Antenna device having enhanced reception sensitivity in wide...

Details Antenna device having enhanced reception sensitivity in wide... Antenna device having enhanced reception sensitivity in wide...

2008-01-01

2008-01-01

Dinh, Trinh Vo (Department: 2821)

Communications: radio wave antennas

Antennas

High frequency type loops

C343S745000, C343S895000

Reexamination Certificate

active

11363914

ABSTRACT:
An antenna device includes a rectangular parallelepiped base member made of a dielectric or magnetic material, a band-shaped first radiation conductor, including a plurality of divided first radiation conductor portions, spirally wound around the base member, a plurality of variable capacitance elements connected between pairs of adjacent portions and disposed on a upper surface of the base member, and a feeding conductor for supplying a tuning voltage to the variable capacitance elements. The first radiation conductor has first radiation conductor parts respectively formed on upper, lower, and rear side surfaces of the base member and first connecting through-holes passing through the upper and lower surfaces are provided in the base member, and the first radiation conductor part on the upper surface and the first radiation conductor part on the lower surface are connected to each another by the first through-holes, and the feeding conductor is disposed on the front surface of the base member.

REFERENCES:
patent: 3946397 (1976-03-01), Irwin
patent: 0863571 (1998-09-01), None
patent: 1557902 (2005-07-01), None
patent: 1580841 (2005-07-01), None
patent: 51-83755 (1976-07-01), None
patent: 2003-101322 (2003-04-01), None
European Search Report dated Apr. 6, 2006 from corresponding European Application No. 06003971.6—2220.

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