antenna module

Abstract

An antenna module includes a first antenna, a second antenna, a first ground plane, a third antenna, and a second ground plane. The first ground plane is located between and connected to the first and second antennas, and has a first groove proximate to the first antenna. The second antenna is located between the first and third antennas, and the first antenna extends in a direction that is not parallel to that of the second antenna, and the second antenna extends in a direction that is not parallel to that of the third antenna. The second ground plane is located between and connected to the second and third antennas, and is separate from the second antenna and the first ground plane. The second ground plane has a second groove.

Description

Technical Field

[0001] The present invention relates to an antenna module, and in particular to an antenna module with good isolation between antennas and good antenna efficiency. Background Art

[0002] Fifth-generation mobile communications (5G) will require multiple antennas to be arranged along the same axis. Ensuring good isolation and antenna efficiency between these antennas is a research goal in this field. Summary of the Invention

[0003] The present invention provides an antenna module, which has good isolation and antenna efficiency between antennas.

[0004] An antenna module according to the present invention includes a first antenna, a second antenna, a first ground plane, a third antenna, and a second ground plane. The first ground plane is located between and connected to the first and second antennas, and has a first groove proximate to the first antenna. The second antenna is located between the first and third antennas, and the first antenna extends in a direction that is not parallel to that of the second antenna, and the second antenna extends in a direction that is not parallel to that of the third antenna. The second ground plane is located between and connected to the second and third antennas, and is separate from the second antenna and the first ground plane. The second ground plane has a second groove.

[0005] In one embodiment of the present invention, the antenna module further includes a first retaining wall and a second retaining wall. The first retaining wall is disposed perpendicularly to the first ground plane near the first groove and is electrically conductive to the first ground plane. The second retaining wall is disposed perpendicularly to the first ground plane near the second antenna and is electrically conductive to the first ground plane. The first and second antennas are located on either side of the first and second retaining walls.

[0006] In one embodiment of the present invention, the antenna module further includes a metal member disposed on one side of the first ground plane and separated from the first ground plane. The second ground plane extends to the metal member. The first ground plane is connected to the metal member via a conductive member.

[0007] In one embodiment of the present invention, the first retaining wall is located between the first antenna and the first groove, or the first groove is located between the first antenna and the first retaining wall.

[0008] In one embodiment of the present invention, the second antenna includes a main radiator and a secondary radiator. The main radiator and the secondary radiator are separated from each other and are both connected to the first ground plane. The secondary radiator is close to the feeding end of the main radiator, and the main radiator and the secondary radiator extend in different directions.

[0009] In one embodiment of the present invention, the angle between the extension direction of the first antenna and the extension direction of the main radiator of the second antenna is between 45 and 75 degrees, and the angle between the extension direction of the main radiator of the second antenna and the extension direction of the third antenna is between 45 and 75 degrees.

[0010] In one embodiment of the present invention, an extending direction of the first trench is parallel to an extending direction of the second trench.

[0011] In one embodiment of the present invention, the length of the first groove is between 12 mm and 15 mm, the width of the first groove is between 4 mm and 6 mm, the length of the second groove is between 22 mm and 26 mm, and the width of the second groove is between 0.5 mm and 1.5 mm.

[0012] In one embodiment of the present invention, the distance between the first antenna and the second antenna is between 80 mm and 100 mm, and the distance between the second antenna and the third antenna is between 15 mm and 20 mm.

[0013] In one embodiment of the present invention, the antenna module further includes a fourth antenna and a third ground plane. The first antenna is located between the fourth antenna and the second antenna, and the fourth antenna extends in a direction different from the direction of the first antenna. The third ground plane is located between the fourth antenna and the first antenna and has a third groove.

[0014] Based on the above, the antenna module of the present invention extends in a direction that is not parallel to the direction of the second antenna, and the direction of the second antenna extending in a direction that is not parallel to the direction of the third antenna extending in a direction. Furthermore, the first ground plane between the first and second antennas has a first groove, and the second ground plane between the second and third antennas has a second groove. This configuration effectively increases the isolation between the first, second, and third antennas, and ensures good antenna efficiency for the first, second, and third antennas. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 yes Figure 1 A schematic cross-sectional view of a main body of an electronic device.

[0017] Figure 3 FIG. 1 is a schematic top view of an antenna module according to an embodiment of the present invention.

[0018] Figure 4 It is along Figure 1 Schematic diagram of the cross section of the AA line segment.

[0019] Figure 5 yes Figure 3 Frequency-VSWR relationship diagram of the antenna module.

