Multi-antenna
By setting up the gear and grooves in multi -antenna systems, the problem of insufficient isolation between multi -antennas is solved, and efficient electromagnetic isolation is achieved and the performance of the system is improved.
Patent Information
- Application Number
- CN202380047109.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-06-17
- Filing Date
- 2023-06-16
- Publication Date
- 2025-01-24
AI Technical Summary
In a limited space, the electromagnetic interference and coupling problems between multiple antennas are more prominent, resulting in insufficient isolation.
By setting the ground on the substrate, and forming a groove between the first antennas and the second antennas, the depth and width ratio of the groove are used to increase the isolation between the antenna.
It achieves high isolation between antennas, reduces electromagnetic interference and coupling, and improves system efficiency and capacity.
Smart Images
Figure CN119366060A_ABST
Abstract
Description
Technical Field
[0001] Embodiments relate to multiple antennas. Background Art
[0002] As devices using radio waves diversify, multiple-input multiple-output (MIMO) antennas are used to increase their capacity and efficiency. However, in this case, the number of antennas increases in a limited space, which may cause electromagnetic interference and coupling between antennas. Therefore, various studies are being conducted with the purpose of ensuring isolation between antennas. Summary of the invention
[0003] Technical issues
[0004] The embodiment provides a multi-antenna with high isolation between antennas.
[0005] Technical Solution
[0006] According to an embodiment, the multi-antenna may include: a substrate; a ground portion, which is arranged on one side of the substrate; and a first antenna and a second antenna, which are arranged on the other side of the substrate to be spaced apart from each other in a first direction and opposite to the ground portion in a second direction intersecting the first direction, wherein the first antenna may include a first feeder connected to the ground portion, the second antenna may include a second feeder connected to the ground portion, the second feeder is opposite to the first feeder in the first direction, and the ground portion may include a groove formed between the first feeder and the second feeder and extending along the second direction.
[0007] In an example, a depth of the groove in the second direction may be greater than a width of the groove in the first direction.
[0008] In an example, the width may be 100 μm or more, and the depth may be 200 μm or more.
[0009] In an example, the first feeding line and the second feeding line may have planar shapes that are symmetrical to each other in the first direction with reference to a virtual center line that passes through the center of the groove and extends in the second direction.
[0010] In an example, the first antenna and the second antenna may have planar shapes symmetrical to each other in the first direction with reference to a virtual center line.
[0011] In an example, the substrate may include: a first region overlapping a ground portion in a third direction intersecting each of the first direction and the second direction; and a second region overlapping the first antenna and the second antenna in the third direction, and the groove may be connected to the second region.
[0012] In an example, the first antenna and the second antenna may operate in the same frequency band.
[0013] In an example, a ratio of a depth (d) of the groove in the second direction to a length (L) of the ground portion in the second direction may be as follows:
[0014]
[0015] In an example, each of the first antenna and the second antenna may have a planar inverted-F antenna structure.
[0016] In an example, one of the first antenna and the second antenna may be a Bluetooth antenna, and the remaining one of the first antenna and the second antenna may be a Wi-Fi antenna.
[0017] In an example, each of the first antenna and the second antenna may be a Bluetooth antenna or a Wi-Fi antenna.
[0018] In an example, the first antenna may include a first radiator connected to a first feed line, and the second antenna may include a second radiator connected to a second feed line.
[0019] In an example, the first feed line may include a first feed portion configured to receive current to be supplied to the first radiator, a first ground portion connected to the ground portion and disposed closer to the groove than the first feed portion, and a first line disposed between the first feed portion and the first ground portion, and the second feed line may include a second feed portion configured to receive current to be supplied to the second radiator, a second ground portion connected to the ground portion and disposed closer to the groove than the second feed portion, and a second line disposed between the second feed portion and the second ground portion.
[0020] In an example, the first ground portion and the second ground portion may have planar shapes that are symmetrical to each other in the first direction with reference to a virtual center line that passes through the center of the groove and extends in the second direction.
