In this paper, we design and implement a compact low noise block (LNB) for extended C-band Earth Station in satellite communication systems which converts the radio frequency (RF) signal from extended C-band (3.4 – 3.625 GHz) to a fixed 70 MHz intermediate frequency (IF) signal. The LNB consists of a three-stage low noise amplifier, a band pass filter, a frequency mixer, a local oscillator, IF amplifiers and IF filters. It is fabricated by Rogers RO4350B substrate (εr = 3.48, hsub = 0.762mm, tan δ = 0.0035).