CN111193110B

CN111193110B - Antenna device and electronic apparatus

Info

Publication number: CN111193110B
Application number: CN202010148430.3A
Authority: CN
Inventors: 贾玉虎
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2022-01-07
Anticipated expiration: 2040-03-05
Also published as: CN111193110A

Abstract

The embodiment of the application provides an antenna device and electronic equipment, and the antenna device includes: a first radiating arm; a second radiating arm; the parallel double lines comprise a first branch line and a second branch line which are parallel to each other, and the first branch line and the second branch line are electromagnetically coupled; a first feeder line; a second feeder line; the first feeder line is used for feeding a first radio frequency signal into the first branch line, and the first radiation arm, the first branch line, the second branch line and the second radiation arm are jointly used for radiating the first radio frequency signal to the outside in a differential mode; the second feeder line is used for feeding a second radio frequency signal to the first radiation arm and the second radiation arm, and the first radiation arm and the second radiation arm are jointly used for radiating the second radio frequency signal to the outside in a common mode. Thus, the isolation of the antenna device is improved by the design of the parallel double line, the first power feed line and the second power feed line.

Description

Antenna device and electronic apparatus

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to an antenna device and an electronic device.

Background

At present, a conventional Single Input Single Output (SISO) antenna system is not enough to meet the requirements of a new generation of wireless communication system for large capacity, high speed and high reliability due to the limitation of shannon capacity. Meanwhile, a Multiple-Input Multiple-Output (MIMO) antenna system can effectively decompose a communication link into a plurality of parallel sub-channels, thereby greatly improving channel capacity, breaking through the limitation of shannon's theorem and greatly improving reliability.

The MIMO antenna requires multiple antennas integrated on an electronic device to achieve multi-channel data concurrence, and in order to obtain good performance, good isolation is required between these antenna units, but with the development of electronic technology, the electronic device is increasingly miniaturized and light and thin, and the internal space of the electronic device is also increasingly small, so that how to reasonably design an antenna with high isolation of the electronic device becomes a difficult problem.

Disclosure of Invention

The embodiment of the application provides an antenna device and an electronic device, which can improve the isolation of the antenna device.

An embodiment of the present application provides an antenna apparatus, including:

a first radiating arm;

a second radiating arm;

the parallel double lines comprise a first branch line and a second branch line which are parallel to each other, wherein a first end part of the first branch line is electrically connected with the first radiation arm, an end part of the second branch line is electrically connected with the second radiation arm, and the first branch line is electromagnetically coupled with the second branch line;

a first feeder line electrically connected to a second end of the first branch line;

a second feed line electrically connected to the first and second radiation arms;

the first feeder line is used for feeding a first radio frequency signal into the first branch line, and the first radiation arm, the first branch line, the second branch line and the second radiation arm are jointly used for radiating the first radio frequency signal to the outside in a differential mode;

the second feeder line is used for feeding a second radio frequency signal to the first radiation arm and the second radiation arm, and the first radiation arm and the second radiation arm are jointly used for radiating the second radio frequency signal to the outside in a common mode.

An embodiment of the present application further provides an electronic device, including: the antenna device provided by any one of the embodiments is an antenna device provided by any one of the embodiments.

The antenna device provided by the embodiment of the application comprises: a first radiating arm; a second radiating arm; the parallel double lines comprise a first branch line and a second branch line which are parallel to each other, wherein a first end part of the first branch line is electrically connected with the first radiation arm, an end part of the second branch line is electrically connected with the second radiation arm, and the first branch line is electromagnetically coupled with the second branch line; a first feeder line electrically connected to a second end of the first branch line; a second feed line electrically connected to the first and second radiation arms; the first feeder line is used for feeding a first radio frequency signal into the first branch line, and the first radiation arm, the first branch line, the second branch line and the second radiation arm are jointly used for radiating the first radio frequency signal to the outside in a differential mode; the second feeder line is used for feeding a second radio frequency signal to the first radiation arm and the second radiation arm, and the first radiation arm and the second radiation arm are jointly used for radiating the second radio frequency signal to the outside in a common mode. In the antenna device, when the antenna device simultaneously radiates a first radio-frequency signal to the outside in a differential mode and radiates a second radio-frequency signal to the outside in a common mode, the isolation of the antenna device can be improved because the antenna device is simultaneously in the differential mode state and the common mode state.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Fig. 2 is a schematic view of a first structure of an antenna device according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a second structure of an antenna device according to an embodiment of the present application.

