CN218513686U - Broadband high-gain circularly polarized horn antenna loaded with super-structured surface - Google Patents

Abstract

The utility model relates to a broadband high-gain circular polarization horn antenna with a loaded super-structured surface, which comprises a coaxial waveguide converter, a square wave guide port-to-circular waveguide port adapter, a linear polarization horn antenna and a two-layer super-structured surface, wherein the side surface of the coaxial waveguide converter is provided with a coaxial feed joint, and the coaxial waveguide converter is connected with the square wave guide port-to-circular waveguide port adapter and the linear polarization horn antenna through flanges; the two layers of the super-structure surfaces are an upper layer super-structure surface and a lower layer super-structure surface respectively, and the upper layer super-structure surface is formed by arranging a plurality of lines of circularly polarized units; the lower-layer super-structure surface is formed by arranging a plurality of phase compensation units. By loading the super-structure surface line circular polarization converter on the aperture surface of the traditional linear polarization conical horn and utilizing the phase compensation principle, the broadband high-gain circular polarization horn antenna is designed, and the problems of narrow frequency band, large size, heavy weight, difficulty in processing and the like of the traditional circular polarization horn antenna are solved.

Description

Broadband high-gain circularly polarized horn antenna loaded with super-structured surface

The technical field is as follows:

the utility model relates to a broadband high-gain circular polarization horn antenna on loading super structure surface.

The background art comprises the following steps:

in satellite communication systems, high efficiency, high gain transmit receive antennas are a prerequisite for their proper operation. As the most widely used form of antenna, the aperture antenna is typically much larger in size than the wavelength and is particularly suitable for forming high gain pencil beams in the microwave band. Circularly polarized antennas play an important role in many areas of wireless communication. Compared with a linear polarization antenna, the antenna can receive circularly polarized waves with the same rotating direction as the antenna, and can also receive linearly polarized waves and elliptically polarized waves. Compared with other circularly polarized antennas, the circularly polarized horn antenna has good directivity and wider working frequency band, and has very wide application in the fields of communication, navigation guidance and the like.

The circularly polarized horn antenna is realized by adding a circular polarizer to an output port of a common horn antenna, wherein the circular polarizer is a microwave component for forming space orthogonal electric field vectors with equal amplitude and 90-degree phase difference. The circular polarization of the conventional horn antenna is mainly formed by a circular polarizer, and a screw circular polarizer, a diaphragm circular polarizer, a dielectric plate circular polarizer and the like are commonly used. The horn antenna designed by using the circular polarizers has the defects of narrow frequency band, overlarge size, difficult processing, high cost and the like.

The design and optimization of an 8mm waveguide screw circular polarizer published by scholar et al in 2007 proposes a design of a circular polarized horn antenna formed by symmetrically inserting two rows of screws into a circular waveguide to form a screw circular polarizer. But the frequency band is narrow, the processing is not easy, and the cost is high.

The design, processing and test process of the partition plate type circular polarizer with the low axial ratio of the K wave band is provided by < the partition plate type polarizer with the low axial ratio of the K wave band > published by smithing et al in 2017. The antenna is designed with a cover plate type mechanical structure, obtains a very low axial ratio in a relatively wide frequency band range, and has good circular polarization performance. However, the complicated design method makes the antenna larger in volume and brings great trouble to processing.

In conclusion, in the current stage, the design of many circularly polarized horn antennas is complicated, the processing is extremely inconvenient, and the linear polarized horn antenna can not be reused.

The utility model has the following contents:

the utility model discloses make the improvement to the problem that above-mentioned prior art exists, promptly the utility model aims to solve the technical problem that a broadband high-gain circular polarization horn antenna on loading super structure surface is provided, reasonable in design, the size and the weight of the former linear polarization loudspeaker of unobvious increase, processing is convenient.

In order to realize the purpose, the utility model discloses a technical scheme be: a broadband high-gain circularly polarized horn antenna loaded with a super-structured surface comprises a coaxial waveguide converter, a square wave guide port-to-circular waveguide port adapter, a linearly polarized horn antenna and two layers of super-structured surfaces, wherein the coaxial waveguide converter, the square wave guide port-to-circular waveguide port adapter, the linearly polarized horn antenna and the two layers of super-structured surfaces are sequentially arranged from bottom to top; the two layers of the super-structure surfaces are distributed up and down and are arranged at the horn mouth diameter end of the linear polarization horn antenna, the two layers of the super-structure surfaces are an upper layer super-structure surface and a lower layer super-structure surface respectively, and the upper layer super-structure surface is formed by arranging a plurality of line-to-circular polarization units; the lower-layer superstructure surface is formed by arranging a plurality of phase compensation units.

