Antenna module and electronic device

Abstract

The present invention provides an antenna module and an electronic device thereof. The antenna module includes a first, a second, a third radiator and a ground radiator. The first radiator includes a first section and a second section connected to each other. The second radiator is connected to the first radiator and includes a third section and a fourth section connected to each other. The fourth section includes a feed-in end. The third radiator is connected to the third section of the second radiator. The ground radiator is connected to the third radiator. The first radiator, the second radiator, the third radiator and the ground radiator are connected in a bent manner in sequence to present a stepped shape. The first section of the first radiator and the fourth section of the second radiator are coupled together to produce a low frequency band, and the second section of the first radiator, the second radiator, the third radiator and the ground radiator are coupled together to produce a high frequency band, thereby reducing the length and width of the electronic device and achieving the required frequency band in a limited space.

Description

Technical Field

[0001] The present disclosure relates to an antenna module and an electronic device, and more particularly to a three-dimensional antenna module and an electronic device. Background Art

[0002] Currently, electronic devices are developing towards being thinner and lighter, and the space for antenna structures in electronic devices is limited. How to couple the required frequency band in a limited space is a research direction in this field. Summary of the invention

[0003] The purpose of the present disclosure is to provide an antenna module which has a special shape and can couple a required frequency band in a limited space.

[0004] An antenna module disclosed in the present invention includes a first radiator, a second radiator, a third radiator and a ground radiator. The first radiator includes a first section and a second section connected to each other. The second radiator is connected to the first radiator, and the second radiator includes a third section and a fourth section connected to each other, wherein the fourth section includes a feed end. The third radiator is connected to the third section of the second radiator. The ground radiator is connected to the third radiator, wherein the first radiator, the second radiator, the third radiator and the ground radiator are connected in a bent manner in sequence to present a stepped shape, the first section of the first radiator and the fourth section of the second radiator are coupled together to produce a low frequency band, and the second section of the first radiator, the second radiator, the third radiator and the ground radiator are coupled together to produce a high frequency band.

[0005] In one embodiment of the present disclosure, the length of the first section of the first radiator and the fourth section of the second radiator is 1 / 4 times the wavelength of the low frequency band.

[0006] In one embodiment of the present disclosure, the length of the second section of the first radiator and the fourth section of the second radiator is 1 / 4 times the wavelength of the high frequency band.

[0007] In one embodiment of the present disclosure, the lengths of the second radiator, the third radiator and the ground radiator are 1 / 4 to 1 / 2 times the wavelength of the high frequency band.

[0008] In one embodiment of the present disclosure, the antenna module includes an air vent formed between the second radiator and the ground radiator and located next to the third radiator.

[0009] In an embodiment of the present disclosure, the ground radiator includes a first edge connected to the third radiator and a notch recessed inward from the first edge, wherein the notch is connected to the vent.

[0010] In an embodiment of the present disclosure, the antenna module further includes a first conductive element, which is overlapped with the ground radiator and extends to a system ground plane in a direction away from the third radiator.

[0011] In one embodiment of the present disclosure, the grounded radiator includes a first edge connected to the third radiator and a second edge adjacent to the first edge, the second edge and the feeding end are located on the same side, and the antenna module also includes a second conductive member that overlaps the second edge of the grounded radiator to be grounded.

[0012] An electronic device disclosed in the present invention comprises an insulating member, an antenna module and a metal back cover. The insulating member has a stepped profile. The antenna module is arranged on the insulating member along the profile of the insulating member. The insulating member and the antenna module are arranged in the metal back cover.

[0013] In one embodiment of the present disclosure, the electronic device further comprises a display panel disposed relative to the metal back cover, the insulating member and the antenna module are located in a frame area at the outer edge of the display panel, and the first radiator of the antenna module is perpendicular to the display panel.

[0014] Based on the above, the antenna module of the present invention can reduce the length and width of the antenna module by bending the first radiator, the second radiator, the third radiator and the ground radiator in sequence to present a step-like shape. In addition, the first section of the first radiator and the fourth section of the second radiator of the antenna module of the present invention are coupled together to produce a low-frequency band, and the second section of the first radiator and the fourth section of the second radiator as well as the second radiator, the third radiator and the ground radiator are coupled together to produce a high-frequency band, so that the required frequency band can be achieved in a limited space. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 is a schematic diagram of an electronic device according to an embodiment of the present disclosure.

