CN117913511A

CN117913511A - Antenna assembly, middle frame assembly and electronic equipment

Info

Publication number: CN117913511A
Application number: CN202211238057.6A
Authority: CN
Inventors: 周林
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-10-10
Filing date: 2022-10-10
Publication date: 2024-04-19
Also published as: WO2024078167A1

Abstract

The application discloses an antenna assembly, a middle frame assembly and electronic equipment, and relates to the technical field of communication. In the application, a first feed source is used for exciting a radiator so as to support a first frequency band and a second frequency band; the first feed source is electrically connected with the first feed point through a first frequency selection circuit, the first frequency selection circuit is grounded, and current supporting the first frequency band is configured to flow through the first frequency selection circuit from the ground to be input into the radiator; the frequency selection point is grounded through a second frequency selection circuit, and the current supporting the second frequency band is configured to flow through the second frequency selection circuit from the ground to be input into the radiator. According to the application, the wireless transmission function of two frequency bands is realized on a single radiator, so that the number of radiators is effectively reduced, and the occupation of the antenna assembly on the space of the electronic equipment is further reduced.

Description

Antenna assembly, middle frame assembly and electronic equipment

Technical Field

The application relates to the technical field of communication, in particular to an antenna assembly, a middle frame assembly and electronic equipment.

Background

With more and more communication functions of electronic devices, a single antenna cannot meet the requirement of wireless communication of people. Therefore, many electronic devices are equipped with multiple antennas to receive different wireless signals, such as GSM, WIFI, etc. However, a plurality of antennas occupy a large area, and there is a problem of mutual interference.

Disclosure of Invention

The present application provides an antenna assembly comprising:

the radiator is provided with a first free end, a first feed point and a frequency selection point, wherein the first feed point is positioned between the first free end and the frequency selection point;

the first feed source is used for exciting the radiator to support a first frequency band and a second frequency band;

The first frequency selection circuit is electrically connected between the first feed point and the first feed source so that the first feed source is electrically connected with the first feed point through the first frequency selection circuit, the first frequency selection circuit is grounded, and current supporting the first frequency band is configured to flow through the first frequency selection circuit from the ground to be input into the radiator; and

And the second frequency selecting circuit is electrically connected between the frequency selecting point and the ground, so that the frequency selecting point is grounded through the second frequency selecting circuit, and the current supporting the second frequency band is configured to flow through the second frequency selecting circuit from the ground to be input into the radiator.

The application provides a middle frame assembly, comprising:

A substrate;

the frame is arranged around the substrate in a surrounding mode; and

The antenna assembly as described above, wherein the radiator is disposed on the bezel.

The present application provides an electronic device including:

A display screen;

A main housing for mounting the display screen, the main housing including a ground plane and a bezel disposed at least partially around the ground plane,

The antenna assembly as described above, wherein the radiator is disposed on the frame and forms a gap with the ground plane.

By adopting the technical scheme of the application, the application has the following beneficial effects: according to the application, the antenna assembly realizes the wireless transmission function of two frequency bands through a single radiator by utilizing one feed point, so that the number of radiators is effectively reduced, and the occupation of the antenna assembly to the space of the electronic equipment is further reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an antenna assembly according to some embodiments of the present application;

FIG. 2 is a schematic diagram of an antenna assembly according to some embodiments of the present application;

fig. 3 is a schematic structural diagram of the first feed and the first frequency selection circuit in the embodiment shown in fig. 2 in other embodiments;

fig. 4 is a schematic structural diagram of the second feed and the second frequency selection circuit in the embodiment shown in fig. 2 in other embodiments;

fig. 5 is a schematic structural diagram of the antenna assembly shown in fig. 2 in another embodiment;

fig. 6 is a schematic structural diagram of the antenna assembly shown in fig. 2 in another embodiment;

fig. 7 is a schematic structural diagram of the antenna assembly shown in fig. 6 in another embodiment;

Fig. 8 is a schematic structural diagram of the third feed and the third frequency selective circuit in the embodiment shown in fig. 7, in other embodiments;

Fig. 9 is a schematic structural view of the antenna assembly shown in fig. 7 in another embodiment;

FIG. 10 is a schematic diagram of the switching circuit 80 shown in FIG. 9 in some embodiments;

Fig. 11 is a schematic diagram of a structure of the switching circuit 80 in another embodiment of the antenna assembly in the embodiment shown in fig. 10;

fig. 12 is a schematic view of the antenna assembly of fig. 9 in another embodiment;

Fig. 13 is a schematic view of the antenna assembly of fig. 9 in another embodiment;

Fig. 14 is a graph of return loss of the antenna assembly of fig. 13 excited by a first feed in another embodiment;

fig. 15 is a graph of the overall system efficiency (System Total Efficiency) of the antenna assembly of fig. 13 excited by the first feed in another embodiment;

fig. 16 is a graph of return loss of the antenna assembly of fig. 13 excited by a second feed in another embodiment;

fig. 17 is a graph of the overall efficiency of the system in which the antenna assembly of fig. 13 is excited by a second feed in another embodiment;

fig. 18 is a graph of return loss of the antenna assembly of fig. 13 excited by a third feed in another embodiment;

fig. 19 is a graph of the overall efficiency of the system in which the antenna assembly of fig. 13 is excited by a third feed in another embodiment;

FIG. 20 is an exploded view of an electronic device according to an embodiment of the present application;

FIG. 21 is a schematic view of the frame assembly of the embodiment of FIG. 20;

Fig. 22 is a schematic structural diagram of an electronic device according to an embodiment of the application.

