Dual resonance antenna apparatus

Details Dual resonance antenna apparatus Dual resonance antenna apparatus

2005-03-29

2005-03-29

Phan, Tho (Department: 2821)

Communications: radio wave antennas

Antennas

With variable reactance for tuning antenna

C343S749000

Reexamination Certificate

active

06873299

ABSTRACT:
A multi-resonant antenna device includes an antenna element and an LC parallel resonance circuit making the antenna element resonate in a plurality of frequency bands, and the LC parallel resonance circuit includes a T-type circuit or PI-type circuit including an inductance element, acting as a shunt element, and capacitance elements, which prevent the impedance from becoming infinite in a certain frequency band. In this way, a drop, that is, a notch portion, in the frequency characteristic causing deterioration of the gain can be eliminated.

REFERENCES:
patent: 4225822 (1980-09-01), Kariatsumari
patent: 5701107 (1997-12-01), Kasahara et al.
patent: 5963113 (1999-10-01), Ou et al.
patent: 20020025785 (2002-02-01), Satoh et al.
patent: 01-151829 (1989-06-01), None
patent: 2001-36328 (2001-02-01), None
patent: 2001-185936 (2001-07-01), None
patent: 2001-185937 (2001-07-01), None
patent: 2001-185949 (2001-07-01), None
Antenna Engineering Handbook; ISBN 4-274-02677-9; 1980; pp. 44-45.

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