Fig. 4 is a cross-sectional view of the antenna device 200 shown in fig. 3 taken along the P-P direction.

Fig. 5 is a schematic structural diagram of a third antenna device according to an embodiment of the present application.

Fig. 6 is a schematic diagram of a fourth structure of an antenna apparatus according to an embodiment of the present application.

Fig. 7 is a schematic diagram of a fifth structure of an antenna apparatus according to an embodiment of the present application.

Fig. 8 is a schematic diagram of a sixth structure of an antenna apparatus according to an embodiment of the present application.

Fig. 9 is a first current diagram of an antenna apparatus according to an embodiment of the present application.

Fig. 10 is a second current schematic diagram of an antenna device according to an embodiment of the present application.

Fig. 11 is a third current diagram of an antenna device according to an embodiment of the present application.

Fig. 12 is a fourth current schematic diagram of an antenna device according to an embodiment of the present application.

Fig. 13 is a graph illustrating S parameters of an antenna device according to an embodiment of the present disclosure.

Fig. 14 is a graph illustrating radiation efficiency and system efficiency of an antenna device according to an embodiment of the present application.

Fig. 15 is a first radiation pattern of the antenna device according to the embodiment of the present application.

Fig. 16 is a second radiation pattern of the antenna device according to the embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides electronic equipment. The electronic device may be a smart phone, a tablet computer, or other devices, and may also be a game device, an AR (Augmented Reality) device, an automobile device, a data storage device, an audio playing device, a video playing device, a notebook computer, a desktop computing device, or other devices.

Referring to fig. 1, fig. 1 is a schematic view of a first structure of an electronic device 100 according to an embodiment of the present disclosure.

The electronic device 100 includes a display screen 10, a housing 20, a circuit board 30, and a battery 40.

The display screen 10 is disposed on the casing 20 to form a display surface of the electronic device 100 for displaying images, texts, and other information. The Display screen 10 may include a Liquid Crystal Display (LCD) or an Organic Light-Emitting Diode (OLED) Display screen.

It will be appreciated that the display screen 10 may include a display surface and a non-display surface opposite the display surface. The display surface is a surface of the display screen 10 facing a user, i.e. a surface of the display screen 10 visible to a user on the electronic device 100. The non-display surface is a surface of the display screen 10 facing the inside of the electronic device 100. The display surface is used for displaying information, and the non-display surface does not display information.

It will be appreciated that a cover plate may also be provided over the display screen 10 to protect the display screen 10 from scratching or water damage. The cover plate may be a transparent glass cover plate, so that a user can observe contents displayed on the display screen 10 through the cover plate. It will be appreciated that the cover plate may be a glass cover plate of sapphire material.

The housing 20 is used to form an outer contour of the electronic apparatus 100 so as to accommodate electronic devices, functional components, and the like of the electronic apparatus 100, while forming a sealing and protecting function for the electronic devices and functional components inside the electronic apparatus. For example, the camera, the circuit board, and the vibration motor of the electronic device 100 may be disposed inside the housing 20. It will be appreciated that the housing 20 may include a center frame and a battery cover.

The middle frame may have a thin plate-like or sheet-like structure, or may have a hollow frame structure. The middle frame is used for providing a supporting function for the electronic devices or functional components in the electronic device 100 so as to mount the electronic devices or functional components of the electronic device 100 together. For example, the middle frame may be provided with a groove, a protrusion, a through hole 284, and the like, so as to facilitate mounting of the electronic device or the functional components of the electronic apparatus 100. It is understood that the material of the middle frame may include metal or plastic.

The battery cover is connected with the middle frame. For example, the battery cover may be attached to the center frame by an adhesive such as a double-sided tape to achieve connection with the center frame. The battery cover is used for sealing the electronic devices and functional components of the electronic device 100 inside the electronic device 100 together with the middle frame and the display screen 10, so as to protect the electronic devices and functional components of the electronic device 100. It will be appreciated that the battery cover may be integrally formed. In the molding process of the battery cover, a post-camera mounting hole and other structures can be formed on the battery cover. It is understood that the material of the battery cover may also include metal or plastic.

A circuit board 30 is disposed inside the housing 20. For example, the circuit board 30 may be mounted on a middle frame of the case 20 to be fixed, and the circuit board 30 is sealed inside the electronic device by a battery cover. Specifically, the circuit board may be installed at one side of the loading plate, and the display screen is installed at the other side of the loading plate. The circuit board 30 may be a main board of the electronic device 100. One or more of functional components such as a processor, a camera, an earphone interface, an acceleration sensor, a gyroscope, and a motor may also be integrated on the circuit board 30. Meanwhile, the display screen 10 may be electrically connected to the circuit board 30 to control the display of the display screen 10 by a processor on the circuit board 30.