Detailed Description

The present application will be described in further detail with reference to the drawings and embodiments. It is to be noted that the following embodiments are only for illustrating the present application, but do not limit the scope of the present application. Likewise, the following embodiments are only some, but not all, of the embodiments of the present application, and all other embodiments obtained by those skilled in the art without making any inventive effort are within the scope of the present application.

Reference herein 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 such phrases 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 explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

The application provides an antenna assembly. The antenna assembly can be applied to electronic equipment. The antenna assembly may support at least one of a WiFi (Wireless-Fidelity) frequency band, a medium-high frequency band, an NR (new air interface) frequency band, or a low frequency band.

As used herein, "electronic equipment" (which may also be referred to as a "terminal" or "mobile terminal" or "electronic device") includes, but is not limited to, devices configured to receive/transmit communication signals via a wireline electrical connection (e.g., via a public-switched telephone network (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable electrical connection, and/or another data electrical connection/network) and/or via a wireless interface (e.g., for a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter, and/or another communication terminal). A communication terminal configured to communicate through a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal", or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellites or cellular telephones; a Personal Communications System (PCS) terminal that may combine a cellular radiotelephone with data processing, facsimile and data communications capabilities; a PDA that can include a radiotelephone, pager, internet/intranet access, web browser, organizer, calendar, and/or a Global Positioning System (GPS) receiver; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. The mobile phone is the electronic equipment provided with the cellular communication module.

The antenna assembly may be one or more of a flexible circuit board (Flexible Printed Circuit, FPC) antenna, a Laser Direct Structuring (LDS) antenna, a Printed Direct Structuring (PDS) antenna, a metal bezel antenna (also known as a metal stub antenna). Of course, the antenna assembly may be other types of antennas, which will not be described in detail.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an antenna assembly according to some embodiments of the application. The antenna assembly 100 may include a radiator 10, a first feed 20, a first frequency selective circuit 30, and a second frequency selective circuit 50. The radiator 10 has a first free end 11, a first feed point 13 and a frequency selection point 14. The first feeding point 13 is located between the first free end 11 and the frequency selective point 14. The first feed 20 is used to excite the radiator 10 to support the first frequency band and the second frequency band. The first frequency selection circuit 30 is electrically connected between the first feed point 13 and the first feed source 20, so that the first feed source 20 is electrically connected to the first feed point 13 through the first frequency selection circuit 30, and the first frequency selection circuit 30 is grounded. The current I1 supporting the first frequency band is configured to flow from ground through the first frequency selective circuit 30 to be input to the radiator 10. The second frequency selection circuit 50 is electrically connected between the frequency selection point 14 and ground, so that the frequency selection point 14 is grounded through the second frequency selection circuit 50, and the current I2 supporting the second frequency band is configured to flow through the second frequency selection circuit 50 from the ground to be input to the radiator 10.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an antenna assembly according to some embodiments of the application. The antenna assembly 100 may include a radiator 10, a first feed 20 for exciting the radiator 10, a first frequency selective circuit 30 electrically connected between the radiator 10 and the first feed 20, a second feed 40 for exciting the radiator 10, and a second frequency selective circuit 50 electrically connected between the radiator 10 and the second feed 40. The first feed 20 excites the radiator 10 to support a first frequency band and a second frequency band. The second feed 40 may also excite the radiator 10, supporting at least one frequency band. The antenna assembly 100 can excite the radiator 10 through the first feed source 20 and the second feed source 40, so that the wireless transmission function of two frequency bands such as a first frequency band and a second frequency band is realized, the number of the radiator 10 is effectively reduced, and the occupation of the antenna assembly 100 to the space of the electronic equipment is further reduced.

The terms "first," "second," "third," and the like in this disclosure are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", "a third", etc. may include at least one such feature, either explicitly or implicitly.

The radiator 10 may be, but is not limited to being, an LDS radiator, or an FPC radiator, or a PDS radiator, or a metal stub radiator. In some embodiments, the radiator 10 may be a structural antenna (MECHANICAL DESIGN ANTENNA, MDA) radiator designed with the electronics' own insert metal.

The shape, structure and material of the radiator 10 are not particularly limited, and the shape of the radiator 10 includes, but is not limited to, a bent shape, a bar shape, a sheet shape, a rod shape, a coating, a film, etc. When the radiator 10 is in a strip shape, the extending track of the radiator 10 is not limited, so the radiator 10 can extend in a straight line, a curve, a multi-section bending track, and the like. The radiator 10 may be a line with a uniform width on the extending track, or may be a line with a gradual width change and a widening area with a different width.

