WO2024067012A1 - Antenne et dispositif électronique - Google Patents

Antenne et dispositif électronique Download PDF

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Publication number
WO2024067012A1
WO2024067012A1 PCT/CN2023/117544 CN2023117544W WO2024067012A1 WO 2024067012 A1 WO2024067012 A1 WO 2024067012A1 CN 2023117544 W CN2023117544 W CN 2023117544W WO 2024067012 A1 WO2024067012 A1 WO 2024067012A1
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WO
WIPO (PCT)
Prior art keywords
radiator
antenna
electronic device
floor
parasitic
Prior art date
Application number
PCT/CN2023/117544
Other languages
English (en)
Chinese (zh)
Inventor
王超
孙利滨
徐慧梁
王汉阳
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2024067012A1 publication Critical patent/WO2024067012A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/04—Multimode antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation

Definitions

  • the present application relates to the field of antennas, and in particular to an antenna and an electronic device.
  • a parasitic metal can be set on the side of the antenna radiator away from the floor, and the parasitic metal and the antenna radiator can be used to generate current in the same direction and radiate simultaneously, thereby improving the efficiency and bandwidth of the antenna.
  • the antenna efficiency will drop significantly.
  • the OTA (Over The Air) performance of terminal product antennas in free space is good, but in actual human use, the antenna radiation efficiency is reduced, affecting the communication quality and resulting in a poor user experience.
  • the antenna in the prior art has the problem that its efficiency is significantly reduced when it is close to the human body.
  • the embodiments of the present application provide an antenna and an electronic device, which solve the problem in the prior art that the efficiency of the antenna is significantly reduced when it is close to the human body.
  • the present application provides an antenna, comprising a radiator, wherein a first end of the radiator is connected to a feeding point, and a second end of the radiator is grounded.
  • the radiator is arranged relative to a floor and spaced apart, and is located entirely on a first side of the floor.
  • the first parasitic radiator is arranged relative to the floor with a spacing therefrom and is entirely located on the second side of the floor, and the second side of the floor is arranged opposite to the first side of the floor.
  • the projection plane is a plane parallel to the floor, and the projection of the radiator on the projection plane at least partially overlaps with the projection of the first parasitic radiator on the projection plane.
  • one end of the first parasitic radiator close to the first end of the radiator is grounded.
  • the antenna of the present application is located on the first side of the floor, and the first end of the radiator is fed and the second end is grounded (or can be understood as a PIFA antenna structure, Planar Inverted F-shaped Antenna, planar inverted F antenna structure).
  • a first parasitic radiator is arranged on the second side of the floor, and the grounding position of the first parasitic radiator is close to the grounding position of the radiator.
  • the present application can use the first parasitic radiator to change the direction of the electric field generated when the antenna radiates outward, which helps to reduce or avoid the tangential electric field generated between the human body and the antenna when the antenna is close to the human body, thereby reducing the absorption of the antenna radiation energy by the human body when the antenna is close to the human body, thereby laying a foundation for improving the efficiency of the antenna when it is close to the human body.
  • the direction of the electric field formed on the first parasitic radiator is perpendicular to the plane where the first parasitic radiator is located.
  • the antenna implemented in the present application can use the first parasitic radiator to form an electric field on the first parasitic radiator that is perpendicular to the plane where the first parasitic radiator is located, or it can be understood that when the antenna in the embodiment of the present application is excited, the direction of the electric field generated on the first parasitic radiator is the normal direction of the first parasitic radiator. Therefore, the embodiment of the present application provides a possibility: when the antenna is close to the human body, the first parasitic radiator is used as the part of the antenna closest to the human body and the first parasitic radiator is parallel or almost parallel to the human body.
  • the direction of the electric field between the first parasitic radiator and the human body is the normal direction of the first parasitic radiator, the direction of the electric field between the antenna and the human body can be mostly or even completely perpendicular to the human body, and the electric field perpendicular to the human body is difficult to enter the human body (or it can be understood that the radiation energy of the antenna is difficult to be absorbed by the human body at this time), thereby reducing the absorption of the antenna radiation energy by the human body and improving the efficiency of the antenna when it is close to the human body.
  • the embodiment of the present application provides a new idea for solving the problem of significantly reduced efficiency of the antenna when it is close to the human body.
  • the first parasitic radiator is used to change the direction of the electric field between the antenna and the human body, thereby improving the efficiency of the antenna when it is close to the human body. This lays a foundation for improving the communication quality and signal transmission quality of electronic devices when the antenna is used in electronic devices, especially wearable electronic devices.
  • the entire area of the projection of the radiator on the projection plane is located within the projection of the first parasitic radiator on the projection plane.
  • a length of the first parasitic radiator is greater than or equal to a length of the radiator.
  • a plane parallel to the floor is taken as a projection plane, and a projection of the floor on the projection plane at least partially overlaps with a projection of the first parasitic radiator on the projection plane.
  • the width of the first parasitic radiator is greater than or equal to the width of the floor.
  • a plane parallel to the floor is used as the projection plane, and all projections of the floor on the projection plane are located within the projection of the first parasitic radiator on the projection plane.
  • the antenna of the embodiment of the present application by increasing the width or length of the first parasitic radiator, can provide the possibility for the electric field direction in more areas between the antenna and the human body to be perpendicular to the human body, which helps to further improve the efficiency of the antenna when it is close to the human body.
  • a height h1 of the first parasitic radiator from the floor satisfies: 1 mm ⁇ h1 ⁇ 1.5 mm.
  • a height h0 of the radiator from the floor satisfies: 1.5 mm ⁇ h0 ⁇ 3 mm.
  • the antenna further includes a second parasitic radiator, which is spaced relative to the radiator and is entirely located on a side of the radiator away from the floor, and one end of the second parasitic radiator close to the first end of the radiator is grounded.
