antenna module

Abstract

An antenna module includes a first antenna radiator, a second antenna radiator, a first ground radiator, a second ground radiator, and a capacitive element. The first antenna radiator includes a feed-in end. The second antenna radiator is disposed on one side of the first antenna radiator, and a first slot is formed between a main body portion of the second antenna radiator and the first antenna radiator. The first ground radiator is disposed on the other side of the first antenna radiator, and a second slot is formed between the first ground radiator and the first antenna radiator. The second ground radiator is disposed between the second antenna radiator and the first ground radiator. A third slot is formed between a first branch of the second antenna radiator and the second ground radiator. The capacitive element is disposed on the third slot and connects the second antenna radiator and the second ground radiator.

Description

TECHNICAL FIELD

[0001] The present application relates to an antenna module, and particularly relates to a multi-frequency antenna module. BACKGROUND

[0002] The LTE main antenna and the LTE sub antenna of 5G-Sub 6G need to cover more and more frequency bands. The frequency bands originally covered are 698-960MHz and 1710-2700MHz. The frequency bands newly added are 3300-5000MHz of n77-n79, 5150-5925MHz of LAA B252 and B255, and the low frequency B71 band (617-698MHz). How the antenna module can cover multiple frequency bands is the research scope in the field. SUMMARY

[0003] The present application provides an antenna module capable of covering multiple frequency bands.

[0004] An antenna module of the present application includes a first antenna radiator, a second antenna radiator, a first ground radiator, a second ground radiator, and a capacitive element. The first antenna radiator includes a feed end. The second antenna radiator is disposed on one side of the first antenna radiator and forms a first slot with the first antenna radiator. The second antenna radiator includes a main body portion close to the first antenna radiator and a first branch, and the first slot is formed between the main body portion and the first antenna radiator. The first ground radiator is disposed on the other side of the first antenna radiator and forms a second slot with the first antenna radiator. The second ground radiator is disposed between the second antenna radiator and the first ground radiator. The first branch of the second antenna radiator extends from the main body portion and is close to the second ground radiator, and a third slot is formed between the first branch of the second antenna radiator and the second ground radiator. The capacitive element is disposed on the third slot and connects the second antenna radiator and the second ground radiator.

[0005] In an embodiment of the present application, the first antenna radiator described above includes an L-shaped portion close to the second antenna radiator, and the first slot is formed between the L-shaped portion and the second antenna radiator.

[0006] In an embodiment of the present application, the first antenna radiator described above includes a trapezoidal portion away from the second antenna radiator, an upper base of the trapezoidal portion is close to the first ground radiator, and the feed end is located on the upper base of the trapezoidal portion.

[0007] In an embodiment of the present application, the first slot described above includes a first sub-slot and a second sub-slot, the width of the second sub-slot is greater than the width of the first sub-slot, the first sub-slot connects the second sub-slot and has an included angle less than 180 degrees with the second sub-slot.

[0008] In an embodiment of the present application, the second antenna radiator further comprises a second branch extending from the main portion and proximate to the second sub-slot, the width of the first branch and the width of the second branch are less than the width of the main portion.

[0009] In an embodiment of the present application, the second antenna radiator further comprises a third branch extending from the main portion and distal to the second branch, the width of the third branch is less than the width of the main portion.

[0010] In an embodiment of the present application, the feed-in end is connected to a positive end of a first coaxial transmission line, the first ground radiator is connected to a negative end of the first coaxial transmission line, a turning point of the first branch is connected to a positive end of a second coaxial transmission line, the second ground radiator is connected to a negative end of the second coaxial transmission line.

[0011] In an embodiment of the present application, the first ground radiator and the second ground radiator are complementary in profile toward each other.

[0012] In an embodiment of the present application, the antenna module is disposed on a support, the support comprises a first face, a second face, a third face and a fourth face connected in sequence, a portion of the first ground radiator and a portion of the second ground radiator are disposed on the first face, a portion of the second antenna radiator and another portion of the second ground radiator are disposed on the second face, another portion of the second antenna radiator and a portion of the first antenna radiator are disposed on the third face, another portion of the first antenna radiator and another portion of the first ground radiator are disposed on the fourth face.