Furthermore, a horn caliber end of the linearly polarized horn antenna is connected with a horn caliber extension fixing ring, the upper layer of the super-structure surface is fixed on the horn caliber extension fixing ring, and the upper layer of the super-structure surface is flush with the upper surface of the horn caliber extension fixing ring; the lower-layer super-structure surface is tightly attached to a horn mouth diameter surface of the linearly polarized horn antenna.

Furthermore, a gap is reserved between the upper layer of the superstructure surface and the lower layer of the superstructure surface, and the plurality of linear-to-circular polarization units are arranged in the same unit sequence; the phase compensation units are arranged according to the phase compensation distribution sequence.

Furthermore, the linear-to-circular polarization unit comprises an upper medium plate, a pair of metal strips are etched on the upper end surface and the lower end surface of the upper medium plate, the pair of metal strips on the upper end surface of the upper medium plate and the pair of metal strips on the lower end surface of the upper medium plate are orthogonally distributed, the pair of metal strips on the upper end surface of the upper medium plate are distributed in a left-right mode, and the pair of metal strips on the lower end surface of the upper medium plate are distributed in a front-back mode; z-shaped metal patches are etched in the middle of the upper end face and the lower end face of the upper dielectric plate, and the Z-shaped metal patches on the upper end face and the lower end face of the upper dielectric plate are distributed in a chiral symmetry mode.

Furthermore, the thickness of the upper dielectric plate is one tenth of the free space wavelength of the central frequency of the working band.

Furthermore, the phase compensation unit comprises a lower dielectric slab A and a lower dielectric slab B which are distributed up and down, metal gratings are etched on the upper end surface of the lower dielectric slab A and the lower end surface of the lower dielectric slab B, and the metal gratings on the upper end surface of the lower dielectric slab A and the metal gratings on the lower end surface of the lower dielectric slab B are distributed orthogonally; and a double-gap ring unit is etched between the lower dielectric plate A and the lower dielectric plate B.

Further, the double-notch ring unit comprises eight 3-bit phase correction super-structure surface units with the phase gradient difference of 45 degrees from-180 degrees to 180 degrees, and the deflection angles of the eight phase correction super-structure surface units are +/-45 degrees.

Further, the thickness of the lower dielectric slab a and the thickness of the lower dielectric slab B are both one sixteenth of the free space wavelength of the central frequency of the working frequency band.

Furthermore, the linearly polarized horn antenna is a conical linearly polarized horn antenna, and a large-end opening plane of the conical linearly polarized horn antenna is circular.

Compared with the prior art, the utility model discloses following effect has:

(1) The linear polarization horn antenna adopts the traditional conical horn antenna, the design process is simple, and the processing is convenient; moreover, the horn caliber extension fixing ring is designed, the super-structure surface can be conveniently assembled and can be repeatedly utilized, and different super-structure surfaces are loaded, so that horn antennas with different performances are designed;

(2) The super-structure surface has simple design, convenient processing and low manufacturing cost;

(3) Eight 3-bit phase correction super-structured surface units with 45 degrees as phase gradient difference from-180 degrees to 180 degrees are designed in the phase compensation unit, and can be used for the horn antenna to perform phase compensation, so that the circularly polarized horn antenna with high gain and low side lobe is realized, and the side lobe of the YOZ surface is basically lower than-26 dB; the designed circularly polarized horn antenna has a wider axial ratio bandwidth, and the problem of narrow bandwidth of the traditional circularly polarized horn antenna is solved; the designed circularly polarized horn antenna has higher gain;

(4) The design of the broadband high-gain circularly polarized horn antenna in the patent of the utility model has strong universality, and for the linearly polarized horn antenna with any frequency band and any shape, the transmitted linearly polarized wave can be converted into the circularly polarized wave as long as the linear-to-circularly polarized superstructure surface matched with the shape of the aperture surface of the linearly polarized horn antenna is loaded on the aperture surface or inside according to the parameter requirements; the linear-to-circular polarization super-structure surface antenna unit can also adopt units with any phase compensation precision to compensate the spherical phase wavefront.

