CN117977204A

CN117977204A - Antenna assembly and electronic equipment

Info

Publication number: CN117977204A
Application number: CN202410232772.1A
Authority: CN
Inventors: 刘友文
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2024-02-29
Filing date: 2024-02-29
Publication date: 2024-05-03

Abstract

The application provides an antenna assembly and electronic equipment, wherein a radiation branch comprises a first radiator and a second radiator, wherein the first radiator comprises a first grounding point, a first feed point and a first free end; the second radiator comprises a second free end, a connecting point and a second grounding point, a coupling gap is formed between the first free end and the second free end, one end of the first tuning circuit is electrically connected with the connecting point, and the other end of the first tuning circuit is grounded; the first signal source is used for exciting the first radiator to form a first resonance mode; and the first tuning circuit is used for exciting the second radiator to form a second resonance mode when the first tuning circuit is configured to be electrically connected with the connecting point, and resonance current of the second resonance mode flows through the ground of the first tuning circuit. The antenna assembly occupies less space and can support more frequency bands and support wider bandwidth frequency bands.

Description

Antenna assembly and electronic equipment

Technical Field

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

Background

For antenna design on electronic equipment, how to design more resonance modes on antenna branches occupying less space to support more frequency bands and support frequency bands with wider bandwidths becomes a technical problem to be solved.

Disclosure of Invention

The application provides an antenna component which has more resonant modes designed on antenna branches with less occupied space so as to support more frequency bands and support frequency bands with wider bandwidths, and electronic equipment with the antenna component.

The application provides an antenna assembly, comprising:

The radiating branch comprises a first radiator and a second radiator, wherein the first radiator comprises a first grounding point, a first feed point and a first free end; the second radiator comprises a second free end, a connecting point and a second grounding point, and a coupling gap is formed between the first free end and the second free end;

One end of the first tuning circuit is electrically connected with the connecting point, and the other end of the first tuning circuit is grounded; and

The first signal source is electrically connected with the first feed point and is used for providing a first excitation signal of a first frequency band, the first excitation signal is used for exciting the radiation branch to form a first resonance mode, and the first resonance mode is a 1/4 wavelength mode which is resonated between the first grounding point and the first free end and supports the first frequency band; the first excitation signal is further used for exciting the radiation branch to form a second resonance mode when the first tuning circuit is configured to be electrically conducted with the connection point, the second resonance mode is a 1/2 wavelength mode which resonates between the connection point and the second grounding point and supports a second frequency band, the resonance current of the second resonance mode flows through the first tuning circuit, and the center frequency point of the second frequency band is larger than the center frequency point of the first frequency band.

The antenna assembly and the electronic device provided by the embodiment of the application have the advantages that the radiation branch comprises a first radiator and a second radiator, and the first radiator comprises a first grounding point, a first feed point and a first free end; the second radiator comprises a second free end, a connecting point and a second grounding point, a coupling gap is formed between the first free end and the second free end, one end of the first tuning circuit is electrically connected with the connecting point, and the other end of the first tuning circuit is grounded; the first signal source is electrically connected with the first feed point and is used for providing a first excitation signal of a first frequency band, the first excitation signal is used for exciting the radiation branch to form a first resonance mode, and the first resonance mode is a 1/4 wavelength mode which resonates between the first grounding point and the first free end and supports the first frequency band; the first excitation signal is further used for exciting the radiation branch to form a second resonance mode when the first tuning circuit is configured to be electrically conducted with the connection point, the second resonance mode is a 1/2 wavelength mode which resonates between the connection point and the second grounding point and supports a second frequency band, the resonance current of the second resonance mode flows through the ground under the first tuning circuit, the center frequency point of the second frequency band is larger than the center frequency point of the first frequency band, and the first resonance mode and the second resonance mode are formed on the excitation radiation branch, so that more resonance modes are designed on the antenna branch occupying less space to support more frequency bands and support the frequency band with wider bandwidth.

The application provides an antenna assembly, which comprises:

The first antenna branch comprises a first antenna free end, a first antenna feed point and a first antenna grounding point;

A first antenna signal source electrically connected to the first antenna feed point, the first antenna signal source configured to excite the first antenna branch to form a first target resonant mode supporting a first target frequency band;

The first decoupling circuit is electrically connected between the first antenna feed point and the first antenna signal source, and the first decoupling circuit is used for presenting a low impedance state to the first target frequency band and presenting a high impedance state to the second target frequency band;

the second antenna signal source is electrically connected with the first antenna feed point and is used for exciting the first antenna branch to form a second target resonance mode supporting the second target frequency band; and

The second decoupling circuit is electrically connected between the first antenna feed point and the second antenna signal source, and the second decoupling circuit is used for presenting a low impedance state to the second target frequency band and presenting a high impedance state to the first target frequency band.

The antenna assembly provided by the embodiment of the application comprises a first antenna free end, a first antenna feed point and a first antenna grounding point through designing a first antenna branch; the first antenna signal source is electrically connected with the first antenna feed point and is used for exciting the first antenna branch to form a first target resonance mode supporting a first target frequency band; the first decoupling circuit is electrically connected between the first antenna feed point and the first antenna signal source, and the first decoupling circuit is used for presenting a low impedance state to the first target frequency band and presenting a high impedance state to the second target frequency band; the second antenna signal source is electrically connected with the first antenna feed point and is used for exciting the first antenna branch to form a second target resonance mode supporting the second target frequency band; the second decoupling circuit is electrically connected between the first antenna feed point and the second antenna signal source, and the second decoupling circuit is used for presenting a low impedance state to the second target frequency band and presenting a high impedance state to the first target frequency band so as to realize that the first antenna signal source and the second antenna signal source are commonly fed to share a first antenna branch and are mutually decoupled, and the mutual interference between the first antenna signal source and the second antenna signal source is reduced while the antenna branch is saved.

The application provides electronic equipment, which comprises the antenna component.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described.

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

FIG. 2 is a partially exploded schematic illustration of an electronic device according to an embodiment of the present application;

FIG. 3 is a back view of an electronic device provided by an embodiment of the present application;

Fig. 4 is a schematic structural diagram of an antenna assembly according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a current distribution of a radiation branch forming a first resonant mode according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a current distribution of a radiation branch forming a second resonant mode according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a current distribution of a third resonant mode formed by a radiating branch according to an embodiment of the present application;

FIG. 8 is a schematic diagram of a current distribution of a radiation branch forming a fourth resonant mode according to an embodiment of the present application;

FIG. 9 is an S-parameter curve of a first resonant mode, a second resonant mode, a third resonant mode, and a fourth resonant mode according to an embodiment of the present application;

Fig. 10 is a graph comparing antenna efficiency with or without second and fourth resonant modes provided by an embodiment of the present application;

Fig. 11 is a schematic structural diagram of a first matching circuit according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a first tuning branch including a first resistor according to an embodiment of the present application;

FIG. 13 is an S-parameter curve of the first, second, third and fourth resonant modes according to the embodiment of the present application when the switch is switched;

Fig. 14 is a schematic diagram of a current distribution of a first resonant mode when the antenna assembly according to the embodiment of the present application is disposed on a first side of an electronic device;

fig. 15 is a schematic diagram of a current distribution of a second resonant mode when the antenna assembly according to the embodiment of the present application is disposed on a first side of an electronic device;

fig. 16 is a schematic diagram of a current distribution of a third resonant mode when the antenna assembly according to the embodiment of the present application is disposed on a first side of an electronic device;

fig. 17 is a schematic diagram of a current distribution of a fourth resonant mode when the antenna assembly according to the embodiment of the present application is disposed on the first side of the electronic device;

Fig. 18 is a schematic structural diagram of an antenna assembly according to an embodiment of the present application further including a second signal source and a second matching circuit;

FIG. 19 is a schematic diagram of a current distribution of a radiation branch forming a fifth resonant mode according to an embodiment of the present application;

fig. 20 is a schematic structural diagram of an antenna assembly according to an embodiment of the present application further including a third signal source and a third matching circuit;

FIG. 21 is a schematic diagram of a current distribution of a radiation branch forming a sixth resonant mode according to an embodiment of the present application;

fig. 22 is a schematic structural diagram of a first matching circuit according to an embodiment of the present application, which further includes a first band-stop circuit and a first band-pass circuit;

fig. 23 is a schematic structural diagram of an antenna assembly according to an embodiment of the present application further including a first band-stop circuit and a second signal source;

fig. 24 is a schematic structural diagram of an antenna assembly according to an embodiment of the present application further including a first band-pass circuit and a third signal source;

Fig. 25 is a schematic structural diagram of a second matching circuit according to an embodiment of the present application, which further includes a second band-stop circuit and a third band-stop circuit;

fig. 26 is a schematic structural diagram of a second band-stop circuit, a third band-stop circuit, a second matching branch, a fourth band-stop circuit, a second band-pass circuit, and a first tuning circuit according to an embodiment of the present application;

Fig. 27 is a schematic structural diagram of an antenna assembly according to an embodiment of the present application further including a fourth matching circuit and a combiner;

fig. 28 is a schematic structural diagram of a radiation branch provided by an embodiment of the present application disposed at a side edge of a frame of an electronic device;

Fig. 29 is a schematic structural diagram of an LB antenna and an N78 antenna according to an embodiment of the present application, where the LB antenna shares a feeding point and decoupling is implemented by an N78 decoupling circuit and an LB decoupling circuit;

FIG. 30 is an S-curve of an LB antenna and an N78 antenna according to an embodiment of the present application;

fig. 31 is a schematic diagram of a current distribution of a fifth resonant mode of the N78 antenna when the antenna assembly provided in the embodiment of the present application is disposed on the first side of the electronic device;

FIG. 32 is a schematic diagram showing a current distribution of a sixth resonant mode of the LB antenna when the antenna assembly provided by the embodiment of the application is arranged on the first side of the electronic device;

Fig. 33 is a schematic structural diagram of an antenna assembly according to an embodiment of the present application, including a first antenna branch, a first antenna signal source, a first decoupling circuit, a second antenna signal source, and a second decoupling circuit;

Fig. 34 is a schematic structural diagram of an antenna assembly according to an embodiment of the present application further including a second antenna branch and a third antenna signal source;

fig. 35 is a schematic diagram of an antenna assembly according to an embodiment of the present application further including a third decoupling circuit, a fourth decoupling circuit, a fifth decoupling circuit, and a sixth decoupling circuit.