The battery 40 is disposed inside the case 20. For example, the battery 40 may be mounted on a middle frame of the case 20 to be fixed, and the battery 40 is sealed inside the electronic device by a battery cover. Meanwhile, the battery 40 is electrically connected to the circuit board 30 to enable the battery 40 to supply power to the electronic device 100. The circuit board 30 may be provided thereon with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 40 to the various electronic devices in the electronic apparatus 100.

The electronic device 100 is further provided with an antenna device 200, and the antenna device 200 is configured to radiate a radio frequency signal to the outside to implement a wireless communication function of the electronic device 100. The radio frequency signal may include one of a cellular network signal, a Wireless Fidelity (Wi-Fi) signal, a Global Positioning System (GPS) signal, and a Bluetooth (BT) signal.

Parts of the antenna device 200 may be integrated on the circuit board 30 inside the housing 20, for example, a signal processing chip and a signal processing circuit in the antenna device 200 may be integrated on the circuit board 30. In addition, some components of the antenna device 200 may be disposed directly inside the housing 20. For example, a radiator or a conductor structure of the antenna device 200 for radiating signals may be directly disposed inside the housing 20.

Referring to fig. 2, fig. 2 is a first structural diagram of an antenna device 200 according to an embodiment of the present disclosure. The antenna device 200 includes a first radiation arm 21, a second radiation arm 22, a parallel double line 23, a first power feed line 24, and a second power feed line 25.

The parallel double wire 23 includes a first branch wire 231 and a second branch wire 232 parallel to each other, the first branch wire 231 is electromagnetically coupled to the second branch wire 232, the first branch wire 231 is electrically connected to the first radiation arm 21, and the second branch wire 232 is electrically connected to the second radiation arm 22. The first branch line 231 includes a first end 2312 and a second end 2314 which are opposite to each other, and the first branch line 231 is electrically connected with the first radiation arm 21 through the first end 2312; the second branch 232 also includes two opposite ends, and the second branch 232 is electrically connected to the second radiating arm 22 through either one of the two ends.

Wherein the first feeding line 24 is electrically connected to the second end 2314 of the first branch line 231, the first feeding line 24 is used for feeding a first radio frequency signal to the first branch line 231, and when the first branch line 231 transmits the first radio frequency signal, a magnetic field generated by a current change on the first branch line 231 induces an induced voltage on the second branch line 232, so as to realize a process of coupling energy of the second branch line 232 of the parallel double line 23. The induced voltage on the second leg 232 (also referred to as the back voltage) is the same amplitude and opposite phase as the voltage on the first leg 231 (also referred to as the forward voltage).

As described above, when the first feeder line 24 feeds the first rf signal to the first branch line 231, the inductive coupling between the first branch line 231 and the second branch line 232 in the parallel dual lines 23 occurs, so that the voltage signal with the same amplitude and the opposite phase as those on the first branch line 231 is generated on the second branch line 232 to complete the energy coupling between the second branch line 232 and the first branch line 231. Through the inductive coupling between the first branch line 231 and the second branch line 232, the target rf signal with the same voltage amplitude and the opposite phase as the first rf signal is fed into the second radiating arm 22. Since the first rf signal fed into the first radiating arm 21 and the target rf signal fed into the second radiating arm 22 have the same amplitude and opposite phase, the first rf signal and the target rf signal are differential signals.

At this time, the first radiation arm 21, the first branch line 231, the second branch line 232, and the second radiation arm 22 are collectively used to radiate the first radio frequency signal to the outside in a Differential Mode (DM).

In addition, the second feeder line 25 is electrically connected to both the first radiation arm 21 and the second radiation arm 22, and the second feeder line 25 is configured to feed a second radio frequency signal having the same amplitude and the same phase to the first radiation arm 21 and the second radiation arm 22, respectively. Since the second rf signal fed into the first radiating arm 21 and the second rf signal fed into the second radiating arm 22 have the same amplitude and the same phase, the second rf signal fed into the first radiating arm 21 and the second rf signal fed into the second radiating arm 22 are common mode signals, so that the first radiating arm 21 and the second radiating arm 22 commonly radiate the second rf signal to the outside in a Common Mode (CM).

