A dual-frequency metamaterial dual-polarization radiation unit and antenna

Abstract

The present invention discloses a dual-frequency metamaterial dual-polarization radiation unit and antenna, the radiation unit comprises a base circuit board, a balun assembly and a dual-polarization radiation element; the two ends of the balun assembly are respectively connected to the base circuit board and the dual-polarization radiation element for feeding; the front of the dual-polarization radiation element is provided with a dual-polarization radiation microstrip line layer, the radiation microstrip line layer is connected to the base grounding layer of the base circuit board via the balun grounding layer of the balun assembly; the back of the dual-polarization radiation element is provided with a metamaterial sheet layer, the metamaterial sheet layer comprises a plurality of geometric pattern sheets arranged periodically. The present invention can realize dual-band operation, and the overall structure is simple and occupies a small volume.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a dual-frequency metamaterial dual-polarization radiation unit and an antenna. Background Art

[0002] With the development of new mobile communication technology, based on the coexistence of 2G, 3G, 4G and 5G, frequency band and standard diversity is one of the characteristics of the current network. In order to save investment costs and avoid duplication of projects, operators require antennas to support multiple frequency bands as much as possible. For example, "increasing frequency without increasing size, high quality and durability" is a key requirement for multi-frequency antenna deployment. However, the traditional antenna design method requires adding an array to increase the frequency band, which leads to a larger antenna size. Among them, the radiation unit is the main component of the antenna. The quality of the radiation unit directly affects the quality of the antenna, and the conventional radiation unit does not support dual-frequency and occupies a large space. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a dual-frequency metamaterial dual-polarization radiation unit and antenna, which can realize dual-band operation, have a simple overall structure and occupy a small volume.

[0004] In order to solve the above technical problems, the present invention provides a dual-frequency metamaterial dual-polarization radiation unit, including a base circuit board, a balun component and a dual-polarization radiation element; the two ends of the balun component are respectively connected to the base circuit board and the dual-polarization radiation element for feeding; the front side of the dual-polarization radiation element is provided with a dual-polarization radiation microstrip line layer, and the radiation microstrip line layer is connected to the base ground layer of the base circuit board via the balun ground layer of the balun component; the back side of the dual-polarization radiation element is provided with a metamaterial sheet layer, and the metamaterial sheet layer includes a plurality of geometric pattern sheets arranged in a periodic manner.

[0005] As an improvement of the above-mentioned scheme, the balun component includes two feeding baluns arranged crosswise with each other, and both ends of the feeding balun are provided with feeding ends, and the feeding ends include two feeding parts; one feeding end of the feeding balun is fixedly mounted on the base circuit board, and the other feeding end of the feeding balun is installed with the dual-polarization radiator.

[0006] As an improvement of the above scheme, the feeding balun includes a balun dielectric layer, a balun microstrip line layer is provided on the front side of the dielectric layer, and a balun ground layer is provided on the back side of the dielectric layer; the balun microstrip line layer is connected to the base microstrip line layer of the base circuit board through a feeding end, and establishes a coupling state with the metamaterial sheet layer through another feeding end, and the two are not connected to each other; the balun ground layer is connected to the base ground layer of the base circuit board through a feeding end, and is connected to the radiating microstrip line layer through another feeding end.

[0007] As an improvement of the above scheme, the radiating microstrip line layer includes two groups of microstrip line groups with mutually orthogonal polarization directions, the microstrip line groups are not connected to each other, and the microstrip line group includes two microstrip lines that are not connected to each other; the microstrip lines are respectively connected to the balun ground layer through corresponding feeding parts.

[0008] As an improvement of the above solution, the number of the geometric graphic pieces is at least four, gaps are left between the geometric graphic pieces, and the geometric graphic pieces include regular polygonal graphic pieces.

[0009] As an improvement of the above solution, a radiation dielectric layer is provided between the radiation microstrip line layer and the metamaterial sheet layer, and the dielectric constant ε of the radiation dielectric layer is in the range of 1.5≤ε≤5.