In some embodiments, the total length of the radiator 10 may be 30-70mm. In some embodiments, the total length of the radiator 10 may be 50mm. It will be appreciated that the overall length of the radiator 10 can be adjusted as desired.

The radiator 10 may have a first free end 11, a second free end 12, a first feeding point 13 and a frequency selective point 14. The first feeding point 13 and the frequency selection point 14 may be located between the first free end 11 and the second free end 12. The first feeding point 13 may be located between the first free end 11 and the frequency selection point 14, and located on a side of the frequency selection point 14 away from the second free end 12.

In some embodiments, the two ends of the radiator 10, such as the first free end 11 and the second free end 12, may each have a gap between the other components. In some scenarios, when the antenna assembly 100 is applied in an electronic device, the first free end 11 and the second free end 12 of the radiator 10 may not be easily held or blocked at the same time with gaps (i.e., two gaps) respectively between other components in the electronic device. Even if one of the two slots is blocked, the radiator 10 can transmit and receive electromagnetic wave signals, so that the antenna assembly 100 can have better communication performance when applied to electronic equipment.

Referring to fig. 2, the radiator 10 may have a linear shape. The first free end 11 and the second free end 12 may be opposite ends of the radiator 10. In other embodiments, the radiator 10 may be bent. The first free end 11 and the second free end 12 may not be opposed in a straight direction. The first free end 11 and the second free end 12 may be both ends of the radiator 10. In some embodiments, the distance between the first free end 11 and the second free end 12 on the extended trajectory of the radiator 10 may be the total length of the radiator 10.

Referring to fig. 2, the first feed 20 may be indirectly connected to the first feeding point 13 through the first frequency selection circuit 30. The first feed 20 may excite the radiator 10 to support multiple frequency bands (e.g., part or all of at least one of the WiFi frequency bands, the NR frequency bands). In some embodiments, the first feed 20 may excite the radiator 10 to support the first frequency band and the second frequency band.

In some embodiments, the first frequency band may be a medium-high frequency band or a low frequency band.

In some embodiments, the first frequency band may be a WiFi frequency band or an NR frequency band.

In some embodiments, the first frequency band may be a WiFi frequency band. In some embodiments, the first frequency band may be a WiFi5G frequency band.

In some embodiments, the first feed 20 may excite a radiating portion of the radiator 10 located between the first free end 11 and the first feed point 13 to produce a first resonant mode supporting the first frequency band.

In some embodiments, the first resonant mode is an inverted F Antenna (IFA, inverted-F Antenna) mode. In some embodiments, the first resonant mode is an IFA antenna mode of 1/4 wavelength.

In some embodiments, the current of the first resonant mode comprises a current I1 flowing from the first feed point 13 to the first free end 11.

In some embodiments, the second frequency band may be a medium-high frequency band or a low frequency band.

In some embodiments, the second frequency band may be a WiFi frequency band or an NR frequency band.

In some embodiments, the second frequency band may be an NR high frequency band. In some embodiments, the second frequency band may be the N78 frequency band (3.4 GHz-3.6 GHz).

In some embodiments, the first feed 20 may excite a radiating portion of the radiator 10 located between the first free end 11 and the frequency selective point 14 to generate a second resonant mode supporting the second frequency band.

In some embodiments, the second resonant mode may be a left-hand antenna mode (a mode of a composite left-hand transmission line structure). In some embodiments, the second resonant mode may be a 1/4 wavelength left-hand antenna mode.

In some embodiments, the current of the second resonant mode comprises a current I2 flowing from the frequency selective point 14 to the first free end 11.

Referring to fig. 2, the first frequency selection circuit 30 is electrically connected between the first feeding point 13 and the first feed source 20. That is, the first feed 20 may be electrically connected to the first feed point 13 through the first frequency selection circuit 30. The first frequency selection circuit 30 may be directly grounded, so that the current I1 supporting the first frequency band may flow through the first frequency selection circuit 30 from ground to be input to the radiator 10.

In some embodiments, the first frequency selection circuit 30 may be comprised of a switch control circuit and/or a load circuit, or may be comprised of an adjustable capacitance (which may also be replaced by a fixed value capacitance) and/or an adjustable inductor. In an embodiment, the switch control circuit may be a switch chip with a switch function, or may be a single pole multiple throw switch or a single pole single throw switch.

Referring to fig. 3, fig. 3 is a schematic diagram illustrating a configuration of the first feed 20 and the first frequency selection circuit 30 in the embodiment shown in fig. 2. The first frequency selection circuit 30 may include a first matching circuit 31 and a first filter circuit 32. One end of the first matching circuit 31 is connected to the first feed source 20, the other end is indirectly connected to the first feed point 13 through the first filter circuit 32, and the other end is grounded.

In some embodiments, the first matching circuit 31 may include a second capacitor C2 with one end grounded and a first capacitor C1 with one end electrically connected to the other end of the second capacitor C2. The other end of the first capacitor C1 is electrically connected to the first feeding point 13. The other end of the second capacitance C2 may also be electrically connected to the first feed 20.