Reference numerals illustrate:

An electronic device 1000; an antenna assembly 100; a display screen 200; a middle frame 300; a rear cover 400; a middle plate 310; a frame 320; a top edge 321; a bottom edge 322; a first side 323; a second side 324; a reference floor 500; radiation branches 10; a first tuning circuit 20; a first signal source 30; a first grounding point A; a first feeding point B; a first free end C; a second free end D; a connection point E; a second ground point F; a first matching circuit M1; a first switch K1; a first tuning branch T1; a first resistor R1; a first inductance L1; a first capacitor C1; a second capacitor C2; a first matching branch M11; a third capacitor C3; a second inductance L2; a second feeding point E1; a second signal source 40; a second matching circuit M2; a third signal source 50; a third matching circuit M3; a first band-stop circuit D1; a first sub-inductance L01; a first pass circuit G1; a second feeding point E1; a second band-stop circuit D2; a third band-stop circuit D3; a second matching branch M21; a second sub-inductance L02; a first sub-capacitor C01; a third sub-inductance L03; a second sub-capacitor C02; a fourth sub-inductance L04; a third sub-capacitor C03; a fourth band-stop circuit D4; a second bandpass circuit G2; a fifth sub-inductance L05; a fourth sub-capacitor C04; a fifth sub-capacitance C05; a second switch K2; a second tuning circuit 60; a third capacitor C3; a fourth capacitor C4; a second tuning branch T2; a third inductance L3; a fourth inductance L4; a fourth matching circuit M4; a combiner 70.

Detailed Description

The technical scheme of the present application will be clearly and completely described below with reference to the accompanying drawings. It should be apparent that the described embodiments of the application are only some embodiments, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive effort, based on the embodiments provided by the present application are within the scope of protection of the present application.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will appreciate explicitly and implicitly that the described embodiments of the application may be combined with other embodiments.

The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example: an assembly or device incorporating one or more components is not limited to the listed one or more components, but may alternatively include one or more components not listed but inherent to the illustrated product, or one or more components that may be provided based on the illustrated functionality.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device 1000 according to an embodiment of the application. The electronic device 1000 includes, but is not limited to, a device having a communication function such as a mobile phone, tablet computer, notebook computer, wearable device, unmanned aerial vehicle, robot, digital camera, etc. The embodiment of the application is illustrated by taking a mobile phone as an example, and other electronic devices can refer to the embodiment.

Referring to fig. 2, fig. 2 is a partially exploded schematic illustration of an electronic device 1000. The electronic device 1000 includes an antenna assembly 100, and the operating environment of the antenna assembly 100 is illustrated by taking the electronic device 1000 as a mobile phone. The electronic apparatus 1000 includes a display screen 200, a center 300, and a rear cover 400, which are sequentially disposed in the thickness direction. The middle frame 300 includes a middle plate 310 and a frame 320 surrounding the middle plate 310. Bezel 320 may be a conductive bezel. Of course, in other embodiments, the electronic device 1000 may not have the midplane 310. The display screen 200, the middle plate 310 and the rear cover 400 are sequentially stacked, and an accommodating space is formed between the display screen 200 and the middle plate 310 and between the middle plate 310 and the rear cover 400 to accommodate devices such as a main board, a camera module, a receiver module, a battery, various sensors and the like. One side of the frame 320 is surrounded on the edge of the display screen 200, and the other side of the frame 320 is surrounded on the edge of the rear cover 400, so as to form a complete appearance structure of the electronic device 1000. In the embodiment, the frame 320 and the middle plate 310 are integrally formed, and the frame 320 and the rear cover 400 may be separate structures, which is the working environment of the antenna assembly 100 for example, but the antenna assembly 100 of the present application is not limited to the working environment.

Referring to fig. 3, fig. 3 is a back view of the electronic device 1000. The frame 320 includes a top side 321, a bottom side 322, and a first side 323 and a second side 324 connected to the top side 321 and the bottom side 322. Wherein the top edge 321 is the side far away from the ground when the user holds the electronic device 1000 with the vertical screen, and the bottom edge 322 is the side facing the ground when the user holds the electronic device 1000 with the vertical screen. The first side 323 is the left side of the electronic device 1000 when the user holds the electronic device and erects the screen. The second side 324 is the right side of the electronic device 1000 when held by a user and when the display is in use. Of course, the first side 323 may also be the right side of the electronic device 1000 when the user holds the electronic device. The second side 324 is the left side of the electronic device 1000 when held by a user.

Optionally, the electronic device 1000 further comprises a reference floor 500. The reference floor 500 is provided within the bezel 320. The reference floor 500 is generally rectangular in shape. Because devices are arranged in the mobile phone or other structures are avoided as required, various grooves, holes and the like are formed on the reference ground edge of the reference floor 500. The reference floor 500 includes, but is not limited to, a metal alloy portion that is the midplane 310 and a reference ground metal portion of a circuit board (including the motherboard 600 and the daughter board). In general, the reference ground system in the electronic device 1000 may be equivalently a generally rectangular shape, and is therefore referred to as the reference floor 500. The reference floor 500 does not indicate that the shape of the reference ground is plate-shaped and is a rectangular plate.

The specific structure of the antenna assembly 100 is illustrated in the following description with reference to the accompanying drawings.

Referring to fig. 3 and 4, the antenna assembly 100 includes a radiating branch 10, a first tuning circuit 20, and a first signal source 30.

The radiation branch 10 comprises a first radiator 11. The first radiator 11 includes a first ground point a, a first feeding point B, and a first free end C. Optionally, the first grounding point a and the first free end C are two ends of the first radiator 11. The first feeding point B is located between the first ground point a and the first free end C.

The material of the first radiator 11 is not particularly limited in the present application. Optionally, the material of the first radiator 11 is a conductive material, including but not limited to a conductive material such as a metal, an alloy, and the like. The shape of the first radiator 11 is not particularly limited in the present application. For example, the shape of the first radiator 11 includes, but is not limited to, a bar shape, a sheet shape, a rod shape, a coating shape, a film shape, and the like. The first radiator 11 shown in fig. 3 is only an example and does not limit the shape of the first radiator 11 provided by the present application. In this embodiment, the first radiators 11 are all in a strip shape. The present application is not limited to the extending trace of the first radiator 11. Alternatively, the first radiator 11 may extend in a straight line, or in a curved line, or in a bending line. The first radiator 11 may be a line with a uniform width on the extending track, or may be a bar with a gradual width change and a widening area, etc.

The form of the first radiator 11 is not particularly limited in the present application. Optionally, the first radiator 11 includes, but is not limited to, a metal frame 320, a metal frame embedded in the plastic frame 320, a metal radiator located in or on the frame 320, a flexible circuit board antenna formed on a flexible circuit board (Flexible Printed Circuit board, FPC), a laser direct Structuring antenna formed by Laser Direct Structuring (LDS), a printed direct Structuring antenna formed by Printing Direct Structuring (PDS) PRINT DIRECT, a conductive patch antenna (e.g., a metal bracket antenna), and the like. In this embodiment, the first radiator 11 is taken as a part of the metal frame 320 of the electronic device 1000 as an example. The present application is not limited to a specific location where the first radiator 11 is disposed on the bezel 320.

The free end in the present application refers to an end that is disconnected from other conductive parts of the frame 320 by an insulation break and is not electrically connected to the reference floor. In order to ensure structural strength of the frame 320 of the electronic device 1000, the insulating material is filled in the insulating break.

The grounding point in the present application is a location on the radiating stub 10 where the reference floor 500 is electrically connected, wherein the electrical connection means includes, but is not limited to, a direct electrical connection or an indirect electrical connection. For example, the first grounding point a is grounded back through a grounding spring. For another example, the first grounding point a of the first radiator 11 is interconnected with a portion of the reference floor 500 as a whole, i.e. by means of a physical ground return.

The radiation branch 10 further comprises a second radiator 12. The material, shape, form, etc. of the second radiator 12 can be referred to as the material, shape, form, etc. of the first radiator 11.

Referring to fig. 4, the second radiator 12 includes a second free end D, a connection point E, and a second ground point F. Optionally, the second ground point F and the second free end D are two ends of the second radiator 12. The connection point E is located between the second ground point F and the second free end D.

A coupling gap is formed between the first free end C and the second free end D.

Optionally, the coupling slit is an insulation break slit. The first radiator 11 and the second radiator 12 can be capacitively coupled through a coupling gap. In one of the angles, the first radiator 11 and the second radiator 12 can be regarded as two parts formed by the frame 320 being partitioned by the coupling slit. The "capacitive coupling" refers to that the coupling gap between the first radiator 11 and the second radiator 12 generates an electric field, the signal of the first radiator 11 can be transmitted to the second radiator 12 through the electric field, and the signal of the second radiator 12 can be transmitted to the first radiator 11 through the electric field, so that the first radiator 11 and the second radiator 12 can realize electric signal conduction even in a state of not being directly electrically connected.

Referring to fig. 4, one end of the first tuning circuit 20 is electrically connected to the connection point E, and the other end of the first tuning circuit 20 is grounded. The first tuning circuit 20 includes at least one of capacitance, inductance, resistance. The first tuning circuit 20 is arranged to tune the frequency band supported by the resonance mode on said second radiator 12.

Referring to fig. 4, the first signal source 30 is electrically connected to the first feeding point B.

The first signal source 30 includes, but is not limited to, a radio frequency transceiver chip, etc. The first signal source 30 provides a radio frequency excitation current to excite a local or whole radiation branch 10 to generate a resonance current, so as to form a resonance mode, and support a frequency band corresponding to the resonance current.

In the embodiment of the present application, the first signal source 30 is disposed on the motherboard 600. The electrical connection between the first signal source 30 and the first feeding point B includes, but is not limited to, indirect connection via a coaxial line, a conductive spring, etc. Specifically, the first signal source 30 is electrically connected to the first feeding point B through a feeding spring (conductive spring) disposed on the motherboard 600.

In this embodiment, the first signal source 30 is configured to provide a first excitation signal in a first frequency band. Optionally, the radio frequency excitation signal of the first frequency band is part of the radio frequency excitation signal provided by the first signal source 30.

Referring to fig. 5, the first excitation signal is used to excite the radiating branch 10 to form a first resonant mode. The first resonance mode is a 1/4 wavelength mode which resonates between the first grounding point A and the first free end C and supports a first frequency band. In other words, the main resonance current of the first resonance mode is distributed between the first ground point a and the first free end C, i.e. over the entire branch of the first radiator 11. The electrical length of the first radiator 11 is close to or is 1/4 wavelength of the center frequency point of the first frequency band, so as to excite the first grounding point A and the first free end C to form a 1/4 wavelength mode supporting the first frequency band.

Wherein the current distribution of the primary resonant current of the first resonant mode comprises: from the first ground point a to the first free end C. Due to the periodicity of the current, at other moments the current flow may also be such that the first free end C flows to the first ground point a.

The electrical length described in the present application may satisfy the following formula:

where L is the physical length, a is the transmission time of the electrical or electromagnetic signal in the medium, and b is the transmission time in the free scene.

The antenna form of the aforementioned first radiator 11 is an IFA antenna form. The first resonant mode is close to or is a 1/4 wavelength mode of the first frequency band. The 1/4 wavelength mode is the ground mode of the IFA antenna and has a relatively high efficiency to ensure that the first frequency band supported by the first resonant mode has a relatively high efficiency.

Wherein the first frequency band includes, but is not limited to, at least one of LB frequency band [703MHz-960MHz ], MHB frequency band [1710MHz-2690MHz ], UHB frequency band (greater than 3 GHz), wi-Fi frequency band, GPS frequency band, etc.

