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US 2020/0403602 A1Published application
Correction unit for radio frequency filter
AssigneeKongsberg Defence & Aerospace AS
InventorsBjørn Holst PETTERSEN, Stig ROOTH
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AssigneeKongsberg Defence & Aerospace AS
InventorsBjørn Holst PETTERSEN, Stig ROOTH
Estimating the term…
The present invention relates to a filter correction unit (203a) as well as an RF filter including the correction unit for use in radio frequency transmission lines including a band pass filter (201) having input and output interfaces mounted in the signal transmission line. The filter (201) is chosen so as to transmit signals within a predetermined frequency range, the quality factor of the filter having predetermined limitations generating a known distortion to the signal. The correction unit (203a) has a first bus connected to said transmission line and to said filter, wherein the correction unit comprises at least one surface acoustic wave (SAW) transducer (204a-n), each transducer having two electrodes on a piezoelectric substrate where a first electrode is connected to said first bus and the other electrode connected to a second bus, the SAW transducer being adapted to distort a transmitted signal with a factor being the inverse of said known distortion of the filter (201).
A filter correction unit for use in radio frequency transmission lines, the transmission lines including a band pass filter having input and output interfaces mounted in the signal transmission line, the band pass filter being chosen so as to transmit signals within a predetermined frequency range having a filter passband response, the quality factor of the filter's resonators having predetermined limitations generating a known passband distortion of the filter to the signal, wherein the correction unit has a first bus connected to the transmission line and to the filter, wherein the correction unit comprises at least one surface acoustic wave (SAW) transducer, each transducer having two electrodes on a piezoelectric substrate where a first electrode is connected to the first bus and the other electrode connected to a second bus, the SAW transducer being adapted to distort the amplitude of a transmitted signal with a factor being the inverse of the known distortion of the filter.
Dependencies are inferred from the claim text.