Antenna apparatus for transponder

Details Antenna apparatus for transponder Antenna apparatus for transponder

2007-05-30

2008-11-18

Owens, Douglas W. (Department: 2821)

Communications: radio wave antennas

Antennas

With housing or protective covering

C343S717000, C343S755000, C343S793000, C343S795000, C343S866000

Reexamination Certificate

active

07453415

ABSTRACT:
An antenna apparatus is mounted at a wheel rim as a transponder of a system for monitoring a tire pressure or the like, and attached at an end portion of an air valve. The apparatus includes a circuit board having an electronic circuit portion and a grounding conductor layer, a sheet-metal inverse-F type antenna element, a sheet-metal shield case conducting to the grounding conductor layer to cover the electronic circuit portion, and a resin case for accommodating these components. One side surface extending in a longitudinal direction of a space defined between the circuit board and the radiating conductor of the antenna element faces one of sidewalls of a tire, and the other side surface thereof faces a wall surface of the wheel rim with a distance interposed therebetween, the distance being about one-fourth of a wavelength of a radio wave to be used.

REFERENCES:
patent: 6157302 (2000-12-01), Kolton et al.
patent: 7050017 (2006-05-01), King et al.
patent: 7059178 (2006-06-01), Fischer et al.
patent: 7196618 (2007-03-01), Chen
patent: 2003/0066343 (2003-04-01), Fischer et al.
patent: 10-44726 (1998-02-01), None
patent: 2006-306184 (2006-11-01), None

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