Description of the drawings:

FIG. 1 is a schematic perspective view of an embodiment of the present invention;

FIG. 2 is a schematic view of the construction of the two-layer microstructured surface of FIG. 1;

FIG. 3 is a schematic perspective view of the linear-to-circular polarization unit and the phase compensation unit;

FIG. 4 is a front view construction schematic of FIG. 3;

FIG. 5 is a schematic diagram of a top view configuration of the linear-to-circular polarization unit;

FIG. 6 is a schematic diagram of the construction of a double-gapped ring unit in a phase compensation unit;

fig. 7 is a graph of eight 3-bit phase and transmission coefficients of a phase compensation unit;

FIG. 8 is a graph of eight phase axis ratios of 3 bits for a phase compensation unit;

fig. 9 is a phase compensation distribution diagram in the design process of the embodiment of the present invention;

FIG. 10 is a graph of the S11 parameter versus frequency at 11GHz-15GHz according to an embodiment of the present invention;

FIG. 11 is a graph of axial ratio versus frequency for the embodiment of the present invention at 11GHz-15 GHz;

FIG. 12 is a graph showing the variation of gain with frequency in 11GHz-15GHz

Fig. 13 is a XOZ plane normalized directional diagram at 12.5GHz according to an embodiment of the present invention;

fig. 14 is a normalized pattern diagram of the YOZ plane at 12.5GHz in accordance with an embodiment of the present invention.

In the figure:

1-a coaxial feed connection; 2-coaxial waveguide converters; 3-square wave guide port to round wave guide port adapter; 4-linearly polarized horn antenna; 5-a flange; 6-extending and fixing the caliber of the horn; 7-upper layer of the superstructure surface; 8-lower layer of the microstructured surface; 9-a metal strip; 10-Z type metal patches; 11-a metal grating; 12-double-notched ring patch; 13-upper dielectric plate; 14-lower dielectric slab a; 15-lower dielectric slab B; 16-line-to-circular polarization unit; 17-a phase compensation unit; 18-screw hole.

The specific implementation mode is as follows:

the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

As shown in fig. 1-6, the utility model relates to a broadband high-gain circular polarization horn antenna with loaded super-structure surface, including coaxial waveguide converter 2, square wave guide mouth to circle waveguide mouth adapter 3, linear polarization horn antenna 4 and the two-layer super-structure surface that set gradually from bottom to top, the side of coaxial waveguide converter 2 is provided with coaxial feed joint 1, and coaxial waveguide converter 2 and square wave guide mouth to circle waveguide mouth adapter 3 are connected together through flange 5, and coaxial feed line external feed joint 1 feeds the horn antenna; the square wave guide port-to-circular wave guide port adapter 3 is also connected with the linearly polarized horn antenna 4 through a flange 5 and is used for radiating electromagnetic waves; the two layers of the super-structure surfaces are distributed up and down and are arranged at the horn mouth diameter end of the linear polarization horn antenna 4, the two layers of the super-structure surfaces are an upper layer super-structure surface 7 and a lower layer super-structure surface 8 respectively, and the upper layer super-structure surface 7 is formed by arranging a plurality of linear-to-circular polarization units 16; the lower layer superstructure surface 8 is composed of a plurality of phase compensation units 17. According to the circularly polarized horn antenna, the metamaterial surface-line circularly polarized converter is loaded on the aperture surface of the traditional linearly polarized conical horn, and the broadband high-gain circularly polarized horn antenna is designed by utilizing the phase compensation principle, so that the problems of narrow frequency band, large size, heavy weight, difficulty in processing and the like of the traditional circularly polarized horn antenna are solved.

In this embodiment, a horn aperture extension fixing ring 6 is connected to a horn aperture end of the linearly polarized horn antenna 4, the upper layer of the super-structured surface 7 is fixed on the horn aperture extension fixing ring 6, and the upper layer of the super-structured surface 7 is flush with the upper surface of the horn aperture extension fixing ring 6; the lower-layer super-structure surface 8 is tightly attached to the horn mouth diameter surface of the linearly polarized horn antenna 4.