Referring to fig. 6, the first excitation signal is further used to excite the radiating branch 10 to form a second resonant mode when the first tuning circuit 20 is configured to be electrically connected to the connection point E. The second resonance mode is a 1/2 wavelength mode which resonates between the connection point E and the second grounding point F and supports a second frequency band. The resonant current of the second resonant mode flows through the first tuning circuit 20 to ground.

In other words, the main resonance current of the second resonance mode is distributed between the connection point E and the second ground point F. The sum of the electrical length between the connection point E and the second ground point F and the electrical length of the first tuning circuit 20 is close to or is 1/2 wavelength of the center frequency point of the second frequency band, so as to excite the connection point E and the second ground point F to form a 1/2 wavelength mode supporting the second frequency band.

The main resonance current of the second resonance mode forms a first current zero N1 between the connection point E and the second ground point F. The current zero point is the minimum point of current intensity, and is also the position with the reverse current direction, namely the current directions at the two sides of the current zero point are opposite.

Wherein the current distribution of the primary resonant current of the second resonant mode comprises: a portion of the resonant current flows from the first current zero N1 to the connection point E and is grounded via the first tuning circuit 20; another part of the resonance current flows from the first current zero N1 to the ground below the second ground point F. Due to the periodicity of the current, at other moments the current distribution may also be: a portion of the resonant current flows from the connection point E to the first current zero N1 through the first tuning circuit 20; another part of the resonance current flows from the second ground point F to the first current zero point N1.

Wherein the second frequency band includes, but is not limited to, at least one of LB frequency band [703MHz-960MHz ], MHB frequency band [1710MHz-2690MHz ], UHB frequency band (greater than 3 GHz), wi-Fi frequency band, GPS frequency band, etc.

Optionally, the first frequency band and the second frequency band belong to an MHB frequency band. In this embodiment, by designing the radiating branch 10 and the tuning circuit, a plurality of resonant modes are formed on the radiating branch 10 to support more frequency bands and support a wider bandwidth frequency band.

The second radiator 12 is used as a parasitic branch of the first radiator 11, the first resonant mode is a main resonant mode, and the second resonant mode is an auxiliary mode of the first resonant mode. In other words, the center frequency point of the second frequency band is close to the center frequency point of the first frequency band. Optionally, the second frequency band and the first frequency band form a continuous frequency band to increase the bandwidth of the first frequency band.

Further, the center frequency point of the second frequency band is larger than the center frequency point of the first frequency band. The center frequency point of the second frequency band is arranged on the high frequency side of the center frequency point of the first frequency band, so that the efficiency pit behind the second frequency band avoids the position of the first frequency band, and efficiency improvement is formed at the position of the first frequency band before the efficiency pit, so that the efficiency of the first frequency band is improved.

In the embodiment of the application, the first resonant mode is formed on the first radiator 11, and the second resonant mode is formed on the second radiator 12, wherein the bandwidth and efficiency of the first frequency band are increased by increasing the radiation caliber.

Optionally, the antenna assembly 100 further comprises a first matching circuit M1. The first matching circuit M1 is electrically connected between the first signal source 30 and the first feeding point B. The first matching circuit M1 includes at least one of a capacitance and an inductance, and the first matching circuit M1 facilitates the first signal source 30 to excite the first resonant mode and the second resonant mode in the radiation branch 10 by adjusting the impedance matching between the port of the first signal source 30 and the port of the radiation branch 10. The application is described below with reference to the first matching circuit.

According to the antenna assembly 100 and the electronic device 1000 provided by the embodiments of the present application, the radiating branch 10 includes a first radiator 11 and a second radiator 12, the first radiator 11 includes a first grounding point a, a first feeding point B and a first free end C, the second radiator 12 includes a second free end D, a connection point E and a second grounding point F, a coupling gap is formed between the first free end C and the second free end D, one end of the first tuning circuit 20 is electrically connected to the connection point E, the other end of the first tuning circuit 20 is grounded, the first signal source 30 is electrically connected to the first feeding point B, the first signal source 30 is configured to provide a first excitation signal of a first frequency band, the first excitation signal is used to excite the radiating branch 10 to form a first resonant mode, the first resonant mode is a 1/4 wavelength mode between the first grounding point a and the first free end C and supporting the first frequency band, the first excitation signal is also used to form a second resonant mode when the first tuning circuit 20 is electrically conducted with the connection point E, the second resonant mode is a second resonant mode formed between the connection point E and the second tuning circuit F and supporting the second frequency band, the second resonant mode is more than the first resonant mode and the first frequency band is formed by the second resonant mode and the second frequency band is more than the first resonant mode and the first frequency band is more than the first resonant mode and the second frequency band is more than the first frequency band and the first resonant mode is more than the first frequency band and the second resonant mode is designed.

Optionally, referring to fig. 7, the first excitation signal is further configured to excite the radiation branch 10 to form a third resonant mode. The third resonance mode is a 3/4 wavelength mode which resonates between the first feeding point B and the second grounding point F and supports a third frequency band. In other words, the main resonance current of the third resonance mode is distributed between the first feeding point B and the second ground point F. The electrical length between the first feeding point B and the second grounding point F is close to or is 3/4 wavelength of the central frequency point of the third frequency band, so that a 3/4 wavelength mode supporting the third frequency band is formed between the first feeding point B and the second grounding point F.

The main resonance current of the third resonance mode forms a second current zero N2 between the first feeding point B and the second ground point F.

Wherein the current distribution of the primary resonance current of the third resonance mode comprises: a part of the resonance current flows from the reference floor 500 to the second current zero point N2 through the first feeding point B, the current mode of the part of the resonance current approaches to the 1/2 wavelength current mode, and the intensity of the resonance current of the part is increased and then decreased; another part of the resonance current flows from the second grounding point F to the second current zero point N2, the current mode of the resonance current of this part approaches to the 1/4 wavelength current mode, and the current intensity gradually decreases from the second grounding point F to the second current zero point N2. Due to the periodicity of the current, at other moments the current flow may also be such that the first free end C flows to the first ground point a.

Optionally, the third frequency band, the second frequency band and the first frequency band are all middle-high frequency bands (MHB frequency bands). And the center frequency point of the third frequency band is larger than the center frequency point of the second frequency band. Namely, the first frequency band, the second frequency band and the third frequency band are three different frequency bands.

According to the antenna assembly 100 provided by the embodiment of the application, through the design of the radiation branch 10 and the tuning circuit, the first resonant mode, the second resonant mode and the third resonant mode are formed on the radiation branch 10 at the same time, so that the antenna assembly can work in two or three working frequency bands at the same time, and Carrier Aggregation (CA) is realized, for example, the performance of a CA state of B3+B41 (2500 MHz-2690 MHz) is better, and the like.

Referring to fig. 8, the first excitation signal is further used to excite the radiating branch 10 to form a fourth resonant mode. The fourth resonance mode is a 1-time wavelength mode which resonates between the first grounding point A and the second grounding point F and supports a fourth frequency band.

In other words, the main resonance current of the fourth resonance mode is distributed between the first ground point a and the second ground point F. The electrical length between the first grounding point A and the second grounding point F is close to or 1 time of the wavelength of the central frequency point of the fourth frequency band, so that a 1 time wavelength mode supporting the fourth frequency band is formed between the first grounding point A and the second grounding point F.

The main resonance current of the fourth resonance mode forms a fourth current zero O4 and a fifth current zero O5 between the first ground point a and the second ground point F. The current zero point is the minimum point of current intensity, and is also the position with the reverse current direction, namely the current directions at the two sides of the current zero point are opposite.

Wherein the current distribution of the primary resonance current of the fourth resonance mode comprises: a part of resonance current flows from the fourth current zero point O4 to the first grounding point A, and is grounded under the first grounding point A, and the current mode of the part is a 1/4 wavelength current mode; another part of the resonance current flows from the fourth current zero point O4 to the fifth current zero point O5, and the current mode of the part is a 1/2 wavelength current mode; a further part of the resonance current flows from the second ground point F to the fifth current zero O5, the current mode of this part being 1/4 wavelength current mode, below the second ground point F. Due to the periodicity of the current, at other moments the direction of the current may also be reversed.

Wherein the fourth frequency band includes, but is not limited to, at least one of LB frequency band [703MHz-960MHz ], MHB frequency band [1710MHz-2690MHz ], UHB frequency band (greater than 3 GHz), wi-Fi frequency band, GPS frequency band, etc.

Optionally, the fourth frequency band is a middle-high frequency band. In this embodiment, by designing the radiating branch 10 and the tuning circuit, a plurality of resonant modes are formed on the radiating branch 10 to support more frequency bands and support a wider bandwidth frequency band.

The second radiator 12 is used as a parasitic branch of the first radiator 11, the third resonant mode is a main resonant mode, and the fourth resonant mode is an auxiliary mode of the third resonant mode. In other words, the center frequency point of the fourth frequency band is close to the center frequency point of the third frequency band. Optionally, the fourth frequency band and the third frequency band form a continuous frequency band to increase the bandwidth of the third frequency band.

Further, the center frequency point of the fourth frequency band is larger than the center frequency point of the third frequency band. The center frequency point of the fourth frequency band is arranged on the high-frequency side of the center frequency point of the third frequency band, so that the efficiency pit behind the fourth frequency band avoids the position of the third frequency band, efficiency improvement is formed in the position of the third frequency band before the efficiency pit, and the efficiency of the third frequency band is improved.

In the embodiment of the application, the third resonant mode and the fourth resonant mode are formed on the first radiator 11 and the second radiator 12, wherein the bandwidth and the efficiency of the third frequency band are increased by increasing the radiation caliber.

Referring to fig. 9, fig. 9 is an S-parameter curve of the first resonant mode, the second resonant mode, the third resonant mode, and the fourth resonant mode. In fig. 9, point 1 is the resonance point of the first resonance mode, point 2 is the resonance point of the second resonance mode, point 3 is the resonance point of the third resonance mode, and point 4 is the resonance point of the fourth resonance mode. The second frequency band of the second resonance mode and the first frequency band of the first resonance mode form a continuous frequency band. The third frequency band of the third resonant mode and the fourth frequency band of the fourth resonant mode form a continuous frequency band.

Referring to fig. 10, fig. 10 is a graph comparing antenna efficiency with or without the second and fourth resonant modes. The curve a1 is the radiation efficiency in which the second resonance mode and the fourth resonance mode are not formed. Curve a2 is the radiation efficiency when the first resonance mode is assisted by enhancement of the second resonance mode and the third resonance mode is assisted by enhancement of the fourth resonance mode. Curve b1 is the system efficiency without forming the second and fourth resonance modes. Curve b2 is the system efficiency for the third and fourth resonance mode enhancement assistance when the first and second resonance modes are also assisted.

