CN106935964B - Multi-antenna device and terminal equipment - Google Patents
Multi-antenna device and terminal equipment Download PDFInfo
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- CN106935964B CN106935964B CN201710119716.7A CN201710119716A CN106935964B CN 106935964 B CN106935964 B CN 106935964B CN 201710119716 A CN201710119716 A CN 201710119716A CN 106935964 B CN106935964 B CN 106935964B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The embodiment of the invention discloses a multi-antenna device which comprises a circuit board, a first antenna, a second antenna and a third antenna, wherein the first antenna and the second antenna are arranged at one side edge of the circuit board, and the main beam directions of the first antenna and the second antenna are different. An isolation groove is arranged between the first antenna and the second antenna and used for isolating mutual interference between the first antenna and the second antenna. The third antenna is disposed at an edge of the other side of the circuit board away from the first and second antennas. The third antenna comprises a radiation main body and a grounding branch, wherein the radiation main body is an IFA antenna, the grounding branch is connected to a grounding pin of the radiation main body, and the grounding branch is used for enabling the main beam direction of the third antenna not to point to the first antenna and the second antenna. The embodiment of the invention also provides the terminal equipment. By adopting the embodiment of the invention, the plurality of antennas are distributed on one circuit board, and the plurality of antennas can be compatible on the premise of ensuring the performance of each antenna.
Description
Technical Field
The present invention relates to the field of antenna technologies, and in particular, to a multi-antenna device and a terminal device having the same.
Background
The wireless terminal equipment needs many compatible modes and devices, and the space left for antenna design is very little, for example, a set top box is used as important terminal equipment, the coverage quality of an antenna is very important for user experience, so that the competitive influence of the antenna design on products is self-evident. In the era, the requirements on the antenna are more and more strict, the size of a single board is smaller and smaller, the number of the antennas is more and more, the cost is lower and more, the lower cost corresponds to a cheaper chip and weaker signal analysis capability, higher requirements are provided for the space between the antennas, and if the isolation cannot meet the requirements of the design specification of a product, signal interference between Wi-Fi (wireless fidelity) and Bluetooth (Bluetooth, BT) antennas can be easily caused, so that the user experience is influenced.
Therefore, how to arrange a plurality of antennas in a limited single-board space enables the plurality of antennas to be compatible on the premise of ensuring the performance of each antenna, which is a direction of continuous research in the industry.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a multi-antenna device and a terminal device having the same, so that a plurality of antennas are laid out on a circuit board, and the plurality of antennas can be compatible with each other on the premise of ensuring the performance of each antenna.
In a first aspect, an embodiment of the present invention provides a multi-antenna apparatus, including a circuit board, a first antenna, a second antenna, and a third antenna, where the first antenna and the second antenna are disposed at a side edge of the circuit board, and main beam directions of the first antenna and the second antenna are different; an isolation groove is arranged between the first antenna and the second antenna and used for isolating mutual interference between the first antenna and the second antenna; the third antenna is arranged at the edge of the other side of the circuit board away from the first antenna and the second antenna; the third Antenna comprises a radiation main body and a grounding branch, wherein the radiation main body is an Inverted-F Antenna (IFA), the grounding branch is connected to a grounding pin of the radiation main body, and the grounding branch is used for enabling the main beam of the third Antenna not to point to the first Antenna and the second Antenna. The ground pin of the radiating body refers to the part connected to the ground plane on the circuit board.
By implementing the embodiment of the invention, a plurality of antennas can be arranged on one circuit board, and the antennas can be compatible with each other on the premise of ensuring the performance of each antenna. Specifically, the main beam directions of the three antennas are different through the layout of the first antenna, the second antenna and the third antenna on the circuit board, the arrangement of the isolation slot between the first antenna and the second antenna and the arrangement of the grounding branch of the third antenna, so that the performance of transmitting and receiving signals of each antenna can be ensured, and the three antennas can be compatible with each other without interference on the same circuit board.
The circuit board may be substantially rectangular, the first antenna and the second antenna are located at a first corner of the circuit board, the third antenna is located at a second corner of the circuit board, and the first corner and the second corner may be adjacent corners or opposite corners. In one embodiment, the first antenna and the second antenna are located at adjacent edges of a corner of the circuit board, and the directions of main beams of the first antenna and the second antenna are different by 90 degrees.
