PORTABLE RADIO UNIT - MITSUBISHI ELECTRIC CORP

Title:

PORTABLE RADIO UNIT

Document Type and Number:

WIPO Patent Application WO/2001/097325

Kind Code:

A1

Abstract:

A portable radio unit (1) comprises a case (2), a cover (3) attached to the case (2) and adapted to open and close, sensor means (7) for determining whether the cover (3) is open, a dipole antenna (5) attached to the cover (3), feeder means (4a, 4b, 6a, 6b) for feeding the dipole antenna (5), and control means (8) for controlling the feeder means (4a, 4b, 6a, 6b) according to whether the cover (3) is open or closed. Alternatively, the portable radio unit (1) comprises a resonator (9) provided on the case (2) such that the resonator (9) is close to the dipole antenna (5) when the cover (3) is closed. The dipole antenna (5) is connected to feeder means (6) through a first or second matching circuit (12, 13) depending on whether the cover (3) is open or closed.

Inventors:

SHOJI HIDEAKI (JP)
IMANISHI YASUHITO (JP)
FUKASAWA TORU (JP)
OHMINE HIROYUKI (JP)

Application Number:

PCT/JP2000/003818

Publication Date:

December 20, 2001

Filing Date:

June 12, 2000

Export Citation:

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Assignee:

MITSUBISHI ELECTRIC CORP (JP)
SHOJI HIDEAKI (JP)
IMANISHI YASUHITO (JP)
FUKASAWA TORU (JP)
OHMINE HIROYUKI (JP)

International Classes:

H01Q1/08; H01Q1/24; H01Q9/28; H01Q9/42; H01Q21/28; H04B1/38; H04W88/02; (IPC1-7): H01Q1/24; H01Q1/08; H01Q9/30; H04B1/38; H04B7/26

Foreign References:

US5542106A	1996-07-30
US5561436A	1996-10-01

Other References: