UNBALANCED ANTENNA

Title:

UNBALANCED ANTENNA

Document Type and Number:

WIPO Patent Application WO/2004/038860

Kind Code:

A1

Abstract:

An unbalanced antenna in which a radiation conductor and a grounding conductor are spaced at an arbitrary interval. At least a part facing the radiation conductor of the ground conductor is left to maintain the action as a minus electrode for establishing a near electromagnetic field distribution between the ground conductor and the radiation conductor facing the ground conductor. Part of the size-reduced ground conductor, specifically the end parts apart from a feed unit, is composed of a conductor of low conductance, thereby ensuring impedance matching. If the size of the ground conductor is extremely reduced, mode mismatching inevitably occurs. Therefore, at least part of the outer conductor of a coaxial feed line connected to the feed unit is covered with a current absorber. Thus, the leakage current is forcedly suppressed, and the size of the ground conductor can be reduced while maintaining the antenna characteristics.

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Inventors:

KURODA SHINICHI (JP)

Application Number:

PCT/JP2003/013185

Publication Date:

May 06, 2004

Filing Date:

October 15, 2003

Export Citation:

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Assignee:

SONY CORP (JP)
KURODA SHINICHI (JP)

International Classes:

H01Q1/38; H01Q1/48; H01Q9/04; H01Q9/06; H01Q9/30; H01Q9/36; H01Q9/38; H01Q9/40; H01Q17/00; (IPC1-7): H01Q9/38; H01Q9/40; H01Q1/48

Domestic Patent References:

WO1996024964A1

1996-08-15

Foreign References:

US6014114A	2000-01-11
JPH09223921A	1997-08-26
JPS418371B1	1966-04-30

Other References: