Diplexer for a Reflector Antenna

A diplexer for a reflector antenna for transmitting microwave signals, comprising:

• a common circular signal waveguide to transmit and receive signals, the waveguide comprising a first end and a second end, wherein a common port is provided at the first end;
• a waveguide arrangement disposed coaxially relative to the common circular signal waveguide in a region of the second end of the common circular signal waveguide;
• a cylindrical coupler section disposed between the first and second ends of the common circular signal waveguide and connecting the waveguide arrangement to the common circular signal waveguide,
• wherein a first and second coaxial waveguide port are created by the waveguide arrangement comprising
• a first circular waveguide that propagates a first signal when the diplexer is operating, wherein an inner conductor is disposed inside the first circular waveguide, and
• a second circular waveguide that propagates a second signal at a lower frequency than the first signal when the diplexer is operating, wherein the second waveguide surrounds the first waveguide.