A 2.4/3.5/4.9/5.2/5.7-GHz concurrent multiband low noise amplifier using InGaP/GaAs HBT technology

A 2.4/3.5/4.9/5.2/5.7-GHz concurrent multiband low noise amplifier using InGaP/GaAs HBT technology is demonstrated for the first time. Multiband input matching is achieved by newly developed capacitive feedback instead of traditional inductive feedback technique. The experimental results showed that input return loss of -12, -16, -14, -13, and -12 dB, voltage gain of 29, 27, 24, 23.6, and 22.5 dB and noise figure of 2.89, 2.76, 2.95, 2.98, and 3.1 dB were obtained at 2.4/3.5/4.9/5.2/5.7 GHz, respectively.