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Is it possible, under current technology, to have an electronic filter in the microwave range (100 MHz to 300 GHz) with very low bandwidth , say 100 to 1000 Hz?

If yes, then what is the basic technology behind it? Any example would be great. Smallest bandwidth filters I am aware is that of GSM mobiles at 200kHz.

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  • $\begingroup$ Are you willing to design & fab your own? $\endgroup$
    – Carl Witthoft
    Commented Nov 3, 2017 at 10:57
  • $\begingroup$ A better match in electrical engineering... $\endgroup$
    – Solar Mike
    Commented Nov 5, 2017 at 11:27

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