CN108711668B - Antenna device and electronic apparatus - Google Patents
Antenna device and electronic apparatus Download PDFInfo
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- CN108711668B CN108711668B CN201810381487.0A CN201810381487A CN108711668B CN 108711668 B CN108711668 B CN 108711668B CN 201810381487 A CN201810381487 A CN 201810381487A CN 108711668 B CN108711668 B CN 108711668B
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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
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
- H01Q1/2266—Supports; Mounting means by structural association with other equipment or articles used with computer equipment disposed inside the computer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Support Of Aerials (AREA)
- Waveguide Aerials (AREA)
- Details Of Aerials (AREA)
Abstract
The invention relates to an antenna device and an electronic apparatus. The antenna device includes: a first earth formation; a second subterranean formation located below the first subterranean formation, wherein the second subterranean formation contains a motherboard, and the first subterranean formation is connected to the second subterranean formation; and an antenna element located adjacent to the first ground layer and forming a coupling with the first ground layer through the coupling slot. The invention provides a novel antenna device. One use of the invention is a bluetooth antenna.
Description
Technical Field
The present invention relates to the field of antenna technologies, and in particular, to an antenna device and an electronic device.
Background
In the prior art, the antenna element needs to be isolated from the circuit board to avoid the influence of the circuit board on the antenna device. For example, a large clearance area needs to be provided on the circuit board to accommodate the antenna element. Typically, the antenna element is spaced a distance from the circuit board above the clearance area of the circuit board. Therefore, the antenna device usually occupies a large space in the electronic device.
In recent years, wearable devices using wireless transmission have received much attention. Wearable devices include, for example, headsets, watches. Nowadays, people often wear intelligent bluetooth headsets and/or smart watches while running. In addition, intelligent wireless devices, such as smart home devices, have also greatly enriched people's daily lives. The smart home devices include, for example, a sweeping robot, a smart sound box, and the like. People can enjoy comfort and convenience of life through the intelligent household equipment.
For example, various bluetooth headsets have emerged. Bluetooth headsets are enjoyed by people for their convenience. The appearance of the Bluetooth headset is rich and diverse. The design of the bluetooth antenna is also changed accordingly so as to be adapted to the appearance of the bluetooth headset. Generally, a flexible circuit board (FPC) is used in the bluetooth headset to save space. However, since the flexible circuit board has various wiring and shape positions, the design and implementation of the antenna are affected.
In the prior art, Smith Chart (Smith Chart) is a frequently used aid for technicians. Technicians often use smith charts to calculate and represent impedance characteristics of impedance elements such as antennas.
Disclosure of Invention
It is an object of the present invention to provide a new type of antenna arrangement.
According to an aspect of the present invention, there is provided an antenna device, comprising: a first earth formation; a second subterranean formation located below the first subterranean formation, wherein the second subterranean formation contains a motherboard, and the first subterranean formation is connected to the second subterranean formation; and an antenna element located adjacent to the first ground layer and forming a coupling with the first ground layer through the coupling slot.
Preferably, the antenna element includes a feeding point and a loop antenna connected to the feeding point, the feeding point is disposed on the main board and electrically connected to the main board, and the loop antenna and the first ground layer are spaced to form a coupling slot.
Preferably, before impedance matching is performed on the antenna device, a radiation frequency range of the antenna element is satisfied within a range of plus or minus 30 degrees on a smith chart centering on a center point of the smith chart; the center point of the Smith chart is a preset resonance point.
Preferably, at least one of the width of the coupling slot, the length of the loop antenna, and the width of the loop antenna is set such that a radiation frequency range of the antenna element is satisfied within a range of plus or minus 30 degrees on a smith chart centering on a center point of the smith chart.
Preferably, the antenna device is a bluetooth antenna device; the radiation frequency range is a frequency range of 2.4GHz to 2.5 GHz.
Preferably, the antenna element is flush with or below the first formation relative to the second formation.
Preferably, the second floor comprises a main board and a battery, or comprises a main board and a flexible circuit board, and the main board is connected with the battery or the flexible circuit board through a conductive piece; the first ground layer is connected with the battery or the flexible circuit board.
preferably, the method further comprises the following steps: a third earth formation; the third ground layer is located below the second ground layer and is connected with the second ground layer through a second flexible circuit board.
