[China Instrument Network Instrument R&D] A few days ago, the 110 GHz to 170 GHz band millimeter-wave power reference developed by the China Institute of Metrology (“China Institute of Metrologyâ€) was officially approved by the National Institute of Standards and Technology (NIST) experts. This device, independently developed and manufactured by the Chinese, will serve as the highest basis for U.S. unification of the power level of this band, providing traceability services for U.S. users in the fields of wireless communications, electronics, and instrument manufacturing.
NIST experts test benchmark devices and related equipment developed by China Metrology Institute in the laboratory
Millimeter wave power is not traceable, NIST finds China Institute of Metrology
In early 2016, a well-known US electronic test and test instrument company found the National Institute of Metrology (NIST), and hoped to provide power calibration for its newly developed power sensor to increase the company's newly developed millimeter wave and too Reliability of product specifications such as Hertz power meters, signal generators, network analyzers, etc. However, the United States did not have calibration and measurement capabilities for millimeter-wave power in the band above 110 GHz.
In July 2016, Cui Xiaohai, director of the Microwave Room of China Institute of Metrology and Information Technology, reported on the latest self-developed millimeter-wave power benchmarks from China Institute of Metrology during the CPEM. “U.S. counterparts immediately contacted us to learn more about our technical ideas and implementation plan.†Cui Xiaohai said, “Our device breaks through the technical bottleneck of power measurement above 110 GHz, with wide frequency band, flat response curve, and thermoelectric conversion speed. Fast, high measurement accuracy, has aroused the strong response of the peers."
The superiority of technical indicators is reflected not only on paper. Since September last year, NIST-related laboratories have conducted extensive research on standard installations established by various countries. After repeated comparisons and field visits, NIST finally decided to purchase the WR-6 power reference and related equipment developed by the China Metrology Institute. In October of this year, power reference replicas and associated sensors and power meters developed exclusively for NIST passed the acceptance inspection in the United States and have now been delivered to NIST laboratories.
Aim at the forefront and overcome problems
Millimeter waves are electromagnetic waves in the frequency range of 30GHz to 300GHz. They are widely used in wireless communications, radar, remote sensing, radioastronomy and clinical medicine. In the whole life cycle of millimeter wave technology product development, application, maintenance, etc., power measurement is an "irreplaceable" technical measure, and accuracy of power measurement is crucial in many fields.
According to Cui Xiaohai, in the field of space applications, accurate power measurement can ensure the power margin of inter-satellite communication, and provide basis for reducing the diameter of the antenna and reducing the launch cost. In the field of communications, the power index affects the deployment of mobile communication base stations and terminal equipment. The consumption setting and accurate power measurement can save a lot of energy consumption and ensure the communication system is green, safe and reliable.
With the rapid increase in demand for millimeter-wave systems, millimeter-wave technology continues to extend toward the high frequency band of microwaves, which brings new challenges to millimeter-wave parameter measurement.
"Beyond 110 GHz, general commercial power sensors fail to meet the power stan- dard specifications. Therefore, in order to establish millimeter-wave power in the WR-6 band, power sensors must be developed to address their wideband high-matching, fast thermo-electric conversion and DC Clear traceability of power," said Cui Xiaohai.
Since 2014, under the support of the project of the National Science and Technology Support Program “Research on Wireless Communication Power Measurement Standards and Traceability Technology†by the China Measure Institute for Millimeter Wave and Terahertz Power Measurement, the National Microwave and Millimeter Wave Power Reference Devices have been launched. Performance improvement and comprehensive optimization study. After three years of hard work, the research team successfully overcomes technical bottlenecks in power calibrators, microcalorimeters, and calibration of standard instruments, and solves the problems of wideband high-matching, rapid thermoelectric conversion, accurate calorimetry, and correlation of magnitude to DC power. Problems, set up six sets of national microwave and millimeter wave power reference device, frequency coverage of 18GHz ~ 170GHz, further improve China's national microwave and millimeter wave power measurement reference system.
Among them, the 110 GHz-170 GHz power reference device developed by the research group is the first in the world and has completely independent intellectual property rights. The terahertz power absorption rate in the whole frequency band is as high as 99% or more. It has a wide operating frequency band, flat response curve, and fast thermoelectric conversion speed. , Measurement accuracy and so on. The replica of the device has been delivered to the National Institute of Metrology, NIST. It is understood that the task force has also won the international procurement bids of Singapore National Institute of Metrology and Hong Kong Regional Calibration Laboratory, and will establish N-type power standards for the two organizations.
12 Years of Technology Accumulation Lead to International Leading Level
In the field of metrology, microwave and millimeter-wave power are "critical parameters" defined by the International Bureau of Weights and Measures (BIPM) and are the most basic parameters in radio metrology. The power parameters are also the source of traceability of antenna, field strength, scattering, and other key parameters. For a long time, due to the lack of domestic core technologies and technological embargoes and equipment embargoes from developed countries, China's national microwave and millimeter-wave power benchmarks have many important frequency bands.
To this end, China Metrology Institute has worked hard for 12 years to continuously learn to study, optimize and improve power metering technologies, and established multiple microwave and millimeter-wave power reference devices for multiple bands in China from nowhere. The frequency coverage is from 10 MHz to 170 GHz. Measurement uncertainty Degree of 0.20% to 3.5% (k=2), reaching the international leading level. In the international comparison organized by BIPM, the power benchmark developed by the China Metrology Institute has repeatedly stood out in similar devices of measurement institutes in the United States, Germany, and Britain, and has received favorable comments from international counterparts. The calibration and measurement capabilities (CMC) of the relevant devices have all entered the BIPM Critical Database (KCDB) and have become internationally recognized national calibration and measurement capabilities.
(Original Title: US WR-6 Band Millimeter Wave Power Reference - Made in China!)
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