  • the antenna of the embodiment of the present application by arranging a second parasitic radiator on the side of the radiator away from the floor, can generate currents in different directions on the second parasitic radiator when the antenna operates in different frequency bands, such as currents in the same direction as the current on the radiator or currents in the opposite direction to the current on the radiator, thereby enabling the antenna to have multiple operating modes, thereby expanding the efficiency bandwidth of the antenna.
  • a height h2 of the second parasitic radiator from the radiator satisfies: 1 mm ⁇ h2 ⁇ 1.5 mm.
  • the present application also provides an electronic device, including the antennas involved in the above-mentioned embodiments and possible embodiments.
  • the electronic device of the embodiment of the present application can use the first parasitic radiator in the antenna to change the direction of the electric field generated when the antenna radiates outward, which helps to reduce or avoid the generation of a tangential electric field between the human body and the antenna when the electronic device is close to the human body, thereby reducing the human body's absorption of the antenna radiation energy when the electronic device is close to the human body, thereby improving the efficiency of the antenna when it is close to the human body, and helping to improve the communication quality, signal transmission quality, etc. of the electronic device when in use.
  • the radiator includes a conductive member disposed within a housing of the electronic device.
  • the first parasitic radiator includes a conductive member disposed in the housing of the electronic device and/or a conductive layer disposed on the inner surface of the housing of the electronic device.
  • the second parasitic radiator of the antenna includes a conductive member disposed in the housing of the electronic device and/or a conductive layer disposed on the inner surface of the housing of the electronic device.
  • the electronic device is an earphone, which includes an ear cap and an ear stem, one end of the ear stem is connected to the ear cap, and the radiator is disposed in the ear stem.
  • the ear stem includes a first side shell facing the ear cap, and a second side shell facing away from the ear cap, wherein the first parasitic radiator is formed by at least a portion of the first side shell; or:
  • the first parasitic radiator is formed by a conductive member between the first side housing and the floor; or:
  • the first parasitic radiator is formed by a conductive layer disposed on the inner surface of the first side housing.
  • the ear stem includes a first side shell facing the ear cap and a second side shell facing away from the ear cap, wherein:
  • a second parasitic radiator of the antenna is formed by at least part of the second side housing;
  • the second parasitic radiator of the antenna is formed by a conductive member between the second side housing and the floor; or
  • the second parasitic radiator of the antenna is formed by a conductive layer arranged on the inner surface of the second side shell.
  • the first parasitic radiator is parallel to an end surface of the ear cap away from the ear stem.
  • the ear cap is provided with an earplug that matches the ear canal of the user, and the first parasitic radiator is located on a side of the floor close to the earplug and parallel to an end surface of the earplug away from the ear stem.
  • the earplug when the earphone is worn, the earplug is placed in the ear canal of the human body. Since the first parasitic radiator is located on the side of the floor close to the earplug, the first parasitic radiator can be understood as the part of the antenna closest to the human body.
  • the embodiment of the present application can utilize the first parasitic radiator to make the direction of the electric field between the antenna and the human body the normal of the first parasitic radiator, thereby making the direction of the electric field between the antenna and the human body mostly or even completely perpendicular to the human body, and the electric field perpendicular to the human body is difficult to enter the human body (or it can be understood that the radiation energy of the antenna is difficult to be absorbed by the human body at this time), thereby reducing the human body's absorption of the antenna radiation energy, improving the efficiency of the antenna when the earphone is worn, and thereby effectively improving the communication quality and signal transmission quality of the earphone.
  • FIG1 is a schematic diagram of a three-dimensional structure of an antenna according to an embodiment of the present application, wherein the antenna includes a first parasitic radiator;
  • FIG2 is a schematic diagram of electric field distribution between an antenna and a human body according to an embodiment of the present application
  • FIG3 is a second schematic diagram of the three-dimensional structure of the antenna according to an embodiment of the present application, wherein the antenna includes a first parasitic radiator and a second parasitic radiator;
  • 4a and 4b are schematic diagrams of the direction of current generated on the radiator and the second parasitic radiator when the antenna according to the embodiment of the present application is working;
  • FIG5a is a schematic diagram of a partial three-dimensional structure of an electronic device at one viewing angle according to an embodiment of the present application, wherein the electronic device is a headset, and the antenna includes a first parasitic radiator;
  • FIG5 b is a schematic diagram of a partial three-dimensional structure of an electronic device from another perspective according to an embodiment of the present application, wherein the electronic device is a headset, and the antenna includes a first parasitic radiator;
  • FIG6 is a schematic diagram of a simulation model structure of an electronic device in a head model scenario according to an embodiment of the present application; wherein the antenna includes a first parasitic radiator;
  • FIG7 is a local electric field distribution diagram obtained by analyzing the simulation effect of an electronic device of a reference design in a head model scenario
  • FIG8 is a local electric field distribution diagram obtained by analyzing the simulation effect of the electronic device according to the embodiment of the present application in a head model scenario
  • FIG9 is a graph showing antenna system efficiency and antenna radiation efficiency obtained by analyzing the simulation effect of a reference electronic device in a head model scenario
  • FIG10 is a curve diagram of antenna system efficiency and antenna radiation efficiency obtained by analyzing the simulation effect of the electronic device according to the embodiment of the present application in a head model scenario;
  • FIG11a is a schematic diagram of a partial three-dimensional structure of an electronic device according to an embodiment of the present application at one viewing angle, wherein the antenna includes a first parasitic radiator and a second parasitic radiator;
  • FIG11 b is a schematic diagram of a partial three-dimensional structure of an electronic device according to an embodiment of the present application from another perspective, wherein the antenna includes a first parasitic radiator and a second parasitic radiator;
  • FIG12 is a schematic diagram of a simulation model structure of an electronic device in a head model scenario according to an embodiment of the present application, wherein the antenna includes a first parasitic radiator and a second parasitic radiator;
  • FIG13 is a partial enlarged structural diagram of the electronic device in FIG12;
  • FIG14 is a curve diagram of antenna system efficiency and antenna radiation efficiency obtained by performing simulation analysis of the electronic device in a head model scenario according to an embodiment of the present application;
  • FIG15 is a schematic diagram of a partial three-dimensional structure of an electronic device according to an embodiment of the present application.