[0020] Figure 6 yes Figure 3 Frequency-isolation relationship diagram of the antenna module.

[0021] Figure 7 yes Figure 3 The frequency-antenna efficiency relationship diagram of the antenna module.

[0022] Figure 8 FIG. 1 is a schematic top view of an antenna module according to another embodiment of the present invention.

[0023] The description of the accompanying drawings is as follows:

[0024] θ1, θ2: angle

[0025] A1~A8, B1~B6, C1~C2: Location

[0026] D1, D2, D3: extension direction

[0027] L1, L7, L9, L12: thickness

[0028] L2, L5, L17: Height

[0029] L3, L4, L13, L14: Width

[0030] L6, L8, L11, L15, L16: distance

[0031] L10: Length

[0032] X, Y, Z: coordinates

[0033] 10: Electronic devices

[0034] 20: Main body

[0035] 22: Low-frequency speaker cavity

[0036] 24: High-frequency speaker cavity

[0037] 26: Low frequency speaker

[0038] 30: Screen

[0039] 50: Substrate

[0040] 60: Shielding shell

[0041] 100, 100a: Antenna module

[0042] 110: First antenna

[0043] 120: Second Antenna

[0044] 122: Main radiator

[0045] 124: Secondary radiator

[0046] 130: First ground contact surface

[0047] 132: First groove

[0048] 140: Third antenna

[0049] 142: Copper foil

[0050] 150: Second ground plane

[0051] 152: Second groove

[0052] 160: First retaining wall

[0053] 162: Second retaining wall

[0054] 163, 164: Conductive parts

[0055] 165: Metal parts

[0056] 165a: Vertical board

[0057] 165b: Horizontal plate

[0058] 170: Fourth Antenna

[0059] 180: Third ground plane

[0060] 182: Third groove DETAILED DESCRIPTION

[0061] Figure 1 is a schematic diagram of an electronic device according to an embodiment of the present invention. Figure 2 yes Figure 1 Another perspective diagram of the main body of the electronic device. It should be noted that in order to clearly show the relevant structure of the antenna module, Figure 1 and Figure 2 In the figure, the antenna module related structure is represented by solid lines. In addition, Figure 2 Only the main body is shown, omitting the screen.

[0062] See also Figure 1 and Figure 2 In this embodiment, the electronic device 10 is a smart speaker, but the type of electronic device 10 is not limited to this. The electronic device 10 includes a main body 20 and a screen 30. The screen 30 is slightly higher than the bottom of the main body 20, and the height L2 ( Figure 1 ) is greater than or equal to 15 mm, but is not limited to this.

[0063] like Figure 2 As shown, the main body 20 includes a low-frequency speaker cavity 22 located in the center, low-frequency speakers 26 located on both sides (with a width L4 of approximately 20 mm), and a high-frequency speaker cavity 24 located at the bottom.

[0064] In this embodiment, since the screen 30 has a narrow frame, there is no extra space for the antenna module 100 ( Figure 3 ) configuration, so that the antenna module 100 needs to be set in the main body 20. The thickness L1 of the main body 20 ( Figure 1 ) is approximately 47 mm, width L3 is approximately 240 mm, and height L5 is approximately 120 mm. Within this small main body 20, the antenna module 100 is uniquely designed to achieve excellent isolation and antenna efficiency. The structure of the antenna module 100 will be described in detail below.

[0065] Figure 3 FIG. 1 is a schematic top view of an antenna module according to an embodiment of the present invention. Figure 4 It is along Figure 1 The cross-sectional diagram of the AA line segment is shown in FIG. Figure 4 Also for Figure 3 side view. Figure 3 and Figure 4 The relative position can be referred to the coordinates XYZ.

[0066] See also Figure 3 and Figure 4 In this embodiment, the antenna module 100 is disposed on a substrate 50 and includes a first antenna 110, a second antenna 120, a first ground plane 130, a third antenna 140, and a second ground plane 150. The substrate 50 is, for example, a motherboard ( Figure 3 Only a portion of the substrate is shown, but the present invention is not limited thereto.

[0067] In this embodiment, the first antenna 110 is a Bluetooth antenna with a feed point at position B1. The antenna extends from position B1 to position B2 to form a PIFA antenna structure, generating a single-band (2.4 GHz) resonant frequency. The dimensions of the first antenna 110 are, but are not limited to, 4 mm in width and 30 mm in length.

[0068] The second antenna 120 is the Wi-Fi Main antenna, with a feed point at location B3. The second antenna 120 includes a main radiator 122 (located at locations B3 and B4) and a secondary radiator 124 (located at locations C1 and C2). The main radiator 122 and the secondary radiator 124 are separated from each other and both connected to the first ground plane 130. The secondary radiator 124 is located near the feed point of the main radiator 122 and extends in different directions.

