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Structure and Determination Method of Measuring Impedance Transformer Balance and Its Network Parameters

A technology for measuring network parameters and impedance, which is applied in the field of communication, can solve problems such as balance port mismatch, and achieve the effect of fewer components, strong operability, and simple principle

Active Publication Date: 2017-10-17
THE 22ND RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some network analyzers are also used. The available information shows that the balance port mismatch is serious during the test, especially when measuring the balance of the impedance transformer with a large transformation ratio.

Method used

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  • Structure and Determination Method of Measuring Impedance Transformer Balance and Its Network Parameters
  • Structure and Determination Method of Measuring Impedance Transformer Balance and Its Network Parameters
  • Structure and Determination Method of Measuring Impedance Transformer Balance and Its Network Parameters

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Embodiment Construction

[0042] The balance degree of the measuring impedance transformer and its network parameter structure of the present invention, the method is based on the auxiliary measurement network, for the commonly used 1:N (N=2, 4, 6, 9), that is, when N>1 , balanced-unbalanced impedance transformer, the auxiliary test network topology when measuring the balance is in the following form, such as figure 1 , during the test, the two balanced ends of the balanced-unbalanced transmission line resistance converter are connected in series with a resistor R1, and then connected in parallel with the two resistors R2, the midpoint of the two voltage resistors is grounded, and the other end of the two voltage resistors is connected to the vector network analyzer or marker;

[0043] For the commonly used 1:1 balanced-unbalanced impedance converter, that is, when 1:N, 0 figure 2 , during the test, the two balanced ends of the balanced-unbalanced sensing line resistance converter are first connected i...

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Abstract

The invention relates to a method for measuring the balance degree of an impedance transformer. The method is used for correctly measuring the balance degree of a balance-imbalance impedance transformer and helping radio-frequency engineers to design and develop the impedance transformer with good balance degree. The method for measuring the balance degree of the impedance transformer is established based on an auxiliary test network, complete matching of impedances of test ports is achieved by the auxiliary test network, a network analyzer tests S parameters of an input port and all balance ports of the impedance transformer based on a vector network analyzer, and the balance degree of the impedance transformer is calculated through simple operation according to the S parameters. The method is simple in principle and high in operability.

Description

technical field [0001] The invention belongs to the technical field of communication, and more particularly refers to a structure and a determination method for measuring the balance degree of an impedance transformer and its network parameters by using a vector network analyzer. Background technique [0002] In the antenna system, it is necessary to transform the input impedance of the antenna to be equal to the characteristic impedance of the feeder to ensure that the feeder works in a traveling wave state. The potentials of the feed terminals are equal in size and opposite in phase, that is to say, the two arms of the vibrator are balanced to the ground. If this balance system is connected to the coaxial line that is unbalanced to the ground, the potential of the feed terminals of the vibrator The absolute values ​​are no longer the same. The balanced-unbalanced transmission line impedance converter realizes impedance transformation and balance transformation. If the ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/16G01R27/28
Inventor 马银圣何绍林聂贺峰金珠
Owner THE 22ND RES INST OF CHINA ELECTRONICS TECH GROUP CORP