Antenna module and electronic device

Abstract

An antenna module includes a first radiator, a second radiator, a planar radiator and a ground radiator. The first radiator includes a feed-in portion, a connecting portion, a first portion and a second portion extending in different directions from the feed-in portion, the first portion and the second portion surrounding a loop, a first slot being formed between the first portion and the second portion, and the connecting portion protruding from the first portion. The second radiator is disposed beside the first portion and is bent corresponding to the shape of the first portion. The planar radiator is connected to the second radiator and is disposed beside the first portion and the second portion. The planar radiator forms a gap with the first portion and the second portion, respectively. The connecting portion is connected to the planar radiator across the gap. The ground radiator is disposed adjacent to the feed-in portion.

Description

TECHNICAL FIELD

[0001] The present application relates to an antenna module and an electronic device, in particular, to a wideband antenna module and an electronic device. BACKGROUND

[0002] Nowadays, the LoRa low power wide area network (LPWAN) technology is used in wireless communication devices or physical lines in industry and commerce, which can be used for wireless transmission in 433MHz, 868MHz and 915MHz low frequency bands, and has the characteristics of small data volume, long distance transmission and power saving. However, due to the small size and low cost design consideration, the antenna of the small Internet of Things wireless communication device is difficult to achieve the full frequency band of low frequency. SUMMARY

[0003] The purpose of the present application is to provide an antenna module that achieves the full frequency band of low frequency.

[0004] The present application provides an electronic device with the above-mentioned antenna module.

[0005] An antenna module of the present application includes a first radiator, a second radiator, a planar radiator and a ground radiator. The first radiator includes a feed-in portion, a connecting portion, a first portion and a second portion extending in different directions from the feed-in portion, the first portion and the second portion surrounding a ring shape, a first slot formed between the first portion and the second portion, and the connecting portion protruding from the first portion. The second radiator is arranged beside the first portion and is bent corresponding to the shape of the first portion. The planar radiator is connected to the second radiator and arranged beside the first portion and the second portion, and the planar radiator respectively forms a gap with the first portion and the second portion, and the connecting portion connects to the planar radiator through the gap. The ground radiator is arranged adjacent to the feed-in portion.

[0006] An electronic device of the present application includes a circuit board and at least one antenna module. The circuit board includes a system ground plane. At least one antenna module is arranged above the circuit board, and each antenna module includes a first radiator, a second radiator, a planar radiator and a ground radiator. The first radiator includes a feed-in portion, a connecting portion, a first portion and a second portion extending in different directions from the feed-in portion, the first portion and the second portion surrounding a ring shape, a first slot formed between the first portion and the second portion, and the connecting portion protruding from the first portion. The second radiator is arranged beside the first portion and is bent corresponding to the shape of the first portion. The planar radiator is connected to the second radiator and arranged beside the first portion and the second portion, and the planar radiator respectively forms a gap with the first portion and the second portion, and the connecting portion connects to the planar radiator through the gap. The ground radiator is arranged adjacent to the feed-in portion and connected to the system ground plane.

[0007] In one embodiment of the present application, the at least one antenna module includes a plurality of antenna modules, which are located above the system ground plane, and the projections of the antenna modules on the system ground plane are located at the corners of the system ground plane.

[0008] In one embodiment of the present application, the at least one antenna module includes a plurality of antenna modules, which are located at the periphery of the system ground plane, and the axes of the annular shapes of the antenna modules are perpendicular to the normal of the system ground plane.

[0009] In one embodiment of the present application, the first portion has a notch toward the planar radiator, and the first portion is divided into a wide section and a narrow section, and a second radiator is located in the notch, and a second slot is formed between the first portion, the second radiator, and the planar radiator.

[0010] In one embodiment of the present application, a third slot is formed between the ground radiator and the first radiator.

[0011] In one embodiment of the present application, the electronic device further includes a battery pack disposed between the circuit board and the antenna modules, and the ground radiator is connected to the system ground plane across the battery pack.

[0012] In one embodiment of the present application, the antenna module excites a frequency band, and the length of the ground radiator is greater than 50 mm and less than or equal to 1 / 4 of the wavelength of the frequency band.