[0017] Figure 3 yes Figure 2 A schematic top view of two antenna modules of an electronic device disposed on an insulating member.

[0018] Figure 4 yes Figure 3 A partial three-dimensional schematic diagram of .

[0019] Figure 5 It is along Figure 2 Schematic diagram of the cross section of the A-A' line segment.

[0020] Figure 6 yes Figure 3 Frequency-return loss diagram for the two antenna modules.

[0021] Figure 7 yes Figure 3 The frequency-isolation relationship diagram of the two antenna modules.

[0022] Figure 8 yes Figure 1 A frequency-antenna efficiency relationship diagram of two antenna modules on an electronic device.

[0023] Fig. 9 and Fig.10 They are Figure 1 Field patterns of the antenna module and the planar antenna of the electronic device at low and high frequencies on the XY plane.

[0024] The reference numerals are as follows:

[0025] A1~A4、B1、B2、G1~G3: Location

[0026] L1: Length

[0027] L2, L9: Width

[0028] L5, L6, L7: Dimensions

[0029] L3, L4, L8, L10: Distance

[0030] X, Y, Z: coordinates

[0031] 10: Electronic devices

[0032] 12: Border area

[0033] 20: Insulation

[0034] 22: Bolt

[0035] 30:Metal back cover

[0036] 32: Opening

[0037] 40: Display Panel

[0038] 50: System ground plane

[0039] 60:Front frame

[0040] 70: Planar antenna

[0041] 100: Antenna module

[0042] 110: First Radiator

[0043] 112: The first paragraph

[0044] 114: The second section

[0045] 120: Second radiator

[0046] 122: The third section

[0047] 124: The fourth section

[0048] 126: Positioning hole

[0049] 130: The Third Radiator

[0050] 140: Ground radiator

[0051] 142: First Edge

[0052] 144: Notch

[0053] 146: Second Edge

[0054] 150: Wind outlet

[0055] 160: first conductive element

[0056] 162: Second conductive element

[0057] 165: Coaxial transmission line DETAILED DESCRIPTION

[0058] Figure 1 is a schematic diagram of an antenna module according to an embodiment of the present disclosure. Figure 1 In this embodiment, the antenna module 100 is a planar inverted-F antenna (PIFA) antenna. The antenna module 100 includes a first radiator 110, a second radiator 120, a third radiator 130 and a ground radiator 140. The first radiator 110, the second radiator 120, the third radiator 130 and the ground radiator 140 are connected in a bent manner in sequence to present a step shape.

[0059] The first radiator 110 includes a first section 112 and a second section 114 connected to each other. In this embodiment, the first section 112 and the second section 114 are coplanar. Figure 1 The second section 114 extends to the upper left of Figure 1 Extends to the lower right.

[0060] The second radiator 120 is connected between the first section 112 and the second section 114 of the first radiator 110 in a bent manner (position A2). In this embodiment, the second radiator 120 is vertically connected between the first section 112 and the second section 114 of the first radiator 110 (position A2). The second radiator 120 includes a third section 122 and a fourth section 124. In this embodiment, the third section 122 and the fourth section 124 are coplanar, and the third section 122 is Figure 1 The fourth section 124 extends horizontally to the upper left of Figure 1 The fourth section 124 includes a feeding end (position A1). In this embodiment, the feeding end (position A1) is electrically connected to a signal positive end of a coaxial transmission line 165.

[0061] The third radiator 130 is connected to the third section 122 of the second radiator 120 in a folded manner, for example vertically. The ground radiator 140 is connected to the third radiator 130 in a folded manner, for example vertically, and the ground end (position G1) is electrically connected to the negative signal end of the coaxial transmission line.

[0062] In this embodiment, the antenna module 100 is, for example, made of an integral iron piece, but is not limited thereto. In other embodiments, the antenna module 100 may also be formed on a flexible printed circuit (FPC) or made on a housing by laser direct structuring (LDS).

[0063] Depend on Figure 1 It can be seen that in this embodiment, the length L1 of the first radiator 110 is about 27 mm. The width L2 is about 1.9 mm. The distance L3 between the first radiator 110 and the ground radiator 140 is about 3 mm. The distance L4 between the second radiator 120 and the ground radiator 140 is about 1.1 mm. The size L5 of the ground radiator 140 is about 5 mm. Of course, the above dimensions are not limited to this.