[0013] In an embodiment of the present application, the first ground radiator and the second ground radiator are connected to a system ground plane through a conductor.

[0014] Based on the above, the main portion of the second antenna radiator of the antenna module of the present application forms a first slot with the first antenna radiator. The first ground radiator forms a second slot with the first antenna radiator. The second ground radiator forms a third slot with the first branch of the second antenna radiator. The capacitive element is disposed on the third slot and connects the second antenna radiator and the second ground radiator. The above design can make the antenna module of the present application have a multi-frequency effect. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a flattened schematic view of an antenna module according to an embodiment of the present application.

[0016] Figure 2 is Figure 1 a perspective schematic view of the antenna module of

[0017] Figure 3 is a hiddenFigure 2 A schematic diagram of the support structure.

[0018] Figure 4 yes Figure 3 A schematic diagram from other perspectives.

[0019] Figure 5 It is Figure 1 A schematic diagram showing the antenna module mounted on an electronic device.

[0020] Figure 6 yes Figure 5 The frequency-VSWR relationship of the antenna module.

[0021] Figure 7 yes Figure 5 The frequency-isolation relationship of the antenna module.

[0022] Figure 8 yes Figure 5 The relationship between frequency and antenna efficiency of the antenna module.

[0023] The reference numerals in the attached figures are explained as follows:

[0024] A1~A7, B1, B2, D1~D8, G1~G9: Position

[0025] C1: First sub-groove seam

[0026] C2: Second sub-groove

[0027] C3: Second groove

[0028] C4: Third groove

[0029] L1, L6: Length

[0030] L2, L4: Altitude

[0031] L3, L5, L7: Width

[0032] L8: Distance

[0033] O: Capacitor element

[0034] X, Y, Z: Coordinates

[0035] 10: Electronic devices

[0036] 12: First coaxial transmission line

[0037] 14: Second coaxial transmission line

[0038] 20: Bracket

[0039] 21: First Page

[0040] 22: Second page

[0041] 23: third face

[0042] 24: fourth face

[0043] 25: fifth face

[0044] 30, 32: conductor

[0045] 40: host board

[0046] 100, 100': antenna module

[0047] 110: first antenna radiator

[0048] 112: trapezoidal portion

[0049] 114: first portion

[0050] 116: second portion

[0051] 120: second antenna radiator

[0052] 122: main body portion

[0053] 124: first branch

[0054] 126: third branch

[0055] 128: second branch

[0056] 130: ground radiator

[0057] 132: long strip-shaped ground radiator

[0058] 134: trapezoidal ground radiator

[0059] 135: second ground radiator DETAILED DESCRIPTION

[0060] Figure 1 is a flattened view of an antenna module according to an embodiment of the present application. Figure 2 is a perspective view of the antenna module of Figure 1 disposed on a support. Figure 3 is a view of the support of Figure 2 hidden.

[0061] Figure 4 is a view of other perspectives of Figure 3 . Note that Figure 1 is a view of the antenna module 100 of Figure 2 flattened against the surface of the support 20. In Figure 1 , the uppermost and lowermost faces are the same face (the first face 21) of the support 20.

[0062] Referring to Figures 1 to 4 The antenna module 100 of the present embodiment includes a first antenna radiator 110, a second antenna radiator 120, a first ground radiator (including a long strip ground radiator 132 and a trapezoidal ground radiator 134), a second ground radiator 135, and a capacitive element O.

[0063] The second antenna radiator 120 is disposed on one side of the first antenna radiator 110, and a first slot is formed between the second antenna radiator 120 and the first antenna radiator 110. The first slot includes a first sub-slot C1 and a second sub-slot C2. The first sub-slot C1 is connected to the second sub-slot C2 and has an included angle of less than 180 degrees with the second sub-slot C2.