[0013] Based on the above, the first portion and the second portion of the first radiator of the antenna module of the present application extend in different directions from the feed portion and surround annular shapes, and a first slot is formed between the first portion and the second portion. A second radiator is disposed beside the first portion and bends along the shape of the first portion. A planar radiator is connected to the second radiator in a bent manner and is disposed beside the first portion and the second portion, and the planar radiator forms gaps with the first portion and the second portion, respectively, and the connection portion of the first radiator is connected to the planar radiator across the gaps. The ground radiator is close to the feed portion. Such a design can make the antenna module resonate at low frequencies (especially the full frequency band of low frequencies) and high frequencies, thereby having a wide frequency effect. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a perspective view of an electronic device according to one embodiment of the present application.

[0015] Figure 2 is Figure 1 is a partial perspective view of the electronic device of

[0016] Figure 3 is Figure 1 is a partial perspective view of the antenna module of the electronic device of

[0017] Figure 4 is Figure 1 a plan view of an antenna module of an electronic device.

[0018] Figure 5 is Figure 1 a frequency-VSWR graph of an antenna module of an electronic device.

[0019] Figure 6 is a frequency-antenna efficiency graph of an antenna module with a ground radiator at different lengths L5.

[0020] Figure 7 is a plan view of a plurality of antenna modules and a system ground plane according to an embodiment of the present application.

[0021] Figure 8 is a plan view of a plurality of antenna modules and a system ground plane according to another embodiment of the present application.

[0022] Reference numerals are as follows:

[0023] A1 to A5, B1, B2, G, G1 to G4, O: positions

[0024] D1: axis

[0025] D2: normal line

[0026] E: gap

[0027] L1, L5: length

[0028] L2, L3: diameter

[0029] L4: height

[0030] L6: width

[0031] S1: first slot

[0032] S2: second slot

[0033] S3: third slot

[0034] 10: electronic device

[0035] 12: circuit board

[0036] 14: system ground plane

[0037] 20: battery pack

[0038] 30: support

[0039] 40: metal base

[0040] 50: coaxial transmission line

[0041] 100: antenna module

[0042] 110 first radiator

[0043] 111 first portion

[0044] 112 notch

[0045] 113 wide section

[0046] 114 narrow section

[0047] 117 second portion

[0048] 120 second radiator

[0049] 130 planar radiator

[0050] 140 grounded radiator DETAILED DESCRIPTION

[0051] Figure 1 is a perspective view of an electronic device according to an embodiment of the present application. Referring to FIG. 1, an electronic device 10 is shown. In this embodiment, the electronic device 10 is a small Internet of Things (IoT) device, and is designed to be upright, but the type and form of the electronic device 10 are not limited thereto. In this embodiment, the electronic device 10 includes a circuit board 12, a battery pack 20, a bracket 30, a metal base 40, a coaxial transmission line 50, and an antenna module 100. Figure 1 The circuit board 12 is disposed on the metal base 40, and includes a system ground plane 14. The battery pack 20 is disposed on the circuit board 12, the bracket 30 is disposed on the battery pack 20, and the antenna module 100 is disposed on the bracket 30, such that the battery pack 20 is disposed between the antenna module 100 and the circuit board 12. The coaxial transmission line 50 connects the antenna module 100 and the circuit board 12. In this embodiment, the metal base 40 can be attached to a wall or a metal sheet, so as to avoid the wireless transmission characteristics of the antenna module 100 being affected by surrounding metal when the electronic device 10 is placed arbitrarily by a user.

[0052] As shown in FIG. 2, the electronic device 10 includes a first portion 111, a second portion 117, a first radiator 110, a second radiator 120, a notch 112, a wide section 113, and a narrow section 114.

[0053] Figure 1 As shown in FIG. 2, the electronic device 10 includes a first portion 111, a second portion 117, a first radiator 110, a second radiator 120, a notch 112, a wide section 113, and a narrow section 114.