In one embodiment, the first antenna includes a first main body and a first branch, the first main body is IFA and includes a first radiation section, one end of the first radiation section is connected to a feed point of the first antenna, the other end of the first radiation section is a free end, the first branch is bent and extended from the free end, and a gap coupling is formed between the first branch and the first radiation section.
In one embodiment, the first branch includes an extension section and a connection section, the connection section is connected between a free end of the first radiation section and one end of the extension section, and the extension section and the first radiation section are both linear and are disposed opposite to each other. Specifically, the extension section and the connection section may be straight lines perpendicular to each other, and the extension section and the first radiation section may be parallel to each other. The first antenna can generate 2.4G signals through self resonance, and can generate 5G signals through secondary resonance formed between the first branch and the first radiation section. The first antenna is thus a dual-band antenna.
In one embodiment, the second antenna and the first antenna may have the same structure, and both the first antenna and the second antenna may be configured as WIFI antennas. The third antenna may be provided as a BT antenna.
In one embodiment, the ground branch of the third antenna is a quarter-wavelength line, and the path length of the ground branch is set to ensure that the main beam direction of the third antenna is well controlled, so that a reasonable directional pattern avoidance is realized among the three antennas.
Specifically, the grounding branch comprises a first section, a second section and a third section which are sequentially connected, the first section and the third section are oppositely arranged, one end, far away from the second section, of the first section is connected to the grounding pin of the radiation main body, and one end, far away from the second section, of the third section is a free end. The free end points towards the ground pin of the radiating body.
In one embodiment, the third antenna further comprises an open branch connected to the free end of the radiating body, the open branch being used to control the beam direction of the third antenna. In this embodiment, the open-circuit branch is located on the right side of the radiation main body, and the open-circuit branch enables the main beam direction of the third antenna to face to the right, that is, the open-circuit branch is located on which side of the radiation main body, so that the main beam direction of the third antenna faces to which direction.
Specifically, the open circuit branch is L-shaped and includes a first section and a second section, the first section being vertically connected between the second section and the radiating body.
In one embodiment, a first ground branch and a second ground branch are formed on two sides of the isolation slot, the first ground branch is used for reflecting the electromagnetic signal generated by the first antenna and directed to the second antenna, and the second ground branch is used for reflecting the electromagnetic signal generated by the second antenna and directed to the first antenna. The isolation groove is a slot formed by etching on the ground layer of the circuit board, and the first ground branch and the second ground branch are formed simultaneously after etching. The isolation trench is a quarter wavelength.
In one embodiment, the antenna apparatus further includes a first coupling branch, where the first coupling branch is located on a side of the first antenna facing the third antenna, and the first coupling branch is configured to reflect an electromagnetic signal generated by the first antenna and directed to the third antenna.
Specifically, the first coupling branch includes a bent section and a free section, the bent section is connected between the free section and a ground layer of the circuit board, and the free section is directed to the first antenna. The bending section comprises a first section, a second section and a third section which are sequentially connected, the first section and the third section are arranged opposite to each other, one end of the free section is connected to one end, far away from the second section, of the third section, and the free end of the free section points to the first antenna.
In one embodiment, the antenna apparatus further includes a second coupling branch, located on a side of the second antenna away from the first antenna, for reflecting an electromagnetic signal generated by the second antenna and directed to the electronic far away inside the circuit board. The structure of the second coupling branch may be the same as that of the first coupling branch. The second coupling branch comprises a bent section and a free section, the free section of the second coupling branch points to a radiator of the second antenna, the bent section of the second branch is located between the free section and a ground layer of the circuit board, the second coupling branch can weaken the influence of electromagnetic signals generated by the second antenna on other electronic elements on the circuit board, and one side of the second coupling branch, which is far away from the second antenna, can be provided with other electronic elements, such as an input/output interface and the like.
In a second aspect, an embodiment of the present invention provides a terminal device, including the antenna apparatus according to any one of the foregoing embodiments. The antenna device is applied to terminal equipment, and development requirements for miniaturization of terminal setting size are facilitated.
In summary, in the embodiments of the present invention, the first antenna, the second antenna, and the third antenna are disposed at the edge of the circuit board, and the third antenna is disposed away from the first antenna and the second antenna, the main beam direction of the third antenna is controlled by the ground branch of the third antenna, and the isolation between the first antenna and the second antenna is controlled by the isolation slot between the first antenna and the second antenna, so that the three antennas can be compatible on the same circuit board, and the main beam directions of the three antennas are not directed to each other in a working state, so that the performances of the three antennas are ensured and do not interfere with each other.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present invention, the drawings required to be used in the embodiments or the background art of the present invention will be described below.
