Polarized reconfigurable circularly-polarized antenna with low radar cross section

Abstract

The invention proposes a polarized reconfigurable circularly-polarized antenna with a low radar cross section, and mainly solves the problems that a conventional reconfigurable antenna is complex in structure and is high in processing cost. The antenna comprises a multi-layer dielectric substrate. The lower surface of the first dielectric substrate is printed with a circular metal reflecting plate. A circular metal patch with a cross-shaped slit is printed on the upper surface of the second dielectric substrate, and an exponentially-shaped metal-coupling feed line is printed on the lower surface. Left and right rectangular metal patches are printed on the lower surface of the third dielectric substrate, and a circular metal surface is printed on the upper surface. The fourth dielectric substrate has a cross-shaped through groove. The first and second dielectric substrates are pasted as a lower layer structure, and the third and fourth dielectric substrates are pasted as an upper structure, the upper and lower layer structures are fixed by a central shaft and can rotate relative to each other to achieve reconfigurability. The antenna has the advantages of simple structure, low processing cost and high gain, can realize radar cross-section reduction, and can be used for a low radar cross-section scene in a wireless communication system.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic fields and microwaves, and in particular relates to a polarization reconfigurable circularly polarized antenna, which can be used in low radar cross-sectional area scenarios in wireless communication systems. Background technique [0002] Circularly polarized antennas are widely used in various wireless communication systems, such as global satellite navigation systems, radio frequency identification, etc. Circularly polarized antennas can effectively combat polarization mismatch and multipath interference. After the general antenna is designed, it completes the fixed function according to the design result. On some special communication equipment, it is necessary to install a variety of antennas with different functions to meet specific requirements, which makes the antenna on the communication equipment need to occupy more space. Space, the reconfigurable antenna can dynamically complete...

AI Technical Summary

Problems solved by technology

For example, liquid crystal or ferrite with adjustable magnetic field can realize antenna reconfiguration, but this method requires special materials, high production cost, and limited reconfigurability

[0007] Using some special mechanical structures, it can be reconfigured by changing the relative position of the feed line and the rectangular patch that has been chamfered. The gain is low, the working frequency band is narrow, and it does not have the function of reducing the radar cross section. Moreover, when the radar cross section reducing structure is added to the upper layer of the antenna, it will affect the radiation of the antenna and reduce the gain of the antenna. If the radar cross section reducing structure is placed around the antenna patch, This will increase the antenna floor, thereby increasing the radar cross section of the antenna, which is not conducive to the reduction of the antenna radar cross section

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