[0054] ​In the present embodiment, the antenna module 100 has a special design to have a wideband characteristic. Specifically, the low frequency of the antenna module 100 can cover the 5G Sub-6G / LoRa (617MHz~960MHz) frequency band, the high frequency can cover the 5G Sub-6G n77~n79 (1710MHz~5925MHz) frequency band, and it is a UWB antenna architecture. The antenna module 100 will be described below.

[0055] Figure 2 is a partial perspective view of an electronic device. Figure 1 Figure 3 is a partial perspective view of an antenna module of an electronic device. Figure 1 Figure 4 is a flattened view of an antenna module of an electronic device. It is to be noted that Figure 1 Figure 2 and Figure 3 hides the ground radiation body 140. Please refer to Figure 2 to Figure 4 In the present embodiment, the antenna module 100 includes a first radiation body 110 (positions A5, A1, A2, O, A3, A4), a second radiation body 120 (positions B1, B2), a planar radiation body 130, and a ground radiation body 140 (positions G1, G, G2, G4, G3). Figure 4

[0056] As can be seen from Figure 4 , the first radiation body 110 (positions A5, A1, A2, O, A3, A4) includes a feeding portion (position A1), a connecting portion (position O), a first portion 111 (positions A1, A2, A3, A4) and a second portion 117 (positions A1, A5) extending in different directions from the feeding portion (position A1). The connecting portion (position O) protrudes from the first portion 111. The first portion 111 has a notch 112 facing the planar radiation body 130, which divides the first portion 111 into a wide section 113 and a narrow section 114. The second radiation body 120 (positions B1, B2) is disposed beside the narrow section 114 of the first portion 111 and located within the notch 112.

[0057] As shown in Figure 3 , the first portion 111 and the second portion 117 surround a ring shape, and a first slot S1 is formed between the first portion 111 and the second portion 117. In the present embodiment, the first slot S1 is about 6.5mm. In addition, the second radiation body 120 (positions B1, B2) is curved corresponding to the shape of the narrow section 114 of the first portion 111.

[0058] As can be seen from Figure 4 ​​​​As can be seen, a second slot S2 is formed between the first part 111 at positions A2, A3, A4 and the second radiator 120 (positions B1, B2) and the planar radiator 130. The second slot S2 is similar to a J-shape, but is not limited thereto.

[0059] Please return Figure 3 The planar radiator 130 is vertically connected to the second radiator 120 at position B1 and is disposed next to the first portion 111 and the second portion 117. A gap E is formed between the planar radiator 130 and the first portion 111 and the second portion 117, respectively. The connecting portion (position O) is connected to the planar radiator 130 across the gap E.

[0060] In this embodiment, the planar radiator 130 is circular, but in other embodiments, the planar radiator 130 may also be elliptical, rectangular, rectangular or hexagonal, and the shape of the planar radiator 130 is not limited thereto.

[0061] like Figure 4 As shown, the ground radiator 140 (positions G1, G, G2, G4, G3) is located near the feed section (position A1). A third slot S3 is formed between the ground radiator 140 and the first radiator 110. In this embodiment, the first slot S1 is approximately 3 mm. Furthermore, the positive end of the coaxial transmission line 50 is connected to the feed section (position A1), and the negative end of the coaxial transmission line 50 is connected to the ground terminal (position G) of the ground radiator 140. The ground terminal is connected to the grounding point via the ground radiator 140. Figure 1 The system ground plane 14 of the circuit board 12.

[0062] In this embodiment, the antenna module 100 can resonate through the above-mentioned totem to create an ultra-wideband antenna architecture that covers the low-frequency band of 617-960MHz and the high-frequency band of 1710-5925MHz.

[0063] Specifically, in antenna module 100, the paths formed by positions A1, A2, and O through the planar radiator 130 and positions B1 and B2, and the path formed by positions A1, A2, A3, and A4, are coupled through a second slot S2, thus resonating a low-frequency resonant band. These two paths can adjust the impedance matching of the two resonant bands: the low-frequency band of 617MHz–700MHz and the low-frequency band of 700MHz–960MHz, respectively. Therefore, antenna module 100 in this embodiment can cover the entire low-frequency band.