In some embodiments, the second capacitor C2 and the first capacitor C1 can flow the current I1 when the radiator 10 supports the first frequency band. Specifically, the current I1 may flow from ground through the second capacitor C2, the first capacitor C1, and to the first feeding point 13. The second capacitor C2 can be a virtual ground point.

In some embodiments, the capacitance of the second capacitor C2 may be 1pF.

In some embodiments, the first filter circuit 32 may control the first frequency selective circuit 30 to be in a low impedance state when the first feed 20 excites the radiator 10 and to be in a high impedance state when the second feed 40 excites the radiator 10. In some embodiments, the first filter circuit 32 may control the first frequency selective circuit 30 to be in a short circuit state when the first feed 20 excites the radiator 10 and to be in an open circuit state when the second feed 40 excites the radiator 10. In some embodiments, the first filter circuit 32 may control the first frequency selective circuit 30 to be on when the first feed 20 excites the radiator 10 and off when the second feed 40 excites the radiator 10.

In some embodiments, the first filter circuit 32 may include a third capacitor C3 electrically connected between the first feeding point 13 and the first matching circuit 31, e.g., the first capacitor C1, and a first inductor L1 electrically connected between the first feeding point 13 and the first matching circuit 31, e.g., the first capacitor C1. That is, the first feeding point 13 may be electrically connected to the first matching circuit 31, for example, the first capacitor C1, through the third capacitor C3 and the first inductor L1, respectively.

In some embodiments, one end of the third capacitor C3 and the first inductor L1, which are electrically connected to the first matching circuit 31, are electrically connected to one end of the first capacitor C1. The third capacitor C3 and the first inductor L1 are in parallel resonance to form a low-resistance high-pass filter circuit. That is, the first filter circuit 32 may be a low-resistance high-pass filter circuit, improving isolation between the first feed 20 and the second feed 40.

In some embodiments, the third capacitor C3 may circulate the current I1 when the radiator 10 supports the first frequency band. Specifically, the current I1 may flow through the first matching circuit 31 (e.g., the second capacitor C2, the first capacitor C1), the third capacitor C3 and to the first feeding point 13.

Referring to fig. 2, the second feed 40 may be indirectly connected to the frequency selective point 14 through a second frequency selective circuit 50. The second feed 40 may excite the radiator 10 to produce a resonant mode supporting multiple frequency bands (e.g., part or all of at least one of a mid-high frequency band, a low frequency band), widening the bandwidth of the antenna assembly 100. It will be appreciated that the frequency selective point 14 may also be referred to as a "second feed point".

Referring to fig. 2, the second frequency selecting circuit 50 is electrically connected between the frequency selecting point 14 and the second feed source 40. That is, the second feed 40 may be electrically connected to the frequency bin 14 through the second frequency selective circuit 50. The second frequency selection circuit 50 may be directly grounded, so that the current I2 supporting the second frequency band may flow from ground through the second frequency selection circuit 50 to be input to the radiator 10.

In some embodiments, the second frequency selection circuit 50 may be comprised of a switch control circuit and/or a load circuit, or may be comprised of an adjustable capacitance (which may also be replaced by a fixed value capacitance) and/or an adjustable inductor.

Referring to fig. 4, fig. 4 is a schematic diagram illustrating a configuration of the second feed 40 and the second frequency selection circuit 50 in the embodiment shown in fig. 2. The second frequency selection circuit 50 may include a second matching circuit 51 and a second filter circuit 52. The second matching circuit 51 is electrically connected between the frequency selective point 14 and the second feed source 40, so that the second feed source 40 is electrically connected with the frequency selective point 14 through the second matching circuit 51. The second filter circuit 52 is electrically connected between the second matching circuit 51 and ground, so that the second matching circuit 51 is grounded through the second filter circuit 52.

In some embodiments, the second matching circuit 51 may include a fourth capacitance C4 electrically connected between the frequency selective point 14 and the second feed 40. Further, the second feed 40 is electrically connected to the frequency selector 14 through the fourth capacitor C4. In some embodiments, the second matching circuit 51, e.g., the fourth capacitor C4, is arranged such that the second resonant mode is a left-hand antenna mode employing a capacitively coupled feed to form a composite left-hand transmission line structure.

In some embodiments, the capacitance of the fourth capacitor C4 may be 2.7pF.

In some embodiments, the second filter circuit 52 may control the second frequency selective circuit 50 to be in a high impedance state when the first feed 20 excites the radiator 10 and to be in a low impedance state when the second feed 40 excites the radiator 10. In some embodiments, the second filter circuit 52 may control the second frequency selective circuit 50 to be in an open state when the first feed 20 excites the radiator 10 and to be in a short state when the second feed 40 excites the radiator 10. In some embodiments, the second filter circuit 52 may control the second frequency selective circuit 50 to be turned off when the first feed 20 excites the radiator 10 and to be turned on when the second feed 40 excites the radiator 10.

In some embodiments, the second filter circuit 52 may include a fifth capacitor C5 electrically connected to the second matching circuit 51, for example, between the fourth capacitor C4 and ground. Further, the second matching circuit 51 is grounded through the fifth capacitor C5, for example, the fourth capacitor C4. The fifth capacitor C5 may constitute a low-pass high-resistance filter circuit. That is, the second filter circuit 52 may be a low-pass high-resistance filter circuit that increases the isolation between the first feed 20 and the second feed 40.

