2021. Design narrow-band frequency amplifier (1.5GHz -1.6GHz) based on InGaP Heterojunction Bipolar Transistor (HBT) and GaAs HBT. Journal of Engineering. 27, 2 (Feb. 2021), 13–26. DOI:https://doi.org/10.31026/j.eng.2021.02.02.