UWB (Ultra Wideband) micro antenna

Abstract

The utility model discloses a UWB broadband miniature antenna, which belongs to the technical field of antennas, and comprises a rectangular dielectric substrate, two ends of the dielectric substrate are respectively provided with a metal layer, the upper surface of the dielectric substrate is pasted with a radiation patch, and the radiation patch is arranged between the metal layers at the two ends. The metal layer at one end can be grounded, and the metal layer at the other end can be connected with a signal line; the middle part of the radiation patch is provided with a leakage seam, and the dielectric substrate is made of a low dielectric constant material. According to the utility model, the radiation patch with the leakage seam is pasted on the upper surface of the dielectric substrate made of the low dielectric constant material, and the two ends of the dielectric substrate are grounded and connected with the signal line through the metal layers respectively. The antenna provided by the utility model adopts a leakage seam structure, so that a small-size antenna can be completed in a low-K material; meanwhile, by adjusting the position and the shape of the leakage seam on the antenna, the antenna can have the field patterns of a polarized antenna and a PIFA antenna, and the frequency band width can be greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of antennas, and particularly relates to a UWB broadband micro antenna. Background Art

[0002] At present, in electronic products such as mobile phones and sensors, ultra-wideband (UWB) ceramic chip antennas are mostly used. Existing UWB ceramic antennas are all in a coupled structure and are easily limited by the material medium in terms of size design and adjustment. The higher the dielectric constant of the ceramic antenna, the smaller the antenna size, which can improve the utilization efficiency of the internal space of the mobile phone. Therefore, it is necessary to develop a new type of micro antenna to solve the contradiction between small-sized antennas and low-dielectric-constant materials (low-K materials). Summary of the Utility Model

[0003] To solve the above problems, the utility model provides a UWB broadband micro antenna.

[0004] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0005] A UWB broadband micro antenna, the antenna has a rectangular dielectric substrate, metal layers are respectively provided at both ends of the dielectric substrate, a radiation patch is attached to the upper surface of the dielectric substrate and is disposed between the two end metal layers, one end metal layer can be grounded, and the other end metal layer can be connected to a signal line; a leakage slot is provided in the middle of the radiation patch, and the dielectric substrate is made of a low-dielectric-constant material.

[0006] Further, the radiation patch includes an I-shaped part and a square part with a leakage slot. The bottom of the square part is connected to the top of the I-shaped part. The other ends of the square part and the I-shaped part are respectively connected to the two end metal layers. The lower horizontal line of the I-shaped part is connected to the signal line through the lower end metal layer, and the top of the square part abuts or is close to the upper end metal layer.

[0007] Further, the leakage slot in the middle of the square part is closed or open.

[0008] Further, the closed leakage slot is triangular or rectangular.

[0009] Further, the open leakage slot is an inverted T shape that penetrates the inside and outside at the upper end, and there is a gap between the top of the square part and the upper end metal layer.

[0010] Further, the metal layers are arranged along the two short sides of the dielectric substrate, and the two end metal layers can be welded and fixed in the clearance area of the circuit board. One end metal layer is grounded through the lower layer of the circuit board, and the other end metal layer can be connected to the signal line on the circuit board.

[0011] Further, the metal layers are welded to the clearance area of the circuit board by lead-free solder paste.

[0012] Further, the other end of the signal line on the circuit board is provided with an SMA connector capable of connecting a signal line.

[0013] Further, the length of the dielectric substrate is 6 ± 0.3 mm, the width is 5 ± 0.3 mm, and the thickness is 0.5 ± 0.15 mm.

[0014] Compared with the prior art, the technical progress achieved by the present utility model is as follows:

[0015] In the present utility model, a radiation patch with a leakage slot is pasted on the upper surface of a dielectric substrate made of a low dielectric constant material. Both ends of the dielectric substrate are grounded and connected to a signal line through metal layers respectively. The antenna provided by the present utility model adopts a leakage slot structure, which can be realized in a low-K material for a small-sized antenna. At the same time, by adjusting the position and shape of the leakage slot on the antenna, the antenna can have the field patterns of a polarized antenna and a PIFA antenna, which can greatly improve the bandwidth. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model.

[0017] In the drawings:

[0018] Figure 1 is a schematic structural diagram of a UWB broadband micro antenna provided by Embodiment 1 of the present utility model;

[0019] Figure 2 is Figure 1 a schematic back structure diagram of the UWB broadband micro antenna in;

[0020] Figure 3 is a schematic structural diagram of a UWB broadband micro antenna provided by Embodiment 2 of the present utility model;

[0021] Figure 4 is a schematic structural diagram of a UWB broadband micro antenna provided by Embodiment 3 of the present utility model

[0022] Figure 5 is a schematic structural diagram of a UWB broadband micro antenna provided by Embodiment 4 of the present utility model

[0023] Figure 6 is Figure 1 an application state diagram of the UWB broadband micro antenna in;

[0024] Figure 7 is Figure 6 a schematic structural diagram of the circuit board in;

[0025] Figure 8 This is the field pattern of the UWB broadband micro antenna in Example 1 of the present utility model;

[0026] In the picture:

[0027] 10-antenna; 1-dielectric substrate; 2-metal layer; 3-radiation patch, 31-I-shaped part, 32-mouth part; 4-circuit board; 5-leakage seam; 01-signal line, 02-clearance area, 03-SMA connector, 04-circuit component welding point. DETAILED DESCRIPTION

[0028] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. The following embodiments of the present invention will be described in conjunction with the accompanying drawings.

[0029] like Figure 1 、 Figure 2 and Figure 6 As shown, Example 1 of the present invention provides a UWB broadband micro antenna. The antenna 10 comprises a rectangular dielectric substrate 1 with metal layers 2 at each end. A radiating patch 3 is attached to the upper surface of the dielectric substrate 1 and disposed between the two metal layers 2. The metal layer 2 at one end can be grounded, while the metal layer 2 at the other end can be connected to a signal line 01 on a circuit board 4. A leaky slot 5 is provided in the middle of the radiating patch 3. The dielectric substrate 1 is made of a low-dielectric-constant material. This antenna structure is a leaky slot antenna, exhibiting the field patterns of a polarized antenna and a PIFA antenna, significantly increasing the bandwidth.

[0030] As a preferred structure, Figure 1 、 2 As shown, the radiating patch 3 includes an I-shaped portion 31 and a mouth portion 32 with a leakage slot 5. The bottom of the mouth portion 32 is connected to the top of the I-shaped portion 31. The other ends of the mouth portion 32 and the I-shaped portion 31 are respectively connected to the two end metal layers 2. The lower horizontal line of the I-shaped portion 31 is connected to the signal line 01 on the circuit board 4 through the lower metal layer 2. The top of the mouth portion 32 abuts or is close to the upper metal layer 2. A radiating patch with this structure can achieve fine-tuning of the frequency. Using this leakage slot structure antenna can greatly increase the bandwidth.

[0031] When designing specifically, Figures 1-5As shown, the middle leakage slot 5 of the square-shaped part 32 is closed or open. Among them, the length of the dielectric substrate 1 is 6 ± 0.3 mm, the width is 5 ± 0.3 mm, and the thickness is 0.5 ± 0.15 mm; the two end metal layers 2 are respectively arranged along the two short sides of the dielectric substrate 1, so as to realize the fabrication of a small-sized antenna in a low-dielectric constant material (low-K material). By adopting leakage slots 5 with different shapes, the antenna can have the field patterns of a polarized antenna and a PIFA antenna, such as Figure 8 shown.

[0032] such as Figure 1 shown, in Embodiment 1, the closed leakage slot 5 is designed to be strip-shaped.

[0033] such as Figure 3 shown, in Embodiment 2, the closed leakage slot 5 is designed to be a triangular structure.

