Read more from Author Rachel Maga here:

5G is said to be more difficult to expand the area than 4G. In particular, high frequency bands such as the 28 GHz band called “millimeter wave” have high straightness (that is, the property of wrapping around behind obstacles is weak), making them unsuitable for construction of large areas.

This is because the higher the frequency of radio waves, the closer the nature is to light (visible light), but KDDI delivers 5G millimeter waves to the back of obstacles such as buildings by “reflection” in a specific direction. “Meta-surface reflector” has been developed.

This “transparent meta-surface reflector” is different from general specular reflection, and can reflect radio waves in the designed direction, which is different from the specular direction. In addition, by applying multi-layer technology, it supports dual bands in the 28 GHz band and the 39 GHz band, which is expected to be allocated to 5G in Japan.

The development was carried out jointly by KDDI R & D Laboratories and Nippon Electric Works Co., Ltd., and the scenery was taken into consideration by making it transparent. By overlaying it on signboards, etc., it is possible to quickly expand the millimeter-wave area in urban areas.

KDDI R & D Laboratories will exhibit the results at the 2020 International Symposium on Antennas and Propagation, which will be held online from January 25 to 28.

In order to realize high-speed and large-capacity that is considered to be innovative in 5G, it is essential to expand the millimeter-wave area that can secure a vast band, and the “transparent meta-surface reflector” is the 5G millimeter-wave area that remains in the current spot. It will be a new technology that supports the expansion of.


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