  • FIG16 is a schematic diagram of the structure of an electronic device according to an embodiment of the present application, wherein the electronic device is a headset.
  • the terms “installed”, “connected”, and “connected” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components.
  • installed should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components.
  • Coupling can be understood as direct coupling and/or indirect coupling, and "coupled connection” can be understood as direct coupling connection and/or indirect coupling connection.
  • Direct coupling can also be called “electrical connection”, which is understood as the physical contact and electrical conduction between components; it can also be understood as the connection between different components in the circuit structure through physical lines such as printed circuit board (PCB) copper foil or wires that can transmit electrical signals; "indirect coupling” can be understood as two conductors being electrically conductive in an airless/non-contact manner.
  • indirect coupling can also be called capacitive coupling, for example, signal transmission is achieved by coupling between the gaps between two conductive parts to form an equivalent capacitor.
  • the "end" in the first end/second end/feeding end/grounding end of the antenna radiator cannot be narrowly understood as a point, but can also be considered as a section of the radiator including the end point on the antenna radiator; nor can it be narrowly understood as an end point or end that is disconnected from other radiators, but can also be considered as a point or a section on a continuous radiator.
  • the "end” may include the end point of the antenna radiator at a certain gap.
  • the end of the antenna radiator can be considered as a section of the radiator within 5 mm (for example, 2 mm) from a certain gap on the radiator.
  • the "end” may include a connection point on the antenna radiator that is connected to other conductive structures.
  • the feeding end may be a connection point on the antenna radiator that is coupled to the feeding structure.
  • the grounding end may be a connection point on the antenna radiator that is coupled to the grounding structure.
  • Open end, closed end In some embodiments, the open end/closed end is, for example, relative to whether it is grounded. The closed end is grounded, and the open end is not grounded. In some embodiments, the open end/closed end is, for example, relative to other conductors. The closed end is electrically connected to other conductors, and the open end is not electrically connected to other conductors. In one embodiment, the open end can also be called an open end or an open circuit end. In one embodiment, the closed end can also be called a grounded end or a short circuit end.
  • Relative arrangement can be understood as face-to-face arrangement or arrangement with at least a partial overlap in a certain direction.
  • two relatively arranged radiators are arranged adjacently and no other radiator is arranged between them.
  • Ground/floor It can refer to at least a part of any grounding layer, grounding plate, or grounding metal layer in an electronic device (such as a mobile phone), or at least a part of any combination of any of the above grounding layers, grounding plates, or grounding components, etc.
  • Ground/floor can be used for grounding components in electronic devices.
  • "ground/floor” may include any one or more of the following: a grounding layer of a circuit board of an electronic device, a grounding plate formed by a middle frame of an electronic device, a grounding metal layer formed by a metal film under a screen, a conductive grounding layer of a battery, and a conductive part or metal part electrically connected to the above grounding layer/grounding plate/metal layer.
  • the circuit board may include a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12 to 14-layer board having 8, 10, 12, 13, or 14 layers of conductive material, or an element separated and electrically insulated by a dielectric layer or insulating layer such as glass fiber, polymer, etc.
  • PCB board includes a dielectric substrate, a grounding layer, and a wiring layer, and the wiring layer and the grounding layer are electrically connected through vias.
  • the dielectric substrate in the PCB board can be a flame retardant material (FR-4) dielectric board, a Rogers dielectric board, or a mixed dielectric board of Rogers and FR-4.
  • FR-4 flame retardant material
  • components such as a display, a touch screen, an input button, a transmitter, a processor, a memory, a battery, a charging circuit, a system on chip (SoC) structure, etc. can be mounted on the circuit board or connected to the circuit board; or electrically connected to the wiring layer and/or the ground layer in the circuit board.
  • the RF source is set in the wiring layer.
  • grounding layers, grounding plates, or grounding metal layers are made of conductive materials.
  • the conductive material can be any of the following materials: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil and tin-plated copper on an insulating substrate, cloth impregnated with graphite powder, graphite-coated substrates, copper-plated substrates, brass-plated substrates, and aluminum-plated substrates.
  • the grounding layer/grounding plate/grounding metal layer can also be made of other conductive materials.
  • Electrical length can be defined as the physical length (i.e. mechanical length or geometric length) multiplied by the transmission length of an electrical or electromagnetic signal in a medium.
  • the electrical length is expressed as the ratio of the time it takes for the signal to travel the same distance as the physical length of the medium in free space.
  • the electrical length satisfies the following formula:
  • L is the physical length
  • a is the transmission time of the electrical or electromagnetic signal in the medium
  • b is the transmission time in free space.
  • electrical length can also refer to the ratio of physical length (i.e. mechanical length or geometric length) to the wavelength of the transmitted electromagnetic wave.
  • the electrical length can satisfy the following formula:
  • L is the physical length
  • ⁇ is the vacuum wavelength of the electromagnetic wave (or the medium wavelength of the electromagnetic wave).
  • the wavelength in a certain wavelength mode (such as a half wavelength mode, etc.) of the antenna may refer to the wavelength of the signal radiated by the antenna.
  • the wavelength of the radiated signal in the medium can be calculated as follows: Wherein, ⁇ is the relative dielectric constant of the medium, and frequency is the frequency of the radiation signal.
  • the gaps and grooves in the above embodiments may be filled with insulating medium.
  • the limitations such as parallel, perpendicular, identical (for example, identical length, identical width, etc.) mentioned in the embodiments of the present application are all for the current technological level, rather than being absolutely strict definitions in a mathematical sense.
  • the predetermined angle is 10°, and the deviation may be within a range of ⁇ 5°, for example.
