An ultra-wideband slot antenna array

Abstract

The application discloses a kind of super wideband butterfly antenna arrays, comprising: dielectric substrate, metal reflector, short-circuit column and coaxial cable outer conductor;The dielectric substrate is connected with metal reflector by short-circuit column;The lower surface of the dielectric substrate is copper-clad surface, and the copper-clad surface is connected with metal reflector by coaxial cable outer conductor;The central position of the upper surface of the dielectric substrate is equipped with the metal patch of gradually changing structure, and the metal patch of gradually changing structure is equipped with two groups of butterfly slot antennas on both sides, and two groups of butterfly slot antennas are located on the copper-clad surface;The upper surface of the dielectric substrate is also equipped with two groups of rectangular metal patches, and two groups of rectangular metal patches are respectively located in the middle of two groups of butterfly slot antennas;The copper-clad surface is also equipped with rectangular slot in the middle, and rectangular slot is orthogonal with the metal patch of gradually changing structure;Coaxial cable inner conductor is arranged in the coaxial cable outer conductor;The application can realize more than 500MHz absolute bandwidth meeting the requirement of super wideband antenna by gap multiple coupling, without complex array feeding structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radio communication, in particular to a kind of butterfly antenna array of ultra-wideband. BACKGROUND

[0002] In recent years, ultra-wideband technology has been favored by many researchers and engineers for its wide bandwidth, high data transmission rate, low power consumption and the ability to avoid multipath interference. The basic feature of ultra-wideband wireless communication is that it needs to occupy a wider bandwidth compared with traditional wireless communication due to the use of pulse signals. In terms of effectively achieving high-speed wireless data transmission and long-distance positioning functions, ultra-wideband technology is very suitable, and as the main component of wireless communication, such ultra-wideband system puts forward unique requirements and challenges to the design of antenna. SUMMARY

[0003] The purpose of the present application is to provide a butterfly antenna array of ultra-wideband, which can achieve an absolute bandwidth greater than 500MHz conforming to the requirements of ultra-wideband antenna without complex array feeding structure.

[0004] Technical scheme: The ultra-wideband butterfly antenna array comprises a dielectric substrate, a metal reflector, a short-circuit column and a coaxial cable outer conductor; the dielectric substrate is connected to the metal reflector through the short-circuit column; the lower surface of the dielectric substrate is a copper-clad surface, which is connected to the metal reflector through the coaxial cable outer conductor; a metal patch with a gradient structure is provided at the central position of the upper surface of the dielectric substrate, and two groups of butterfly slot antennas are provided on both sides of the metal patch with a gradient structure, which are located on the copper-clad surface; two groups of rectangular metal patches are further provided on the upper surface of the dielectric substrate, and each group of rectangular metal patches is located in the middle of a group of butterfly slot antennas; a rectangular slot is further provided in the middle of the copper-clad surface, and the rectangular slot is orthogonal to the metal patch with a gradient structure; a coaxial cable inner conductor is provided inside the coaxial cable outer conductor; the coaxial cable inner conductor is in a via structure and penetrates through the dielectric substrate, and the top is connected to the metal patch with a gradient structure.

[0005] Further, the distance between the two groups of butterfly slot antennas (8) is 45-55mm horizontally and 15-20mm vertically.

[0006] Further, each group of butterfly slot (8) antennas is composed of 4 evenly distributed butterfly antennas.

[0007] Further, the distance between the two butterfly antennas is 1.8-2.0mm, and the slot width at the triangular vertex of each butterfly antenna is 0.01-0.03mm.

[0008] Further, each group of butterfly antennas has a length of 40-45mm and a width of 10-12mm.

[0009] Further, the metal patch shape of the gradual change structure is a trapezoidal structure, wherein the upper base is 1.0-1.2mm, the lower base is 2.0-2.4mm, and the height is 30-32mm.

[0010] Further, the length of the rectangular metal patch is 15-20mm, and the width is 2-2.5mm.

[0011] Further, the length of the rectangular slot is 80-82mm, and the width is 0.2-0.3mm.

[0012] Further, the medium substrate is an FR4 medium plate, wherein the length is 100-120mm, the width is 85-90mm, and the thickness is 0.8-1.6mm.

[0013] Further, the butterfly-shaped antenna array adopts a coaxial feeding structure.

