Q-band block down converter

A radiofrequency down converter, comprising:

• an input port to receive a radiofrequency input signal;
• a first bandpass filter comprising a microwave waveguide, the first bandpass filter being coupled to the input port and being configured to filter the radiofrequency input signal;
• a mixer stage coupled to the first bandpass filter, the mixer stage being configured to generate a mixer output signal by processing the filtered radiofrequency input signal using a gain adjustment device, one or more amplifiers, and a frequency mixer;
• a signal adjustment stage coupled to receive the mixer output signal, the signal adjustment stage comprising:
• a first temperature compensation device that is located at a first point in a signal path and that is configured to compensate for changes in signal gain or attenuation due to changes in temperature;
• a second bandpass filter;
• a gain adjustment device;
• a second temperature compensation device that is located after the gain adjustment device at a second point in the signal path and that is configured to compensate for changes in signal gain or attenuation due to changes in temperature;
• one or more amplifiers;
• and a low pass filter;
• and
• an output port coupled to output an adjusted mixer output signal from the signal adjustment stage.