Automobile antenna system
US4707701A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1985 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Oct 25, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/32
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An automobile antenna system for detecting currents induced in a vehicle body by broadcast waves and transmitting the detected current signals to a receiver located in the vehicle body is provided without externally projected antenna poles. The system comprises high-frequency pickup means longitudinally disposed along and in close proximity with the marginal edge portion of the vehicle body, the pickup means being effective to detect surface high-frequency currents which are induced on the vehicle body and concentrated into the marginal edge of the vehicle body, for example, a vehicle roof panel, a rearwindow frame or a vehicle fender. The pickup means is spaced away from the marginal edge of the vehicle body within a range represented by the following formula: 12.times.10.sup.-3 c/f(m) where c=the velocity of light and f=the carrier frequency of broadcast waves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.