Preferably, the distance between the first stratum and the second stratum is not less than 2 mm.
Preferably, the width of the coupling slot is greater than 1 mm.
According to another aspect of the present invention, there is provided an electronic device characterized by including the antenna device described above.
One technical effect of the present invention is that a compact antenna device can be provided.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic front view of an antenna arrangement according to an embodiment.
Fig. 2 is a schematic side view of an antenna arrangement according to an embodiment.
Fig. 3 is a schematic side view of a variant of the antenna arrangement according to an embodiment.
Fig. 4 is an impedance characteristic of an unmatched antenna arrangement according to an embodiment, represented using smith charts.
Fig. 5 is a schematic diagram of the current distribution of the multilayer circuit board at resonance.
Fig. 6 is another schematic diagram of the current distribution of the multilayer circuit board at resonance.
Fig. 7 is a schematic illustration of a portion of the current of an antenna arrangement according to an embodiment.
Fig. 8 is a schematic front view of an antenna device according to another embodiment.
Fig. 9 is an impedance characteristic of a multilayer ground structure in an antenna device according to an embodiment, which is represented using a smith chart.
fig. 10 is an S11 characteristic of an antenna arrangement according to one embodiment.
fig. 11-14 are various variations of an antenna arrangement according to an embodiment.
Fig. 15 is an impedance characteristic of a multi-layer in a conventional antenna device, which is represented using a smith chart.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Various embodiments and examples according to the present invention are described below with reference to the accompanying drawings.
Here, a solution is proposed in which the antenna element is arranged in the vicinity of a multilayer (at least two-layer) circuit board, wherein a coupling is formed between the antenna element and the at least one layer of circuit board by means of a coupling slot. Here, "coupling" means that the antenna radiation of the antenna device is substantially influenced, i.e. the antenna element co-acts with the circuit board so that the entire antenna device as a whole forms the antenna radiation. In this way, the space occupied by the antenna device can be reduced, making the antenna device more compact. Such an antenna arrangement is particularly suitable for wearable devices, such as bluetooth headsets, or other small devices requiring wireless communication.
As shown in fig. 1, the antenna device 10 includes a first ground layer and a second ground layer located below the first ground layer. Wherein the second stratum comprises the main board, the first stratum and the second stratum which are connected. The first formation area is comparable to the second formation area, i.e. the first formation area is not much smaller than the second formation area, and vice versa. The ground layer refers to a circuit with ground layer wiring formed by a flexible circuit board FPC, a flexible-rigid board, a conventional RF4PCB or other materials.
It should be noted that the ground layer refers to a circuit having a grounding function, and the circuit may also integrate other functions. For example, the second ground layer includes a main board, i.e., the main board with the ground circuit is regarded as the second ground layer. Or the second ground layer comprises a main board and a battery or comprises a main board and a flexible circuit board, the main board is connected with the battery or the flexible circuit board through a conductive piece, and the first ground layer is connected with the battery or the flexible circuit board. In this case, the battery or the flexible circuit board is a circuit having a ground wiring. In the present application, the first ground layer and the second ground layer may be implemented by circuit boards having ground layer wiring, that is, by the first circuit board and the second circuit board. The following description will be made by taking an example in which the first ground layer and the second ground layer are implemented by the first circuit board and the second circuit board, respectively.
That is, the antenna device 10 includes a first circuit board 201 and a second circuit board 202 located below the first circuit board. The second circuit board 202 is connected to the first circuit board 201. For example, the second circuit board 202 is connected to the first circuit board 201 through the first flexible circuit board 204.
Fig. 2 shows a side view of the antenna device 10. As shown in fig. 2, the second circuit board 202 is connected to the first circuit board 201 through the first flexible circuit board 204.
Further, the antenna device 10 may further include a third ground layer located below the second ground layer and connected to the second ground layer through a second flexible circuit board.
That is, the antenna device 10 further includes: a third circuit board 203 located below the second circuit board 202. As shown in fig. 2, the third circuit board 203 may be connected to the second circuit board 202 through a second flexible circuit board 205. For example, the third circuit board may be a circuit board for a battery or equivalent battery space, and/or a flexible circuit board.
Fig. 3 shows a variant of the embodiment. As shown in fig. 3, the circuit boards 202, 203 together constitute a second circuit board, and the second circuit board is connected to the first circuit board 201 through the first flexible circuit board 204. For example, the circuit boards 202, 203 are connected by conductive foam, spring, etc. to form a second ground plane.