[0021] In an example, the groove may overlap a space between the first ground portion and the second ground portion in the second direction.
[0022] In an example, the difference between the phase of the current fed to the first feeder and the phase of the current fed to the second feeder may be 180°.
[0023] In an example, the substrate may be exposed through the recess.
[0024] Beneficial Effects
[0025] The multi-antenna according to the embodiment has high isolation between antennas. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 A front perspective view of a multiple antenna according to an embodiment is shown.
[0027] Figure 2 Show Figure 1 A rear perspective view of the multiple antennas shown in FIG.
[0028] Figure 3 Show Figure 1 and Figure 2 A plan view of the multiple antennas shown in FIG.
[0029] Figure 4 Show Figure 3 An enlarged view of portion "A" is shown in FIG.
[0030] Figure 5a shows the voltage standing wave ratio (VSWR) of the multi-antenna according to the comparative example, and Figure 5b The VSWR of multiple antennas according to the embodiment is shown.
[0031] Figure 6a shows the insertion loss of the multi-antenna according to the comparative example, and Figure 6b Insertion loss of multiple antennas according to an embodiment is shown.
[0032] Figure 7a shows the field intensity generated by coupling in the multi-antenna according to the comparative example, and Figure 7b The field strength resulting from coupling in multiple antennas according to an embodiment is shown.
[0033] Figures 8a to 8d It is a diagram for explaining the change of the beam direction according to the phase adjustment in the embodiment. DETAILED DESCRIPTION
[0034] Hereinafter, the present disclosure will be described more fully with reference to the accompanying drawings showing various embodiments. However, the examples may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be more thorough and complete, and will more fully convey the scope of the present disclosure to those skilled in the art.
[0035] It should be understood that when an element is referred to as being "on" or "under" another element, it may be directly on / under the element, or one or more intermediate elements may be present. In addition, when an element is referred to as being "on" or "under", based on the element, "under the element" as well as "above the element" may be included.
[0036] Additionally, relational terms, such as “first,” “second,” “upper,” and “lower,” are used merely to distinguish one object or element from another and do not necessarily require or relate to any physical or logical relationship or order between the objects or elements.
[0037] In the following, a Cartesian coordinate system will be used to describe the multi-antenna 100 according to the embodiment, but the embodiment is not limited thereto. That is, in the Cartesian coordinate system, the x-axis, the y-axis, and the z-axis are orthogonal to each other, but the embodiment is not limited thereto. That is, the x-axis, the y-axis, and the z-axis may intersect each other at an angle, rather than being orthogonal to each other. In the following, for the convenience of description, the x-axis direction will be referred to as the "first direction", the y-axis direction will be referred to as the "second direction", and the z-axis direction will be referred to as the "third direction".
[0038] Figure 1 A front perspective view of a multi-antenna 100 according to an embodiment is shown, and Figure 2 Show Figure 1 A rear perspective view of the multi-antenna 100 is shown in FIG.
[0039] The multi-antenna 100 according to the embodiment may include a substrate (or antenna substrate) 110 , a ground portion 120 , and first and second antennas 130 and 140 .
[0040] The ground portion 120 may be disposed on one side of the substrate 110 .
[0041] The first antenna 130 and the second antenna 140 may be disposed on the other side of the substrate 110 and spaced apart from each other in the first direction, and may be disposed opposite to the ground portion 120 in a second direction intersecting the first direction.
[0042] Figure 3 Show Figure 1 and Figure 2 Here, for the convenience of description, Figure 3 Omitted Figure 1 and Figure 2 Schematic diagram of the first radiator 132 and the second radiator 142 shown in FIG.
[0043] Reference Figure 3 , the substrate 110 may include a first area A1 and a second area A2. The first area A1 may be an area overlapping the ground portion 110 in a third direction intersecting each of the first direction and the second direction, and the second area A2 may be an area overlapping the first antenna 130 and the second antenna 140 in the third direction.
