Impedance adjuster for multi-parameter measurement of microwave network in the state of microwave large signal

Abstract

The invention belongs to the technical field of testing, and relates to an impedance adjuster used for multi-parameter measurement of a microwave network under a microwave large signal state. The whole machine of the impedance adjuster consists of a microwave main body, a control unit, a display unit, a key, a drive unit, a photoelectric detection feedback unit, an external control computer, a standard external control interface and a precision The mechanical transmission part is composed. According to the principle of adjusting impedance in parallel, the impedance adjuster is connected in parallel to the flat coaxial transmission line through the admittance slider. The automatic control based on the high-performance microprocessor cooperates with the precision stepping motor and the precision mechanical transmission device, which can accurately realize the The displacement control of the admittance slider completes precise and small controlled displacement in the horizontal and vertical directions, and realizes precise impedance adjustment with a maximum reflection coefficient modulus of 0.875 and a repeatability better than 40dB.

Description

technical field [0001] The invention belongs to the technical field of testing, and relates to an impedance adjuster used for multi-parameter measurement of a microwave network in the state of a large microwave signal. Background technique [0002] The characteristic definition and testing of microwave networks (including microwave devices, components, transmission lines, etc.) can often be approximated as linear problems in general small-signal applications. The small-signal S-parameters (ie, scattering parameters) of the "black box" theory in the frequency domain or based on Satisfactory results can be obtained through the characterization and measurement of parameter derivation by this method; however, in the large signal state, the characteristic definition and test problems of the microwave network cannot be handled with approximate linearization, and it is necessary to accurately characterize and measure the performance under the actual working state Characteristic par...

AI Technical Summary

Problems solved by technology

In this test method, because it relies on the probe sliding along the slotted section to detect the electric field distribution in the line body to measure the voltage standing wave ratio, and the sliding transmission mechanism causes irregular changes in the probe coupling, the slotted measurement The measurement error caused by the residual reflection of the line, the unsteady loading of the probe, and the non-linearity of detection and indication are the constraints of inherent defects, which limit the measurement accuracy

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