[0064] It is worth mentioning that in the present embodiment, the antenna module 100 is manufactured by combining iron pieces (first radiator 110, second radiator 120 and third radiator 130) with length, width and thickness of about 27 mm, 6 mm and 0.3 mm, and iron pieces (ground radiator 140) with length, width and thickness of about 8.5 mm, 5 mm and 0.3 mm, and bending them into a three-dimensional ladder shape, and can be set in a space with length, width and height of 27 mm, 3 mm and 4.95 mm respectively. Since the stepped antenna module 100 has a reduced size in width, it can be set in a flat device with a narrow frame. Of course, the type of device to which the antenna module 100 is applied is not limited to this.

[0065] In addition, in this embodiment, the first section 112 of the first radiator 110 and the fourth section 124 of the second radiator 120 (the path formed by the positions A1 to A3) are coupled together to produce a low frequency band. The low frequency band is, for example, 2400 MHz to 2484 MHz (such as WiFi 2.4 GHz), but is not limited thereto. In this embodiment, the length of the first section 112 of the first radiator 110 and the fourth section 124 of the second radiator 120 (the path formed by the positions A1 to A3) is 1 / 4 times the wavelength of the low frequency band.

[0066] The second section 114 of the first radiator 110 and the fourth section 124 of the second radiator 120 (the path formed by the positions A1, A2, and A3) and the second radiator 120, the third radiator 130, and the ground radiator 140 (the path formed by the positions A1, B1, B2, G3, G2, and G1) are coupled together to produce a high frequency band. The high frequency band is, for example, 5150 MHz to 5850 MHz (for example, WiFi 5 GHz), but is not limited thereto. In the present embodiment, the length of the second section 114 of the first radiator 110 and the fourth section 124 of the second radiator 120 is 1 / 4 times the wavelength of the high frequency band, and the length of the second radiator 120, the third radiator 130, and the ground radiator 140 (the path formed by the positions A1, B1, B2, G3, G2, and G1) is 1 / 4 times to 1 / 2 times the wavelength of the high frequency band. Therefore, the antenna module 100 can achieve the required frequency band in a limited space.

[0067] Figure 2 is a schematic diagram of an electronic device according to an embodiment of the present disclosure. Figure 2 In this embodiment, the electronic device 10 is, for example, a tablet computer with a narrow frame, but the present invention is not limited thereto. The electronic device 10 includes two Figure 1 The antenna modules 100 are arranged in a frame area 12 at the outer edge of the display panel 40. The distance L8 between the two antenna modules 100 is between 60 mm and 80 mm, and is about 70 mm.

[0068] Figure 3 yes Figure 2 A schematic top view of an electronic device with two antenna modules disposed on an insulating member. Figure 3 In this embodiment, two antenna modules 100 are arranged on the insulating member 20. Since the two antenna modules 100 are of the same shape, they can share the same mold, thereby achieving the goal of antenna sharing and cost saving. The two antenna modules 100 are respectively welded with two coaxial transmission lines 165 of 50 mm and 150 mm, and are connected to a module card (not shown) of a main board (not shown) through the two coaxial transmission lines 165.

[0069] Figure 4 yes Figure 3 See Figure 4 In this embodiment, the insulating member 20 has a stepped profile. The antenna module 100 is disposed on the insulating member 20 along the profile of the insulating member 20. In this embodiment, the second radiator 120 includes a positioning hole 126 located between the third section 122 and the fourth section 124. The positioning hole 126 can be used to allow a structure such as a bolt 22 to pass through and position the antenna module 100 so as to fix the antenna module 100 on the insulating member 20. In addition, the antenna module 100 can be fixed to the plastic insulating member 20 by hot melting, and has good and stable wireless performance.

[0070] See also Figure 5 , Figure 5 It is along Figure 2 In this embodiment, the electronic device 10 includes an insulating member 20 , an antenna module 100 , a metal back cover 30 , a display panel 40 and a front frame 60 .

[0071] The front frame 60 is disposed beside the display panel 40. In the present embodiment, the width L9 of the front frame 60 is approximately 7.5 mm. The metal back cover 30 is disposed below the display panel 40 and the front frame 60. The display panel 40 is disposed relative to the metal back cover 30. The antenna module 100 and the insulating member 20 are located in the frame area 12 at the outer edge of the display panel 40, and are disposed between the front frame 60 and the metal back cover 30.