Further, the antenna device 200 further includes a first signal source 26 and a second signal source 27, the first signal source 26 is electrically connected to the first feeding line 24, and the first signal source 26 is configured to provide the first radio frequency signal; the second signal source 27 is electrically connected to the second feeder 25, and the second signal source 27 is configured to provide the second radio frequency signal.

The first radio frequency signal and the second radio frequency signal may comprise one of a cellular network signal, a wireless fidelity signal, a global positioning system signal, a bluetooth signal. Correspondingly, the first signal source and the second signal source may be cellular communication chips for providing the cellular network signal; the first signal source and the second signal source can be Wi-Fi chips and are used for providing the Wi-Fi signals; the first signal source and the second signal source can be GPS chips and are used for providing the GPS signals; the first signal source and the second signal source may also be BT chips for providing the BT signals.

In some embodiments, the frequency bands of the first radio frequency signal and the second radio frequency signal are the same, and when the first signal source 26 and the second signal source 27 operate simultaneously, the antenna device forms a multi-input multi-output antenna device, so that multiplexing of the antenna device can be achieved, the number of conductor structures for transmitting wireless signals in the electronic device 100 can be reduced, and the internal space of the electronic device 100 can be saved.

As can be seen from the above, the antenna device provided in the embodiment of the present application includes: a first radiation arm 21; a second radiating arm 22; a parallel dual wire 23 including a first branch wire 231 and a second branch wire 232 which are parallel to each other, wherein a first end 2312 of the first branch wire 231 is electrically connected to the first radiating arm 21, an end of the second branch wire 232 is electrically connected to the second radiating arm 22, and the first branch wire 231 is electromagnetically coupled to the second branch wire 232; a first feeder line 24 electrically connected to the second end 2314 of the first branch line 231; a second feeder line 25 electrically connected to the first and second radiation arms 21 and 22; wherein the first feeding line 24 is used for feeding a first radio frequency signal to the first branch line 231, and the first radiating arm 21, the first branch line 231, the second branch line 232 and the second radiating arm 22 are collectively used for radiating the first radio frequency signal to the outside in a differential mode; the second feeding line 25 is used for feeding a second radio frequency signal to the first radiation arm and the second radiation arm 22, and the first radiation arm 21 and the second radiation arm 22 are used together for radiating the second radio frequency signal to the outside in a common mode. In the antenna device, when the antenna device simultaneously radiates a first radio-frequency signal to the outside in a differential mode and radiates a second radio-frequency signal to the outside in a common mode, the isolation of the antenna device can be improved because the antenna device is simultaneously in the differential mode state and the common mode state.

In the description of the present application, it is to be understood that terms such as "first", "second", and the like are used merely to distinguish one similar element from another, and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated.

Referring to fig. 3 and 4, fig. 3 is a second structural schematic diagram of an antenna device according to an embodiment of the present application, and fig. 4 is a cross-sectional view of the antenna device shown in fig. 3 along a P-P direction.

The antenna device 200 may further include a dielectric substrate 28, where the dielectric substrate 28 includes a first surface 281 and a second surface 282 that are opposite to each other. The first branch line 231 and the second branch line 232 are disposed on the first surface 281, and the first feeding line 24 is disposed on the second surface 282.

The first branch line 231 and the second branch line 232 are metal lines with a certain width, and the metal material may be gold, silver, copper, or the like. The first branch line 231 and the second branch line 232 may be formed on the first surface 281 of the dielectric substrate 28 in parallel with each other by plating, engraving or printing techniques.

It can be understood that, since the first branch line 231 and the second branch line 232 are made of a metal material and the dielectric substrate 28 is spaced apart from the first feed line 24, the first branch line 231 and the second branch line 232 can be used as a grounding metal plate of the first feed line 24, so that a microstrip transmission line is formed by the first branch line 231, the second branch line 232, the dielectric substrate 28 and the first feed line 24, so as to improve the transmission efficiency of the radio frequency signal through the microstrip transmission line.

In some embodiments, with continued reference to fig. 4, the dielectric substrate is further provided with a through hole, and the through hole is provided with a conductive structure 285; the first branch line 231 and the first feeding line 24 are electrically connected through the conductive structure 285. One end of the conductive structure 285 is electrically connected to the second end 2314 of the first branch line 231, and the other end of the conductive structure 285 is electrically connected to one end of the first feeding line 24, so that the first feeding line and the first branch line are electrically connected through the conductive structure 285.