The second resonant mode contributes about 0.5dB to the radiation efficiency of the first resonant mode. The fourth resonant mode contributes about 0.5dB to the radiation efficiency of the second resonant mode, which also improves the antenna bandwidth to some extent.

Optionally, referring to fig. 11, the first matching circuit M1 includes a first switch K1 and a plurality of first tuning branches T1. The fixed end of the first switch K1 is electrically connected between the first feeding point B and the first signal source 30. Each selection terminal of the first switch K1 is electrically connected to one terminal of the first tuning branch T1. The impedance of each of said first tuning branches T1 is different. The other end of the first tuning branch T1 is grounded or electrically connected to the first signal source 30. The fixed end of the first switch K1 is configured to conduct different first tuning branches T1 to switch sub-bands of the medium-high frequency band.

In this embodiment, the first switch K1 functions in a manner similar to a multiple pole, multiple throw switch. In other words, the first switch K1 has a plurality of selection terminals. The fixed end of the first switch K1 may be independently turned on with each selection end.

Each selection end is electrically connected with one first tuning branch T1, and further, the fixed end of the first switch K1 is electrically connected with the corresponding selection end to change the impedance of the first matching circuit M1, so that the size of at least one of the first frequency band, the second frequency band and the fourth frequency band is tuned.

Optionally, the first switch K1 is configured to be disconnected from the plurality of first tuning branches T1, that is, the fixed end of the first switch K1 is disconnected from all the selection ends, which may be the initial state of the first switch K1. In the first state of the first switch K1 in this embodiment, the first frequency band covers at least the B3 frequency band, and the antenna assembly 100 can operate in the B3 frequency band. The third frequency band at least covers the B41 frequency band, and at this time, the antenna assembly 100 can work in the b3+b41 frequency band at the same time, so that the CA state of b3+b41 has higher performance.

Optionally, referring to fig. 12, a plurality of the first tuning branches T1 includes a first resistor R1. One end of the first resistor R1 is electrically connected to the fourth selection end of the first switch K1, and the other end of the first resistor R1 is electrically connected to the first signal source 30. Further, a matching branch is further disposed between the first signal source 30 and the fixed end of the first switch K1.

The fixed end of the first switch K1 is configured to be conductive to the first resistor R1, that is, the fixed end of the first switch K1 is conductive to the fourth selection end of the first switch K1. In the second state of the first switch K1 in this embodiment, the first frequency band covers at least the B1 frequency band, and the antenna assembly 100 can operate in the B1 frequency band. For example, the first resistor R1 is 0Ω.

Optionally, referring to fig. 12, the plurality of first tuning branches T1 further includes a first inductance L1. The first inductor L1 is electrically connected between the second selection terminal of the first switch K1 and the reference ground. The fixed end of the first switch K1 is configured to be conductive to the first inductor L1, that is, the fixed end of the first switch K1 is conductive to the second selection end of the first switch K1. In the third state of the first switch K1 in this embodiment, the first frequency band covers at least the B2 frequency band. The antenna assembly 100 may now operate in the B2 band. For example, the first inductance L1 is 3.9nH.

The above-mentioned switching of the first switch K1 in different operating states can switch the frequency band supported by the switchable first resonant mode among the B3 frequency band, the B1 frequency band, and the B2 frequency band, so as to realize that the antenna assembly 100 can support a wider range in the MHB frequency band.

Optionally, referring to fig. 12, a plurality of the first tuning branches T1 includes a first capacitor C1. The first capacitor C1 is electrically connected between the first selection terminal of the first switch K1 and the reference ground. The fixed end of the first switch K1 is configured to be conductive to the first capacitor C1, that is, the fixed end of the first switch K1 is conductive to the first selection end of the first switch K1. In the fourth state of the first switch K1 in this embodiment, the third frequency band covers at least the B41 frequency band, and the antenna assembly 100 can operate in the B41 frequency band. For example, the capacitance of the first capacitor C1 is 0.3pF.

Optionally, referring to fig. 12, a plurality of the first tuning branches T1 includes a second capacitor C2. The second capacitor C2 is electrically connected between the third selection terminal of the first switch K1 and the reference ground. The capacitance value of the second capacitor C2 is larger than the capacitance value of the first capacitor C1. The fixed end of the first switch K1 is configured to be conductive to the second capacitor C2, that is, the fixed end of the first switch K1 is conductive to the third selection end of the first switch K1. In the fifth state of the first switch K1 in the present embodiment, the third frequency band covers at least the B40 frequency band, and the antenna assembly 100 can operate in the B40 frequency band. For example, the capacitance of the second capacitor C2 is 1.0pF.

The above-mentioned first switch K1 is in different working states, the frequency band supported by the switchable third resonant mode is switched between the B40 frequency band and the B41 frequency band, and the frequency band supported by the first resonant mode is combined with the switching between the B3 frequency band, the B1 frequency band and the B2 frequency band, so that the antenna assembly 100 can be covered in the MHB frequency band.

Optionally, referring to fig. 12, the first matching circuit M1 further includes a first matching branch M11. The first matching branch M11 is used to tune the impedance of the radiation branch 10. The first matching branch M11 comprises a third capacitance C3. One end of the third capacitor C3 is electrically connected to the fixed end of the first switch K1, and the other end of the third capacitor C3 is electrically connected to the first signal source 30. For example, the capacitance of the third capacitor C3 is 1.0pF.

Still alternatively, referring to fig. 12, the first matching branch M11 includes a second inductor L2. One end of the second inductor L2 is electrically connected to the fixed end of the first switch K1, and the other end of the second inductor L2 is grounded. The third capacitor C3 and the second inductor L2 are both used for tuning the impedance of the radiation branch 10, so as to realize impedance matching. For example, the inductance value of the second inductor L2 is 4.3nH.

First signal source 30 and first radiator 11 form an MHB antenna. The initial state of the MHB antenna provided by the embodiment of the application consists of 4 resonance modes. The first resonance mode and the third resonance mode are main modes, and the second resonance mode and the fourth resonance mode are auxiliary enhancement modes.

The initial state of the first resonance mode can be switched to a B2 frequency band or a B1 frequency band in the B3 frequency band through a first switch K1; the initial state of the third resonance mode is in the B41 frequency band, and the first switch K1 can be switched to the B40 frequency band, so that the coverage of all frequency bands of the MHB is realized.

Referring to fig. 13, fig. 13 is an S-parameter curve of the first, second, third and fourth resonant modes during switching. The curve a1 is an S-curve in which the fixed end of the first switch K1 is conducted with the third selection end. The third resonant mode supports the B41 band. Curve a2 is an S-curve of the first switch K1 in the off-state. The first resonance mode supports the B3 band and the third resonance mode supports the B41 band. The curve a3 is an S-curve in which the fixed end of the first switch K1 is turned on to the second selection end of the first switch K1. The first resonance mode supports the B2 band and the third resonance mode supports the B41 band. The curve a4 is an S-curve in which the fixed end of the first switch K1 is turned on to the fourth selection end of the first switch K1. The first resonant mode supports the B1 band. The MHB antenna uses a plurality of modes, the state switched by the first switch K1 can cover 2 or more frequency bands, and the state switched by the first switch K1 can cover more frequency bands, so that the efficiency of the CA state is improved.

Referring to fig. 14, fig. 14 is a schematic diagram illustrating a current distribution of a first resonant mode when the antenna assembly 100 is disposed on the first side 323 of the electronic device 1000. It is known that the 1/4 lambda resonance generated by the AC branch, the current, covers the B3 band.

Referring to fig. 15, fig. 15 is a schematic diagram illustrating a current distribution of the second resonant mode when the antenna assembly 100 is disposed on the first side 323 of the electronic device 1000. It is known that the 1/2 lambda resonance generated by the EF branch enhances the efficiency and bandwidth of the B3 band, which requires switching the second switch K2 at point E to a capacitance of 1.2pF to ground.

Referring to fig. 16, fig. 16 is a schematic diagram illustrating a current distribution of a third resonant mode when the antenna assembly 100 is disposed on the first side 323 of the electronic device 1000. It is known that the 3/4 lambda resonance generated by the BF branch covers the B41 band.

Referring to fig. 17, fig. 17 is a schematic diagram illustrating a current distribution of a fourth resonant mode when the antenna assembly 100 is disposed on the first side 323 of the electronic device 1000. It can be seen that the lambda resonance generated by the AF dendrite enhances the B41 band efficiency and bandwidth.

Optionally, referring to fig. 18, the second radiator 12 further includes a second feeding point E1. The antenna assembly 100 further includes a second signal source 40. The second signal source 40 is electrically connected to the second feeding point E1. Wherein the second signal source 40 includes, but is not limited to, a radio frequency transceiver chip. Further, the antenna assembly 100 further includes a second matching circuit M2, and the second matching circuit M2 is electrically connected between the second signal source 40 and the second feeding point E1.

Referring to fig. 19, the second signal source 40 is configured to excite the second radiator 12 to form a fifth resonant mode supporting a fifth frequency band. The fifth resonant mode is a 1/4 wavelength mode which resonates between the second feeding point E1 and the second free end D and supports a fifth frequency band.

In other words, the main resonance current of the fifth resonance mode is distributed between the second feeding point E1 and the second free end D. The electrical length between the second feeding point E1 and the second free end D is close to or is 1/4 wavelength of the center frequency point of the fifth frequency band, so as to excite the second feeding point E1 and the second free end D to form a 1/4 wavelength mode supporting the fifth frequency band.

Wherein the current distribution of the main resonance current of the fifth resonance mode comprises: from the second feed point E1 to the second free end D. Due to the periodicity of the current, at other moments the direction of the current may also be reversed.

Wherein the fifth frequency band includes, but is not limited to, at least one of LB frequency band [703MHz-960MHz ], MHB frequency band [1710MHz-2690MHz ], UHB frequency band (greater than 3 GHz), wi-Fi frequency band, GPS frequency band, etc.

Optionally, the fifth frequency band is an N78 frequency band (3400 MHz-3600 MHz). In this embodiment, by designing the radiating branch 10 and the tuning circuit, a plurality of resonant modes are formed on the radiating branch 10 to support more frequency bands and support a wider bandwidth frequency band.

Referring to fig. 20, the antenna assembly 100 further includes a third signal source 50. The third signal source 50 is electrically connected to the second feeding point E1. Wherein the second signal source 40 includes, but is not limited to, a radio frequency transceiver chip. Further, the antenna assembly 100 further includes a third matching circuit M3, and the third matching circuit M3 is electrically connected between the second signal source 40 and the second feeding point E1.

Referring to fig. 21, the third signal source 50 is configured to excite the second radiator 12 to form a sixth resonant mode supporting a sixth frequency band.

The sixth resonant mode is a 1/4 wavelength mode that resonates between the second ground point F and the second free end D and supports a sixth frequency band.

In other words, the main resonance current of the sixth resonance mode is distributed between the second ground point F and the second free end D. The electrical length between the second grounding point F and the second free end D is close to or is 1/4 wavelength of the center frequency point of the sixth frequency band, so that a 1/4 wavelength mode supporting the sixth frequency band is formed between the second grounding point F and the second free end D.

