Antenna device capable of being tuned in wide band

Details Antenna device capable of being tuned in wide band Antenna device capable of being tuned in wide band

2006-07-04

2006-07-04

Chen, Shih-Chao (Department: 2821)

Communications: radio wave antennas

Antennas

High frequency type loops

C343S787000, C343S895000

Reexamination Certificate

active

07071887

ABSTRACT:
The present invention provides an antenna device capable of automatically obtaining excellent receiving sensitivity over a wide band. The antenna device comprises a rod-shaped base made of a dielectric material or a magnetic material; a stripe-shape radiating conductor divided into a plurality of radiating conductors wound around the base; and variable capacitive elements provided to correnspond to the same number of the radiating conductors. The radiating conductors and the variable capacitive elements are alternatively arranged on the base and are connected in series to each other, the radiating conductor having its one end connected to the variable capacitive element serves as an opening side and the variable capacitive element having its one end connected to the radiating conductor serves as a signal feeding side, and capacitance values of the variable capacitive elements increase or decrease in the same direction to be tuned to a predetermined frequency.

REFERENCES:
patent: 3427624 (1969-02-01), Wanselow et al.
patent: 3573840 (1971-04-01), Gouillou et al.
patent: 3946397 (1976-03-01), Irwin
patent: 4873527 (1989-10-01), Tan
patent: 51-83755 (1976-07-01), None
patent: 2003-318636 (2003-11-01), None

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