Antenna system and electronic device

Abstract

The embodiment of the application provides an antenna system and an electronic device, wherein the antenna system comprises a first antenna and a second antenna, the first antenna comprises a first radiator and a second radiator, and the second antenna comprises a first radiator and a third radiator; two ends of the first radiator are electrically connected to a ground plane respectively, a first end of the second radiator and a first end of the third radiator are relatively far away from each other and are connected or coupled to the first radiator respectively, a second end of the second radiator and a second end of the third radiator are oppositely arranged and form a gap, the antenna system feeds the first antenna through a first feeding connection point on the second radiator and feeds the second antenna through a second feeding connection point on the third radiator, a brand-new antenna system is constructed, high isolation between the first antenna and the second antenna can be realized, and meanwhile, miniaturization of an antenna aperture and a low SAR value can be realized.

Description

Technical Field

[0001] This application relates to the field of antennas, and in particular to an antenna system and electronic device. Background Technology

[0002] With the gradual development and popularization of 5G technology, more and more antennas need to be integrated into terminal devices. When multiple antennas are working, if the isolation between the antennas is not good, they will couple with each other, which will limit the data throughput of the terminal device, affect the user experience, and even cause path blockage or device damage when high-power transmission signals couple into other transceiver channels. Therefore, the mutual coupling between multiple antennas has become a problem that the industry urgently needs to solve.

[0003] In existing technologies, the mutual coupling between multiple antennas can be decoupled through orthogonal mode decoupling technology or mode decoupling technology, thereby improving the isolation between antennas.

[0004] However, orthogonal mode decoupling technology requires the antenna to have two or more orthogonal characteristic modes and different feeding designs to achieve decoupling. Mode cancellation decoupling technology requires sacrificing half of the antenna aperture to decouple the antennas, which will result in lower efficiency of individual antennas. Therefore, it is difficult to achieve miniaturization of antenna aperture while ensuring the efficiency of each antenna.

[0005] It is evident that in existing technologies, it is difficult to simultaneously achieve high antenna isolation and miniaturized antenna aperture for antennas with a single characteristic pattern. Summary of the Invention

[0006] The purpose of this application is to solve the problem in the prior art that it is difficult to simultaneously achieve high isolation and miniaturization of antenna aperture for antennas with a single characteristic mode. Therefore, this application provides an antenna system and electronic device that enables the first antenna and the second antenna to achieve high isolation at their respective radio frequency source ends (ground end and radio frequency end), thereby achieving high isolation between the first antenna and the second antenna (or can be understood as decoupling between the first antenna and the second antenna).

[0007] This application provides an antenna system.

[0008] The first antenna, the second antenna, and the ground plane; the first antenna includes a first radiator and a second radiator, and the second antenna includes a first radiator and a third radiator.

[0009] The two ends of the first radiator are electrically connected to the floor;

[0010] The first end of the second radiator is relatively far away from the first end of the third radiator, and is respectively connected to or coupled to the first radiator. The second end of the second radiator is arranged opposite to the second end of the third radiator, and forms a gap.

[0011] The second radiator includes a first feed connection point, through which the antenna system feeds the first antenna; the third radiator includes a second feed connection point, through which the antenna system feeds the second antenna.

[0012] The first radiator and the floor enclose a closed slot; the first radiator, the second radiator, the third radiator, and the gap enclose a non-closed slot. The first feed connection point of the second radiator is connected to the feed terminal of the first radio frequency source of the electronic device to receive the radio frequency signal output by the first radio frequency source, causing the first antenna to radiate outwards. The ground terminal of the first radio frequency source is connected to the floor. The second feed connection point of the third radiator is connected to the feed terminal of the second radio frequency source of the electronic device to receive the radio frequency signal output by the second radio frequency source, causing the second antenna to radiate outwards. The ground terminal of the second radio frequency source is connected to the floor.

[0013] In this embodiment, a novel antenna system is constructed by connecting a second radiator and a third radiator to the first radiator, and a first radio frequency (RF) source connected between the second radiator and the ground, and a second RF source connected between the third radiator and the ground. Based on this structure, the antenna enables the following: when the first RF source is excited, the current generated at the feed terminal of the first RF source on the first antenna and the current generated at the ground terminal of the first RF source on the ground are in the same direction; simultaneously, the current generated at the feed terminal of the second RF source on the second antenna and the current generated at the ground terminal of the second RF source on the ground are in a convection mode. Similarly, when the second RF source is excited, the current generated at the feed terminal of the first RF source on the first antenna and the current generated at the ground terminal of the first RF source on the ground are in a convection mode; simultaneously, the current generated at the feed terminal of the second RF source on the second antenna and the current generated at the ground terminal of the second RF source on the ground are in the same direction.

[0014] Since the co-current mode and the convection mode are orthogonal, that is, when the first RF source is excited, the current mode generated at the two ends (ground end and feed end) of the first antenna connected to the first RF source is orthogonal to the current mode generated at the two ends (ground end and feed end) of the second antenna connected to the second RF source. Similarly, when the second RF source is excited, the current mode generated at the two ends (ground end and feed end) of the first antenna connected to the first RF source is orthogonal to the current mode generated at the two ends (ground end and feed end) of the second antenna connected to the second RF source is also orthogonal. Therefore, the embodiments of this application can use this structure to achieve the following: when the first antenna and the second antenna are excited at the same time, by making the first antenna and the second antenna have a high degree of isolation at their respective RF source ends (ground end and feed end), a high degree of isolation is achieved between the first antenna and the second antenna, that is, the decoupling of the first antenna and the second antenna is realized.

[0015] Furthermore, in this embodiment, since the first antenna and the second antenna share the first radiator, two antennas can be constructed with the same aperture as the traditional closed slot antenna, thereby increasing the bandwidth efficiency of the antenna by at least one time. In other words, under the same bandwidth efficiency, the antenna system of this embodiment can reduce the antenna aperture by at least half compared to the traditional closed slot antenna. Therefore, this embodiment can achieve miniaturization of the antenna aperture compared to the traditional closed slot antenna.

[0016] In some possible embodiments, along the width direction of the closed slot, the non-closed slot is located on the side of the first radiator closer to the closed slot.

[0017] In some possible embodiments, along the width direction of the closed slot, the non-closed slot is located on the side of the first radiator away from the closed slot.

[0018] In some possible embodiments, along the thickness direction of the closed groove, the unclosed groove partially overlaps with the first radiator and is located on the side of the first radiator away from the floor.

[0019] In some embodiments, the antenna system further includes an adjustment device, one end of which is connected to the first radiator and the other end of which is connected to the ground; the adjustment device is a capacitor and / or an inductor.

[0020] In this embodiment, the direction of the current in the closed slot can be adjusted by a capacitor or inductor located between the first radiator and the ground. Specifically, by selecting a capacitor or inductor that matches the antenna aperture, the direction of the current flow in the closed slot can be adjusted. This ensures that, when the first RF source is excited or the second RF source is excited, the current mode at the two ends of the first antenna connected to the first RF source (i.e., the feed end and the ground end) and the current mode at the two ends of the second antenna connected to the second RF source (i.e., the feed end and the ground end) are orthogonal. This means that there is a high degree of isolation between the first antenna and the second antenna. At the same time, it allows for a wide range of choices for the antenna aperture (or the length of the closed slot), providing a basis for the application of the antenna system in different application scenarios.

[0021] In some embodiments, the first radiator, the second radiator, the third radiator, and the gap form a non-closed slot, and along the length direction of the non-closed slot, the connection point formed by the adjustment device and the first radiator is located between the first feed connection point and the second feed connection point.

[0022] In some possible embodiments, the grounding point formed by the adjustment device and the ground plane is located between the first feed grounding point formed by the grounding terminal of the first RF source and the ground plane, and the second feed grounding point formed by the grounding terminal of the second RF source and the ground plane.

[0023] In some possible embodiments, the grounding point formed by the connection between the regulating device and the floor is located on the floor area opposite to the gap, and the connection point formed by the connection between the regulating device and the first radiator is located on the radiator segment opposite to the gap on the first radiator.

[0024] In some embodiments, a capacitor is provided at the gap, with its two ends connected to the second end of the second radiator and the second end of the third radiator, respectively.

[0025] In some embodiments, both the second and third radiators are L-shaped.

[0026] In some embodiments, the second radiator has one or more first slits, and / or the third radiator has one or more second slits.

[0027] In some possible embodiments, one of the second and third radiators is L-shaped, and the other radiator includes an L-shaped radiator segment and at least one suspended radiator segment, wherein the end of the L-shaped radiator segment away from the at least one suspended radiator segment constitutes a first end of the other radiator, and the end of the at least one suspended radiator segment away from the L-shaped radiator segment constitutes a second end of the other radiator.

[0028] Another radiator receives radio frequency signals through an L-shaped radiator segment or any of the at least one suspended radiator segment;

[0029] or:

[0030] Both the second radiator and the third radiator include an L-shaped radiator segment and at least one suspended radiator segment. In the second radiator, the end of the L-shaped radiator segment away from the at least one suspended radiator segment constitutes the first end of the second radiator, and the end of the at least one suspended radiator segment away from the L-shaped radiator segment constitutes the second end of the second radiator. The first feed connection point is located in the L-shaped radiator segment or any of the at least one suspended radiator segment in the second radiator.

[0031] In the third radiator, the end of the L-shaped radiator segment away from at least one suspended radiator segment constitutes the first end of the third radiator, and the end of at least one suspended radiator segment away from the L-shaped radiator segment constitutes the second end of the third radiator. The second feed connection point is located in the L-shaped radiator or any of the at least one suspended radiator segment in the third radiator.

[0032] In some embodiments, a capacitor is provided at at least one of the first and second gaps.

[0033] In some possible embodiments, a capacitor is provided at each first slit and each second slit.

[0034] In some possible embodiments, the L-shaped radiator segment is capacitively connected to at least one end of the suspended radiator segment near the L-shaped radiator segment;

[0035] When at least one suspended radiator segment is multiple suspended radiator segments, each suspended radiator segment is connected to the adjacent suspended radiator segment via a capacitor.

[0036] The embodiments of this application utilize an L-shaped radiator segment and at least one suspended radiator segment, and the radiator segments are connected by capacitors to form a second radiator and / or a third radiator. Such a structure can further help to miniaturize the antenna aperture and help to reduce the SAR (Specific Absorption Ratio) of the antenna system.

[0037] In some embodiments, the length of the closed slot is greater than or equal to half the wavelength of the first antenna or the second antenna and less than one wavelength of the first antenna or the second antenna.

[0038] In some possible embodiments, the first feed ground point formed by connecting the ground terminal of the first RF source to the ground plane and the first feed connection point formed by connecting the feed terminal of the first RF source to the second radiator are both located on one side of the gap, and the second feed ground point formed by connecting the ground terminal of the second RF source to the ground plane and the second feed connection point formed by connecting the feed terminal of the second RF source to the third radiator are located on the other side of the gap; and the first feed ground point formed by connecting the ground terminal of the first RF source to the ground plane and the second feed ground point formed by connecting the ground terminal of the second RF source to the ground plane are both located within the closed slot.