In some embodiments, the fifth capacitor C5 is electrically connected to the second matching circuit 51 and the second feed 40, respectively.

In some embodiments, the capacitance of the third capacitor C3 is 2.7pF.

In some embodiments, the fifth capacitor C5 may flow the current I2 when the radiator 10 supports the second frequency band. Specifically, the current I2 may flow from ground through the fifth capacitor C5, the second matching circuit 51, e.g., the fourth capacitor C4, and to the first feeding point 14. The fifth capacitor C5 can be a virtual ground point.

In one embodiment, referring to fig. 5, fig. 5 is a schematic diagram of an antenna assembly 100 shown in fig. 2 in another embodiment. The secondary feed 40 may be omitted. Further, in some scenarios, the first filter circuit 32 may be omitted, and the first matching circuit 31 is directly electrically connected to the first feeding point 13. In some scenarios, the second matching circuit 51 may be omitted, and the second filtering circuit 52 is directly electrically connected to the frequency bin 14. In some scenarios, the second filter circuit 52 may be omitted, with the second matching circuit 51 being directly grounded. In some scenarios, the total length of the radiator 10 may be adjusted to eliminate the radiating portion between the frequency selective point 14 and the second free end 12.

Referring to fig. 6, fig. 6 is a schematic structural diagram of the antenna assembly 100 shown in fig. 2 in another embodiment. The radiator 10 has a ground point 15 thereon. The ground point 15 may be located between the frequency selective point 14 and the second free end 12. The ground point 15 may be directly grounded or indirectly grounded through a tuning circuit. The tuning circuit may consist of a switch control circuit and/or a load circuit, or of an adjustable capacitance (which may also be replaced by a fixed capacitance) and/or an adjustable inductor.

In some embodiments, the second feed 40 may excite a radiating portion of the radiator 10 located between the first free end 11 and the ground point 15 to produce a third resonant mode supporting a third frequency band. In some scenarios, the overall length of the radiator 10 may be adjusted to eliminate the radiating portion between the ground point 15 and the second free end 12.

In some embodiments, the third frequency band may be a long term evolution (Long Term Evolution, LTE) enabled frequency band. In some embodiments, the third frequency band may be an LTE low frequency band. In some embodiments, the third frequency band may be the LTE B20 frequency band (791 MHz-861 MHz).

In some embodiments, the third resonant mode may be a left-hand antenna mode. The current I3 of the third resonance mode may flow from the ground point 15 to the first free end 11.

Referring to fig. 7, fig. 7 is a schematic structural diagram of the antenna assembly 100 shown in fig. 6 in another embodiment. The radiator 10 may also have a third feeding point 16 located between the second free end 12 and the ground point 15.

The antenna assembly 100 may also include a third feed 60. The third feed 60 may be directly or indirectly electrically connected to the third feed point 16. The third feed 60 may excite the radiator 10. The third feed 60 may energize the radiator 10 to produce a portion or all of the support for at least one of the multiple frequency bands, e.g., the mid-high frequency band, the low frequency band, widening the bandwidth of the antenna assembly 100. It can be appreciated that the arrangement of the grounding point 15 improves the isolation between the third feed source 60 and the first and second feeds 20, 40, respectively.

In some embodiments, the third feed 60 may excite a radiating portion of the radiator 10 located between the ground point 15 and the second free end 12 to produce a fourth resonant mode supporting a fourth frequency band. In some scenarios, the number of the grounding points 15 between the frequency selection point 14 and the third feeding point 16 may be a plurality of, for example, 2, 3, 4, etc., and thus the grounding point 15 matching the third resonance mode may be two different grounding points than the grounding point 15 matching the fourth resonance mode, so as to improve the isolation between the third feeding source 60 and the first feeding source 20 and the second feeding source 40 respectively.

In some embodiments, the fourth frequency band may be a medium-high frequency band (1710 MHz-2690 MHz). In some embodiments, the fourth frequency band may be a high frequency band in LTE. In some embodiments, the fourth frequency band may be at least one of an LTE B3 frequency band, an LTE B1 frequency band, an LTE B39 frequency band, an LTE B40 frequency band, or an LTE B41 frequency band.

In some embodiments, the fourth resonant mode is a left-hand antenna mode.

In some embodiments, the current of the fourth resonant mode may include a current I4 flowing from ground 15 to the second free end 12.

Referring to fig. 7, the antenna assembly 100 may further include a third frequency selection circuit 70. The third frequency selective circuit 70 is electrically connected between the third feed point 16 and the third feed source 60 such that the third feed source 60 is electrically connected to the third feed point 16 through the third frequency selective circuit 70.

Referring to fig. 8, fig. 8 is a schematic diagram illustrating a configuration of the third feed 60 and the third frequency selection circuit 70 in the embodiment shown in fig. 7. The third frequency selection circuit 70 may consist of a switch control circuit and/or a load circuit, or may consist of an adjustable capacitance (which may also be replaced by a fixed value capacitance) and/or an adjustable inductor.