  • the technical solution provided in this application is applicable to electronic devices with one or more of the following communication technologies: Bluetooth (BT) communication technology, global positioning system (GPS) communication technology, wireless fidelity (WiFi) communication technology, global system for mobile communications (GSM) technology, wideband code division multiple access (WCDMA) communication technology, long term evolution (LTE) communication technology, 5G communication technology, SUB-6G communication technology and other future communication technologies.
  • the electronic device in the embodiment of this application can be a Bluetooth headset, a mobile phone, a tablet computer, a smart bracelet, a smart watch, a smart helmet, smart glasses, wireless wearables, etc.
  • the Bluetooth headset can be, for example, a True Wireless Stereo (TWS) Bluetooth headset, etc.
  • the electronic device may also be a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, an electronic device in a 5G network or an electronic device in a future-evolved public land mobile network (PLMN), a wireless router or customer premises equipment (CPE), etc., but the embodiments of the present application are not limited to this.
  • PLMN public land mobile network
  • CPE customer premises equipment
  • FIG. 1 is a schematic diagram of a three-dimensional structure of an antenna according to an embodiment of the present application.
  • the present application provides an antenna 1.
  • the antenna 1 includes a radiator 10.
  • a first end 101 of the radiator 10 is connected to a feeding point (not shown in the figure), and a second end 102 of the radiator 10 is connected to a floor 20 for grounding.
  • the radiator 10 is arranged relative to the floor 20 and is located on a first side M of the floor 20 as a whole.
  • the first end 101 and the second end 102 of the radiator 10 are two ends along the extension direction of the radiator (or can be understood as being parallel to the length direction L of the antenna).
  • the antenna 1 further includes a first parasitic radiator 11, which is arranged relative to the floor 20 and spaced apart, and is entirely located on the second side N of the floor 20.
  • the second side N of the floor 20 is arranged opposite to the first side M of the floor 20, and the first side M and the second side N of the floor can be understood as two sides of the floor 20 along the thickness direction thereof.
  • the structure in which one end of the radiator 10 is fed and the other end is grounded can also be understood as a PIFA (Planar Inverted F-shaped Antenna) antenna structure.
  • the first end 101 of the radiator 10 is provided with a feeding connection point A0 for connecting a feeding point (not shown in the figure), and the second end 102 of the radiator 10 is provided with a grounding connection point B0 for grounding, wherein the feeding connection point A0 can be provided at the end of the first end 101 of the radiator 10, or at a certain distance from the end of the first end 101 of the radiator 10, and the distance can be, for example, 1/8 of the physical length of the radiator 10.
  • the grounding connection point B0 can be provided at the end of the second end 102 of the radiator 10, or at a certain distance from the end of the second end 102 of the radiator 10, and the distance can be, for example, 1/8 of the physical length of the radiator 10.
  • the first end 101 and the second end 102 of the radiator 10 mentioned above are not limited to the ends, and can also be a partial radiator segment including the ends.
  • the feeding point can be understood as a signal output end of the RF source, for example, it can be an output pin of a RF chip, or it can be one end of a signal transmission line used to connect to the RF source. As long as it can be electrically connected to the RF source through the feeding point and receive the RF signal, it does not deviate from the scope of this embodiment.
  • the "end” in this embodiment is described as an endpoint on the radiator or a section of the radiator including an endpoint.
  • the "end” may also include a connection point on the antenna radiator connected to other conductive structures, such as a closed end.
  • the closed end can be understood as a grounded connection point on the radiator.
  • the closed end can be understood as a connection point on the radiator that is connected to other conductors, such as an open end.
  • the open end can be understood as a connection point on the radiator that is not grounded.
  • the open end can be understood as a connection point that is not connected to other conductors.
  • the projection of the radiator 10 on the projection plane S at least partially overlaps with the projection of the first parasitic radiator 11 on the projection plane S.
  • one end of the first parasitic radiator 11 close to the first end 101 of the radiator 10 is connected to the floor 20 for grounding.
  • the first parasitic radiator 11 is provided with a grounding connection point B1 for grounding.
  • One end of the first parasitic radiator 11 close to the first end 101 of the radiator 10 is connected to the floor 20, which can be understood as: the grounding connection point B1 of the first parasitic radiator 11 is close to the grounding connection point B0 of the radiator 10.
  • the grounding connection point B0 and the grounding connection point B1 are aligned along the antenna width direction W. In other embodiments, the grounding connection point B0 and the grounding connection point B1 are staggered at a certain distance along the antenna width direction W. The distance can be, for example, less than or equal to 1/8 of the physical length of the radiator 10.
  • the grounding connection point B0 and the grounding connection point B1 can be correspondingly arranged along the antenna height direction H, or it can be understood that the projections of the grounding connection point B0 and the grounding connection point B1 on the projection plane S are overlapped.
  • the fact that the projection of the radiator 10 on the projection plane S at least partially overlaps with the projection of the first parasitic radiator 11 on the projection plane S can be understood as: at least a partial area of the first parasitic radiator 11 is located directly below the radiator 10 .
  • the antenna structure of the present application may be understood as follows: the radiator 10, the floor 20 and the first parasitic radiator 11 are arranged in sequence at intervals in the height direction H of the antenna, and along the width direction W or the length direction L of the antenna, the three may be arranged in a staggered manner or in an overlapping manner, and the present application does not limit this.
  • the first parasitic radiator 11 is arranged on a side of the floor 20 away from the radiator 10 and the ground connection point B1 of the first parasitic radiator 11 is close to the ground connection point B0 of the radiator 10, it does not depart from the scope of the embodiments of the present application.
  • the present application can use the first parasitic radiator 11 to change the direction of the electric field generated when the antenna 1 radiates outward, so the first parasitic radiator 11 can be understood as a polarizer of the antenna 1.