[0010] As an improvement of the above solution, the base circuit board and the dual-polarized radiating element are both provided with mounting holes corresponding to the feeding parts one by one, and the feeding parts are inserted into the mounting holes and fixedly connected.

[0011] As an improvement of the above solution, the base circuit board includes a base dielectric layer, a base microstrip circuit layer is provided on the front side of the base dielectric layer, and a base grounding layer is provided on the back side of the dielectric layer.

[0012] As an improvement of the above solution, the dielectric constant ε of the balun dielectric layer and the base dielectric layer are both in the range of 1.5≤ε≤5.

[0013] The present invention also provides an antenna, comprising the dual-frequency metamaterial dual-polarization radiation unit as described above.

[0014] The implementation of the present invention has the following beneficial effects:

[0015] The dual-frequency metamaterial dual-polarization radiation unit and antenna of the present invention can achieve dual polarization of positive and negative 45 degrees, improve antenna performance such as bandwidth and radiation efficiency, and can achieve dual-band operation through the set metamaterial layer, and has a simple overall structure and occupies a small volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the dual-frequency metamaterial dual-polarization radiation unit of the present invention. Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the structure of the dual-frequency metamaterial dual-polarization radiation unit of the present invention. Figure 2 ;

[0018] Figure 3 A schematic diagram of the structure of the balun assembly of the present invention;

[0019] Figure 4 It is a structural schematic diagram of the feeding balun of the present invention;

[0020] Figure 5 A schematic structural diagram of a dual-polarized radiator of the present invention;

[0021] Figure 6 It is a structural schematic diagram of the base circuit board of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0023] like Figures 1 to 6 As shown, a specific embodiment of the present invention provides a dual-frequency metamaterial dual-polarization radiation unit, including a base circuit board 1, a balun assembly 2 and a dual-polarization radiation element 3; the base circuit board 1, the balun assembly 2 and the dual-polarization radiation element 3 are all made of PCB boards. The two ends of the balun assembly 2 are respectively connected to the base circuit board 1 and the dual-polarization radiation element 3 for feeding to achieve signal transmission. Specifically, the balun assembly 2 includes two feeding baluns 21 arranged crosswise with each other, and both ends of the feeding balun 21 are provided with feeding ends 22, and the feeding ends 22 include two feeding parts 23, and the two feeding parts 23 are located on the left and right sides of the feeding end 22. The base circuit board 1 and the dual-polarization radiation element 3 are provided with mounting holes 4 corresponding to the feeding parts 23, and the feeding ends 22 are correspondingly plugged into the mounting holes 4. One feeding end 22 of the feeding balun 21 is installed on the base circuit board 1 through the mounting hole 4 on the base circuit board 1, and the other feeding end 22 of the feeding balun 21 is installed with the dual-polarization radiating element 3 through the mounting hole 4 on the dual-polarization radiating element 3, thereby improving the overall firmness.

[0024] A dual-polarized radiating element 3 has a dual-polarized radiating microstrip line layer 32 on the front side, and the radiating microstrip line layer 32 is connected to the base ground layer 13 of the base circuit board 1 via the balun ground layer 213 of the balun component 2; a metamaterial sheet layer 33 is provided on the back side of the dual-polarized radiating element 3, and the metamaterial sheet layer 33 includes a plurality of periodically arranged geometric pattern sheets 331. The dual-polarized radiation microstrip line layer 32 can realize the positive and negative 45-degree dual-polarized radiation function, thereby improving antenna performance such as bandwidth and radiation efficiency; the metamaterial layer 33 can influence the electromagnetic wave to generate two resonant waves to achieve a dual-frequency effect; and the height of the half-wave oscillator of the conventional radiation unit is 1 / 4λ (the wavelength of the center frequency point), and the height of the oscillator can be reduced to 1 / 10λ (the wavelength of the center frequency point) by using metamaterials. The present invention uses metamaterials to achieve dual-frequency bands, and the volume is similar to that of a conventional half-wave oscillator, or even smaller, and can replace two conventional single-frequency oscillators, so that the overall structure is simple and occupies a small volume.

