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Research Highlights

Super-fast 5G with High-performing Filters

  • Writerkrissadmin
  • Date2021-03-30 09:32
  • Hits845

Super-fast 5G with High-performing Filters

- 5G frequency filter that can be used semi-permanently like stickers -

- AI-based optimized design to pass through desired frequencies only to improve 5G communication quality -


The Korea Research Institute of Standards and Science (KRISS, President Hyun-Min Park) successfully developed a 5G frequency filter that can improve 5G quality. The filter is expected to improve frequency interference between different carriers and boost the world’s top 5G quality.

 

▲ KRISS 5G convergence research team

(From left, Dal-Jae Yun (Senior research scientist at the Advanced Instrumentation Institute), In-June Hwang (Senior research scientist at the Division of Physical Metrology), In-Ho Lee (Principal research scientist at the Interdisciplinary Materials Measurement Institute), Young-Pyo Hong (Principal research scientist at the Division of Physical Metrology))

 

The 5G convergence research team of KRISS* designed an AI-based 5G frequency filter structure that offers the best performance for the 5G communications system. The filter has greater performance and is cheaper than commercially available products; therefore, it can be immediately applied in industrial fields.

 

  * KRISS Electromagnetic Wave Metrology Group (5G Plus Team), Interdisciplinary Materials Measurement Institute (Low-level Elemental Matter Research Team), Advanced Instrumentation Institute (Research Equippment Platform Team)

 

Launched in April 2019, the 5G service enables users to download a large volume of data at a high speed without spatial restrictions. A company has recently introduced the technology capable of downloading a movie with the file size of 4GB in about six seconds.

 

To improve the 5G quality, a high-performing filter to minimize frequency interference is necessary. To improve the communication performance of millimeter-wave 5G*, the core technology of 5G services, it is essential to seperately operate the available frequency band assigned to each carrier. An ideal filter would pass through all signals between specific frequencies and completely block signals in other frequency bands.

 

  * Millimeter-wave 5G: 5G technology that uses a much higher frequency band (e.g., 28GHz) than the traditional frequency band (3.5GHz). As the frequency bands used by three carriers in Korea (KT, LGU+, SKT) are closely located, a filter to divide the bands is necessary.

 

The communications equipment at 5G base stations that use massive MIMO* technology uses as many filteres as antennas. Commercially available products that occupy more than 80% of the market require the process of connecting and assembling between large volume (~1,000) of antennas and filters, which may result in quality differences between filters.

 

  * Massive MIMO: Technology to enhance the communication speed by placing hundreds of antennas on two-dimensional planes and connecting multiple users simultaneously.  


 

▲ Concept of 5G antenna (left) and 5G frequency filter (metasurface filter) designed based on AI tools

 

 

The KRISS convergence research team successfully developed a filter that has greater performance than commercially available products and offers consistent quality at a much cheaper price. The 5G frequency filter developed by the team is a type of thin-film as thin as 50μm (micrometer, one-millionth meter), 1/4 of the thickness of a business card. Unlike the foreign products that require the additional process of connecting the filter and antenna, the 5G filter is produced as a single-layer metal sheet that is flexible and can be attached and removed like a sticker.

 

- The filter performance was evaluated in the environment combined with a 5G antenna at the commercial level. The filter developed by KRISS demonstrated better performance than commercially available filters in terms of frequency band, loss characteristics, and characteristics of selecting frequencies.

 

The research team designed the filter with the optimized performance for the 5G system by applying the global optimization method independently developed based on AI tools. This is called a metal surface filter, which periodically arranges fine and complex unit structures on the two-dimensional plane and controls the characteristics of reflection, refraction or penetration of electromagnetic waves or light.

 

▲ KRISS convergence research team holds a thin film-type 5G frequency filter.

 


“The filter developed by the 5G convergence research team offers high performance, low price, and an innovative design method and has competitiveness to transform the market structure for 5G frequency filters,” said Dr. Hong. “This technology can also be used for 5G antenna beamforming technology and national defense stealth technology.”

 

The elemental technology developed for this research was published in IEEE Access, a renowned international communications journal, in February, and a patent for the design technology based on AI tools has been applied for.

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