[0044] According to an embodiment, the first antenna 130 and the second antenna 140 may be antennas operating in the same frequency band. In this case, in order to reduce the length of each of the first antenna 130 and the second antenna 140, each of the first antenna 130 and the second antenna 140 may have a planar inverted F antenna (PIFA) structure, but the embodiment is not limited thereto. In the case of the planar inverted F antenna structure, the antenna may be connected to the ground portion 120 and may operate at 1 / 4 wavelength.
[0045] According to an embodiment, each of the first antenna 130 and the second antenna 140 may be a Bluetooth antenna or a Wi-Fi antenna. In this case, the operating frequency of each of the Bluetooth antenna and the Wi-Fi antenna may be 2.45 GHz.
[0046] According to another embodiment, one of the first antenna 130 and the second antenna 140 may be a Bluetooth antenna, and the other thereof may be a Wi-Fi antenna.
[0047] However, the embodiment is not limited to any specific form of each of the first antenna 130 and the second antenna 140. That is, each of the first antenna 130 and the second antenna 140 may be any one of various types of antennas as long as the first antenna 130 and the second antenna 140 can operate at the same frequency. The multi-antenna according to the embodiment may be a multiple-input multiple-output (MIMO) antenna.
[0048] According to an embodiment, the first antenna 130 may include a first feed line 134 , and the second antenna 140 may include a second feed line 144 .
[0049] Each of the first feed line 134 and the second feed line 144 may be connected to the ground portion 120. In this manner, the first antenna 130 and the second antenna 140 may share the ground portion 120.
[0050] The first feed line 134 and the second feed line 144 may be disposed opposite to each other in the first direction.
[0051] In addition, the first antenna 130 may further include a first radiator 132 connected to a first feed line 134 , and the second antenna 140 may further include a second radiator 142 connected to a second feed line 144 .
[0052] The material of each of the first radiator 132 and the second radiator 142 may be metal. In this case, the material of the first portion 132P of the first radiator 132 connected to the substrate 110 may be different from the material of the second portion of the first radiator 132 other than the first portion 132P, but the embodiment is not limited thereto. For example, the entire first radiator 132 may be made of the same metal, and only the first portion 132P may be coated with copper or the like. In addition, the material of the third portion 142P of the second radiator 142 connected to the substrate 110 may be different from the material of the fourth portion of the second radiator 142 other than the third portion 142P. For example, the entire second radiator 142 may be made of the same metal, and only the third portion 142P may be coated with copper or the like.
[0053] In addition, a pattern may be inserted in each of the first radiator 132 and the second radiator 142. The pattern of the first radiator 132 and the pattern of the second radiator 142 may be the same as or different from each other.
[0054] For example, if the first antenna 130 is a Bluetooth antenna and the second antenna 140 is a Wi-Fi antenna, the back pattern of the first radiator 132 may be different from the back pattern of the second radiator 142, such as Figure 2 The reason for inserting the pattern into each of the first radiator 132 and the second radiator 142 is to match the resonance frequency of the first radiator 132 and the second radiator 142 .
[0055] According to an embodiment, the ground portion 120 may include a groove (or a slit) H formed between the first feeding line 134 and the second feeding line 144 to extend in the second direction.
[0056] In the following, reference will be made to the groove H on the ground portion 120. Figure 4 The first antenna 130 and the second antenna 140 are described in detail.
[0057] Figure 4 Show Figure 3 An enlarged view of portion "A" is shown in FIG.
[0058] According to an embodiment, as the difference in the depth (or length) d in the second direction of the groove H is greater than the width w in the first direction of the groove H, the isolation between the first antenna 130 and the second antenna 140 may be increased.
[0059] If the ratio of the depth d to the width w is less than 2, the change in isolation may be slightly small, and if the ratio of the depth d to the width w is greater than 10, the isolation may be saturated. Therefore, the ratio of the depth d to the width w may be set as shown in the following Formula 1.