[0064] In the present embodiment, the first antenna radiator 110 includes an L-shaped portion (composed of a first portion 114 and a second portion 116 connected by a bend) close to the second antenna radiator 120 and a trapezoidal portion 112 away from the second antenna radiator 120. A feed-in end (position A1) of the first antenna radiator 110 is located at the upper base of the trapezoidal portion 112. In the present embodiment, the upper base of the trapezoidal portion 112 is widened by positions B1 and B2 on both sides of the position A1, so as to improve the frequency bandwidth of high frequencies.

[0065] The first sub-slot C1 of the first slot is formed between the first portion 114 and the second antenna radiator 120, and the second sub-slot C2 of the first slot is formed between the second portion 116 and the second antenna radiator 120.

[0066] In the present embodiment, the width of the second sub-slot C2 is greater than the width of the first sub-slot C1. The first sub-slot C1 has a smaller width, so as to have a better coupling performance. The width of the first sub-slot C1 is, for example, 0.5 mm to 1 mm, for example, 0.6 mm. The width of the second sub-slot C2 is, for example, 0.5 mm to 1.5 mm, for example, 1 mm, but the width of the first sub-slot C1 and the second sub-slot C2 is not limited thereto.

[0067] In addition, the second antenna radiator 120 includes a main body portion 122 close to the first antenna radiator 110, a first branch 124 extending from the main body portion 122 and close to the second ground radiator 135, a second branch 128 extending from the main body portion 122 and close to the second sub-slot C2, and a third branch 126 extending from the main body portion 122 and away from the second branch 128. The width of the first branch 124, the width of the second branch 128, and the width of the third branch 126 are less than the width of the main body portion 122. Figure 1 It can be seen that the width of the first branch 124, the width of the second branch 128, and the width of the third branch 126 are less than the width of the main body portion 122.

[0068] The first slot (first sub-slot C1 and second sub-slot C2) is located between the main body 122 and the first antenna radiator 110. The first ground radiator (elongated ground radiator 132 and trapezoidal ground radiator 134) is disposed on the other side of the first antenna radiator 110, and forms a second slot C3 between it and the first antenna radiator 110.

[0069] The upper bottom of the trapezoidal portion 112 of the first antenna radiator 110 is close to the first ground radiator (the elongated ground radiator 132 and the trapezoidal ground radiator 134), and the second slot C3 is located between the upper bottom of the trapezoidal portion 112 and the first ground radiator (the elongated ground radiator 132 and the trapezoidal ground radiator 134).

[0070] The second ground radiator 135 is disposed between the second antenna radiator 120 and the first ground radiator (the elongated ground radiator 132 and the trapezoidal ground radiator 134). A third slot C4 is formed between the second ground radiator 135 and the second antenna radiator 120. The third slot C4 is formed between the first branch 124 and the second ground radiator 135. The antenna module 100 adjusts the high-frequency impedance matching bandwidth through the third slot C4.

[0071] Capacitor element O is disposed on the third slot C4 and connects the second antenna radiator 120 and the second ground radiator 135. The capacitor element O (33pF) between the paths at positions D1 and D2 and the paths at positions G6 and G7 of the antenna module 100 can be used to adjust the impedance matching bandwidth of the low-frequency band.

[0072] The feed input (position A1) is connected to a positive end of a first coaxial transmission line 12, and the positive end of the first coaxial transmission line 12 is electrically connected to the motherboard 40. Figure 5 The signal terminal of the module card (not shown). The trapezoidal ground radiator 134 of the first ground radiator is connected to a negative terminal of the first coaxial transmission line 12, and the negative terminal of the first coaxial transmission line 12 is electrically connected to the ground terminal of the module card of the motherboard.

[0073] A bend in the first branch 124 (position D1) is connected to a positive end of a second coaxial transmission line 14. A second ground radiator 135 is connected to a negative end of the second coaxial transmission line 14. The negative end of the second coaxial transmission line 14 is connected to the system ground plane (not shown) via a capacitor element O (capacitance value grounded) and position G6.

[0074] In addition, such as Figure 2 As shown, the antenna module 100 is mounted on the bracket 20 and is a three-dimensional antenna. In this embodiment, the length L1 of the bracket 20 and the antenna module 100 is approximately 81 mm, the widths L3 and L5 are approximately 13.5 mm, and the heights L2 and L4 are approximately 6 mm.