[0064] Furthermore, in the antenna module 100, the length and width of the path formed by positions A1, A2, A3, and A4 can determine the impedance matching and frequency resonance point location in the mid-to-high frequency resonant band (1710MHz~2700MHz).

[0065] In addition, in the antenna module 100, the length and width of the path formed by positions A1 and A5, and the width of the first slot S1 between position A5 and positions B1 and A4 determine the impedance matching and frequency resonance point position in the 3300MHz to 5000MHz frequency band.

[0066] Furthermore, in the antenna module 100, the width of the feed section (position A1) and the width of the third slot S3 between the feed section (position A1) and the ground terminal (position G) determine the impedance matching and frequency resonance point position in the 5150MHz to 5925MHz frequency band.

[0067] Please return Figure 1 In this embodiment, the ground radiator 140 is attached to the bracket 30 and spans the battery pack 20 to connect to the system ground plane 14 and / or the metal base 40. The ground radiator 140 and the system ground plane 14 together form an integral ground plane.

[0068] It is worth mentioning that, in this embodiment, the overall ground plane (ground radiator 140 and system ground plane 14) has a length of 1 / 4 wavelength of the low-frequency full-band (617MHz to 960MHz), approximately 90 mm. This design helps the antenna module 100 to excite the low-frequency full-band (617MHz to 960MHz). In this embodiment, the length L5 of the ground radiator 140 is approximately 70 mm, and the width L6 is approximately 25 mm. Of course, in other embodiments, the relative positions of the components are not limited to this, as long as the ground radiator 140 is connected to the system ground plane 14.

[0069] Figure 5 yes Figure 1 The frequency-VSWR relationship of the antenna module of the electronic device. Please refer to [link / reference]. Figure 5 In this embodiment, the voltage standing wave ratio (VSWR) of the antenna module 100 decreases from low frequency (617MHz).

[0070] ~960MHz), mid-high frequency (1710MHz~2690MHz), 5G Sub-6G high frequency (3300MHz)

[0071] The frequency bands of both the ~5000MHz and LAA high frequencies (5150MHz~5925MHz) can be below 5, possessing wideband antenna characteristics.

[0072] Figure 6 This is a graph showing the relationship between the frequency and antenna efficiency of the antenna module under different lengths L5 of the ground radiator. Figure 6 This shows the relationship between the frequency and antenna efficiency of the antenna module when the length L5 of the ground radiator 140 is 30 mm, 50 mm, and 70 mm.

[0073] Referring to Figure 6 In this embodiment, when the length L5 of the ground radiator 140 is less than 50 mm, the antenna efficiency of low frequency (600-650 MHz) and middle-high frequency (1710-1900 MHz) is significantly affected. Therefore, the length L5 of the ground radiator 140 is greater than 50 mm to have better performance.

[0074] Specifically, when the length L5 of the ground radiator 140 is 50 mm and 70 mm, the antenna efficiency of low frequency 617-960 MHz is -4.1 -6.8 dBi, and the antenna efficiency of high frequency 1710-5925 MHz is -1.8 -5.5 dBi, which has good antenna performance. Therefore, in this embodiment, the length L5 of the ground radiator 140 is greater than 50 mm and less than or equal to 1 / 4 wavelength (about 90 mm) of low frequency.

[0075] It is worth mentioning that, in the electronic device 10 of Figure 1 Although only one antenna module 100 is configured in the electronic device 10, the number of the antenna module 100 can be multiple in other electronic devices, and a MIMO antenna is formed.

[0076] Figure 7 is a top view of multiple antenna modules and a system ground plane according to an embodiment of the present application. Referring to Figure 7 In this embodiment, four antenna modules 100 are vertically arranged above the system ground plane 14, and the projection of the four antenna modules 100 on the system ground plane 14 is located at multiple corners of the system ground plane 14, so that the characteristics of 4x4 MIMO multi-antenna are achieved. In this embodiment, the distance between two adjacent antenna modules 100 is, for example, 140 mm, but is not limited thereto.

