Antenna module

Abstract

An antenna module includes a first radiator, a ground plane, and a second radiator. The first radiator includes a first section and a second section. The first section includes a first end and a second end, the first end being a feeding end, the second end being connected to the second section. The first section includes a plurality of first portions bent back and forth along a first direction, and the second section includes a plurality of second portions bent back and forth along a second direction. An included angle between the first direction and the second direction is between 60 degrees and 120 degrees. The ground plane is disposed beside the first section of the first radiator. The second radiator has one end connected to the feeding end of the first radiator and the other end vertically connected to the ground plane.

Description

Technical Field

[0001] The present invention relates to an antenna module, and particularly to an antenna module. Background Art

[0002] Since existing LoRa (Long Range) antennas need to cover European and Chinese frequency bands. In the early stage, they were designed in a coupled type, and the volume and clearance area occupied by the antenna would be relatively large in order to achieve broadband characteristics. However, due to the space limitation of small devices, such antennas are not easy to design. Summary of the Invention

[0003] An object of the present invention is to provide an antenna module, which can have a smaller size and broadband characteristics through special design.

[0004] An antenna module of the present invention includes a first radiator, a ground plane, and a second radiator. The first radiator includes a first section and a second section. The first section includes a first end and a second end, the first end is a feeding end, the second end is connected to the second section, the first section includes a plurality of first parts bent back and forth along a first direction, the second section includes a plurality of second parts bent back and forth along a second direction, and an included angle between the first direction and the second direction is between 60 degrees and 120 degrees. The ground plane is disposed beside the first section of the first radiator. The second radiator has one end connected to the feeding end of the first radiator and the other end vertically connected to the ground plane.

[0005] In an embodiment of the present invention, there are a plurality of first coupling gaps between these first parts, and there are a plurality of second coupling gaps between these second parts.

[0006] In an embodiment of the present invention, there is a third coupling gap between the first section of the first radiator and the second radiator, and there is a fourth coupling gap between at least one of these second parts and the closest first part, and the fourth coupling gap is greater than each of the first coupling gaps, the second coupling gaps, and the third coupling gap.

[0007] In an embodiment of the present invention, the length of the first section is 1 / 2 times the length of the second section.

[0008] In an embodiment of the present invention, the length of the second radiator is 1 / 2 times the length of the first section.

[0009] In an embodiment of the present invention, the width of the first section is smaller than the width of the second section.

[0010] In an embodiment of the present invention, the antenna module excites a frequency band, and the length of the first radiator is 1 / 4 times the wavelength of the frequency band.

[0011] In an embodiment of the present invention, the second radiator described above includes a first section, a second section, and a third section connected in sequence. One end of the second radiator is located at the first section, the first section is connected to the feeding end through this end, the second section is a patch, the other end of the second radiator is located at the third section and is far from the second section, and the third section is vertically connected to the ground plane through this other end.

[0012] In an embodiment of the present invention, the above-mentioned third section bends back and forth in the direction close to and away from the first section.

[0013] In an embodiment of the present invention, the above-mentioned first radiator, second radiator, and ground plane are located in the same plane.

[0014] Based on the above, the first radiator of the antenna module of the present invention includes a first section and a second section. The first end of the first section is the feeding end, and the second end of the first section is connected to the second section. The first section includes a plurality of first parts that bend back and forth along a first direction, and the second section includes a plurality of second parts that bend back and forth along a second direction. An included angle between the first direction and the second direction is between 60 degrees and 120 degrees. The ground plane is disposed beside the first section of the first radiator. One end of the second radiator is connected to the feeding end of the first radiator, and the other end is vertically connected to the ground plane. Through the above design, the antenna module of the present invention can achieve a broadband effect, and can have a smaller size, and can be applied to small-sized devices. Description of the Drawings

[0015] Figure 1 is a schematic diagram of an antenna module according to an embodiment of the present invention.

[0016] Figure 2 is Figure 1 a schematic diagram of the antenna module disposed in an electronic device.

[0017] Figure 3 is Figure 2 a schematic diagram of another perspective.

[0018] Figure 4 is Figure 1 a relationship diagram of frequency - VSWR of the antenna module.

[0019] Figure 5 is Figure 1 a relationship diagram of frequency - antenna efficiency of the antenna module.

[0020] Reference numerals are as follows:

[0021] θ: included angle

[0022] A1 to A15, B1 to B6, G1 to G3: positions

[0023] C1 to C3: First coupling gap

[0024] C4 to C6: Second coupling gap

[0025] C7: Third coupling gap

[0026] C8: Fourth coupling gap

[0027] D1: First direction

[0028] D2: Second direction

[0029] L1: Length

[0030] L2: Width

[0031] L3 to L7: Distance

[0032] X, Y, Z: Coordinates

[0033] 10: Electronic device

[0034] 11: Power supply board

[0035] 12: Magnet

[0036] 13: NFC Tag antenna

[0037] 14: Grounding copper foil

[0038] 15: Plastic housing

[0039] 16: Switching board

[0040] 17: Main board

[0041] 18: Metal middle frame

[0042] 19: Hard disk

[0043] 20: Conductive foam

[0044] 21: Heat dissipation conductor

[0045] 22: Touch panel

[0046] 30: Coaxial transmission line

[0047] 100: Antenna module

[0048] 110: First radiator

[0049] 111: First section

[0050] 112: First end

[0051] 113: Second end

[0052] 114: Feeding end

[0053] 115: First part

[0054] 116: Second section

[0055] 117: Second part

[0056] 120: Second radiator

[0057] 122: First segment

[0058] 124: Second segment

[0059] 126: Third segment

[0060] 130: Ground plane Detailed implementation mode

[0061] Figure 1 is a schematic diagram of an antenna module according to an embodiment of the present invention. Please refer to Figure 1 , the antenna module 100 of this embodiment includes a first radiator 110, a ground plane 130 and a second radiator 120. In this embodiment, the first radiator 110, the second radiator 120 and the ground plane 130 are located in the same plane.

[0062] The first radiator 110 includes a first section 111 (positions A1 to A8) and a second section 116 (positions A8 to A15). The first section 111 includes a plurality of first parts 115 (positions A1A2, A3A4, A5A6, A7A8) bent back and forth along the first direction D1, and there are a plurality of first coupling gaps C1, C2, C3 between these first parts 115. The first coupling gaps C1, C2, C3 are between 0.5 millimeter (mm) and 1.5 millimeters (mm), for example, 1 millimeter (mm).

[0063] The first section 111 includes a first end 112 (position A1) and a second end 113 (position A8), the first end 112 is a feeding end 114, and the second end 113 is connected to the second section 116.

[0064] An included angle θ between the first direction D1 and the second direction D2 is between 60 degrees and 120 degrees, for example, 90 degrees, so that the first section 111 and the second section 116 are in an L shape. Through the above angle range, the effect of increasing the bandwidth can be achieved.

[0065] The second section 116 includes a plurality of second parts 117 (positions A8A9, A10A11, A12A13, A14A15) bent back and forth along the second direction D2.

[0066] There are a plurality of second coupling gaps C4, C5, C6 between these second portions 117 of the second section 116. The second coupling gaps C4, C5, C6 are between 0.5 millimeter (mm) and 1.5 millimeters (mm), for example, 1 millimeter (mm).

[0067] In addition, there is a third coupling gap C7 between the first section 111 (at position A1A2) of the first radiator 110 and the second radiator 120 (at position B2B3). The third coupling gap C7 is between 0.5 millimeter (mm) and 1.5 millimeters (mm), for example, 1 millimeter (mm). The third coupling gap C7 is used to maintain a certain distance between the paths of positions A1, A2 and the paths of positions B2, B3 to improve the impedance matching of the antenna.

[0068] Furthermore, in this embodiment, there is a fourth coupling gap C8 between at least one of these second portions 117 and the nearest first portion 115. Specifically, there is a fourth coupling gap C8 between positions A11, A12 and positions A5, A6. In this embodiment, the fourth coupling gap C8 is greater than each of the first coupling gaps C1~C3, each of the second coupling gaps C2~C6, and the third coupling gap C7. The fourth coupling gap C8 is between 1.5 millimeters (mm) and 2.5 millimeters (mm), for example, 2 millimeters (mm). The fourth coupling gap C8 is used to maintain a certain distance between the paths of positions A11, A12 and the paths of positions A5, A6 to improve the antenna efficiency and bandwidth.

[0069] In this embodiment, the antenna module 100 excites a frequency band, for example, the 433 MHz~510 MHz frequency band of the LoRa antenna. The length of the first radiator 110 is 1 / 4 times the wavelength of this frequency band. In addition, the length of the first section 111 of the first radiator 110 is 1 / 2 times the length of the second section 116. That is to say, the length of the first section 111 of the first radiator 110 is 1 / 12 times the wavelength of the frequency band, and the length of the second section 116 of the first radiator 110 is 1 / 6 times the wavelength of the frequency band.

[0070] In addition, the width of the first section 111 of the first radiator 110 is less than the width of the second section 116. In this embodiment, the second section 116 far from the feeding end 114 has a larger width, which can make the antenna have better characteristics.

[0071] As Figure 1 shown, the ground plane 130 (positions G1~G3) is arranged beside the first section 111 of the first radiator 110. In this embodiment, the left boundary of the ground plane 130 does not exceed the left boundary of the first section 111 of the first radiator 110 at position A5, and keeps a certain distance from the second section 116 to avoid affecting the antenna characteristics.

[0072] In addition, the left boundary of the ground plane 130 will be between positions A4 and A5 and not too close to the feeding end 114 (position A1), so that the ground plane 130 has sufficient area. In addition, the ground plane 130 is connected to the system ground plane 130 through the grounding copper foil 14. In addition, the positive end of the coaxial transmission line 30 is connected to the feeding end 114 (position A1), and the negative end of the coaxial transmission line 30 is connected to the grounding end G1.

[0073] Furthermore, one end (position B1) of the second radiator 120 is connected to the feeding end 114 of the first radiator 110, and the other end (position B6) is vertically connected to the ground plane 130. Specifically, the second radiator 120 includes a first section 122, a second section 124, and a third section 126 connected in sequence. This end (position B1) of the second radiator 120 is located in the first section 122. The first section 122 is connected to the feeding end 114 through this end (position B1) and extends along the first direction D1. The second section 124 is a patch. If paired with Figure 2 It can be seen that the second section 124 of the second radiator 120 is quite close to the NFC Tag antenna 13. The second section 124 of the second radiator 120 has a relatively large area, enabling the antenna module 100 to avoid being interfered by the NFC Tag antenna 13 and having better antenna characteristics and impedance matching.

[0074] The third section 126 is located between the second section 124 and the ground plane 130 and bends back and forth in the direction (second direction D2) of approaching and moving away from the first section 122. Such a design can make the part of the third section 126 close to the first section 122 less, and thus have better impedance matching.

[0075] The other end (position B6) of the second radiator 120 is located in the third section 126 and away from the second section 124. The third section 126 is vertically connected to the ground plane 130 through this other end (position B6). Compared with the known PIFA antenna which lands in a way parallel to the boundary of the ground plane 130, in this embodiment, the third section 126 of the second radiator 120 lands in a way perpendicular to the boundary of the ground plane 130. This perpendicular landing design can shorten the antenna radiation landing path, save space, and leave more space for the antenna pattern, making the design of the antenna pattern more free and flexible. In addition, the path formed by positions B1, B2, B5, and B6 can enclose an F-shaped grounding structure, making position B1 flush with position G1, so that there is more available radiation space on the left side of position A1. In addition, in this embodiment, the length of the second radiator 120 is 1 / 2 times the length of the first section 111 to have better impedance matching.

[0076] The antenna module 100 of this embodiment can achieve a broadband effect through the above design, and can be not affected by surrounding components, and can be applied to small-sized devices.

[0077] Figure 2 is Figure 1 a schematic diagram of the antenna module disposed in the electronic device. Figure 3 is Figure 2 a schematic diagram of another perspective. It should be noted that Figure 2 is the perspective looking from the YZ plane in the X direction, Figure 3 is the perspective looking from the XZ plane in the Y direction.

[0078] Please refer to Figure 2 and Figure 3 , in this embodiment, the electronic device 10 is, for example, a small remote storage device, with the overall length being about 214 millimeters, the width being about 136 millimeters, and the height being about 68 millimeters. The length L1 of the antenna module 100 is about 60 millimeters, and the width L2 is about 20 millimeters, thus having a small size.