[0075] The antenna module 100 is, for example, attached to the plastic support 20 by being mounted on a flexible circuit board. In other embodiments, the antenna module 100 can also be made by bending a metal piece or by laser direct structuring (LDS).

[0076] The support 20 comprises, in order, a first face 21, a second face 22, a third face 23 and a fourth face 24. The first face 21 is the face that is intended to be attached to the plastic support 20. Figure 1 It can be seen that the trapezoidal ground radiation element 134 of the first ground radiation element and a portion of the second ground radiation element 135 are arranged on the first face 21. The first branch 122, the second branch 128, the partial third branch 126 of the second antenna radiation element 120 and another portion of the second ground radiation element 135 are arranged on the second face 22.

[0077] The main portion 122 of the second antenna radiation element 120 and the second portion 116 of the first antenna radiation element 110 are arranged on the third face 23. The first portion 114, the trapezoidal portion 112 of the first antenna radiation element 110 and the strip-shaped ground radiation element 132 of the first ground radiation element are arranged on the fourth face 24. In the present embodiment, the first sub-slot C1 and the second sub-slot C2 of the first slot are located in the same plane. However, in another embodiment, the first sub-slot C1 can extend towards the first antenna radiation element 110 to increase the width of the first sub-slot C1, so that part of the first sub-slot C1 and the second sub-slot C2 are located in different planes. Such a design can help to achieve a wideband effect.

[0078] In addition, the support 20 further comprises a fifth face 25 connected to the second face 22, and the third branch 126 of the second antenna radiation element 120 extends to the fifth face 25.

[0079] Please refer back to Figure 1 In the present embodiment, the first antenna radiation element 110 is coupled to the L-shaped first slot (the first sub-slot C1 and the second sub-slot C2) formed between the L-shaped path connecting the positions A4, A3, A2, A5, A6, A7 of the first antenna radiation element 110 and the T-shaped path connecting the positions D5, D4, D3, D6, D7, D8 of the second ground radiation element 135 (the path of the positions G6, G7, G8, G9) via the positions D1, D3 by means of the capacitive element O, thereby constituting an open-loop antenna architecture.

[0080] The antenna module 100 can adjust the landing point position of the low frequency 617-800 MHz, the medium-high frequency 2500-2700 MHz, the high frequency 3300-3800 MHz of 5G-Sub 6G resonance frequency band by increasing the length of the path at the end (position D5) of the positions D1, D3, D4, D5. In addition, adjusting the interval of the first slot (the first sub slot C1 and the second sub slot C2) can be used to adjust the impedance matching bandwidth of the low frequency 617-800 MHz, the medium-high frequency 2500-2700 MHz, the high frequency 3300-3800 MHz of 5G-Sub 6G resonance frequency band.

[0081] In addition, the antenna module 100 can adjust the landing point position of the low frequency 800-960 MHz, the medium-high frequency 1900-2300 MHz, the high frequency 3800-5000 MHz of 5G-Sub 6G resonance frequency band by increasing the length of the path at the end (position A7) of the positions A1, A2, A5, A6, A7.

[0082] Further, the antenna module 100 can adjust the landing point position of the medium-high frequency 1710-1900 MHz resonance frequency band by adjusting the length of the path at the end (position A4) of the positions A1, A2, A3, A4, and adjusting the length of the path at the end (position D8) of the positions D1, D3, D6, D7, D8.

[0083] In addition, the path area of the positions A1, A2, A3, B2 can be used to adjust the frequency band of the frequency band LAA B465500-5925MHz. The path area of the positions A1, A2, A3, B1 can be used to adjust the frequency band of the frequency band LAA B465150-5500MHz. Adjusting the interval of the second slot C3 is used to adjust the impedance matching of the frequency band of the frequency band LAA B465150-5500MHz, the frequency band of the frequency band LAA B465500-5925MHz.

[0084] In summary, the antenna module 100 of the present embodiment has the characteristics of supporting multiple frequency bands of 5G-Sub 6G.

