Automobile antenna system
US4717922A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1985 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | Nov 4, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/3275
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention provides an autombile antenna system for detecting surface currents induced on the vehicle body by radio waves. The antenna system includes an electrostatic shielding case mounted on the vehicle body and having an opening formed therein. The opening in the case faces a metallic plate in the vehicle body and a loop antenna is housed within the case and disposed in close proximity to the opening thereof. The loop antenna has a plane of the loop positioned relative to the surface of the metallic vehicle plate at an angle in the range of 90 degrees to 135 degrees or 225 degrees to 270 degrees, whereby the antenna system can more efficiently detect the surface currents induced on the vehicle body by radio waves and can be miniaturized and improved in performance without any externally protruding member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.