[0039] In some possible embodiments, the first feed ground point formed by connecting the ground terminal of the first radio frequency source to the ground plane and the first feed connection point formed by connecting the feed terminal of the first radio frequency source to the second radiator are aligned along the width direction of the closed slot, and the second feed ground point formed by connecting the ground terminal of the second radio frequency source to the ground plane and the second feed connection point formed by connecting the feed terminal of the second radio frequency source to the third radiator are aligned along the width direction of the closed slot.

[0040] In some embodiments, the first radio frequency source and the second radio frequency source are different radio frequency sources or the same radio frequency source.

[0041] This application provides an electronic device, including the antenna system provided in any of the above embodiments or any possible embodiments.

[0042] In some embodiments, the first radiator is formed by the metal frame of the electronic device or an embedded metal structure embedded in the metal frame, and the second and third radiators are both formed by the metal structure of the electronic device, or are both formed on the bracket of the electronic device by laser direct forming process.

[0043] In some embodiments, the first radiator is formed by the metal frame of the electronic device, and the second and third radiators are both formed by embedded metal structural members embedded in the metal frame of the electronic device.

[0044] In some embodiments, the first radiator is formed from the metal battery cover of the electronic device or the metal frame of the electronic device; the second and third radiators are both formed from the metal frame of the electronic device, or both are formed from embedded metal structural members embedded in the metal frame, or both are formed on the bracket of the electronic device by laser direct forming process. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the antenna system according to an embodiment of this application;

[0046] Figure 2aThis is a three-dimensional structural diagram of an antenna system in an electronic device according to an embodiment of this application; wherein, the second radiator and the third radiator are both L-shaped, and along the width direction of the closed slot, the non-closed slot is located on the side of the first radiator closer to the closed slot;

[0047] Figure 2b for Figure 2a A partially enlarged schematic diagram of the antenna system;

[0048] Figure 3 A schematic diagram of a closed slot single antenna for a reference design;

[0049] Figure 4a and Figure 4b The above are comparison curves of S-parameter performance and antenna efficiency obtained when the closed slot single antenna of a reference design and the antenna system of the embodiment of this application were simulated and tested, respectively.

[0050] Figure 5 This is a schematic diagram of the principle structure of the antenna system according to an embodiment of this application; wherein, an adjustment device is provided between the first radiator and the ground, and a capacitor is provided between the second radiator and the third radiator;

[0051] Figure 6a This is a three-dimensional structural diagram of the antenna system in the electronic device according to an embodiment of this application;

[0052] Figure 6b for Figure 6a A partially enlarged schematic diagram of the antenna system;

[0053] Figure 7 This is a graph showing the S-parameter effect obtained during simulation testing of the antenna system according to an embodiment of this application.

[0054] Figure 8 This is a comparison curve of antenna efficiency obtained when the antenna system of the embodiment of this application is tested under different closed slot lengths during simulation;

[0055] Figure 9a , Figure 9b , Figure 9c This table contains SAR value data obtained from simulation tests of electronic devices using a closed slot single antenna with a reference design and electronic devices using antenna systems with different closed slot lengths according to embodiments of this application.

[0056] Figure 10a and Figure 10b The diagrams show a first schematic diagram and a three-dimensional schematic diagram of the antenna system according to an embodiment of this application, wherein the number of the suspended radiating body segment is one.

[0057] Figure 10cThis is a schematic diagram of the second principle structure of the antenna system according to an embodiment of this application;

[0058] Figure 11a This is a schematic diagram of the third principle structure of the antenna system according to an embodiment of this application;

[0059] Figure 11b , Figure 11c All of these are third-dimensional structural diagrams of the antenna system according to embodiments of this application;

[0060] Figure 12 and Figure 13 The above are comparison curves of S-parameter performance and antenna efficiency obtained from simulation tests of the antenna system in this application embodiment when there is one suspended radiator segment and two suspended radiator segments, respectively.

[0061] Figure 14a , Figure 14b The table shows SAR value data obtained from simulation effect tests of electronic devices using antenna systems with one suspended radiator segment and two suspended radiator segments, respectively, according to the embodiments of this application.

[0062] Figure 15 A three-dimensional structural diagram of an open-slot dual antenna for a reference design;

[0063] Figure 16a , Figure 16b These are all perspective structural diagrams of the antenna system according to embodiments of this application; wherein, the second radiator and the third radiator are both L-shaped, and along the thickness direction of the closed slot, the non-closed slot is located on the side of the first radiator away from the floor;

[0064] Figure 17 and Figure 18 The S-parameter performance comparison curves and antenna efficiency comparison curves are obtained by conducting simulation effect tests on a reference design with a single open slot antenna (i.e., case 1), a reference design with a dual open slot antenna (i.e., case 2), and the antenna system of the embodiment of this application, respectively.

[0065] Figure 19a , Figure 19b The table shows SAR value data obtained from simulation effect tests of an electronic device using an open slot single antenna (i.e., case 1) with a reference design and an electronic device using an antenna system according to an embodiment of this application.

[0066] Figure 20 This is a three-dimensional structural diagram of the antenna system according to an embodiment of this application; wherein, the number of suspended radiating segments is two;

[0067] Figure 21 and Figure 22The above are comparison curves of S-parameter performance and antenna efficiency obtained from simulation tests of the antenna systems of the embodiments of this application.

[0068] Figure 23a , Figure 23b These are tables of SAR value data obtained from simulation effect tests of electronic devices using antenna systems according to embodiments of this application;

[0069] Figure 24a and Figure 24b The diagram shows the principle structure and three-dimensional structure of the antenna system according to an embodiment of this application; wherein, along the width direction of the closed slot, the non-closed slot is located on the side of the first radiator away from the closed slot, and both the first radiator and the second radiator are L-shaped;

[0070] Figure 25a and Figure 25b These are schematic diagrams illustrating two principles and structures of the antenna system according to embodiments of this application; wherein there are two suspended radiating segments.

[0071] Figure 26 and Figure 27 The S-parameter effect curves and antenna efficiency curves are obtained by simulating the antenna system of the embodiment of this application.

[0072] Figure 28a This is a three-dimensional structural diagram of the antenna system according to an embodiment of this application;

[0073] Figure 28b , Figure 28c These are schematic diagrams illustrating the principle structure of the switching circuits SW1 and SW2 of the antenna system according to embodiments of this application.

[0074] Figure 29 The above are the S-parameter effect curves obtained by simulating the antenna system of the embodiment of this application when both switch circuits SW1 are in the first connection state and both switch circuits SW2 are in the second connection state.

[0075] Figure 30 This is a comparison curve of antenna efficiency obtained by performing simulation tests on the antenna system of the embodiment of this application when both the switching circuit SW1 and the switching circuit SW2 are in the first connection state and when both are in the second connection state.

[0076] Figure 31 This is a three-dimensional structural diagram of the antenna system according to an embodiment of this application;

[0077] Figure 32 The S-parameter effect curves are obtained from the simulation effect test of the antenna system of the embodiment of this application;

[0078] Figure 33This is a comparison curve of antenna efficiency obtained from simulation testing of the antenna system of the embodiment of this application;

[0079] Figure 34 This is a schematic diagram of the antenna system according to an embodiment of this application;

[0080] Figure 35 , Figure 36 The S-parameter effect curves and antenna efficiency curves are obtained by simulating the antenna system of the embodiment of this application.

[0081] Explanation of reference numerals in the attached figures:

[0082] 1: Antenna system;

[0083] 10: Gap;

[0084] 11: First radiator; 111, 112: Radiating branches; 12: Second radiator; 121: Connector; 122: L-shaped radiator segment; 13: Third radiator; 131: Connector; 132: L-shaped radiator segment; 14: Closed slot; 15: Unclosed slot; 16: Adjustment device; 17: Suspended radiator segment; 18: Slit;

[0085] 20: PCB board; 21: RF source connector; 22: RF source connector; 23: duplexer;

[0086] RF: Radio frequency source; RF1: First radio frequency source; RF2: Second radio frequency source; C: Capacitor; C1: Capacitor; C2: Capacitor; L, L A L B L C L D :inductance;

[0087] A1: First feeder connection point; A2: Second feeder connection point; A3: Connection point; B1: First feeder grounding point; B2: Second feeder grounding point; B3: Grounding point; B4: Grounding point; B5: Grounding point;

[0088] SW1: Switching circuit; SW2: Switching circuit;

[0089] K1: Switch; K2: Switch;

[0090] L1: Length of the closed groove; L2: Length of the non-closed groove; L3: Length of the gap; L4, L5, L6, L7: Length;

[0091] w: Width of the closed groove; n: Width of the non-closed groove; x: Width. Detailed Implementation

[0092] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application will be presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details will be included in the following description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0093] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0094] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0095] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0096] In the description of this application, it should be understood that "electrical connection" can be understood as physical contact and electrical conduction between components; it can also be understood as the form of connection between different components in a circuit structure through physical lines that can transmit electrical signals, such as copper foil or wires on a printed circuit board (PCB). "Coupled through..." can be understood as electrical conduction through indirect coupling. Indirect coupling can be understood as contactless coupling. Those skilled in the art will understand that coupling refers to a phenomenon where there is close cooperation and mutual influence between the inputs and outputs of two or more circuit elements or electrical networks, and energy is transferred from one side to the other through interaction. To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0097] Please see Figure 1 , Figure 1 This is a schematic diagram of the antenna system according to an embodiment of this application.

[0098] like Figure 1 As shown in the figure, this application provides an antenna system including a first antenna and a second antenna. The first antenna includes a first radiator 11 and a second radiator 12, and the second antenna includes a first radiator 11 and a third radiator 13. That is, the first radiator 11 is a shared radiator for the first antenna and the second antenna.

[0099] The two ends of the first radiator 11 are respectively connected to the floor, forming grounding points B3 and B4 on the floor. The two ends of the first radiator 11 can be directly connected to the floor, or indirectly connected to the floor through connectors such as conductors or wires. The first radiator 11 and the floor enclose a closed groove 14 (i.e., as shown in the image). Figure 2a The closed groove 14 shown is understood as a through groove that is closed on all four sides.

[0100] In one implementation, please refer to Figure 1 and combined Figure 2a and Figure 2b understand, Figure 2a This is a three-dimensional structural diagram of the antenna system in the electronic device according to an embodiment of this application. Figure 2b This is a partially enlarged schematic diagram of the antenna system in an electronic device according to an embodiment of this application. The first ends of the second radiator 12 and the third radiator 13 are relatively far apart and are respectively connected to the first radiator 11. The second ends of the second radiator 12 and the third radiator 13 are arranged end-to-end with a gap 10. The first radiator 11, the second radiator 12, the third radiator 13 and the gap 10 enclose a non-closed slot 15 (i.e., as shown in the diagram). Figure 2aThe non-closed groove 15 shown. This non-closed groove can be understood as a through groove with an opening, wherein the opening is formed by the gap 10.