[0014] Beneficial effects: Compared with the prior art, the present application has the following remarkable advantages: through multiple coupling of the slot, an absolute bandwidth greater than 500MHz conforming to the requirements of an ultra-wideband antenna can be realized, without a complex array feeding structure. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram of the present application;

[0016] Figure 2 is a top view of the present application;

[0017] Figure 3 is a front view of the present application;

[0018] Figure 4 is a detail view of the feeding part of the present application;

[0019] Figure 5 is a detail view of the coupling rectangular slot part of the present application;

[0020] Figure 6 is an S11 parameter diagram of the present application under different slot widths S1;

[0021] Figure 7 is an S11 parameter diagram of the present application under different slot lengths S2;

[0022] Figure 8 is an S11 parameter diagram of the feeding of the present application at different distances S3 from the center of the antenna array;

[0023] Figure 9 is an E-plane gain pattern of the antenna array of the present application;

[0024] Figure 10 is an H-plane gain pattern of the antenna array of the present application. DETAILED DESCRIPTION

[0025] The technical solutions of the present application are further described below with reference to the accompanying drawings.

[0026] As Figures 1-5 shown in the drawings, the butterfly-shaped antenna array of the present application comprises a dielectric substrate 2, a metal reflector plate 3, a short-circuit column 4 and a coaxial cable outer conductor 5; the dielectric substrate 2 is connected with the metal reflector plate 3 through the short-circuit column 4; the lower surface of the dielectric substrate 2 is a copper-clad surface 6, which is connected with the metal reflector plate 3 through the coaxial cable outer conductor 5; the central position of the upper surface of the dielectric substrate 2 is provided with a metal patch 7 with a gradient structure, both sides of the metal patch 7 with a gradient structure are provided with two groups of butterfly-shaped slot antennas 8, and the two groups of butterfly-shaped slot antennas 8 are located on the copper-clad surface 6; the upper surface of the dielectric substrate 2 is further provided with two groups of rectangular metal patches 9, and the two groups of rectangular metal patches 9 are respectively located in the middle of the two groups of butterfly-shaped slot antennas 8; the copper-clad surface 6 is further provided with a rectangular slot 1, and the rectangular slot 1 is orthogonal to the metal patch 7 with a gradient structure; the inside of the coaxial cable outer conductor 5 is provided with a coaxial cable inner conductor 10; the coaxial cable inner conductor 10 is a via structure, penetrates through the dielectric substrate 2, and is connected with the metal patch 7 with a gradient structure at the top.

[0027] The length of each group of butterfly-shaped antennas at both ends is 43 mm, and the width is 10.75 mm; the distance between the triangular vertices of each two butterfly-shaped antennas is 1.9 mm; the slot width at the triangular vertex of each butterfly-shaped antenna is 0.02 mm; the metal patch with a gradient structure is in a trapezoidal structure, wherein the upper base is 1.1 mm, the lower base is 2.2 mm, and the height is 31.5 mm; the length of the rectangular metal patch is 15 mm, and the width is 2.25 mm; the length of the rectangular slot is 80 mm, and the width is 0.2 mm. The dielectric substrate is an FR4 dielectric plate, wherein the length is 100 mm, the width is 86 mm, and the thickness is 1.6 mm; the butterfly-shaped antenna array adopts a coaxial feeding structure, and the specific parameters of the butterfly-shaped antenna array are shown in Table 1.

[0028] Table 1: Specific dimensions of the ultra-wideband antenna array (unit: mm)

[0029] L1 W1 L2 W2 S1 S2 S3 L3 W3 100 86 43 10.75 0.25 81 13.5 15 2.25 S4 D1 D2 D3 D5 R1 R2 H1 H2 18 50 16 1.1 0.15 0.3 1.725 10.7 1.6

[0030] Figure 6 is the return loss diagram of the antenna array of the present application with the change of the slot width S1. It can be observed from the diagram that when S1 = 0.25 mm, the matching of the antenna is the best, the frequency band width is 6.52 GHz-7.22 GHz,

[0031] Figure 7Fig. 1 is a return loss diagram of the antenna array of the present application with the value of the slot length S2 changing; Fig. 2 is a return loss diagram of the antenna array of the present application with the value of the distance S3 from the feeding point to the center of the antenna array changing; Fig. 3 is an E-plane gain pattern diagram of the antenna array of the present application; Fig. 4 is an H-plane gain pattern diagram of the antenna array of the present application; and Fig. 5 is a schematic diagram of the multiple-coupling feeding of the antenna array of the present application.

[0032] Figure 8 Fig. 1 is a return loss diagram of the antenna array of the present application with the value of the slot length S2 changing; Fig. 2 is a return loss diagram of the antenna array of the present application with the value of the distance S3 from the feeding point to the center of the antenna array changing; Fig. 3 is an E-plane gain pattern diagram of the antenna array of the present application; Fig. 4 is an H-plane gain pattern diagram of the antenna array of the present application; and Fig. 5 is a schematic diagram of the multiple-coupling feeding of the antenna array of the present application.

