Multi-view-field array antenna for millimeter wave automobile radar

Abstract

The invention discloses a multi-view-field array antenna for a millimeter wave automobile radar, which is composed of three layers of dielectric materials and four layers of metals. The metal layers comprise a radiation layer, an antenna reflection layer, a strip line feed layer and a bottom floor layer. An array formed by four or more combined antennas is etched on the radiation layer, and the antennas are formed by radiation units in two forms of grid units and patch units. The antennas are symmetrical about the center line of the array, each antenna is composed of more than two identical grid radiation units which are arranged at equal intervals, the non-radiation edge of each grid unit is a bent arc instead of a traditional straight line, and the radiation edge of each grid unit is a gradient microstrip line instead of a traditional microstrip line with the same width. The patch units are added in the blank areas among the grid units, and the patch units and the inter-unit connecting sections form a series patch antenna, so that the area of the antenna is effectively utilized. The beam forming design is carried out on the array, so that a directional diagram has a plurality of square shoulder-shaped features, and different view fields divided by square shoulders meet the detection requirements of the radar on targets in different distance ranges. The structure is simple, integration of multiple detection distance functions of the radar can be realized only through one emission link, the processing difficulty of front-end signals is reduced, and the antenna is suitable for millimeter wave band automobile radars.

Description

technical field [0001] The patent of the present invention relates to wireless communication equipment, in particular to a vehicle-mounted radar antenna, specifically a multi-field array antenna for millimeter-wave vehicle radar designed by planar technology. Background technique [0002] With the development of smart cars and driverless technology, automotive radar is increasingly becoming an indispensable part of the car. Compared with ultrasonic, infrared, and laser system radars, millimeter wave automotive radar has the characteristics of large bandwidth, high resolution, small size, low cost, and can work in any harsh weather environment. At present, in the millimeter-wave automotive radar, in order to realize the detection and early warning of targets in different ranges, more than one transmitting array antenna is generally required. For example, in order to detect long-distance large targets, the array size needs to be large enough to achieve high-gain narrow beams;...

AI Technical Summary

Problems solved by technology

Multiple transmit arrays activate the working status by time-sharing through the front-end RF chips. On the one hand, there is a demand for the number of chip links, resulting in redundancy of transceiver link resources.

On the other hand, it also increases the difficulty of front-end signal processing

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