Application of Millimeter Wave

　　In the field of 5G:

　　The United States adopts millimeter wave frequency band; Countries such as Japan, South Korea, and Europe deploy both the Sub-6 GHz (frequency band below 6 GHz) and millimeter wave frequency bands together.

　　At present, the domestic 5G communication field mainly adopts the Sub-6 GHz frequency band. 2.6Ghz, 3.5Ghz, 4.9Ghz, etc. Because it is too difficult to use millimeter waves and many key components cannot be solved, China has no choice but to choose to use intermediate frequency. Given that Sub-6 GHz spectrum resources are very scarce in most countries (including China), the introduction of millimeter waves in China in the future is also a trend.

　　Other applications:

　　Millimeter wave imaging, sub THz chemical detectors, and applications in astronomy, chemistry, physics, medicine, and security. give an example:

　　1. Automotive radar

　　An important application in the field of imaging is automotive radar operating at 24GHz and 77GHz. This technology can assist car driving in low visibility conditions, as well as automatic cruise control and even autonomous driving on future highways.

　　2. Millimeter wave imaging for medical applications

　　Another potential application of millimeter wave technology is passive millimeter wave imaging. By detecting the thermal radiation of an object in the millimeter wave frequency band, the image of the object can be presented like an optical system. Either a set of receivers or a mobile terminal antenna is needed to continuously scan the area of interest. (Used in endocrinology, orthopedics, and pain management)

　　3. Wireless transmission of high-definition videos

　　4. Application in Electronic Warfare

　　The military needs are an important factor driving the development of millimeter wave systems, which have the characteristics of narrow beam, high data rate, radio wave concealment, good confidentiality and anti-interference performance, rapid deployment, convenient and flexible use, and all-weather operation. Currently, millimeter waves have been widely used in radar, guidance, warfare and strategic communication, electronic countermeasures, remote sensing, radiation measurement, and other fields. Among them, strategic communication and electronic countermeasures are very important application directions. In electronic warfare, communication equipment is required to have strong anti-interference capabilities, and millimeter waves have shown significant advantages in this regard. For example, selecting millimeter wave communication between ships in the three "attenuation peak" frequency bands of 60GHz, 120GHz, and 200GHz can greatly improve the anti-interference and anti interception capabilities of ship to ship communication by taking advantage of the severe signal attenuation characteristics in these frequency bands.

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