CN211789537U

CN211789537U - Dual-polarized inverted-logarithmic periodic antenna

Info

Publication number: CN211789537U
Application number: CN202020444809.4U
Authority: CN
Inventors: 张少林; 崔立成
Original assignee: Shenzhen Wave Technology Co Ltd
Current assignee: Shenzhen Wave Technology Co Ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-10-27
Anticipated expiration: 2030-03-31

Abstract

The invention relates to a dual-polarized inverted log periodic antenna. The dual-polarized inverted-logarithm periodic antenna comprises an antenna main body consisting of four assembly lines, a feed coaxial line tightly attached to the assembly lines and a plurality of antenna elements arranged on the assembly lines in an alternating equidistant parallel mode, the length of the antenna element close to the ground end of a first assembly line is shorter, and the feed coaxial line penetrates through a through hole in the assembly line to be connected to the other assembly line opposite to the assembly line. Above-mentioned structure has realized all having good gain's characteristics in the antenna is perpendicular, the horizontal direction through the double polarization, and the structure of symmetry has ensured antenna radiation's symmetry again simultaneously, carries out the double polarization and inverts to the antenna for the radiation direction of antenna is towards ground, makes ground can be with the whole reflection of the energy of radiating back, has reduced the dorsad radiation of antenna, has improved the whole gain of antenna, still can adjust set line length and antenna element quantity and realize high gain.

Description

Dual-polarized inverted-logarithmic periodic antenna

Technical Field

The invention relates to the field of antenna equipment and technology, in particular to a dual-polarized inverted-log periodic antenna.

Background

The log periodic antenna is a common antenna, has the characteristics of broadband and line planning due to the periodic working structure, and is widely applied to the fields of short-wave communication and microwave communication.

Disclosure of Invention

Therefore, it is necessary to provide a dual-polarized inverted-logarithmic period antenna for solving the problems of large loss and low gain of the polarized signal of the single-polarized logarithmic period antenna.

A dual polarized inverted log periodic antenna comprising:

an antenna main body including four same aggregation lines, namely a first aggregation line, a second aggregation line, a third aggregation line and a fourth aggregation line, sequentially arranged around a spatial axis, wherein the first aggregation line is arranged opposite to the third aggregation line, the second aggregation line is arranged opposite to the fourth aggregation line, a connection line between a midpoint of the first aggregation line and a midpoint of the third aggregation line is perpendicular to a connection line between a midpoint of the second aggregation line and a midpoint of the fourth aggregation line and perpendicular to the spatial axis, and the first aggregation line, the second aggregation line, the third aggregation line and the fourth aggregation line each include a near-ground end close to the ground and a far-ground end far from the ground; the antenna elements are alternately arranged on two sides of the first aggregation line relative to the direction of the space axis at equal intervals in sequence from the near-ground end of the first aggregation line to the far-ground end, the length of the antenna element closer to the near-ground end of the first aggregation line is shorter, and all the antenna elements on the first aggregation line are parallel to each other and are positioned on the same plane; a plurality of antenna oscillators are also arranged on the second aggregation line, the third aggregation line and the fourth aggregation line respectively, and the arrangement mode of the antenna oscillators is the same as that of the antenna oscillators of the first aggregation line;

the first coaxial line and the second coaxial line are respectively arranged on the first gathering line and the second gathering line and comprise coaxially arranged inner conductors, insulating medium layers and outer conductor layers, and the outer conductor layers of the first coaxial line and the second coaxial line are respectively attached to one sides, far away from the space axis, of the first gathering line and the second gathering line;

first set line with the second set line's near-to-ground end still is provided with first through-hole and second through-hole respectively, the shape and the size of first through-hole and second through-hole respectively with first coaxial line and second coaxial line suit, the output of first coaxial line and second coaxial line is connected to respectively first through-hole and second through-hole, just the inner conductor of first coaxial line and second coaxial line passes respectively first through-hole with the second through-hole is connected to the third set line with the fourth set line.

