Filter with pole point(s) in attenuation region - has at least one coupling element replaced by resonator circuit

摘要

The filter has several line resonators separated by coupling elements. At least one coupling elements is replaced by a resonance circuit, whose resonance frequency lies within the filter attenuation range. The impedance value of the resonance circuit at a preset frequency in the pass range of the filter coincides with a preset impedance portion rated value. For a band pass filter function two of the coupling elements are replaced by resonance circuits. One circuit resonance frequency lies in the attenuation range below the pass range, while that of the other circuit lies above the pass range. USE/ADVANTAGE - Filter with several pole points, with simple and compact design.