In some embodiments, the conductive structure is a lumped element including an inductance and a capacitance. For example, the conductive structure may be a shorting post.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating a third structure of an antenna device 200 according to an embodiment of the present disclosure. Wherein the second feed line 25 includes a first output 251 and a second output 252;

the first radiating arm 21 is provided with a first feeding point 211 and a second feeding point 213 at an interval, the first feeding point 211 is electrically connected to the first end 2312 of the first branch line 231, and the second feeding point 213 is electrically connected to the first output end 251 of the second branch line 25;

the second radiating arm 22 is provided with a third feeding point 221 and a fourth feeding point 223 at intervals;

the third feeding point 221 is electrically connected to one end of the second branch 232, and the fourth feeding point 223 is electrically connected to the second output 252 of the second feeding line 25.

In addition, please refer to fig. 6, fig. 6 is a schematic diagram of a fourth structure of the antenna device according to the embodiment of the present application. Wherein the first radiating arm 21 includes a third end 214 and a fourth end 215 opposite to each other, and the second radiating arm 22 includes a fifth end 224 and a sixth end 225 opposite to each other.

The distance L1 between the first feeding point 211 and the fourth end 215 is equal to the distance L2 between the third feeding point 221 and the fifth end 224; the distance L3 between the second feeding point 213 and the fourth end 215 is equal to the distance L4 between the fourth feeding point 223 and the fifth end 224.

Wherein, the distance between the feed point and the end part of the radiation arm is the straight-line distance between the two points. When the distance L1 between the first feeding point 211 and the fourth end 215 is equal to the distance L2 between the third feeding point 221 and the fifth end 224; and the distance L3 between the second feeding point 213 and the fourth terminal 215 is equal to the distance L4 between the fourth feeding point 223 and the fifth terminal 224, it means that the first feeding point 211 on the first radiating arm 21 and the third feeding point 221 on the second radiating arm 22 are in an axisymmetric relationship, and the second feeding point 213 on the first radiating arm 21 and the fourth feeding point 223 on the second radiating arm 22 are also in an axisymmetric relationship.

In some embodiments, with continued reference to fig. 5, the second feed line 25 further includes an input 253, the input 253 for receiving a second radio frequency signal.

The distance between the first output 251 and the input 253 is equal to the distance between the second output 252 and the input 253; the distance between the first output end 251 and the input end 253 is a linear distance between the first output end 251 and the input end 253, and the distance between the second output end 252 and the input end 253 is a linear distance between the second output end 252 and the input end 253. The second feed line 25 further includes a first feed section and a second feed section, and the first feed section and the second feed section are in an axisymmetric relationship.

Wherein the first feeding segment is located between the first output end 251 and the input end 253, and the second feeding segment is located between the second output end 252 and the input end 253.

It can be understood that, when the second signal source operates, it is because the first feeding section and the second feeding section are in an axisymmetric relationship, so that the current intensities of the radio-frequency signals flowing to the first radiating arm and the second radiating arm through the first feeding section and the second feeding section are the same, so that the first radiating arm and the second radiating arm commonly radiate the second radio-frequency signal to the outside in a common mode.

In some embodiments, please refer to fig. 7, and fig. 7 is a schematic diagram illustrating a fourth structure of an antenna device according to an embodiment of the present application. Wherein the second feed line 25 further comprises a common connection point 254, said common connection point 254 being adapted to connect said first output 251 with said input 253 and to connect said second output 252 with said input 253.

The second feed line 25 branches at the common junction 254 to produce a first feed branch between the first output 251 and the common junction 254 and a second feed branch between the second feed branch and the common junction 254. The first feeding branch and the second feeding branch are in axial symmetry.

Referring to fig. 8, fig. 8 is a schematic view illustrating a sixth structure of an antenna device according to an embodiment of the present disclosure. In the antenna apparatus provided in any of the above embodiments, the first branch line 231 further includes a first connection point 2313, and the second branch line 232 further includes a second connection point 2323; the first connection point 2313 is disposed between the first end 2312 and the second end 2314, and the second connection point 2323 is disposed between two ends of the second branch line 232.

The antenna device further includes a first loading circuit and a second loading circuit, wherein one end of the first loading circuit is electrically connected to the first connection point 2313, and one end of the second loading circuit is electrically connected to the second connection point 2323. The first loading circuit and the second loading circuit are lumped elements, and the lumped elements comprise inductances.