In this embodiment, a gap is left between the upper layer of the superstructure surface 7 and the lower layer of the superstructure surface 8, and the plurality of linear-to-circular polarization units are arranged in the same unit sequence; the phase compensation units are arranged according to the phase compensation distribution sequence. It should be noted that the linear-to-circular polarization unit and the phase compensation unit are both arrays that are periodically arranged according to the actual size of the horn aperture surface of the linearly polarized horn antenna.

In this embodiment, eight circumferentially and uniformly distributed screw holes 18 are designed at the edges of the upper layer super structure surface 7 and the lower layer super structure surface 8, so as to be mounted on the caliber end of the horn. In order to reduce the influence of metal on electromagnetic waves, a nylon screw is adopted as a screw for fixing the surface of the super structure. The linear-to-circular polarization unit comprises an upper-layer dielectric plate, a pair of metal strips are etched on the upper end face and the lower end face of the upper-layer dielectric plate, the pair of metal strips on the upper end face of the upper-layer dielectric plate and the pair of metal strips on the lower end face of the upper-layer dielectric plate are orthogonally distributed, the pair of metal strips on the upper end face of the upper-layer dielectric plate are distributed in a left-right mode, and the pair of metal strips on the lower end face of the upper-layer dielectric plate are distributed in a front-back mode; z-shaped metal patches are etched in the middle of the upper end face and the lower end face of the upper dielectric plate, and the Z-shaped metal patches on the upper end face and the lower end face of the upper dielectric plate are distributed in a chiral symmetry mode.

In this embodiment, the upper layer of the superstructure surface 7 is a line-to-circular polarization superstructure surface, as shown in fig. 3, the line-to-circular polarization unit constituting the upper layer of the superstructure surface 7 includes an upper layer dielectric plate 13 having a thickness of one tenth of a free space wavelength of a central frequency of a working band, a pair of metal strips 9 are etched on both upper and lower end surfaces of the upper layer dielectric plate 13, the pair of metal strips 9 on the upper end surface of the upper layer dielectric plate 13 and the pair of metal strips 9 on the lower end surface are orthogonally distributed, the pair of metal strips 9 on the upper end surface of the upper layer dielectric plate 13 are vertically distributed and distributed left and right, and the pair of metal strips 9 on the lower end surface of the upper layer dielectric plate 13 are horizontally distributed and front and back; z-shaped metal patches 10 are etched in the middle of the upper end face and the lower end face of the upper dielectric plate 13, and the Z-shaped metal patches 10 on the upper end face and the lower end face of the upper dielectric plate 13 are distributed in a chiral symmetry manner.

In this embodiment, the lower layer of the superstructure surface 8 is a superstructure surface with a phase compensation function, as shown in fig. 3, the phase compensation unit forming the lower layer of the superstructure surface 8 includes a lower layer dielectric slab a14 and a lower layer dielectric slab B15 which are distributed up and down, the lower layer dielectric slab a and the lower layer dielectric slab B are pressed together, the thicknesses of the lower layer dielectric slab a14 and the lower layer dielectric slab B15 are both one sixteenth of the free space wavelength of the central frequency of the operating band, the metal gratings 11 are etched on the upper end surface of the lower layer dielectric slab a14 and the lower end surface of the lower layer dielectric slab B15, and the metal gratings 11 on the upper end surface of the lower layer dielectric slab a14 and the metal gratings 11 on the lower end surface of the lower layer dielectric slab B15 are distributed orthogonally; a double-gap ring unit 12 is etched between the lower dielectric plate a14 and the lower dielectric plate B15. Eight phase correction ultrastructure surface units of 3bit phase taking 45 degrees as phase gradient difference from-180 degrees to 180 degrees are designed by changing the outer ring radius, the size of a square block and other dimensions and the notch deflection angle of the double-notch ring unit 12, so that the phase compensation requirement is met. Firstly, the size of a metal double-gap ring 12 of a certain four phase correction super-structure surface units is changed, a deflection angle of +45 degrees is kept unchanged, four phase correction super-structure surface units with phase gradient difference of 45 degrees from minus 180 degrees to minus 45 degrees are designed, then the deflection angles of the double-gap rings of the four phase correction super-structure surface units are adjusted to minus 45 degrees, so that another four phase correction super-structure surface units with phase difference of 180 degrees and phase gradient difference of 45 degrees from 0 degrees to 135 degrees are generated, and the design of the eight phase correction super-structure surface units is completed.