  • the first parasitic radiator 11 helps to reduce or avoid the tangential electric field generated between the human body and the antenna 1 when the antenna 1 is close to the human body, thereby reducing the human body's absorption of the antenna radiation energy when the antenna 1 is close to the human body, thereby laying a foundation for improving the efficiency of the antenna 1 when it is close to the human body.
  • Figure 2 is a schematic diagram of the electric field distribution between the antenna and the human body in an embodiment of the present application.
  • the direction E of the electric field formed on the first parasitic radiator 11 is perpendicular to the plane where the first parasitic radiator 11 is located.
  • the direction E of the electric field is perpendicular to the human body.
  • the antenna when the antenna is close to the human body, the electric field generated by its radiation will be absorbed by the human body to varying degrees, which will reduce the radiation capacity and efficiency of the antenna.
  • This application starts with the interaction between the electric field and the human body.
  • the human body absorbs the electric field generated by the antenna radiation with different strengths.
  • the tangential component of the electric field can directly enter the human body, while the normal component of the electric field is less or difficult to enter the human body.
  • the embodiment of the present application provides a new idea for solving the problem of significantly reduced efficiency of the antenna when it is close to the human body.
  • the first parasitic radiator 11 is used to change the direction of the electric field between the antenna and the human body, thereby improving the efficiency of the antenna when it is close to the human body. This lays a foundation for improving the communication quality and signal transmission quality of electronic devices when the antenna is used in electronic devices, especially wearable electronic devices.
  • the antenna 1 implemented in the present application can use the first parasitic radiator 11 to form an electric field on the first parasitic radiator 11 that is perpendicular to the plane where the first parasitic radiator 11 is located, or it can be understood that when the antenna in the embodiment of the present application is excited, the direction of the electric field generated on the first parasitic radiator 11 is the normal direction of the first parasitic radiator 11. Therefore, the embodiment of the present application provides a possibility: when the antenna 1 is close to the human body, the first parasitic radiator 11 is used as the part of the antenna closest to the human body and the first parasitic radiator is parallel or almost parallel to the human body.
  • the direction of the electric field between the first parasitic radiator 11 and the human body is the normal direction of the first parasitic radiator 11
  • the direction of the electric field between the antenna 1 and the human body can be mostly or even completely perpendicular to the human body, and the electric field perpendicular to the human body is difficult to enter the human body (or it can be understood that the radiation energy of the antenna is difficult to be absorbed by the human body at this time), thereby reducing the absorption of the antenna radiation energy by the human body and improving the efficiency of the antenna 1 when it is close to the human body.
  • the first The length of the parasitic radiator 11 is greater than or equal to the length of the radiator 10.
  • the extension direction of the radiator can also be understood as the length direction of the floor 20, or can be understood as the direction from the feeding connection point A0 on the radiator 10 to the grounding point B0.
  • the entire area of the projection of the radiator 10 on the projection plane S is located within the projection of the first parasitic radiator 11 on the projection plane S.
  • the radiator 10 is located directly above the first parasitic radiator 11 .
  • a plane parallel to the floor 20 is taken as the projection plane S, and the projection of the floor 20 on the projection plane S and the projection of the first parasitic radiator 11 on the projection plane S at least partially overlap, or it can be understood that at least a portion of the first parasitic radiator 11 is located directly below the floor 20.
  • the width of the first parasitic radiator 11 is greater than or equal to the width of the floor 20.
  • the width direction of the floor can be understood as a direction located in the same plane as the length direction of the floor 20 and perpendicular to the length direction of the floor 20, and the width of the first parasitic radiator 11 can be understood as an average width.
  • a plane parallel to the floor 20 is taken as a projection plane S, and the projection of the floor 20 on the projection plane S is entirely located within the projection of the first parasitic radiator 11 on the projection plane S, or it can be understood that the floor 20 is located directly above the first parasitic radiator 11 .
  • the antenna 1 of the embodiment of the present application by increasing the width or length of the first parasitic radiator 11, can provide the possibility for the electric field direction in more areas between the antenna and the human body to be perpendicular to the human body, which helps to further improve the efficiency of the antenna 1 when it is close to the human body.
  • the present application does not limit the height of the radiator 10 from the floor 20 and the height of the first parasitic radiator 11 from the floor 20. Please refer to Figure 1 for understanding.
  • the height of the radiator 10 from the floor 20 is h0. In one embodiment, 1.5 ⁇ h0 ⁇ 3, for example, it can be 1.5mm, 2mm, 3mm, etc. In other alternative embodiments, it can also be other sizes less than 1.5mm or greater than 3mm.
  • the height of the first parasitic radiator 11 from the floor 20 is h1. In one embodiment, 1 ⁇ h1 ⁇ 1.5, for example, it can be 1mm, 1.2mm, 1.5mm, etc. In other alternative embodiments, it can also be other sizes less than 1mm or greater than 1.5mm.
  • the height of the radiator from the floor can be understood as the minimum distance between any point of the radiator and any point of the floor.
  • the antenna efficiency bandwidth is significantly improved when the height h0 of the radiator 10 from the floor 20 is 3 mm compared to the antenna when the height h0 of the radiator 10 from the floor 20 is 1.5 mm.
  • the antenna 1 further includes a second parasitic radiator 12, which is arranged spaced apart from the radiator 10 and is located on the side of the radiator 10 away from the floor 20, and one end of the second parasitic radiator 12 close to the first end of the radiator 10 is connected to the floor to be grounded.
  • the one end of the second parasitic radiator 12 can be understood with reference to the description of the “end” above.
  • the length and width of the second parasitic radiator 12 are not limited. In one embodiment, the length of the second parasitic radiator 12 is the same as the length of the radiator 10, and the width of the second parasitic radiator 12 is the same as the width of the radiator 10, or it can be understood that: the projection of the second parasitic radiator 12 on the projection plane S completely overlaps with the projection of the radiator 10 on the projection plane S.
  • the projection of the second parasitic radiator 12 on the projection plane S may be entirely located within the projection of the radiator 10 on the projection plane S, or the projection of the radiator 10 on the projection plane S may be entirely located within the projection of the second parasitic radiator 12 on the projection plane S.
