Patent ID: 11962290
Assignee: KONGSBERG DEFENCE & AEROSPACE AS
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. 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.