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Method for measuring single terminal port test microwave cavity filter interstage coupling coefficient

A technology of coupling coefficient and microwave cavity, which is applied in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve problems such as difficulty in achieving technical consistency, inconvenient test operation, and error in test results. Achieve the effects of avoiding complexity and inconvenience, improving accuracy and convenience, and saving costs

Inactive Publication Date: 2008-11-12
10TH RES INST OF CETC
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  • Application Information

AI Technical Summary

Problems solved by technology

This technical requirement to make the cavity of the test accessory completely consistent with the cavity of the filter is not only limited by the processing technology, but also difficult to achieve technical consistency, which also brings inconvenience to the test operation
Inconsistency errors due to processing technology limitations will inevitably lead to certain errors in test results and low test accuracy

Method used

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  • Method for measuring single terminal port test microwave cavity filter interstage coupling coefficient
  • Method for measuring single terminal port test microwave cavity filter interstage coupling coefficient
  • Method for measuring single terminal port test microwave cavity filter interstage coupling coefficient

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Embodiment Construction

[0029] figure 1 Among them, according to the test method of the present invention, a computer equipped with a data acquisition and analysis software program and a high-performance test instrument are provided. Connect the test instrument and the tested part, use a computer with data acquisition and analysis software program, connect the test instrument through the GPIB interface, and establish a test platform. Through the GPIB interface of the test instrument, connect the test computer with a GPIB interface card. Connect the vector network analyzer and computer through GPIB interface and GPIB cable. The test instrument can be a vector network analyzer. Connect the test cable on one port of the vector network analyzer to the device under test, and perform state calibration on the test instrument before testing.

[0030] Measure the reflection parameter S11 of the DUT through the network analyzer and transmit the test data to the personal computer through the GPIB interface,...

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Abstract

The invention relates to a method for measuring interstage coupling factors of the filter of a microwave cavity in a manner of one-port measurement, which comprises the steps that: a measuring instrument is connected with a computer provided with a data acquisition software program and a testing platform with a piece to be measured is established; the reflectance S11 of the piece to be measured is measured at one port of the measuring instrument and is transmitted to a personal computer by a GPIB interface; coupling factors are calculated in the computer, the frequency marker of a network analyzer is moved and the transmission zero of the S11 is found at a measuring curve; the coupling factor M12 of a first cavity and a second cavity and the coupling factor M23 of the second cavity and a third cavity or the coupling factor M34 of the third cavity and a fourth cavity are calculated according to a formula. The method of the invention adopts the one-port measurement, needs no independent processing measurement of nearby components and can measure directly at the filter needing debugging, thereby avoiding the complexity and inconvenience of interstage coupling factors during processing and testing of accessories for subsidiary in the prior art, reducing cost and having high measuring precision.

Description

technical field [0001] The invention relates to a microwave cavity filter and a method for measuring the interstage coupling coefficient of a microwave coaxial cavity filter. Background technique [0002] In the prior art, the method for measuring the interstage coupling coefficient of a microwave coaxial cavity filter usually adopts a two-port transmission test method. In this method, the transmission parameters of two identical microwave resonators are tested, and then the coupling coefficient between the two resonators is obtained through calculation, and the interstage coupling coefficient of the coaxial cavity filter is calculated and measured. The system connection block diagram of its test principle is as follows: figure 2 shown. When testing, the figure 2 The port 1 and port 2 of the network analyzer 4 are respectively connected to the two ports of the coupling coefficient test accessory 3 through test cables. It measures the insertion loss at the center frequenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
Inventor 唐波
Owner 10TH RES INST OF CETC
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