In this embodiment, the loaded phase compensation metamaterial surface unit is not limited to the 3-bit design, and a circular polarization horn antenna with low secondary lobes may be designed by compensating the spherical wavefront of the aperture surface of the circular polarization horn antenna with a discrete phase compensation unit with any accuracy such as 2 bits.

In this embodiment, the linearly polarized horn antenna 4 is a conical linearly polarized horn antenna, and a large-end opening plane of the conical linearly polarized horn antenna is circular. The circular polarization horn antenna with high gain and low side lobe can be designed by simply designing the circular polarization horn antenna 4, not limited to a conical horn, being applicable to horn antennas with any shapes, and only reading the phase distribution on the diameter surface of the horn mouth according to the requirement, compensating the phase distribution by using the designed super-structure surface units according to the phase distribution, sequentially arranging the super-structure surface arrays matched with the diameter surface of the horn mouth, and finally loading the super-structure surface arrays on the diameter surface of the linear polarization horn.

It should be noted that the dimensions of the designed conical linearly polarized horn antenna and the metamaterial surface are determined according to the required frequency band.

In this embodiment, the dielectric constant of the upper dielectric plate 13, the dielectric constant of the lower dielectric plate a14, and the dielectric constant of the lower dielectric plate B15 are 2.55, and the loss tangent thereof is 0.0015.

In this embodiment, the circularly polarized horn antenna loaded with the metamaterial surface is not limited to the Ku waveband, and may be designed in various frequency bands, and indexes such as a circularly polarized bandwidth and a gain may be designed to be similar to the horn antenna according to specific requirements. And the linear polarization horn antenna used by the circularly polarized horn antenna loaded with the super-structure surface is not limited to a conical horn, but is also suitable for other horns in any shapes such as a pyramid horn, and the transmitted linear polarization wave can be converted into the circularly polarized wave as long as the linear polarization super-structure surface is loaded and converted into the circularly polarized wave in the horn according to the design, and the spherical wave can be converted into the plane wave in a phase compensation mode, so that the side lobe is reduced.

During operation, the linearly polarized electromagnetic wave emitted from the horn is subjected to phase compensation and 90-degree polarization rotation when passing through the lower-layer super-structure surface 8, and then generates circularly polarized wave through the upper-layer super-structure surface 7, so that the linearly polarized wave of the horn is converted into circular polarization. And because the phase compensation is carried out, the quasi-spherical wave formed by the coaxial waveguide converter 2, the square wave guide port-to-circular waveguide port adapter 3 and the conical linear polarization horn antenna 4 passes through the two layers of ultrastructural surfaces 7 and the ultrastructural surface 8, and then the electromagnetic wave is converted into the quasi-plane wave, so that the side lobe is reduced.

FIG. 4 is a schematic front view of the linear-to-circular polarization unit and the phase compensation unit, shown as two metal strips and a Z-shaped patch; FIG. 5 is a schematic diagram of a top view of the linear to circular polarization unit; fig. 6 is a schematic diagram of a structure of a double-broken-ring unit in the phase compensation unit.

FIG. 7 is a graph of the transmission amplitude and transmission phase of a designed lower phase compensating meta-surface 8 at normal incidence. The horizontal axis is frequency, the left vertical axis is transmission phase, and the right vertical axis is transmission amplitude coefficient, so that more than 90% of transmission amplitude is realized in the frequency range of 11-14.5GHz, and the transmission efficiency is high; in the frequency range of 11-15GHz, the phase curves of the eight cells are proportional to frequency, and it can be seen that the phase gradient difference between the designed 3-bit eight cells is 45 °. FIG. 8 is an axial ratio diagram of circular polarization generated by the designed 3-bit unit, wherein the horizontal axis is frequency, the vertical axis is axial ratio coefficient, the 3-dB axial ratio bandwidth is in the range of 11.8-14.5GHz, the circular polarization performance is good, and the circular polarization bandwidth is wide.

Fig. 9 is a phase compensation distribution diagram of a meta-surface lens calculated by reading the phase distribution of the aperture plane of the conical linearly polarized horn antenna 4 using MATLAB, the colors of which represent different compensation phases. Because a circular aperture horn antenna is used, actually required phase compensation data is within a black circle. The double-notched ring distribution in the middle of the lower layer microstructured surface is arranged according to the phase distribution of fig. 9.