[0025] It should be noted that, in response to the frequency requirements of different dual-bands, the overall size of the radiation unit can be adjusted accordingly after actual debugging and simulation, such as adjusting the size of the dual-polarization radiation element 3 and the size and number of the geometric pattern piece 331 and adjusting the size of the balun component 2 and the base circuit board 1 accordingly, so that the dual-polarization radiation unit can meet the requirements of 690MHz~960MHz&1710MHz~2700MHz or 3300MHz~3800MHz&4700MHz~5100MHz or other different dual-band requirements, thereby meeting the actual usage needs of users.

[0026] Preferably, if Figures 1 to 4 As shown, the feeding balun 21 includes a balun dielectric layer 211, a balun microstrip line layer 212 is provided on the front side of the dielectric layer, and a balun ground layer 213 is provided on the back side of the dielectric layer; the balun microstrip line layer 212 is connected to the base microstrip line 322 in the base microstrip line layer 12 of the base circuit board 1 through a feeding end 22, and also establishes a coupling state with the metamaterial sheet layer 33 through another feeding end 22, and the two are not connected to each other; the balun ground layer 213 is connected to the base ground layer 13 of the base circuit board 1 through a feeding end 22, and is also connected to the radiating microstrip line layer 32 through another feeding end 22, so as to realize the signal transmission of the dual-polarization radiation unit.

[0027] Among them, Figures 1 to 2 and Figures 5 to 6As shown, the base circuit board 1 includes a base dielectric layer 11, a base microstrip circuit layer 12 is provided on the front side of the base dielectric layer 11, and a base grounding layer 13 is provided on the back side of the dielectric layer. A radiation dielectric layer 31 is provided between the radiation microstrip circuit layer 32 and the metamaterial sheet layer 33, and the dielectric constant ε of the radiation dielectric layer 31 is in the range of 1.5≤ε≤5. The dielectric constant ε of the balun dielectric layer 211 and the base dielectric layer 11 are both in the range of 1.5≤ε≤5.

[0028] It should be noted that the radiating microstrip circuit layer 32, the balun microstrip circuit layer 212 and the base microstrip circuit layer 12 are all the front copper clad layers of the corresponding PCB board, and the metamaterial sheet layer 33, the balun grounding layer 213 and the base grounding layer 13 are all the back copper clad layers of the corresponding PCB board.

[0029] Preferably, in this embodiment, the dual-polarized radiator 3 and the base circuit board 1 are both square PCB boards, and the size of the base circuit board 1 is larger than the dual-polarized radiator 3. The shapes of the dual-polarized radiator 3 and the base circuit board 1 are not limited thereto and can be adjusted according to actual needs.

[0030] Preferably, if Figure 1 As shown, the radiating microstrip line layer 32 includes two groups of microstrip line groups 321 with mutually orthogonal polarization directions, the microstrip line groups 321 are not connected to each other, and the microstrip line group 321 includes two microstrip lines 322 that are not connected to each other; the microstrip lines 322 are respectively connected to the balun ground layer 213 through the corresponding feeding parts 23 to realize positive and negative 45 degree dual polarization radiation operation.

[0031] It should be noted that, according to the wavelength of the frequency band required to be supported by the actual radiation unit, the line length of the microstrip line 322 can be adjusted accordingly to meet the actual production application needs. According to the impedance matching requirements of the actual radiation unit, the line width of the microstrip line 322 can be adjusted accordingly to meet the actual production application needs. No excessive restrictions are imposed here.

[0032] Preferably, the number of the geometric pattern pieces 331 is at least four, and gaps are left between the geometric pattern pieces 331 in the metamaterial sheet layer 33. The geometric pattern pieces 331 include regular polygonal pattern pieces (such as regular quadrilaterals or regular hexagons. The number and specific shapes of the geometric pattern pieces 331 can be adjusted according to actual needs and are not restricted too much.

