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Coaxial water load for medium-and-large-power calorimeter

A calorimeter and high-power technology, applied in the field of coaxial water load, can solve the problems of low measurement power measurement uncertainty, low heat absorption efficiency, narrow frequency range, etc., to expand the power measurement frequency band and reduce heat Dissipation, the effect of reducing the mismatch error

Active Publication Date: 2018-06-01
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology

However, due to the limitation of the electromagnetic characteristics of the rectangular waveguide, the frequency range of this type of water load is narrow, the heat absorption efficiency is not high, and there is a low measurement uncertainty for measuring power.

Method used

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  • Coaxial water load for medium-and-large-power calorimeter

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Embodiment 1

[0031] The invention discloses a coaxial water load structure of a medium and large power calorimeter, which is composed of four parts: a joint, a matching converter, a heat-insulated transmission line and a load structure, such as figure 1 shown. The joint is connected to the load structure through a heat-insulated transmission line and a matching transformer; wherein the joint is used to receive and transmit microwave signals; the heat-insulated transmission line is used to isolate the heat inside and outside the load structure, and receive the microwave signal transmitted by the joint , and transmit it to the matching converter; the matching converter is used to convert the impedance, reduce the microwave loss, and receive the microwave signal transmitted by the heat-insulated transmission line, and transmit it to the load structure; the load structure is used to receive the matching The microwave signal transmitted by the converter measures the microwave power.

[0032] ...

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Abstract

The invention provides a coaxial water load for a medium-and-large-power calorimeter. The coaxial water load comprises a joint, a matching transformer, a thermal insulated transmission line, and a load structure. The joint is connected with the load structure through the thermal insulated transmission line and the matching transformer. Such structure extends the power measurement frequency range and improves the power measurement accuracy. With the design idea of the present invention, the power of kilowatts within 4 GHz can be accurately measured. The coaxial water load uses an N-type joint.To increase power capacity and a heat dissipation effect, the actual size of the water load is much larger than the diameter of the N-type coaxial line internal conductor. To reduce the reflection coefficient of the load and to improve the accuracy of the power measurement, the water load is required to have a low reflection coefficient, no high-order mode operation at high frequencies, high repeatability after repeated screwing operations, and high mechanical strength.

Description

technical field [0001] The invention relates to the technical field of water load. More specifically, it relates to a coaxial water load for medium and high power calorimeters. Background technique [0002] In the field of power measurement, the main function of the load is impedance matching and power absorption. The power absorbed by the load causes its own temperature to change. People use this feature to design the structure of the calorimeter, which can determine the power absorbed by the load by measuring the temperature change of the load. According to the heat absorption mode of the load, it is divided into two types: water load and dry load. [0003] Water load is a load structure designed using water circulation as a heat sink. It has the characteristics of fast heat absorption and small size. It mainly exists in the form of a rectangular waveguide and is used as a medium-to-high-power absorption load. However, due to the limitation of the electromagnetic charac...

Claims

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Application Information

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IPC IPC(8): H01P1/26G01K17/00
CPCG01K17/00H01P1/262
Inventor 刘挺杨绪军
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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