Summary
International Symposium on Antennas and Propagation
2006
Session Number:1A2b
Session:
Number:1A2b-1
Miniaturization of built-in antenna loaded with magnetic materials for handset by using topology optimization
Akira Matsuzaki, Hisashi Morishita, Tsuyoshi Nomura, Kazuo Sato,
pp.1-4
Publication Date:2006/11/2
Online ISSN:2188-5079
Summary:
With the recent rapid progress in handsets, the downsizing of their antennas is acquiring great importance. The downsizing of these antennas is kept pace with the downsizing of the handset units. In particular, built-in antennas are required. These antennas have been downsized by changing a configuration of the antenna or utilizing materials such as dielectric materials and magnetic materials. In our previous study, a downsizing technique of antennas for handsets by utilizing a magnetic material has been investigated [1]. It was found that a magnetic material has an effect on lowering resonance frequency of a planar inverted-F antenna (PIFA) instead of changing the radiation characteristics at both 900MHz and 2GHz bands. In addition, effective configuration and arrangement of the magnetic materials was investigated on the basis of current distribution of PIFA. The topology optimization approach is applied for a structure design problem of dielectric materials, which has already been reported [2]. This approach is considered as an effective approach to obtain optimum configuration and arrangement of magnetic materials. In this study, we apply the topology optimization approach to optimize the configuration and arrangement of magnetic materials, which is inserted in the PIFA. In this optimization method, the Adjoint Variable Method (AVM) [3] and the Finite Difference Time Domain (FDTD) method are used. In this paper, we confirm the validity of using the topology optimization approach for designing the configuration and arrangement of magnetic materials.