antenna module

Abstract

An antenna module includes two antenna units, two isolation members, and a ground member. The two antenna units include two feed-in ends, two first radiators, and two second radiators. The two isolation members are disposed between the two antenna units and respectively include two first portions and two second portions. The ground member is disposed beside the two antenna units and the two isolation members. The two second radiators and the two second portions are connected to the ground member. First slots are formed between the first radiators, the second radiators, and the ground member. Second slots are formed between the first radiators and the second radiators. Third slots are formed between the second radiators and the second portions. Fourth slots are formed between the two first portions. The two antenna units and the two isolation members are mirror-symmetrical about the fourth slots, and the two first portions have gradually changing widths in an extension direction of the fourth slots.

Description

Technical Field

[0001] This invention relates to an antenna module, and more particularly to an antenna module having dual antenna elements. Background Technology

[0002] Generally speaking, if two antennas are placed on a small plane without matching circuitry or parasitic totems located on different layers, the isolation between the two antennas is difficult to achieve good performance. Summary of the Invention

[0003] The present invention provides an antenna module having two antenna elements and having good isolation.

[0004] An antenna module of the present invention includes two antenna elements, two isolators, and a grounding member. The two antenna elements include two feed terminals, two first radiators extending from the two feed terminals, and two second radiators extending from the two feed terminals. The two isolators are disposed between the two antenna elements and each includes two adjacent first portions and two second portions of adjacent second radiators. The grounding member is disposed beside the two antenna elements and the two isolators, and the two second radiators and the two second portions are connected to the grounding member. A first slot is formed between each first radiator and its corresponding second radiator and the grounding member; a second slot is formed between each first radiator and its corresponding second radiator; a third slot is formed between each second radiator and its corresponding second portion; and a fourth slot is formed between the two first portions. The two antenna elements and the two isolators are mirror-symmetrical about the fourth slot, and the two first portions have gradually changing widths along an extension direction of the fourth slot.

[0005] In one embodiment of the present invention, the two first parts described above include two right-angled triangular regions, and each second part is connected to a corner of the corresponding right-angled triangular region.

[0006] In one embodiment of the present invention, the two right-angled triangular regions mentioned above include two inclined edges, and the two second parts include two vertical edges connected to the two inclined edges, and the two inclined edges and the two vertical edges together form an M shape.

[0007] In one embodiment of the present invention, each of the first radiators described above includes a first segment, a second segment, and a third segment connected in sequence, the first segment, the second segment, and the third segment surrounding an opening, and a second slot communicating with the opening.

[0008] In one embodiment of the present invention, the aforementioned second slot is formed between the third segment and the second radiator, between the third segment and the second radiator, and between the first segment and the third segment.

[0009] In one embodiment of the present invention, each of the above-mentioned second radiators is connected at the end of the corresponding second part away from the feed end to the end of the corresponding second part away from the first part, and this end of the second radiator and this end of the second part are connected together to the grounding member.

[0010] In one embodiment of the present invention, the width of the first segment next to the opening is greater than the total width of this end of the second radiator and this end of the second portion.

[0011] In one embodiment of the present invention, the total width of this end of the second radiator and this end of the second portion is greater than the width of the second segment.

[0012] In one embodiment of the invention, each of the second segments described above includes an end that is away from the corresponding first segment, and the end of one second segment faces the end of the other second segment.

[0013] In one embodiment of the present invention, each of the above-mentioned second radiators includes a fourth segment, a fifth segment, a sixth segment and a seventh segment connected in sequence, the fourth segment extending from the feed end, the seventh segment connected to the grounding member, and a first slot formed between the fourth segment and the grounding member and between the fifth segment and the seventh segment.

[0014] In one embodiment of the invention, the aforementioned third groove is formed between the seventh segment and the corresponding second portion.

[0015] Based on the above, the two antenna elements of the antenna module of the present invention are arranged in a mirror-like configuration. In each of the two antenna elements, a first slot is formed between the first radiator and the corresponding second radiator and the grounding element. A second slot is formed between the first radiator and the corresponding second radiator. The widths of the first and second slots can be used to adjust the frequency point positions of high and low frequencies and impedance matching. Furthermore, the antenna module of the present invention places two isolators between the two antenna elements to improve the isolation between the two antenna elements. A third slot is formed between each second radiator and its corresponding second portion. A fourth slot is formed between the two first portions of the two isolators. The third and fourth slots can be used to adjust the frequency point positions of the isolation between the two antenna elements. The two first portions of the two isolators have a gradually changing width along the extension direction of the fourth slot, which helps to improve the isolation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an antenna module according to an embodiment of the present invention.

