Microstrip series-fed array antenna, antenna area array and radio frequency front end of radar sensor

Abstract

The invention relates to a microstrip series-fed array antenna, an antenna area array and a radio frequency front end of a radar sensor. The microstrip series-fed array antenna comprises a dielectricsubstrate, a microstrip structure formed by metal foil on the upper surface of the dielectric substrate and a ground formed by the metal foil on the lower surface of the dielectric substrate, whereinthe microstrip structure includes a plurality of microstrip antenna main radiation units, a plurality of matching branch units and a microstrip main feeder, and the plurality of microstrip antenna main radiation units form a horizontal-line-shaped array; the plurality of matching branch units are respectively arranged at the input ends of the plurality of microstrip antenna main radiation units and are arranged in a mode of being matched with the plurality of microstrip antenna main radiation units; and the plurality of microstrip antenna main radiation units and the plurality of matching branch units are connected through the microstrip main feeder. Both the antenna area array and the radio frequency front end of the radar sensor adopt the microstrip series-fed array antenna. The microstrip series-fed array antenna has the advantages of wide application range, ability of realizing the main beam pointing normal direction, ability of obtaining broadband impedance characteristics and thelike.

Description

technical field [0001] The invention mainly relates to the technical field of antennas, in particular to a microstrip series-fed array antenna, an antenna array and a radio frequency front end of a radar sensor. Background technique [0002] The microstrip antenna is an antenna formed by attaching a conductive sheet to a dielectric substrate with a conductive ground plane. It has the characteristics of small size, light weight, and easy integration. It can also be mass-produced through advanced printed circuit board technology. Very low cost. Due to the above advantages, microstrip antennas are widely used in the field of automotive radar. [0003] Vehicle-mounted radar systems usually require antennas such as antenna gain, sidelobe level, and specific beam shape. A single antenna has low gain and wide beam, so it is difficult to meet this requirement. Generally, microstrip arrays are used to achieve these indicators. [0004] The forms of microstrip array antenna mainly i...

AI Technical Summary

Problems solved by technology

[0006] The first method refers to the document "Synthesis method of series-fed microstrip antennaarrays", which controls the radiation power of the array element by changing the width of the microstrip patch array element. However, this method has limitations in the design of traveling wave arrays. It requires The array element spacing deviates from the medium wavelength to meet the traveling wave condition, causing the pattern beam to deviate from the normal direction

[0007] The second method

Images