[0069] The main radiator 122 and the secondary radiator 124 together form an open-loop antenna structure. Adjusting the path lengths C1 and C2 adjusts the impedance matching bandwidth and resonant frequency of the WiFi 2.4GHz signal. The length L10 between locations C1 and C2 is 17 mm, but this is not a limitation. The main radiator 122 of the WiFi Main antenna is 20 mm wide and 35 mm long, but this is not a limitation.

[0070] The third antenna 140 is a Wi-Fi AUX antenna, fed into point B5. A path from point B5 to point B6 forms a PIFA antenna structure, generating dual-band antenna characteristics. Adjusting the lengths of paths B5 and B6 adjusts the resonant frequency of Wi-Fi 2.4 GHz. The width L13 of the third antenna 140 is 7 to 8 mm, and its length is 25 mm, but this is not a limitation.

[0071] In this embodiment, the second antenna 120 is located between the first antenna 110 and the third antenna 140 . The extension direction D1 of the first antenna 110 is not parallel to the extension direction D2 of the second antenna 120 . The extension direction D2 of the second antenna 120 is not parallel to the extension direction D1 of the third antenna 140 .

[0072] Specifically, the angle θ1 between the extension direction D1 of the first antenna 110 and the extension direction D2 of the main radiator 122 of the second antenna 120 is between 45 and 75 degrees, but is not limited thereto. The angle θ1 between the extension direction D2 of the main radiator 122 of the second antenna 120 and the extension direction D1 of the third antenna 140 is between 45 and 75 degrees, but is not limited thereto. Furthermore, the extension direction of the first antenna 110 may not be parallel to the extension direction of the third antenna 140, not being limited by the diagram.

[0073] With the above configuration, even if the distance between the first antenna 110 and the second antenna 120 (between 80 mm and 100 mm) and the distance between the second antenna 120 and the third antenna 140 (between 15 mm and 20 mm) are very small, the first antenna 110, the second antenna 120, and the third antenna 140 can still have good isolation from each other.

[0074] In addition, by Figure 3 As can be seen, the first ground plane 130 is located between and connected to the first antenna 110 and the second antenna 120. The length of the first ground plane 130 is approximately 100 mm to 110 mm, and the width L14 is approximately 40 mm, but not limited thereto.

[0075] The first ground plane 130 has a first groove 132 located near the first antenna 110. The first groove 132 is surrounded by positions A1, A2, A3, and A4. In this embodiment, the length of the first groove 132 is between 12 mm and 15 mm, for example, 14.6 mm or 12.8 mm, but is not limited thereto. The width of the first groove 132 is between 4 mm and 6 mm, for example, 4.9 mm, but is not limited thereto.

[0076] In this embodiment, the second antenna 120 is separated from the third antenna 140. The distance L11 between the second antenna 120 and the third antenna 140 is 17.5 mm, but this is not limiting. The second ground plane 150 is located between the second antenna 120 and the third antenna 140 and is connected to the third antenna 140. The third antenna 140 and the second ground plane 150 are connected by a copper foil 142. The thickness L12 of the copper foil 142 is 0.5 mm, and the height L17 of the copper foil 142 is 0.5 mm. Figure 4 ) is 6 mm, but not limited to this.

[0077] The second ground plane 150 is separated from the second antenna 120 and the first ground plane 130. The distance L16 between the second ground plane 150 and the first ground plane 130 is ( Figure 4 ) is 5 mm. The second ground plane 150 is, for example, a copper foil. The second ground plane 150 has a second groove 152. The extension direction D1 of the first groove 132 is parallel to the extension direction D1 of the second groove 152.

[0078] The second groove 152 is surrounded by positions A5, A6, A7, and A8. In this embodiment, the length of the second groove 152 ranges from 22 mm to 26 mm, for example, 24 mm. The width of the second groove 152 ranges from 0.5 mm to 1.5 mm, for example, 1 mm, but is not limited thereto. Adjusting the size of the second groove 152 can adjust the isolation between the second antenna 120 and the third antenna 140.

[0079] In the antenna module 100 of this embodiment, the first ground plane 130 located between the first antenna 110 and the second antenna 120 has a first groove 132, and the second ground plane 150 located between the second antenna 120 and the third antenna 140 has a second groove 152. Experiments have shown that this configuration further increases the isolation between the first antenna 110, the second antenna 120, and the third antenna 140.

