| Radar sensors have the characteristics of strong anti-jamming ability,penetratable induction and non-contact induction,and are widely used in the fields of automatic driving,industrial control,traffic measurement and security detection.This paper is based on the X-band Doppler radar chip,the antenna design is designed to achieve radar sensors suitable for different application scenarios.The main research contents and innovation points are as follows:(1)For low-cost mass production X-band radar chips,the antenna solution is determined by considering factors such as product size,cost and stability,and the antenna design and processing test are completed.Based on the designed antenna,the radar sensor is realized,the influence of the circuit and device layout on the antenna is analyzed,and the antenna and radar sensor are optimized.The comprehensive performance of the radar sensor was finally tested.(2)X-band radar sensors for long-range applications study the feeding method of microstrip array antennas and the form of unequalamplitude feed arrays.A 4×10 Chebishev low sub-lobe array antenna was designed and processed.In order to solve the problem of narrow array antenna beam and limited detection range,a 1×16 series Taylor distribution low secondary lobe linear array is designed,and then 16 groups of linear arrays are used to form a 16x 16-unit one-dimensional phased array antenna,which has good scanning performance in the Hsurface ±50° range.(3)The X-band radar sensor for intelligent identification applications analyzes the principle and characteristics of the toroidal array OAM beam,and designs a dual-mode OAM ring array,which can generate+1 and+2 mode OAM beams with the same divergence angle through two independent ports.In order to overcome the problems of small OAM beam gain and high secondary lobe level generated by the circular array,the OAM beam generated by the two-dimensional plane phased array is analyzed,and it is verified that the two-dimensional plane phased array can generate multimodal vortex electromagnetic waves and can flexibly control the beam pointing of each mode. |
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