[0034] such as Figure 4 shown, in Embodiment 3, the closed leakage slot 5 is designed to be rectangular.

[0035] such as Figure 5 shown, in Embodiment 4, the open leakage slot 5 is designed to be an inverted T shape with the upper end penetrating inside and outside, and there is a gap between the top of the square-shaped part 32 and the upper end metal layer 2.

[0036] In a specific example of the present utility model, such as Figure 2 、 6 shown, the two end metal layers 2 can be welded and fixed to the upper clearance area 02 of the circuit board 4, one end metal layer 2 is grounded through the lower layer of the circuit board 4, and the other end metal layer 2 can be connected to the signal line 01 on the circuit board 4; the other end of the signal line 01 on the circuit board 4 is provided with an SMA connector 03 capable of connecting a signal line. Among them, the metal layer 2 is welded to the clearance area 02 of the circuit board through lead-free solder paste. In Figure 7 , the green area is the welding position of the two end metal layers. The upper layer of the circuit board is the clearance area and the lower layer can be grounded. After welding the antenna, the two metal layers serve as two PIN pins, one can be grounded locally and the other can be connected to the signal line 01 on the circuit board 4, and the signal line 01 is connected to the signal line through the SMA connector 03 for testing.

[0037] To sum up, the structure of the present utility model is simple and compact. By adopting the leakage slot architecture design, it can realize the fabrication of a small-sized antenna on a low-dielectric constant material (low-K material). At the same time, by adjusting the position and shape of the leakage slot, the antenna can have the field patterns of a polarized antenna and a PIFA antenna. The present utility model can be applied to automotive sensors, ultra-wideband radios, remote controls, and some precision measuring instruments, and has great application prospects.

[0038] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the scope of protection of the claims of the present utility model.

Claims

1. A UWB broadband micro antenna, characterized in that: The antenna includes a rectangular dielectric substrate. Metal layers are respectively provided at two ends of the dielectric substrate. A radiation patch is attached to the upper surface of the dielectric substrate and is disposed between the metal layers at two ends. One metal layer can be grounded and the other metal layer can be connected to a signal line; a leakage slot is provided in the middle of the radiation patch, and the dielectric substrate is made of a low dielectric constant material.

2. The UWB broadband micro antenna according to claim 1, characterized in that: The radiation patch includes an I-shaped part and a square-shaped part with a leakage slot. The bottom of the square-shaped part is connected to the top of the I-shaped part. The other ends of the square-shaped part and the I-shaped part are respectively connected to the metal layers at two ends. The lower horizontal line of the I-shaped part is connected to a signal line on a circuit board through the lower metal layer. The top of the square-shaped part abuts or is close to the upper metal layer.

3. The UWB broadband micro antenna according to claim 2, characterized in that: The leakage slot in the middle of the square-shaped part is closed or open.

4. The UWB broadband micro antenna according to claim 3, wherein: The closed leakage slot is triangular or rectangular.

5. The UWB broadband micro antenna according to claim 3, wherein: The open leakage slot is an inverted T shape that penetrates the inside and outside at the upper end. A gap is provided between the top of the square-shaped part and the upper metal layer.

6. The UWB broadband micro antenna according to claim 1, characterized in that: The metal layers are arranged along two short sides of the dielectric substrate. The metal layers at two ends can be welded and fixed to a clearance area of the circuit board. One metal layer is grounded through the lower layer of the circuit board, and the other metal layer can be connected to a signal line on the circuit board.

7. The UWB broadband micro antenna according to claim 6, characterized in that: The metal layer is welded to the clearance area of the circuit board by lead-free solder paste.

8. The UWB broadband micro antenna according to claim 7, characterized in that: An SMA connector capable of connecting a signal line is provided at the other end of the signal line on the circuit board.

9. A UWB broadband micro antenna according to any one of claims 1-8, characterized in that: The length of the dielectric substrate is 6 ± 0.3 mm, the width is 5 ± 0.3 mm, and the thickness is 0.5 ± 0.15 mm.

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