Further, in the case where the circuit board of the three-layer structure, that is, the antenna device 10 includes the first circuit board 201, the second circuit board 202, and the third circuit board 203, the second circuit board 202 is a main board. The first flexible circuit board 204 and the second flexible circuit board 205 are elongated.
As shown in fig. 1, the antenna device 10 further includes an antenna element 102 located near the first circuit board 201 and forming a coupling slot 103 with the first circuit board 201.
As shown, the antenna element 102 may be annular. It will be appreciated by those skilled in the art that the antenna element 102 may be other shapes, such as rectangular, other polygonal shapes, etc. The antenna element 102 surrounds the periphery of the first circuit board 201, and is spaced apart from the first circuit board 201 by a gap 103, which is different from the prior art.
In the antenna device disclosed herein, the antenna element may be combined with a circuit board to some extent. The antenna arrangement disclosed herein is more compact relative to prior art antenna arrangements. This is particularly advantageous for small electronic device applications.
For example, the antenna element 102 may be flush with the first circuit board 201 or lower than the first circuit board 201 relative to the second circuit board 202. This further contributes to reducing the space occupied by the antenna device.
Although not shown in the drawings, a support member such as a frame or a stay may be provided in an electronic device to which the antenna device is applied to fix the positions of the antenna element and the respective circuit boards.
Further, the distance between the first and second circuit boards, and/or the distance between the second and third circuit boards is greater than 1 mm. For example, the distance between the first circuit board 201 and the second circuit board 202 is not less than 2 mm. That is, the distance between the first ground layer and the second ground layer is not less than 2mm, so that the coupling between the circuit boards can be well avoided.
Further, the width of the coupling slot is larger than 1 mm.
The performance of the antenna device can be optimized by setting the impedance of the antenna device. Since the antenna element is coupled to the circuit board and thus affects the radiation characteristics of the entire antenna device, the impedance of the antenna device is considered here, not the impedance of the antenna element. Here, for example, as shown in fig. 1, the antenna element 102 includes a feeding point 101.
For example, the antenna element 102 includes a feeding point 101 and a loop antenna connected to the feeding point 101. The feeding point 101 may be disposed on the main board and electrically connected to the main board. The loop antenna and the first ground layer, i.e. the first circuit board 201, are spaced to form a coupling slot 103.
In the field of antenna design, smith charts are commonly used to represent the radiation frequency of an antenna. Therefore, before impedance matching is performed on the antenna device, the radiation frequency range of the antenna element is within plus or minus 30 degrees on the smith chart centering on the center point of the smith chart; the center point of the smith chart is a preset resonance point. In the antenna device in the present application, it is a parallel resonance, and point P in fig. 4 represents a parallel resonance point of the antenna device, that is, a preset resonance point. In this case, the radiation frequency range of the antenna element satisfies the relationship of the center point P and the positive horizontal axis (x axis)The angle being between-30 and +30, i.e. 60 in fig. 40Within the range. At this time, the antenna device is in parallel resonance.
Further, the radiation frequency may be adjusted by setting at least one of the width of the coupling slot, the length of the loop antenna, and the width of the loop antenna so that the radiation frequency range of the antenna element satisfies a range of plus or minus 30 degrees on the smith chart centering on the center point of the smith chart. In other words, the antenna radiation frequency can be embodied by the shape and structure of the antenna element to some extent. That is, in the antenna device, after the center point of the smith chart is set in advance, the radiation frequency of the antenna device is adjusted within the range of plus or minus 30 degrees around the center point of the smith chart by adjusting each element of the antenna.
It should be noted that the center point of the smith chart can be set according to actual requirements, and the present invention is not limited thereto.
further, with this arrangement, the relative position between the connection between the ground layers and the antenna feed does not have a major effect on the mode of operation between the antenna element and the multilayer circuit board(s). For example, in the two-layer ground structure shown in fig. 3, there is one connection portion (the first flexible circuit board 204) that does not have a large influence on the natural resonance frequency between the multiple-layer ground structures.
