Dispersive medium-based frequency scanning antenna, control method and application

Abstract

The invention belongs to the technical field of antennas, and discloses a dispersive medium-based frequency scanning antenna, a control method and application, and the frequency scanning antenna comprises a dispersive oblique splitting medium block and a feed array. The dispersion oblique splitting medium block covers the feed array, and intervals are reserved between the dispersion oblique splitting medium block and the feed array. Dispersion phase shift generated by the dispersion oblique splitting medium block and basic phase shift generated by the slope are superposed to form a phase difference changing along with frequency. When the phase difference is added to the adjacent units of the conventional uniform feed array, the scanning of the wave beam along with the frequency can be realized. When the phase difference is added to the traditional frequency scanning antenna, the scanning angle can be widened. Furthermore, the dispersive medium can extend the scanning range corresponding to the frequency band on one side of the center frequency point of the traditional frequency scanning antenna to cross the normal, and the standing wave of the wave beam at the zero crossing point does not rise, so that the problem that the standing wave of the traditional frequency scanning antenna suddenly rises at the zero crossing point is solved, and the overall aperture utilization efficiency of the antenna system in the frequency scanning range is improved.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a frequency scanning antenna based on a dispersion medium, a control method and an application thereof. Background technique [0002] At present: In the field of military communications, when airborne and shipborne early warning radars are searching for targets, they need to constantly change the beam direction. Early radar antennas relying on continuous mechanical rotation to achieve beam scanning cannot meet the requirements of fast scanning, so mechanical scanning radars are gradually withdrawn from application. Electric scanning antenna technology began to be used in airborne radar. Typical electric scanning antennas include phase scanning and frequency scanning. Frequency scanning antennas have the advantages of lower cost, simple structure, and simple feeding. The beam scanning can be realized only by changing the feeding frequency. [0003] The disadvantage ...

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of the traditional leaky wave frequency scanning antenna is that the scanning range is too small in a narrow frequency band, and there is a frequency point where the beam is directed to the normal direction of the plane where the antenna is located. The reflections generated by each radiation slot are superimposed in phase, resulting in standing waves the inherent defect of sudden elevation

Although people subsequently adopted the slow wave line to widen the scanning range, the above-mentioned inherent defects still cannot be solved, and the normal pointing beam has to be abandoned when using it, which brings a lot of inconvenience to practical applications

[0004] Through the above analysis, the problems and defects of the existing technology are: the scanning range of the traditional leaky-wave frequency scanning antenna is too small in a narrow frequency band, and there is a frequency point that makes the beam point to the normal direction of the plane where the antenna is located. The reflections from the radiating slits add up in phase, leading to the inherent defect that the standing wave rises abruptly

[0005] The difficulty of solving the above problems and defects is: passing through the serpentine slow wave line will cause the antenna size to increase; and corresponding to the state where the beam points to the normal direction, the inside of the feeder needs to excite the radiation slots in the same phase. At this time, each radiation unit is in the internal The reflections superimposed in the same phase will lead to the deterioration of the VSWR and the overall characteristics of the antenna at this frequency point

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