  • a ground connection point B2 is provided on the second parasitic radiator 12.
  • the ground connection point B2 is aligned with the ground connection point B1 and/or the ground connection point B0 along the antenna width direction W.
  • the ground connection point B2 is staggered with the ground connection point B1 and/or the ground connection point B0 along the antenna width direction W at a certain interval. The interval may be, for example, less than or equal to 1/8 of the physical length of the second parasitic radiator 12.
  • the ground connection point B2 and the ground connection point B0 and/or the ground connection point B1 may be arranged correspondingly along the antenna height direction H, or it may be understood that the projections of the ground connection point B2, the ground connection point B0, and the ground connection point B1 on the projection plane S are overlapped.
  • Figures 4a and 4b are schematic diagrams of the direction of current generated on the radiator and the second parasitic radiator when the antenna according to the embodiment of the present application is working.
  • the embodiment of the present application can generate a current in the same direction as that on the radiator 10 on the second parasitic radiator 12 when the antenna is excited in one working frequency band (for example, the working frequency band where 2.45 GHz is located), as shown in FIG. 4a, at this time, the antenna can be considered to be operating in a common mode mode, and in another working frequency band (for example, the working frequency band where 2.9 GHz is located), a current in the opposite direction to that on the radiator 10 is generated on the second parasitic radiator 12, as shown in FIG. 4b, at this time, the antenna can be considered to be operating in a differential mode.
  • the embodiment of the present application can utilize the second parasitic radiator 12 to enable the antenna to generate multiple working modes and operate in different working frequency bands, thereby This expands the bandwidth of the antenna.
  • the antenna 1 of the embodiment of the present application by setting the second parasitic radiator 12 on the side of the radiator 10 away from the floor 20, can generate currents in different directions on the second parasitic radiator 12 when the antenna 1 operates in different frequency bands, such as currents in the same direction as the current on the radiator 10 or currents in the opposite direction to the current on the radiator 10, thereby enabling the antenna 1 to have multiple operating modes, thereby expanding the efficiency bandwidth of the antenna 1.
  • the embodiment of the present application does not limit the height between the second parasitic radiator 12 and the floor 20.
  • the height between the second parasitic radiator 12 and the floor 20 is h2.
  • 1 ⁇ h2 ⁇ 1.5 for example, it can be 1mm, 1.2mm, 1.5mm, etc. In other alternative implementations, it can also be other sizes less than 1mm or greater than 1.5mm.
  • each radiator such as the radiator 10, the first parasitic radiator 11 and the second parasitic radiator 12
  • it can be formed by a conductive member in an electronic device, or it can be formed by a metal coating layer coated in the electronic device.
  • the electronic device has a shell, and each radiator can be formed by a metal coating layer coated on the inner wall of the shell.
  • Each radiator can be formed in the same formation method or in different formation methods.
  • Each radiator can be formed in one formation method or in multiple formation methods in the above examples.
  • the first parasitic radiator can be partially formed by a conductive member and partially formed by a metal coating layer.
  • each radiator e.g., radiator 10, first parasitic radiator 11, and second parasitic radiator 12
  • the grounding method of each radiator is not limited.
  • it can be grounded through a grounding member (e.g., grounding member 201, grounding member 202, and grounding member 203).
  • the grounding member can be, for example, a conductive member, a spring foot, etc. connected between the radiator and the floor.
  • the feeding connection point A0 of the radiator 10 can be directly connected to the feeding point, or it can be connected to the feeding point through a feeding member 204.
  • the feeding member 204 can be, for example, a conductive member connected between the radiator and the feeding point.
  • the floor 20 can be, for example, a PCB board. In other alternative embodiments, the floor 20 can also be a grounding layer in the PCB board.
  • the present application also provides an electronic device, comprising the antenna mentioned in the above embodiments.
  • the electronic device of the embodiment of the present application can use the first parasitic radiator in the antenna to change the direction of the electric field generated when the antenna radiates outward, which helps to reduce or avoid the generation of a tangential electric field between the human body and the antenna when the electronic device is close to the human body, thereby reducing the human body's absorption of the antenna radiation energy when the electronic device is close to the human body, thereby improving the efficiency of the antenna when it is close to the human body, and helping to improve the communication quality, signal transmission quality, etc. of the electronic device when in use.
  • the electronic device of the embodiment of the present application may be, for example, a smart watch or a smart bracelet.
  • the smart watch or smart bracelet has a back cover that fits against the arm when worn on the human body.
  • the first parasitic radiator of the antenna may be arranged on the side of the floor close to the back cover, and the first parasitic radiator is arranged parallel or almost parallel to the back cover, and then the first parasitic radiator can be used to change most or even all of the direction of the electric field between the antenna and the human body to a direction perpendicular to the human body.
  • the electric field perpendicular to the human body is difficult to enter the human body (or it can be understood that the radiation energy of the antenna is difficult to be absorbed by the human body at this time), thereby reducing the human body's absorption of the antenna radiation energy, and improving the communication quality and signal transmission quality of the electronic device (such as a smart bracelet or a smart watch) when it is worn.
  • the electronic device may be, for example, a VR glasses, which has a back cover that fits the face of a person when worn on a human body.
  • the first parasitic radiator of the antenna may be disposed on the side of the floor close to the back cover, and the first parasitic radiator is disposed parallel or almost parallel to the back cover.
  • the electronic device may also be, for example, a mobile phone, whose screen fits the face of a person when making a call. Therefore, when the antenna of the embodiment of the present application is applied to a mobile phone, the first parasitic radiator of the antenna may be disposed on the side of the floor close to the screen, and the first parasitic radiator is parallel or almost parallel to the screen.
  • the embodiments of the present application can be applied to a variety of electronic devices (especially wearable electronic devices).
