Microwave variable temperature noise source at normal temperature output port
A technology of output port and output noise, which is applied in the field of microwave variable temperature noise source, and can solve the problem that the noise figure parameter is difficult to measure accurately
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[0018] refer to figure 1 , figure 2 . exist figure 1In the described embodiment of a microwave variable temperature noise source with a normal temperature output port for ultra-low microwave noise testing, the variable temperature noise source mainly includes a refrigerator 1 in a low-temperature Dewar 4 in a vacuum environment, connected to the refrigerator 1 The cooling head 2 on the main shaft radiates a microwave load 5 that generates thermal noise. The refrigerator 1 adopts a Stirling refrigerator. The microwave load 5 of the noise source, the microwave heat-insulated transmission line 6, and the microwave coaxial output port 8 are equipped with distributed temperature sensors 7 for monitoring the physical temperature of the microwave path. The machine 1 and the low-temperature Dewar 4 construct a low-temperature environment. The microwave load 5 is radially fixedly connected, and one end is connected to the microwave heat-insulated transmission line 6 of the normal...
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