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A 20-GHs band monolithic GaAs FET low-noise amplifier has been developed. Design and fabrication were performed by obtaining the transmission properties of the microstrip lines on a semi-insulating GaAs substrate. The developed monolithic amplifier consists of a submicron gate GaAs MESFET and the input and output distributed matching circuits on a semi-insulating GaAs substrate measuring 2.75 mm x 1.45 mm. A noise figure of 6.2dB and an associated gain of 7.5 dB were obtained at 21 GHz without any additional tuning adjustments.