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, wherein the first section includes a first end and a second end, the first end is a feed end, and 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, and the second section includes a plurality of second parts bent back and forth along a second direction, and an angle between the first direction and the second direction is between 60 degrees and 120 degrees. The ground plane is arranged beside the first section of the first radiator. The second radiator has one end connected to the feed end of the first radiator, and the other end is vertically connected to the ground plane.

Description

Technical Field

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

[0002] As the existing LoRa (Long Range) antennas need to cover the European 443MHz and the mainland 433.05MHz~434.79MHz and 470MHz~510MHz frequency bands, the early design was based on the coupling type, and the volume and clearance area occupied by the antenna would be relatively large to achieve broadband characteristics. However, due to the space limitations of small devices, this type of antenna is not easy to design. Summary of the invention

[0003] The object of the present invention is to provide an antenna module which can have a smaller size and a broadband characteristic through a 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, wherein the first section includes a first end and a second end, the first end is a feed end, and 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, and the second section includes a plurality of second parts bent back and forth along a second direction, and an angle between the first direction and the second direction is between 60 degrees and 120 degrees. The ground plane is arranged next to the first section of the first radiator. The second radiator has one end connected to the feed end of the first radiator, and the other end is vertically connected to the ground plane.

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

[0006] In one embodiment of the present invention, a third coupling gap is provided between the first section of the first radiator and the second radiator, a fourth coupling gap is provided between at least one of the second portions and the first portion closest thereto, and the fourth coupling gap is larger than each of the first coupling gaps, each of the second coupling gaps and the third coupling gap.

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

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

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

[0010] In one 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 one embodiment of the present invention, the second radiator includes a first section, a second section and a third section connected in sequence, the end of the second radiator is located in the first section, the first section is connected to the feeding end through the end, the second section is a patch, the other end of the second radiator is located in the third section and away from the second section, and the third section is vertically connected to the ground plane through the other end.

[0012] In one embodiment of the present invention, the third section is bent back and forth in a direction close to the first section and away from the first section.

[0013] In an embodiment of the present invention, the first radiator, the second radiator and the ground plane are located on 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 a feed 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 angle between the first direction and the second direction is between 60 degrees and 120 degrees. The ground plane is arranged next to the first section of the first radiator. One end of the second radiator is connected to the feed end of the first radiator, and the other end is vertically connected to the ground plane. The antenna module of the present invention can achieve a broadband effect through the above design, and can have a smaller size, and can be applied to small-sized devices. BRIEF 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 yes Figure 1 A schematic diagram of an antenna module disposed in an electronic device.

[0017] Figure 3 yes Figure 2 Schematic diagram from another perspective.

[0018] Figure 4 yes Figure 1 Frequency-VSWR relationship diagram of the antenna module.

[0019] Figure 5 yes Figure 1 A frequency-antenna efficiency diagram of the antenna module.

[0020] The reference numerals are as follows:

[0021] θ: Angle

[0022] A1~A15、B1~B6、G1~G3: Location

[0023] C1~C3: First coupling gap

[0024] C4~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~L7: Distance

[0032] X, Y, Z: coordinates

[0033] 10: Electronic devices

[0034] 11: Power board

[0035] 12: Magnet

[0036] 13:NFC Tag Antenna

[0037] 14: Ground copper foil

[0038] 15: Plastic shell

[0039] 16: Switchboard

[0040] 17: Motherboard

[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: Part 1

[0054] 116: Second Section

[0055] 117: Part 2

[0056] 120: Second radiator

[0057] 122: First paragraph

[0058] 124: Second paragraph

[0059] 126: The third paragraph

[0060] 130: Ground plane DETAILED DESCRIPTION

[0061] Figure 1 is a schematic diagram of an antenna module according to an embodiment of the present invention. 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-A8) and a second section 116 (positions A8-A15). The first section 111 includes a plurality of first portions 115 (positions A1A2, A3A4, A5A6, A7A8) bent back and forth along a first direction D1, and a plurality of first coupling gaps C1, C2, C3 are defined between the first portions 115. The first coupling gaps C1, C2, C3 are between 0.5 mm and 1.5 mm, for example, 1 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 angle θ between the first direction D1 and the second direction D2 is between 60 degrees and 120 degrees, such as 90 degrees, so that the first section 111 and the second section 116 are L-shaped. The above angle range can achieve the effect of increasing bandwidth.

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

[0066] A plurality of second coupling gaps C4, C5, C6 are defined between the second portions 117 of the second section 116. The second coupling gaps C4, C5, C6 are between 0.5 mm and 1.5 mm, such as 1 mm.

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

[0068] In addition, in the present embodiment, a fourth coupling gap C8 is provided between at least one of the second portions 117 and the closest first portion 115. Specifically, a fourth coupling gap C8 is provided between positions A11 and A12 and positions A5 and A6. In the present embodiment, the fourth coupling gap C8 is larger than each of the first coupling gaps C1 to C3, each of the second coupling gaps C2 to C6, and the third coupling gap C7. The fourth coupling gap C8 is between 1.5 mm and 2.5 mm, for example, 2 mm. The fourth coupling gap C8 is used to maintain a certain distance between the paths of positions A11 and A12 and the paths of positions A5 and A6, so as to improve the antenna efficiency and bandwidth.