[0101] In other embodiments, the first end of the second radiator 12 and the first end of the third radiator 13 may also be coupled to the first radiator, that is: the first end of the second radiator 12 is not directly connected to the first radiator 11, and a gap is formed between them, through which the radiated energy is coupled; the first end of the third radiator 13 is also not directly connected to the first radiator 11, and a gap is formed between them, through which the radiated energy is coupled.

[0102] The gap can be formed along the width direction parallel to the closed groove, or it can be formed along the thickness direction parallel to the closed groove.

[0103] It should be noted that: one end or the first end, the second end is not limited to the end face of the radiator, but can also be a section of the radiator including the end face, such as a radiator section within 1 to 2 mm from the end face.

[0104] Furthermore, the second radiator 12 can also be coupled through a coupling branch located in the gap between the second radiator 12 and the first radiator 11. This coupling branch can be connected to the first radiator 11 or not. Similarly, the third radiator 13 can also be coupled through a coupling branch located in the gap between the third radiator 13 and the first radiator 11. This coupling branch can be connected to the first radiator 11 or not. The size of the aforementioned gap and coupling branch is not limited, as long as it meets the requirements for energy coupling, it does not depart from the scope of this application.

[0105] The second radiator 12 includes a first feed connection point A1, through which the antenna system 1 feeds the first antenna. The third radiator 13 includes a second feed connection point A2, through which the antenna system 1 feeds the second antenna.

[0106] Specifically, the first feed connection point A1 of the second radiator 12 is connected to the feed terminal of the first radio frequency source RF1 of the electronic device to receive the radio frequency signal output by the first radio frequency source RF1, causing the first antenna to radiate outwards. The ground terminal of the first radio frequency source RF1 is connected to the ground. The second feed connection point A2 of the third radiator 13 is connected to the feed terminal of the second radio frequency source RF2 of the electronic device to receive the radio frequency signal output by the second radio frequency source RF2, causing the second antenna to radiate outwards. The ground terminal of the second radio frequency source RF2 is connected to the ground. The second radiator 12 can be directly connected to the feed terminal of the first radio frequency source RF1 of the electronic device, or it can be connected via a radio frequency source connector 21 (such as...). Figure 2a As shown in the diagram, for example, spring-loaded feet, wires, etc., are connected to the feed terminal of the first RF source RF1. Similarly, the third radiator 13 can be directly connected to the feed terminal of the second RF source RF2 of the electronic device, or it can be connected through the RF source connector 22 (such as...). Figure 2a As shown in the diagram, for example, springs, wires, etc. are connected to the feed terminal of the second radio frequency source RF2.

[0107] In this embodiment, the second radiator 12 can be connected to the first radio frequency source RF1 via a coaxial cable, specifically through the inner core of the coaxial cable connected to the feed terminal of the first radio frequency source RF1. The third radiator 13 can also be connected to the second radio frequency source RF2 via a coaxial cable, specifically through the inner core of the coaxial cable connected to the feed terminal of the second radio frequency source RF2. Of course, those skilled in the art will understand that the feed terminal can also be other alternative solutions, and this does not limit the scope of protection of this application.

[0108] It should be noted that in this embodiment, the first radio frequency source RF1 and the second radio frequency source RF2 are different radio frequency sources.

[0109] Furthermore, a capacitor C is provided between the second radiator 12 and the third radiator 13. The capacitor C is used to adjust the position of the reverse point (which can be understood as mentioned later) generated when the current flows through each radiator and the ground plane. This allows the current mode generated at the two ends (ground end and feed end) of the first antenna connected to the first RF source on the first antenna to be orthogonal to the current mode generated at the two ends (ground end and feed end) of the second antenna connected to the second RF source on the second antenna, thereby achieving high isolation between the first antenna and the second antenna. Of course, those skilled in the art will understand that a capacitor may not be provided between the second radiator 12 and the third radiator 13; it is sufficient to ensure the orthogonality of the current modes during design to achieve high isolation between the first antenna and the second antenna.

[0110] The antenna system of this embodiment can be applied to various electronic devices with signal transmission functions, such as watches, mobile phones, wearable smart devices, and smart home devices. The type of antenna system is not limited; for example, it can be a 5G mobile communication antenna (MIMO), such as a primary LTE transceiver antenna or a secondary LTE transceiver antenna, or a short-range communication antenna, such as a V2X-1 transceiver antenna, a WiFi / BLE antenna, or a radio antenna. Furthermore, in this embodiment, the first antenna and the second antenna can operate in the same frequency band, such as any frequency band within 6 GHz, or they can operate in different frequency bands; for example, the center frequencies of the first antenna and the second antenna in their operating frequency bands can differ by 1 GHz. Specifically, the first antenna and the second antenna can operate in sub-bands with a frequency range of 724-788 MHz, a frequency range of 791-860 MHz, a frequency range of 824-894 MHz, and a frequency range of 880-960 MHz, etc.

[0111] Furthermore, such as Figure 2a and Figure 2b As shown, taking a mobile phone as an example, the first radiator 11 in this embodiment can be formed from the metal frame of the mobile phone, such as the outer metal frame of the mobile phone, or it can be formed from an embedded metal structural component within the metal frame of the mobile phone. The second radiator 12 and the third radiator 13 can be formed from the metal structural components of the mobile phone, such as metal sheets, or they can be formed on the phone's bracket using a laser direct forming process, or they can be structural components attached to the vicinity of the antenna using an FPC process, such as on the phone's bracket or battery cover. The second radiator 12 and the third radiator 13 can be directly connected to the first radiator 11, or they can be indirectly connected to the first radiator 11 through connectors 121 and 131, respectively. Connector 121 constitutes a part of the second radiator 12, and connector 131 constitutes a part of the third radiator 13. Connectors 121 and 131 can be, for example, spring-loaded feet, welded components, conductive foam, metal structural components, etc. The ground plane can be at least part or at least part of any grounding structure in the electronic device. For example, the ground plane can be formed by the PCB board 20 in the mobile phone. Other examples include conductive sheets, the bottom frame of the electronic device, the copper layer of the display screen, etc.

[0112] Furthermore, the processing technology of each component in this embodiment is not limited. For example, the first radiator 11 can be soldered onto the PCB board 20, or it can be formed directly on the PCB board 20 after a closed groove 14 is formed by processing a closed groove on all four sides on the PCB board. Of course, those skilled in the art will understand that other alternative solutions are also possible, which do not limit the scope of protection of this application.

[0113] For specific details of the work process, please refer to Figure 1 , Figure 1 The solid arrow in the middle represents the current formed in each radiator and on the floor when the first radio frequency source RF1 is excited. Figure 1 The dashed arrows represent the currents formed in the radiators and the ground plane when the second RF source RF2 is used for excitation. The circles in the figure show the reversal points of the current as it flows through the radiators and the ground plane. When the first RF source RF1 is used for excitation, the current generated at the first feed connection point A1 of the first antenna (i.e., the feed terminal connected to the first RF source) is as follows: Figure 1 As shown by the solid arrow closest to the first feed connection point A1, the current generated at the first feed ground point B1 of the first antenna (i.e., the grounding terminal connected to the first RF source on the ground) is as follows: Figure 1 As shown by the solid arrow closest to the first feed ground point B1, it can be seen that the current flows from the first feed connection point A1 through the ground plane to the first feed ground point B1, meaning the current pattern at the first feed connection point A1 and the first feed ground point B1 of the first antenna is in the same direction. Simultaneously, the current generated at the second feed connection point A2 of the second antenna (i.e., the feed terminal connected to the second RF source) is as follows... Figure 1 As shown by the solid arrow closest to the second feed connection point A2, the current generated at the second feed ground point B2 of the second antenna (i.e., the grounding terminal connected to the second RF source on the ground) is as follows: Figure 1 As shown by the solid arrow closest to the second feed grounding point B2, it can be seen that the current at the second feed connection point A2 flows in the opposite direction to the current at the second feed grounding point B2. That is, the current mode of the second feed connection point A2 and the second feed grounding point B2 of the second antenna is convection mode.

[0114] When the second radio frequency source RF2 is excited, the current generated at the first feed connection point A1 of the first antenna (i.e., the feed terminal connected to the first radio frequency source) is as follows: Figure 1 As shown by the dashed arrow closest to the first feed connection point A1, the current generated at the first feed ground point B1 of the first antenna (i.e., the grounding terminal connected to the first RF source on the floor) is as follows: Figure 1 As shown by the dashed arrow closest to the first feed ground point B1, it can be seen that the current at the first feed connection point A1 is in the opposite direction to the current at the first feed ground point B1, meaning the current pattern at the first feed connection point A1 and the first feed ground point B1 of the first antenna is a convection mode. Simultaneously, the current generated at the second feed connection point A2 of the second antenna (i.e., at the feed terminal connected to the second RF source) is as follows... Figure 1 As shown by the dashed arrow closest to the second feed connection point A2, the current generated at the second feed ground point B2 of the second antenna (i.e., the grounding terminal connected to the second RF source on the floor) is as follows: Figure 1 As shown by the dashed arrow closest to the second feed grounding point B2, it can be seen that the current flows from the second feed grounding point B2 into the second feed connection point A2, that is, the current mode of the second feed connection point A2 and the second feed grounding point B2 of the second antenna is in the same direction.

[0115] Therefore, whether the first RF source RF1 or the second RF source RF2 is used for excitation, the current mode of the first antenna at both ends of the first RF source RF1 (first feed connection point A1 and first feed ground point B1) and the current mode of the second antenna at both ends of the second RF source RF2 (second feed connection point A2 and second feed ground point B2) can always form mode orthogonality, thereby producing a high degree of isolation.

[0116] In this embodiment, a novel antenna system is constructed by connecting a second radiator and a third radiator to the first radiator, and a first radio frequency source connected between the second radiator and the ground, and a second radio frequency source connected between the third radiator and the ground. Based on this structure, the antenna system enables:

[0117] When the first RF source is excited, the current generated at the feed terminal of the first RF source connected to the first RF source on the first RF line (i.e., the first feed connection point A1) and the current generated at the ground terminal of the first RF source connected to the ground on the ground (i.e., the first feed ground point B1) are in the same direction. At the same time, the current generated at the feed terminal of the second RF source connected to the second RF source on the second RF line (i.e., the second feed connection point A2) and the current generated at the ground terminal of the second RF source connected to the ground on the ground (i.e., the second feed ground point B2) are in the convection mode.

[0118] Similarly, when the second RF source is used for excitation, the current generated at the feed terminal of the first RF source connected to the first RF source on the first day line (i.e., the first feed connection point A1) and the current generated at the ground terminal of the first RF source connected to the ground on the ground (i.e., the first feed ground point B1) are in a convection mode; at the same time, the current generated at the feed terminal of the second RF source connected to the second RF source on the second day line (i.e., the second feed connection point A2) and the current generated at the ground terminal of the second RF source connected to the ground on the ground (i.e., the second feed ground point B2) are in a co-current mode.

