CN214203968U - Ka-band center feed rotary array antenna - Google Patents

Abstract

The utility model discloses a Ka wave band center feed rotary array antenna, which comprises a plurality of annular structure unit antennas; the annular structure unit antenna comprises an annular radiation patch and a matching structure; the upper surface of annular radiation paster and the upper surface of matching structure are located the coplanar, and the upper surface of matching structure is located the circular plane that the interior boundary of annular radiation paster encloses, or the matching structure is located the below of annular radiation paster, and the projection of the interior boundary of matching structure falling annular radiation paster. The utility model discloses arrange the feed point in antenna rotation center, solved the problem of rotatory feed, simultaneously through little winding method separation degenerate mould, realize the circular polarization.

Description

Ka-band center feed rotary array antenna

Technical Field

The utility model relates to an antenna field, concretely relates to rotatory array antenna of Ka wave band center feed.

Background

Antennas play a critical role in wireless communication systems as important transceiver devices. Although the linear polarization antenna is still used by most wireless communication systems at present, the circularly polarized antenna has the advantages of multipath reflection resistance and the like, so that the circularly polarized antenna replaces the linear polarization antenna in the scenes of military communication, satellite navigation, satellite communication and the like. The circular polarization technology must be applied to more wireless communication application scenes in the future, which makes the circular polarization antenna a current research hotspot.

The method for realizing circular polarization is to generate linear polarization components which are equal in amplitude, 90-degree in phase difference and orthogonal in space, and can be applied to a single feed method, a multi-element method, a traveling wave method and the like to realize circular polarization. In the design of the Ka frequency band array antenna, in order to improve the axial ratio of the whole array, a set of 2 x 2 rotating feeds of the element antenna are needed, and because the feed point is not at the rotating center, 4 feed points with different positions are generated in the rotation, thereby bringing complexity to the design of a following network.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: in Ka frequency channel array antenna design, the feed point is not at the rotation center, has 4 different feed points in position, is unfavorable for the design of feed network, the utility model provides a solve the rotatory array antenna of Ka wave band center feed of above-mentioned problem.

The utility model discloses a following technical scheme realizes:

a Ka-band center-fed rotary array antenna comprises a plurality of annular structure unit antennas; the annular structure unit antenna comprises an annular radiation patch and a matching structure; the upper surface of annular radiation paster with matching structure's upper surface is located the coplanar, just matching structure's upper surface is located in the circular plane that the boundary encloses in the annular radiation paster, or matching structure is located the below of annular radiation paster, just matching structure falls in the projection of the boundary in the annular radiation paster.

The matching structure and the inner boundary of the annular radiation patch generate a distribution effect, the distribution effect effectively compensates an imaginary part seen by the input port of the annular structure unit antenna, simultaneously converts the input impedance of the inner boundary of the annular radiation patch into the input impedance of the port, places the port at the rotation center of the array antenna, and then matches the input impedance of the annular structure unit antenna with the port impedance by using a matching section, so that the feeding point of the array antenna is located at the rotation center of the rotation array antenna.

Preferably, the loop structure element antenna further comprises a feed probe, a dielectric substrate and a floor; the dielectric substrate is located on the upper surface of the floor, and one end of the feed probe penetrates through the dielectric substrate and is connected with the matching structure.

When the upper surface of annular radiation paster with the upper surface of matching structure is located the coplanar, just the upper surface of matching structure is located in the circular plane that the border encloses in the annular radiation paster, the annular radiation paster with the matching structure all is located in the medium base plate, or the annular radiation paster with the matching structure all is located medium base plate upper surface.

When the matching structure is located the below of annular radiation paster, just the matching structure falls when in the projection of boundary in the annular radiation paster, the annular radiation paster is located the upper surface of medium base plate, the matching structure is located in the medium base plate, or the annular radiation paster with the matching structure all is located in the medium base plate.

Preferably, the loop structure unit antenna further includes a decoupling unit, the decoupling unit is disposed at the periphery of the radiation patch, and the decoupling unit provides a cavity for the loop structure unit antenna, so that the radiation floor of the loop structure unit antenna is enlarged, and the coupling degree between the array antennas is reduced.

Preferably, the decoupling unit comprises a decoupling frame and a plurality of metalized vias. The height of the metalized via hole is the same as the thickness of the dielectric substrate.

Preferably, one end of the metalized via is connected with the floor, and the other end of the metalized via penetrates through the dielectric substrate to be connected with the decoupling frame.

Preferably, the decoupling frame is a rectangular coupling frame.

Preferably, the matching structure is a racket-type matching structure.