In one embodiment, each of the collective lines has a rectangular parallelepiped shape.

In one embodiment, the dual-polarized inverted-log periodic antenna further comprises:

a third coaxial line disposed on the third collective line, symmetrical to the first coaxial line with respect to the spatial axis;

and the fourth coaxial line is arranged on the fourth collecting line and is symmetrical to the second coaxial line about the space axis.

In one embodiment, the first set line, the third set line, and the input impedance of the first antenna single-polarization structure formed by the first coaxial line, the third coaxial line and the antenna element arranged on the first set line and the third set line, and the input impedance of the second antenna single-polarization structure formed by the second coaxial line, the fourth coaxial line and the antenna element arranged on the second set line and the fourth set line are both 50 ohms.

In one embodiment, the wires of the first coaxial line, the second coaxial line, the third coaxial line and the fourth coaxial line are 50 ohm coaxial lines.

In one embodiment, the opening height of the first through hole is higher than that of the second through hole.

In one embodiment, the dual-polarized inverted-log periodic antenna further includes a dielectric strip disposed in an area surrounded by the first set of lines, the second set of lines, the third set of lines, and the fourth set of lines.

In one embodiment, the length of the media strip matches the length of the first, second, third, and fourth aggregation lines.

In one embodiment, the dual-polarized inverted-log periodic antenna further includes two or more baluns, and each balun is connected to a different one of the first, second, third, and fourth sets of lines.

In one embodiment, the dual-polarized inverted-log periodic antenna further comprises a reflector plate, the reflector plate is arranged at the ground-near end of the antenna main body, and the antenna main body is grounded through the reflector plate.

Above-mentioned dual polarization inverted logarithm periodic antenna, through adopting the cross structure to realize that the dual polarization of two single polarization antenna element constitutes, dual polarization logarithmic periodic antenna has been realized, reducible signal polarization loss, the gain that makes the horizontal perpendicular bipartition of antenna is all good, carry out the dual polarization and invert to the antenna, make the radiation direction of antenna towards ground, make ground can be with the whole reflection of the energy of radiating back, the dorsad radiation of antenna has been reduced, the whole gain of antenna has been improved, the assembly line of every antenna and the equal piecemeal dismouting realization of the antenna element that sets up on it simultaneously, moreover, the steam generator is simple in structure, the installation of being convenient for make.

Drawings

FIG. 1 is a schematic diagram of a dual-polarized inverted-log periodic antenna in an embodiment;

FIG. 2 is a partial schematic view of a coaxial wire structure according to an embodiment;

FIG. 3 is a cross-sectional view of a portion of a dual-polarized inverted-log periodic antenna in one embodiment in one direction;

FIG. 4 is a top view of a dual-polarized inverted-log periodic antenna in one embodiment;

FIG. 5 is a schematic diagram of an antenna monopole structure according to an embodiment;

fig. 6 is a schematic structural diagram of a dual-polarized inverted-log periodic antenna in another embodiment.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Referring to fig. 1, the dual polarized inverted log periodic antenna of the present disclosure includes an antenna body 110, an antenna element 120, a first coaxial line 130 and a second coaxial line 140.

The antenna main body 110 includes four identical aggregation lines, which are a first aggregation line 111, a second aggregation line 112, a third aggregation line 113, and a fourth aggregation line 114, respectively, and the four aggregation lines are sequentially disposed around a spatial axis, wherein the first aggregation line 111 is disposed opposite to the third aggregation line 113, and the second aggregation line 112 is also disposed opposite to the fourth aggregation line 114. Meanwhile, a connecting line between the middle point of the first aggregation line 111 and the middle point of the third aggregation line 113 is perpendicular to a connecting line between the middle point of the second aggregation line 112 and the middle point of the fourth aggregation line 114, and is perpendicular to a spatial axis, that is, the four aggregation lines are not staggered, but are arranged in a length alignment manner, so that the antenna keeps relatively symmetrical and stable structure as much as possible.

