A miniaturized stacked antenna based on artificial surface plasmonic structures

Abstract

The application provides a miniaturized laminated antenna based on artificial surface plasmon structure, comprising a first dielectric plate, a second dielectric plate, a first metal patch, a second metal patch, a metal ground and a feeding structure for feeding the laminated antenna, the first metal patch is arranged on the upper surface of the first dielectric plate, the second metal patch is arranged on the upper surface of the second dielectric plate, the metal ground is arranged on the lower surface of the second dielectric plate, the first metal patch and the second metal patch are both radiation units, and the non-radiation edges of the first metal patch and the second metal patch are both provided with artificial surface plasmon structure. The application realizes the miniaturized design of the laminated antenna, and significantly reduces the geometric size of the antenna while ensuring the wideband characteristics of the antenna.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laminated antenna, in particular to a miniaturized laminated antenna based on artificial surface plasmon structure. BACKGROUND

[0002] As one of the most important components of wireless communication system, antenna carries the task of radio wave transmission and reception. Laminated antenna, on the basis of inheriting the advantages of traditional microstrip antenna such as small size, light weight, simple manufacturing and easy integration, also has wide beam width, wide impedance bandwidth, filtering characteristics and polarization flexibility. Therefore, laminated antenna has been widely used in wireless communication system terminal and mobile client device. With the rapid development and application of mobile communication technology and wireless radio frequency identification technology, terminal device gradually develops towards miniaturization and integration, and the requirement for antenna size is higher and higher. Therefore, how to realize the miniaturization of laminated antenna in limited space is one of the problems to be solved in the current wireless communication system.

[0003] The essence of realizing antenna miniaturization is to extend the current path and thus reduce the resonant frequency. The existing miniaturization technology of patch antenna mainly includes using dielectric plate with high dielectric constant, loading short-circuit patch, loading simple slot, using defective ground and using concave-convex substrate. However, these methods will sacrifice the radiation characteristics of the antenna or increase the manufacturing cost. For example: using dielectric plate with high dielectric constant will cause surface wave and thus reduce the radiation efficiency; using defective ground structure will increase backward radiation and thus reduce the antenna gain. Therefore, in order to balance the space utilization rate, process manufacturing cost and antenna radiation performance, it is particularly important to realize miniaturization while retaining the wideband characteristics of laminated antenna in the antenna design of wireless communication system. SUMMARY

[0004] In view of the defects in the prior art, the purpose of the present application is to provide a miniaturized laminated antenna based on artificial surface plasmon structure, which realizes the miniaturization of antenna structure by introducing artificial surface plasmon structure into the laminated antenna.

[0005] To solve the above problems, the technical scheme of the present application is as follows:

[0006] A miniaturized laminated antenna based on artificial surface plasmon structure, comprising a first dielectric plate, a second dielectric plate, a first metal patch, a second metal patch, a metal ground and a feeding structure for feeding the laminated antenna, the first metal patch is arranged on the upper surface of the first dielectric plate, the second metal patch is arranged on the upper surface of the second dielectric plate, the metal ground is arranged on the lower surface of the second dielectric plate, the first metal patch and the second metal patch are both radiation units, and the non-radiation edges of the first metal patch and the second metal patch are both provided with artificial surface plasmon structure.

[0007] Preferably, the artificial surface plasmon structure of the non-radiation edge of the first metal patch comprises a plurality of grooves, the depth of the grooves gradually changes in an exponential curve, wherein the curve shape is determined by the actual high-frequency resonance point of the stacked antenna.

[0008] Preferably, the widths of the plurality of grooves of the artificial surface plasmon structure of the first metal patch are the same.

[0009] Preferably, the artificial surface plasmon structure of the non-radiation edge of the second metal patch comprises a plurality of grooves, the depth of the grooves gradually changes in an exponential curve, wherein the curve shape is determined by the actual low-frequency resonance point of the stacked antenna.

[0010] Preferably, the widths of the plurality of grooves of the artificial surface plasmon structure of the second metal patch are the same.

[0011] Preferably, the feeding structure comprises a feeding point arranged on the second metal patch, a metal via arranged in the second dielectric plate, and a feeding interface arranged on the metal ground, the feeding interface feeds the second metal patch through the metal via in the second dielectric plate.

[0012] Preferably, the feeding point on the second metal patch is offset from the center point of the second metal patch.

[0013] Preferably, the second metal patch is used to couple electromagnetic energy to the first metal patch and at the same time radiate into space.

[0014] Preferably, the first metal patch radiates the coupled electromagnetic energy into space.

[0015] Preferably, the first dielectric plate and the second dielectric plate are different high-frequency printed circuit boards.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1. The miniaturized stacked antenna of the present application is based on artificial surface plasmon mode, and a structure with groove depth gradually changing in an exponential curve is loaded on the non-radiation edge of the metal patch, thereby realizing miniaturization of the stacked antenna and significantly reducing the geometric size of the antenna.

