Patent ID: 8885340

Claim:
A low noise amplifier device for receiving a radio frequency signal from a satellite or a space object comprising an amplifier kept in a sealed chamber defined by a wall of a cryostat, and comprising a cryogenic cooler attached to the exterior of the cryostat at a face of the wall wherein the amplifier is: maintained in the sealed chamber secured to a mounting surface located at the end of a cold finger of the cryogenic cooler, of which the mounting surface of the cold finger is made of a material of good conductance of heat, the cold finger traversing without direct contact the face of the wall; connected to an input coupler at an input of the amplifier and an output coupler at an output of the amplifier, the said input coupler and output couplers traverse the wall of the cryostat; the amplifier inside the cryostat functioning on the one hand at an ambient temperature around 288 Kelvin and the other at a cryogenic temperature well below room temperature; and wherein the sealed chamber of the cryostat contains, at least during operation mode at cryogenic temperature, a gas at a pressure between the pressure outside the cryostat and a pressure of approximately 0.1 millibar.