Bidirectional radiation array antenna based on SISL

Abstract

The invention discloses an SISL-based bidirectional radiation array antenna, which utilizes a multi-layer structure of an SISL transmission line and has the characteristics that the upper layer and the lower layer are symmetrical, and utilizes a middle layer feed structure to simultaneously excite upper and lower layer radiation structures to realize bidirectional radiation. Wherein the bidirectional radiation array antenna comprises an S1 layer, an S2 layer, an S3 layer and an S7 layer, and the S1 layer and the S7 layer are isolation structures of a radiation structure of an array and are used for suppressing mutual coupling between array elements; the S2 layer and the S6 layer are radiation structures of the array; the S3 layer and the S5 layer are cavity structures of the array feed network, and the S4 layer is an array. Based on the scheme, the high-gain bidirectional radiation array antenna is realized by utilizing the SISL structure. Front and back bidirectional radiation can be realized under the condition that a layer of feed network is used, the maximum gain can reach 24.2 dBi in the working bandwidth range of 22-32GHz, and meanwhile, the maximum radiation efficiency of the array can reach 78%.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna structures, and in particular to a bidirectional radiation array antenna based on SISL. Background Art

[0002] Traditional bidirectional radiating antenna arrays often require two antenna arrays to be integrated back to back, which is equivalent to two antenna arrays. 5G millimeter wave technology is developing rapidly in the world today, and will play an important role in the construction of smart cities in the future, especially in underground smart transportation, which has higher requirements for millimeter wave technology. In narrow and long tunnels, high-gain antenna arrays are often required to provide good signal transmission and transmission for communication equipment. High-gain bidirectional radiating antenna arrays can not only serve as the transmitting terminal of communication equipment in the tunnel, but also can use the bidirectional characteristics to realize the simultaneous reception and transmission, which improves the utilization rate of the antenna array and saves costs. Summary of the invention

[0003] Based on the above requirements, the purpose of the present invention is to provide a bidirectional radiation array antenna based on substrate integrated suspended line (SISL). The SISL low-loss structure is used to load radiation structures on the top and bottom layers respectively, and the middle layer feeding network is used to simultaneously excite the upper and lower layer radiation structures to achieve bidirectional radiation.

[0004] To achieve the above purpose, the technical solution provided by the present invention is as follows:

[0005] A bidirectional radiation array antenna based on SISL utilizes the multi-layer structure of SISL transmission lines and has the characteristics of symmetry between the upper and lower layers. The middle layer feeding structure is utilized to simultaneously excite the upper and lower layer radiation structures to realize bidirectional radiation.

[0006] The bidirectional radiation array antenna includes S1-S7 layers, wherein the S1 layer and the S7 layer are isolation structures of the radiation structure of the array, which are used to suppress the mutual coupling between the array elements; the S2 layer and the S6 layer are the radiation structure of the array; the S3 and S5 layers are the cavity structures of the array feeding network, and the S4 layer is the feeding network structure of the array antenna. After the excitation signal is fed into the feeding network, the top and bottom radiation structures in the array antenna are respectively excited to realize bidirectional radiation.

[0007] The S1 and S2 layers are loaded on top of the radiation structure to suppress coupling between array antenna elements and thereby improve array gain.

[0008] Among them, the array radiation structure is composed of 64 array element radiation structures, and the array element radiation structure is composed of the upper and lower metals of the S2 layer. The upper metal structure consists of 12 small square patches and rectangular patches on both sides. The square patches are connected to the lower metal through metallized through holes. The bottom metal of each array element corresponds to two rectangular gaps, and the metallized through holes are on the upper and lower sides of the rectangular gaps.

[0009] Among them, in the S3 and S5 layers, each small cavity corresponds to an array element.

[0010] Among them, the S4 layer is composed of a 1-to-64 feeding network and a unit feeding structure. The unit feeding is formed by loading trapezoidal branches on two main transmission lines. The upper and lower metal structures of the S4 layer feeding structure are the same structure, and the upper and lower metal layers are connected through metallized through holes.

[0011] Wherein, the feeding network of the array adopts a T-type power division network.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] Based on the above scheme, it can be known that the present invention realizes a high-gain bidirectional radiation array antenna using the SISL structure. It can realize front and back bidirectional radiation when using a layer of feeding network, and its maximum gain can reach 24.2dBi in the working bandwidth range of 22-32GHz, and the maximum radiation efficiency of the array can reach 78%. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of a SISL bidirectional radiation array antenna proposed in an embodiment of the present application;

[0015] Figure 2 is a schematic diagram of the isolation structure of the bidirectional radiation array proposed in the embodiment of the present application;

[0016] Figure 3 is a schematic diagram of the radiation structure of the bidirectional radiation array proposed in the embodiment of the present application;

[0017] Figure 4 is a schematic diagram of the cavity structure of the bidirectional radiation array proposed in the embodiment of the present application;

[0018] Figure 5 Schematic diagram of the feeding network structure of the bidirectional radiating array proposed in the embodiment of the present application;

[0019] Figure 6 is a schematic diagram of the working bandwidth of the bidirectional radiation array proposed in the embodiment of the present application;

[0020] Figure 7 Schematic diagram of forward and backward beam gain and array radiation efficiency of the bidirectional radiation array proposed in the embodiment of the present application;

[0021] Figure 8 is the xoz surface radiation pattern of the bidirectional radiation array proposed in the embodiment of the present application;

[0022] Fig. 9 It is the yoz surface radiation pattern of the bidirectional radiation array proposed in the embodiment of the present application. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected, set, or detachably connected, set, or integrally connected, set, and can refer to direct connection or indirect connection. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0026] See also Figure 1-Figure 9 The structure of the embodiment provided by the present invention is shown in FIG.

