Patent ID: 11962290

Abstract:
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).