Device at filters
US6549103B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 2001 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | Mar 29, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/2082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a device at filters for filtering unwanted signals from radio transmitters and/or for use during combination of radio transmitters. Said filter (1) has at least one cavity (2 and/or 3) for filtering radio signals. At least one compensating means (13 and/or 16) is provided to compensate for deviations in frequency depending on expansion or contraction of the cavity (2 and/or 3) due to expansion or contraction of the filter (1) when said filter is heated or cooled during operation. The filter (1) has at least one cavity (2 and/or 3) which is designed for simultaneous filtering of radio signals of at least three different modes (A, B and C and/or D, E and F) and the same frequency. The compensating means (13 and/or 16) is provided in said cavity (2 and/or 3) for compensating deviations in frequency by simultaneously affecting the radio signals of the at least three different modes (A, B and C and/or D, E and F).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.