[0018] 2. The miniaturized stacked antenna structure based on artificial surface plasmon structure of the present application is compact, the principle is easy to understand, easy to manufacture and has strong replicability.

[0019] 3. The present application significantly reduces the size of the metal patch while retaining the wideband characteristics of the stacked antenna, and can simultaneously meet the requirements of miniaturization and wideband, and can be widely applied to the radio frequency front end of the wireless communication system. BRIEF DESCRIPTION OF DRAWINGS

[0020] Other features, objects, and advantages of the application will become more apparent from the following detailed description when read in connection with the following drawings:

[0021] Figure 1 A schematic diagram of a small-sized stacked antenna structure based on artificial surface plasmon structure is provided for an embodiment of the application;

[0022] Figure 2 A schematic diagram of a first metal patch structure is provided for an embodiment of the application;

[0023] Figure 3 A schematic diagram of a second metal patch structure is provided for an embodiment of the application;

[0024] Figure 4 A reflection coefficient curve of the small-sized stacked antenna is provided for an embodiment of the application;

[0025] Figure 5 An E-plane radiation pattern of the small-sized stacked antenna is provided for an embodiment of the application;

[0026] Figure 6 An H-plane radiation pattern of the small-sized stacked antenna is provided for an embodiment of the application. DETAILED DESCRIPTION

[0027] The application will be described in detail below with specific embodiments. The following embodiments will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be noted that for those skilled in the art, without departing from the concept of the application, a number of changes and improvements can be made. These are within the scope of the application.

[0028] Figure 1 A schematic diagram of a small-sized stacked antenna structure based on artificial surface plasmon structure is provided for an embodiment of the application, Figure 2 A schematic diagram of a first metal patch structure is provided for an embodiment of the application; Figure 3 A schematic diagram of a second metal patch structure is provided for an embodiment of the application, such as Figure 1 , Figure 2 and Figure 3As shown, the small-sized artificial surface plasmon structure-based stacked antenna comprises a first dielectric plate 1, a second metal patch 2, a second dielectric plate 3, a metal ground 4, a first metal patch 5, and a feeding structure, wherein the feeding structure comprises a feeding point 6 arranged on the second metal patch 2, a metal via 7 arranged in the second dielectric plate 3, and a feeding interface 8 arranged on the metal ground 4. The first metal patch 5 is arranged on the upper surface of the first dielectric plate 1, and the second metal patch 2 is arranged on the upper surface of the second dielectric plate 3. The metal ground 4 is arranged on the lower surface of the second dielectric plate 3, and the feeding interface 8 arranged on the metal ground 4 feeds the second metal patch 2 through the metal via 7 in the second dielectric plate 3. The first metal patch 5 and the second metal patch 2 are both radiation units, and the non-radiation edges thereof are provided with artificial surface plasmon structures to realize the miniaturization of the antenna.

[0029] In the embodiment, the first dielectric plate 1, the second metal patch 2, the second dielectric plate 3, the metal ground 4, the first metal patch 5, the feeding point 6, the metal via 7, and the feeding interface 8 are all realized by PCB process. The first dielectric plate 1 and the second dielectric plate 3 are different high-frequency printed circuit boards, which can be selected according to the actual working frequency. Specifically, the first dielectric plate 1 is a Rogers RT / duroid 5880 dielectric plate with a dielectric constant of 2.2, a loss tangent of 0.0009, and a geometric size of 18 mm x 18 mm x 1.575 mm. The second dielectric plate 3 is a Rogers RO4350 dielectric plate with a dielectric constant of 3.66, a loss tangent of 0.004, and a geometric size of 18 mm x 18 mm x 1.524 mm.

[0030] The geometric size of the metal ground 4 is 18 mm x 18 mm x 0.018 mm.

[0031] The length of the non-radiation edge of the first metal patch 5 is determined by the actual working frequency, and the artificial surface plasmon structure with the groove depth gradually changing in an exponential curve manner is symmetrically arranged on the non-radiation edge of the first metal patch 5. The curve shape is determined by the actual high-frequency resonance point of the stacked antenna. In the embodiment, the overall size of the first metal patch 5 is 4.6 mm x 4.6 mm x 0.018 mm, and the artificial surface plasmon structure is loaded on the non-radiation edge thereof. The groove depth gradually changes in an exponential curve manner, and the exponential function expression is y = 0.2e x +0.24, the groove width is 0.2 mm, and the maximum groove depth is 0.95 mm.

