Antenna apparatus for capacitively coupling an antenna ground pl

Details Antenna apparatus for capacitively coupling an antenna ground pl Antenna apparatus for capacitively coupling an antenna ground pl

1994-01-24

1995-08-08

Hajec, Donald

Communications: radio wave antennas

Antennas

With radio cabinet

343847, 343882, 343888, 343906, H01Q 124

Patent

active

054403154

ABSTRACT:
An antenna apparatus for a hand-held symbology reader device having a housing and an elongated one-quarter wavelength antenna. A rotatable coupling member has an L-shaped conductor fixedly and electrically coupled to the antenna by a first end thereof. A second end of the L-shaped conductor is rotatably received by the housing. A ground plane of an electrically conductive material, having a plastic film coated thereon, is positioned within the housing. A washer of an electrically conductive material is electrically coupled to the second end of the L-shaped conductor, and is positioned in face-to-face juxtaposition with a portion of the ground plane. The washer and the portion of the ground plane form a parallel plate capacitor, with the plastic film forming a dielectric therebetween to capacitively couple the ground plane to the antenna. The antenna may be repeatedly rotated from an upright, transmitting/receiving position to a stowed position, without damage to the device or electrical disconnection between the antenna and the ground plane.

REFERENCES:
patent: 2204861 (1940-06-01), Knapp
patent: 2895752 (1959-07-01), Bassie
patent: 4791426 (1988-12-01), Lindenmeier et al.
patent: 4794319 (1988-12-01), Shimazaki
patent: 4825217 (1989-04-01), Choi
patent: 4916456 (1990-04-01), Shyu
patent: 4931806 (1990-06-01), Wunderlich
patent: 5271684 (1993-12-01), Phillips

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