In some embodiments, the third frequency selective circuit 70 may include a sixth capacitance C6 electrically connected between the third feed point 16 and the third feed 60. Further, the third feed 60 is electrically connected to the third feed point 16 through a sixth capacitor C6. In some embodiments, the third frequency selective circuit 70, e.g., the sixth capacitor C6, is arranged such that the fourth resonant mode is a left-hand antenna mode employing a capacitively coupled feed to form a composite left-hand transmission line structure.

Referring to fig. 9, fig. 9 is a schematic structural diagram of the antenna assembly 100 shown in fig. 7 in another embodiment. The radiator 10 may also have a switching point 17 located between the second free end 12 and the third feed point 16.

The antenna assembly 100 may also include a switching circuit 80 electrically connected between the switching point 17 and ground. The switching point 17 is grounded through a switching circuit 80. The switching circuit 80 may adjust the frequency of the fourth frequency band.

The switching circuit 80 may switch between the plurality of sub-bands in the fourth band. For example, the switching circuit 80 may switch between LTE B3 band, LTE B1 band, LTE B39 band, LTE B40 band, and LTE B41 band in the fourth band.

The switching circuit 80 may be comprised of a switch control circuit and/or a load circuit, or may be comprised of an adjustable capacitance (which may also be replaced by a fixed capacitance) and/or an adjustable inductor.

Referring to fig. 10, fig. 10 is a schematic diagram illustrating a configuration of the switching circuit 80 shown in fig. 9 according to some embodiments. The switching circuit 80 may comprise a switch 81 and at least one frequency selective branch 82.

The changeover switch 81 has a common terminal 811 electrically connected to the changeover point 17, a plurality of connection terminals 812, and a changeover portion 813. The switching part 813 may be electrically connected to the common terminal 811. The switching portion 813 may be electrically connected to one connection 812 under control of a control signal (which may be from an electronic device such as a processor or other electronic device).

One end of each frequency selective branch 82 is electrically connected to a connection end 812 in a one-to-one correspondence, and the other end is grounded.

Referring to fig. 10, the switching portion 813 can be selectively electrically connected to different connection ends 812, so that one end of the different frequency selection branches 82 is electrically connected to the third feeding point 16, and the other end is grounded, so that the radiating portion of the radiator 10 between the grounding point 15 and the second free end 12 has different effective electrical lengths in different states.

It should be understood that the illustrated number of frequency selective branches 82 in the illustrations should not be construed as limiting the number of frequency selective branches 82 provided by embodiments of the present application.

In some embodiments, each frequency selective branch 82 may include a capacitance, or an inductance, or a combination of capacitance and inductance.

In an embodiment, when the frequency selective branches 82 are plural, each frequency selective branch 82 may be different, so that the degree of adjustment to the electrical length of the radiator 10 is different when different frequency selective branches 82 are electrically connected to the radiator 10. Further, the frequency selection is switched between a plurality of sub-bands in the fourth band, for example, LTE B3 band, LTE B1 band, LTE B39 band, LTE B40 band, LTE B41 band, and the like.

It should be noted that, the frequency selective branches 82 are different, and the devices included in each frequency selective branch 82 may be different; or the included devices are the same, but the connection relation between the devices is different; or the devices included are identical and the connection relationship is identical, but the parameters (such as capacitance, or inductance) of the devices are different.

In addition, since the radiator 10 supports more sub-bands in the fourth frequency band, the number of frequency selective branches 82 is generally greater than or equal to two in order to achieve better adjustment of the LB frequency band.

It should be understood that the number of the switches 81 in fig. 10 may be plural, and each frequency selecting branch 82 is electrically connected to one switch 81 in a one-to-one correspondence manner. Referring to fig. 11, fig. 11 is a schematic diagram of a structure of the switching circuit 80 in another embodiment of the antenna assembly 100 in the embodiment shown in fig. 10. Each frequency selective branch 82 is electrically connected to one of the switching switches 81 in a one-to-one correspondence.

In addition, in fig. 10, the grounded end of the switch 81 may be electrically connected to the switching point 17, and accordingly, the end electrically connected to the switching point 17 may be directly grounded.

In some embodiments, frequency selective branch 82 may include a first frequency selective branch 821, a second frequency selective branch 822, a third frequency selective branch 823, and a fourth frequency selective branch 824. Wherein, one end of each of the first frequency-selecting branch 821, the second frequency-selecting branch 822, the third frequency-selecting branch 823 and the fourth frequency-selecting branch 824 is electrically connected to one connecting end 812, and the other ends are grounded.

In some embodiments, first frequency selective branch 821 may be a capacitor. In some embodiments, the second frequency selective branch 822, the third frequency selective branch 823, and the fourth frequency selective branch 824 may all be inductive.

