A study on miniaturization of ...

A study on miniaturization of 900 MHz and 2 GHz band antennas utilizing magnetic materialA study on miniaturization of 900 MHz and 2GHz band antennas utilizing magnetic material

Yoshimi Kawano('", Shogo Hayashida(l', Songyong Bae(' Yoshio Koyanagi(2) and Hisashi Morishita* ) (')Department ofElectrical Engineering, National Defense Academy, Yokosuka, Japan

+81-46-841-3810 morisita@cc.nda.ac.jp (2)Engineering Division R&D Center, PanasonicMobile Communications Co., Ltd., Yokosuka, Japan +81-46-840-5720

Koyanagi.yoshio(@)jp.panasonic.com

1. Introduction
In recent years, mobile communication systems represented by a cellular phone, have rapidly popularized and made progress. Built-in antennas are becoming more intense requirement for handset antennas. Many studies on miniaturization of the antenna utilizing dielectric materials have already been reported [1]. However, in the l