77GHz millimeter wave vehicle anti-collision radar antenna

Abstract

The invention belongs to the technical field of antennas, is suitable for vehicle-mounted millimeter-wave antennas, and is especially suitable for 77GHz millimeter-wave automotive anti-collision radars. On the radiation surface of the waveguide, the radiation slots are alternately arranged along the longitudinal axis of the waveguide. The electromagnetic wave enters the interior of the waveguide through the feeding port, propagates along the waveguide, and radiates uniformly through the radiation slots. Compared with most automotive radar antennas on the market, the invention has a simple structure and a small antenna volume, which is easy to install on various types of vehicles, does not generate temperature drift, and can withstand high-power electromagnetic waves, which can effectively improve the stability of the antenna system , Weaken the influence of weather environment on radar performance.

Description

technical field [0001] The invention relates to a single-ridge slotted waveguide antenna, which belongs to the technical field of antennas, and is suitable for vehicle-mounted (or other mobile carriers) millimeter-wave antennas, especially for 77GHz millimeter-wave automobile anti-collision radars. Background technique [0002] With the development of the economy, the total number of automobiles in my country has reached a relatively high level. By the end of 2016, it was close to 200 million vehicles, and the ownership rate per thousand people has exceeded 110. However, the rapid increase in the number of automobiles has led to frequent traffic accidents and huge human and economic losses; and automobile anti-collision radar has a significant effect on reducing the incidence of traffic accidents. Reduced by 51%, the average reduction in traffic accidents caused by changing lanes by 47%, the related technology was rated as one of the "Ten Focused Automobile Safety Technologi...

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Problems solved by technology

The patent No. CN200810120604.4 "millimeter-wave quasi-optical integrated dielectric lens antenna and its array" also uses this scheme to design anti-vibration and dust-proof, suitable for airborne and ship-borne millimeter-wave radar antenna structures. The radar consists of Microstrip integrated antenna, dielectric lens, objective lens, array base, reflector, protective cover, beam switching switch, etc., but the efficiency of the antenna is relatively low

The National Key Laboratory of Millimeter Waves of Southeast University announced a vehicle antenna for microwave and millimeter wave frequency bands in the patent CN201383548. Metallized through-hole array on one side realizes the sealing of electromagnetic waves, and realizes effective leaky wave radiation on the opening surface; this kind of antenna implementation scheme is difficult to achieve large transmission power, and it is difficult to realize the metallized through-hole array

[0004] At present, the automotive radar antennas based on the 77GHz frequency band mostly use the "patch antenna array" scheme, the "lens antenna" scheme and the "substrate integrated waveguide" scheme. The radiation efficiency of the "patch antenna array" scheme is too low to be practical. Although the structure of the "antenna" scheme is simple, the microwave lens can also reflect and absorb electromagnetic waves, and the antenna efficiency is relatively low; the "substrate-integrated waveguide" antenna scheme has high efficiency, but the electromagnetic characteristics of the waveguide internal dielectric material are easily absorbed by the outside world. The influence of temperature, that is, the problem of "temperature drift", and the antenna is not suitable for high-power electromagnetic waves

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