Fig. 5 shows a schematic diagram of a current distribution in the case where the radiation frequency of the antenna device is not set as in fig. 4 above. In fig. 5, the current is indicated by arrows. As shown in fig. 5, generally, the current is mainly distributed in the first flexible circuit board 204 and the second flexible circuit board 205. When the plurality of circuit boards are at natural resonance, there is a strong current distribution on the first flexible circuit board 204 and the second flexible circuit board 205. The current distribution on the first flexible circuit board 204 and the second flexible circuit board 205 is equal to the current distribution on the circuit boards 201, 202, 203. The circuit board is in a parallel resonance state under a natural resonance condition.
Fig. 6 and 7 are schematic diagrams showing current distributions in the case where the radiation frequency of the antenna device is set as in fig. 4. Here, the antenna device is adjusted to a state of parallel resonance.
As shown in fig. 6, when radiation is performed, current is mainly distributed in the first circuit board 201. The parallel resonance mode of the exciting antenna is adopted, the parallel natural resonance of the circuit board is restrained, and therefore the multilayer circuit board is in excited radiation. The current distribution in fig. 6 differs from that in fig. 5. The current is moved from the stronger area connection section (the first flexible circuit board 204, the second flexible circuit board 205 for connecting the first, the second, and the third circuit boards 201, 202, 203) to an edge position of the first circuit board 201 near the antenna element 102. The current flow in the other circuit boards and the flexible circuit board in the multilayer circuit board is significantly reduced. This minimizes the influence of the multilayer circuit board on the antenna element.
As shown in fig. 7, coupling occurs mainly between the first circuit board 201 and the antenna element 102. In this case, the other circuit board has less influence on the performance of the antenna element. This makes it easier to manufacture a satisfactory antenna device. Therefore, the antenna device can have better performance than the antenna device which sets the radiation frequency as shown in fig. 5 and 9. In fig. 7, solid lines indicate the current paths and the sizes of the antenna elements, and broken lines indicate the coupling currents on the first circuit board 201. The antenna element is strongly coupled to the first circuit board 201 in terms of current distribution. The degree of coupling may be determined by the coupling gap 103. As the degree of coupling increases, the resonant frequency of the antenna element shifts. The antenna device may be provided in a case where the radiation frequency characteristics shown in the smith chart of fig. 4 are satisfied. Such an antenna arrangement has a good performance.
Fig. 8 shows an example of an antenna device whose radiation frequency is set according to the smith chart of fig. 4. As shown in fig. 8, the antenna device includes a feeding point 301, an antenna element 302, a coupling slot 303, a first circuit board 401, a second circuit board 402, a third circuit board 403, and a flexible circuit board 404.
The smith chart may not only show the radiation frequency of the antenna device but also the impedance characteristics of the antenna device. Fig. 9 shows the impedance of the multi-ground structure in the antenna device of fig. 8 and when radiating using a conventional antenna device. The antenna device is not impedance-matched. In fig. 9, in the smith chart, a solid line indicates an impedance characteristic exhibited by the circuit board after the antenna element is removed in the conventional antenna device. For example, as the frequency is varied from 1.5GHz to 3GHz, the impedance varies from the solid line hollow start to the solid end. The dotted lines represent impedance characteristics exhibited by the circuit board after the antenna elements are removed in the antenna device of fig. 8. For example, as the frequency is varied from 1.5GHz to 3GHz, the impedance varies from the open start of the dashed line to the solid end. It should be noted that although fig. 9 and 4 are both smith charts, the objects represented by them are different. In fig. 9, point a represents the impedance at the first parallel resonance (i.e., the natural resonance frequency) of the circuit board of the multilayer structure (multi-ground layer) employing the conventional antenna. In fig. 9, point B represents the impedance at the first parallel resonance (i.e., the natural resonance frequency) of the circuit board of the multilayer structure (multi-layer) of fig. 8. As shown in fig. 9, although the conventional antenna device can also be used for antenna radiation, since the impedance of the circuit board of fig. 8 contains more reactive components, it is easier to adjust the antenna device shown in fig. 8 to avoid unnecessary resonance of the ground layer. As can be seen from the smith chart of fig. 9, the first parallel resonance is suppressed and the impedance is higher in the circuit board of fig. 8. When the matching element is added to the antenna device, the suppression effect on the natural resonant frequency of the multi-stratum is more obvious in the antenna device of fig. 8.