[0060] [Formula 1]
[0061]
[0062] For example, the width w may be 100 μm or more, and the depth d may be 200 μm or more However, the embodiment is not limited thereto.
[0063] In addition, if the ratio of the depth d in the second direction of the groove H to the length L in the second direction of the ground portion 120 is less than 1 / 30, the change in isolation may be slightly small, and if the ratio of the depth d to the length L is greater than 1 / 3, the isolation may be saturated and the antenna gain may be reduced due to the reduction in the ground portion area. Therefore, the ratio of the depth d to the length L may be set as shown in the following formula 2.
[0064] [Formula 2]
[0065]
[0066] In addition, if Figure 3 As shown, the groove H in the ground portion 120 may be connected to the second area A2. That is, the substrate 110 may be exposed through the groove H. That is, the substrate 110 located in the groove H in the ground portion 120 may be a dielectric layer.
[0067] Reference Figure 4 , the first feeding line 134 may include a first feeding part FP1 , a first ground part GP1 , and a first line L1 .
[0068] The first feed FP1 receives the current supplied to the first radiator 132. The first feed FP1 is electrically separated from the ground 120. The first ground GP1 may be connected to the ground 120 and may be disposed closer to the groove H than the first feed FP1. The first line L1 may be disposed between the first feed FP1 and the first ground GP1. Thus, a path is formed along which the current fed to the first feed FP1 flows to the ground 120 via the first line L1 and the first ground GP1, so that the current can be supplied to the first radiator 132 through the first feed line 134.
[0069] The second feeding line 144 may include a second feeding part FP2 , a second ground part GP2 , and a second line L2 .
[0070] The second feed FP2 receives the current to be supplied to the second radiator 142. The second feed FP2 is electrically separated from the ground 120. The second ground GP2 may be connected to the ground 120 and may be disposed closer to the groove H than the second feed FP2. The second line L2 may be disposed between the second feed FP2 and the second ground GP2. Thus, a path is formed, along which the current fed to the second feed FP2 flows to the ground 120 via the second line L2 and the second ground GP2, so that the current can be supplied to the second radiator 142 through the second feed line 144.
[0071] For example, current may be supplied from an integrated circuit (not shown) to each of the first and second feed parts FP1 and FP2 via an RF line (not shown). The integrated circuit and the RF line may be disposed on the substrate 110 to be electrically insulated from the ground 120 .
[0072] The difference between the phase of the current fed to the first feed line 134 and the phase of the current fed to the second feed line 144 may be 180°.
[0073] The groove H may be formed to overlap the space S between the first and second ground portions GP1 and GP2 in the second direction.
[0074] According to an embodiment, the first and second ground portions GP1 and GP2 may have planar shapes symmetrical to each other in the first direction with reference to a virtual center line CL passing through the center of the groove H and extending in the second direction.
[0075] Alternatively, the first feeding line 134 and the second feeding line 144 may have planar shapes that are symmetrical to each other in the first direction with reference to the virtual center line CL.
[0076] Alternatively, the first antenna 130 and the second antenna 140 may have planar shapes that are symmetrical to each other in the first direction with reference to the virtual center line CL.
[0077] Hereinafter, a multi-antenna according to a comparative example and a multi-antenna according to an embodiment will be described with reference to the accompanying drawings.
[0078] The multi-antenna according to the comparative example is set to have the same configuration as the multi-antenna according to the embodiment, except that the ground portion 120 does not have the groove H.
[0079] In the case of the multi-antenna according to the comparative example, if the resonance frequencies of the first antenna 130 and the second antenna 140 operating in the same frequency band are the same as each other, as the separation distance ( Figure 2As D) decreases, the isolation between the first antenna 130 and the second antenna 140 will decrease, so the interference (ie, coupling) between the antennas may be serious.
