Millimeter wave circularly polarized mobile terminal antenna based on metal frame

Abstract

The application provides a metal frame-based millimeter wave circular polarization mobile terminal antenna, which comprises a dielectric substrate integrated waveguide cavity, a double-layer metal frame, a feed line and a feed point; the dielectric substrate integrated waveguide cavity is provided with the double-layer metal frame above; the dielectric substrate integrated waveguide cavity comprises a dielectric layer, a metal column, a first metal patch and a second metal patch; the second metal patch and the double-layer metal frame are both provided with a cross-shaped slot; the application realizes circular polarization in a way different from traditional compensation phase, and circular polarization is realized through a coupling mode, so that the polarization method is low in cost and easy to realize; and the application can generate circular polarization through a simple way, the antenna works in a millimeter wave band, and the polarization is low in cost and easy to realize; after the upper metal frame is arranged, the axial ratio bandwidth of the antenna can be significantly improved.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and more specifically, to a millimeter-wave circularly polarized mobile terminal antenna based on a metal frame. Background Technology

[0002] With the rapid development of wireless communication technology, the performance of antennas has also been continuously improved with the advancement of the times.

[0003] Millimeter wave bands offer numerous advantages, such as abundant spectrum resources, high transmission rates, and low latency. They are particularly well-suited for high-speed, low-latency, and short-range communication applications, including telemedicine, smart factories, and VR / AR.

[0004] Furthermore, due to abundant frequency resources, millimeter-wave communication has developed rapidly in satellite communications. For example, the 5mm (60GHz) band is generally used for interplanetary communication because atmospheric attenuation is extremely high at this frequency, making it impossible for ground-based systems to intercept interplanetary communications. In interplanetary space, the extremely thin atmosphere prevents signal fading.

[0005] On the other hand, circularly polarized antennas have attracted widespread attention and in-depth research because circularly polarized waves can suppress multipath fading and are not affected by the Faraday rotation effect in the ionosphere. They are widely used in various military and civilian applications.

[0006] Currently, people usually use phase compensation to achieve circular polarization of antennas, but the phase compensation method is relatively complex and costly to implement. Therefore, how to achieve circular polarization using another method is an urgent problem to be solved. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide a millimeter-wave circularly polarized mobile terminal antenna based on a metal frame.

[0008] The present invention provides a millimeter-wave circularly polarized mobile terminal antenna based on a metal frame, comprising a dielectric substrate integrated waveguide cavity, a double-layer metal frame, a feed line, and a feed point; A double-layer metal frame is provided above the dielectric substrate integrated waveguide cavity; The dielectric substrate integrated waveguide cavity includes a dielectric layer, a metal pillar, a first metal patch, and a second metal patch; both the second metal patch and the double-layer metal frame are provided with cross-shaped slots. The dielectric layer includes an upper dielectric substrate, a lower dielectric substrate, and an intermediate dielectric substrate; the intermediate dielectric substrate has a three-dimensional structure with a hollow center. The first metal patch and the second metal patch are located on the lower surface and the upper surface of the dielectric layer, respectively; an upper space is provided between the upper dielectric plate and the second metal patch, a lower space is provided between the lower dielectric plate and the first metal patch, and a middle space is provided between the upper dielectric plate and the lower dielectric plate. The power supply point is located on the side of the upper dielectric substrate, and the feed line is located on the lower surface of the upper dielectric substrate; The metal pillar passes sequentially through the second metal patch, the upper dielectric plate, the middle dielectric plate, the lower dielectric plate, and the first metal patch.

[0009] Preferably, both the second metal patch and the double-layer metal frame are etched with cross-shaped slots that are deflected by 42°.

[0010] Preferably, the dimensions of both the upper and lower spaces are 6.8mm. 6.8mm 0.254mm; The middle layer space dimension is 6.8mm. 6.8mm 1mm, the size of the hollowed-out part in the middle is 5.6mm. 5.6mm 1mm.

[0011] Preferably, the metal column has a radius of 0.1 mm and a height of 1.508 mm; The number of metal pillars is multiple, and the multiple metal pillars are uniformly arranged along the circumference of the integrated waveguide cavity of the dielectric substrate.

