Title:
ANTENNA, METHOD FOR MANUFACTURING THE SAME AND PORTABLE RADIO TERMINAL EMPLOYING IT
Document Type and Number:
WIPO Patent Application WO/2005/048404
Kind Code:
A1
Abstract:
A small antenna operating in multimode, especially in three or more modes, for embodying a small and inexpensive multimedia radio terminal, a method for manufacturing the same and a portable radio terminal having the antenna. The antenna comprises a ground conductor (2) having a ground potential, a single feeding point (7) having a part of the ground conductor (2) as one end, and a plurality of transmission lines receiving a high frequency power fed to the feeding point (7) and radiating electromagnetic waves of three frequencies in three modes into the space. The transmission lines include a transmission line (41) having one end connected with the feeding point (7) and the other end connected with a branch point (31), a transmission line (42) connected between the branch point (31) and a branch point (32), and transmission lines (51, 61, 62) connected with the branch points. The lengths of the transmission lines are set such that the impedance is matched for a plurality of frequencies at the feeding point (7). The antenna (1) is formed of an integral metal plate.
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| WO/2000/031821 | MICROWAVE MIXER WITH BALUNS HAVING RECTANGULAR COAXIAL TRANSMISSION LINES |
| JPS5974704 | WAVEGUIDE |
| WO/1994/009528 | FILTER AND METHOD FOR ITS MANUFACTURE |
Inventors:
TAKEI KEN (JP)
OGAWA TOMOYUKI (JP)
IKEGAYA MORIHIKO (JP)
FUKUCHI KEISUKE (JP)
OGAWA TOMOYUKI (JP)
IKEGAYA MORIHIKO (JP)
FUKUCHI KEISUKE (JP)
Application Number:
PCT/JP2004/011193
Publication Date:
May 26, 2005
Filing Date:
July 29, 2004
Export Citation:
Assignee:
HITACHI LTD (JP)
HITACHI CABLE (JP)
TAKEI KEN (JP)
OGAWA TOMOYUKI (JP)
IKEGAYA MORIHIKO (JP)
FUKUCHI KEISUKE (JP)
HITACHI CABLE (JP)
TAKEI KEN (JP)
OGAWA TOMOYUKI (JP)
IKEGAYA MORIHIKO (JP)
FUKUCHI KEISUKE (JP)
International Classes:
H01P11/00; H01Q1/24; H01Q1/38; H01Q5/00; H01Q5/10; H01Q5/357; H01Q5/371; H01Q9/42; H01Q13/08; H04M1/02; (IPC1-7): H01Q5/01
Foreign References:
| JPH0669715A | 1994-03-11 | |||
| JP2003101326A | 2003-04-04 |
Attorney, Agent or Firm:
Ogawa, Katsuo (8th Floor No.17 Arai Building, 3-3, Shinkawa 1-chom, Chuo-ku Tokyo, JP)
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