Wherein the current distribution of the main resonance current of the sixth resonance mode comprises: from the second ground point F to the second free end D. Due to the periodicity of the current, at other moments the direction of the current may also be reversed.

Wherein the sixth frequency band includes, but is not limited to, at least one of LB frequency band [703MHz-960MHz ], MHB frequency band [1710MHz-2690MHz ], UHB frequency band (greater than 3 GHz), wi-Fi frequency band, GPS frequency band, etc.

Optionally, the sixth frequency band is an LB frequency band. In this embodiment, by designing the radiating branch 10 and the tuning circuit, a plurality of resonant modes are formed on the radiating branch 10 to support more frequency bands and support a wider bandwidth frequency band. In addition, by commonly connecting the second signal source 40 and the third signal source 50 to the second radiator 12, the second radiator 12 is multiplexed, reducing the size of the antenna assembly 100.

It can be appreciated that the first matching circuit M1, the second matching circuit M2, and the third matching circuit M3 can realize isolation between three signal sources. Specific examples are as follows.

Referring to fig. 22, for the first matching circuit M1 of the first radiator 11, the first matching circuit M1 of the antenna assembly 100 further includes a first band-stop circuit D1. The first band-stop circuit D1 is electrically connected between the first feeding point B and the first signal source 30. The first band-stop circuit D1 is a circuit having a high impedance state for the frequency band supported by the fifth resonance mode and a low impedance state for the middle-high frequency band. The first band reject circuit D1 is configured to reject the fifth frequency band (e.g., the N78 frequency band) supported by the fifth resonant mode and pass the MHB frequency band supported by the first to fourth resonant modes, thereby ensuring that the excitation signal provided by the first signal source 30 is able to form the first to fourth resonant modes by radiating the branch 10 and cover the MHB frequency band. And meanwhile, the excitation signal of the N78 frequency band provided by the second signal source 40 is prevented from interfering with the signal receiving and transmitting of the first signal source 30.

For example, referring to fig. 22, the first band-stop circuit D1 includes a first sub-inductor L01. The inductance value of the first sub-inductance L01 is 3.9nH.

Referring to fig. 22, for the first matching circuit M1 of the first radiator 11, the first matching circuit M1 of the antenna assembly 100 further includes a first pass circuit G1. One end of the first band-pass circuit G1 is electrically connected between the first band-stop circuit D1 and the first signal source 30. The other end of the first band-pass circuit G1 is grounded. The first pass circuit G1 is in a low impedance state for the frequency band supported by the sixth resonant mode. And a circuit in a high impedance state for the middle and high frequency bands. The first pass circuit G1 is configured to pass the sixth frequency band (for example, LB frequency band) supported by the sixth resonant mode and the MHB frequency band supported by the first to fourth resonant modes, thereby ensuring that the excitation signal provided by the first signal source 30 can form the first to fourth resonant modes through the radiating branch 10 and cover the MHB frequency band. While also avoiding interference of the excitation signal of the LB frequency band provided by the third signal source 50 with the signal transceiving of the first signal source 30.

For example, the first pass circuit G1 is the aforementioned second inductor L2. The aforementioned second inductor L2 can achieve the effects of impedance matching, and also can pass the sixth frequency band (for example, LB frequency band) supported by the sixth resonance mode to the ground, and the MHB frequency band supported by the first resonance mode to the fourth resonance mode.

Optionally, referring to fig. 23, the second radiator 12 further includes a second feeding point E1. The antenna assembly 100 further includes a second signal source 40. The second signal source 40 is electrically connected to the second feeding point E1. Wherein the second signal source 40 includes, but is not limited to, a radio frequency transceiver chip. Further, the antenna assembly 100 further includes a second matching circuit M2, and the second matching circuit M2 is electrically connected between the second signal source 40 and the second feeding point E1. The second signal source 40 is configured to excite the second radiator 12 to form a fifth resonant mode supporting a fifth frequency band. The fifth resonant mode is a 1/4 wavelength mode which resonates between the second feeding point E1 and the second free end D and supports a fifth frequency band. The main resonance current of the fifth resonance mode is distributed between the second feeding point E1 and the second free end D. The electrical length between the second feeding point E1 and the second free end D is close to or is 1/4 wavelength of the center frequency point of the fifth frequency band, so as to excite the second feeding point E1 and the second free end D to form a 1/4 wavelength mode supporting the fifth frequency band.

Referring to fig. 23, the antenna assembly 100 further includes a first band-stop circuit D1. The first band-stop circuit D1 is electrically connected between the first feeding point B and the first signal source 30. The first band-stop circuit D1 is a circuit having a high impedance state for the frequency band supported by the fifth resonance mode and a low impedance state for the middle-high frequency band.

In this embodiment, the first radiator 11 is connected to the first signal source 30, and the second radiator 12 is connected to the second signal source 40, where the first band-stop circuit D1 is configured to prevent the fifth frequency band (for example, the N78 frequency band) supported by the fifth resonant mode from passing through, and to ensure that the excitation signal provided by the first signal source 30 passes through the MHB frequency bands supported by the first to fourth resonant modes, and the first to fourth resonant modes can be formed by the radiating branches 10, and to cover the MHB frequency bands. And meanwhile, the excitation signal of the N78 frequency band provided by the second signal source 40 is prevented from interfering with the signal receiving and transmitting of the first signal source 30. The antenna assembly 100 of the present embodiment can support both MHB band and N78 band.

Referring to fig. 24, the antenna assembly 100 further includes a third signal source 50. The third signal source 50 is electrically connected to the second feeding point E1. Wherein the second signal source 40 includes, but is not limited to, a radio frequency transceiver chip. Further, the antenna assembly 100 further includes a third matching circuit M3, and the third matching circuit M3 is electrically connected between the second signal source 40 and the second feeding point E1.

The third signal source 50 is configured to excite the second radiator 12 to form a sixth resonant mode supporting a sixth frequency band. The sixth resonant mode is a 1/4 wavelength mode that resonates between the second ground point F and the second free end D and supports a sixth frequency band. The primary resonance current of the sixth resonance mode is distributed between the second ground point F and the second free end D. The electrical length between the second grounding point F and the second free end D is close to or is 1/4 wavelength of the center frequency point of the sixth frequency band, so that a 1/4 wavelength mode supporting the sixth frequency band is formed between the second grounding point F and the second free end D.

Referring to fig. 24, the antenna assembly 100 further includes a first band-pass circuit G1. One end of the first band-pass circuit G1 is electrically connected between the first band-stop circuit D1 and the first signal source 30. The other end of the first band-pass circuit G1 is grounded. The first pass circuit G1 is a circuit having a low impedance state for the frequency band supported by the sixth resonance mode and a high impedance state for the middle-high frequency band.

In this embodiment, the first radiator 11 is connected to the first signal source 30, and the second radiator 12 is connected to the second signal source 40 and the third signal source 50, where the first band-pass circuit G1 is configured to make the sixth frequency band (for example, the LB frequency band) supported by the sixth resonant mode pass through the MHB frequency band supported by the first to fourth resonant modes, so as to ensure that the excitation signal provided by the first signal source 30 can form the first to fourth resonant modes through the radiating branch 10 and cover the MHB frequency band. While also avoiding interference of the excitation signal of the LB frequency band provided by the third signal source 50 with the signal transceiving of the first signal source 30. The antenna assembly 100 of the present embodiment may support both MHB band + N78 band + LB band.

Of course, in other embodiments, the antenna assembly 100 includes the first radiator 11 connected to the first signal source 30 and the second radiator 12 connected to the third signal source 50, and the antenna assembly 100 of this embodiment can support the MHB band+lb band at the same time.

Optionally, the fifth frequency band is an N78 frequency band. The sixth frequency band is a low frequency band. The antenna assembly 100 can support both MHB band + n78 band + LB band, and the size of the antenna assembly 100 is relatively small.

Referring to fig. 25, for the second matching circuit M2 on the second radiator 12 side, the second matching circuit M2 of the antenna assembly 100 further includes a second band-stop circuit D2 and a third band-stop circuit D3. The second bandstop circuit D2 is electrically connected between the second feeding point E1 and the second signal source 40. The third bandstop circuit D3 is electrically connected between the second feeding point E1 and the second signal source 40. The second band-stop circuit D2 may be disposed between the second feeding point E1 and the third band-stop circuit D3, or the third band-stop circuit D3 may be disposed between the second feeding point E1 and the second band-stop circuit D2.

Further, referring to fig. 25, the second matching circuit M2 further includes a second matching branch M21, and the second matching branch M21 is configured to tune the impedance of the second radiator 12. The second band-stop circuit D2 and the third band-stop circuit D3 are both disposed between the second signal source 40 and the second feeding point E1.

The second band reject circuit D2 is in a low impedance state for the fifth frequency band (e.g., N78 frequency band) and in a high impedance state for the sixth frequency band (LB frequency band). The second band reject circuit D2 is configured to pass the sixth frequency band (for example, LB frequency band) supported by the sixth resonant mode, and pass the fifth frequency band (for example, N78 frequency band) supported by the fifth resonant mode, so as to ensure that the excitation signal provided by the second signal source 40 electrically connected to the same feeding point (the second feeding point E1) can form the fifth resonant mode by the second radiator 12 and cover the N78 frequency band. While also avoiding interference of the excitation signal of the LB frequency band provided by the third signal source 50 with the signal transceiving of the second signal source 40.

Specifically, referring to fig. 26, the second band-stop circuit D2 includes a second sub-inductor L02 and a first sub-capacitor C01, where the second sub-inductor L02 and the first sub-capacitor C01 form a parallel circuit. For example, the inductance value of the second sub-inductor L02 is 36nH. The capacitance value of the first sub-capacitor C01 is 1.0pF.

The third band reject circuit D3 is in a low impedance state for the fifth frequency band (e.g., the N78 frequency band) and in a high impedance state for the MHB frequency band (e.g., the B41 frequency band). The third band-stop circuit D3 is configured to prevent the MHB frequency band (e.g., B41 frequency band) supported by the first to fourth resonance modes (e.g., the third resonance mode) from passing therethrough, and to allow the fifth frequency band (e.g., N78 frequency band) supported by the fifth resonance mode to pass therethrough, so as to ensure that the excitation signal provided by the second signal source 40 can form the fifth resonance mode through the second radiator 12 and cover the N78 frequency band. While also avoiding interference of the MHB band excitation signal provided by the first signal source 30 with the signal transceiving of the second signal source 40.

Optionally, referring to fig. 26, the third band-stop circuit D3 includes a third sub-inductor L03 and a second sub-capacitor C02, where the third sub-inductor L03 and the second sub-capacitor C02 form a parallel circuit. For example, the inductance value of the third sub-inductor L03 is 3.0nH. The capacitance value of the second sub-capacitor C02 is 1.2pF.