[0012] Preferably, the double-layer metal frame includes an upper metal frame and a lower metal frame; the lower metal frame is in contact with the second metal patch; and a preset distance is provided between the upper metal frame and the lower metal frame. The upper and lower metal frames are provided with cross-shaped gaps of different sizes.

[0013] Preferably, the size of the first metal patch is 6.8mm. 6.8mm.

[0014] Preferably, the size of the second metal patch is 6.8mm. 6.8mm, the dimensions of the two sides of the cross-shaped gap are 0.56mm each. 5.76mm, 4.96mm 0.712mm.

[0015] Preferably, the feeder length is 4.3mm. 0.4mm; The feed point size is 0.4mm. 0.254mm.

[0016] Preferably, the lower metal frame has a size of 6.8mm. 6.8mm The cross-shaped gap has a diameter of 1mm, and the dimensions of the two sides are 0.56mm each. 5.76mm 1mm, 4.96mm 0.712mm 1mm, cross-shaped slit rotation angle is 42°; The upper metal frame has a diameter of 6.8mm. 6.8mm The cross-shaped gap is 1.2mm thick, and the dimensions of the two sides are 0.7mm each. 7.2mm 1.2mm, 6.2mm 0.89mm 1.2mm, cross-shaped slit rotation angle is 42°; The preset distance between the two metal frames is 1.1mm.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention achieves circular polarization differently from traditional phase compensation; instead, it uses a coupling method to achieve circular polarization, resulting in a low-cost and easily implemented polarization method. Furthermore, this invention generates circular polarization in a simple manner, allowing the antenna to operate in the millimeter-wave band. The addition of an upper metal frame also significantly improves the antenna's axial ratio bandwidth. Attached Figure Description

[0018] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A three-dimensional schematic diagram of a millimeter-wave circularly polarized mobile terminal antenna based on a metal frame, provided for the present invention; Figure 2 A top view (xoz) structural schematic diagram of a millimeter-wave circularly polarized mobile terminal antenna based on a metal frame provided by the present invention; Figure 3 A schematic diagram of a millimeter-wave circularly polarized mobile terminal antenna based on a metal frame applied to the short side structure of a mobile phone model, provided by the present invention; Figure 4 A schematic diagram of the S11 parameters of a millimeter-wave circularly polarized mobile terminal antenna unit based on a metal frame at 31.5GHz, provided by the present invention. Figure 5A schematic diagram of the axial ratio bandwidth of a millimeter-wave circularly polarized mobile terminal antenna unit based on a metal frame at 31.5 GHz, provided by the present invention. Figure 6 The present invention provides a three-dimensional radiation pattern of a millimeter-wave circularly polarized mobile terminal antenna based on a metal frame at 31.5 GHz.

[0019] The diagram shows: Detailed Implementation

[0020] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0021] This invention provides a millimeter-wave circularly polarized mobile terminal antenna based on a metal frame, such as... Figure 1-2 As shown, a spatial rectangular coordinate system o-xyz includes: origin o, x-axis, y-axis, and z-axis; the millimeter-wave circularly polarized mobile phone terminal antenna is parallel to the xoz plane of the spatial rectangular coordinate system; the millimeter-wave circularly polarized mobile phone terminal antenna based on a metal frame includes a dielectric substrate integrated waveguide (SIW) cavity, a double-layer metal frame 7, a feed line 5, and a feed point 6; a double-layer metal frame 7 is disposed above the dielectric substrate integrated waveguide cavity; the dielectric substrate integrated waveguide cavity includes a dielectric layer 1, a metal pillar 2, a first metal patch 3, and a second metal patch 4; both the second metal patch 4 and the double-layer metal frame 7 are provided with cross-shaped slots; the dielectric layer 1 includes an upper dielectric substrate, a lower dielectric substrate, and a middle dielectric substrate; the upper and lower dielectric substrates are solid dielectric substrates, and the middle dielectric substrate is a three-dimensional structure with a hollow center; the upper and lower solid dielectric substrates and the hollow middle dielectric substrate are stacked to form the main body of the SIW resonant cavity. In a preferred embodiment, the three-dimensional structure is a cuboid structure.

