Title:
【発明の名称】アンテナ装置およびそれを用いた移動体通信機器
Document Type and Number:
Japanese Patent JP3438228
Kind Code:
B2
Abstract:
The present invention relates to an antenna device used in mobile communication apparatus such as cellular phones, and which achieves good transmission and reception of information in more than one frequency band. The present invention aims at providing antenna devices and mobile communication apparatus using the devices, which allow an easy and wide ranging adjustment of the impedance properties of the antenna as well as their productive mass production. To satisfy the foregoing purpose, the antenna device of the present invention includes a) a spiral-shaped first antenna element (1) of which one end is open and the other end is electrically connected to a high frequency circuit inside a communication terminal; and b) a second antenna element (2) having both ends being open, and which is insulated from and disposed on either outer or inner surface of the first antenna element (1). The impedance properties of an antenna can be adjusted by changing the disposing position of the second antenna element (2).
Inventors:
Sho Fukushima
Naoki Yuda
Masahiro Ohara
Naoki Yuda
Masahiro Ohara
Application Number:
JP54685099A
Publication Date:
August 18, 2003
Filing Date:
March 16, 1999
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H01Q5/10; H01Q1/24; H01Q1/36; H01Q1/38; H01Q11/08; H01Q19/28; (IPC1-7): H01Q5/01; H01Q1/24; H01Q11/08
Domestic Patent References:
| JP5275919A | ||||
| JP3236612A | ||||
| JP9246828A | ||||
| JP1032410A | ||||
| JP1022730A |
Attorney, Agent or Firm:
Fumio Iwahashi (2 others)