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ADRF5515 channel to channel isolation - Q&A - RF and Microwave - EngineerZone (analog.com)
thanks for posting the layout here. The layout looks ok from here with nice RF practices including vias.
I noticed you use 100pF and 100nF decoupling capacitors for LNA supplies. Please use 1nF and 10uF supply caps to LNA. We know that choosing correct…