Double stage Low Noise Amplifier at 1.27 GHz for Synthetic Aperture Radar application

Abstract

Synthetic Aperture Radar (SAR) is radar technology for remote sensing which transmits electromagnetic pulse to earth where the pulse is reflected back to SAR and received by antenna receiver. The received signal is very low, it should be amplified by Low Noise Amplifier (LNA). To satisfy the SAR system, this paper propose to design a double stage LNA which operate at 1.27 GHz. In the design process, it used active component BJT Transistor of BFP 640 for the both stage. While to achieve the impedance matching condition is deployed on an FR4 substrate which has 4.6 of dielectric permittivity. The Advanced Design System (ADS) is applied to determine gain, voltage standing wave ratio (VSWR), and noise figure (NF) as LNA characterization. The simulation results at 1.27 GHz recorded 42.10 dB of gain, 1.87 of NF, while input VSWR and output VSWR are 1.15 and 1.25 respectively.