Dual-polarized microstrip antenna unit having wide-angle and broadband scanning capability

Abstract

The invention discloses a dual-polarized microstrip antenna unit suitable for wide-angle and broadband scanning, and belongs to the technical field of antenna engineering. The antenna is composed of alaminated patch layer, a dual-polarization feed layer and a metal bottom plate. The laminated patch layer comprises two layers of PCBs, and metal walls are used as supports. The feed layer comprisesa horizontally-polarized microstrip feed line, a cross-shaped coupling groove in the ground and a vertically-polarized asymmetric strip line feed which are arranged on the three layers of PCBs respectively. Through the metal walls and the metal bottom plate, the mechanical strength and stability of the antenna are improved; an air cavity supported by the metal walls increases the bandwidth of theantenna, avoids the use of a low-dielectric-constant PCB, and reduces the number of layers of the PCBs, thereby reducing alignment error in the assembly process and reducing the cost; and the feed layer avoids blind holes, thereby reducing processing difficulty, and reducing processing cost. Simulation and experiment results show that the antenna unit is used in a phased array, and can realize 15%of relative bandwidth; grating lobes and high sidelobes do not appear in + / -45 degrees of scanning in the bandwidth; the active standing wave is lower than 2.5; the cross polarization is lower than-20dB; and the isolation degree is more than 23dB.

Description

technical field [0001] The invention belongs to the technical field of antenna engineering, and relates to a dual-polarized microstrip antenna unit capable of realizing wide-angle and wide-band scanning. Background technique [0002] Dual-polarized antennas can double the spectrum utilization rate and are widely used in communication systems. In the field of radar detection and imaging, different polarizations can also obtain different imaging information of targets; microstrip antennas have the advantages of low profile, simple structure, and low processing cost. , but the bandwidth of common microstrip antenna is only 2% to 5%, which limits its application. In the paper "Wide-Band microstrip antenna with an H-shaped coupling aperture", the microstrip antenna bandwidth is increased using stacked patches; in the paper "Dual polarized wide-band aperture stacked patch antennas", a cross-shaped coupling slot is used And the Y-shaped feeder excites the laminated patch to realiz...

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Problems solved by technology

However, the antenna unit uses 8 layers of dielectric, and a large number of blind holes are used

Firstly, the processing and assembly errors are increased; secondly, a large number of blind holes and dielectric laminated structures increase the difficulty and cost of processing, and the antenna layer adopts RT / duroid 5880LZ material with low dielectric constant, which also increases the cost; again , the antenna lacks a metal skeleton, and the mechanical strength of the dielectric material is not enough

Finally, the paper does not give the active standing wave versus frequency curve of the antenna unit under different scan angles

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