and interaction with the human head./
作者:	Li, Zhan.
面頁冊數:	146 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2741.
Contained By:	Dissertation Abstracts International66-05B.
標題:	Engineering, Electronics and Electrical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3175192
ISBN:	9780542134470

Antenna designs for handset applications: Multiple antennas integration and interaction with the human head.
Li, Zhan.

Antenna designs for handset applications: Multiple antennas integration and interaction with the human head. - 146 p.

Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2741.

Thesis (Ph.D.)--University of California, Los Angeles, 2005.

As today's market demands smaller and multi-function handsets, customized antenna designs play an important role. This research focuses on the low-profile antennas and the integration of multiple antennas. Public concern on the Radio Frequency (RF) radiation also leads to the study on the interaction between the handset antenna and the human head. Simulation results and prototype measurements are both presented in this dissertation to address some practical issues.

ISBN: 9780542134470Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Antenna designs for handset applications: Multiple antennas integration and interaction with the human head.
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500 $a Chair: Yahya Rahmat-Samii.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 2005.
520 $a As today's market demands smaller and multi-function handsets, customized antenna designs play an important role. This research focuses on the low-profile antennas and the integration of multiple antennas. Public concern on the Radio Frequency (RF) radiation also leads to the study on the interaction between the handset antenna and the human head. Simulation results and prototype measurements are both presented in this dissertation to address some practical issues.
520 $a The Planar Inverted "F" Antenna (PIFA) has been utilized in the handset industry as one of the major cellular antennas due to its compactness. In this research, different types of handset antennas are briefly described and compared first, and then the focus is put on the PIFA. A dual-band PIFA to cover both the 800 MHz band (824MHz&sim;894 MHz) and the 1900 MHz band (1850 MHz&sim;1990 MHz) is introduced. Different methods have been applied to enhance the PIFA bandwidth under certain industrial design restrictions. To address the multiple-antenna solutions, a PIFA-Whip combination and a PIFA-IFA combination are investigated. In the PIFA-Whip combination, a decoupling method has been employed to improve the PIFA's efficiency when the whip is retracted. In the PIFA-IFA combination, a side-mounted Inverted "F" Antenna (IFA) is designed to be a Global Positioning System (GPS) antenna at 1575.42 MHz. The efficiencies of both antennas have been optimized.
520 $a The Specific Absorption Rate (SAR) is introduced to quantify the human exposure to RF energy. Techniques to reduce the SAR value of the handset have been studied, in which measurement of SAR and its distribution will both be displayed. Total Radiated Power (TRP) has become one of the specifications by the mobile carriers that represent the antenna performance of a handset. Optimization of different PIFA models from the perspective of TRP will be presented.
520 $a Another part of this research concentrates on a new application for future handsets, namely the Electromagnetic Band Gap (EBG). The electromagnetic characteristics of the EBG surface are studied with Finite Difference Time-Domain (FDTD) technique, which is one of the powerful numerical tools to analyze antenna problems. A novel method to search for the band gap, which takes into account both the EBG surface and a dipole antenna, will be presented.
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790 1 0 $a Rahmat-Samii, Yahya, $e advisor
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791 $a Ph.D.
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