[0017] Figure 2 yes Figure 1 A schematic diagram of an antenna module applied to an electronic device.

[0018] Figure 3 yes Figure 1A schematic diagram of an antenna module applied to another electronic device.

[0019] Figure 4 yes Figure 1 The frequency-VSWR relationship of the antenna module.

[0020] Figure 5 yes Figure 1 The frequency-isolation relationship of the antenna module.

[0021] Figure 6 yes Figure 1 The relationship between frequency and antenna efficiency of the antenna module.

[0022] Figure 7A yes Figure 1 The field pattern of the left antenna element of the antenna module at a frequency of 2450MHz in the XY plane.

[0023] Figure 7B yes Figure 1 The field pattern of the right antenna element of the antenna module at a frequency of 2450MHz in the XY plane.

[0024] Figure 8A yes Figure 1 The field pattern of the left antenna element of the antenna module at a frequency of 5470MHz in the XY plane.

[0025] Figure 8B yes Figure 1 The field pattern of the right antenna element of the antenna module at a frequency of 5470MHz in the XY plane.

[0026] The reference numerals in the attached figures are explained as follows:

[0027] A1~A7, B1~B8, G1~G2: Position

[0028] L1, L3, L4: Length

[0029] L2, L5: Width

[0030] O: Opening

[0031] S1: First groove

[0032] S2: Second groove

[0033] S3: Third groove

[0034] S4: Fourth groove

[0035] W1, W2, W3, W4: Width

[0036] X, Y, Z: Coordinates

[0037] 10: Coaxial transmission line

[0038] 20: Conductor

[0039] 30, 40: Electronic devices

[0040] 100: Antenna Module

[0041] 110, 110': Antenna elements

[0042] 111: First paragraph

[0043] 112: Second paragraph

[0044] 113: Third paragraph

[0045] 114: Fourth paragraph

[0046] 115: Fifth paragraph

[0047] 116: Sixth paragraph

[0048] 117: Seventh paragraph

[0049] 118: First radiator

[0050] 119: Second radiator

[0051] 120, 120': Isolation components

[0052] 122: Part One

[0053] 123: Slanted edge

[0054] 124: Part Two

[0055] 125: Vertical edge

[0056] 130: Grounding component Detailed Implementation

[0057] Figure 1 This is a schematic diagram of an antenna module according to an embodiment of the present invention. Please refer to [link / reference]. Figure 1 The antenna module 100 of this embodiment includes two antenna units 110 and 110', two isolators 120 and 120', and a grounding component 130. The two antenna units 110 and 110' have identical patterns and are symmetrically and mirror-image positioned on the left and right sides. Therefore, the two antenna units 110 and 110' are only arranged in a left-right opposite manner. The two isolators 120 and 120' are disposed between the two antenna units 110 and 110'. The grounding component 130 is disposed beside the two antenna units 110 and 110' and the two isolators 120 and 120', for example... Figure 1 Below.

[0058] The two antenna elements 110 and 110' include two feed terminals (position A1), two first radiators 118 (positions A1 to A7) extending from the two feed terminals (position A1), and two second radiators 119 (positions A1, B1 to B3) extending from the two feed terminals (position A1). Since the patterns of the two antenna elements 110 and 110' are identical, and the patterns of the two isolators 120 and 120' are also identical, the following description will be based on... Figure 1 The left antenna element 110 and the isolator 120 will be described.

[0059] The first radiator 118 includes a first segment 111 (positions A1 to A4), a second segment 112 (positions A4 to A7), and a third segment 113 (positions A5 to A6) connected in sequence by bending. The first segment 111 (positions A1 to A4), the second segment 112 (positions A4 to A7), and the third segment 113 (positions A5 to A6) surround an opening O.

[0060] The second segment 112 (positions A4–A7) includes one end (position A7) that is furthest from the first segment 111 (positions A1–A4). (By...) Figure 1 As can be seen, the end of the second segment 112 of the left antenna element 110 (position A7) faces to the right, and the end of the second segment 112 of the right antenna element 110' (position A7) faces to the left. That is to say, the two ends (position A7) face each other, and this design can achieve better antenna performance.

