Unbalanced power feeding antenna device for making radio...

Details Unbalanced power feeding antenna device for making radio... Unbalanced power feeding antenna device for making radio...

2006-08-02

2008-03-25

Ho, Tan (Department: 2821)

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

C343S860000, C343S822000, C333S168000, C455S180200

Reexamination Certificate

active

07348931

ABSTRACT:
An antenna device which is connected to a radio module performing radio communications with a system using a first band and a system using a second band, has an antenna element which transmits/receives radio signals in the first and second bands. The antenna device has first and second matching circuits corresponding to the first and second bands, and also disposes a switching circuit between the first and second bands and the radio module. A first filter circuit is connected between the first matching circuit and the antenna element. The first filter circuit passes the radio signal in the first band and also attenuates the radio signal in the second band. Meanwhile, a second filter circuit is connected between the second matching circuit and the antenna element. The second filter circuit passes the radio signal in the second band and also attenuates the radio signal in the first band.

REFERENCES:
patent: 7212789 (2007-05-01), Kuffner
patent: 2004/0130667 (2004-07-01), Hibino et al.
patent: 2005/0085202 (2005-04-01), Ella et al.
patent: 2007/0066243 (2007-03-01), Yamauchi et al.
patent: 2007/0190954 (2007-08-01), Murakami et al.
patent: 2003-347959 (2003-12-01), None

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