Microwave bands include decimeter wave, centimeter wave, mmWave, and submmWave. Among them, mmWaves usually refer to electromagnetic waves with a frequency band of 30 to 300 GHz and a corresponding wavelength of 1 to 10 mm. Its operating frequency is between microwave and far-infrared waves, so it has the characteristics of both spectrums. The theory and technology of mmWave are the extension of microwave to high frequency and the development of light wave to low frequency. Potential applications of the mmWave include mmWave imaging, sub-terahertz chemical detectors, and applications in astronomy, chemistry, physics, medicine, and security.
1. Automotive radar. A very important application in imaging is automotive radar operating at 24GHz and 77GHz. Right now, only those very luxury cars are equipped with millimeter-wave radar technology. The technology can help the car drive in low visibility conditions, especially foggy weather. It can also be applied to automatic cruise control and autonomous driving on highways of the future.
2. mmWave imaging for medical applications. Another potential application of mmWave technology is passive mmWave imaging. Just by detecting the thermal radiation of the object in the mmWave band, the image of the object can be presented like an optical system. Either a set of receivers or a mobile terminal antenna is required to constantly scan the area of interest.
3. Wireless transmission of high-definition video. Consumer electronics manufacturers such as NEC, Samsung, Panasonic, and LG jointly established the WirelessHD Alliance to promote the application of 60GHz technology in uncompressed high-definition video transmission.
4. Application in electronic countermeasures. Military needs are an important factor driving the development of mmWave systems. At present, mmWaves have been widely used in radar, guidance, tactical and strategic communications, electronic countermeasures, remote sensing, radiation measurement, etc. Among them, strategic communication and electronic countermeasures are very important application directions.
Electronic countermeasures require communication equipment to have strong anti-jamming capabilities, and mmWaves have obvious advantages in this regard. For example, choosing the ship-to-ship millimeter-wave communication in the three "attenuation peak" frequency bands of 60GHz, 120GHz, and 200GHz can greatly improve the anti-jamming and anti-jamming capabilities of ship-to-ship communication by using the characteristics of severe signal attenuation in these frequency bands. interception capability.
In a word, the application of mmWave communication in the military is very necessary and significant, and it is a promising means of communication. It has the characteristics of a narrow beam, high data rate, concealment of radio waves, good confidentiality, anti-interference performance, rapid opening, convenient and flexible use, and all-weather work.