In some embodiments, the antenna arrangement further comprises a ground plane, the ground plane 29 being used to form a common ground. The ground plane 22 may be formed by a conductor, a printed circuit, a metal printed layer, or the like in the electronic device 100. For example, the ground plane 22 may be disposed on a circuit board 30 of the electronic device 100. The ground plane 22 may also be formed on the housing 20 of the electronic device 100, for example, the ground plane 22 may be formed by a middle frame of the housing 20, or the ground plane 29 may also be formed by a battery cover of the housing 20.

The ground plane 29 comprises a first ground point 291 and a second ground point 292 arranged at a distance. The first grounding point 291 and the second grounding point 292 may be, for example, an end portion of the ground plane 29, or may also be a protruding structure on the ground plane 29, or may also be a pad formed on the ground plane 29, or may also be an area region on the ground plane 29, and so on.

In addition, the other end of the first loading circuit is connected to the first grounding point 291, so that the grounding of the first radiating arm 21 is realized by the first loading circuit. The other end of the second loading circuit is electrically connected to the second grounding point 292, so as to realize grounding of the second radiating arm 22 through the second loading circuit.

Referring to fig. 9, fig. 9 is a first current schematic diagram of an antenna device according to an embodiment of the present disclosure. When the first signal source 26 of the antenna device is in an operating state and the first radio frequency signal is fed to the first branch line 231 through the first feeder line 24, the electromagnetic induction occurs between the first branch line 231 and the second branch line 232 due to the current change of the first branch line 231, and then the backward voltage (-) having the same amplitude but opposite phase to the forward voltage (+) of the first branch line 231 is generated on the second branch line 232.

At this time, a corresponding voltage difference is formed between the first branch line 231 and the second branch line 232, so that the current on the first radiating arm 21 flows from the third end 214 to the fourth end 215, and the current on the second radiating arm 22 flows from the fifth end 224 to the sixth end 225. It can be seen that the direction of the current on the first radiating arm 21 coincides with the direction of the current on the second radiating arm 22.

Meanwhile, when the first signal source 26 is in an operating state, the direction of the current received by the first output terminal 251 of the second feeding line 25 is also the same as the direction of the current received by the second output terminal 252, and is the same as the direction of the current of the first and

second radiation arms

21 and 22. Since the current intensity of the first radiating arm 21 is the same amplitude but opposite phase to the current intensity of the second radiating arm 22. Therefore, when the second signal source 27 receives the current from the first output terminal 251 and the second output terminal 252 of the second feeding line 25, the two currents in the same direction cancel each other out, so that when the first signal source 26 is in the working state, the second signal source 27 can shield the energy of the first signal source 26, thereby enhancing the isolation of the antenna device.

Referring to fig. 10, fig. 10 is a second current schematic diagram of an antenna device according to an embodiment of the present disclosure. According to the antenna device provided in any of the above embodiments, when the second signal source 27 of the antenna device is in an operating state and the second radio frequency signal is fed to the first radiation arm 21 and the second radiation arm 22 through the first output terminal 251 and the second output terminal 252 of the second feeder 25, the current flow directions of the first radiation arm 21 and the second radiation arm 22 are opposite.

The current of the first radiating arm 21 flows from the fourth end 215 to the third end 214, and the current of the second radiating arm 22 flows from the fifth end 224 to the sixth end 225. It can be seen that, when the second signal source 27 is in an operating state, since the current flow directions of the first radiation arm 21 and the second radiation arm 22 are opposite, the signal strengths of the first signal source received by the second signal source through the first output end 251 and the second output end 252 of the second feeder 25 are equal and opposite, and can be mutually cancelled, so that the second signal source 27 cannot receive the energy of the first signal source 26, and the isolation of the antenna device is high.

Referring to fig. 11 and 12, fig. 11 is a third current schematic diagram of an antenna device according to an embodiment of the present disclosure. Fig. 12 is a fourth current schematic diagram of an antenna device according to an embodiment of the present application. Meanwhile, with continuing reference to fig. 3 and 4, the antenna device in fig. 11 and 12 is the antenna device shown in fig. 3 and 4. Note that the direction of the arrow in the drawing is a current direction.

As shown in fig. 11, when the first signal source 26 of the antenna device is in an operating state and the first radio frequency signal is fed to the first branch line 231 through the first feeding line 24, as described above, the first branch line 231, the second branch line 232, the dielectric substrate 28 and the first feeding line 24 form a microstrip transmission line, so that when the first signal source 26 feeds the first radio frequency signal to the parallel two lines through the first feeding line 24, the first branch line 231 generates a corresponding current change, so that electromagnetic induction occurs between the first branch line 231 and the second branch line 232, and a backward voltage having the same amplitude as but opposite phase to the forward voltage of the first branch line 231 is generated on the second branch line 232.