Fig. 1 is a schematic diagram of a multi-antenna apparatus according to an embodiment of the present invention;
fig. 2 is an enlarged schematic view of a portion I (i.e., a first antenna) of the multi-antenna apparatus shown in fig. 1;
FIG. 3 is an enlarged schematic view of section II (i.e., the second antenna) of the multiple antenna apparatus shown in FIG. 1;
fig. 4 is an enlarged schematic view of part III (i.e., a third antenna) in the multi-antenna apparatus shown in fig. 1;
fig. 5 is a schematic diagram illustrating distances between antennas in the antenna apparatus according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating return loss curves of antennas in an antenna apparatus according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating an insertion loss between antennas in an antenna apparatus according to an embodiment of the present invention;
fig. 8 is a beam pattern of a first antenna and a second antenna in an antenna apparatus according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described below with reference to the drawings.
The embodiment of the invention provides a multi-antenna device which is applied to terminal equipment, wherein the terminal equipment can be a set top box, a router, a tablet personal computer, a mobile phone and the like. The terminal device generally includes a plurality of different functions, such as a Wi-Fi function, a Bluetooth (BT) function, and the like, and a plurality of antennas are disposed in the terminal device and respectively perform signal transmission corresponding to different function modules, such as a Wi-Fi antenna, a BT antenna, and the like. The layout of the antennas in the multi-antenna device provided by the embodiment of the invention in the terminal equipment can realize good inter-line isolation, so that signals among the antennas do not interfere with each other, and the signal transceiving performance of each antenna is ensured.
Referring to fig. 1, the multi-antenna apparatus includes a circuit board 100, a first antenna 10, a second antenna 20, and a third antenna 30. The circuit board 100 may be a main board in a terminal device, the circuit board 100 is provided with a ground layer 101, and an edge position of the circuit board 100 is provided with an antenna arrangement area 102, in this embodiment, as shown in fig. 1, one corner of the circuit board 100 is provided with one antenna arrangement area 102, the other corner is provided with one antenna arrangement area 102, and a large-area ground layer is provided between the antenna arrangement areas 102 at the two corner positions, so that the two areas are isolated from each other. Specifically, the ground layer 101 on the circuit board 100 is originally distributed over the whole circuit board, and the antenna distribution area 102 is formed at two corner positions by etching. The embodiment of fig. 1 places the antenna placement area 102 at the corner of the circuit board 100 to facilitate placement of electronic components in other areas of the circuit board 100. Of course, the antenna disposition area 102 may be disposed at other positions (non-corner positions) on the edge of the circuit board 100.
In this embodiment, the first antenna 10 and the second antenna 20 are disposed at one side edge of the circuit board 100, and the main beam directions of the first antenna 10 and the second antenna 20 are different. An isolation slot 40 is disposed between the first antenna 10 and the second antenna 20 for isolating mutual interference between the first antenna 10 and the second antenna 20. In one embodiment, the first antenna 10 and the second antenna 20 are located at adjacent edges of the circuit board 100 at one corner, and the main beams of the two antennas are different from each other by 90 degrees.
The third antenna 30 is disposed at the edge of the other side of the circuit board 100 away from the first antenna 10 and the second antenna 20. The circuit board 100 may be substantially rectangular, the first antenna 10 and the second antenna 20 are located at a first corner of the circuit board 100, the third antenna 30 is located at a second corner of the circuit board 100, and the first corner and the second corner may be adjacent corners or opposite corners. In the embodiment shown in fig. 1, the first corner and the second corner are disposed adjacent to each other, so that all the antennas are disposed in a concentrated manner in the left area of the circuit board 100, and the right area of the circuit board 100 and the area between the first corner and the second corner together form a large-area antenna forbidden region for disposing other electronic devices.
The third antenna 30 comprises a radiation main body 32 and a grounding branch 34, the radiation main body 32 is an IFA, the grounding branch 34 is connected to a grounding pin 322 of the radiation main body 32, and the grounding branch 34 is used for making the main beam of the third antenna 30 not point to the first antenna 10 and the second antenna 20. The ground pin 322 of the radiating body 32 refers to the part connected to the ground plane 101 on the circuit board 100.