Optionally, referring to fig. 26, the second matching branch M21 includes a fourth sub-inductor L04, one end of the fourth sub-inductor L04 is electrically connected to one end of the third band-stop circuit D3 away from the second feeding point E1, and the other end of the fourth sub-inductor L04 is electrically connected to the second signal source 40. For example, the inductance value of the fourth sub-inductance L04 is 3.0nH.

Optionally, referring to fig. 26, the second matching branch M21 includes a third sub-capacitor C03, one end of the third sub-capacitor C03 is electrically connected to the other end of the fourth sub-inductor L04, and the other end of the third sub-capacitor C03 is grounded. For example, the inductance value of the third sub-capacitor C03 is 1.0pF.

Referring to fig. 25, for the third matching circuit M3 on the second radiator 12 side, the third matching circuit M3 of the antenna assembly 100 further includes a fourth band-stop circuit D4 and a second band-pass circuit G2.

The fourth bandstop circuit D4 is electrically connected between the second feeding point E1 and the third signal source 50. The fourth band-stop circuit D4 is in a low impedance state for the sixth frequency band and in a high impedance state for the fifth frequency band.

The fourth band-stop circuit D4 is configured to prevent the fifth frequency band (for example, the N78 frequency band) supported by the fifth resonant mode from passing therethrough, and to pass the sixth frequency band (for example, the LB frequency band) supported by the sixth resonant mode, so as to ensure that the excitation signal provided by the third signal source 50 electrically connected to the same feeding point (the second feeding point E1) can form the sixth resonant mode through the second radiator 12 and cover the LB frequency band. And meanwhile, the excitation signal of the N78 frequency band provided by the second signal source 40 is prevented from interfering with the signal receiving and transmitting of the third signal source 50.

Specifically, referring to fig. 26, the fourth band-stop circuit D4 includes a fifth sub-inductor L05 and a fourth sub-capacitor C04, and the fifth sub-inductor L05 and the fourth sub-capacitor C04 form a parallel circuit. For example, the inductance value of the fifth sub-inductance L05 is 1.5nH. The capacitance value of the fourth sub-capacitor C04 is 1.2pF.

One end of the second band-pass circuit G2 is electrically connected between the fourth band-stop circuit D4 and the third signal source 50, and the other end of the second band-pass circuit G2 is grounded. The second band-pass circuit G2 is in a low impedance state for the third frequency band and in a high impedance state for the sixth frequency band.

In this embodiment, the first radiator 11 is connected to the first signal source 30, and the second radiator 12 is connected to the second signal source 40 and the third signal source 50, and the second band-pass circuit G2 is configured to make the third frequency band (for example, the B41 frequency band) supported by the third resonance mode lower and the sixth frequency band supported by the sixth resonance mode unable to pass through, so that the excitation signal provided by the third signal source 50 is ensured, the sixth resonance mode can be formed by the radiating branch 10, and the sixth frequency band is covered. While also avoiding interference with the signal transmission from third signal source 50 by the excitation signal of the MHB frequency band provided by first signal source 30.

Specifically, referring to fig. 26, the second band-pass circuit G2 includes a fifth sub-capacitor C05. For example, the capacitance value of the fifth sub-capacitor C05 is 3.3pF.

Optionally, the second feeding point E1 and the connection point E are located at the same position, so that one connection elastic sheet can be reduced. Further, the switch of the LB frequency band may be set to be the same as the switch of the resonance point of the second resonance mode. In other embodiments, the second feeding point E1 is spaced apart from the connection point E.

Optionally, referring to fig. 25, the third matching circuit M3 of the antenna assembly 100 further includes a second switch K2 and a second tuning circuit 60. The fixed end of the second switch K2 is electrically connected to the connection point E. A portion of the select terminals of the second switch K2 are electrically connected to the first tuning circuit 20 and the second tuning circuit 60. The other end of the second tuning circuit 60 is grounded. The first selection terminal of the second switch K2 is electrically connected to the first tuning circuit 20, and the fourth selection terminal of the second switch K2 is electrically connected to the second tuning circuit 60.

The fixed end of the second switch K2 is configured to be turned on with the first tuning circuit 20 or the second tuning circuit 60 to switch the size of the second frequency band, so as to realize the switching of the frequency band supported by the second resonance mode.

Referring to fig. 26, the first tuning circuit 20 includes a third capacitor C3. The second tuning circuit 60 includes a fourth capacitor C4. The capacitance value of the third capacitor C3 is different from the capacitance value of the fourth capacitor C4. Optionally, the capacitance value of the third capacitor C3 is greater than the capacitance value of the fourth capacitor C4. Optionally, the capacitance value of the third capacitor C3 is 1.2pF. Optionally, the capacitance value of the fourth capacitor C4 is 1.0pF. Of course, in other embodiments, the capacitance value of the third capacitor C3 is smaller than the capacitance value of the fourth capacitor C4.

Optionally, referring to fig. 25, the antenna assembly 100 further includes a plurality of second tuning branches T2. The other part of the selection ends of the second switch K2 are also electrically connected to one end of the second tuning branch T2. The impedance of each of said second tuning branches T2 is different. The other end of the second tuning branch T2 is grounded. The fixed end of the second switch K2 is configured to conduct a different second tuning branch T2 to switch the sub-band of the sixth frequency band.

In this embodiment, the second switch K2 functions in a manner similar to a multiple pole, multiple throw switch. In other words, the second switch K2 has a plurality of selection terminals. The fixed end of the second switch K2 is independently conductive to each selection end.

Each selection end is electrically connected with a second tuning branch T2, and further, the fixed end of the second switch K2 is controlled to be electrically connected with the corresponding selection end, so that the impedance of the third matching circuit M3 is changed, and the size in the sixth frequency band is tuned.

Optionally, the second switch K2 is configured to be turned off from the tuning branches, i.e. the fixed end of the first switch K1 is turned off from all the selection ends, and may be in an initial state of the first switch K1. In the first state of the first switch K1 in this embodiment, the sixth frequency band covers the N28 frequency band, and the antenna assembly 100 can operate in the N28 frequency band.

Optionally, referring to fig. 26, a plurality of the second tuning branches T2 includes a third inductance L3. The third inductor L3 is electrically connected between the second selection terminal of the second switch K2 and the reference ground. The fixed end of the second switch K2 is configured to be conductive to the third inductor L3, that is, the fixed end of the second switch K2 is conductive to the second selection end of the second switch K2. In the second state of the second switch K2 in the present embodiment, the sixth frequency band covers at least the B5 frequency band, and the antenna assembly 100 can operate in the B5 frequency band. The inductance value of the third inductance L3 is 18nH.

Referring to fig. 26, the plurality of second tuning branches T2 includes a fourth inductance L4. The inductance value of the fourth inductor L4 is smaller than the inductance value of the third inductor L3. The fourth inductor L4 is electrically connected between the third selection terminal of the second switch K2 and the reference ground. The fixed end of the second switch K2 is configured to be conductive to the fourth inductor L4, that is, the fixed end of the second switch K2 is conductive to the third selection end of the second switch K2. The sixth frequency band covers at least the B8 frequency band, and the antenna assembly 100 is operable in the B8 frequency band. The inductance value of the fourth inductance L4 is 12nH.

Optionally, referring to fig. 27, the antenna assembly 100 further includes a fourth matching circuit M4 and a combiner 70. One end of the fourth matching circuit M4 is electrically connected to the second feeding point E1, the other end of the fourth matching circuit M4 is electrically connected to the combiner 70 and the combining end, one branching end of the combiner 70 is electrically connected to the second signal source 40, and the other branching end of the combiner 70 is electrically connected to the third signal source 50.

In this embodiment, after the first signal source 30 and the second signal source 40 are combined by the combiner 70, they are fed to the second radiator 12, so that the fifth resonant mode and the sixth resonant mode can be formed on the second radiator 12. The combiner 70 is capable of decoupling the second signal source 40 from the third signal source 50, so as to avoid mutual interference between the second signal source 40 and the third signal source 50.

In this embodiment, the first signal source 30 and the first radiator 11 form an MHB antenna, the second signal source 40 and the second radiator 12 form an N78 antenna, and the third signal source 50 and the second radiator 12 form an LB antenna, so that the antenna assembly 100 provided in the embodiment of the application reduces the antenna size, saves the cost, and can support the MHB frequency band+n78 frequency band+lb frequency band, and the above second band-stop circuit D2 and fourth resistive circuit are decoupling circuits between the N78 antenna and the LB antenna by designing the first matching circuit M1, the second matching circuit M2 and the third matching circuit M3. The third band-stop circuit D3 and the first band-stop circuit D1 are decoupling circuits between the N78 antenna and the MHB antenna. The first band-pass circuit G1 and the second band-pass circuit G2 are decoupling circuits between the LB antenna and the MHB antenna. The isolation degree between the excitation signals of the three signal sources is increased, and the mutual interference is reduced.

MHB antennas are typically single mode antennas, i.e. create a resonant mode. When the antenna switch is used for switching the frequency bands, the performance of the CA state, which cannot cover two MHB frequency bands simultaneously, such as B3+B41, is poor.

According to the antenna assembly 100 and the electronic device 1000 provided by the application, the MHB antenna uses multiple modes to improve the efficiency and the bandwidth, the LB antenna and the N78 antenna use the decoupling circuit, so that the common feed point of the N78 antenna and the LB antenna is realized, the link loss of the N78 is reduced, the antenna cost is reduced, and the space occupied by the antenna is reduced.

Referring to fig. 28, an example is shown in which the radiation branch 10 is disposed on a side of a frame of the electronic device 1000. The first grounding point a, the first feeding point B, the first free end C, the second free end D and the second feeding point E1 are all disposed on a side edge of the main board 600. The second grounding point F is disposed beside the battery 700, and the second grounding point F can be physically grounded. Since the electronic device is not disposed beside the battery 700 as conveniently as the main board 600, a portion between the second feeding point E1 of the second radiator 12 and the second ground point F is disposed beside the battery 700, and thus the position beside the battery 700 can be fully utilized.

Referring to fig. 29, the LB antenna and the N78 antenna share a feeding point, the decoupling circuit is utilized to reduce mutual interference, a fourth band-stop circuit D4 (N78 decoupling circuit) is added to the forefront end of the third matching circuit M3, a second band-stop circuit D2 (LB decoupling circuit) is added to the forefront end of the second matching circuit M2, in addition, the first radiator 11 and the second radiator 12 are arranged in a mouth-to-mouth manner, the decoupling circuit is also added to reduce mutual interference, the first band-stop circuit D1 (N78 decoupling circuit) is added to the front end of the first matching circuit M1, a third band-stop circuit D3 (N41 decoupling circuit) is added to the second matching circuit M2, and the second band-pass circuit G2 (N41 decoupling circuit) is added to the ground to the rear end of the third matching circuit M3, thereby also playing a role of isolating B41.

