Summary
International Symposium on Antennas and Propagation
2008
Session Number:1IS01A
Session:
Number:1IS01A-4
Topology Optimization of Magnetically-Loaded Planar Inverted-F Antenna for Handset
Naobumi Michishita, Shinya Endoh, Hisashi Morishita,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
The combined method of the topology optimization and the finite-difference time-domain (FDTD) method has been proposed for bandwidth enhancement of dielectric resonator antenna [1]. The objective function is the integral value of the reflection pulse from the feed point to the coaxial line. The topology of the dielectric material is optimized to minimize the objective function. As a result, the bandwidth becomes four times wider than the initial homogeneous material. The topology optimization method (TOM) has been applied to optimize the configuration and arrangement of the magnetic materials for miniaturization of the planar inverted-F antenna (PIFA) on the infinite ground plane [2],[3] and the enclosure for a handset [4]. However, the dielectric and magnetic effects and the validity of the optimized topologies of the magnetic materials are not cleared. In this paper, the configuration and the arrangement of the magnetic materials for miniaturization of the PIFA are investigated. The effects of the dielectric and magnetic materials and their amounts depend on the arranging position of the magnetic materials. The design region by using TOM for the implementation of the magnetic materials causes the various optimized topologies of the magnetic materials. The VSWR and radiation characteristics of the optimized magnetically-loaded PIFA are verified through finite element method (FEM) and measured results of the simplified configuration of the magnetic materials.