[0033] Figure 9 Fig. 1 is a return loss diagram of the antenna array of the present application with the value of the slot length S2 changing; Fig. 2 is a return loss diagram of the antenna array of the present application with the value of the distance S3 from the feeding point to the center of the antenna array changing; Fig. 3 is an E-plane gain pattern diagram of the antenna array of the present application; Fig. 4 is an H-plane gain pattern diagram of the antenna array of the present application; and Fig. 5 is a schematic diagram of the multiple-coupling feeding of the antenna array of the present application. Figure 10 Fig. 1 is a return loss diagram of the antenna array of the present application with the value of the slot length S2 changing; Fig. 2 is a return loss diagram of the antenna array of the present application with the value of the distance S3 from the feeding point to the center of the antenna array changing; Fig. 3 is an E-plane gain pattern diagram of the antenna array of the present application; Fig. 4 is an H-plane gain pattern diagram of the antenna array of the present application; and Fig. 5 is a schematic diagram of the multiple-coupling feeding of the antenna array of the present application.

[0034] Working principle: the multiple-coupling feeding of the present application is realized by coaxial feeding of the coaxial cable, directly feeding wireless energy to the metal patch with the gradual change structure, coupling and feeding electromagnetic energy to the rectangular slot by the metal patch with the gradual change structure, then coupling energy to the rectangular metal patch by the rectangular slot, and finally feeding the butterfly-shaped antenna unit by the rectangular metal patch.

Claims

1. An ultra-wideband (UWB) slot antenna array, comprising: The utility model relates to a coaxial antenna, including: Medium substrate (2), metal reflection board (3), short circuit post (4) and coaxial cable outer conductor (5), medium substrate (2) is connected with metal reflection board (3) through short circuit post (4), the lower surface of medium substrate (2) is copper clad surface (6), copper clad surface (6) is connected with metal reflection board (3) through coaxial cable outer conductor (5), the upper surface central position of medium substrate (2) is equipped with the metal patch (7) of gradual change structure, the both sides of metal patch (7) of gradual change structure are symmetrically provided with two groups of butterfly groove antenna (8), butterfly groove antenna (8) is the slot structure etched on copper clad surface (6), the upper surface of medium substrate (2) is also equipped with two groups of rectangular metal patch (9), two groups of rectangular metal patch (9) are located respectively in the middle of each group of butterfly groove antenna (8) on the both sides of metal patch (7) of gradual change structure, and the length direction of each group of rectangular metal patch (9) is consistent with the extension direction of the length of metal patch (7) of gradual change structure, the extension direction of the length of each group of butterfly groove antenna (8) is consistent with the long side direction of medium substrate (2), copper clad surface (6) middle is also equipped with rectangular groove (1), and rectangular groove (1) is orthogonal with metal patch (7) of gradual change structure, the inside of coaxial cable outer conductor (5) is equipped with coaxial cable inner conductor (10), coaxial cable inner conductor (10) is via hole structure, penetrates medium substrate (2), and the top is connected with metal patch (7) of gradual change structure, wherein, two groups of butterfly groove antenna (8) respectively have 4 evenly distributed butterfly groove antennas, the shape of metal patch of gradual change structure is trapezoidal structure, wherein the upper base is 1.0-1.2mm, the lower base is 2.0-2.4mm, and the height is 30-32mm.

2. The array of super-wideband slot antenna according to claim 1, wherein, The spacing between the two groups of butterfly groove antennas (8) is 45-55mm horizontally and 15-20mm vertically.

3. The array of super-wideband slot antenna according to claim 1, wherein, The distance between the triangular vertices of each pair of butterfly groove antennas is 1.8-2.0mm, and the groove width at the triangular vertices of each butterfly groove antenna is 0.01-0.03mm.

4. The array of super-wideband slot antenna according to claim 1, wherein, Each group of butterfly groove antennas has a length of 40-45mm and a width of 10-12mm.

5. The array of super-wideband slot antenna according to claim 1, wherein, The rectangular metal patch has a length of 15-20mm and a width of 2-2.5mm.

6. The array of super-wideband slot antenna according to claim 1, wherein, The rectangular groove has a length of 80-82mm and a width of 0.2-0.3mm.

7. The antenna array of claim 1, wherein, The medium substrate is an FR4 medium plate with a length of 100-120mm, a width of 85-90mm, and a thickness of 0.8-1.6mm.

8. The array of super-wideband slot antenna according to claim 1, wherein, The butterfly groove antenna array uses a coaxial feeding structure.

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