Automobile antenna system
US4742567A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1986 |
| Grant date | May 3, 1988 |
| Priority date | — |
| Expiry date | Jan 30, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/0825
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An automobile antenna system composed of two antennas are attached to the rear windshield of a vehicle body. A high-frequency pickup is provided on the front pillar of the vehicle body for detecting the lowering of the output level of the main antenna in advance, and an antenna selecting signal generator actuates a switch circuit so that the main antenna, the output level of which is predicted to dip after a predetermined lapse of time, is changed over to the sub antenna, in which no dipping is occurring, whereby the output level of the diversity-reception antenna is maintained at a predetermined value or higher even when the vehicle drives into an area where stationary waves are being produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.