Fig. 10 is an S11 characteristic of the antenna device of fig. 8 and a conventional antenna device to which a matching element is added. As shown in fig. 10, a solid line indicates the resonance characteristic of the conventional antenna device, and a broken line indicates the resonance characteristic of the antenna device shown in fig. 8. As shown in fig. 10, an unnecessary resonance C (a dashed circle) exists in the solid line, and an unnecessary resonance (a solid circle) D in the dashed line is suppressed. As can be seen from fig. 10, the conventional antenna device has a weak effect of suppressing natural resonance of the multi-ground structure. In addition, the conventional antenna device also has a narrower bandwidth at 2.4GHz than that of the antenna device shown in fig. 8 due to the multi-ground structure. Conventional antenna arrangements create additional unwanted resonances that do not radiate energy efficiently. Furthermore, if the unwanted resonance of the antenna device of the multi-ground structure occurs in the vicinity of 2.4GHz, this narrows the bandwidth of the conventional antenna device due to a sharp change in impedance. As shown in fig. 10, the antenna device of the multi-ground structure of the conventional antenna forms a resonance at 1.9GHz, which affects a bandwidth at 2.4 GHz. The antenna device shown in fig. 8 can suppress the resonance caused by the multilayer (ground) structure well. For example, for some bluetooth antenna devices, such as bluetooth headsets, the natural resonant frequency of the multilayer (ground) structure is around 2 GHz. The antenna arrangement shown in fig. 8 may further improve the bandwidth and efficiency of the antenna arrangement.
Therefore, the antenna apparatus shown in fig. 8 may have better performance than a conventional antenna apparatus, such as a quarter-wavelength IFA antenna.
Fig. 15 is a multilayer impedance characteristic of the conventional antenna device represented using a smith chart. As shown in fig. 15, legend L, M, N represents a two-layer circuit and two three-layer circuit board configurations, respectively, where each layer of circuit board includes a ground plane. For example, L denotes a configuration of a conventional antenna element and a circuit board, wherein the circuit board-equipped device includes two layers of circuit boards. M denotes a conventional antenna element and circuit board configuration, wherein the circuit board configuration comprises a three-layer circuit board. N denotes a configuration comprising a three-layer circuit board, wherein the circuit board configuration comprises a three-layer circuit board, and a conventional antenna element, wherein the connection circuit board 24 is located on a side close to the feeding point of the antenna element. In fig. 15, E denotes the position of the 50 ohm matching impedance. As shown in fig. 15, as the number of layers of the circuit board increases, the impedance of the circuit board of the conventional antenna approaches a position where the impedance is matched by 50 ohms. This makes it difficult to adjust the impedance characteristics of the antenna device and can have an effect on the antenna radiation.
Generally, the influence of the triple-layer structure on the antenna element is considerable. As shown in fig. 15, the triple-layer structure will affect the impedance of the antenna. As can be seen from fig. 15, the impedance of the triple-layer structure is much easier to approach to the system impedance (50 ohms) than the two-layer structure, which means that it is harder to influence the natural resonance of the triple-layer structure and its unwanted radiation by adjusting the size and matching of the antenna elements. Furthermore, this may also result in a narrowing of the bandwidth of the antenna arrangement.
For example, the antenna device is a bluetooth antenna device, and the radiation frequency range is a frequency range of 2.4GHz to 2.5 GHz. The antenna device is, for example, a bluetooth headset antenna.
with the above arrangement, the antenna device can have a more flexible configuration. For example, in the antenna device of fig. 8, the second circuit board 402 is a quadrangle and includes first, second, third, and fourth sides in order, where the first side and the third side are opposite, and the second side and the fourth side are opposite. The first and third sides are shorter relative to the second and fourth sides. The feeding point 301 is located on the first side, and the first flexible circuit board 304 is located on one of the second and fourth sides near the feeding point 301. For example, the second side is closer to the feeding point 301 than the fourth side is to the feeding point 301, and the first flexible circuit board 304 is disposed on the second side.
With the prior art approach, it is difficult to place the connecting flexible circuit board close to the feeding point as in fig. 8. The antenna device provided herein is advantageous in terms of design freedom.
For example, various antenna device configurations are shown in fig. 11-14, wherein the antenna device includes more than two layers of circuit boards, i.e., includes at least two layers of circuit boards. Due to the adoption of the arrangement, the connection between the circuit boards is more flexible.