At this time, a corresponding voltage difference is formed between the first branch line 231 and the second branch line 232, so that the current on the first radiation arm flows from the third end to the fourth end, and a current is formed on the first radiation arm as shown in the figure. The current on the second radiating arm 22 flows from the fifth end to the sixth end, so that a current is formed on the first radiating arm as shown in the figure. As shown, the direction of the current on the first radiating arm 21 is consistent with the direction of the current on the second radiating arm 22. At the same time, when the first signal source 26 is in operation, a current is generated in the ground plane 28 as shown, so that a conductive loop is formed between the antenna arrangement and said ground plane.

In addition, as shown in fig. 12, when the second signal source 27 of the antenna device is in an operating state and the second radio frequency signal is fed to the first radiation arm 21 and the second radiation arm 22 through the first output terminal 251 and the second output terminal 252 of the second feeder 25, the currents on the first radiation arm 21 and the second radiation arm 22 are shown in the figure, and it can be seen that the current flowing directions of the first radiation arm 21 and the second radiation arm 22 are opposite. And, when the second signal source 27 is in operation, a current is generated in the ground plane 28 as shown in the figure, so that a conductive loop is formed between the antenna device and said ground plane.

It can be understood that due to the design of the parallel twin lines 23, the first feeding line 24 and the second feeding line 25 in the antenna device of the embodiment of the present application, the isolation of the antenna device of the present application is high when the first signal source 26 and the second signal source 27 operate. Even when the first signal source 26 and the second signal source 27 are simultaneously in an operating state, interference between the two signal sources can be avoided through the design of the parallel double wires 23, the first feeder line 24 and the second feeder line 25, multiplexing of the single antenna bodies of the first radiation arm 21 and the second radiation arm 22 is achieved, and therefore the design space of the antenna device in the electronic equipment is reduced.

Referring to fig. 13 and 14, fig. 13 is a graph illustrating an S parameter of the antenna device according to the embodiment of the present disclosure, and fig. 14 is a graph illustrating a radiation efficiency and a system efficiency of the antenna device according to the embodiment of the present disclosure.

In the coordinate system shown in fig. 13, the abscissa represents the radiation frequency of the antenna device, and the ordinate represents the corresponding reflection coefficient (also referred to as S-parameter) of the antenna device. Specifically, the S parameter may include: an S11 parameter (input reflection coefficient), an S12 parameter (inverse transmission coefficient), and an S22 parameter (output reflection coefficient).

As shown in fig. 13When the first signal source and the second signal source work simultaneously and the frequency bands of the first radio frequency signal and the second radio frequency signal are 4-5GHZ, the S11 parameter of the antenna device is stabilized at-25-0 decibel₍decibel，dB₎In the meantime. The S12 parameter of the antenna arrangement settles below-15 dB. The S22 parameter of the antenna device stabilized around-5 dB. Therefore, the S parameter performance of the antenna device provided by the embodiment of the application is good when the antenna device works at 4-5GHZ, and the isolation degree of the antenna device is good.

Meanwhile, the abscissa in the coordinate system shown in fig. 14 also represents the radiation frequency of the antenna device, and the ordinate represents the corresponding antenna efficiency of the antenna device. The antenna efficiency may include, among other things, radiation efficiency and system efficiency.

As shown in fig. 14, when the first signal source is in an operating state and the frequency band of the first rf signal is 4.2 to 5GHZ, the system efficiency of the antenna device is stabilized above-1 dB, and the radiation efficiency of the antenna device is stabilized above-2 dB.

In addition, when the second signal source is in a working state and the frequency band of the second radio frequency signal is 4.2-5 GHZ, the system efficiency of the antenna device is stabilized above-3 dB. Furthermore, it can be seen from fig. 14 that the radiation efficiency of the antenna device is mostly above-2 dB when the radiation frequency of the antenna device is between 4 and 5 GHZ.

Therefore, when the antenna device provided by the embodiment of the application radiates radio-frequency signals of a 4-5GHZ frequency band, the S parameter performance of the antenna device is good, and the system radiation efficiency and the system efficiency are correspondingly improved.

Referring to fig. 15, fig. 15 is a first radiation pattern of the antenna device according to the embodiment of the present application.

