Hyper frequency low pass filter has coaxial structure with inner and outer conductive armatures carrying series of concentric plates

摘要

The Hyper frequency filter has a coaxial structure with an external conductive armature (1,1',1'') and an inner conductive armature (2,2',2'') extending axially. The armatures define a series of concentric plates (3A-3D) along an axial direction and defining successive sections of a low impedance line characteristic and a high impedance line characteristic. The concentric plates are formed in a block of foam plastic. Claims include a method of fabrication of the claimed filter.