HOW TO GIVE PROPER VALUE FOR THE RESISTORS

As describing in the picture,how to choosing the resistor values for the GaAs FET Bias , and anyone who have the papers about the gate current and dynamic voltage in Gate,[/img]

If you want to find gate current you should know the equivalent circuit of fet that u are intented to use.Some manufacturers give the equivalent circuit model in the datasheets and some of them gives application notes about biasing fets look avagotech's application notes.In practise there is small amount of current flow into gate because FETs input resistance is very very high.