Device at filters

• Main Author: Jilong, Ju
• Format: Patent
• Language: English
• Published: 15.04.2003

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, wherein said filter has at lease one cavity for filtering radio signals, and wherein at least one compensating means is provided to compensate for deviations in frequency depending on expansion or contraction of the cavity due to expansion or contraction of the filter when said filter is heated or cooled during operation, 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 () has at least one cavity (and/or ) for filtering radio signals. At least one compensating means (and/or ) is provided to compensate for deviations in frequency depending on expansion or contraction of the cavity (and/or ) due to expansion or contraction of the filter () when said filter is heated or cooled during operation. The filter () has at least one cavity (and/or ) 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 (and/or ) is provided in said cavity (and/or ) 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).