Looking for RF-low-IF downconverter (Rf. 2.4Ghz, or 5.8GHz) IF (< 50MHz)

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Hi!

I have a IF-Tranceiver and I need to RF front end to amplify,
downconvert RF signal at 2.4 or 5.8 GHz to IF (no more than 50MHz)
since I apply Low-IF architecture and my ADC samplying rate is at most
100M samples/second.
I have been doing product research for days but have not got
anything I want.
If you know such products.. or any suggestions on searching are
welcome... I have no experience in buying such products and do not even
know how to look for them.

Thank you!

David

p.s. sorry for duplicate this post.