[0077] Figure 8 is a top view of multiple antenna modules and a system ground plane according to another embodiment of the present application. Referring to Figure 8 In this embodiment, four antenna modules 100 are horizontally arranged at the periphery of the system ground plane 14 and close to the center of four edges. Since the antenna modules 100 are horizontally arranged, the axis D1 of the ring of the antenna module 100 is perpendicular to a normal D2 of the system ground plane 14. Such an arrangement also achieves the characteristics of 4x4 MIMO multi-antenna. In addition, in this embodiment, the distance between two adjacent antenna modules 100 is, for example, 140 mm, but is not limited thereto.

[0078] In summary, the first part and the second part of the first radiator of the antenna module of the present application extend in different directions from the feeding portion and surround a ring shape, and a first slot is formed between the first part and the second part. The second radiator is arranged beside the first part and is curved corresponding to the shape of the first part. The planar radiator is connected to the second radiator perpendicularly and is arranged beside the first part and the second part, and a gap is formed between the planar radiator and the first part and the second part respectively, and the connecting portion of the first radiator is connected to the planar radiator across the gap. The ground radiator is close to the feeding portion. Such design can make the antenna module resonate at low frequency (especially the full frequency band covering low frequency) and high frequency, and has the effect of wide frequency.

Claims

1. An antenna module, characterized in that, include: A first radiator includes a feed section, a connecting section, a first portion and a second portion extending from the feed section in different directions, the first portion and the second portion forming an annulus, a first slot formed between the first portion and the second portion, and the connecting section protruding from the first portion. A second radiator is disposed next to the first part and is curved in shape corresponding to the first part; A planar radiator is connected to the second radiator and disposed beside the first portion and the second portion. A gap is formed between the planar radiator and both the first and second portions. The connecting portion extends across the gap and connects to the planar radiator. A grounded radiator is installed adjacent to the feeder.

2. The antenna module as described in claim 1, characterized in that, The first part has a notch facing the planar radiator, and the first part is divided into a wide section and a narrow section. The second radiator is located in the notch, and a second slot is formed between the first part, the second radiator and the planar radiator.

3. The antenna module as described in claim 1, characterized in that, A third slot is formed between the grounding radiator and the first radiator.

4. The antenna module as described in claim 1, characterized in that, The antenna module excites a frequency band, and the length of the ground radiator is greater than 50 mm and less than or equal to 1 / 4 wavelength of the frequency band.

5. An electronic device, characterized in that, include: A circuit board, including a system ground plane; as well as At least one antenna module is disposed on top of the circuit board, and each antenna module includes: A first radiator includes a feed section, a connecting section, a first portion and a second portion extending from the feed section in different directions, the first portion and the second portion forming an annulus, a first slot formed between the first portion and the second portion, and the connecting section protruding from the first portion. A second radiator is disposed next to the first part and is curved in shape corresponding to the first part; A planar radiator is connected to the second radiator and disposed beside the first portion and the second portion. A gap is formed between the planar radiator and both the first and second portions. The connecting portion extends across the gap and connects to the planar radiator. A grounded radiator is disposed adjacent to the feeder and connected to the system ground plane.

6. The electronic device as claimed in claim 5, characterized in that, The at least one antenna module includes multiple antenna modules located above the system ground plane, and the projections of these antenna modules onto the system ground plane are located at multiple corners of the system ground plane.

7. The electronic device as claimed in claim 5, characterized in that, The at least one antenna module includes multiple antenna modules located around the system ground plane, with an axis of the ring of each antenna module perpendicular to a normal of the system ground plane.

8. The electronic device as claimed in claim 5, characterized in that, The first part has a notch facing the planar radiator, and the first part is divided into a wide section and a narrow section. The second radiator is located in the notch, and a second slot is formed between the first part, the second radiator and the planar radiator.

9. The electronic device as claimed in claim 5, characterized in that, A third slot is formed between the grounding radiator and the first radiator.

10. The electronic device as claimed in claim 5, characterized in that, It also includes a battery pack disposed between the circuit board and each of the antenna modules, and the ground radiator is connected to the system ground plane across the battery pack.

11. The electronic device as claimed in claim 10, characterized in that, The antenna module excites a frequency band, and the length of the ground radiator is greater than 50 mm and less than or equal to 1 / 4 wavelength of the frequency band.

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