First set line 111, second set line 112, third set line 113, it is provided with a plurality of antenna element 120 respectively all to gather on the line 114, antenna element 120 can be metal strip or metal bar, and the metalwork of other shapes, the both ends of each set line are called near ground end and far ground end respectively, near ground end is close to ground, far ground end keeps away from ground, a plurality of antenna element 120 on arbitrary set line all is from this set line near ground end to the direction of far ground end in turn set line for the both sides of space axis in turn, a left side is in turn along the direction equidistant ground setting from bottom to top in turn, and the antenna element that is close to near ground end more is short, a plurality of antenna element 120 on the same set line are parallel to each other and are in the coplanar simultaneously. The shorter the length of the antenna element 120 near the ground end of the first aggregation line 111, the more the antenna body 110 can be grounded through the ground end, and the antenna is reversely fed, so that the antenna radiates towards the ground, and ideally, the ground plane is equivalent to an infinite plane, so that energy is totally reflected back to the forward direction through the ground, the backward radiation of the antenna is reduced, and the overall gain of the antenna is improved.

The first coaxial line 130 and the second coaxial line 140 are respectively disposed on the first collective line 111 and the second collective line 112, as shown in fig. 2, the first coaxial line 130 and the second coaxial line 140 each include an inner conductor 131, an insulating dielectric layer 132, and an outer conductor layer 133 that are coaxially disposed, and the insulating dielectric layer 132 is disposed between the inner conductor 131 and the outer conductor layer 133 to ensure that they do not contact each other. When the coaxial cable is arranged, the outer conductor layers 133 of the first coaxial line 130 and the second coaxial line 140 are respectively attached to the outer sides, far away from the space axis, of the first aggregation line 111 and the second aggregation line 112 so as to generate a potential difference.

Referring to fig. 3, the first through hole 150 and the second through hole 160 are respectively disposed at the ground-proximal ends of the first aggregation line 111 and the second aggregation line 112, the first through hole 150 and the second through hole 160 may have shapes and sizes corresponding to the first coaxial line 130 and the second coaxial line 140, or may be larger than or smaller than the cross section of the coaxial line, the coaxial line disposed on the aggregation line may connect the output end to the through hole on the aggregation line where the output end is located, and further, the inner conductor of the aggregation line connected to the through hole may further extend continuously and is connected to the aggregation line opposite to the aggregation line where the coaxial line is located through the through hole, so as to form a feed structure. For example, the output end of the second coaxial line 140 disposed on the second aggregation line 112 is connected to the second via 160, while the inner conductor of the output end of the second coaxial line 140 further extends through the second via 160 to be connected to the fourth coaxial line 114, and the arrangement of the first aggregation line 111 and the first coaxial line 130 is also the same, which is not described herein.

In one embodiment, each collective line constituting the antenna body is shaped as a rectangular parallelepiped to facilitate mounting of components such as an antenna element, a coaxial line, and the like.

As shown in fig. 1 and 4, in one embodiment, the dual-polarized inverted-logarithmic periodic antenna further includes a third coaxial line 170 and a fourth coaxial line 180 respectively disposed on the third collective line 113 and the fourth collective line 114, and the third coaxial line 170 is symmetrical to the first coaxial line 130 about the spatial axis, and the fourth coaxial line 180 and the second coaxial line 140 are symmetrical about the spatial axis. In one embodiment, the third coaxial line 170 may also be equal in length to the first coaxial line 130, and the fourth coaxial line 180 may be equal in length to the second coaxial line 140. In another embodiment, the third coaxial line 170 is identical to the first coaxial line 130 and the fourth coaxial line 180 is identical to the second coaxial line 140. Through the coaxial lines symmetrical to the first coaxial line 130 and the second coaxial line 140, the structural symmetry of the dual-polarized inverted-logarithmic periodic antenna can be guaranteed, the symmetry of the radiation characteristic of the antenna is guaranteed, and the performance of the antenna is improved.

