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US 11,962,290 B2Granted
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 with a band pass filter having input and output interfaces connected to a radio frequency transmission line, the band pass filter being chosen so as to transmit signals within a predetermined frequency range having a filter passband response, the band pass filter comprising resonators generating passband amplitude peaks within the filter passband response of the band pass filter, wherein the filter correction unit has a first bus connected to the radio frequency transmission line and to the band pass filter, wherein the filter correction unit comprises at least one surface acoustic wave (SAW) transducer, each SAW 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, a frequency dependent loss of the SAW transducer being adapted to match an amplitude of a transmitted signal with a factor being an inverse of the filter passband response of the band pass filter reducing the amplitude of the passband amplitude peaks to flatten a frequency response of the passband.
A filter correction unit for use with a band pass filter having input and output interfaces connected to a radio frequency transmission line including a first and second bus, the band pass filter being chosen so as to transmit signals within a predetermined frequency range having a filter passband response, the band pass filter comprising resonators generating passband amplitude peaks within the filter passband response of the band pass filter, wherein the filter correction unit comprises at least one surface acoustic wave (SAW) transducer, each SAW transducer having two electrodes on a piezoelectric substrate where a first electrode is connected to the first bus and the other electrode connected to the second bus and being connected in parallel to the band pass filter along the radio frequency transmission line, a frequency dependent loss of the SAW transducer being adapted to match an amplitude of a transmitted signal with a factor being an inverse of the filter passband response of the band pass filter reducing the amplitude of the passband amplitude peaks to flatten a frequency response of the passband.
Dependencies are inferred from the claim text.