[0027] The present application is based on a substrate integrated suspended line (SISL) structure, and utilizes its low-loss characteristics and symmetrical structure to realize a layer of feeding network to simultaneously excite the upper and lower radiation structures to achieve high-gain bidirectional radiation.

[0028] Specifically, the present application includes S1-S7 layers, wherein S1 and S7 layers are isolation structures of the radiation structure of the array, used to suppress mutual coupling between array elements. S2 and S6 layers are the radiation structure of the array. S3 and S5 layers are the cavity structure of the array feed network, and S4 layer is the feed network structure of the array antenna. After the excitation signal is fed into the feed network, the radiation structures of the top layer and the bottom layer in the array antenna are respectively excited to realize bidirectional radiation.

[0029] In the present application, the dielectric substrate material of the S1 layer, S2 layer, S3 layer, S5 layer, S6 layer, and S7 layer is FR4, and the dielectric substrate material of S5 is Rogers 4350B. The antenna array is composed of a total of 7 layers of dielectric substrate. The S1 and S2 layers are bidirectional radiation array isolation structures, which are loaded on top of the radiation structure, and can suppress the coupling between the array antenna elements and thus improve the array gain. The S2 and S6 layers are radiation structures. The array radiation structure is mainly composed of 64 array element radiation structures. The array element radiation structure is mainly composed of the upper and lower metals of the S2 layer. The upper metal metal structure S2_1 is mainly composed of 12 small square patches and rectangular patches on both sides. The square patches are connected to the lower metal S2_2 through metallized through holes. The bottom metal of each array element corresponds to two rectangular gaps, and the metallized through holes are on the upper and lower sides of the rectangular gaps. The S3 and S5 layer structures are cavity structures of the feed network structure, and each small cavity corresponds to an array element. The feeding network structure of the S4 layer array antenna is mainly composed of the 1-to-64 feeding network of S4_1 and the unit feeding structure of S4_2. The unit feeding is mainly formed by loading trapezoidal branches through two main transmission lines. In order to achieve the excitation of the upper and lower radiation structures, the upper and lower metal structures of the S4 layer feeding structure are the same structure, and the upper and lower metal layers are connected through metallized through holes. S4_1 is the feeding network of the array, which adopts a T-type power division network. Other types of feeding networks can also be used, such as the Wilkinson power division network.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A bidirectional radiation array antenna based on SISL, characterized in that: The SISL transmission line multi-layer structure has the characteristics of symmetry between the upper and lower layers, and the middle layer feeding structure is used to simultaneously excite the upper and lower layer radiation structures to achieve bidirectional radiation.

2. A bidirectional radiation array antenna based on SISL according to claim 1, characterized in that: The bidirectional radiation array antenna includes S1-S7 layers, wherein the S1 layer and the S7 layer are isolation structures of the radiation structure of the array, which are used to suppress the mutual coupling between the array elements; the S2 layer and the S6 layer are the radiation structure of the array; the S3 and S5 layers are the cavity structures of the array feeding network, and the S4 layer is the feeding network structure of the array antenna. After the excitation signal is fed into the feeding network, the top and bottom radiation structures in the array antenna are respectively excited to realize bidirectional radiation.

3. The bidirectional radiation array antenna based on SISL according to claim 1, characterized in that: The S1 and S2 layers are loaded on the top of the radiation structure to suppress the coupling between the array antenna elements and thus improve the array gain.

4. The bidirectional radiation array antenna based on SISL according to claim 3, characterized in that: The array radiation structure consists of 64 array element radiation structures. The array element radiation structure consists of the upper and lower metals of the S2 layer. The upper metal structure consists of 12 small square patches and rectangular patches on both sides. The square patches are connected to the lower metal through metallized through holes. The bottom metal of each array element corresponds to two rectangular gaps, and the metallized through holes are on the upper and lower sides of the rectangular gaps.

5. The bidirectional radiation array antenna based on SISL according to claim 4, characterized in that: In the S3 and S5 layers, each small cavity corresponds to an array element.

6. The bidirectional radiation array antenna based on SISL according to claim 5, characterized in that: The S4 layer is composed of a 1:64 feeding network and a unit feeding structure. The unit feeding is formed by loading trapezoidal branches on two main transmission lines. The upper and lower metal structures of the S4 layer feeding structure are the same, and the upper and lower metal layers are connected through metallized through holes.

7. The bidirectional radiation array antenna based on SISL according to claim 6, characterized in that: The feeding network of the array adopts a T-type power division network.

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