FIG. 10 is a graph showing the change of the self-reflection coefficient S11 with frequency in the range of 11GHz to 15GHz, from which it can be seen that S11 is substantially below-10 dB in the range of 11GHz to 15 GHz. The impedance matching performance of the circularly polarized horn antenna is good.

FIG. 11 is a graph showing the axial ratio of the circularly polarized horn antenna in the range of 11GHz to 15GHz as a function of frequency, and it can be seen that the axial ratio of the circularly polarized horn antenna in the range of 11.5GHz to 14.7GHz is below 3dB, the axial ratio bandwidth is about 23.7%, the conversion from linear polarization to circular polarization is realized, and the bandwidth is wide.

Fig. 12 is a graph showing the variation of gain with frequency of the circularly polarized horn antenna and the linearly polarized conical horn antenna in the range of 11GHz to 15GHz, and it can be seen that the maximum gain of the linearly polarized horn antenna loaded with the super-structured surfaces 7 and 8 is about 19.4dBi, and the maximum gain of the linearly polarized horn antenna is about 7.5dBi. The gain of the circularly polarized horn antenna loaded with the super-structure surface is increased by about 2dBi compared with that of the original horn.

FIG. 13 is a normalized directional diagram of the XOZ plane of the circularly polarized horn antenna at 12.5GHz, with a sidelobe level of-16 dB; fig. 14 is the directional diagram of the YOZ plane of the circularly polarized horn antenna of the present invention at 12.5GHz, and the electric level of the side lobe is-26 dB.

The circularly polarized horn antenna loaded with the super-structured surface is realized by loading an upper super-structured surface 7 and a lower super-structured surface 8 on the aperture surface of the designed linearly polarized horn antenna. By designing the linear-to-circular polarization superstructure surface unit and the phase compensation superstructure surface unit and utilizing the phase compensation principle, the broadband high-gain circular polarization horn antenna is designed. Its advantages are no increase in size and weight of original linearly polarized loudspeaker, easy assembling and low cost.

As another embodiment, the linear-to-circular polarization metamaterial surface unit structure can be replaced at will, and only the designed requirement range needs to be satisfied, but not limited to, the linear-to-circular polarization conversion function, the phase compensation function and the like, so that the linear-to-circular polarization metamaterial can be loaded on the radial surface of the linear polarization horn to complete the conversion of linear-to-circular polarization waves.

The utility model has the advantages that:

(1) The used linear polarization horn antenna is a designed traditional conical horn antenna, the design process is simple, and the processing is convenient; moreover, the horn aperture extension fixing ring is designed, the super-structure surface is convenient to assemble and can be repeatedly utilized, and different super-structure surfaces are loaded, so that horn antennas with different performances are designed;

(2) The super-structure surface has simple design, convenient processing and low manufacturing cost;

(3) Eight 3-bit phase correction metamaterial surface units with 45 degrees as phase gradient differences from-180 degrees to 180 degrees are designed for the phase compensation units of the lower layer of the metamaterial surface, and can be used for phase compensation of the horn antenna, so that the circularly polarized horn antenna with high gain and low side lobes is realized, and the side lobe of the YOZ surface is basically lower than-26 dB; the designed circularly polarized horn antenna has a wider axial ratio bandwidth, and the problem of narrow bandwidth of the traditional circularly polarized horn antenna is solved; the designed circularly polarized horn antenna has higher gain;

(4) Compared with the S11 bandwidth and the axial ratio bandwidth of the traditional circularly polarized horn antenna, the designed circularly polarized horn antenna loaded with the super-structured surface is wider, and the gain is higher;

(5) The designed broadband high-gain circularly polarized horn antenna has strong universality, and for horn antennas with various frequency bands or arbitrary shapes, the high-gain low-side lobe circularly polarized horn antenna can be designed only by reading the phase distribution on the radial surface of the horn mouth according to requirements, compensating by using the designed super-structure surface units according to the phase distribution, arranging the super-structure surface arrays in sequence to be matched with the radial surface of the horn mouth, and finally loading the super-structure surface arrays on the radial surface of the linear polarized horn. The linear-to-circular polarization super-structure surface antenna unit can also adopt units with any phase compensation precision to compensate the spherical phase wavefront.

The utility model discloses if disclose or related to mutual fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding) can, of course, also be replaced by one-piece structures (e.g. manufactured in one piece using a casting process) (unless it is obvious that one-piece processes cannot be used).

