Floating microwave filter in a waveguide structure
View Patent ↗A floating microwave filter in a waveguide structure comprises filtering elements sandwiched between two foam half-bars that are placed inside a waveguide. The filtering elements are metal features etched in the surface of one of the two foam half-bars and the waveguide is an internally hollowed-out block of foam having a metallized external surface.
1. Floating microwave filter in a waveguide structure, comprising filtering elements sandwiched between two foam half-bars that are placed inside a waveguide, wherein one of the two foam half-bars comprises the filtering elements made of metal features and the waveguide is an internally hollowed-out block of foam having a metallized outer surface.
2. Filter according to claim 1 , wherein the foam waveguide has a rectangular cross section and an internal cavity of circular cross section.
3. Filter according to claim 1 , wherein the foam waveguide has a circular cross section and an internal cavity of rectangular cross section.
4. Filter according to claim 1 , wherein the foam waveguide has a rectangular cross section and an internal cavity of rectangular cross section.
5. Filter according to claim 1 , wherein the surface of the foam bar on which the metal features are placed is crenellated.
6. Process for manufacturing a floating filter in a waveguide structure comprising elements sandwiched between foam half-bars that are placed inside a waveguide, the process comprising a step of forming the metal features constituting the filtering elements by spraying a metal paint onto the surface of one of the foam half-bars.
7. Process for manufacturing a floating filter in a waveguide structure comprising elements sandwiched between foam half-bars that are placed inside a waveguide, the process comprising a step of forming the metal features constituting the filtering elements by brushing on a metal paint onto the surface of one of the foam half-bars.