Referring to fig. 30, fig. 30 is an S-curve of the LB antenna and the N78 antenna. Curve a1 is the S-curve of the LB antenna. Curve a2 is the S-curve of the N78 antenna. It can be seen from the curve a1 that the sixth frequency band supported by the sixth resonance mode covers the B28 frequency band. It can be seen from the curve a2 that the fifth frequency band supported by the fifth resonance mode covers the N78 frequency band.

Referring to fig. 31, fig. 31 is a schematic diagram illustrating a current distribution of a fifth resonant mode of the N78 antenna when the antenna assembly 100 is disposed on the first side 323 of the electronic device 1000. The current profile of the fifth resonant mode is the 1/4 lambda current produced by the DE branch.

Referring to fig. 32, fig. 32 is a schematic diagram showing a current distribution of a sixth resonant mode of the LB antenna when the antenna assembly 100 is disposed on the first side 323 of the electronic device 1000. The current distribution of the sixth resonance mode is 1/4 lambda current generated by DF branches, and the mode can be switched to the B5 frequency band/B8 frequency band through the second switch K2, so that the coverage of the whole LB frequency band is realized.

According to the antenna assembly 100 and the electronic device 1000 provided by the embodiments of the present application, the radiating branch 10 includes a first radiator 11 and a second radiator 12, the first radiator 11 includes a first grounding point a, a first feeding point B and a first free end C, the second radiator 12 includes a second free end D, a connection point E and a second grounding point F, a coupling gap is formed between the first free end C and the second free end D, one end of the first tuning circuit 20 is electrically connected to the connection point E, the other end of the first tuning circuit 20 is grounded, the first signal source 30 is electrically connected to the first feeding point B, the first signal source 30 is configured to provide a first excitation signal of a first frequency band, the first excitation signal is used to excite the radiating branch 10 to form a first resonant mode, the first resonant mode is a 1/4 wavelength mode between the first grounding point a and the first free end C and supporting the first frequency band, the first excitation signal is also used to form a second resonant mode when the first tuning circuit 20 is electrically conducted with the connection point E, the second resonant mode is a second resonant mode formed between the connection point E and the second tuning circuit F and supporting the second frequency band, the second resonant mode is more than the first resonant mode and the first frequency band is formed by the second resonant mode and the second frequency band is more than the first resonant mode and the first frequency band is more than the first resonant mode and the second frequency band is more than the first frequency band and the first resonant mode is more than the first frequency band and the second resonant mode is designed. The MHB antenna provided by the embodiment of the application has the advantages that the efficiency and the bandwidth are improved in a multi-mode manner, the decoupling circuit is used for the LB antenna and the N78 antenna, so that the common feed point of the N78 antenna and the LB antenna is realized, the link loss of the N78 antenna is reduced, the antenna cost is reduced, and the antenna occupation space is reduced.

Optionally, referring to fig. 33, an antenna assembly 100 'is further provided according to an embodiment of the present application, which includes a first antenna branch 12', a first antenna signal source 40 ', a first decoupling circuit D2', a second antenna signal source 50 ', and a second decoupling circuit D4'.

The first antenna branch 12 'includes a first antenna free end D', a first antenna feed point E ', and a first antenna ground point F'. The first antenna branch 12 corresponds to the aforementioned second radiator 12. The first antenna free end d″ is the aforementioned second free end D. The first antenna feed point E' is the aforementioned second feed point E. The first antenna ground point F' is the aforementioned second ground point F.

The first antenna signal source 40 is electrically connected to the first antenna feed point E'. The first antenna signal source 40 is configured to excite the first antenna branch 12' to form a first target resonant mode supporting a first target frequency band. The first antenna signal source 40 is the aforementioned second signal source 40.

The first decoupling circuit D2 ' is electrically connected between the first antenna feed point E ' and the first antenna signal source 40 '. The first decoupling circuit D2 ' is electrically connected between the first antenna feed point E ' and the first antenna signal source 40 '. The first decoupling circuit D2 is configured to present a low impedance state to the first target frequency band and present a high impedance state to the second target frequency band. The first decoupling circuit D2 is the aforementioned second band-stop circuit D2. The first target frequency band references the aforementioned second frequency band.

The second antenna signal source 50 'is electrically connected to the first antenna feed point E', and the second antenna signal source 50 'is configured to excite the first antenna branch 12' to form a second target resonant mode supporting the second target frequency band. The second antenna signal source 50 is the third signal source 50. The second target frequency band references the aforementioned third frequency band.

The second decoupling circuit D4 'is electrically connected between the first antenna feeding point E' and the second antenna signal source 50 ', and the second decoupling circuit D4' is configured to be in a low impedance state for the second target frequency band and in a high impedance state for the first target frequency band. The second decoupling circuit D4″ is the fourth band stop circuit D4.

The antenna assembly 100 according to the embodiment of the present application includes a first antenna branch 12 'including a first antenna free end D', a first antenna feed point E 'and a first antenna ground point F'; the first antenna signal source 40 'is electrically connected to the first antenna feed point E', and the first antenna signal source 40 'is configured to excite the first antenna branch 12' to form a first target resonant mode supporting a first target frequency band; the first decoupling circuit D2 'is electrically connected between the first antenna feeding point E' and the first antenna signal source 40 ', the first decoupling circuit D2' is configured to present a low impedance state to the first target frequency band and a high impedance state to the second target frequency band; the second antenna signal source 50 'is electrically connected to the first antenna feed point E', and the second antenna signal source 50 'is configured to excite the first antenna branch 12' to form a second target resonant mode supporting the second target frequency band; the second decoupling circuit D4 ' is electrically connected between the first antenna feeding point E ' and the second antenna signal source 50 ', the second decoupling circuit D4 ' is configured to present a low impedance state to the second target frequency band and a high impedance state to the first target frequency band, so as to realize that the first antenna signal source 40's and the second antenna signal source 50's are fed together to share the first antenna branch 12 ' and are decoupled from each other, and to reduce the mutual interference between the first antenna signal source 40's and the second antenna signal source 50's while saving the antenna branch.

Referring to fig. 34, the antenna assembly 100 further includes a second antenna branch 11 'and a third antenna signal source 30'. The second antenna branch 11 'includes a second antenna free end C', a second antenna feed point B ', and a second antenna ground point a', and a coupling gap is formed between the second antenna free end C 'and the first antenna free end D'.

The second antenna branch 11 is the first radiator 11. The second antenna free end C' is the aforementioned first free end C. The second antenna feed point B' is the aforementioned first feed point B. The second antenna ground point a' is the first ground point a described above. The third antenna signal source 30' is the first signal source 30 described above.

Referring to fig. 34, the third antenna signal source 30 'is electrically connected to the second antenna feeding point B'. The third antenna signal source 30 is configured to excite the second antenna branch 11' to form a third target resonant mode supporting a third target frequency band. The third target frequency band references the first frequency band described above.

In the present embodiment, the first antenna branch 12 'is coupled to the second antenna branch 11' by providing the second antenna branch 11 ', and the antenna assembly 100' supports the first target frequency band, the second target frequency band, and the third target frequency band.

Referring to fig. 35, the antenna assembly 100 further includes a third decoupling circuit D3 'and a fourth decoupling circuit G2'. The third decoupling circuit D3 ' is electrically connected between the first decoupling circuit D2 ' and the first antenna signal source 40 '. The third decoupling circuit D3 is configured to present a low impedance state to the first target frequency band and present a high impedance state to the third target frequency band. One end of the fourth decoupling circuit G2 is electrically connected to the second antenna signal source 50', and the other end of the fourth decoupling circuit G2 is grounded. The fourth decoupling circuit G2 is configured to present a high impedance state to the second target frequency band and present a low impedance state to the third target frequency band.

The third decoupling circuit D3″ is the aforementioned third band reject circuit D3.

The fourth decoupling circuit G2″ is the aforementioned second bandpass circuit G2.

Referring to fig. 35, the antenna assembly 100 further includes a fifth decoupling circuit D1 'and a sixth decoupling circuit G1'. The fifth decoupling circuit D1 ' is electrically connected between the second antenna feed point B ' and the third antenna signal source 30 '. The fifth decoupling circuit D1 is configured to present a high impedance state to the first target frequency band and a low impedance state to the third target frequency band. One end of the sixth decoupling circuit G1 'is electrically connected to one end of the fifth decoupling circuit D1' away from the second antenna feeding point B ', and the other end of the sixth decoupling circuit G1' is grounded. The sixth decoupling circuit G1 is configured to present a high impedance state to the third target frequency band and a low impedance state to the second target frequency band.

The fifth decoupling circuit D1″ is the aforementioned first band reject circuit D1.

The sixth decoupling circuit G1″ is the first band-pass circuit G1 described above.

The first target frequency band comprises an N78 frequency band. The first target resonant mode comprises a 1/4 wavelength mode between the first antenna feed point E 'and the first antenna free end D'. The first target resonant mode is the aforementioned fifth resonant mode.

The second target frequency band includes an LB frequency band. The second target resonant mode comprises a 1/4 wavelength mode between the first antenna ground point F 'and the first antenna free end D'. The second target resonant mode is the aforementioned sixth resonant mode.

The third target frequency band comprises an MHB frequency band. The third target resonance mode includes at least one of a 1/4 wavelength mode between the second antenna ground point a 'and the second antenna free end C' (being the aforementioned first resonance mode), a 1/2 wavelength mode between the first antenna feed point E 'and the first antenna ground point F', and the second feed point is configured to be grounded through a target tuning circuit (being the aforementioned second resonance mode), a 3/4 wavelength mode between the second antenna feed point B 'and the first antenna ground point F' (being the aforementioned third resonance mode), and a 1-fold wavelength mode between the first antenna ground point F 'and the second antenna ground point a' (being the aforementioned fourth resonance mode).

The target tuning circuit is the first tuning branch T1.

The circuit between the first antenna signal source 40 ' of the antenna assembly 100 ' and the first antenna feed point E ' forms the aforementioned second matching circuit M2. The circuit between the second antenna signal source 50 ' of the antenna assembly 100 ' and the first antenna feed point E ' forms the aforementioned third matching circuit M3. The circuit between the third antenna signal source 30 ' of the antenna assembly 100 ' and the second antenna feed point B ' forms the aforementioned first matching circuit M1.

The antenna assembly 100 'provided in this embodiment may be combined with the technical solutions of the antenna assembly 100 provided in the foregoing embodiments, so as to implement the wideband of the frequency band supported by the antenna assembly 100' and implement the switchable resonance point of the second resonance mode, the switchable sub-frequency band of the LB frequency band, the switchable sub-frequency band of the MHB frequency band, and the impedance matching in each frequency band.

While embodiments of the present application have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and alternatives to the above embodiments may be made by those skilled in the art within the scope of the application, which is also to be regarded as being within the scope of the application.