Preferably, two rectangular open grooves are formed in the outer side of the annular radiation patch, and the central connecting line of the two rectangular open grooves and the central line of the racket-shaped matching structure form an included angle of 45 degrees.

The rectangular slot realizes two orthogonal degenerate modes of the main mode of the annular structure, and the 45-degree included angle realizes the circularly polarized rotation direction of the antenna.

Preferably, a circular hole for providing an electrical ground for the loop structure antenna is arranged on the floor, the circle center coordinate of the circular hole is the same as the circle center coordinate of the feed probe, and the radius of the circular hole is larger than that of the feed probe.

The utility model discloses have following advantage and beneficial effect:

the utility model relates to a rotatory array antenna of Ka wave band center feed through loop configuration unit antenna, arranges the feed point in array antenna's rotation center, has solved rotatory group's array feed point and is not at rotation center, causes the complicated problem of feed network design.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a three-dimensional structure diagram of a Ka-band center-fed rotary array antenna according to the present invention.

Fig. 2 is a standing wave diagram of a Ka-band center-fed rotating array antenna according to the present invention.

Fig. 3 is an axial ratio diagram of a Ka-band center-fed rotary array antenna according to the present invention.

Reference numbers and corresponding part names in the drawings:

the antenna comprises a 1-annular radiation patch, a 2-matching structure, a 3-dielectric substrate, a 4-metalized via hole, a 5-decoupling frame and a 6-floor.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

Examples

In the design of the Ka-band array antenna, in order to improve the axial ratio of the whole array, a group of 2 × 2 rotating feeds of the unit antenna are required, and since the feed point is not at the rotating center, 4 feed points with different positions are generated in the rotation, which brings complexity to the design of a back feed network.

The embodiment provides a Ka-band center-fed rotating array antenna on the basis of a microstrip antenna, a feed point is arranged at the antenna rotating center, the problem of rotating feed is solved, and simultaneously, a degenerate mode is separated through a micro-winding method to realize circular polarization.

A Ka-band center-fed rotary array antenna comprises a plurality of annular structure unit antennas; the annular structure unit antenna comprises anannular radiation patch 1 and amatching structure 2; the upper surface of theannular radiation patch 1 and the upper surface of thematching structure 2 are positioned on the same plane, and the upper surface of the matching structure is positioned in a circular plane surrounded by the inner boundary of the annular radiation patch; or the matching structure is located below the annular radiation patch and the matching structure falls within a projection of an inner boundary of the annular radiation patch.

The loop structure unit antenna of the present embodiment is specifically shown in fig. 1: the device comprises anannular radiation patch 1, a racket-shaped matching structure 2, a metal feed probe, a dielectric substrate 3, a plurality of metalized throughholes 4, a decoupling frame 5 and a floor 6; theannular radiation patch 1 realizes electromagnetic field radiation, theannular radiation patch 1, the dielectric substrate 3 and the floor 7 are arranged in a stacked manner from top to bottom, the racket-shaped matching structure 2 is positioned in a circle surrounded by the inner boundary of theannular radiation patch 1, the upper surface of the racket-shaped matching structure 2 and the upper surface of theannular radiation patch 1 are positioned on the same plane, the radius of the metal feed probe is 0.2mm, one end of the metal feed probe penetrates through the dielectric substrate 3 to be connected with the racket-shaped matching structure 2, and the other end of the metal feed probe is connected with the feed network; two rectangular slots are arranged on the outer side of theannular radiation patch 1, the central line of the two rectangular slots and the central line of the racket-shaped matching structure form an included angle of 45 degrees, the two rectangular slots realize two orthogonal degenerate modes of the main mode of the annular structure unit antenna, and the 45-degree included angle realizes the rotation direction of circular polarization of the antenna. The inner boundary of the racket-shaped matching structure 2 and theannular radiation patch 1 generates a distribution effect, the distribution effect effectively compensates an imaginary part seen by the input port of the annular structure unit antenna, simultaneously converts the input impedance of the inner boundary of theannular radiation patch 1 to the input impedance of the port, places the port at the rotation center of the array antenna, and then matches the input impedance of the annular structure unit antenna with the port impedance by using a matching section, so that the feeding point of the array antenna is located at the rotation center of the array antenna.

The heights of the plurality of metalized throughholes 4 are the same as the thickness of the dielectric substrate 3, the thickness of the dielectric substrate 3 is 0.5mm, the dielectric substrate 3 is realized by adopting a printed board base material, and the dielectric substrate 3 can realize the miniaturization of the annular structure unit antenna; the height of the metallized throughholes 4 is 0.4-0.6mm, the metallized throughholes 4 are arranged on the periphery of theannular radiation patch 1, one ends of the metallized throughholes 4 are connected with a floor 6, the other ends of the metallized through holes penetrate through the dielectric substrate 3 and are connected with the decoupling frame 5, the decoupling frame 5 is a rectangular frame, and the metallized throughholes 4 and the decoupling frame 5 provide a cavity for the annular structure unit antenna, so that the radiation floor of the annular structure unit antenna is enlarged, and the coupling degree between the array antennas is reduced.