[0119] Furthermore, since the co-current mode and the convection mode are orthogonal, that is, when the first RF source is excited, the current mode generated at the two ends (ground end and feed end) of the first antenna connected to the first RF source is orthogonal to the current mode generated at the two ends (ground end and feed end) of the second antenna connected to the second RF source. Similarly, when the second RF source is excited, the current mode generated at the two ends (ground end and feed end) of the first antenna connected to the first RF source is orthogonal to the current mode generated at the two ends (ground end and feed end) of the second antenna connected to the second RF source. Therefore, the embodiments of this application can use this structure to achieve the following: when the first antenna and the second antenna are excited at the same time, by making the first antenna and the second antenna have a high degree of isolation at their respective RF source ends, the first antenna and the second antenna can form a high isolation between them, thereby achieving decoupling between the first antenna and the second antenna.

[0120] The aforementioned reversal point can be understood as the current flowing through both sides of the reversal point in opposite directions. Figure 1 As can be seen, the first radiator 11 has a reverse point, and the ground has a reverse point. The reverse point on the first radiator 11 and the reverse point on the ground are misaligned along the length of the closed slot 14. This allows the current mode generated at the two ends (ground end and feed end) of the first antenna connected to the first radio frequency source to form a mode orthogonal relationship with the current mode generated at the two ends (ground end and feed end) of the second antenna connected to the second radio frequency source to form a mode orthogonal relationship, thereby achieving high isolation between the first antenna and the second antenna.

[0121] Furthermore, in this embodiment, since the first antenna and the second antenna share the first radiator, two antennas can be constructed with the same aperture as a traditional closed-slot single antenna, thereby increasing the antenna bandwidth efficiency by at least one time. In other words, under the same bandwidth efficiency, the antenna system of this embodiment can reduce the antenna aperture by at least half compared to a traditional closed-slot single antenna. Therefore, this embodiment can achieve miniaturization of the antenna aperture compared to a traditional closed-slot single antenna.

[0122] Furthermore, the embodiments of this application employ asymmetric power supply, eliminating the need to design complex power supply networks, such as antisymmetric power supply, which has the advantages of simple power supply structure and low sensitivity to complex environments.

[0123] This application also provides an electronic device, including the antenna system 1 described in any of the above embodiments.

[0124] Furthermore, in this embodiment, the first feed connection point A1 and the first feed ground point B1 of the first RF source RF1 are both located on one side of the gap 10, and the second feed connection point A2 and the second feed ground point B2 of the second RF source RF2 are both located on the other side of the gap 10. Moreover, the first feed ground point B1 of the first RF source RF1 and the second feed ground point B2 of the second RF source RF2 are both located within the closed slot 14, specifically, between ground point B3 and ground point B4. In some embodiments, the first feed connection point A1 of the first RF source RF1 and the second feed connection point A2 of the second RF source RF2 can be symmetrical about the gap 10; in other embodiments, they can be asymmetrical.

[0125] For further details, please see Figure 1 In this embodiment, the first feed connection point A1 and the first feed ground point B1 of the first RF source RF1, and the second feed connection point A2 and the second feed ground point B2 of the second RF source RF2 are aligned in the width direction w of the closed slot. Those skilled in the art will understand that alignment includes a completely aligned scheme and a roughly aligned scheme. Of course, in other alternative embodiments, an unaligned scheme can also be used.

[0126] Furthermore, in this embodiment, please refer to Figure 1 and combined Figure 2a and Figure 2b It is understood that both the second radiator 12 and the third radiator 13 are L-shaped, extending along the width w of the closed slot. The non-closed slot 15 is located on the side of the first radiator 11 closest to the closed slot 14. Alternatively, it can be understood that the second radiator 12 and the third radiator 13 are arranged parallel to the PCB board 20, and the gap formed by the second radiator 12 and the third radiator 13 is located on the side of the first radiator 11 closest to the PCB board 20. Those skilled in the art will understand that the L-shape also includes similar L-shaped designs.

[0127] Furthermore, the length L1 of the closed groove is greater than the length L2 of the unclosed groove. For example, it can be 1 to 2.5 times the length of the unclosed groove, or 1.3 to 2 times the length of the unclosed groove.

[0128] Furthermore, the length L1 of the closed slot is greater than or equal to half the wavelength of the first antenna or the second antenna and less than one wavelength of the first antenna or the second antenna. Please refer to [link to relevant documentation]. Figure 2b In this embodiment, the length L1 of the closed slot is 40mm. Of course, those skilled in the art will understand that the length L1 of the closed slot can also be other sizes to meet different IDs (i.e., the serial number of the electronic device) or different architectures.

[0129] As can be seen, the antenna system of this embodiment can realize two antennas using an antenna aperture of 1 / 2 wavelength (i.e., the length of the closed slot is equal to 1 / 2 wavelength of the first antenna or the second antenna). Compared with a single antenna with a closed slot, such as Figure 3 As shown, Figure 3 This is a schematic diagram of a closed slot single antenna for a reference design. This single antenna uses an antenna aperture of 1 / 2 times the antenna wavelength to realize only one antenna. The antenna system of this embodiment can increase the bandwidth by at least 100% while ensuring that the antenna aperture is the same as the single antenna described above. And while ensuring that the antenna bandwidth is the same as the single antenna described above, the antenna aperture can be reduced by half.

[0130] Simulation software was used to simulate and analyze a closed-slot single antenna of a reference design and the antenna system provided in this embodiment, and the results were as follows: Figures 4a-4b The effect curve shown is shown.

[0131] Get Figures 4a-4b The simulation results of the curves shown are shown in Table 1 below (please refer to the table below). Figure 2b , Figure 3 (Understood)

[0132] Table 1

[0133]

[0134]

[0135] Please see Figures 4a-4b , Figure 4a The graph shows a comparison of S-parameter performance obtained from simulation tests of a closed-slot single antenna of a reference design and an antenna system according to an embodiment of this application. Figure 4b The graph shows the antenna efficiency comparison obtained when the closed slot single antenna of a reference design and the antenna system of the embodiment of this application were simulated.

[0136] exist Figure 4a In the diagram, the horizontal axis represents frequency in GHz, and the vertical axis represents S-parameters. The dashed line represents the S21 amplitude value in dB. S21 is one of the S-parameters, characterizing the antenna isolation. The smaller the S21 value, the greater the isolation between antennas and the less the antenna coupling. Isolation is expressed as the absolute value of S21. The solid line represents the S11 amplitude value in dB. S11 is also one of the S-parameters. S11 represents the reflection coefficient, which characterizes the antenna's transmission efficiency. Specifically, the smaller the S11 value, the lower the antenna return loss, the less energy the antenna reflects back, meaning more energy actually enters the antenna.

[0137] from Figure 4aAs can be seen, within the operating frequency range of 1.5-2.8GHz, the S11 value of a closed-slot single antenna is approximately -7dB to 0dB, while the S11 value of the antenna system in this embodiment is approximately -9dB to -0dB. Therefore, the S11 parameters of each antenna in the antenna system of this embodiment are superior to those of the closed-slot single antenna. Figure 4a It can also be seen that in the operating frequency range of 1.5-2.8GHz, the S21 parameter of the antenna system in this embodiment is less than -17dB, that is, the isolation between the first antenna and the second antenna in the antenna system can almost reach more than 17dB. Furthermore, in the frequency bands of 1.9GHz to 1.95GHz and 2GHz to 2.75GHz, the S21 parameter is less than -20dB, that is, the isolation can reach more than 20dB. Therefore, it can be seen that the antenna system in this embodiment has a high degree of isolation.

[0138] exist Figure 4b In the diagram, the horizontal axis represents frequency in GHz, and the vertical axis represents the antenna's radiation efficiency and system efficiency. The dashed line represents radiation efficiency, and the solid line represents system efficiency. Radiation efficiency is a measure of an antenna's radiation capability; metal loss and dielectric loss are both factors affecting radiation efficiency. System efficiency is the actual efficiency after considering antenna port matching; that is, the antenna's system efficiency is the antenna's actual efficiency (i.e., efficiency). Those skilled in the art will understand that efficiency is generally expressed as a percentage, and there is a corresponding conversion relationship between it and dB. The closer the efficiency is to 0 dB, the better the antenna's efficiency.

[0139] from Figure 4b As can be seen, within the operating frequency range of 1.83-1.98 GHz, the system efficiency of the first antenna in the antenna system is approximately -10 dB to -5.5 dB, and the radiation efficiency is approximately -6 dB to -4.9 dB. The system efficiency of the closed-slot single antenna is approximately -10 dB to -6.5 dB, and the radiation efficiency is approximately -5.3 dB to -4.2 dB. It should be noted that because the efficiency curve of the second antenna is similar to that of the first antenna, therefore... Figure 4b Only the antenna efficiency curve of the first antenna is shown. It is evident that the system efficiency and radiation efficiency of the first and second antennas in the antenna system of this embodiment are superior to those of a single closed-slot antenna.

[0140] Please see Figures 5-6b , Figure 5 This is a schematic diagram of the antenna system according to an embodiment of this application; Figure 6a This is a three-dimensional structural diagram of the antenna system in the electronic device according to an embodiment of this application; Figure 6b for Figure 6a A partially enlarged schematic diagram of the antenna system.

[0141] Please see Figure 5 The structure of the antenna system in this embodiment is basically the same as... Figure 1 The antenna system shown has the same structure, the difference being that an adjustment device 16 is provided between the first radiator and the ground. The adjustment device 16 can be a capacitor or an inductor L; any device capable of adjusting the position of the reverse point generated when current flows through each radiator and the ground is within the scope of this application. In this embodiment, the adjustment device 16 is an inductor L. It should be understood that... Figure 5 and Figure 1 The solutions can be combined.

[0142] The adjustment device 16 is used to adjust the position of the reverse point generated when the current flows through each radiator and the ground, so that the current mode generated at the two ends (ground end and feed end) of the first antenna connected to the first radio frequency source on the first antenna and the current mode generated at the two ends (ground end and feed end) of the second antenna connected to the second radio frequency source on the second antenna form a mode orthogonal, thereby forming a high isolation between the first antenna and the second antenna.

[0143] Furthermore, the connection point A3 formed by the connection between the regulating device 16 and the first radiator 11 is located between the first feed connection point A1 and the second feed connection point A2.

[0144] Furthermore, the grounding point B5 formed by the adjustment device 16 and the ground is located between the first feed grounding point B1 of the first RF source RF1 and the second feed grounding point B2 of the second RF source RF2.

[0145] Furthermore, the grounding point B5 formed by the connection between the regulating device 16 and the floor is located on the floor area opposite to the gap 10, and the connection point A3 formed by the connection between the regulating device 16 and the first radiator 11 is located on the radiator segment of the first radiator 11 opposite to the gap 10.

