DIPLEXER FOR A REFLECTOR ANTENNA

Invention describes diplexer for reflector antenna for transmitting microwave signals. Diplexer comprises common circular signal waveguide to transmit and receive signals, the signal waveguide comprising first and second ends. Common port is provided at the first end. Diplexer further includes waveguide arrangement disposed coaxially relative to the signal waveguide in region of the second end of the signal waveguide, and cylindrical coupler section disposed between the first and second ends of the signal waveguide, and connects the waveguide arrangement to the common signal waveguide. To create first and second coaxial waveguide ports, the waveguide arrangement comprises first circular waveguide in which first signal can propagate when the diplexer is operating, wherein inner conductor is disposed inside the first waveguide, and second circular waveguide in which second signal can propagate at lower frequency than the first signal when the diplexer is operating, wherein the second waveguide surrounds the first waveguide.