By implementing the embodiment of the invention, a plurality of antennas can be arranged on one circuit board 100, and the antennas can be compatible with each other on the premise of ensuring the performance of each antenna. Specifically, the layout of the first antenna 10, the second antenna 20 and the third antenna 30 on the circuit board 100, the arrangement of the isolation slot 40 between the first antenna 10 and the second antenna 20, and the arrangement of the grounding branch 34 of the third antenna 30 make the main beam directions of the three antennas different, so that on the same circuit board 100, not only the performance of transmitting and receiving signals of each antenna can be ensured, but also the three antennas can be compatible with each other without interference.
The IFA, also known as an inverted F antenna, is shaped as an inverted "F" and includes a ground point and a feed point. Generally, the IFA radiating portion is a flat plate or a straight line, and the IFA further includes a ground pin connected between the ground point and the radiating portion, and a feeding portion connected between the feeding point and the radiating portion. The feed point and the ground pin may be parallel to each other and both may be perpendicular to the radiating portion.
The first antenna 10 has the following specific structure:
in one embodiment, the first antenna 10 includes a first body 12 and a first branch 14, the first body 12 is an IFA, the first body 12 includes a first radiation section 126, one end of the first radiation section 126 is connected to a feeding point of the first antenna 10, the other end of the first radiation section 126 is a free end, the first branch 14 is bent and extended from the free end, and a gap coupling is formed between the first branch 14 and the first radiation section 126.
Specifically, the first body 12 includes a first ground pin 122, a first feed section 124, a first radiation section 126 and a second radiation section 128, one end of the first ground pin 122 is connected to the ground of the circuit board 100, the other end of the first ground pin 122 is connected to one end of the second radiation section 128, one end of the first feed section 124 is connected to the other end of the second radiation section 128, the other end of the first feed section 124 is a feed point of the first antenna 10, and one end of the first radiation section 126 is connected to both the first feed section 124 and the second radiation section 128 and is collinear with the second radiation section 128. The first feed segment 124 is parallel to the first ground pin 122.
In one embodiment, the first branch 14 includes an extension section 142 and a connection section 144, the connection section 144 is connected between a free end of the first radiation section 126 and one end of the extension section 142, and the extension section 142 and the first radiation section 126 are both arranged linearly and oppositely. Specifically, the extension segment 142 and the connection segment 144 may be straight lines perpendicular to each other, and the extension segment 142 and the first radiation segment 126 may be parallel to each other. Specifically, the length of extension segment 142 is greater than the sum of the lengths of first radiating segment 126 and second radiating segment 128.
The first antenna 10 can generate a 2.4G signal by its own resonance, and can generate a 5G signal by a secondary resonance formed between the first branch 14 and the first radiation section 126. The first antenna 10 is thus a dual-band antenna.
In one embodiment, the structure of the second antenna 20 and the first antenna 10 may be the same, and the structure of the second antenna 20 is as follows.
The second antenna 20 includes a second body 22 and a second branch 24, the second body 22 is an IFA, the second body 22 includes a fourth radiation section 226, one end of the fourth radiation section 226 is connected to a feeding point of the second antenna 20, the other end of the fourth radiation section 226 is a free end, the second branch 24 is bent and extended from the free end, and a slot coupling is formed between the second branch 24 and the fourth radiation section 226.
Specifically, the second body 22 includes a second ground pin 222, a second feed segment 224, a third radiation segment 228, and a fourth radiation segment 226, one end of the second ground pin 222 is connected to the ground of the circuit board 100, the other end of the second ground pin 222 is connected to one end of the third radiation segment 228, one end of the second feed segment 224 is connected to the other end of the third radiation segment 228, the other end of the second feed segment 224 is a feeding point of the second antenna 20, and one end of the fourth radiation segment 226 is connected to both the second feed segment 224 and the third radiation segment 228 and is collinear with the third radiation segment 228. The second feed segment 224 is parallel to the second ground leg 222.
In one embodiment, the second branch 24 includes an extension 242 and a connection 244, the connection 244 is connected between a free end of the fourth radiation section 226 and an end of the extension 242, and the extension 242 and the fourth radiation section 226 are both linear and opposite to each other. Specifically, the extension segment 242 and the connection segment 244 may be straight lines disposed perpendicular to each other, and the extension segment 242 and the fourth radiation segment 226 may be parallel to each other. Specifically, the length of the extension segment 242 is greater than the sum of the lengths of the third and fourth radiation segments 228 and 226.