[0146] It should be noted that in some embodiments, the capacitor C may not be provided between the second radiator 12 and the third radiator 13, and only the adjustment device 16 between the first radiator 11 and the floor is used, such as an inductor to adjust the position of the reverse point. In other embodiments, the adjustment device 16 may not be provided, and the position of the reverse point may be adjusted only by the capacitor C between the second radiator 12 and the third radiator 13, or neither the capacitor C nor the adjustment device 16 may be provided.

[0147] In addition, in this embodiment, the length L1 of the closed groove is 72mm (e.g., Figure 6a As shown in the figure, it is approximately 7 / 8 of the wavelength of the first or second antenna.

[0148] Simulation software was used to perform simulation analysis on the antenna system provided in this embodiment under different closed slot lengths, and the results were as follows: Figures 7-8 The effect curve shown is shown.

[0149] Get Figures 7-8 The simulation effect parameters of the curves shown are shown in Table 2 below (please refer to the table below). Figure 6a and Figure 6b (Understood)

[0150] Table 2

[0151]

[0152]

[0153] It should be noted that "disconnected" in the table above can be understood as the corresponding device (such as capacitor C, inductor L) not being used or not being set.

[0154] Please see Figures 7-8 , Figure 7 The above is a graph showing the S-parameter effect obtained during simulation testing of the antenna system according to an embodiment of this application. Figure 8 This is a comparison curve of antenna efficiency obtained when simulating the antenna system of this application embodiment under different closed slot lengths.

[0155] from Figure 7 As can be seen, within the operating frequency range of 1.8GHz to 2.3GHz, the S11 value of the antenna system in this embodiment is approximately -12dB to -0.01dB, and the S21 parameter of the antenna system in this embodiment is approximately -37dB to -25dB. Since it is less than -25dB, the isolation can reach more than 25dB. Therefore, the antenna system in this embodiment has a high degree of isolation.

[0156] from Figure 8 As can be seen, within the operating frequency range of 1.85GHz to 2.3GHz, the antenna system of this embodiment exhibits a system efficiency of approximately -10dB to -4.15dB and a radiation efficiency of approximately -4.5dB to -3.8dB when the closed slot length is 40mm. When the closed slot length is 72mm, the system efficiency of the first antenna is approximately -10dB to -3.27dB, and the radiation efficiency is approximately -3.9dB to -2.5dB. It should be noted that, since the efficiency curve of the second antenna is similar to that of the first antenna, therefore... Figure 8 Only the antenna efficiency curve of the first antenna is shown. It can be seen that in this embodiment, the antenna system with a closed slot length of 72mm has better system efficiency and radiation efficiency than the antenna system with a closed slot length of 40mm.

[0157] Simulation software was used to simulate and analyze electronic devices employing a closed slot antenna of a reference design, and electronic devices using antenna systems of this embodiment with different closed slot lengths, and the results were obtained as follows: Figures 9a-9c The table shows SAR value data.

[0158] Get Figures 9a-9c The simulation effect parameters of the SAR value data table shown are shown in Table 3 below (please refer to the table below for details). Figure 3 , Figure 6a and Figure 6b (Understood)

[0159] Table 3

[0160]

[0161]

[0162] exist Figures 9a-9c In English, SAR (Specific Absorption Rate) refers to the electromagnetic power absorbed by a unit mass of human tissue, measured in W / kg. Internationally, SAR values ​​are commonly used to measure the thermal effects radiated by electronic devices. The normalized SAR value represents the SAR measured when the antenna efficiency is normalized to -5 dB (i.e., the normalized efficiency shown in the table). "Back-5mm" indicates a scenario where the back of the electronic device is 5mm away from the body, and "Bottom-5mm" indicates a scenario where the bottom of the electronic device is 5mm away from the body.

[0163] from Figure 9a As can be seen, the SAR value of the closed slot single antenna measured in the scenario with an output power of 24dBm, a resonant frequency of 2GHz and a distance of -5mm between the back of the electronic device and the body is 1.4W / kg, and the SAR value of the closed slot single antenna measured in the scenario with a distance of -5mm between the bottom of the electronic device and the body is 0.51W / kg.

[0164] from Figure 9b As can be seen, in this embodiment, the SAR value measured is 1.37W / kg in a scenario where the closed slot length is 40mm, the output power is 24dBm, the resonant frequency is 2GHz, and the back of the electronic device is -5mm away from the body. In a scenario where the bottom of the electronic device is -5mm away from the body, the SAR value measured is 1.1W / kg.

[0165] from Figure 9c As can be seen, in this embodiment, the SAR value measured is 0.95W / kg in a scenario where the closed slot length is 72mm, the output power is 24dBm, the resonant frequency is 2GHz, and the back of the electronic device is 5mm away from the body. The SAR value measured is 0.57W / kg in a scenario where the bottom of the electronic device is 5mm away from the body.

[0166] Therefore, this embodiment can effectively reduce the SAR value of the antenna compared to a single antenna with a closed slot.

[0167] comprehensive Figures 7 to 9c Simulation data shows that, compared to a single antenna with a closed slot, this embodiment not only achieves high isolation between the first and second antennas and miniaturizes the antenna aperture, but also effectively reduces the antenna's SAR value. In particular, when the length of the closed slot is 72mm, the SAR value can be reduced from 1.4W / kg to 0.95W / kg, a reduction of approximately 32%.

[0168] Please see Figure 10a The structure of the antenna system in this embodiment is basically the same as... Figure 5 The antenna systems shown have the same structure, differing only in that: one or more first slots are provided on the second radiator 12, and / or one or more second slots are provided on the third radiator 13. Alternatively, it can be understood that at least one of the second radiator 12 and the third radiator 13 includes an L-shaped radiator segment and a suspended radiator segment. The feed terminal of the first radio frequency source RF1 can be connected to the L-shaped radiator segment or the suspended radiator segment of the second radiator 12, and the feed terminal of the second radio frequency source RF2 can be connected to the L-shaped radiator segment or the suspended radiator segment of the third radiator 13. It should be understood that... Figure 10a The proposed solution can be combined with the solutions of the above embodiments.

[0169] Please see Figure 10a and Figure 10b , Figure 10a and Figure 10b The first schematic diagram and three-dimensional schematic diagram of the antenna system according to the present application are shown, wherein the number of suspended radiating body segments is 1.

[0170] The third radiator 13 is L-shaped, and the second radiator 12 includes an L-shaped radiator segment 122 and a suspended radiator segment 17. The suspended radiator segment 17 and the L-shaped radiator segment 122 are arranged end-to-end with a gap between them. The end of the L-shaped radiator segment 122 away from the suspended radiator segment 17 constitutes the first end of the second radiator 12, and the end of the suspended radiator segment 17 away from the L-shaped radiator segment 122 constitutes the second end of the second radiator 12.

[0171] The second radiator 12 receives radio frequency signals through the L-shaped radiator segment 122; that is, the feed terminal of the first radio frequency source RF1 is connected to the L-shaped radiator segment 122.

[0172] Of course, those skilled in the art will understand that in other alternative embodiments, the second radiator 12 may be L-shaped, and the third radiator 13 may include an L-shaped radiator segment and a suspended radiator segment 17. The end of the L-shaped radiator segment away from the suspended radiator segment 17 constitutes the first end of the third radiator 13, and the end of the suspended radiator segment 17 away from the L-shaped radiator segment constitutes the second end of the third radiator 13. Accordingly, the third radiator 13 receives radio frequency signals through the L-shaped radiator segment. That is, the feed terminal of the second radio frequency source RF2 is connected to the L-shaped radiator segment.

[0173] Furthermore, the suspended radiator segment 17 can be connected to the L-shaped radiator segment 122 via a capacitor, such as capacitor C1. The form of the capacitor is not limited; it can be a distributed coupling capacitor or a lumped capacitor, etc.

[0174] Please see Figure 10c , Figure 10c This is a schematic diagram of a second principle structure of the antenna system according to an embodiment of this application. The second structure is basically the same as the first structure, except that a capacitor is provided at at least one of the first and second slots. In this embodiment, a capacitor is provided at each first slot and each second slot. Specifically, there are two suspended radiator segments, which are connected by a capacitor C. The second radiator 12 includes an L-shaped radiator segment 122 and a suspended radiator segment 17 (i.e., Figure 10c The second radiator 12 has a suspended radiator segment 17 located on the left side. The suspended radiator segment 17 is connected to the L-shaped radiator segment 122 of the second radiator 12 via capacitor C1. The third radiator 13 includes an L-shaped radiator segment 132 and a suspended radiator segment 17 (i.e., the suspended radiator segment 17 is located on the left side of the second radiator 12). Figure 10c The suspended radiator segment 17 of the third radiator 13 is located on the right side. The suspended radiator segment 17 of the third radiator 13 is connected to the L-shaped radiator segment 132 of the third radiator 13 via capacitor C2. The feed terminal of the first radio frequency source RF1 is connected to the L-shaped radiator segment 122, and the feed terminal of the second radio frequency source RF2 is connected to the suspended radiator segment 17 of the third radiator 13. The suspended radiator segment 17 of the second radiator 12 can radiate outward as both the first and second radiators (in which case, the suspended radiator segment 17 of the second radiator 12 acts as another radiator in the second radiator that is not part of the third radiator).

[0175] Please see Figures 11a-11c , Figure 11a This is a schematic diagram of the third principle structure of the antenna system according to an embodiment of this application;

[0176] Figure 11b , Figure 11cAll of these are third-dimensional structural diagrams of the antenna system according to embodiments of this application; the third structure is basically the same as the second structure, except that: the feed end of the first radio frequency source RF1 is connected to the floating radiator segment 17 of the second radiator 12, and the feed end of the second radio frequency source RF2 is connected to the floating radiator segment 17 of the third radiator 13.

[0177] Of course, those skilled in the art will understand that there can be multiple suspended radiators in either the second radiator 12 or the third radiator 13. Taking the second radiator 12 as an example, when the second radiator 12 includes multiple suspended radiator segments, the L-shaped radiator segment 122 and the multiple suspended radiator segments 17 are sequentially arranged end-to-end at intervals. In this case, the end of the last suspended radiator segment away from the L-shaped radiator segment constitutes the second end of the second radiator 12. The feed terminal of the first radio frequency source RF1 can be connected to the L-shaped radiator segment 122 or any of the multiple suspended radiator segments 17. Furthermore, each suspended radiator segment 17 is connected to its adjacent suspended radiator segment via a capacitor. The first suspended radiator segment 17 is connected to the L-shaped radiator segment via a capacitor, and the last suspended radiator segment is connected to the second end of the third radiator 13 via a capacitor C.

[0178] The connection relationships in the third radiator are similar to those in the second radiator, and will not be repeated here.

[0179] Simulation software was used to perform simulation analysis on the antenna system of this embodiment with one and two suspended radiating segments, and the results were as follows: Figures 12-13 The effect curve shown is shown.