In an embodiment, referring to fig. 10 and 11, taking the LTE B3 band, the LTE B1 band, the LTE B39 band, the LTE B40 band, and the LTE B41 band as examples, when the frequency is selected by the first frequency selecting branch 821, the second frequency selecting branch 822, the third frequency selecting branch 823, and the fourth frequency selecting branch 824, the following table is shown:

Referring to fig. 12, fig. 12 is a schematic structural diagram of the antenna assembly 100 shown in fig. 9 in another embodiment. The switching point 17 may coincide with the third feeding point 16. That is, the switching point 17 may be the same point as the third feeding point 16.

Referring to fig. 13, fig. 13 is a schematic structural diagram of the antenna assembly 100 shown in fig. 9 in another embodiment. Wherein the first resonant mode corresponding to the current I1 is operable in the WiFi5G frequency band. The second resonant mode corresponding to current I2 is operable in the N78 band (3.4 GHz-3.6 GHz). The third resonant mode, corresponding to current I3, is operable in the B20 band (791 MHz-861 MHz). The fourth resonant mode corresponding to the current I4 may operate in a high frequency band in LTE such as LTE B3 band, LTE B1 band, LTE B39 band, LTE B40 band, LTE B41 band. Further, the antenna assembly 100 may implement an ENDC (dual connectivity (E-UTRAN new radio-Dual Connectivity, abbreviated as ENDC) combination of the N78 band and the WiFi5G band, or an ENDC of the LTE B20 band and the middle-high frequency band (e.g., one of the LTE middle-high frequency bands such as the LTE B3 band, the LTE B1 band, the LTE B39 band, the LTE B40 band, the LTE B41 band, etc.).

Because the current path of the current I4 is not overlapped with the current path of the current I1 and the current path of the current I2, the high-isolation performance exists between the middle-high frequency band and the N78 frequency band, and the high-isolation performance exists between the middle-high frequency band and the WiFi5G frequency band.

The application adopts the scheme of sharing the radiator 10, so that the radiator 10 works in the N78 frequency band+WiFi 5G frequency band, the LTE B20 frequency band, the MHB frequency band and the like, and the probability of occurrence of isolation/coexistence problems is reduced. By sharing the radiator 10, the need for design space for the antenna assembly is reduced.

In some embodiments, referring to fig. 14, fig. 14 is a graph of return loss of the antenna assembly 100 of fig. 13 excited by the first feed 20 in another embodiment, with frequency (GHz) on the horizontal axis and return loss (dB) on the vertical axis. Curve A1 is the return loss curve of the antenna assembly 100 under the first feed 20. Wherein the curve A has a first mark point (3.4959-9.1758), a second mark point (5.4985-11.998) and a third mark point (4.8473-3.9138). It can be seen that the antenna assembly 100 has good antenna performance in the second frequency band, such as the N78 frequency band, near the first identification point, and good antenna performance in the first frequency band, such as the WiFi5G frequency band, near the second identification point and the third identification point, and in addition, the bandwidth between the first identification point and the second identification point is wider, so that the working state of the antenna assembly 100 is good, and the engineering requirement can be satisfied.

In some embodiments, referring to fig. 15, fig. 15 is a graph of the overall system efficiency (System Total Efficiency) of the antenna assembly 100 of fig. 13 excited by the first feed 20 in another embodiment. The horizontal axis is frequency (GHz) and the vertical axis is system total efficiency (dB). Curve A2 is the overall efficiency curve of the system for the antenna assembly 100 under the first feed 20. Wherein the curve A2 has a first marking point (3.339-6.5254), a second marking point (5.3513-3.8698) and a third marking point (5.6551-3.71). It can be seen that the antenna assembly 100 has good antenna performance in the first frequency band (e.g. WiFi5G frequency band) and the second frequency band (e.g. N78 frequency band), so that the working state is good, and the engineering requirements can be satisfied.

In some embodiments, referring to fig. 16, fig. 16 is a graph of return loss of the antenna assembly 100 of fig. 13 excited by the second feed 40 in another embodiment, with frequency (GHz) on the horizontal axis and return loss (dB) on the vertical axis. Curve B1 is the return loss curve of the antenna assembly 100 under the second feed 40. Wherein a first identification point (0.83997, -13.976) is provided on the curve A. As can be seen, the antenna performance of the antenna assembly 100 on the third frequency band, such as the LTE B20 frequency band, near the first identification point is good, and thus the working state of the antenna assembly 100 is good, which can meet the engineering requirements.

In some embodiments, referring to fig. 17, fig. 17 is a graph of the overall system efficiency of the antenna assembly 100 of fig. 13 excited by the second feed 40 in another embodiment. The horizontal axis is frequency (GHz) and the vertical axis is system total efficiency (dB). Curve B2 is the overall efficiency curve of the system for the antenna assembly 100 under the second feed 40. Wherein the curve B2 has a first marking point (0.87411-13.215), a second marking point (0.81529-12.964) and a third marking point (0.83987-9.9632). As can be seen, the antenna performance of the antenna assembly 100 on the third frequency band, such as the LTE B20 frequency band, near the first identification point is good, and thus the working state of the antenna assembly 100 is good, which can meet the engineering requirements.