  • the antenna of the embodiments of the present application is set in the electronic device in the following position: the first parasitic radiator is arranged on the floor close to the side of the electronic device close to the human body when in use and the electric field between the antenna and the human body can be made perpendicular or nearly perpendicular to the human body, it does not depart from the scope of the embodiments of the present application.
  • Figure 5a is a schematic diagram of a partial three-dimensional structure of an electronic device in one perspective of the present application embodiment
  • Figure 5b is a schematic diagram of a partial three-dimensional structure of an electronic device in another perspective of the present application embodiment.
  • the electronic device 2 shown in Figures 5a and 5b adopts the antenna structure shown in Figure 1, and the antenna includes a first parasitic radiator 11.
  • the earphone includes an ear cap 21 and an ear stem 24 , one end of the ear stem 24 is connected to the ear cap 21 , and the radiator 10 is disposed inside the ear stem 24 .
  • the earphone may be, for example, an in-ear earphone, and the ear cap 21 is provided with an earplug that matches the ear canal of the user.
  • the earplug 23 can be, for example, a rubber ring, a silicone ring, a foam ring, etc., which is sleeved on the ear cap 21.
  • the antenna 1 is arranged in the ear rod 24, and the first parasitic radiator 11 is located on the side of the floor 20 close to the earplug 23.
  • the earplug 23 when the in-ear earphone is worn on the human ear, the earplug 23 can be considered to be parallel to the human body, and thus, the first parasitic radiator 11 is parallel to the end surface 231 of the earplug 23 away from the ear rod 24 (or can be understood as the end surface of the earplug 23 facing the ear).
  • the earphone can be, for example, an earbud earphone.
  • the end surface 211 of the ear cap 21 can be considered to be parallel to the human body, and thus, the first parasitic radiator 11 is located on the side of the floor 20 close to the ear cap 21 and is parallel to the end surface 211 of the ear cap 21 away from the ear rod 24 (or can be understood as the end surface of the ear cap 21 facing the ear).
  • the ear stem 24 can be approximately considered to be parallel to the human body, and therefore, the first parasitic radiator 11 can also be arranged parallel to the side wall of the ear stem 24 .
  • the radiator 10 and the first parasitic radiator 11 are both formed by conductive components disposed in the electronic device 2 .
  • the simulation software was used to perform simulation analysis on a reference electronic device and an electronic device of the embodiment of the present application under a head model, and the simulation effect diagrams shown in Figures 7 to 10 were obtained.
  • a schematic diagram of the head model scene please refer to Figure 6, where the electronic device 2 is worn on a human ear.
  • the antenna used in a reference electronic device can be understood as a PIFA antenna structure, which is not provided with a first parasitic radiator.
  • Figure 7 is a local electric field distribution diagram obtained by simulating the effect of an electronic device of a reference design in a head model scenario
  • Figure 8 is a local electric field distribution diagram obtained by simulating the effect of an electronic device of an embodiment of the present application in a head model scenario.
  • the arrows indicate the direction of the electric field.
  • the electric field direction of the antenna (PIFA antenna structure) in the electronic device provided by the reference design below the floor 20A (or can be understood as between the electronic device and the human body) has a tangential component (as shown in the part circled by the dotted circle in Figure 7), and as can be seen from Figure 8, in the electronic device of the embodiment of the present application, the electric field direction of the antenna below the first parasitic radiator 11 (or can be understood as between the electronic device and the human body) is the normal direction of the first parasitic radiator 11, or can be understood as perpendicular to the human body.
  • FIG9 is a graph showing the antenna system efficiency and antenna radiation efficiency obtained by analyzing the simulation effect of an electronic device of a reference design in a head mold scenario.
  • FIG10 is a graph showing the antenna system efficiency and antenna radiation efficiency obtained by analyzing the simulation effect of an electronic device of an embodiment of the present application in a head mold scenario.
  • the horizontal axis represents frequency in GHz
  • the vertical axis represents the radiation efficiency and system efficiency of the antenna.
  • the radiation efficiency is a value that measures the radiation capability of the antenna. Metal loss and dielectric loss are both factors that affect the radiation efficiency.
  • the system efficiency is the actual efficiency after considering the matching of the antenna port. That is, the system efficiency of the antenna is the actual efficiency (that is, efficiency) of the antenna. Those skilled in the art will understand that efficiency is generally expressed in percentages, and there is a corresponding conversion relationship between it and dB. The closer the efficiency is to 0dB, the lower the efficiency is. The efficiency of the antenna is better.
  • the system efficiency of the antenna (PIFA antenna structure) in the reference design electronic device at the three frequencies of 2.4 GHz, 2.44 GHz and 2.48 GHz is approximately -8.3 dB
  • the system efficiency of the antenna in the electronic device in the embodiment of the present application at the three frequencies of 2.4 GHz, 2.44 GHz and 2.48 GHz is approximately -6.3 dB.
  • the system efficiency of the antenna in the electronic device in the embodiment of the present application is improved by approximately 2 dB.
  • the embodiment of the present application can change the direction of the electric field generated when the antenna radiates outward by setting the first parasitic radiator 11, which helps to reduce or avoid the tangential electric field generated between the human body and the antenna when the electronic device is close to the human body, thereby reducing the human body's absorption of the antenna radiation energy when the electronic device is close to the human body, thereby improving the efficiency of the antenna when it is close to the human body (that is, the system efficiency), and helping to improve the communication quality, signal transmission quality, etc. of the electronic device when it is in use.
  • Figure 11a is a schematic diagram of a partial three-dimensional structure of an electronic device according to an embodiment of the present application from one perspective
  • Figure 11b is a schematic diagram of a partial three-dimensional structure of an electronic device according to an embodiment of the present application from another perspective.
  • the structure of the electronic device shown in Figures 11a and 11b is basically the same as the structure of the electronic device shown in Figures 5a and 5b, except that the antenna adopts the antenna structure shown in Figure 3.
