Vehicle antenna system
US4804968A · kind A · utility
4Cited by
35References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1986 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Aug 6, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/3291
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention provides a vehicle antenna system including a high frequency pickup with a loop antenna for detecting high frequency surface currents induced on the vehicle body by broadcast waves and concentratedly flowing on the marginal portions of the vehicle body, the loop antenna being longitudinally disposed in close proximity to a marginal portion of the vehicle body, the improvement including a switching diode on the loop antenna for changing the opening area thereof. Therefore, the loop antenna can stably receive waves through an increased range of bands independently of variations in power voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.