Normal-temperature output port microwave variable-temperature noise source

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

Active Publication Date: 2014-05-21
10TH RES INST OF CETC
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  • Abstract
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AI Technical Summary

Problems solved by technology

To solve the problem that the noise figure parameters of many microwave ultra-low noise amplifiers and similar products or systems are difficult to measure accurately

Method used

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  • Normal-temperature output port microwave variable-temperature noise source
  • Normal-temperature output port microwave variable-temperature noise source

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Embodiment Construction

[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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Abstract

The invention provides a normal-temperature output port microwave variable-temperature noise source, and aims to provide a microwave noise source, wherein the physical temperature of an output port of the noise source is at normal temperature, the equivalent output noise temperature can vary from 50K to 200K, and the noise source can be used for measuring ultralow noise factors of a microwave ultralow noise amplifier provided with a normal-temperature input port. According to the technical scheme, the normal-temperature output port microwave variable-temperature noise source is formed through the following steps: a microwave load (5) of the noise source, a microwave thermal insulation transmission line (6) and a microwave coaxial output port (8) are respectively provided with temperature sensors (7), wherein the temperature sensors (7) are distributed for monitoring the physical temperature of a microwave closed circuit; a cold head fixedly connected to a mains haft of a refrigerator (1) and the temperature sensors arranged on the microwave thermal insulation transmission line (6) in an array are sealed inside a low-temperature dewar (4), the cold head (2) in the dewar (4) is connected with a monitoring control circuit (3) through a temperature monitoring control line, and the microwave thermal insulation transmission line (6) passes through the normal-temperature microwave coaxial output port (8) outside a vacuum cavity wall in the radial direction.

Description

technical field [0001] The invention relates to a microwave variable temperature noise source for measuring the noise figure of a microwave ultra-low noise amplifier in the electronic field, more specifically, the invention relates to a method for measuring the noise figure of a microwave ultra-low noise amplifier with ultra-low noise performance Parameters of microwave noise sources. It can be considered that the present invention can also be used for the amplitude linearity performance of microwave receivers such as the noise figure measurement of other similar microwave circuits with ultra-low noise performance and the microwave radiometer, except for the measurement of the noise figure of the microwave ultra-low noise amplifier. test. Background technique [0002] As we all know, noise is a natural phenomenon and a form of motion of matter. Noise is unavoidable in electronic equipment and systems. Generally speaking, noise is harmful, because the interference of noise ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26
Inventor 黄凯冬黄坤超毛怡黄安君李玥明治中叶晓书杜晓明
Owner 10TH RES INST OF CETC
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