What is millimeter wave radar?

The electromagnetic wave with a wavelength of 1 to 10 mm is often called millimeter wave (millimeter wave), which is located in the wavelength range of microwave and far infrared wave overlapping, and has the following four characteristics:

Extremely wide bandwidth: millimeter wave frequency range is generally considered to be 26.5 ~ 300GHz, bandwidth up to 273.5GHz. More than 10 times the total bandwidth from DC to microwave. Even considering atmospheric absorption, only four main Windows can be used when propagating in the atmosphere, but the total bandwidth of these four Windows can reach 135GHz, which is 5 times the sum of the bandwidths of the bands below microwave. This is undoubtedly very attractive in today's frequency resources are tight.

Narrow beam: millimeter wave beams are much narrower than microwave beams at the same antenna size. For example, a 12cm antenna has a beamwidth of 18 degrees at 9.4GHz, and a wave speed width of only 1.8 degrees at 94GHz. This makes it possible to distinguish smaller targets that are closer together or to see the details of the target more clearly.

Compared to lasers: millimeter wave propagation is much less affected by climate and can be considered all-weather.

Compared to microwave: millimeter wave components are much smaller in size. Millimeter wave systems are therefore easier to miniaturize.

Compared with millimeter wave radar, millimeter wave radar has the characteristics of small size, easy integration and high spatial resolution. Early used in the military field, with the development and progress of radar technology, millimeter wave radar sensors began to be used in automotive electronics, unmanned aerial vehicles, intelligent transportation and other fields. In-vehicle mmwave radars operate in the 24GHz and 77GHz bands, with a few countries (such as Japan) using the 60GHz band.