Antenna apparatus for vehicle-mounted receiver/transmitter equipment with automatic antenna length control
US4506266A · kind A · utility
7Cited by
5References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1982 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Oct 21, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/103
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna for a vehicle-mounted receiver/transmitter includes: a driver for extending and retracting an antenna connected to the receiver/transmitter; a selector for selecting a frequency to be received and/or transmitted by the receiver/transmitter; and a controller which operates in response to an output from the frequency selector for causing the driver to extend and retract the antenna by the length corresponding to the frequency, and for retracting almost the entire antenna into the body of the vehicle when the receiver/transmitter is not operating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.