As shown in fig. 5, in one embodiment, the input impedance of the first and

third aggregation lines

111 and 113 and the first antenna single-polarization structure formed by the first and third

coaxial lines

130 and 170 and the antenna element disposed on the first and

third aggregation lines

111 and 113 is 50 ohms. The input impedance of the second antenna single-polarization structure composed of the second collective line 112 and the fourth collective line 114, and the second coaxial line 140, the fourth coaxial line 180, and the antenna element provided on the second collective line 112 and the fourth collective line 114 is also 50 ohms. The dual-polarized inverted-log periodic antenna does not need an impedance transformer, can directly adopt a 50-ohm coaxial line for feeding, and is convenient and stable and strong in adaptability. The top feed adopts coaxial feed which is connected with the integrated line in a clinging manner. Meanwhile, the bottom of the integrated wire can be used for coaxial feeding. Further, in one embodiment, the wires of the first coaxial line 130, the second coaxial line 140, the third coaxial line 170, and the fourth coaxial line 180 are all 50 ohm coaxial lines.

In one embodiment, the first through hole 150 is opened closer to the top end than the second through hole 160, so that the inner conductors of the first coaxial line 130 and the second coaxial line 140 are not overlapped when being connected to the third aggregation line 113 and the fourth aggregation line 114, respectively, to avoid interference.

In one embodiment, the dual-polarized inverted log periodic antenna further includes a dielectric strip disposed in an area surrounded by the first set line 111, the second set line 112, the third set line 113, and the fourth set line 114. The size of the dielectric strip is not unique, in this embodiment, the cross-sectional area of the dielectric strip is equal to the cross-sectional area of the area formed by the first aggregation line 111, the second aggregation line 112, the third aggregation line 113 and the fourth aggregation line 114, so that the dielectric strip is fixed, the working stability is improved, the length of the dielectric strip can be equal to the distance between the antenna oscillators 120 arranged at two ends of the same aggregation line, and the material waste can not be caused on the premise of ensuring the working effect. The dual-polarization inverted-logarithmic periodic antenna utilizes a quasi-periodic model, the oscillators are not crossed, the array elements are each pair of oscillators, the four pairs of oscillators are dual-polarized, the length of each layer of oscillators is different, wider bandwidth is achieved, and the intervals of the array elements are different. The Hansen-Wood's terminal emitting condition is realized by adding the dielectric strips in the middle of the feed collection plate, dielectric strip dielectric constants of all layers of oscillators are different, and a strong terminal emitting array is formed, so that the purpose of improving the gain of the antenna is realized.

In one embodiment, referring to fig. 6, the dual-polarized inverted-log periodic antenna further includes more than two baluns 210, and each balun 210 is connected to a different one of the first aggregation line 111, the second aggregation line 112, the third aggregation line 113, and the fourth aggregation line 114. Specifically, in the present embodiment, taking the example that the dual-polarized inverted-log periodic antenna includes the first balun and the second balun, the port of the first balun is connected to the first aggregation line 111, and the port of the second balun is connected to the second aggregation line 112, and further, the port of the balun connected to the aggregation line may further continue to extend to be connected to the aggregation line opposite to the connected aggregation line, so as to constitute the feeding structure. The connection relationship between the other baluns and the assembly line can be analogized, and the description is omitted here. The positions of the baluns 210 are not unique, in this embodiment, each balun 210 is disposed at the ground end of the antenna body, and the antenna body can realize balanced feeding of the antenna elements by using more than two baluns 210 to form a feeding structure, thereby improving the working performance of the dual-polarized inverted-log periodic antenna.