[0072] It is worth mentioning that Figure 5 It can be seen that in this embodiment, the first radiator 110 of the antenna module 100 is perpendicular to the display panel 40. Since the side of the tablet device needs to be tested for the specific absorption rate (SAR), if the antenna module 100 is in a planar form, its radiation pattern will be toward Figure 5 The marked Z direction (to the right) is more difficult to meet the test standard. If a planar antenna is to meet the SAR standard, it is often necessary to reduce the antenna transmission power.

[0073] In this embodiment, the antenna module 100 is stepped and the first radiator 110 of the antenna module 100 is perpendicular to the display panel 40. This design can make the radiation pattern face Figure 5 In this way, the designer does not need to reduce the antenna transmission power. Figure 5 The SAR value on the right side of the figure meets the standard and has better performance.

[0074] In addition, in this embodiment, the design of the first radiator 110 of the antenna module 100 being vertically away from the metal back cover 30 can enable the radiation energy of the antenna in the Y direction to have an omnidirectional radiation characteristic.

[0075] It is worth mentioning that please match Figure 1 and Figure 5 In this embodiment, the antenna module 100 further includes an air vent 150, which is formed between the second radiator 120 and the ground radiator 140 and is located next to the third radiator 130. The ground radiator 140 includes a first edge 142 connected to the third radiator 130, a second edge 146 adjacent to the first edge 142, and a notch 144 recessed inward from the first edge 142, wherein the notch 144 is connected to the air vent 150. The length and width of the notch 144 are both 2 mm, for example, but are not limited thereto. The air vent 150 and the notch 144 are used to allow airflow to pass through to improve heat dissipation.

[0076] like Figure 5 As shown, in this embodiment, the metal back cover 30 includes an opening 32 corresponding to and connected to the air outlet 150. Figure 4 and Figure 5 The arrows (indicated by the arrows) are suitable for flowing into or out of the metal back cover 30 through the opening 32 of the metal back cover 30 and the air outlet 150 and the recess 144 of the antenna module 100, thereby achieving a heat dissipation effect.

[0077] Again, please return to Figure 1 In this embodiment, the antenna module 100 further includes a first conductive member 160, which is overlapped with the ground radiator 140 and extends to a system ground plane 50 in a direction away from the third radiator 130. The system ground plane 50 is, for example, a bare copper area of ​​a motherboard, but is not limited thereto. The size L6 of the first conductive member 160 above the ground radiator is approximately 8.5 mm, and the size L7 of the first conductive member 160 outside the ground radiator is approximately 3 mm. The first conductive member 160 is, for example, an aluminum foil or a copper foil, but is not limited thereto.

[0078] The antenna module 100 further includes a second conductive member 162. The grounded radiator 140 includes a second edge 146 adjacent to the first edge 142, and the second edge 146 is close to the feeding end (position A1). The second conductive member 162 overlaps the second edge 146 of the grounded radiator 140 to be grounded. Specifically, the second conductive member 162 overlaps the second edge 146 of the grounded radiator 140 and extends to the metal back cover 30 (indicated at Figure 5 ). Such a design can improve the antenna performance of the antenna module 100 at WiFi 2.4 GHz and WiFi 5 GHz. The second conductive member 162 is, for example, conductive foam, but is not limited thereto.

[0079] In this embodiment, the first conductive element 160 and the second conductive element 162 form two inductive grounds, which increase the antenna grounding area and make the system grounding complete, thereby effectively improving the stability of the wireless transmission system and the wireless transmission performance.

[0080] Figure 6 yes Figure 3 The frequency-return loss relationship of the two antenna modules. Figure 6 In this embodiment, the return loss of the two antenna modules 100 can be below -6dB (VSWR=3), and has a good performance.

[0081] Figure 7 yes Figure 3 The frequency-isolation relationship of the two antenna modules. Figure 3 and Figure 7 , in this embodiment, Figure 3 The distance L8 between the two antenna modules 100 is about 70 mm, and the isolation can be less than -15dB, or even close to -20dB, which has a good isolation performance.

[0082] Figure 8 yes Figure 1 The relationship between frequency and antenna efficiency of two antenna modules on an electronic device. Figure 8 The antenna efficiency of the two antenna modules 100 is above -4.5dBi in both the low-frequency WiFi 2.4GHz and high-frequency WiFi 5GHz, and has good performance.