[0061] The second radiator 119 includes a fourth segment 114 (positions A1-B1), a fifth segment 115 (positions B1-B2), a sixth segment 116 (position B2), and a seventh segment 117 (positions B2-B3) connected in sequence by bending. The fourth segment 114 (positions A1-B1) extends from the feed end (position A1), and the seventh segment 117 (positions B2-B3) is connected to the grounding element 130 (positions G1, G2, G2, G1).

[0062] In this embodiment, a first slot S1 is formed between the first radiator 118, the second radiator 119, and the grounding member 130. Specifically, the first slot S1 is formed between the fourth segment 114 (positions A1-B1) and the grounding member 130, and between the fifth segment 115 (positions B1-B2) and the seventh segment 117 (positions B2-B3). The first slot S1 can be used to adjust the frequency point position and impedance matching of high frequencies (5500-6500MHz).

[0063] A second slot S2 is formed between the first radiator 118 and the second radiator 119, and the second slot S2 communicates with the opening O. Specifically, the second slot S2 is formed between position A7 of the second segment 112 and position B2 of the second radiator 119, between the third segment 113 (positions A5 to A6) and the fifth segment 115 and the fourth segment 114 of the second radiator 119, and between positions A1 to A3 of the first segment 111 and position A6 of the third segment 113.

[0064] The second slot S2 can be used to adjust the frequency position and impedance matching of low frequency (2400~2484MHz) and double frequency (5150~5500MHz), and can also be used to adjust the frequency position and impedance matching of high frequency (6500~7500MHz).

[0065] Additionally, the two isolators 120 and 120' are located between and spaced apart from the two antenna elements 110 and 110'. The two isolators 120 and 120' each include two adjacent first portions 122 (positions B5-B8) and two adjacent second portions 124 (positions B4-B5) of the two second radiators. The two first portions 122 are along... Figure 1 The width gradually changes in the vertical direction. Specifically, in this embodiment, the two first parts 122 (positions B5 to B8) include two right-angled triangular regions (positions B5 to B7), and each second part 124 is connected to one corner (position B5) of the corresponding right-angled triangular region.

[0066] In this embodiment, the two right-angled triangular regions (positions B5 to B7) include two inclined edges 123, and the two second parts 124 include two vertical edges 125 connected to the two inclined edges 123. The two inclined edges 123 and the two vertical edges 125 together form an M-shape. Therefore, the two separators 120 and 120' present an M-shaped open-loop design.

[0067] Furthermore, the two second radiators 119 and the two second portions 124 are connected to the grounding member 130. Specifically, the end of the second radiator 119 away from the feed end (position B3) is connected to the end of the corresponding second portion 124 away from the first portion 122 (position B4), and this end of the second radiator 119 (position B3) and this end of the second portion 124 (position B4) are connected together to the grounding member 130 (positions G1 to G2).

[0068] In this embodiment, the width W1 of the first segment 111 next to the opening O is greater than the total width W3 of the second radiator 119 at position B3 and the second part 124 at position B4. The total width W3 of the second radiator 119 at position B3 and the second part 124 at position B4 is also greater than the width W2 of the second segment 112 (positions A4-A7). This design improves the isolation between the two antenna elements 110 and 110' at low frequencies, and the dimensions of widths W1, W2, and W3 can be fine-tuned to adjust the frequency point of the isolation.

[0069] Furthermore, a third slot S3 is formed between the second radiator 119 and the second portion 124. Specifically, the third slot S3 is formed between the seventh segment 117 (positions B2-B3) of the second radiator 119 and the corresponding second portion 124 (positions B4-B5) of the isolator 120. In addition, a fourth slot S4 is formed between the two first portions 122 of the two isolators 120 and 120'. The third slot S3 and the fourth slot S4 can be used to adjust the isolation of the two antenna elements 110 and 110' at low and high frequencies. Figure 1 As can be seen, the two antenna elements 110 and 110' and the two isolators 120 and 120' are mirror-symmetrical about the fourth slot S4. That is to say, the two antenna elements 110 and 110' and the two isolators 120 and 120' are mirror-symmetrical about both sides of the fourth slot S4.

