Controllable filter
US6381446B1 · kind B1 · utility
5Cited by
4References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1999 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Aug 2, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/465
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The application relates to a controllable filter (1) that is placed between an antenna on the one side and a receiver and transmitter on the other, where the receiver branch can be switched between two filter characteristics. In this way, a simple device for allowing simplex reception in the transmission band can be provided. This filter is preferably applied as a frontend filter (FP) in the fixed part of a cordless telephone system and/or in a mobile station to thereby provide said mobile station with walkie-talkie capabilities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.