[0083] Please go back Figure 2 In this embodiment, the electronic device 10 has two Figure 1 In addition to the antenna module 100, two planar antennas 70 may be provided to form a 4x4 MIMO multi-antenna technology application. The two planar antennas 70 are located on both sides of the two antenna modules 100, and the distance L10 between the planar antenna 70 and the antenna module 100 is 20 mm. The planar antenna 70 may be printed on a circuit board and flatly provided in the border area 12. Of course, in other embodiments, the two planar antennas 70 may also be omitted, or the two planar antennas 70 may be replaced by two other antenna modules 100.

[0084] Fig. 9 and Fig.10 They are Figure 1 The antenna module and planar antenna of the electronic device are shown in the XY plane at low and high frequencies. Fig. 9 At low frequencies (at WiFi 2.4 GHz), the antenna module 100 has a better radiation pattern in the +Y direction. Fig.10At high frequencies (the frequency point is at WiFi 5 GHz), the antenna module 100 has a better radiation pattern in the +X and -X directions.

[0085] In summary, the second radiator of the antenna module disclosed in the present invention is connected to the portion between the first section and the second section of the first radiator in a bendable manner, and the fourth section of the second radiator includes a feed end. The third radiator is connected to the third section of the second radiator in a bendable manner, and the ground radiator is connected to the third radiator in a bendable manner. The first radiator, the second radiator, the third radiator and the ground radiator are connected in a bendable manner in sequence to present a stepped shape. Through the above design, the antenna module disclosed in the present invention can reduce the length and width dimensions and can be used in an environment with limited space. In addition, the first section of the first radiator and the fourth section of the second radiator are coupled together to produce a low-frequency band, and the second section of the first radiator and the fourth section of the second radiator as well as the second radiator, the third radiator and the ground radiator are coupled together to produce a high-frequency band, and the required frequency band can be achieved in a limited space.

Claims

1. An antenna module, characterized in that: include: A first radiator, comprising a first section and a second section connected to each other; A second radiator connected to the first radiator, the second radiator comprising a third section and a fourth section connected to each other, and the fourth section comprising a feeding end; a third radiator connected to the third section of the second radiator; a grounded radiator connected to the third radiator, wherein the first radiator, the second radiator, the third radiator and the grounded radiator are connected in a bent manner in sequence to present a step-like shape, the first section of the first radiator and the fourth section of the second radiator are coupled together to produce a low frequency band, and the second section of the first radiator, the second radiator, the third radiator and the grounded radiator are coupled together to produce a high frequency band; the grounded radiator comprises a first edge connected to the third radiator and a second edge adjacent to the first edge, and the second edge and the feeding end are located on the same side; a first conductive element, connected to the ground radiator and extending in a direction away from the third radiator to a system ground plane; and A second conductive element is connected to the second edge of the grounded radiator to be grounded.

2. The antenna module according to claim 1, characterized in that: The length of the first section of the first radiator and the fourth section of the second radiator is 1 / 4 times the wavelength of the low frequency band.

3. The antenna module according to claim 1, wherein: The length of the second section of the first radiator and the fourth section of the second radiator is 1 / 4 times the wavelength of the high frequency band.

4. The antenna module according to claim 1, wherein: The lengths of the second radiator, the third radiator and the ground radiator are 1 / 4 to 1 / 2 times the wavelength of the high frequency band.

5. The antenna module according to claim 1, wherein: The antenna module includes an air outlet, which is formed between the second radiator and the ground radiator and is located beside the third radiator.

6. The antenna module according to claim 5, characterized in that: The grounded radiator includes a first edge connected to the third radiator and a notch recessed inward from the first edge, and the notch is connected to the air outlet.

7. An electronic device, characterized in that: include: an insulating member having a stepped profile; An antenna module as claimed in any one of claims 1 to 6, being disposed on the insulating member in a manner conforming to the contour of the insulating member; and A metal back cover, the insulating component and the antenna module are configured in the metal back cover.

8. The electronic device as claimed in claim 7, characterized in that: Also includes: A display panel is arranged relative to the metal back cover, the insulating member and the antenna module are located in a frame area at the outer edge of the display panel, and the first radiator of the antenna module is perpendicular to the display panel.

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