Actually we have down-converting and filtered our signal and after up-converting we need a narrow band filter to reject f1+f2 and save f1-f2.
Thanks for you comment, we first down-convert 10Ghz to IF and after some processing we need up-convert to 10Ghz again. In addition as you know the output of mixer (by neglecting intermodualtions) has two different frequency and by knowing that F1+F2 and F1-F1 are close to each other a narrow band-pass filter is required.
Since your laboratory is poor in term of equipment,component; have you ever considered the cost of such ( cavity resonator filter) filter ??unfortunately, In our laboratory we don't have many mixers and also signal generators to up/down convert in different stages
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