In one embodiment, the extension of the first branch 14 of the first antenna 10 extends 90 degrees away from the extension of the second branch 24. That is, the arrangement of the first antenna 10 and the arrangement of the second direction are different by 90 degrees, so that the main beam direction of the first antenna 10 and the main beam direction of the second direction are different by 90 degrees, in the embodiment shown in fig. 1, the main beam direction of the first antenna 10 faces to the left, and the main beam direction of the second antenna 20 faces to the bottom.
The third antenna 30 is structured as follows.
Referring to fig. 4, the radiating body 32 of the third antenna 30 includes a ground pin 322, a feeding section 323, and a radiating portion 326, one end of the radiating portion 326 is connected to the ground pin 322, and the other end of the radiating portion 326 is a free end of the radiating body 32. The ground branch 34 is located on the side of the ground leg 322 of the radiating body 32.
In one embodiment, the grounding branch 34 of the third antenna 30 is a quarter-wavelength line, and the setting of the path length of the grounding branch 34 can ensure that the main beam direction of the third antenna 30 is well controlled, and a more reasonable directional pattern avoidance is realized among the three antennas.
Specifically, the grounding branch 34 includes a first section 324, a second section 344, and a third section 346 sequentially connected, the first section 342 is disposed opposite to the third section 326, an end of the first section 342 away from the second section 344 is connected to the grounding pin 322 of the radiating body 32, and an end of the third section 346 away from the second section 344 is a free end. The free end of the third segment 346 points towards the ground leg 322 of the radiating body 32.
In one embodiment, the ground leg 34 is connected to the intersection of the ground leg 322 and the radiating portion 326. The first section 342 of the ground leg 34 and the radiating portion 326 may be disposed co-linearly. In other embodiments, the grounding branch 34 may be connected to other positions of the grounding pin 322.
In one embodiment, the third antenna 30 further includes an open branch 36, and the open branch 36 is connected to the free end of the radiating body 32, that is, the open branch 36 is connected to an end of the radiating segment 326 away from the ground pin 322. The open branch 36 is used to control the beam direction of the third antenna 30. In the present embodiment, the open branch 36 is located at the right side of the radiation main body 32, and the open branch 36 enables the main beam direction of the third antenna 30 to face to the right, that is, the open branch 36 is located at which side of the radiation main body 32, which enables the main beam direction of the third antenna 30 to face to which direction.
In particular, the open branch is L-shaped and comprises a first section 362 and a second section 364, said first section 362 being vertically connected between said second section 364 and said radiating body 32.
In one embodiment, a first ground branch 34 and a second ground branch 34 are further disposed between the first antenna 10 and the second antenna 20. The isolation slot 40 is a slot formed by etching on the ground layer of the circuit board 100, and after etching, a first ground branch for reflecting the electromagnetic signal generated by the first antenna 10 and directed to the second antenna 20 and a second ground branch for reflecting the electromagnetic signal generated by the second antenna 20 and directed to the first antenna 10 are formed at the same time. Specifically, the isolation trench 40 is a quarter wavelength.
Referring to fig. 2, in one embodiment, the antenna apparatus further includes a first coupling branch 60, the first coupling branch 60 is located on a side of the first antenna 10 facing the third antenna 30, and the first coupling branch 60 is used for reflecting an electromagnetic signal generated by the first antenna 10 and directed to the third antenna 30.
Specifically, the first coupling branch 60 includes a bent section 62 and a free section 64, and in one embodiment, the bent section 62 is η -shaped. The bent section 62 is connected between the free section 64 and the ground layer 101 of the circuit board 100, and the free section 64 is directed to the first antenna 10. The bending section 62 comprises a first section 621, a second section 622 and a third section 623 which are connected in sequence, the first section 621 and the third section 623 are arranged opposite to each other, one end of the free section 64 is connected to one end of the third section 623 far away from the second section 622, and the free end of the free section 64 points to the first antenna 10. Specifically, the first segment 621 is parallel to the third segment 623, and the second segment 622 is vertically connected between the first segment 621 and the third segment 623.