[0080] In addition, the antenna module 100 further includes a first retaining wall 160 and a second retaining wall 162. In this embodiment, the first retaining wall 160 and the second retaining wall 162 are made of conductive foam, but the types of the first retaining wall 160 and the second retaining wall 162 are not limited thereto.

[0081] The first retaining wall 160 is disposed perpendicularly to the first ground plane 130 near the first groove 132 and is electrically conductive to the first ground plane 130. The distance L6 between the first antenna 110 and the first retaining wall 160 is 9 mm, and the thickness L7 of the first retaining wall 160 is between 2 mm and 3 mm, but this is not limiting. In this embodiment, the first retaining wall 160 is located between the first antenna 110 and the first groove 132, for example, at positions A1 and A2. In other embodiments, the first groove 132 may also be located between the first antenna 110 and the first retaining wall 160, for example, at positions A3 and A4.

[0082] The second retaining wall 162 is vertically disposed on the first ground plane 130 near the second antenna 120 and is electrically connected to the first ground plane 130. The thickness L9 of the second retaining wall 162 is 2 mm to 3 mm, but is not limited thereto.

[0083] The first antenna 110 and the second antenna 120 are located on either side of the first and second retaining walls 160, 162. The first and second retaining walls 160, 162 serve to concentrate radiated energy, reduce interference between the antennas, and block noise sources (not shown) on the substrate 50 (motherboard) from affecting wireless transmission. In this embodiment, the distance L8 between the first and second retaining walls 160, 162 is 90 to 92 mm, but this is not a limitation.

[0084] Furthermore, in this embodiment, the antenna module 100 further includes a metal member 165 disposed on one side of the first ground plane 130 and separated from the first ground plane 130. In this embodiment, the metal member 165 is a heat sink of the electronic device 10 and can serve as a system ground plane. Figure 1 It can be seen that the metal member 165 includes a vertical plate 165 a and a horizontal plate 165 b , but the shape of the metal member 165 is not limited thereto.

[0085] like Figure 4 As shown, a shielding shell 60 is disposed between the horizontal plate 165b of the metal member 165 and the first ground plane 130. The shielding shell 60 is approximately 2 to 3 mm thick, but this is not limiting. The substrate 50, which includes the first ground plane 130, is positioned on the shielding shell 60, which is in turn positioned on the metal member 165. The shielding shell 60 has openings for connecting the first ground plane 130 to the metal member 165 via vias 163 and 164. The substrate 50 can be connected to the metal member 165 via vias 163 and 164 using screws (not shown) or internal vias, thereby enhancing the system's grounding effectiveness.

[0086] Furthermore, the second ground plane 150 extends to the metal member 165 , and the distance L15 between the third antenna 140 and the metal member 165 is 16 mm, but is not limited thereto.

[0087] Figure 5 yes Figure 3 The frequency-VSWR relationship diagram of the antenna module. Figure 5 In this embodiment, the VSWR values ​​of the first antenna 110 , the second antenna 120 , and the third antenna 140 in the frequency bands between 2400 MHz and 2500 MHz and 5150 MHz and 5875 MHz are less than 3, and thus have good performance.

[0088] Figure 6 yes Figure 3 The frequency-isolation relationship of the antenna module. Figure 6 In this embodiment, the isolation between the second antenna 120 and the third antenna 140 is -15dB, and the isolation between the first antenna 110 and the second antenna 120, as well as the isolation between the first antenna 110 and the third antenna 140, is even lower than -25dB. Compared to conventional designs where the first antenna 110 and the second antenna 120 are arranged parallel to each other and lack the first slot 132, where the isolation between the first antenna 110 and the second antenna 120 is only -10dB, the antenna module 100 of this embodiment demonstrates excellent isolation performance.

[0089] Figure 7 yes Figure 3 The frequency-antenna efficiency relationship of the antenna module. Figure 7 In this embodiment, the low-frequency antenna efficiency of the first antenna 110 is -1.9dBi to -2.6dBi, and the high-frequency antenna efficiency is -2.4dBi to -3.4dBi. The low-frequency efficiency of the second antenna 120 is -2.0dBi to -2.2dBi, and the high-frequency antenna efficiency is -1.4dBi to -2.1dBi. The low-frequency efficiency of the third antenna 140 is -1.6dBi to -1.7dBi, and the high-frequency antenna efficiency is -0.9dBi to -2.0dBi. In other words, the antenna efficiency in both the 2.4GHz and 5GHz frequency bands can be greater than -3.5dBi, providing excellent performance. In addition, in this embodiment, the envelope correlation coefficient (ECC) of any two antennas can be within 0.1, providing excellent performance.