[0070] In this embodiment, the antenna module 100 can be mounted on a circuit board with a length L1 of approximately 30 mm, a width L2 of approximately 10 mm, and a thickness of approximately 0.4 mm. The length L3 of a single antenna element 110 is approximately 10 mm. The two positive ends of the two coaxial transmission lines 10 are connected to the two feed terminals (position A1), and the two negative ends of the two coaxial transmission lines 10 are connected to the grounding component 130 (position G1). A conductor 20 (e.g., aluminum foil or copper foil) is connected to the grounding component 130 (positions G1, G2, G2, G1), and this conductor 20 is conductive to the system ground plane (not shown).

[0071] The antenna module 100 of this embodiment utilizes a symmetrical dual-feed antenna architecture. Through the M-shaped open loop formed by the first slot S1, the second slot S2, the third slot S3, the fourth slot S4, and the two isolators 120 and 120' extending from the two grounding terminals (position B3), the antenna module 100 can generate dual-band antenna characteristics with excellent isolation and support for the WiFi 6E wideband (5150–7125 MHz). Furthermore, the antenna module 100 is small in size, making it suitable for both large and small electronic devices.

[0072] Figure 2 yes Figure 1 A schematic diagram of an antenna module applied to an electronic device. Please refer to [link / reference]. Figure 2 In this embodiment, Figure 1 The antenna module 100 is applied to an electronic device 30, such as a transformer for the Internet of Things (IoT), but the electronic device 30 can also be an access point (AP) router; the type of electronic device 30 is not limited thereto. The length L4 of the electronic device 30 is approximately 250 mm, and the width L5 is approximately 80 mm. The antenna module 100 can be disposed near the shorter side of the electronic device 30.

[0073] Figure 3 yes Figure 1 A schematic diagram of an antenna module applied to another electronic device. See also... Figure 3 In this embodiment, Figure 1 The antenna module 100 is used in the electronic device 40, which is the upper body of a laptop computer. Two antenna modules 100 can be configured on the upper body of the laptop computer, on the left and right sides above the screen.

[0074] Figure 4 yes Figure 1 The frequency-VSWR relationship of the antenna module. It should be noted that... Figure 4 In the middle, it is depicted Figure 1 The VSWR values ​​of the left antenna unit 110 and the right antenna unit 110' of the antenna module 100 when the width W4 of the fourth slot S4 is not 0 are shown, as well as the VSWR values ​​when the width W4 of the left antenna unit 110 and the right antenna unit 110' of the fourth slot S4 is 0 (that is, the example of the two first parts 122 of the two spacers 120 and 120' being glued together).

[0075] Figure 1 The VSWR values ​​of the left antenna element 110 and the right antenna element 110' of the antenna module 100 (when the width W4 of the fourth slot S4 is not 0, for example, 0.5 mm) are represented by solid lines, while the VSWR values ​​of the left antenna element 110 and the right antenna element 110' when the width W4 of the fourth slot S4 is zero are represented by dashed lines.

[0076] Please see Figure 4 , Figure 4 It can be seen that the VSWR values ​​of the left antenna element 110 and the right antenna element 110' represented by the solid line when the width W4 of the fourth slot S4 is 0.5 mm are better than the VSWR values ​​of the left antenna element 110 and the right antenna element 110' represented by the dashed line when the width W4 of the fourth slot S4 is 0 mm. In particular, the solid line can increase the resonant frequency at low frequencies (2400-2484 MHz).

[0077] Figure 5 yes Figure 1The frequency-isolation relationship of the antenna module. Similarly, in Figure 5 In the middle, the solid line is Figure 1 The isolation performance of the antenna module 100 is shown in the figure. The dashed line represents the isolation performance of the antenna module 100 when the width W4 of the fourth slot S4 is zero. Please refer to [link / reference]. Figure 5 As can be seen from both the solid and dashed lines, the isolation performance can be improved by less than 15dB. However, compared to the dashed line, the solid line shows that at the low-frequency points of 2400MHz and 2484MHz, the isolation can be improved from -10.5dB to -16dB, while at the high-frequency points of 5150MHz and 5500MHz, the isolation can be improved from -13.5dB to -18dB and from -15dB to -19dB, respectively.

[0078] Figure 6 yes Figure 1 The frequency-antenna efficiency relationship of the antenna module is shown in the graph. Please refer to [link / reference]. Figure 6 , Figure 6 The middle part depicts Figure 1 The antenna efficiency of the left antenna element 110 and the right antenna element 110' of the antenna module 100 is as follows: The efficiency of the left antenna element 110 and the right antenna element 110' is -3.8 to -4.1 dBi in WiFi 2.4G low frequency (2400~2484MHz), -3.4 to -4.9 dBi in WiFi 5G high frequency (5150~5850MHz), and -3.1 to -5.2 dBi in WiFi 6E high frequency (5925~7125MHz), exhibiting good antenna performance characteristics.

