An array antenna for automotive radar sensor

Abstract

The invention discloses an array antenna for an automobile radar sensor, and the array antenna comprises a millimeter wave receiving and transmitting chip bonding pad, a first receiving linear antennaarray, a second receiving linear antenna array, a third receiving linear antenna array, a fourth receiving linear antenna array, a first transmitting linear antenna array, a second transmitting linear antenna array, and a third transmitting linear antenna array. The core architecture of the array antenna adopts a three-transmitting four-receiving antenna array mode, and adopts ten in-phase non-equal amplitude angle feed array elements as a basic unit structure to control the size and position of an antenna parasitic unit, reasonably suppress the sidelobe level of the antenna and optimize theradiation characteristics of the antenna. The impedance matching characteristic is improved by combining a combination method of tangential circular polarization and surface slotting of a symmetricalstructure . According to the scheme, high precision, high response speed and high resolution can be achieved, and a millimeter wave radar system scheme for medium-distance and long-distance detectioncan be achieved.

Description

technical field [0001] The invention relates to the technical field of vehicle-mounted millimeter-wave radar antennas, in particular to an array antenna for vehicle radar sensors. Background technique [0002] In recent years, automotive millimeter-wave radar technology has been developing rapidly as an advanced driver assistance system technology necessary for breakthrough future driverless technology. Compared with optical cameras and laser radars, vehicle-mounted millimeter-wave radars have all-weather detection capabilities that are not afraid of rain, fog, dust and haze, and have a long detection distance. At the same time, they have the advantages of high resolution and small size. Vehicle-mounted radars are divided into three main types according to distance: long-range, medium-range and short-range. Long-range radars usually use high-gain antennas to achieve long-distance detection requirements, but their field of view (FOV) is also rapidly decreasing, so they usual...

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Problems solved by technology

[0003] At present, the existing automotive millimeter-wave radar structure on the market mainly adopts the traditional microstrip line series-fed structure or series-fed array structure, the radiation characteristics of the antenna are difficult to control, and the processing consistency is poor; the suppression of the sidelobe level needs to be improved , the angular resolution ability is poor; the single TX-RX reflection path has the interference factor of target echo amplitude fluctuation, which cannot meet the index requirements of the millimeter-wave radar system scheme for medium-range and long-range detection

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