Frequency scanning antenna based on dispersive medium, control method and application

Abstract

The invention belongs to the technical field of antennas, and discloses a frequency scanning antenna based on a dispersion medium, a control method and an application thereof, including a dispersion wedge medium block and a feed array. Dispersion wedge media blocks are covered on the feed array and spaced apart. The present invention utilizes the superposition of the dispersion phase shift generated by the dispersion wedge medium block and the basic phase shift generated by the slope to form a phase difference that varies with frequency. When the phase difference is added to the adjacent elements of the conventional uniform feed array, the beam can be scanned with frequency. When the phase difference is added to the traditional frequency scanning antenna, the widening of the scanning angle can be realized. Furthermore, the dispersive medium can also extend the scanning range corresponding to the frequency band on the side of the center frequency point of the traditional frequency-sweeping antenna to beyond the normal line, and the standing wave at the zero-crossing point of the beam will not increase, which solves the problem of the standing wave at the zero-crossing point of the traditional frequency-sweeping antenna The problem of sudden rise improves the overall aperture utilization efficiency of the antenna system within the frequency scanning range.

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. Background technique [0002] At present: In the field of military communications, airborne and shipborne early warning radars need to constantly change the beam direction when searching for targets. Early radar antennas rely on continuous mechanical rotation to achieve beam scanning, which cannot meet the requirements of fast scanning, so mechanical scanning radar gradually withdraws from application. Electronically scanned antenna technology began to be used in airborne radar. Typical electronically swept antennas include phase sweep and frequency sweep. The frequency sweep antenna has the advantages of lower cost, simple structure, and simple feeding, and beam scanning can be achieved only by changing the feeding frequency. [0003] The disadvantage of the traditional...

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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