In one embodiment, referring to fig. 6, the novel dual-polarized log-periodic antenna may further include a reflector plate 220 disposed at the ground end of the antenna body 110. Specifically, the ground-proximal end of the antenna main body 110 is an end close to the ground. Further, when the novel dual polarized log periodic antenna includes the balun 210, the antenna body 110 is disposed on the reflection plate 220 through the balun 210, and the reflection plate 220 is disposed on the ground. Through setting up reflecting plate 220, can assemble the reflection away with antenna backward wave beam through reflecting plate 220 to improve the front-to-back ratio of antenna effectively, also have certain effect to improving antenna gain and directionality, improve the antenna performance.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A dual polarized inverted log periodic antenna, comprising:

the antenna comprises an antenna main body and a plurality of antenna groups, wherein the antenna main body comprises four same aggregation lines, namely a first aggregation line, a second aggregation line, a third aggregation line and a fourth aggregation line, which are sequentially arranged around a space axis, the first aggregation line and the third aggregation line are oppositely arranged, the second aggregation line and the fourth aggregation line are oppositely arranged, a connecting line between a midpoint of the first aggregation line and a midpoint of the third aggregation line is perpendicular to a connecting line between the midpoint of the second aggregation line and the midpoint of the fourth aggregation line, and is drooping on the space axis, and the first aggregation line, the second aggregation line, the third aggregation line and the fourth aggregation line respectively comprise a near-ground end close to the ground and a far-ground end far away from the ground; the antenna elements are alternately arranged on two sides of the first aggregation line relative to the direction of the space axis at equal intervals in sequence from the near-ground end of the first aggregation line to the far-ground end, the length of the antenna element closer to the near-ground end of the first aggregation line is shorter, and all the antenna elements on the first aggregation line are parallel to each other and are positioned on the same plane; a plurality of antenna oscillators are also arranged on the second aggregation line, the third aggregation line and the fourth aggregation line respectively, and the arrangement mode of the antenna oscillators is the same as that of the antenna oscillators of the first aggregation line;

the first coaxial line and the second coaxial line are respectively arranged on the first aggregation line and the second aggregation line and comprise an inner conductor, an insulating medium layer and an outer conductor layer which are coaxially arranged, the insulating medium layer is arranged between the inner conductor and the outer conductor layer, and the outer conductor layer of the first coaxial line and the second coaxial line are respectively attached to one sides, far away from the space axis, of the first aggregation line and the second aggregation line;

2. The dual polarized inverted log periodic antenna of claim 1, wherein each of the aggregate lines is shaped as a rectangular parallelepiped.

3. The dual polarized inverted log periodic antenna of claim 1, further comprising:

4. The dual-polarized inverted-log periodic antenna according to claim 3, wherein the input impedance of the first antenna single-polarization structure formed by the first set line, the third set line, the first coaxial line, the third coaxial line and the antenna element arranged on the first set line and the third set line, and the input impedance of the second antenna single-polarization structure formed by the second set line, the fourth set line, the second coaxial line, the fourth coaxial line and the antenna element arranged on the second set line and the fourth set line are both 50 ohms.

5. The dual polarized inverted log periodic antenna of claim 4, wherein wires of the first, second, third and fourth coaxial lines are 50 ohm coaxial lines.

6. The dual polarized inverted log periodic antenna of claim 1, wherein the opening height of the first via is higher than the opening height of the second via.

7. The dual-polarized inverted-log periodic antenna according to claim 1, further comprising a dielectric strip disposed in an area surrounded by the first set of lines, the second set of lines, the third set of lines, and the fourth set of lines.

8. The dual polarized inverted log periodic antenna of claim 7, wherein the length of the dielectric strip matches the length of the first, second, third and fourth sets of lines.

9. The dual polarized inverted log periodic antenna of claim 1, further comprising two or more baluns, each balun connected to a different one of the first, second, third, and fourth sets of lines.

10. The dual polarized inverted log periodic antenna of claim 1, further comprising a reflector plate disposed at a ground proximal end of the antenna body, the antenna body being grounded through the reflector plate.