[0079] Figure 7A yes Figure 1 The field pattern of the left antenna element of the antenna module at a frequency of 2450MHz in the XY plane. Figure 7B yes Figure 1 The field pattern of the right antenna element of the antenna module at a frequency of 2450MHz in the XY plane. Figure 8A yes Figure 1 The field pattern of the left antenna element of the antenna module at a frequency of 5470MHz in the XY plane. Figure 8B yes Figure 1 The field pattern of the right antenna element of the antenna module at a frequency of 5470MHz in the XY plane.

[0080] Please see Figures 7A to 8B In this embodiment, the radiation patterns of the left antenna element 110 and the right antenna element 110 will respectively cover the energy range in the -X axis and X axis directions. The mutual influence between the two antenna radiation patterns is small, so their ECC can be less than 0.1.

[0081] In summary, the antenna module of the present invention has two antenna elements arranged in a mirror configuration. In each antenna element, a first slot is formed between the first radiator, the second radiator, and the grounding element. A second slot is formed between the first radiator and the corresponding second radiator. The widths of the first and second slots can be used to adjust the frequency points and impedance matching of high and low frequencies. Furthermore, the antenna module of the present invention places two isolators between the two antenna elements to improve the isolation between them. A third slot is formed between each second radiator and its corresponding second portion. A fourth slot is formed between the two first portions of the two isolators. The third and fourth slots can be used to adjust the frequency points of the isolation between the two antenna elements. The two first portions of the two isolators have a gradually changing width along the extension direction of the fourth slot, which helps to improve the isolation.

Claims

1. An antenna module, characterized in that, include: The two antenna elements include two feed terminals, two first radiators extending from the two feed terminals, and two second radiators extending from the two feed terminals; Two isolators are disposed between the two antenna elements, and each includes two adjacent first portions and two adjacent second portions of the two second radiators; and A grounding element is disposed next to the two antenna elements and the two isolators. The two second radiators and the two second portions are connected to the grounding element. A first slot is formed between each first radiator and its corresponding second radiator and the grounding element. A second slot is formed between each first radiator and its corresponding second radiator. A third slot is formed between each second radiator and its corresponding second portion. A fourth slot is formed between the two first portions. The two antenna elements and the two isolators are mirror-symmetrical about the fourth slot, and the two first parts have gradually changing widths along an extension direction of the fourth slot. Each of the second radiators includes a fourth segment, a fifth segment, a sixth segment, and a seventh segment connected in sequence. The fourth segment extends from the feed end, the seventh segment is connected to the grounding member, and the first slot is formed between the fourth segment and the grounding member and between the fifth segment and the seventh segment.

2. The antenna module as described in claim 1, characterized in that, The first part comprises two right-angled triangular regions, and each of the second parts is connected to a corner of the corresponding right-angled triangular region.

3. The antenna module as described in claim 2, characterized in that, The two right-angled triangular regions include two sloping edges, and the two second parts include two vertical edges connected to the two sloping edges, which together form an M-shape with the two sloping edges and the two vertical edges.

4. The antenna module as described in claim 1, characterized in that, Each of the first radiators includes a first segment, a second segment, and a third segment connected in sequence, the first segment, the second segment, and the third segment surrounding an opening, and the second slot communicating with the opening.

5. The antenna module as described in claim 4, characterized in that, The second slot is formed between the second segment and the second radiator, between the third segment and the second radiator, and between the first segment and the third segment.

6. The antenna module as described in claim 4, characterized in that, Each of the second radiators is connected at the end away from the feed end to the corresponding end of the second part away from the first part, and the end of the second radiator and the end of the second part are connected together to the grounding member.

7. The antenna module as described in claim 6, characterized in that, The width of the first segment at the location next to the opening is greater than the total width of the end of the second radiator and the end of the second portion.

8. The antenna module as described in claim 6, characterized in that, The total width of the end of the second radiator and the end of the second part is greater than the width of the second segment.

9. The antenna module as described in claim 4, characterized in that, Each of the second segments includes an end that is away from the corresponding first segment, and the end of one of the second segments faces the end of the other second segment.

10. The antenna module as described in claim 1, characterized in that, The third groove is formed between the seventh segment and the corresponding second part.

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