Ultra high frequency band pass filter for radar, has microwave strip forming resonant circuits, where filtering line is connected in parallel with circuits to attenuate harmonics of resonance central frequency of circuit

摘要

#CMT# #/CMT# The filter has a substrate of dielectric material including a metal coated face with a metallic microwave strip (34). The strip is of a specific length and forms a set of adjacent resonant circuits (R1-R6), where each circuit has a resonance central frequency. An inlet line (Le) accesses an ultra high frequency signal to be filtered and an outlet line (Ls) outputs the filtered signal. A filtering line (50) is connected in parallel with the resonant circuits for attenuating the harmonics of resonance central frequency of the circuit. #CMT#USE : #/CMT# Used for a radar to filter the harmonics of a resonance central frequency of a resonant circuit. #CMT#ADVANTAGE : #/CMT# The filtering line is connected in parallel with the resonant circuits for strongly attenuating the second and third harmonics of the resonance central frequency of the resonant circuit of the filter without degrading the initial performance of the filter and the filter lines. The filtering line permits to strongly reject the narrow frequency band. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a diagram of ultra high frequency band pass filter. Le : Inlet line Ls : Outlet line R1-R6 : Resonant circuits 34 : Metallic microwave strip 50, 52, 56, 58 : Filtering lines.