A kind of high frequency broadband millimeter wave noise source and preparation method thereof

Abstract

The invention discloses a high-frequency broadband millimeter-wave noise source and a preparation method thereof, wherein the millimeter-wave noise source comprises: a bias circuit, an avalanche diode, a suspension-strip matching circuit and a microstrip-coaxial converter are sequentially connected , in order to ensure the constant working current of the avalanche diode, an overvoltage protection circuit is set between the bias circuit and the avalanche diode in the structure, which has the characteristics of high isolation output and low noise output voltage to ensure that the avalanche diode works in constant current state. At the same time, the sling matching circuit structure is adopted, which can extend the frequency range to 110GHz, so as to achieve stable output of high-frequency broadband noise signals; the final stage is converted through a microstrip-coaxial converter to achieve stable signal output. The output method of microstrip to coaxial is used to replace the traditional noise source waveguide to coaxial form, which improves the super-noise ratio and optimizes the standing wave ratio.

Description

technical field [0001] The invention relates to the technical field of millimeter-wave broadband noise sources, in particular to a high-frequency broadband millimeter-wave noise source and a preparation method. Background technique [0002] Noise figure measurement occupies an important position in the field of microwave and millimeter wave measurement. In the test of noise characteristics, the noise source is an important component, and its accuracy has a significant impact on the accuracy of the final noise test. With the continuous development of millimeter-wave technology, it is difficult for traditional solid-state noise sources to achieve stable output of high-frequency noise signals, especially to generate high-frequency broadband signals above the Ka-band. At present, the traditional millimeter-wave broadband noise sources are generated in such a way as figure 1 As shown, a constant current source is applied to the avalanche diode, white noise is generated by the a...

AI Technical Summary

Problems solved by technology

In order to realize the impedance matching of broadband high-frequency noise signals, a new type of suspension matching circuit is designed, which can extend the frequency range to 110GHz; the overall circuit adopts a planar structure, which reduces the difficulty of processing and assembly and reduces the transmission process. loss; the signal output adopts microstrip to coaxial to replace the form of waveguide to coaxial, which ensures the super-noise ratio and standing wave ratio of the output signal, which is more convenient for testing and use, and solves the complex conversion of existing circuit structures and the difficulty of processing and assembly. , the problem of low super-noise ratio

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