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A self-intermodulation suppression method for transmission passive intermodulation test

A technology of intermodulation suppression and passive intermodulation, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of unable to transmit PIM calibration of components such as antennas, high requirements for low intermodulation loads, etc.

Active Publication Date: 2017-05-10
CHINA ELECTRONIS TECH INSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only calibrate reflection PIM, and has high requirements for low intermodulation loads, and cannot calibrate transmission PIM tests of components such as antennas

Method used

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  • A self-intermodulation suppression method for transmission passive intermodulation test
  • A self-intermodulation suppression method for transmission passive intermodulation test
  • A self-intermodulation suppression method for transmission passive intermodulation test

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Embodiment 1

[0044]The present invention is based on a vector measurement method for passive intermodulation (PIM) testing, that is, the phase of a PIM product is measured through a PIM reference channel, and a method for suppressing the transmission of a test system from transmitting its own PIM is provided for the transmission PIM test of components such as an antenna, And provide a new way to suppress reflective own PIM.

[0045] The principle of passive intermodulation testing is generally divided into two working modes, reflection and transmission. The purpose of the reflective test is the PIM interference generated by the tester components in the opposite direction to the multi-tone signal. Generally, connectors and cables are often used to measure their linearity; the purpose of the transmission test is the PIM interference generated by the tester components and the multi-tone signal. For PIM interference in the same direction, antennas often use this index to measure their linearit...

Embodiment 2

[0074] On the basis of the above embodiments, further, a self-intermodulation suppression method for transmission passive intermodulation testing, which includes the following steps:

[0075] Step 1: The signal sources f1 and f2 are amplified and combined to form a two-tone signal, which is loaded into the antenna feeder system in the microwave anechoic chamber through the Tx channel of the first duplexer, and the reflected PIM generated R Send it to the receiver through the Rx channel for reception; use another antenna horn to receive the transmission signal of the antenna feeder system, and transmit the dual-tone signal to be absorbed by the load through the Tx channel of the second duplexer, and transmit PIM T Enter the receiver through the Rx channel of the duplexer;

[0076] Step 2: Suppose the received transmitted PIM signal can be expressed as PIM TM , which reflects the PIM T And the vector synthesis of the system's own PIM, the received transmission PIM signal can b...

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Abstract

The invention provides a self intermodulation inhibition method for a transmission passive intermodulation (PIM) test. A phase position of a PIM product is measured through a PIM reference channel, and in allusion to the transmission PIM test of appliance parts such as antennae, a method for inhibiting transmission self PIM of a test system is provided and a novel method for inhibiting reflection self PIM can be provided. By means of the scheme, reflection self intermodulation and system transmission self intermodulation can be inhibited, thereby, excessive demands for intermodulation features of loads are not required, meanwhile, interference of transmission PIM and reflection PIM can be measured, and the dynamic range and the measurement uncertainty of the transmission PIM test of the system can be improved.

Description

technical field [0001] The invention belongs to the technical field of passive intermodulation testing, and in particular relates to a self-intermodulation suppression method for transmission passive intermodulation testing. Background technique [0002] In the application of modern communication systems, the interference of passive intermodulation (PIM) products caused by the nonlinearity of passive components to the system is more prominent, and the requirements for the linear characteristics of passive components such as antennas, connectors, and cables are getting higher and higher. Therefore, the PIM test system has developed rapidly in recent years. At present, the main test methods of PIM products include reflection and transmission. The purpose of reflection test is the PIM interference generated by the tester components in the opposite direction to the multi-tone signal. Generally, connectors and cables are often measured by this index. Linearity; transmission The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 杨保国年夫顺王尊峰梁胜利李树彪
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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