[0022] The substrate-integrated waveguide (SIW) cavity has metal patches of the same size as the cavity cross-section on its upper and lower surfaces, respectively. The first metal patch 3 and the second metal patch 4 are located on the lower and upper surfaces of the dielectric layer 1, respectively. An upper space is provided between the upper dielectric substrate and the second metal patch 4, a lower space is provided between the lower dielectric substrate and the first metal patch 3, and a middle space is provided between the upper and lower dielectric substrates. The feed point 6 is located on the side of the upper dielectric substrate, and the feed line 5 is located on the lower surface of the upper dielectric substrate. The metal pillar 2 passes through the second metal patch 4, the upper dielectric substrate, the middle dielectric substrate, the lower dielectric substrate, and the first metal patch 3 in sequence.

[0023] Both the second metal patch 4 and the double-layer metal frame 7 are etched with cross-shaped slots that are deflected by 42°.

[0024] The dimensions of both the upper and lower spaces are 6.8mm. 6.8mm 0.254mm; middle layer space dimension 6.8mm 6.8mm 1mm, the size of the hollowed-out part in the middle is 5.6mm. 5.6mm 1mm.

[0025] The metal column 2 has a radius of 0.1 mm and a height of 1.508 mm; The number of metal pillars 2 is plurality of, and the plurality of metal pillars are uniformly arranged along the circumference of the dielectric substrate integrated waveguide cavity. In a preferred embodiment, there are 34 metal pillars 2 in total. The double-layer metal frame 7 includes an upper metal frame 71 and a lower metal frame 72; the lower metal frame 72 is in contact with the second metal patch 4; a preset distance is provided between the upper metal frame 71 and the lower metal frame 72; cross-shaped gaps of different sizes are etched on the upper metal frame 71 and the lower metal frame 72.

[0026] The size of the first metal patch 3 is 6.8mm. 6.8mm. The second metal patch 4 has a size of 6.8mm. 6.8mm, the dimensions of the two sides of the cross-shaped gap are 0.56mm each. 5.76mm, 4.96mm 0.712mm.

[0027] The feeder 5 has a diameter of 4.3mm. 0.4mm; the size of feed point 6 is 0.4mm. 0.254mm.

[0028] The lower metal frame has a size of 6.8mm. 6.8mm The cross-shaped gap has a diameter of 1mm, and the dimensions of the two sides are 0.56mm each. 5.76mm 1mm, 4.96mm 0.712mm 1mm, cross-shaped gap rotation angle is 42°; upper metal frame 71 dimension is 6.8mm. 6.8mm The cross-shaped gap is 1.2mm thick, and the dimensions of the two sides are 0.7mm each. 7.2mm 1.2mm, 6.2mm 0.89mm 1.2mm, cross gap rotation angle is 42°; preset distance between the two metal frames is 1.1mm.

[0029] refer to Figure 3 The millimeter-wave circularly polarized mobile terminal antenna based on a metal frame can be installed on the short side of the mobile phone.

[0030] Tests showed that its gain and polarization effects were quite good. Figure 4 This is a schematic diagram of the S11 parameters of the antenna element at 31.5 GHz; Figure 5 This is a schematic diagram of the axial ratio bandwidth of the antenna element at 31.5 GHz; Figure 6 This is a three-dimensional radiation pattern of the antenna at 31.5 GHz.

[0031] This invention achieves circular polarization differently from traditional phase compensation; instead, it uses a coupling method, resulting in a low-cost and easily implemented polarization method. This invention generates circular polarization in a simple way, allowing the antenna to operate in the millimeter-wave band. The addition of a metal frame with etched cross-shaped slots significantly improves the antenna's axial ratio bandwidth, demonstrating high innovation. Furthermore, the proposed double-layer metal frame significantly enhances the antenna's axial ratio bandwidth, is simple in structure, easy to manufacture, effectively utilizes space, and delivers excellent results. In summary, this invention studies a simpler millimeter-wave circularly polarized mobile terminal antenna suitable for mobile devices. A search of existing patent literature reveals that all existing patents represent different inventive concepts from the method described in this invention.