[0090] In addition, when the existing 5G technology Sub 6G antenna supports 4x4 MIMO multi-antenna configuration, these antennas can Figure 8 way to arrange them. Figure 8 FIG is a top view of an antenna module according to another embodiment of the present invention. Figure 8The antenna module 100a further includes a fourth antenna 170 and a third ground plane 180. The first antenna 110 is located between the fourth antenna 170 and the second antenna 120. The extension direction D3 of the fourth antenna 170 is non-parallel to the extension direction D1 of the first antenna 110. The angle θ2 between the extension direction D3 of the fourth antenna 170 and the extension direction D1 of the first antenna 110 is, for example, between 30 degrees and 75 degrees.

[0091] The third ground plane 180 is located between the fourth antenna 170 and the first antenna 110. The third ground plane 180 is, for example, a copper foil. The fourth antenna 170 extends through the third ground plane 180 to the metal component 165 to connect to the system ground plane. The third ground plane 180 has a third groove 182.

[0092] In this embodiment, the first antenna 110 and the second antenna 120 can be printed on the substrate 50 ( Figure 3 ) and connected to the metal component 165 via the first ground plane 130. The third antenna 140 and the fourth antenna 170 can be connected to the metal component 165 via the second ground plane 150 and the third ground plane 180 (independent small circuit boards or copper foil) and transmission lines. This configuration ensures good isolation and antenna efficiency for the first antenna 110 and the fourth antenna 170.

[0093] In summary, the antenna module of the present invention extends in a direction that is non-parallel to the direction of the second antenna, which in turn extends in a direction that is non-parallel to the direction of the third antenna. Furthermore, the first ground plane between the first and second antennas has a first groove, and the second ground plane between the second and third antennas has a second groove. This configuration effectively increases the isolation between the first, second, and third antennas, and ensures good antenna efficiency for each of the three antennas.

Claims

1. An antenna module, characterized in that: include: a first antenna; One and two antennas; a first ground plane located between the first antenna and the second antenna and connected to the first antenna and the second antenna, the first ground plane having a first groove close to the first antenna; a third antenna, the second antenna being located between the first antenna and the third antenna, the first antenna extending in a direction not parallel to the second antenna extending in a direction not parallel to the third antenna extending in a direction; a second ground plane located between the second antenna and the third antenna and connected to the third antenna, the second ground plane being separated from the second antenna and the first ground plane, and having a second groove; a first retaining wall, vertically disposed on the first ground plane near the first groove and conductive to the first ground plane; as well as A second retaining wall is vertically disposed on the first ground plane near the second antenna and is connected to the first ground plane. The first antenna and the second antenna are located on both sides of the first retaining wall and the second retaining wall.

2. The antenna module according to claim 1, wherein: Also includes: A metal piece is disposed on one side of the first ground plane and is separated from the first ground plane. The second ground plane extends to the metal piece. The first ground plane is connected to the metal piece through a conductive piece.

3. The antenna module according to claim 1, wherein: The first retaining wall is located between the first antenna and the first groove, or the first groove is located between the first antenna and the first retaining wall.

4. The antenna module according to claim 1, wherein: The second antenna includes a main radiator and a secondary radiator. The main radiator and the secondary radiator are separated from each other and connected to the first ground plane. The secondary radiator is close to the feeding end of the main radiator and extends in different directions.

5. The antenna module according to claim 4, wherein: An included angle between an extension direction of the first antenna and an extension direction of the main radiator of the second antenna is between 45 and 75 degrees. An included angle between an extension direction of the main radiator of the second antenna and an extension direction of the third antenna is between 45 and 75 degrees.

6. The antenna module according to claim 1, wherein: An extending direction of the first trench is parallel to an extending direction of the second trench.

7. The antenna module according to claim 1, wherein: The length of the first groove is between 12 mm and 15 mm, the width of the first groove is between 4 mm and 6 mm, the length of the second groove is between 22 mm and 26 mm, and the width of the second groove is between 0.5 mm and 1.5 mm.

8. The antenna module according to claim 1, wherein: The distance between the first antenna and the second antenna is between 80 mm and 100 mm, and the distance between the second antenna and the third antenna is between 15 mm and 20 mm.

9. The antenna module according to claim 1, wherein: Also includes: a fourth antenna, the first antenna being located between the fourth antenna and the second antenna, and the fourth antenna extending in a direction different from the first antenna extending in a direction; as well as A third ground plane is located between the fourth antenna and the first antenna, and the third ground plane has a third groove.

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