Electrical device and electrical transmitter-receiver particularly useful in a CT2 cordless telephone
US5204687A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1990 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Jul 19, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/244
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An electrical transmitter-receiver, particularly useful as a CT2 cordless telephone, includes a quarter wavelength antenna rod carried by the housing, and a quarter wavelength antenna coil carried by one end of the antenna rod. The antenna rod is movably mounted through an opening in its housing to a retracted position wherein substantially only the antenna coil is disposed externally of the housing, or to an extended position wherein substantially the complete antenna rod and the antenna coil are disposed externally of the housing. When the antenna rod is in its retracted position an electrical switch connects the antenna coil to the electrical circuit, and when the antenna rod is in its extended position an electrical switch connects the antenna rod to the electrical circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.