[0032] The non-radiation edge length of the second metal patch 2 is determined by the actual working frequency, and the artificial surface plasmon structure with groove depth gradually changing in another exponential curve manner is symmetrically arranged on the non-radiation edge of the second metal patch 2, and the curve shape is determined by the actual low-frequency resonance point of the stacked antenna. In the embodiment, the overall size of the second metal patch 2 is 4.6mmx4.6mmx0.018mm, the artificial surface plasmon structure is loaded on the non-radiation edge of the second metal patch 2, the groove depth gradually changes in an exponential curve, the expression of the exponential function is y=0.15e x +0.8, the groove width is 0.2mm, and the maximum groove depth is 0.45mm.

[0033] The feeding point 6 on the second metal patch 2 is offset from the center point of the metal patch by a certain distance to realize impedance matching of the antenna. Specifically, in the embodiment, the feeding point 6 is offset from the center point of the second metal patch 2 by 1.45mm. The second metal patch 2 is used to couple electromagnetic energy to the first metal patch 5, and at the same time, radiate into space, and the first metal patch 5 radiates the coupled electromagnetic energy into space. The feeding interface 8 feeds the second metal patch 2 through the metal via hole 7 in the second dielectric plate 3, and in the implementation process, a suitable radio frequency adapter can be selected and connected to the feeding interface 8 according to the actual working frequency.

[0034] Figure 4 The reflection coefficient curve of the small-sized stacked antenna provided by the embodiment of the present application has a-10dB impedance bandwidth of 1.9GHz, and a relative bandwidth of 16.4%. Figure 5 The E-plane radiation pattern of the small-sized stacked antenna provided by the embodiment of the present application has a 3dB main lobe beam width of 84°. Figure 6 The H-plane radiation pattern of the small-sized stacked antenna provided by the embodiment of the present application has a 3dB main lobe beam width of 87°.

[0035] In the description of the application, it needs to be explained that the terms "upper", "lower" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In the description of the application, it also needs to be explained that, unless otherwise specified and limited, the terms "provided", "connected" and the like should be understood broadly, for example, "connected" can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances. In this paper, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, in addition to containing the listed elements, but also containing other elements not explicitly listed.

[0036] The specific embodiments of the application are described above. It needs to be understood that the application is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essential content of the application. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict.

Claims

1. A miniaturized stacked antenna based on an artificial surface plasmon structure, characterized in that: The miniaturized stacked antenna based on the artificial surface plasmon structure includes a first dielectric plate, a second dielectric plate, a first metal patch, a second metal patch, a metal ground, and a feeding structure for feeding the stacked antenna. The first metal patch is arranged on the upper surface of the first dielectric plate, the second metal patch is arranged on the upper surface of the second dielectric plate, and the metal ground is arranged on the lower surface of the second dielectric plate. The first metal patch and the second metal patch are both radiation units. The non-radiating edges of the first metal patch and the second metal patch are both provided with artificial surface plasmon structures. The artificial surface plasmon structure on the non-radiating edge of the first metal patch includes multiple grooves, the depth of the grooves gradually changes in the manner of an exponential curve, wherein the shape of the curve is determined by the actual high-frequency resonance point of the stacked antenna; the artificial surface plasmon structure on the non-radiating edge of the second metal patch includes multiple grooves, the depth of the grooves gradually changes in the manner of an exponential curve, wherein the shape of the curve is determined by the actual low-frequency resonance point of the stacked antenna.

2. The miniaturized stacked antenna based on an artificial surface plasmon structure according to claim 1, characterized in that: The widths of the multiple grooves of the artificial surface plasmon structure of the first metal patch are the same.

3. The miniaturized stacked antenna based on artificial surface plasmon structure according to claim 1, characterized in that: The widths of the multiple grooves of the artificial surface plasmon structure of the second metal patch are the same.

4. The miniaturized stacked antenna based on an artificial surface plasmon structure according to claim 1, wherein: The feeding structure includes a feeding point arranged on the second metal patch, a metal via arranged in the second dielectric plate, and a feeding interface arranged on the metal ground. The feeding interface feeds the second metal patch through the metal via in the second dielectric plate.

5. The miniaturized stacked antenna based on artificial surface plasmon structure according to claim 4, characterized in that: The feeding point on the second metal patch deviates from the center point of the second metal patch.

6. The miniaturized stacked antenna based on artificial surface plasmon structure according to claim 1, characterized in that: The second metal patch is used to couple electromagnetic energy to the first metal patch and radiate it into space at the same time.

7. The miniaturized stacked antenna based on artificial surface plasmon structure according to claim 6, characterized in that: The first metal patch radiates the coupled electromagnetic energy into space.

8. The miniaturized stacked antenna based on an artificial surface plasmon structure according to claim 1, wherein: The first dielectric plate and the second dielectric plate are different high-frequency printed circuit boards.

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