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The best choise is GaAs FET.
But now from Agilent has many new HEMT for choise.
To design a LNA,to select a device is the first,the key is to design a circuit(include the input match microstrip loss),and just this loss may effect the NF largly.So be very care to design this.
In some way, you may use the suspented circuit type to get low loss .
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