Device for the filtering of electromagnetic waves propagating in a rotational symmetrical waveguide, with inserted rectangular filtering waveguide sections

A device for filtering electromagnetic waves comprising:

• an input circular waveguide element having an axis of symmetry perpendicular to a first circular end, the input circular waveguide element receiving electromagnetic waves;
• a plurality of rectangular waveguide elements having a first and a second rectangular end perpendicular to the axis of symmetry, wherein at least one rectangular waveguide element is connected to the input circular waveguide element;
• an intermediate circular element wherein the axis of symmetry is perpendicular to a first and a second circular end;
• an output circular waveguide element connected to a second of the plurality of rectangular waveguide elements wherein the axis of symmetry is perpendicular to a second circular end and wherein the output circular waveguide element filters electromagnetic waves;
• wherein the rectangular ends of the plurality of rectangular waveguide elements is closed with a metal wall, each of the metal walls having a circular opening which corresponds to the circular ends of the input, intermediate and output circular waveguide elements;
• and
• wherein the input, intermediate and output circular waveguide elements have identical diameters.

A device for filtering electromagnetic waves comprising:

• an input coaxial waveguide element in TE.sub.11 mode having an axis of symmetry perpendicular to a first circular end, the input coaxial waveguide element receiving electromagnetic waves;
• a rectangular waveguide element connected to the input circular waveguide element oriented such that the axis of symmetry is perpendicular to a first and second rectangular end;
• an output coaxial waveguide element in TE.sub.11 mode connected to the rectangular waveguide element wherein the axis of symmetry is perpendicular to a second circular end, and wherein the output coaxial waveguide element filters electromagnetic waves;
• wherein the first and second rectangular ends are closed with a first and second metal wall, respectively;
• the first and second circular ends correspond to circular openings made in the first and second metal walls;
• and
• the input coaxial waveguide element has a diameter which is equal to a diameter of the output coaxial waveguide element.