And a round hole for providing an electrical ground for the annular structure antenna is arranged on the floor 6, the circle center coordinate of the round hole is the same as that of the metal feed probe, and the radius of the round hole is larger than that of the metal feed probe.

In other embodiments, when the upper surface of theannular radiation patch 1 and the upper surface of thematching structure 2 are located on the same plane, and the upper surface of the matching structure is located in a circular plane surrounded by the inner boundary of the annular radiation patch, theannular radiation patch 1 and thematching structure 2 are both located in the dielectric substrate 3; when thematching structure 2 is located below theannular radiation patch 1 and thematching structure 2 falls in the projection of the inner boundary of theannular radiation patch 1, theannular radiation patch 1 and thematching structure 2 are both located in the dielectric substrate 3, or theannular radiation patch 1 is located on the upper surface of the dielectric substrate 3, and thematching structure 2 is located in the dielectric substrate 3.

Fig. 2 shows the standing wave of the antenna of this embodiment, and it can be seen that the antenna achieves good matching in this frequency band under center feeding.

Fig. 3 is an axial ratio of the antenna of the present embodiment, and it can be seen that the antenna realizes circular polarization under center feed.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A Ka-band center-fed rotary array antenna is characterized by comprising a plurality of annular structure unit antennas; the annular structure unit antenna comprises an annular radiation patch (1) and a matching structure (2);

the upper surface of annular radiation paster (1) with the upper surface of matching structure (2) is located the coplanar, just the upper surface of matching structure (2) is located in the circular plane that the boundary encloses in annular radiation paster (1), or matching structure (2) is located the below of annular radiation paster (1), just matching structure (2) fall in the projection of the boundary in annular radiation paster (1).

2. The Ka-band center-fed rotary array antenna according to claim 1, wherein the loop structure element antenna further comprises a feed probe, a dielectric substrate (3) and a floor (6); the dielectric substrate (3) is located on the upper surface of the floor (6), and one end of the feed probe penetrates through the dielectric substrate (3) and is connected with the matching structure (2).

3. The Ka-band center-fed rotary array antenna according to claim 2, wherein when the upper surface of the annular radiation patch (1) and the upper surface of the matching structure (2) are located in the same plane, and the upper surface of the matching structure (2) is located in a circular plane enclosed by the inner boundary of the annular radiation patch (1), the annular radiation patch (1) and the matching structure (2) are both located in the dielectric substrate (3), or the annular radiation patch (1) and the matching structure (2) are both located on the upper surface of the dielectric substrate (3).

4. A Ka-band center-fed rotary array antenna according to claim 2, wherein when the matching structure (2) is located below the annular radiating patch (1) and the matching structure (2) falls within the projection of the inner boundary of the annular radiating patch (1), the annular radiating patch (1) is located on the upper surface of the dielectric substrate (3), the matching structure (2) is located within the dielectric substrate (3), or the annular radiating patch (1) and the matching structure (2) are both located within the dielectric substrate (3).

5. The rotating array antenna of Ka band center feed of claim 2, characterized in that the loop structure element antenna further comprises a decoupling element, the decoupling element is arranged at the periphery of the loop radiation patch (1).

6. A Ka-band center-fed rotary array antenna according to claim 5, wherein the decoupling unit comprises a decoupling rim (5) and a plurality of metallized vias (4), one end of each metallized via (4) is connected to the ground plane (6), and the other end of each metallized via (4) penetrates through the dielectric substrate (3) to be connected to the decoupling rim (5).

7. A Ka-band center-fed rotary array antenna according to claim 6, wherein the decoupling rims (5) are rectangular.

8. A Ka-band centre-fed rotary array antenna according to claim 1, characterized in that the matching structure (2) is a racquet-type matching structure.

9. The Ka-band center-fed rotary array antenna according to claim 8, wherein two rectangular slots are formed on the outer side of the annular radiating patch (1), and the central connecting line of the two rectangular slots forms an included angle of 45 degrees with the central line of the racket-shaped matching structure.

10. The Ka-band center-fed rotary array antenna according to claim 2, wherein a circular hole for providing an electrical ground for the loop structure element antenna is arranged on the floor (6), the circular hole has a center coordinate same as that of the feed probe, and the radius of the circular hole is larger than that of the feed probe.

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