[0032] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A millimeter-wave circularly polarized mobile terminal antenna based on a metal frame, characterized in that, It includes a dielectric substrate integrated waveguide cavity, a double-layer metal frame (7), a feed line (5), and a feed point (6); A double-layer metal frame (7) is provided above the dielectric substrate integrated waveguide cavity; The dielectric substrate integrated waveguide cavity includes a dielectric layer (1), a metal pillar (2), a first metal patch (3), and a second metal patch (4); both the second metal patch (4) and the double-layer metal frame (7) are provided with cross-shaped slots; The dielectric layer (1) includes an upper dielectric plate, a lower dielectric plate, and an intermediate dielectric plate; the intermediate dielectric plate is a three-dimensional structure with a hollow center. The first metal patch (3) and the second metal patch (4) are located on the lower surface and the upper surface of the dielectric layer (1), respectively; an upper space is provided between the upper dielectric plate and the second metal patch (4), a lower space is provided between the lower dielectric plate and the first metal patch (3), and a middle space is provided between the upper dielectric plate and the lower dielectric plate. The feed point (6) is located on the side of the upper dielectric substrate, and the feed line (5) is located on the lower surface of the upper dielectric substrate; The metal pillar (2) passes through the second metal patch (4), the upper dielectric plate, the middle dielectric plate, the lower dielectric plate and the first metal patch (3) in sequence. The double-layer metal frame (7) includes an upper metal frame (71) and a lower metal frame (72); the lower metal frame (72) is in contact with the second metal patch (4); a preset distance is provided between the upper metal frame (71) and the lower metal frame (72); The upper metal frame (71) and the lower metal frame (72) are provided with cross-shaped gaps of different sizes.

2. The millimeter-wave circularly polarized mobile terminal antenna based on a metal frame according to claim 1, characterized in that, Both the second metal patch (4) and the double-layer metal frame (7) are etched with cross-shaped slots that are deflected by 42°.

3. The millimeter-wave circularly polarized mobile terminal antenna based on a metal frame according to claim 1, characterized in that, The dimensions of both the upper and lower spaces are 6.8mm. 6.8mm 0.254mm; The middle layer space dimension is 6.8mm. 6.8mm 1mm, the size of the hollowed-out part in the middle is 5.6mm. 5.6mm 1mm.

4. The millimeter-wave circularly polarized mobile terminal antenna based on a metal frame according to claim 1, characterized in that, The metal column (2) has a radius of 0.1 mm and a height of 1.508 mm; The number of metal pillars (2) is multiple, and the multiple metal pillars are uniformly arranged along the circumference of the integrated waveguide cavity of the dielectric substrate.

5. The millimeter-wave circularly polarized mobile terminal antenna based on a metal frame according to claim 1, characterized in that, The size of the first metal patch (3) is 6.8mm. 6.8mm.

6. The millimeter-wave circularly polarized mobile terminal antenna based on a metal frame according to claim 1, characterized in that, The second metal patch (4) has a size of 6.8mm. The dimensions of the two slits in the cross-shaped seam are 6.8mm and 0.56mm respectively. 5.76mm, 4.96mm 0.712mm.

7. The millimeter-wave circularly polarized mobile terminal antenna based on a metal frame according to claim 1, characterized in that, The feeder (5) has a size of 4.3mm. 0.4mm; The size of the feed point (6) is 0.4 mm. 0.254mm.

8. The millimeter-wave circularly polarized mobile terminal antenna based on a metal frame according to claim 1, characterized in that, The lower metal frame (72) has a size of 6.8mm. 6.8mm The dimensions of the two slits in the cross-shaped seam are 0.56mm each. 5.76mm 1mm, 4.96mm 0.712mm 1mm, cross-shaped slit rotation angle is 42°; The upper metal frame (71) has a size of 6.8mm. 6.8mm The dimensions of the two slits in the cross-shaped seam are 1.2mm and 0.7mm respectively. 7.2mm 1.2mm, 6.2mm 0.89mm 1.2mm, cross-shaped slit rotation angle is 42°; The preset distance between the two metal frames is 1.1mm.

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