[0069] In this embodiment, the antenna module 100 excites a frequency band, for example, the 433MHz to 510MHz 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. In other words, 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 smaller 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 so that the antenna has better characteristics.

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

[0072] In addition, the left edge of the ground plane 130 is between positions A4 and A5, and is not too close to the feeding terminal 114 (position A1), so that the ground plane 130 has a 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 terminal 114 (position A1), and the negative end of the coaxial transmission line 30 is connected to the ground terminal G1.

[0073] Furthermore, one end (position B1) of the second radiator 120 is connected to the feed 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, and the first section 122 is connected to the feed end 114 through this end (position B1) and extends along the first direction D1. The second section 124 is a patch. If used 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 larger area to prevent the antenna module 100 from being interfered by the NFC Tag antenna 13 and to have 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 toward and away from the first section 122 (the second direction D2). This design allows the third section 126 to have a smaller portion close to the first section 122, thereby providing better impedance matching.

[0075] The other end (position B6) of the second radiator 120 is located at the third section 126 and away from the second section 124. The third section 126 is vertically connected to the ground plane 130 through the other end (position B6). Compared with the known PIFA antenna, which is grounded in parallel with the boundary of the ground plane 130, in this embodiment, the third section 126 of the second radiator 120 is grounded in a manner perpendicular to the boundary of the ground plane 130. Such a vertical grounding design can shorten the antenna radiation grounding path, save space, and give more space to the antenna totem, so that the design of the antenna totem is more free and flexible. In addition, the path formed by the positions B1, B2, B5, and B6 can form an F-shaped grounding structure, so that the position B1 is aligned with the position G1, so that there is more radiation space available on the left side of the 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 is not affected by surrounding elements, and can be applied to small-sized devices.

[0077] Figure 2 yes Figure 1 A schematic diagram of an antenna module disposed in an electronic device. Figure 3 yes Figure 2 A schematic diagram from another perspective. To illustrate, Figure 2 is the perspective from the YZ plane looking in the X direction, Figure 3 It is the perspective looking from the XZ plane to the Y direction.

[0078] See also Figure 2 and Figure 3 In this embodiment, the electronic device 10 is, for example, a small remote storage device, with a length of about 214 mm, a width of about 136 mm, and a height of about 68 mm. The antenna module 100 has a length L1 of about 60 mm and a width L2 of about 20 mm, and has 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 board 11 are about 10 mm, the distance L5 between the antenna module 100 and the magnet 12 is about 10 mm, and the distance L6 between the antenna module 100 and the NFC Tag antenna 13 is about 10 mm. The distance L7 between the antenna module 100 and the switch board 16 is about 10 mm. Figure 3 ) about 10 mm.

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

[0081] Figure 4 yes Figure 1 The frequency-VSWR relationship diagram of the antenna module. 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 may be less than 8, and has a good performance.

[0082] Figure 5 yes Figure 1 The relationship between frequency and antenna efficiency of the antenna module. Figure 5 In this embodiment, the antenna efficiency of the antenna module 100 at a frequency of 433 MHz to 510 MHz is -4.4 dBi to -5.3 dBi, which has a good performance.

[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 a feed 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 angle between the first direction and the second direction is between 60 degrees and 120 degrees. The ground plane is arranged next to the first section of the first radiator. One end of the second radiator is connected to the feed end of the first radiator, and the other end is vertically connected to the ground plane. The antenna module of the present invention can achieve a broadband effect through the above design, and can have a smaller size, and can be applied to small-sized devices.

Claims

1. An antenna module, characterized in that: include: 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 is a feed end, the second end is connected to the second section, the first section comprises a plurality of first portions bent back and forth along a first direction, the second section comprises a plurality of second portions bent back and forth along a second direction, and an angle between the first direction and the second direction is between 60 degrees and 120 degrees; a ground plane disposed beside the first section of the first radiator; and A second radiator includes a first section, a second section and a third section connected in sequence, wherein the first section has one end connected to the feed end of the first radiator, the second section is a patch, and the third section has one end away from the second section vertically connected to the ground plane.

2. The antenna module according to claim 1, characterized in that: A plurality of first coupling gaps are formed between the plurality of first portions, and a plurality of second coupling gaps are formed between the plurality of second portions.

3. The antenna module according to claim 2, characterized in that: A third coupling gap is provided between the first section of the first radiator and the second radiator, a fourth coupling gap is provided between at least one of the plurality of second parts and the first part closest thereto, and the fourth coupling gap is larger 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, characterized in that: The width of the first section is smaller 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 section bends back and forth in a direction close to the first section and away from the first section.

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

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