Referring to fig. 3, in an embodiment, the antenna apparatus further includes a second coupling branch 70, where the second coupling branch 70 is located on a side of the second antenna 20 away from the first antenna 10, and is used for reflecting an electromagnetic signal generated by the second antenna 20 and directed to an interior of the circuit board 100. The structure of the second coupling branch 70 may be the same as that of the first coupling branch 60. The second coupling branch 70 includes a bent section 72 and a free section 74, the free section 74 of the second coupling branch 70 points to the radiator of the second antenna 20, the bent section 72 of the second coupling branch 70 is located between the free section 74 and the ground layer of the circuit board 100, the second coupling branch 70 is configured to weaken the influence of the electromagnetic signal generated by the second antenna 20 on other electronic components on the circuit board 100, and the side of the second coupling branch 70 away from the second antenna 20 may be provided with other electronic components, such as an input/output interface, and the like. In one embodiment, the bent segment 72 of the second coupling branch 70 has the same structure as the bent segment 62 of the first coupling branch 60.
Both the first antenna 10 and the second antenna 20 may be configured as WIFI antennas. The third antenna 30 may be provided as a BT antenna.
Referring to fig. 5, a distance D1 between the first antenna 10 and the second antenna 20 is about 30mm or less, a distance D2 between the first antenna 10 and the third antenna 30 is about 60mm or more, and the distance between the antennas refers to a straight distance between feeding points of the antennas. The distance D2 between the second antenna 20 and the third antenna 30 is greater than the distance D1 between the first antenna 10 and the third antenna 30.
Referring to fig. 6, a return loss diagram of the first antenna 10, the second antenna 20 and the third antenna is shown. Wherein S (1,1) represents the return loss curve of the first antenna 10; s (2,2) represents the return loss curve of the second antenna 20; s (3,3) represents the return loss curve of the third antenna 30. As can be seen from fig. 6: the return loss of each antenna substantially meets the conventional-10 dB requirement, and the industry often uses-10 dB as the standard of the return loss of the antenna.
Fig. 7 shows an insertion loss between antennas. 1 represents the first antenna 10, 2 represents the second antenna 20, and 3 represents the third antenna 30. dB (S (2,1)) represents the insertion loss between the second antenna and the first antenna. dB (S (3,1)) represents the insertion between the third antenna and the first antenna, and dB (S (3,2)) represents the insertion loss between the third antenna and the second antenna. The insertion loss is isolation, the numerical value of the isolation directly expresses the degree of mutual influence among the antennas, the smaller the isolation [ the larger the absolute value ], the smaller the influence among the antennas is, and the acceptance of the chip in the industry is probably that the Wi-Fi interval isolation standard is-15 dB; the Wi-Fi is separated from BT by-25 dB. Fig. 7 is a graph of insertion loss, showing that the embodiment of the present invention can satisfy the resolution capability of most chips.
Referring to fig. 8, beam patterns of the first antenna and the second antenna are shown, and both the first antenna and the second antenna are WIFI antennas, and it can be seen from the figure that coverage on horizontal planes of the two WIFI antennas (i.e. planes where the circuit boards are located) is not greatly affected, and a uniform coverage effect can be basically achieved. The first antenna and the second antenna in the multi-antenna device provided by the embodiment of the application include two frequency bands of 2400-.
The multi-antenna device provided by the embodiment of the invention is applied to terminal equipment, and is beneficial to the development requirement of miniaturization of the terminal setting size.
In summary, by implementing the embodiments of the present invention, the first antenna 10, the second antenna 20, and the third antenna 30 are disposed at the edge of the circuit board 100, and the third antenna 30 is disposed away from the first antenna 10 and the second antenna 20, the main beam direction of the third antenna 30 is controlled by the ground branch 34 of the third antenna 30, and the isolation between the first antenna 10 and the second antenna 20 is controlled by the isolation slot 40 between the first antenna 10 and the second antenna 20, so that the three antennas can be compatible on the same circuit board 100, and in the operating state, the main beam directions of the three antennas are not directed, so that the performances of the three antennas are ensured and do not interfere with each other. High isolation is realized by controlling an antenna directional diagram, the analysis capability of a chip (WIFI chip) is met, the use of a low-cost chip is ensured, and the user experience is not influenced. The multi-antenna device provided by the embodiment of the invention not only can meet the requirement of isolation, but also can realize more uniform coverage of wireless signals on a horizontal plane, and ensure the quality of throughput of all angles.
