Title:
TRANSMITTING AND RECEIVING ANTENNA
Document Type and Number:
WIPO Patent Application WO/2001/067551
Kind Code:
A1
Abstract:
A transmitting and receiving antenna is provided for use with a portable terminal device for satellite or surface communications. Varactor diodes are provided on feeders to the elements of a helical antenna. The electrical length of the antenna can be changed by changing the bias voltage applied to the varactor diodes depending on whether it is used for transmission or reception, so that the transmitting and receiving antenna can be resonant to both transmission and reception frequencies.
Inventors:
KAJIKAWA HIROSHI (JP)
Application Number:
PCT/JP2000/001324
Publication Date:
September 13, 2001
Filing Date:
March 06, 2000
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
KAJIKAWA HIROSHI (JP)
KAJIKAWA HIROSHI (JP)
International Classes:
H01Q1/24; H01Q1/36; H01Q1/38; H01Q5/00; H01Q11/08; H04B1/38; H04B1/3822; (IPC1-7): H01Q11/08; H01Q5/00
Foreign References:
| EP0877442A2 | 1998-11-11 | |||
| JPH0539016U | 1993-05-25 | |||
| JPH06268564A | 1994-09-22 | |||
| JPS58189638U | 1983-12-16 |
Attorney, Agent or Firm:
Miyata, Kaneo (Marunouchi 2-chome Chiyoda-ku Tokyo, JP)
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