  • the antenna includes a first parasitic radiator 11 and a second parasitic radiator 12.
  • the simulation software was used to perform simulation analysis on the electronic device of the embodiment of the present application under the head model, and the simulation effect diagram shown in Figure 14 was obtained.
  • the head model scene is shown in Figures 12 and 13, and the electronic device 2 is worn on the human ear.
  • Figure 12 is a schematic diagram of the simulation model structure of the electronic device of the embodiment of the present application under the head model scene
  • Figure 13 is a schematic diagram of the partial enlarged structure of the electronic device part in Figure 12.
  • the simulation data for obtaining the simulation effect diagram shown in Figure 14 is shown in Table 2 below (please understand it in conjunction with Figure 11b).
  • FIG. 14 is a graph showing antenna system efficiency and antenna radiation efficiency obtained by performing simulation effect analysis on the electronic device in a head model scenario according to an embodiment of the present application.
  • the system efficiency of the embodiment of the present application in the Bluetooth frequency band is -5 dB, which is 3 dB higher than that of the antenna of the reference design.
  • the antenna in the electronic device of the embodiment of the present application can operate at multiple frequency points (e.g. Such as 2.4GHz, 2.44GHz, 2.7GHz, 2.9GHz) to produce multiple resonances, compared with the structure shown in Figure 5a and Figure 5b, the efficiency bandwidth of the antenna in the embodiment of the present application is significantly improved.
  • the efficiency bandwidth of the antenna can be expanded.
  • Figure 15 is a schematic diagram of a partial three-dimensional structure of an electronic device according to an embodiment of the present application
  • Figure 16 is a schematic diagram of the structure of an electronic device according to an embodiment of the present application.
  • the electronic devices shown in FIG. 15 and FIG. 16 are substantially the same as those shown in FIG. 11a and FIG. 11b, except that the first parasitic radiator 11 and the second parasitic radiator 12 are both formed by a conductive layer on the inner surface of the housing 22 of the electronic device 2, for example, by a metal coating layer attached to the inner surface of the housing 22 (as shown by the dotted line in FIG. 16 ).
  • the first parasitic radiator 11 and the second parasitic radiator 12 may also be directly formed by the housing 22 of the ear rod 24 itself.
  • the ear rod 24 includes a first parasitic radiator 11 and a second parasitic radiator 12 facing the ear cap 21.
  • the radiator 10 can also be formed by a metal coating layer coated on the inside of the electronic device 2, for example, it can be a metal coating layer coated on a bracket provided inside the electronic device 2, etc.
  • the shell 22 can be, for example, a plastic shell, and the metal coating layer can be sprayed on the inner surface or outer surface of the plastic shell through PDS (Printed Direct Structure) or LDS (Laser Direct Structure) technology.
  • PDS Print Direct Structure
  • LDS Laser Direct Structure
  • the electronic device 2 further includes a battery 25, which is disposed at the tail of the ear rod 24 and is used to power the electronic components in the earphone.
  • the antenna is located between the ear cap 21 and the battery 25.
  • the battery 25 may also be disposed at other locations, which is not limited in this application.

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Abstract

La présente invention concerne une antenne et un dispositif électronique. L'antenne comprend : un radiateur, une première extrémité du radiateur étant reliée à un point d'alimentation, et une seconde extrémité de celui-ci étant mise à la terre, le radiateur et un plan de masse étant disposés à distance l'un de l'autre, et le radiateur étant situé d'un seul tenant sur un premier côté du plan de masse ; et un premier radiateur parasite, le premier radiateur parasite et le plan de masse étant agencés à distance l'un de l'autre, et le premier radiateur parasite étant situé d'un seul tenant sur un second côté du plan de masse, le second côté du plan de masse étant configuré en regard du premier côté du plan de masse. L'extrémité du premier radiateur parasite proche de la première extrémité du radiateur est mise à la terre. La présente invention peut utiliser le premier radiateur parasite pour changer la direction d'un champ électrique généré lorsque l'antenne rayonne vers l'extérieur, ce qui aide à réduire ou à éviter des champs électriques tangentiels générés entre un corps humain et l'antenne lorsque l'antenne se rapproche du corps humain, ce qui permet de réduire l'absorption d'énergie de rayonnement d'antenne par le corps humain lorsque l'antenne se rapproche du corps humain, et d'améliorer ainsi l'efficacité de l'antenne lorsque celle-ci se rapproche du corps humain.
PCT/CN2023/117544 2022-09-29 2023-09-07 Antenne et dispositif électronique WO2024067012A1 (fr)

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CN202211200979.8 2022-09-29
CN202211200979.8A CN117832832A (zh) 2022-09-29 2022-09-29 天线及电子设备

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070182658A1 (en) * 2006-02-07 2007-08-09 Nokia Corporation Loop antenna with a parasitic radiator
CN108281776A (zh) * 2017-12-25 2018-07-13 广东曼克维通信科技有限公司 Uhf rfid读卡器系统及其读卡器天线
CN111740218A (zh) * 2020-06-29 2020-10-02 维沃移动通信有限公司 电子设备
CN111987433A (zh) * 2020-09-14 2020-11-24 维沃移动通信有限公司 天线结构及电子设备
CN113036405A (zh) * 2021-03-09 2021-06-25 维沃移动通信有限公司 天线结构及电子设备

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070182658A1 (en) * 2006-02-07 2007-08-09 Nokia Corporation Loop antenna with a parasitic radiator
CN108281776A (zh) * 2017-12-25 2018-07-13 广东曼克维通信科技有限公司 Uhf rfid读卡器系统及其读卡器天线
CN111740218A (zh) * 2020-06-29 2020-10-02 维沃移动通信有限公司 电子设备
CN111987433A (zh) * 2020-09-14 2020-11-24 维沃移动通信有限公司 天线结构及电子设备
CN113036405A (zh) * 2021-03-09 2021-06-25 维沃移动通信有限公司 天线结构及电子设备

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