Claims (11)
1. A multi-antenna device is characterized by comprising a circuit board, a first antenna, a second antenna and a third antenna,
the first antenna and the second antenna are arranged at one side edge of the circuit board, and the main beam directions of the first antenna and the second antenna are different;
an isolation groove is arranged between the first antenna and the second antenna and used for isolating mutual interference between the first antenna and the second antenna;
the third antenna is arranged at the edge of the other side of the circuit board away from the first antenna and the second antenna;
the third Antenna comprises a radiation main body and a grounding branch, wherein the radiation main body is an Inverted-F Antenna (IFA), the grounding branch is connected to a grounding pin of the radiation main body, and the grounding branch is used for enabling a main beam of the third Antenna not to point to the first Antenna and the second Antenna; the grounding branch circuit comprises a first section, a second section and a third section which are sequentially connected, the first section and the third section are oppositely arranged, one end, far away from the second section, of the first section is connected to the grounding pin of the radiation main body, one end, far away from the second section, of the third section is a free end, and the third section extends towards the grounding pin.
2. The multiple antenna device of claim 1, wherein the first antenna includes a first body and a first branch, the first body is an IFA and includes a first radiating section, one end of the first radiating section is connected to a feeding point of the first antenna, the other end of the first radiating section is a free end, the first branch extends from the free end in a bent manner, and a slot coupling is formed between the first branch and the first radiating section.
3. The multiple antenna device according to claim 2, wherein the first branch includes an extension section and a connection section, the connection section is connected between a free end of the first radiation section and one end of the extension section, and the extension section and the first radiation section are both linear and are disposed opposite to each other.
4. The multiple antenna device of claim 1, wherein the ground branch is a quarter-wave line.
5. The multiple antenna device of claim 1, wherein the third antenna further comprises an open branch connected to the free end of the radiating body, the open branch for controlling a beam direction of the third antenna.
6. The multiple antenna device of claim 5, wherein the open branch is L-shaped and includes a first segment and a second segment, the first segment being connected vertically between the second segment and the radiating body.
7. The antenna device according to claim 1, wherein a first ground branch for reflecting the electromagnetic signal generated by the first antenna and directed to the second antenna and a second ground branch for reflecting the electromagnetic signal generated by the second antenna and directed to the first antenna are formed on both sides of the isolation groove.
8. The antenna device of claim 7, wherein the isolation slot is a quarter wavelength.
9. The antenna device of claim 1, further comprising a first coupling branch located on a side of the first antenna facing the third antenna, the first coupling branch being configured to reflect an electromagnetic signal generated by the first antenna and directed toward the third antenna.
10. The antenna arrangement according to claim 9, wherein the first coupling branch comprises a bent section and a free section, the bent section being connected between the free section and a ground layer of the circuit board, the free section being directed towards the first antenna.
11. A terminal device, characterized in that it comprises an antenna arrangement according to any of claims 1-10.
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| CN107369881A (en) * | 2017-08-11 | 2017-11-21 | 常熟市泓博通讯技术股份有限公司 | Composite metal plate TV set aerial |
| CN107919526B (en) * | 2017-10-13 | 2020-09-18 | 瑞声科技（南京）有限公司 | Antenna system and mobile terminal |
| CN108306097A (en) * | 2017-12-25 | 2018-07-20 | 北京联合众为科技发展有限公司 | A kind of handheld communication devices and antenna element method |
| US11276925B2 (en) | 2018-01-31 | 2022-03-15 | Dell Products, Lp | System and method for establishing and operating plural antenna systems in proximity |
| WO2019198862A1 (en) * | 2018-04-09 | 2019-10-17 | 엘지전자 주식회사 | Mobile terminal |
| CN108565544B (en) * | 2018-04-20 | 2023-10-17 | 深圳市信维通信股份有限公司 | Ultra-wideband 5G MIMO antenna structure |
| TWI695544B (en) * | 2018-11-02 | 2020-06-01 | 和碩聯合科技股份有限公司 | Electronic device |
| US11460891B2 (en) | 2019-04-25 | 2022-10-04 | Compal Electronics, Inc. | Electronic device |
| CN110165383A (en) * | 2019-06-24 | 2019-08-23 | 深圳市三极技术有限公司 | Multi-standard module antenna system and mobile terminal |
| CN110854523B (en) * | 2019-11-28 | 2021-12-31 | 歌尔科技有限公司 | Electronic equipment and antenna system thereof |
| CN117008111A (en) * | 2023-10-07 | 2023-11-07 | 成都瑞达物联科技有限公司 | Barrier radar device and target detection method |
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