[0180] Get Figures 12-13 The simulation effect parameters of the curves shown are shown in Table 4 below (please refer to Table 4). Figure 10b , Figure 11b (Understood)

[0181] Table 4

[0182]

[0183]

[0184] Please see Figures 12-13 , Figure 12 The above are comparison curves of S-parameter performance obtained from simulation tests of the antenna system in this application when there is one suspended radiator segment and two suspended radiator segments. Figure 13 The antenna efficiency comparison curves obtained from simulation tests of the antenna system in this application embodiment with one suspended radiator segment and two suspended radiator segments are shown.

[0185] from Figure 12 As can be seen, within the operating frequency range of 1.8GHz to 2.1GHz, the S11 value of the antenna system of this embodiment is approximately -14dB to -1dB when there is one suspended radiator segment; the S11 value is approximately -13.5dB to -0.5dB when there are two suspended radiator segments; and the S21 value is approximately -54dB to -26dB when there is one suspended radiator segment, which is less than -25dB, meaning the isolation can reach above 25dB. The S21 value is approximately -24dB to -19dB when there are two suspended radiator segments, which is less than -20dB, meaning the isolation can reach above 20dB. Therefore, the antenna system of this embodiment has high isolation.

[0186] from Figure 13 As can be seen, within the operating frequency band of 1.9GHz to 2.1GHz, the antenna system of this embodiment, with one suspended radiator segment, has a system efficiency of approximately -4dB to -2.7dB and a radiation efficiency of approximately -2.5dB to -2.4dB for the first antenna. With two suspended radiator segments, the system efficiency of the first antenna is approximately -7dB to -2.7dB, and the radiation efficiency is approximately -3dB to -2.5dB. It should be noted that, since the efficiency curve of the second antenna is similar to that of the first antenna, therefore... Figure 13 Only the antenna efficiency curve of the first antenna is shown in the figure.

[0187] Simulation software was used to simulate and analyze the electronic equipment of the antenna system in this embodiment when there is one suspended radiating segment and when there are two suspended radiating segments, and the results were as follows. Figures 14a-14b The table shows SAR value data.

[0188] Get Figures 14a-14b The simulation effect parameters of the SAR value data table shown are shown in Table 5 below (please refer to Table 5). Figure 10b , Figure 11b (Understood)

[0189] Table 5

[0190]

[0191] from Figure 14a As can be seen, when there is one suspended radiator segment, the SAR value of the antenna is 0.86 W / kg when the output power is 24 dBm, the resonant frequency is 1.95 GHz and the back of the electronic device is 5 mm away from the body. The SAR value of the antenna is 0.53 W / kg when the bottom of the electronic device is 5 mm away from the body.

[0192] from Figure 14bAs can be seen, when there are two suspended radiator segments, the SAR value of the antenna is 0.89 W / kg when the output power is 24 dBm, the resonant frequency is 2 GHz, and the back of the electronic device is 5 mm away from the body. The SAR value of the antenna is 0.55 W / kg when the bottom of the electronic device is 5 mm away from the body.

[0193] Therefore, it can be seen that the SAR value of the antenna system with one suspended radiator segment is lower than that of the antenna system with two suspended radiator segments.

[0194] Please see Figure 16a and Figure 16b , Figure 16a , Figure 16b All are three-dimensional structural diagrams of the antenna system according to embodiments of this application; this embodiment and Figure 1 The antenna systems shown have basically the same structure, the difference being:

[0195] Both the second radiator 12 and the third radiator 13 are L-shaped, extending along the thickness direction of the closed groove (i.e., Figure 16a The non-closed slot 15 (perpendicular to the PCB board 20) partially overlaps with the first radiator 11 and is located away from the floor (e.g., in the direction perpendicular to the PCB board 20). Figure 16a The PCB board 20 shown is located on one side. This can also be understood as: relative to... Figure 1 The antenna system shown in this embodiment, in which the second radiator 12 and the third radiator 13 are... Figure 1 The antenna system shown is rotated 90° around the first radiator 11 in a direction away from the PCB board 20. This should be understood. Figure 16a The proposed solution can be combined with the solutions of the above embodiments.

[0196] This application also provides an electronic device including the antenna system 1 described in any of the above embodiments.

[0197] Furthermore, such as Figure 16a and Figure 16b As shown, taking a mobile phone as an example, in this embodiment, the first radiator 11 can be formed from the metal outer frame of the mobile phone, and the second radiator 12 and the third radiator 13 can be formed from embedded metal structural components, such as metal sheets, embedded within the metal frame of the mobile phone. Those skilled in the art will understand that the embedded metal structural components cover the interior of the mobile phone and do not affect the appearance of the mobile phone.

[0198] Figure 15 As a reference design, the slotted antenna can be designed as a single antenna to obtain a slotted single antenna, i.e., case 1, and as a dual antenna design to obtain a slotted dual antenna, i.e., case 2.

[0199] Simulation software was used to simulate and analyze the antenna system of a reference design with an open slot single antenna (i.e., case 1), a reference design with an open slot dual antenna (i.e., case 2), and this embodiment, and the results were obtained as follows. Figure 17 The effect curve shown in Figure 28.

[0200] Get Figures 17-18 The simulation effect parameters of the curves shown are shown in Table 6 below (please refer to Table 6). Figure 15 , Figure 16a , Figure 16b (Understood)

[0201] Table 6

[0202]

[0203] Please see Figures 17-18 , Figure 17 The above are comparison curves of S-parameter performance obtained from simulation tests of a reference design with an open slot single antenna (case 1), a reference design with an open slot dual antenna (case 2), and the antenna system of an embodiment of this application. Figure 18 The above is a comparison curve of antenna efficiency obtained by simulation test of the antenna system of an open slot single antenna (i.e., case 1), an open slot dual antenna (i.e., case 2) of a reference design, and an embodiment of this application.

[0204] from Figure 17 As can be seen, within the operating frequency range of 1.8GHz to 2.1GHz, the S11 value of the slotted single antenna (i.e., case 1) is approximately -5dB to -4.8dB, the S11 value of the slotted dual antenna (i.e., case 2) is approximately -6.5dB to -1.5dB, the S11 value of the antenna system in this embodiment is approximately -11.5dB to -2.5dB, the S21 value of the slotted dual antenna (i.e., case 2) is approximately -21dB to -13dB, and the S21 value of the antenna system in this embodiment is approximately -22dB to -15.5dB, meaning the isolation can reach over 20dB. Therefore, the antenna system in this embodiment has high isolation.

[0205] from Figure 18As can be seen, within the operating frequency range of 1.875GHz to 1.95GHz, the system efficiency of the slotted single antenna (case 1) is -3.5dB to -3.4dB, and the radiation efficiency is -1.8dB to -1.7dB. The system efficiency of the slotted dual antenna (case 2) is -7.8dB to -4.8dB, and the radiation efficiency is -3.5dB to -3.4dB. The antenna system of this embodiment has a system efficiency of -3.4dB to -3dB and a radiation efficiency of -3.8dB to -2.5dB. It should be noted that since the efficiency curve of the second antenna in this embodiment is similar to that of the first antenna, therefore... Figure 18 Only the antenna efficiency curve of the first antenna is shown in the figure.

[0206] Simulation software was used to simulate and analyze the electronic device of an open slot single antenna (i.e., case 1) of a reference design, and the electronic device of an antenna system using the embodiments of this application, and the results were obtained as follows. Figures 19a-19b The table shows SAR value data.

[0207] Get Figures 19a-19b The simulation effect parameters of the SAR value data table shown are shown in Table 7 below (please refer to Table 7). Figure 15 , Figure 16a (Understood)

[0208] Table 7

[0209]

[0210] from Figure 19a As can be seen, the SAR value of the slotted single antenna measured in the scenario with an output power of 24dBm, a resonant frequency of 1.85GHz and the back of the electronic device being -5mm away from the body is 0.85W / kg, while the SAR value of the slotted single antenna measured in the scenario with the bottom of the electronic device being -5mm away from the body is 1.31W / kg.

[0211] from Figure 19b As can be seen, the SAR value measured in this embodiment is 0.82W / kg when the output power is 24dBm, the resonant frequency is 1.9GHz, and the back of the electronic device is 5mm away from the body. The SAR value measured in this embodiment is 0.93W / kg when the bottom of the electronic device is 5mm away from the body.

[0212] Therefore, it can be seen that the antenna system in this embodiment has a lower SAR value compared to the slotted single antenna (case 1).

[0213] Please see Figure 20 , Figure 20This is a three-dimensional structural diagram of the antenna system according to an embodiment of this application; wherein, the number of suspended radiating segments is two; this embodiment and Figure 16a The antenna systems shown are basically the same in structure, except that the antenna system also includes two floating radiator segments. The floating radiator segments are connected by a capacitor C. The second radiator 12 includes an L-shaped radiator segment 122 and a floating radiator segment 17 (i.e., Figure 20 The third radiator 13 includes an L-shaped radiator segment 132 and a suspended radiator segment 17 (i.e., the suspended radiator segment 17 located on the left side). Figure 20 The floating radiator segment 17, located on the right side, has its feed terminal of the first radio frequency source RF1 connected to the L-shaped radiator segment 122, and the feed terminal of the second radio frequency source RF2 connected to the L-shaped radiator segment 132. It should be understood that... Figure 20 The proposed solution can be combined with the solutions of the above embodiments.

[0214] The antenna system of the embodiment of this application was simulated and analyzed using simulation software, and the results were as follows: Figures 21-22 The effect curve shown is shown.

[0215] Get Figures 21-22 The simulation effect parameters of the curves shown are shown in Table 8 below (please refer to Table 8). Figure 16a , Figure 20 (Understood)

[0216] Table 8

[0217]

[0218] Please see Figures 21-22 , Figure 21 The above is a comparison curve of S-parameter effects obtained from simulation testing of the antenna system of the embodiment of this application. Figure 22 The antenna efficiency comparison curve is obtained by simulating the antenna system of the embodiment of this application.

[0219] exist Figure 21 In the diagram, curves A1 and A2 represent the S11 and S21 values ​​of the antenna system in one embodiment of this invention, respectively, and curves B1 and B2 represent the S11 and S21 values ​​of the antenna system in another embodiment of this invention, respectively. Figure 21 As can be seen, within the operating frequency range of 1.8GHz to 2GHz, in one embodiment, the S11 value of the antenna system in this embodiment is approximately -10.5dB to -2.5dB, and the S21 value of the antenna system in this embodiment is approximately -19dB to -15dB. In another embodiment, the S11 value of the antenna system in this embodiment is approximately -10.5dB to -2.5dB, and the S21 value of the antenna system in this embodiment is approximately -19dB to -14dB.

[0220] exist Figure 22 In the diagram, curves A1 and A2 represent the system efficiency and radiation efficiency of the antenna system in one embodiment of this invention, respectively, while curves B1 and B2 represent the system efficiency and radiation efficiency of the antenna system in another embodiment of this invention, respectively. Figure 22 As can be seen, within the operating frequency range of 1.825GHz to 1.95GHz, in one embodiment, the system efficiency of this embodiment is -5dB to -3dB, and the radiation efficiency is -2.7dB to -2.4dB. In another embodiment, the system efficiency of the antenna system of this embodiment is -4dB to -2.2dB, and the radiation efficiency is -1.85dB to -1.8dB. It should be noted that, since the efficiency curve of the second antenna in this embodiment is similar to that of the first antenna, therefore... Figure 22 Only the antenna efficiency curve of the first antenna is shown in the figure.