[0033] It should be noted that, according to the impedance matching requirements of the actual radiation unit, the gap width of the geometric pattern piece 331 can be adjusted accordingly to meet the actual production application needs; according to the wavelength of the frequency band required to be supported by the actual radiation unit, the size and quantity of the geometric pattern piece 331 can be adjusted accordingly to meet the actual production application needs.

[0034] The present invention also provides an antenna, comprising the dual-frequency metamaterial dual-polarization radiating unit as described above. Since the dual-frequency metamaterial dual-polarization radiating unit has the above technical effects, the antenna comprising the dual-frequency metamaterial dual-polarization radiating unit should also have the above technical effects, which will not be repeated here.

[0035] In summary, the present invention can achieve dual polarization of positive and negative 45 degrees, improve antenna performance such as bandwidth and radiation efficiency, and realize dual-band operation through the provision of metamaterial layers. In addition, the overall structure is simple and occupies a small volume.

[0036] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A dual-frequency metamaterial dual-polarization radiation unit, characterized in that: Including base circuit board, balun assembly and dual-polarization radiator; Two ends of the balun component are respectively connected to the base circuit board and the dual-polarization radiating element for feeding; A dual-polarized radiation microstrip line layer is provided on the front side of the dual-polarized radiation element, and the radiation microstrip line layer is connected to the base ground layer of the base circuit board via the balun ground layer of the balun component; A metamaterial sheet layer is provided on the reverse side of the dual-polarization radiating element, and the metamaterial sheet layer includes a plurality of geometric pattern sheets arranged in a periodic manner; The balun assembly includes two feeding baluns arranged crosswise with each other, both ends of the feeding balun are provided with feeding ends, and the feeding ends include two feeding parts; One feeding end of the feed balun is fixedly mounted on the base circuit board, and the other feeding end of the feed balun is mounted with the dual-polarized radiator; The feeding balun comprises a balun dielectric layer, a balun microstrip line layer is provided on the front side of the dielectric layer, and a balun ground layer is provided on the back side of the dielectric layer; The balun microstrip circuit layer is connected to the base microstrip circuit layer of the base circuit board through a feeding end, and is coupled to the metamaterial sheet layer through another feeding end, and the two are not connected to each other; The balun ground layer is connected to the base ground layer of the base circuit board through a feeding end, and is also connected to the radiation microstrip circuit layer through another feeding end; The radiating microstrip line layer includes two groups of microstrip line groups with mutually orthogonal polarization directions, the microstrip line groups are not connected to each other, and the microstrip line group includes two microstrip lines that are not connected to each other; The microstrip lines are connected to the balun ground layer through corresponding feeding parts respectively.

2. The dual-frequency metamaterial dual-polarization radiation unit according to claim 1, characterized in that: The number of the geometric graphic pieces is at least four, gaps are left between the geometric graphic pieces, and the geometric graphic pieces include regular polygonal graphic pieces.

3. The dual-frequency metamaterial dual-polarization radiation unit according to claim 1, characterized in that: A radiation medium layer is provided between the radiation microstrip line layer and the metamaterial sheet layer, and the dielectric constant ε of the radiation medium layer is in the range of 1.5≤ε≤5.

4. The dual-frequency metamaterial dual-polarization radiation unit according to claim 1, characterized in that: The base circuit board and the dual-polarized radiating element are both provided with mounting holes corresponding to the feeding parts one by one, and the feeding parts are inserted into the mounting holes and fixedly connected.

5. The dual-frequency metamaterial dual-polarization radiation unit according to claim 1, characterized in that: The base circuit board comprises a base dielectric layer, a base microstrip circuit layer is arranged on the front side of the base dielectric layer, and a base grounding layer is arranged on the back side of the dielectric layer.

6. The dual-frequency metamaterial dual-polarization radiation unit according to claim 5, characterized in that: The dielectric constant ε of the balun dielectric layer and the base dielectric layer are both in the range of 1.5≤ε≤5.

7. An antenna, characterized in that: It comprises the dual-frequency metamaterial dual-polarization radiation unit as claimed in any one of claims 1 to 6.

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