When the first signal source is in an operating state, that is, the first radiation arm, the first branch line, the second branch line, and the second radiation arm together radiate the first radio frequency signal to the outside in a differential mode, the first radiation arm generates a first radiation field, and the first radiation field may cover a certain spatial area around the electronic device 100. The second radiating arm generates a second radiating field, which may also cover an area of space around the electronic device 100. Wherein the second radiation field at least partially overlaps the first radiation field, thereby enhancing both the area of the overall radiation field around the electronic device 100 and the field strength of the overlapping area.

Referring to fig. 16, fig. 16 is a second radiation pattern of the antenna device according to the embodiment of the present application.

When the second signal source is in an operating state, that is, when a second radio frequency signal is fed into the first radiating arm and the second radiating arm through the second feed line, the first radiating arm and the second radiating arm together radiate the second radio frequency signal to the outside in a common mode. At this time, the first radiation arm generates a third radiation field having a direction opposite to that of the first radiation field, and the third radiation field may cover a region of a certain space around the electronic device 100. The second radiation arm generates a fourth radiation field, the direction of the fourth radiation field is opposite to that of the second radiation field, the fourth radiation field can also cover a certain space area around the electronic device 100, and the third radiation field and the fourth radiation field have substantially no overlapping area.

As can be seen from fig. 15 and 16, there is a significant disparity between a first main direction of the antenna arrangement in the far-field radiation pattern when the first signal source is in operation and a second main direction of the antenna arrangement in the far-field radiation pattern when the second signal source is in operation.

Therefore, when the first signal source and the second signal source are simultaneously in the working state, the antenna device radiates the first radio-frequency signal to the outside in the differential mode, and simultaneously radiates the second radio-frequency signal to the outside in the common mode. Based on the differential mode and the common mode, the antenna device has excellent isolation and directional diagram characteristics, so that the Envelope Correlation Coefficient (ECC) characteristic of the antenna device is excellent, and the antenna device is suitable for a multi-input multi-output antenna system.

The antenna device and the electronic device provided in the embodiments of the present application are described in detail above. The principles and implementations of the present application are described herein using specific examples, which are presented only to aid in understanding the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. An antenna device, comprising:

the first radiating arm is provided with a first feeding point and a second feeding point at intervals;

the second radiating arm is provided with a third feeding point and a fourth feeding point at intervals;

a second feed line electrically connected to the first and second radiation arms; the second feed line includes a first output and a second output;

wherein the first feeding point is electrically connected with a first end of the first branch line, and the second feeding point is electrically connected with a first output end of the second feeding line; the third feeding point is electrically connected with one end part of the second branch line, and the fourth feeding point is electrically connected with the second output end of the second feeding line;

2. The antenna device of claim 1, wherein:

the first radiating arm includes third and fourth opposing ends and the second radiating arm includes fifth and sixth opposing ends;

the distance between the first feeding point and the fourth end portion is equal to the distance between the third feeding point and the fifth end portion;

the distance between the second feeding point and the fourth end portion is equal to the distance between the fourth feeding point and the fifth end portion.

3. The antenna device according to claim 1 or 2, wherein the second feed line further comprises an input for receiving a second radio frequency signal;

the distance between the first output and the input is equal to the distance between the second output and the input.

4. The antenna device of claim 1, further comprising a dielectric substrate including opposing first and second surfaces;

the first branch line and the second branch line are arranged on the first surface, the first feed line is arranged on the second surface, and the first feed line is a microstrip transmission line;

at least a portion of the first feed line and at least a portion of the first branch line are disposed opposite the dielectric substrate, and at least a portion of the first feed line and at least a portion of the second branch line are disposed opposite the dielectric substrate.

5. The antenna device according to claim 4, wherein the dielectric substrate is further provided with a through hole, and the through hole is internally provided with a conductive structure;

the first branch line and the first feeder line are electrically connected through the conductive structure.

6. The antenna device according to claim 1 or 2, characterized in that:

the first branch line further comprises a first connection point, and the second branch line further comprises a second connection point;

the first connecting point is arranged between the first end part and the second end part, and the second connecting point is arranged between two end parts of the second branch line;

the antenna device further comprises a first loading circuit and a second loading circuit, wherein the first loading circuit is electrically connected with the first connecting point, and the second loading circuit is electrically connected with the second connecting point.

7. The antenna device of claim 6, wherein the first loading circuit and the second loading circuit each comprise an inductor.

8. The antenna device according to claim 1 or 2, wherein the first and second radiating arms radiate the first and second rf signals to the outside in the same frequency band to form a mimo antenna device.

9. An electronic device, comprising: an antenna device as claimed in any one of claims 1 to 8.