[0080] In contrast, in the case of the multi-antenna according to the embodiment, a groove H is formed in the ground portion 120 shared by the first antenna 130 and the second antenna 140 at a position between the first ground portion GP1 and the second ground portion GP2, thereby decoupling the two antennas 130 and 140. That is, the current distribution is changed by the groove H, thereby causing a coupling change. Therefore, the interference between the first antenna 130 and the second antenna 140 can be suppressed. That is, the isolation between the first antenna 130 and the second antenna 140 can be improved.
[0081] The isolation between the first antenna 130 and the second antenna 140 may be affected by the width w and the depth d of the groove H. In particular, in the embodiment, the width w and the depth d of the groove H may be set in consideration of further suppressing the interference between the first antenna 130 and the second antenna 140 as the ratio of the depth d of the groove H to the width w of the groove H increases.
[0082] The multi-antenna according to the comparative example is set so that the antennas 130 and 140 , the feeders 134 and 144 , or the ground portions GP1 and GP2 are asymmetric to each other with respect to the virtual center line CL.
[0083] In contrast, in the case of the multi-antenna according to the embodiment, the antennas 130 and 140, the feed lines 134 and 144, or the ground portions GP1 and GP2 are symmetrical to each other with respect to the virtual center line CL. Therefore, the impedance of the second antenna 140 with respect to the first antenna 130 and the impedance of the first antenna 130 with respect to the second antenna 140 can be equal to each other, so that coupling can be effectively controlled.
[0084] In addition, in the embodiment, even if the antennas 130 and 140, the feed lines 134 and 144, or the ground portions GP1 and GP2 are asymmetric with respect to each other with respect to the virtual center line CL, as described above, due to the presence of the groove H, the isolation between the first antenna 130 and the second antenna 140 can also be greater than the isolation of the comparative example.
[0085] Figure 5a shows the voltage standing wave ratio (VSWR) of the multi-antenna according to the comparative example, and Figure 5b VSWR of multiple antennas according to the embodiment is shown. In each graph, the horizontal axis represents frequency, and the vertical axis represents VSWR. In addition, reference numeral 202 represents the VSWR of the first antenna 130, and reference numeral 204 represents the VSWR of the second antenna 140.
[0086] Figure 6ashows the insertion loss of the multi-antenna according to the comparative example, and Figure 6b Insertion loss of a multi-antenna according to an embodiment is shown. In each graph, the horizontal axis represents frequency, and the vertical axis represents insertion loss.
[0087] Generally, as VSWR decreases, return loss decreases, so resonance is more likely to occur at a particular frequency. As insertion loss decreases, isolation increases.
[0088] Even when the VSWR in the embodiment is smaller than or similar to the VSWR in the comparative example, Figure 5a and Figure 5b As shown, the insertion loss in the embodiment is also smaller than the insertion loss in the comparative example. Figure 6a and Figure 6b As shown, the isolation in the embodiment is greater than that in the comparative example. That is, the multiple antennas in the embodiment improve the isolation between antennas.
[0089] Figure 7a shows the field intensity generated by coupling in the multi-antenna according to the comparative example, and Figure 7b The field strength resulting from coupling in multiple antennas according to an embodiment is shown.
[0090] It can be seen that Figure 7b The field strength ratio generated by coupling in the embodiment shown in FIG. Figure 7a The field strength generated by coupling in the comparative example shown in FIG. 1 is low. When the field strength decreases, the isolation increases. Based on this, it can be seen that the isolation in the embodiment is improved compared to the isolation in the comparative example.
[0091] Figures 8a to 8d It is a diagram for explaining the change of the beam direction according to the phase adjustment in the embodiment.
[0092] In multiple antennas, the beam direction can be changed by the shape of the antenna or by the phase in an array antenna.
[0093] According to an embodiment, in order to improve the gain of the antenna and control the beam direction, the phase of the current fed to the first antenna 130 (hereinafter, referred to as the "first phase") and the phase of the current fed to the second antenna 140 (hereinafter, referred to as the "second phase") can be adjusted to be different from each other.
[0094] When each of the first phase and the second phase is 0°, the beam direction is 0°, such as Figure 8a as shown, and the gain is +2.19dBi.