For example, as shown in fig. 11 to 14, the antenna device includes a feeding point 501, a first circuit board 601, and a second circuit board 602. Further, the antenna device further includes a third circuit board 603 located below the second circuit board 602. The first circuit board 601 and the second circuit board 602 are connected by a first flexible circuit board 604. The third circuit board 603 is connected to the second circuit board 602 through a second flexible circuit board 605. As shown in fig. 12 and 14, the second flexible circuit board 605 is located on one of the second side and the fourth side near the feeding point 501.
For example, at least one of the first, second, and third circuit boards 601, 602, and 603 is a flexible circuit board. By using a flexible circuit board, the design of the electronic device is more flexible.
The three-layer structure (three-layer structure) shown in fig. 11 to 14 can have a flexible configuration. The length, width and coupling slot of the antenna element may be adjusted to set the impedance characteristics of the antenna arrangement. For example, the antenna element in the antenna device of the three-layer structure may be set shorter than that of the two-layer structure.
It will be understood by those skilled in the art that the length of the antenna is referred to herein as the electrical length. For example, the length of the antenna may be 1/2 wavelength of the operating frequency, which is the electrical length at the parallel resonant frequency point of the antenna, unlike a conventional half-wavelength loop antenna. Furthermore, since one of the multiple (ground) layers is close to the antenna element, for example, they form a coupling slot 103, the electrical length of the antenna device after being affected by the coupling is about 1/2 wavelength when the antenna device is in the vicinity of the parallel resonance frequency point.
For example, the distance between the first and second circuit boards 601, 602 and the distance between the second and third circuit boards 602, 603 are greater than 1mm, preferably not less than 2 mm. This may ensure better antenna performance.
in the above figures, feed point 301, antenna element 302, coupling slot 303, circuit boards 401-404 in fig. 8, feed point 501, antenna element 502, coupling slot 503, circuit boards 601-605 in fig. 11-14 may correspond to the corresponding components in fig. 1-3, 5-7, respectively.
Further, the antenna device described above can also be applied to electronic equipment. The electronic device comprises the antenna arrangement as described above. The electronic device is, for example, a bluetooth headset, a bluetooth watch, a mobile phone, a tablet computer, etc.
Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. An antenna device, comprising:
A first earth formation;
The second stratum is positioned below the first stratum, wherein the second stratum comprises a mainboard and a battery or comprises a mainboard and a flexible circuit board, and the mainboard is connected with the battery or the flexible circuit board through a conductive piece; the first ground layer is connected with the battery or the flexible circuit board; and
An antenna element located adjacent to the first ground layer and forming a coupling with the first ground layer through a coupling slot;
Wherein the ground layer is an electrical circuit having a grounding function.
2. The antenna device according to claim 1, wherein the antenna element includes a feeding point and a loop antenna connected to the feeding point, the feeding point is disposed on the main board and electrically connected to the main board, and the loop antenna is spaced apart from the first ground layer to form a coupling slot.
3. The antenna device according to claim 2, wherein the radiation frequency range of the antenna element is satisfied within a range of plus or minus 30 degrees on a smith chart centering on a center point of the smith chart before impedance matching is performed on the antenna device; the center point of the Smith chart is a preset resonance point.
4. The antenna device according to claim 2, wherein at least one of the width of the coupling slot, the length of the loop antenna, and the width of the loop antenna is set so that a radiation frequency range of the antenna element satisfies a range of plus or minus 30 degrees on a smith chart centering on a center point of the smith chart.
5. The antenna device according to claim 3, characterized in that the antenna device is a Bluetooth antenna device;
The radiation frequency range is a frequency range of 2.4GHz to 2.5 GHz.
6. The antenna device according to claim 1, characterized in that the antenna element is flush with or lower than the first ground layer with respect to the second ground layer.
7. The antenna device of claim 1, further comprising: a third earth formation;
The third ground layer is located below the second ground layer and is connected with the second ground layer through a second flexible circuit board.
8. The antenna device according to claim 1, wherein a distance between the first ground layer and the second ground layer is not less than 2 mm.