[0221] The electronic equipment of the antenna system in the embodiment was simulated and analyzed using simulation software, and the results were obtained as follows: Figures 23a-23b The table shows SAR value data.

[0222] Get Figures 23a-23b The simulation effect parameters of the SAR value data table shown are shown in Table 9 below (please refer to Table 9). Figure 16a , Figure 20 (Understood)

[0223] Table 9

[0224]

[0225] from Figure 23a As can be seen, in one embodiment, the SAR value of this embodiment is 0.82 W / kg when the output power is 24 dBm, the resonant frequency is 1.9 GHz and the back of the electronic device is 5 mm away from the body, and the SAR value of the antenna system of this embodiment is 0.93 W / kg when the bottom of the electronic device is 5 mm away from the body.

[0226] from Figure 23b As can be seen from this, in another embodiment, the SAR value of this embodiment measured in a scenario where the output power is 24dBm, the resonant frequency is 1.95GHz, and the back of the electronic device is 5mm away from the body is 0.66W / kg, and the SAR value of the antenna system of this embodiment measured in a scenario where the bottom of the electronic device is 5mm away from the body is 0.57W / kg.

[0227] Therefore, it can be seen that the SAR value of the antenna system in another embodiment of this embodiment is lower than that of the antenna system in one embodiment of this embodiment.

[0228] Please see Figures 24a-24b , Figure 24a This is a schematic diagram of the antenna system according to an embodiment of this application. Figure 24b This is a three-dimensional structural diagram of the antenna system according to an embodiment of this application.

[0229] The second radiator 12 and the third radiator 13 are both L-shaped, extending along the width w of the closed groove. The non-closed groove 15 is located on the side of the first radiator 11 furthest from the closed groove 14. Alternatively, it can be understood as: relative to... Figure 5 The antenna system shown in this embodiment, in which the second radiator 12 and the third radiator 13 are... Figure 5 The antenna system shown is rotated 90° around the first radiator 11 in a direction away from the PCB board 20.

[0230] This application also provides an electronic device including the antenna system 1 described in any of the above embodiments.

[0231] Furthermore, such as Figure 20 As shown, taking a mobile phone as an example, the first radiator 11 in this embodiment can be formed from a metal battery cover, PCB board, structural frame, FPC board, or copper foil in the mobile phone. For example, a closed groove can be directly processed on the metal battery cover or PCB board to form the first radiator 11. The second radiator 12 and the third radiator 13 can be formed from the metal frame of the mobile phone or embedded metal structural components within the metal frame. They can also be formed on the bracket of the electronic device through laser direct forming process, or attached to structural components near the antenna through FPC process, such as on the bracket or battery cover of the mobile phone.

[0232] For further details, please refer to the diagram. Figures 25a-25b , Figure 25a This is a schematic diagram of the principle structure of an antenna system according to an embodiment of this application; Figure 25b This is a schematic diagram of another principle structure of the antenna system according to an embodiment of this application;

[0233] This embodiment and Figure 24a The antenna systems shown are basically the same in structure, except that the antenna system also includes two floating radiator segments. The floating radiator segments are connected by a capacitor C. The second radiator 12 includes an L-shaped radiator segment 122 and a floating radiator segment 17 (i.e., Figure 25a The second radiator 12 has a suspended radiator segment 17 located on the left side. The suspended radiator segment 17 is connected to the L-shaped radiator segment 122 of the second radiator 12 via capacitor C1. The third radiator 13 includes an L-shaped radiator segment 132 and a suspended radiator segment 17 (i.e., the suspended radiator segment 17 is located on the left side of the second radiator 12). Figure 25aThe suspended radiator segment 17 located on the right side of the third radiator 13 is connected to the L-shaped radiator segment 132 of the third radiator 13 via capacitor C2. In the first structure, as shown... Figure 25a As shown, the feed terminal of the first radio frequency source RF1 is connected to the floating radiator segment 17 of the second radiator 12, and the feed terminal of the second radio frequency source RF2 is connected to the floating radiator segment 17 of the third radiator 13. In the second structure, as... Figure 25b As shown, the feed terminal of the first radio frequency source RF1 is connected to the floating radiator segment 17 of the second radiator 12, and the feed terminal of the second radio frequency source RF2 is connected to the L-shaped radiator segment 132 of the third radiator 13. It should be understood that... Figure 24a The proposed solution can be combined with the solutions of the above embodiments.

[0234] This application also provides an electronic device including the antenna system 1 involved in any of the above embodiments.

[0235] The antenna system of this embodiment was simulated and analyzed using simulation software, and the results were as follows: Figures 26-27 The effect curve shown is shown.

[0236] Get Figures 26-27 The simulation results of the curves shown are shown in Table 10 below (please refer to the table for details). Figure 24b (Understood)

[0237] Table 10

[0238]

[0239]

[0240] Please see Figures 26-27 , Figure 26 The S-parameter effect curves are obtained by simulating the antenna system of the embodiment of this application. Figure 27 The above are comparison curves of antenna efficiency obtained by simulating the antenna systems of the embodiments of this application.

[0241] from Figure 26 As can be seen, within the operating frequency range of 1.9GHz to 2GHz, the S11 value of the antenna system in this embodiment is approximately -3.6dB to -14.2dB, and the S21 value is approximately -14dB to -12dB.

[0242] from Figure 27As can be seen, within the operating frequency range of 1.9GHz to 2GHz, the system efficiency of the antenna system in this embodiment is -4dB to -2.5dB, and the radiation efficiency is -2.5dB to -2.3dB. It should be noted that, since the efficiency curve of the second antenna in this embodiment is similar to that of the first antenna, therefore... Figure 27 Only the antenna efficiency curve of the first antenna is shown in the figure.

[0243] Please see Figures 28a-28b , Figure 28a This is a three-dimensional structural diagram of the antenna system according to an embodiment of this application. This embodiment is related to... Figure 1 The antenna systems shown have basically the same structure, the difference being:

[0244] The antenna system 1 also includes radiating stubs 111 and 112 located at both ends of the first radiator 11. Both radiating stubs 111 and 112 extend in a direction away from the first radiator 11, and the ends of radiating stubs 111 and 112 away from the first radiator 11 are free ends.

[0245] Radial branches 111 and 112 form openings between themselves and the PCB board 20. Specifically, the openings between radial branches 111 and the PCB board 20 are as follows: Figure 28a The slit 18 on the left side forms the slit 18 on the right side of Figure 28a between the radiating branch 112 and the PCB board 20. This should be understood. Figure 28a The proposed solution can be combined with the solutions of the above embodiments.

[0246] Furthermore, in this embodiment, both the radiating branch 111 and the radiating branch 112 are L-shaped. The horizontal portion of the radiating branch 111 and the horizontal portion of the radiating branch 112 are located on the same side as the first radiator 11. The vertical portion of the radiating branch 111 is located on a first side different from the first radiator 11, and the vertical portion of the radiating branch 112 is located on a second side different from the first radiator 11.

[0247] For further details, please refer to... Figure 28b and Figure 28c , Figure 28b , Figure 28c These are schematic diagrams of the principle structure of switch circuit SW1 and switch circuit SW2 in the antenna system of this application embodiment; the antenna system 1 of this embodiment also includes switch circuit SW1 connected between radiating stub 111 and PCB board 20 and switch circuit SW2 connected between radiating stub 112 and PCB board 20.

[0248] The switching circuit SW1 includes switch K1 and inductor L. A With inductor L BOne end of switch K1 is connected to radiating stub 111, and inductor L A One end is connected to the inductor L B One end of switch K1 is connected to PCB board 20, and switch K1 can switch between the first position and the second position. When switch K1 is in the first position, the other end of switch K1 is connected to inductor L. A At the other end, at this time, inductor L A Electrically connected between PCB board 20 and radiating stub 111, switch circuit SW1 is in the first connected state; when switch K1 is in the second position, the other end of switch K1 is connected to inductor L. B At the other end, at this time, inductor L B Electrically connected between PCB board 20 and radiating branch 111, the switching circuit SW1 is in the second connection state.

[0249] The working principle of switch circuit SW2 is similar to that of switch circuit SW1, as described above. Figure 28c This is understood and will not be elaborated upon here. Specifically, when the inductance L... C When electrically connected between PCB board 20 and radiating stub 112, switching circuit SW2 is in the first connection state, and when inductor L... D When electrically connected between PCB board 20 and radiating branch 112, the switching circuit SW2 is in the second connection state.

[0250] This application also provides an electronic device including the antenna system 1 described in any of the above embodiments.

[0251] Simulation software was used to simulate and analyze the antenna system of this embodiment when both switch circuits SW1 and SW2 were in the first connection state and when both were in the second connection state, and the results were obtained as follows. Figure 29 The effect curve shown is shown.

[0252] Get Figure 29 The simulation effect parameters of the curves shown are shown in Table 11 below (please refer to the table for details). Figures 28a-28c (Understanding), wherein the length and width of the closed slot, the length and width of the non-closed slot, and the parameters of the gap and capacitance in the antenna system are all consistent with those in this application. Figure 1 The structures shown are the same, so please refer to Table 1 above for specific values:

[0253] Table 11

[0254]

[0255] Please see Figures 29-30 , Figure 29The above are S-parameter effect curves obtained by simulating the antenna system of this application when both switch circuit SW1 and switch circuit SW2 are in the first connection state and when both are in the second connection state. Figure 30 For the purposes of this application Figure 1 The antenna efficiency comparison curves obtained from simulation tests of the antenna system shown, the antenna system switching circuit SW1 and switching circuit SW2 in the embodiment of this application, when both are in the first connection state and when both are in the second connection state. Figure 1 Please refer to Table 1 above for the simulation parameters of the antenna system shown.

[0256] from Figure 29 As can be seen from this embodiment, Figure 1 The antenna system shown, regardless of whether both switching circuits SW1 and SW2 are in the first connection state or both are in the second connection state, each antenna in the system can generate two resonances (i.e., dual resonances). When both switching circuits SW1 and SW2 are in the first connection state, the resonant frequencies of the two resonances are 1.785 GHz and 2.215 GHz, respectively. The resonance with a resonant frequency of 1.785 GHz is the dominant resonance. Furthermore, from... Figure 29 It can also be seen that when the antenna system operates at the resonant frequency of the main resonance (1.785 GHz), the isolation between the antennas is better than when it operates at another resonant frequency (2.215 GHz). When both switching circuits SW1 and SW2 are in the second connection state, the resonant frequencies of the two resonators are 1.875 GHz and 2.05 GHz, respectively. Among them, the resonant frequency of 1.875 GHz is the main resonance, and from... Figure 29 It can be seen that when the antenna system operates at the resonant frequency of the main resonance (1.875 GHz), the isolation between the antennas is better than that when it operates at another resonant frequency (2.05 GHz).

