Antenna device capable of being commonly used at a plurality...

Details Antenna device capable of being commonly used at a plurality... Antenna device capable of being commonly used at a plurality...

2005-03-08

2005-03-08

Vannucci, James (Department: 2828)

Communications: radio wave antennas

Antennas

With radio cabinet

C343S744000

Reexamination Certificate

active

06864844

ABSTRACT:
In an antenna device10including a line-shaped or belt-shaped first conductor11having an electrically half length of a wave-length of a first resonant frequency, a feed point12to which an end of the first conductor is connected, a plate-shaped second conductor13on which the feed point is located and on which another end of the first conductor is grounded, an impedance element14is loaded halfway on the first conductor and which varies the first resonant frequency, a second resonant frequency, or both the first resonant frequency and the second resonant frequency. Accordingly, a compact antenna device10can therefore be constituted so that an impedance matching between the first conductor11and the feed point12may be readily obtained. In addition, the antenna device10can be commonly used with respect to a multi-frequency operation.

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