[0095] In addition, when the first phase is 0° and the second phase is 45°, the beam direction is 35°, such as Figure 8b as shown, and the gain is +2.1dBi.
[0096] In addition, when the first phase is 0° and the second phase is 90°, the beam direction is 62°, as shown in Figure 8c as shown, and the gain is +2.4dBi.
[0097] In addition, when the first phase is 0° and the second phase is 180°, the beam direction is 83°, as shown in Figure 8d as shown, and the gain is +4.8dBi.
[0098] As described above, when the difference between the first phase and the second phase, that is, the phase difference is 180°, the gain has a maximum value.
[0099] As in the embodiment, when the groove H is present on the ground portion 120, the beam direction can be changed and the gain can be maximized by adjusting the phases of the currents fed to the first antenna 130 and the second antenna 140 to be different from each other, compared to when the groove H is not present on the ground portion 120. Therefore, according to the embodiment, the gain can be maximized by adjusting the difference between the first phase and the second phase to 180°.
[0100] When a plurality of antennas using the same frequency band exist in a television, a portable terminal, or the like, the multi-antenna according to the above-described embodiment can be applied.
[0101] Although the present disclosure has been particularly shown and described with reference to its exemplary embodiments, these embodiments are presented for illustrative purposes only and do not limit the present disclosure, and it is obvious to those skilled in the art that various changes in form and details can be made without departing from the basic features of the embodiments set forth herein. For example, the various configurations set forth in the embodiments can be modified and applied. In addition, differences in such modifications and applications should be understood to fall within the scope of the present disclosure as defined by the appended claims. DETAILED DESCRIPTION
[0103] Various embodiments have been described in the best mode of carrying out the present disclosure.
[0104] Industrial Applicability
[0105] The multi-antenna according to the embodiment can be used for various communication devices using radio waves, for example, a television or a portable terminal.
Claims
1. A multi-antenna, comprising: substrate; a ground portion, the ground portion being arranged on one side of the substrate; as well as a first antenna and a second antenna, the first antenna and the second antenna being disposed on the other side of the substrate to be spaced apart from each other in a first direction and facing the ground portion in a second direction intersecting the first direction, Wherein, the first antenna includes a first feeder line connected to the ground portion, The second antenna includes a second feeder connected to the ground portion, the second feeder is opposite to the first feeder in the first direction, and The ground portion includes a groove extending along the second direction between the first feeding line and the second feeding line.
2. The multi-antenna according to claim 1, wherein: The depth of the groove in the second direction is greater than the width of the groove in the first direction.
3. The multi-antenna according to claim 2, wherein: The width is 100 μm or more, and the depth is 200 μm or more.
4. The multi-antenna according to claim 1, wherein: The first feed line and the second feed line have planar shapes that are symmetrical to each other in the first direction with reference to a virtual center line that passes through a center of the groove and extends in the second direction.
5. The multi-antenna according to claim 4, wherein: The first antenna and the second antenna have planar shapes that are symmetrical to each other in the first direction with respect to the virtual center line.
6. The multi-antenna according to claim 1, wherein: The substrate comprises: a first region overlapping the ground portion in a third direction intersecting each of the first direction and the second direction; and a second area, the second area overlapping the first antenna and the second antenna in the third direction, and Wherein, the groove is connected to the second area.
7. The multi-antenna according to claim 1, wherein: The first antenna and the second antenna operate in the same frequency band.
8. The multi-antenna according to claim 1, wherein: The ratio of the depth (d) of the groove in the second direction to the length (L) of the ground portion in the second direction is as follows:
9. The multi-antenna according to claim 1, wherein: Each of the first antenna and the second antenna has a planar inverted-F antenna structure.
10. The multi-antenna according to claim 1, wherein: One of the first antenna and the second antenna is a Bluetooth antenna, and the remaining one of the first antenna and the second antenna is a Wi-Fi antenna.