Antenna apparatus for capacitively coupling an antenna ground plane to a moveable antenna
US5440315A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1994 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Jan 24, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/084
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.