[0079] There are multiple metal structures around the antenna module 100. For example, the distances L3 and L4 between the antenna module 100 and the power supply board 11 are about 10 millimeters, the distance L5 between the antenna module 100 and the magnet 12 is about 10 millimeters, and the distance L6 between the antenna module 100 and the NFC Tag antenna 13 is about 10 millimeters. The distance L7 ( Figure 3 ) between the antenna module 100 and the switching board 16 is about 10 millimeters.

[0080] As Figure 3 shown, the antenna module 100 is attached to the inner sidewall of the plastic housing 15 and is connected to the ground copper foil 14. The ground copper foil 14 is disposed along the back cover of the plastic housing 15 and the touch panel 22 (such as the panel of an electronic paper), and crosses the switching board 16. The heat dissipation conductor 21 (such as a copper foil for heat dissipation) is disposed on the back of the touch panel 22 for the touch panel 22 to dissipate heat. The ground copper foil 14, the conductive foam 20, the hard disk 19, the metal middle frame 18, and the main board 17 are connected to each other to jointly serve as a complete system ground plane, so that the antenna module 100 has a large system ground plane.

[0081] Figure 4 is Figure 1 a relationship diagram of the frequency - VSWR of the antenna module. Please refer to Figure 4 , in this embodiment, the voltage standing wave ratio (VSWR) of the antenna module 100 at a frequency of 433 MHz to 510 MHz can be below 8, and thus has good performance.

[0082] Figure 5 is Figure 1 a relationship diagram of the frequency - antenna efficiency of the antenna module. Please refer toFigure 5 In this embodiment, the antenna module 100 has good performance with an antenna efficiency of -4.4 dBi to -5.3 dBi at a frequency of 433 MHz to 510 MHz.

[0083] In summary, the first radiator of the antenna module of the present invention includes a first section and a second section. The first end of the first section is the feeding end, and the second end of the first section is connected to the second section. The first section includes a plurality of first parts bent back and forth along a first direction, and the second section includes a plurality of second parts bent back and forth along a second direction. An included angle between the first direction and the second direction is between 60 degrees and 120 degrees. The ground plane is disposed beside the first section of the first radiator. One end of the second radiator is connected to the feeding end of the first radiator, and the other end is vertically connected to the ground plane. Through the above design, the antenna module of the present invention can achieve a broadband effect and can have a smaller size, and can be applied to small-sized devices.

Claims

1. An antenna module, characterized in that, Comprising: A first radiator, comprising a first section and a second section, wherein the first section comprises a first end and a second end, the first end being a feeding end, the second end being connected to the second section, the first section comprising a plurality of first parts bent back and forth along a first direction, the second section comprising a plurality of second parts bent back and forth along a second direction, an included angle between the first direction and the second direction being between 60 degrees and 120 degrees; A ground plane, disposed beside the first section of the first radiator; and A second radiator, comprising a first segment, a second segment and a third segment connected in sequence, one end of the first segment being connected to the feeding end of the first radiator, the second segment being a patch, and one end of the third segment far from the second segment being perpendicularly connected to the ground plane.

2. The antenna module according to claim 1, characterized in that, There are a plurality of first coupling gaps between the plurality of the first parts, and there are a plurality of second coupling gaps between the plurality of the second parts.

3. The antenna module according to claim 2, characterized in that, There is a third coupling gap between the first section of the first radiator and the second radiator, and there is a fourth coupling gap between at least one of the plurality of the second parts and the closest first part, the fourth coupling gap being greater than each of the first coupling gaps, each of the second coupling gaps and the third coupling gap.

4. The antenna module according to claim 1, wherein, The length of the first section is 1 / 2 times the length of the second section.

5. The antenna module according to claim 1, wherein The length of the second radiator is 1 / 2 times the length of the first section.

6. The antenna module according to claim 1, wherein, The width of the first section is less than the width of the second section.

7. The antenna module according to claim 1, characterized in that, The antenna module excites a frequency band, and the length of the first radiator is 1 / 4 times the wavelength of the frequency band.

8. The antenna module according to claim 1, wherein The third segment is bent back and forth in directions close to and away from the first segment.

9. The antenna module according to claim 1, wherein The first radiator, the second radiator and the ground plane are in the same plane.

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