[0085] In addition, the second ground radiation body 135 connects the path of the positions G8, G9 in the first face 21 to the path of the positions G6, G7 of the second face 22, and the long strip-shaped ground radiation body 132 of the first ground radiation body in the fourth face 24 connects the path of the positions G5, G4 of the trapezoidal ground radiation body 134 of the first ground radiation body in the first face 21 to the path of the positions G3, G2, G1.

[0086] The trapezoidal ground radiator 134 of the first ground radiator and the trapezoidal ground radiator 135 have complementary outlines facing each other (complementary trapezoids). This design allows the first ground radiator (the strip-shaped ground radiator 132 and the trapezoidal ground radiator 134) and the second ground radiator 135 to be assembled into a large-area ground radiator 130.

[0087] like Figure 2 As shown, the trapezoidal ground radiator 134 and the second ground radiator 135 of the antenna module 100 are connected to the system ground plane through conductors 30 and 32. Conductors 30 and 32 are, for example, copper foil and conductive foam. Conductor 30 (copper foil) is soldered to the paths at positions G3, G2, and G1, and conductor 32 (conductive foam) is attached to the paths at positions G4, G5, G8, and G9, so that the copper foil and conductive foam can form a complete ground with the system ground plane (metal frame), thus achieving better performance.

[0088] The design of the assembled grounding radiator 130, combined with the complete grounding design that connects to the system ground plane via conductors 30 and 32, can effectively reduce the mainboard 40 ( Figure 5 The effect of noise on the first coaxial transmission line 12 and the second coaxial transmission line 14 at a low frequency of 800MHz.

[0089] In addition, in this embodiment, position D1 is used to connect to the CX detection pin of the sensing circuit (not shown) of the motherboard 40, which enables the paths of positions D2, D1, D5, D4, D3, D6, D7, and D8 of the antenna module 100 to be used to detect the approach of an object and reduce the transmission power, thus forming the characteristics of a hybrid multi-band antenna.

[0090] In other words, this design places the sensing circuit on the motherboard 40 instead of the antenna module 100, and then connects the detection signal to the antenna module 100 via a coaxial transmission line, forming a hybrid antenna design. This design can reduce the transmission power when a human body is detected approaching, and at the same time, it can reduce the space occupied by the sensing circuit on the antenna module 100.

[0091] Figure 5 It is Figure 1 A schematic diagram showing the antenna module mounted on the electronic device. Please refer to [link / reference]. Figure 5 In this embodiment, the electronic device 10 is, for example, a tablet computer, with a length L6 of approximately 310 mm and a width L7 of approximately 225 mm. Antenna module 100 is located on the long side of the electronic device 10, and another antenna module 100' is located on the short side of the electronic device 10, serving as the main and secondary antennas for 5G-Sub 6G LTE, respectively. The distance L8 between the two antenna modules 100 and 100' is approximately 190 mm.

[0092] In this embodiment, the totem of the antenna module 100' can be the same as or similar to that of the antenna module 100. For example, the antenna module 100' uses the mirroring method of the main antenna to achieve shared antenna totem, save design costs, and achieve the concept of shared antenna totem design.

[0093] Figure 6 yes Figure 5 The frequency-VSWR relationship of the antenna module. Please refer to [link / reference]. Figure 6 In this embodiment, the voltage standing wave ratio (VSWR) of the two antenna modules 100 and 100' can be less than 6 at low frequencies and less than 3 at high frequencies, thus possessing the characteristics of a multi-band antenna in 5G-Sub 6G.

[0094] Figure 7 yes Figure 5 The frequency-isolation relationship of the antenna module is shown in the diagram. Please refer to [link / reference]. Figure 7 In this embodiment, the distance L8 between the two antenna modules 100 and 100' is... Figure 5 When the diameter is 190 mm, the isolation between the two antenna modules 100 and 100' is less than -15 dB at low frequencies and less than -25 dB at high frequencies, demonstrating good isolation performance.

