A new design is presented that combines a low-noise amplifier (LNA) with a new passive base-collector notch filter based on Jazz 0.18μm SiGe technology. Extra capacitor is introduced in notch filter, eliminating the operating-frequency input mismatch in formal base-collector notch filters. Results show that LNA obtains a 4dB S₂₁ enhancement of 14.1dB and a 7dB increase S₁₁ of −15dB at 20.5GHz, image rejection ratio is 33.5dB. IIP3 is 3.43dBm at the operating frequency for a power consumption of 18mW from a 3V power supply.