Advantages and disadvantages of millimeter wave

　　Millimeter wave: Electromagnetic waves with a wavelength of 1-10 millimeters are called millimeter waves, which are located in the wavelength range where microwaves and far-infrared waves overlap, and therefore have the characteristics of both spectra. The millimeter wave frequency band is not precisely defined, and electromagnetic waves in the frequency range of 26.5~300GHz are usually referred to as millimeter waves. The theory and technology of millimeter waves are respectively the extension of microwaves to high frequencies and the development of light waves to low frequencies.

　　advantage:

　　1) Extremely wide bandwidth. It is generally believed that the frequency range of millimeter wave is 26.5-300GHz, with a bandwidth of up to 273.5GHz. More than 10 times the total bandwidth from DC to microwave. Even considering atmospheric absorption, it is still highly attractive in today's frequency resource scarcity.

　　2) Narrow beam. Under the same antenna size, the millimeter wave beam is much narrower than the microwave beam. Therefore, it is possible to distinguish small targets that are closer together or observe the details of the target more clearly.

　　3) Compared to lasers, the propagation of millimeter waves is much less affected by climate and can be considered to have all-weather characteristics.

　　4) Compared to microwaves, millimeter wave components are much smaller in size. Therefore, millimeter wave systems are easier to miniaturize.

　　Disadvantages:

　　1) The propagation attenuation in the atmosphere is severe.

　　2) The precision requirements for device processing are high.

　　The main disadvantage of millimeter wave radar is that it is affected by atmospheric attenuation and absorption, and currently its operating range is mostly limited to within 10 kilometers. In addition, compared with microwave radar, the mass production yield of components for millimeter wave radar is currently low. In addition, many devices require gold or silver coating in the millimeter wave frequency band, so the device cost is relatively high

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