[0095] Figure 8 yes Figure 5 The frequency-antenna efficiency relationship of the antenna module is shown in the graph. Please refer to [link / reference]. Figure 8 In this embodiment, the antenna efficiency of the two antenna modules 100 and 100' is -3.0 to -8.1 dBi in LTE B17 (617 to 698 MHz), and the antenna efficiency in other frequency bands can be greater than -6 dBi.

[0096] Specifically, in this embodiment, the antenna efficiency of the antenna module 100 (main antenna) is -1.7 to -7.4 dBi for frequencies of 617 to 960 MHz, -2.2 to -4.3 dBi for frequencies of 1710 to 2690 MHz, -2.7 to -4.4 dBi for frequencies of 3300 to 5000 MHz, and -3.1 to -4.3 dBi for frequencies of 5150 to 5925 MHz, exhibiting LTE broadband antenna efficiency performance comparable to 5G-Sub 6G.

[0097] In summary, a first slot is formed between the main body of the second antenna radiator and the first antenna radiator in the antenna module of the present invention. A second slot is formed between the first ground radiator and the first antenna radiator. A third slot is formed between the second ground radiator and the first branch of the second antenna radiator. A capacitor element is disposed on the third slot and connects the second antenna radiator and the second ground radiator. The above design enables the antenna module of the present invention to have a multi-frequency function.

Claims

1. An antenna module, characterized by The antenna module comprises: a first antenna radiator comprising a feed end; a second antenna radiator disposed on one side of the first antenna radiator and forming a first slot with the first antenna radiator, the second antenna radiator comprising a main portion close to the first antenna radiator and a first branch, the first slot being formed between the main portion and the first antenna radiator; a first ground radiator disposed on the other side of the first antenna radiator and forming a second slot with the first antenna radiator; a second ground radiator disposed between the second antenna radiator and the first ground radiator, the first branch of the second antenna radiator extending from the main portion and close to the second ground radiator, the first branch of the second antenna radiator and the second ground radiator forming a third slot therebetween; and a capacitive element disposed on the third slot and connecting the second antenna radiator and the second ground radiator.

2. The antenna module of claim 1, wherein, The first antenna radiator comprises an L-shaped portion close to the second antenna radiator, and the first slot is formed between the L-shaped portion and the second antenna radiator.

3. The antenna module of claim 1, wherein, The first antenna radiator comprises a trapezoidal portion away from the second antenna radiator, an upper base of the trapezoidal portion being close to the first ground radiator, and the feed end being located at the upper base of the trapezoidal portion.

4. The antenna module of claim 1, wherein, The first slot comprises a first sub-slot and a second sub-slot, the width of the second sub-slot being greater than the width of the first sub-slot, the first sub-slot connecting the second sub-slot and having an included angle with the second sub-slot less than 180 degrees.

5. The antenna module of claim 4, wherein, The second antenna radiator further comprises a second branch extending from the main portion and close to the second sub-slot, the width of the first branch and the width of the second branch being less than the width of the main portion.

6. The antenna module of claim 5, wherein, The second antenna radiator further comprises a third branch extending from the main portion and away from the second branch, the width of the third branch being less than the width of the main portion.

7. The antenna module of claim 1, wherein, The feed end is connected to a positive end of a first coaxial transmission line, the first ground radiator is connected to a negative end of the first coaxial transmission line, a turning portion of the first branch is connected to a positive end of a second coaxial transmission line, and the second ground radiator is connected to a negative end of the second coaxial transmission line.

8. The antenna module of claim 1, wherein, The first ground radiator and the second ground radiator are complementary in profile towards each other.

9. The antenna module of claim 1, wherein, The antenna module is disposed on a support, the support comprising a first face, a second face, a third face and a fourth face connected in sequence, a portion of the first ground radiator and a portion of the second ground radiator being disposed on the first face, a portion of the second antenna radiator and another portion of the second ground radiator being disposed on the second face, another portion of the second antenna radiator and a portion of the first antenna radiator being disposed on the third face, another portion of the first antenna radiator and another portion of the first ground radiator being disposed on the fourth face.

10. The antenna module of claim 1, wherein, The first ground radiator and the second ground radiator are connected to a system ground plane through a conductor.

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