9. The antenna device according to claim 1, characterized in that the width of the coupling slot is larger than 1 mm.
10. An electronic device, characterized in that it comprises an antenna device according to claim 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810381487.0A CN108711668B (en) | 2018-04-25 | 2018-04-25 | Antenna device and electronic apparatus |
| PCT/CN2018/110895 WO2019205519A1 (en) | 2018-04-25 | 2018-10-18 | Antenna apparatus and electronic device |
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| CN201810381487.0A CN108711668B (en) | 2018-04-25 | 2018-04-25 | Antenna device and electronic apparatus |
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| CN108711668A CN108711668A (en) | 2018-10-26 |
| CN108711668B true CN108711668B (en) | 2019-12-13 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110165409B (en) * | 2019-05-31 | 2021-06-01 | 歌尔科技有限公司 | Antenna device and communication equipment |
| CN110323542B (en) * | 2019-06-28 | 2021-08-06 | 歌尔科技有限公司 | Antenna device and bluetooth headset |
| CN110444893B (en) * | 2019-08-16 | 2020-05-26 | 歌尔科技有限公司 | Monopole antenna bandwidth adjusting method and system |
| CN114824737B (en) | 2019-09-17 | 2025-01-10 | 华为技术有限公司 | Bluetooth Headset |
| CN110911819B (en) * | 2019-12-12 | 2021-10-22 | 深圳市思讯通信技术有限公司 | 2.4GHz high-frequency annular excitation element antenna |
| CN113079435B (en) * | 2021-04-07 | 2023-07-21 | 畅达星科技(深圳)有限公司 | Earphone |
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| CN101057365A (en) * | 2004-11-11 | 2007-10-17 | 脉冲芬兰有限公司 | Antenna component |
| TW201126811A (en) * | 2010-01-27 | 2011-08-01 | Chi Mei Comm Systems Inc | Antenna module |
| CN203251148U (en) * | 2012-06-08 | 2013-10-23 | 江苏大学 | Wireless energy dual-frequency receiving device for sensors |
| CN105785757A (en) * | 2016-04-28 | 2016-07-20 | 歌尔声学股份有限公司 | Watch antenna device and electronic watch |
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| US7652628B2 (en) * | 2008-03-13 | 2010-01-26 | Sony Ericsson Mobile Communications Ab | Antenna for use in earphone and earphone with integrated antenna |
| JP2015149405A (en) * | 2014-02-06 | 2015-08-20 | デクセリアルズ株式会社 | Antenna apparatus, antenna unit for non-contact power transmission, and electronic apparatus |
| CN203932307U (en) * | 2014-02-21 | 2014-11-05 | 上海安费诺永亿通讯电子有限公司 | Wrist-watch antenna and be provided with the wrist-watch of this wrist-watch antenna |
| CN104409869B (en) * | 2014-11-29 | 2017-10-27 | 青岛歌尔声学科技有限公司 | A kind of All-in-One antenna and a kind of Multifunction apparatus for telecommunications |
| CN205485353U (en) * | 2016-01-14 | 2016-08-17 | 昆山联滔电子有限公司 | Intelligent watch |
| US9640858B1 (en) * | 2016-03-31 | 2017-05-02 | Motorola Mobility Llc | Portable electronic device with an antenna array and method for operating same |
| WO2017222217A1 (en) * | 2016-06-22 | 2017-12-28 | 주식회사 아모텍 | Ring type antenna module and jig for manufacturing same |
| CN106842896B (en) * | 2016-12-26 | 2022-07-19 | 歌尔股份有限公司 | Wearable device, shell and antenna control method of wearable device |
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- 2018-04-25 CN CN201810381487.0A patent/CN108711668B/en active Active
- 2018-10-18 WO PCT/CN2018/110895 patent/WO2019205519A1/en active Application Filing
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| CN101057365A (en) * | 2004-11-11 | 2007-10-17 | 脉冲芬兰有限公司 | Antenna component |
| TW201126811A (en) * | 2010-01-27 | 2011-08-01 | Chi Mei Comm Systems Inc | Antenna module |
| CN203251148U (en) * | 2012-06-08 | 2013-10-23 | 江苏大学 | Wireless energy dual-frequency receiving device for sensors |
| CN105785757A (en) * | 2016-04-28 | 2016-07-20 | 歌尔声学股份有限公司 | Watch antenna device and electronic watch |
Also Published As
| Publication number | Publication date |
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| CN108711668A (en) | 2018-10-26 |
| WO2019205519A1 (en) | 2019-10-31 |
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