[0257] from Figure 29 It can also be seen that when both switching circuits SW1 and SW2 are in the first connection state, the S11 value of the antenna system in this embodiment is less than -6dB in the range of 1.85GHz to 1.91GHz. When both switching circuits SW1 and SW2 are in the second connection state, the S11 value of the antenna system in this embodiment is less than -6dB in the ranges of 1.82GHz to 1.95GHz and 2GHz to 2.08GHz.

[0258] It should be noted that in engineering, an S11 value of -6dB is generally used as the standard. When the S11 value of an antenna is less than -6dB, the antenna can be considered to be working normally, or the antenna can be considered to have good transmission efficiency.

[0259] Figure 30 In the diagram, curve A1 represents this application. Figure 1 The system efficiency of each antenna in the antenna system shown is represented by curve A2, which represents the efficiency of this application. Figure 1 The radiation efficiency of each antenna in the antenna system shown is from Figure 30 As can be seen, in the range of 1.85GHz to 2GHz, when both switching circuits SW1 and SW2 are in the first connection state, the system efficiency of each antenna in this embodiment is approximately -4.5dB to -5dB, and the radiation efficiency is approximately -3.4dB to -2.7dB. When both switching circuits SW1 and SW2 are in the second connection state, the system efficiency of each antenna in this embodiment is approximately -3dB to -3.2dB, and the radiation efficiency is approximately -2dB to -2.6dB.

[0260] Figure 1 The system efficiency of each antenna in the antenna system shown is approximately -7dB to -5.2dB, and the radiation efficiency is approximately -4.9dB to -4dB.

[0261] It can be seen that, in the range of 1.85GHz to 2GHz, the antenna efficiency of the antenna system provided in this embodiment is better than that of the antenna system shown in Figure 1 of this application. Furthermore, in this embodiment, the antenna efficiency when both switching circuits SW1 and SW2 are in the second connection state is better than that when they are in the first connection state.

[0262] Please see Figure 31 , Figure 31 This is a three-dimensional structural diagram of the antenna system in this embodiment. This embodiment is similar to... Figure 28a The antenna systems shown are basically the same in structure, except that:

[0263] Both radiating branches 111 and 112 extend in a direction parallel to the first radiator 11, and both radiating branches 111 and 112 are located on the same side as the first radiator 11. Furthermore, no switching circuit is provided between the first radiator 11 and the PCB board.

[0264] Of course, those skilled in the art will understand that in other alternative embodiments, a switching circuit may also be provided between the first radiator 11 and the PCB board.

[0265] In other embodiments, one of the radial branches 111 and 112 is L-shaped, and the other extends in a direction parallel to the first radiator 11. The L-shaped radial branch has its horizontal portion on the same side as the first radiator 12, and its vertical portion on the side adjacent to the first radiator. The other radial branch is on the same side as the first radiator 12. It should be understood that... Figure 31 The proposed solution can be combined with the solutions of the above embodiments.

[0266] This application also provides an electronic device including the antenna system 1 described in any of the above embodiments.

[0267] The antenna system of this embodiment was simulated and analyzed using simulation software, and the results were as follows: Figure 32 and Figure 33 The effect curve shown is shown.

[0268] Get Figure 32 and Figure 33 The simulation effect parameters of the curves shown are shown in Table 12 below (please refer to the table for details). Figure 31 (Understanding), wherein the length and width of the closed slot, the length and width of the non-closed slot, and the parameters of the gap and capacitance in the antenna system are all consistent with those in this application. Figure 1 The antenna systems shown have the same structure, so please refer to Table 1 above for specific values.

[0269] Table 12

[0270] parameter numerical values 18mm seam lengths L4 and L5 (mm) L4 = L5 = 17 Width of 18mm (mm) 1

[0271] Please see Figure 32 and Figure 33 , Figure 32 The S-parameter effect curves are obtained from the simulation effect test of the antenna system of the embodiment of this application. Figure 33 For the purposes of this application Figure 1 The antenna system structure shown is compared with the antenna system of this embodiment through simulation test results, and the antenna efficiency comparison curves are obtained.

[0272] from Figure 32 As can be seen from the above, the antenna system provided in this embodiment can generate two resonances (i.e., dual resonances) in each antenna. The resonant frequencies of the two resonances are 1.75 GHz and 2.415 GHz, respectively. Among them, the resonance with the resonant frequency of 1.75 GHz is the dominant resonance. Furthermore, from... Figure 32 It can also be seen that when the antenna system operates at the resonant frequency of the main resonance (1.75 GHz), the isolation between the antennas is better than that when operating at another resonant frequency (2.415 GHz). In the range of 1.85 GHz to 1.91 GHz, the S11 value of the antenna system in this embodiment is approximately less than -6 dB.

[0273] Figure 33 In the diagram, curve A1 represents this application. Figure 1 The system efficiency of the antenna system shown in Figure 1 is illustrated, and curve A2 represents the radiation efficiency of the antenna system shown in Figure 1 of this application. Figure 33As can be seen, in the 1.8GHz to 1.9GHz range, the antenna efficiency of the antenna system in this embodiment is approximately -8.8dB to -5dB, and the radiation efficiency is approximately -4.6dB to -3.8dB. Furthermore, in the 1.8GHz to 1.9GHz range, both the radiation efficiency and antenna efficiency of the antenna system provided in this embodiment are superior to those of the present application. Figure 1 The antenna system shown.

[0274] Please see Figure 34 , Figure 34 This is a schematic diagram of the antenna structure according to an embodiment of this application. The structure of this embodiment is basically the same as the antenna system shown in Figure 1 of this application, except that:

[0275] The second radiator 12 and the third radiator 13 are each connected to the same radio frequency (RF) source via a duplexer 23. The second radiator 12 receives a first radio frequency (RF) signal output from the RF source via the duplexer 23, and the third radiator 13 receives a second RF signal output from the RF source via the duplexer 23. In alternative embodiments, the duplexer 23 may also be a combiner, which does not limit the scope of protection of this application. It should be understood that... Figure 34 The proposed solution can be combined with the solutions of the above embodiments.

[0276] This application also provides an electronic device including the antenna system described in any of the above embodiments.

[0277] The antenna system of this embodiment was simulated and analyzed using simulation software, and the results were as follows: Figure 35 and Figure 36 The effect curve shown is shown.

[0278] Get Figure 35 and Figure 36 Please refer to Table 1 above for the simulation effect parameters of the curves shown. Figure 34 understand).

[0279] Please see Figure 35 , Figure 35 The above is a simulation curve of the S-parameter effect obtained from the simulation of the antenna system in this embodiment. Figure 36 The image shows the antenna efficiency curve obtained from a simulation of the antenna in this embodiment. (From...) Figure 35As can be seen, when the second radiator is excited by the RF source, the antenna of this embodiment can generate a resonance at a frequency of 1.8 GHz. At this frequency, the antenna's S21 value is -29 dB. When the third radiator is excited by the RF source, the antenna of this embodiment can generate a resonance at 1.845 GHz. At this frequency, the antenna's S21 value is -35 dB. Therefore, the antenna of this embodiment can generate two resonances (i.e., dual resonance) while maintaining high isolation. Furthermore, from... Figure 35 It can also be seen that in the ranges of 1.785GHz to 1.825GHz and 1.85GHz to 1.925GHz, the S11 value of the antenna in this embodiment is less than -6dB.

[0280] from Figure 36 It can be seen that in the 1.75GHz to 1.85GHz range, when the second radiator is excited by the RF source, the system efficiency of the antenna in this embodiment is approximately -6.2dB to -5.5dB, and the radiation efficiency is approximately -4.9dB to -4.5dB. In the 1.8GHz to 1.95GHz range, when the third radiator is excited by the RF source, the system efficiency of the antenna in this embodiment is approximately -9.5dB to -5dB, and the radiation efficiency is approximately -4.9dB to -4dB. Furthermore, it can be seen that in the 1.79GHz to 1.825GHz and 1.85GHz to 1.9GHz ranges, the system efficiency of the antenna in this embodiment is greater than -6dB. Therefore, the antenna provided in this embodiment can achieve a good antenna efficiency bandwidth.

[0281] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. An antenna system comprising a first antenna, a second antenna, and a ground plane, characterized in that, The first antenna includes a first radiator and a second radiator, and the second antenna includes the first radiator and a third radiator; The two ends of the first radiator are electrically connected to the floor; The first end of the second radiator is relatively far away from the first end of the third radiator, and is respectively connected to or coupled to the first radiator. The second end of the second radiator is disposed opposite to the second end of the third radiator, and forms a gap. The second radiator includes a first feed connection point, through which the antenna system feeds the first antenna; the third radiator includes a second feed connection point, through which the antenna system feeds the second antenna.

2. The antenna system as described in claim 1, characterized in that, The antenna system further includes an adjustment device, one end of which is connected to the first radiator and the other end of which is connected to the floor; The regulating device is a capacitor and / or an inductor.

3. The antenna system as described in claim 2, characterized in that, The first radiator, the second radiator, the third radiator, and the gap form a non-closed slot. Along the length of the non-closed slot, the connection point formed by the adjustment device and the first radiator is located between the first feed connection point and the second feed connection point.

4. The antenna system as described in any one of claims 1 to 3, characterized in that, A capacitor is provided at the gap, and the two ends of the capacitor are respectively connected to the second end of the second radiator and the second end of the third radiator.

5. The antenna system as described in any one of claims 1 to 4, characterized in that, Both the second radiator and the third radiator are L-shaped.

6. The antenna system as described in any one of claims 1 to 5, characterized in that, The second radiator has one or more first slits; and / or One or more second slits are provided on the third radiator.

7. The antenna system as described in claim 6, characterized in that, A capacitor is provided at at least one of the first gap and the second gap.

8. The antenna system as described in any one of claims 1 to 7, characterized in that, The first radiator and the floor enclose a closed groove, the length of which is greater than or equal to half the wavelength of the first antenna or the second antenna and less than one wavelength of the first antenna or the second antenna.

9. An electronic device, characterized in that, The antenna system includes any one of claims 1 to 8.

10. The electronic device as claimed in claim 9, characterized in that: The first radiator is formed by the metal frame of the electronic device or an embedded metal structural component within the metal frame; and Both the second radiator and the third radiator are formed from the metal structural components of the electronic device, or are formed on the bracket of the electronic device by laser direct forming process.

11. The electronic device as claimed in claim 9, characterized in that, The first radiator is formed by the metal frame of the electronic device, and the second and third radiators are both formed by embedded metal structural components embedded in the metal frame of the electronic device.

12. The electronic device as claimed in claim 9, characterized in that, The first radiator is formed from the metal battery cover of the electronic device or the metal frame of the electronic device; and The second radiator and the third radiator are both formed from the metal frame of the electronic device, or both are formed from embedded metal structural components embedded in the metal frame, or both are formed on the bracket of the electronic device by laser direct forming process.

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