Antenna, earphone antenna, and broadcasting receiver...

Details Antenna, earphone antenna, and broadcasting receiver... Antenna, earphone antenna, and broadcasting receiver...

2008-02-11

2009-06-02

Le, HoangAnh T (Department: 2821)

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

C343S702000, C333S202000, C333S026000

Reexamination Certificate

active

07542007

ABSTRACT:
An antenna of the present invention includes a coaxial cable, antenna elements (3aand3b), and an unbalanced/balanced converter. The unbalanced/balanced converter has a high-pass circuit provided between an input terminal port1and an output terminal port2and a low-pass circuit provided between the input terminal port1and an output terminal port3. Moreover, the high-pass circuit rejects frequencies within a VHF band, and the high-pass circuit and the low-pass circuit both pass frequencies within a UHF band. In response to a signal, inputted to the input terminal port1, which falls within the UHF band, the high-pass circuit and the low-pass circuit output signals that are inverted in phase and equal in amplitude with respect to each other. Therefore, the antenna has high transmission and reception sensitivity in a wide frequency range, i.e., in the VHF and UHF bands. This makes it possible to provide an antenna having high transmission and reception sensitivity in a wide frequency range.

REFERENCES:
patent: 4654883 (1987-03-01), Iwata
patent: 6806836 (2004-10-01), Ogawa et al.
patent: 7483727 (2009-01-01), Zhu et al.
patent: 2005-64742 (2005-03-01), None

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