Claims

1. An antenna assembly, comprising:

The first signal source is electrically connected with the first feed point and is used for providing a first excitation signal of a first frequency band, the first excitation signal is used for exciting the first radiator to form a first resonance mode, and the first resonance mode is a 1/4 wavelength mode which is resonated between the first grounding point and the first free end and supports the first frequency band; the first excitation signal is further used for exciting the second radiator to form a second resonance mode when the first tuning circuit is configured to be electrically conducted with the connection point, the second resonance mode is a 1/2 wavelength mode which resonates between the connection point and the second grounding point and supports a second frequency band, the resonance current of the second resonance mode flows through the first tuning circuit, and the center frequency point of the second frequency band is larger than the center frequency point of the first frequency band.

2. The antenna assembly of claim 1, wherein the first excitation signal is further configured to excite the radiating branch to form a third resonant mode, the third resonant mode being a 3/4 wavelength mode that resonates between the first feed point and the second ground point and supports a third frequency band, the second frequency band, and the first frequency band being medium-high frequency bands, a center frequency point of the third frequency band being greater than a center frequency point of the second frequency band.

3. The antenna assembly of claim 2, wherein the first excitation signal is further configured to excite the radiating branch to form a fourth resonant mode, the fourth resonant mode being a 1-fold wavelength mode resonating between the first ground point and the second ground point and supporting a fourth frequency band, the fourth frequency band being a medium-high frequency band, a center frequency point of the fourth frequency band being greater than a center frequency point of the third frequency band.

4. The antenna assembly of claim 3, further comprising a first matching circuit electrically connected between the first feed point and the first signal source, the first matching circuit comprising a first switch and a plurality of first tuning branches, a fixed end of the first switch being electrically connected between the first feed point and the first signal source, each select end of the first switch being electrically connected to one end of one of the first tuning branches, the impedance of each of the first tuning branches being different, the other end of the first tuning branch being grounded or electrically connected to the first signal source, the fixed end of the first switch being configured to turn on a different one of the first tuning branches to switch a sub-band of a medium-high frequency band.

5. The antenna assembly of claim 4, wherein the first switch is configured to be disconnected from all of the plurality of first tuning branches, the first frequency band covering at least a B3 frequency band;

The plurality of first tuning branches comprise a first resistor electrically connected between a selection end of the first switch and the first signal source, a fixed end of the first switch is configured to be conducted with the first resistor, and the first frequency band at least covers the B1 frequency band;

The plurality of first tuning branches further includes a first inductor electrically connected between the selection end of the first switch and the reference ground, the fixed end of the first switch is configured to be conducted with the first inductor, and the first frequency band at least covers the B2 frequency band.

6. The antenna assembly of claim 4, wherein a plurality of the first tuning branches include a first capacitor electrically connected between a select terminal of the first switch and a reference ground, a fixed terminal of the first switch configured to be conductive with the first capacitor, the third frequency band covering at least a B41 frequency band;

the plurality of first tuning branches comprise a second capacitor, the second capacitor is electrically connected between the selection end of the first switch and the reference ground, the capacitance value of the second capacitor is larger than that of the first capacitor, the fixed end of the first switch is configured to be conducted with the second capacitor, and the third frequency band at least covers the B40 frequency band.

7. The antenna assembly of claim 4, wherein the first matching circuit further comprises a first matching branch for tuning an impedance of the radiating branch; the first matching branch circuit comprises a third capacitor, and the third capacitor is electrically connected between the fixed end of the first switch and the first signal source;

and/or, the first matching branch circuit comprises a second inductor, one end of the second inductor is electrically connected to the fixed end of the first switch, and the other end of the second inductor is grounded.

8. The antenna assembly of claim 2, wherein the second radiator further comprises a second feed point; the antenna assembly further comprises a second signal source electrically connected with the second feed point, the second signal source is used for exciting the second radiator to form a fifth resonance mode supporting a fifth frequency band, the antenna assembly further comprises a third signal source electrically connected with the second feed point, and the third signal source is used for exciting the second radiator to form a sixth resonance mode supporting a sixth frequency band.

9. The antenna assembly of claim 8,

The antenna assembly further comprises a first band-stop circuit, wherein the first band-stop circuit is electrically connected between the first feed point and the first signal source, and the first band-stop circuit is a circuit which is in a high-impedance state for a frequency band supported by the fifth resonance mode and in a low-impedance state for the middle-high frequency band;

The antenna assembly further comprises a first band-pass circuit, one end of the first band-pass circuit is electrically connected between the first band-stop circuit and the first signal source, the other end of the first band-pass circuit is grounded, and the first band-pass circuit is a circuit which is in a low impedance state for a frequency band supported by the sixth resonance mode and in a high impedance state for the middle-high frequency band.

10. The antenna assembly of claim 2, wherein the second radiator further comprises a second feed point; the antenna assembly further comprises a second signal source electrically connected with the second feed point, and the second signal source is used for exciting the second radiator to form a fifth resonance mode supporting a fifth frequency band; the antenna assembly further comprises a first band-stop circuit, wherein the first band-stop circuit is electrically connected between the first feed point and the first signal source, and the first band-stop circuit is a circuit which is in a high-impedance state for a frequency band supported by the fifth resonance mode and in a low-impedance state for the middle-high frequency band.

11. The antenna assembly of claim 10 further comprising a third signal source electrically connected to the second feed point, the third signal source for exciting the second radiator to form a sixth resonant mode supporting a sixth frequency band, the antenna assembly further comprising a first pass circuit having one end electrically connected between the first band stop circuit and the first signal source, the other end of the first pass circuit being grounded, the first pass circuit being a circuit that is in a low impedance state for the frequency band supported by the sixth resonant mode and in a high impedance state for the medium and high frequency band.

12. An antenna assembly according to claim 9 or 11, wherein the fifth frequency band is an N78 frequency band and the sixth frequency band is a low frequency band.

13. The antenna assembly of claim 9 or 11, further comprising a second band-stop circuit electrically connected between the second feed point and the second signal source and a third band-stop circuit electrically connected between the second feed point and the second signal source, the second band-stop circuit being in a low impedance state for the fifth frequency band and in a high impedance state for the sixth frequency band, the third band-stop circuit being in a low impedance state for the fifth frequency band and in a high impedance state for the third frequency band.

14. The antenna assembly of claim 12 further comprising a fourth band-stop circuit electrically connected between the second feed point and the third signal source, the fourth band-stop circuit being in a low impedance state for the sixth frequency band and in a high impedance state for the fifth frequency band, and a second band-pass circuit having one end electrically connected between the fourth band-stop circuit and the third signal source, the other end grounded, the second band-pass circuit being in a low impedance state for the third frequency band and in a high impedance state for the sixth frequency band.

15. The antenna assembly of claim 12 wherein the second feed point is co-located with the connection point.

16. The antenna assembly of claim 15, further comprising a second switch and a second tuning circuit, a fixed end of the second switch being electrically connected to the connection point, a portion of a selection end of the second switch being electrically connected to the first tuning circuit and the second tuning circuit, another end of the second tuning circuit being grounded, the fixed end of the second switch being configured to be in conductive communication with the first tuning circuit or the second tuning circuit to switch a size of the second frequency band.

17. The antenna assembly of claim 16 wherein the first tuning circuit comprises a third capacitance and the second tuning circuit comprises a fourth capacitance, the third capacitance having a capacitance value that is greater than a capacitance value of the fourth capacitance.

18. The antenna assembly of claim 17, further comprising a plurality of second tuning branches, a further portion of the select terminals of the second switches further electrically connected to one end of the second tuning branches, each of the second tuning branches having a different impedance, the further end of the second tuning branches being grounded, the fixed ends of the second switches being configured to conduct different ones of the second tuning branches to switch the sub-bands of the sixth frequency band.

19. The antenna assembly of claim 18, wherein the sixth frequency band covers an N28 frequency band when the second switch is configured to be disconnected from a plurality of the tuning branches;

The plurality of second tuning branches comprise a third inductor, the third inductor is electrically connected between the selection end of the second switch and the reference ground, the fixed end of the second switch is configured to be conducted with the third inductor, and the sixth frequency band at least covers the B5 frequency band;

The plurality of second tuning branches comprise a fourth inductor, the inductance value of the fourth inductor is smaller than that of the third inductor, the fourth inductor is electrically connected between the selection end of the second switch and the reference ground, the fixed end of the second switch is configured to be conducted with the fourth inductor, and the sixth frequency band at least covers the B8 frequency band.

20. The antenna assembly of any one of claims 8, 9, 11, further comprising a second matching circuit and a combiner, one end of the second matching circuit being electrically connected to the second feed point, the other end of the second matching circuit being electrically connected to the combiner and the combining terminal, one shunt terminal of the combiner being electrically connected to the second signal source, the other shunt terminal of the combiner being electrically connected to the third signal source.

21. An antenna assembly, comprising:

22. The antenna assembly of claim 21, further comprising a second antenna branch and a third antenna signal source, the second antenna branch comprising a second antenna free end, a second antenna feed point, and a second antenna ground point, the second antenna free end forming a coupling gap with the first antenna free end;

The third antenna signal source is electrically connected with the second antenna feed point and is used for exciting the second antenna branch to form a third target resonance mode supporting a third target frequency band.

23. The antenna assembly of claim 22 further comprising a third decoupling circuit and a fourth decoupling circuit, the third decoupling circuit being electrically connected between the first decoupling circuit and the first antenna signal source, the third decoupling circuit being configured to be in a low impedance state for the first target frequency band and in a high impedance state for the third target frequency band; one end of the fourth decoupling circuit is electrically connected to the second antenna signal source, the other end of the fourth decoupling circuit is grounded, and the fourth decoupling circuit is used for presenting a high impedance state to the second target frequency band and presenting a low impedance state to the third target frequency band.

24. The antenna assembly of claim 22 further comprising a fifth decoupling circuit electrically connected between the second antenna feed point and the third antenna signal source, the fifth decoupling circuit being configured to present a high impedance state to the first target frequency band and a low impedance state to the third target frequency band; one end of the sixth decoupling circuit is electrically connected to one end of the fifth decoupling circuit, which is far away from the second antenna feed point, and the other end of the sixth decoupling circuit is grounded, and the sixth decoupling circuit is configured to present a high impedance state to the third target frequency band and present a low impedance state to the second target frequency band.

25. The antenna assembly of claim 22 wherein the first target frequency band comprises an N78 frequency band, the first target resonant mode comprising a 1/4 wavelength mode between the first antenna feed point and the first antenna free end;

the second target frequency band comprises an LB frequency band, and the second target resonant mode comprises a 1/4 wavelength mode between the first antenna ground point and the first antenna free end.

26. The antenna assembly of claim 22, wherein the third target frequency band comprises an MHB frequency band, the third target resonant mode comprises at least one of a 1/4 wavelength mode between the second antenna ground point and the second antenna free end, a 1/2 wavelength mode between the first antenna feed point and the first antenna ground point, and the second feed point is configured to be grounded by a target tuning circuit, a 3/4 wavelength mode between the second antenna feed point and the first antenna ground point, and a 1-fold wavelength mode between the first antenna ground point and the second antenna ground point.

27. An electronic device comprising an antenna assembly as claimed in any one of claims 1 to 26.