In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.

The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the technical solution of the present invention, the present invention should be covered by the technical solution of the present invention.

Claims (9)

1. The utility model provides a broadband high-gain circular polarization horn antenna of load superstructure surface which characterized in that: the coaxial feed connector is arranged on the side face of the coaxial waveguide converter, and the coaxial waveguide converter is connected with the square wave guide port-to-circular waveguide port adapter and the linear polarization horn antenna through flanges; the two layers of the super-structure surfaces are distributed up and down and are arranged at the horn mouth diameter end of the linear polarization horn antenna, the two layers of the super-structure surfaces are an upper layer of the super-structure surface and a lower layer of the super-structure surface respectively, and the upper layer of the super-structure surface is formed by a plurality of lines of circularly polarized units; the lower-layer super-structure surface is formed by arranging a plurality of phase compensation units.

2. The broadband high-gain circularly polarized horn antenna with a loaded metamaterial surface as claimed in claim 1, wherein: the horn caliber end of the linear polarization horn antenna is connected with a horn caliber extension fixing ring, the upper-layer super-structure surface is fixed on the horn caliber extension fixing ring, and the upper-layer super-structure surface is flush with the upper surface of the horn caliber extension fixing ring; the lower-layer super-structure surface is tightly attached to a horn mouth diameter surface of the linearly polarized horn antenna.

3. The broadband high-gain circularly polarized horn antenna with a loaded metamaterial surface as claimed in claim 1, wherein: gaps are reserved between the upper layer of the superstructure surface and the lower layer of the superstructure surface, and the plurality of linear-to-circular polarization units are arranged in the same unit sequence; the phase compensation units are arranged according to the phase compensation distribution sequence.

4. The broadband high-gain circularly polarized horn antenna with a loaded metamaterial surface as claimed in claim 1 or 3, wherein: the linear-to-circular polarization unit comprises an upper-layer dielectric slab, a pair of metal strips is etched on the upper end face and the lower end face of the upper-layer dielectric slab, the pair of metal strips on the upper end face of the upper-layer dielectric slab and the pair of metal strips on the lower end face of the upper-layer dielectric slab are in orthogonal distribution, the pair of metal strips on the upper end face of the upper-layer dielectric slab are in left-right distribution, and the pair of metal strips on the lower end face of the upper-layer dielectric slab are in front-back distribution; z-shaped metal patches are etched in the middle of the upper end face and the lower end face of the upper dielectric plate, and the Z-shaped metal patches on the upper end face and the lower end face of the upper dielectric plate are distributed in a chiral symmetry mode.

5. The broadband high-gain circularly polarized horn antenna with a loaded metamaterial surface as claimed in claim 4, wherein: the thickness of the upper dielectric plate is one tenth of the free space wavelength of the central frequency of the working band.

6. The broadband high-gain circularly polarized horn antenna with a loaded metamaterial surface as claimed in claim 1 or 3, wherein: the phase compensation unit comprises a lower-layer dielectric slab A and a lower-layer dielectric slab B which are distributed up and down, metal gratings are etched on the upper end face of the lower-layer dielectric slab A and the lower end face of the lower-layer dielectric slab B, and the metal gratings on the upper end face of the lower-layer dielectric slab A and the metal gratings on the lower end face of the lower-layer dielectric slab B are distributed in an orthogonal mode; and a double-gap ring unit is etched between the lower dielectric plate A and the lower dielectric plate B.

7. The broadband high-gain circularly polarized horn antenna with a loaded metamaterial surface as claimed in claim 6, wherein: the double-gap ring unit is provided with eight 3-bit phase correction super-structure surface units with the phase gradient difference of 45 degrees from minus 180 degrees to 180 degrees, and the deflection angles of the eight phase correction super-structure surface units are +/-45 degrees.

8. The broadband high-gain circularly polarized horn antenna with a loaded metamaterial surface as claimed in claim 6, wherein: the thicknesses of the lower dielectric plate A and the lower dielectric plate B are one sixteenth of the free space wavelength of the central frequency of the working frequency band.

9. The broadband high-gain circularly polarized horn antenna with the loaded metamaterial surface as claimed in claim 1, wherein: the linearly polarized horn antenna adopts a conical linearly polarized horn antenna, and the large-end opening plane of the conical linearly polarized horn antenna is circular.

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