In some embodiments, referring to fig. 18, fig. 18 is a graph of return loss of the antenna assembly 100 of fig. 13 excited by the third feed 60 in another embodiment, with frequency (GHz) on the horizontal axis and return loss (dB) on the vertical axis. Curve C1 is a return loss curve of the antenna assembly 100 corresponding to the LTE B1 band in one embodiment. Curve D1 is a return loss curve of the antenna assembly 100 corresponding to the LTE B3 band in one embodiment. Curve E1 is a return loss curve of the antenna assembly 100 corresponding to the LTE B40 band in one embodiment. Curve F1 is a return loss curve of the antenna assembly 100 corresponding to the LTE B41 band in one embodiment. The curve C1 has a first identification point (2.032, -14.754). The curve D1 has a second identification point (1.7957, -12.746). The curve E1 has a third identified point (2.3516, -24.803). The curve F1 has a fourth identified point (2.5755, -20.694). As can be seen, the antenna assembly 100 has good antenna performance in the fourth frequency band (e.g., LTE B3 frequency band, LTE B1 frequency band, LTE B40 frequency band, LTE B41 frequency band), so that the working state is good, and the engineering requirements can be satisfied.

In some embodiments, referring to fig. 19, fig. 19 is a graph of the overall system efficiency (dB) of the antenna assembly 100 of fig. 13 excited by the third feed 60 in another embodiment, with the horizontal axis being frequency (GHz) and the vertical axis being the overall system efficiency (dB). Curve C2 is a system overall efficiency curve of the antenna assembly 100 corresponding to the LTE B1 band in one embodiment. Curve D2 is a system overall efficiency curve of the antenna assembly 100 corresponding to the LTE B3 band in one embodiment. Curve E2 is a system overall efficiency curve of the antenna assembly 100 corresponding to the LTE B40 band in one embodiment. Curve F2 is a system overall efficiency curve of the antenna assembly 100 corresponding to the LTE B41 band in one embodiment. The curve C2 has a first identified point (2.0079, -4.7104). The curve D2 has a second identification point (1.7967, -4.29). The curve E2 has a third identified point (2.3721, -4.3092). The curve F2 has a fourth identification point (2.61, -4.0987). As can be seen, the antenna assembly 100 has good antenna performance in the fourth frequency band (e.g., LTE B3 frequency band, LTE B1 frequency band, LTE B40 frequency band, LTE B41 frequency band), so that the working state is good, and the engineering requirements can be satisfied.

Next, an electronic device to which the antenna assembly 100 of the above-described embodiment can be mounted will be described. The electronic device may be any of a number of electronic devices including, but not limited to, cellular telephones, smart phones, other wireless communication devices, personal digital assistants, audio players, other media players, music recorders, video recorders, cameras, other media recorders, radios, medical devices, calculators, programmable remote controls, pagers, netbooks, personal Digital Assistants (PDAs), portable Multimedia Players (PMPs), moving picture experts group (MPEG-1 or MPEG-2), audio layer 3 (MP 3) players, portable medical devices, and digital cameras, combinations thereof, and the like.

In some embodiments, the electronic device may include, but is not limited to, an electronic device with communication functions such as a mobile phone, an internet device (MID), an electronic book, a portable play station (Play Station Portable, PSP), or a personal digital assistant (personal DIGITAL ASSISTANT, PDA).

Referring to fig. 20, fig. 20 is an exploded view of an electronic device according to an embodiment of the application, the electronic device 200 may include a middle frame assembly 90 provided with an antenna assembly 100, a display 201 disposed on one side of the middle frame assembly 90 for displaying information, a battery cover 202 connected to the other side of the middle frame assembly 90, a circuit board 203 mounted on the middle frame assembly 90 for controlling the display 201 and the antenna assembly 100, and a battery 204 mounted on the middle frame assembly 90 for supplying power for normal operation of the electronic device 200.

The display 201 may be a Liquid crystal display (Liquid CRYSTAL DISPLAY, LCD) or an Organic Light-Emitting Diode (OLED) display, etc. for displaying information and images.

The material of the middle frame assembly 90 may be a metal such as magnesium alloy, aluminum alloy, stainless steel, etc., but the material is not limited thereto, and may be other insulating materials such as hard materials. The middle frame assembly 90 may be interposed between the display 201 and the battery cover 202. The middle frame assembly 90 may be used to carry a display screen 201. The middle frame assembly 90 is snap-fit connected with the battery cover 202 to form a main housing 210 of the electronic device 200, and a receiving cavity is formed inside the main housing 210. The receiving cavity may be used to receive electronic components such as a camera, a circuit board 203, a battery 204, a processor (disposed on the circuit board 203 and, therefore, may be part of the circuit board 203 in some embodiments), the antenna assembly 100, and various types of sensors in the electronic device 200.

The circuit board 203 is installed in the accommodating chamber, and can be installed at any position in the accommodating chamber. The circuit motherboard 203 may be a motherboard of the electronic device 200. The processor of the electronic device 200 may be provided on the circuit motherboard 203. One, two or more of the functional components such as a motor, a microphone, a speaker, a receiver, an earphone interface, a universal serial bus interface (USB interface), a camera, a distance sensor, an ambient light sensor, and a gyroscope may be integrated on the circuit board 203. Meanwhile, the display screen 201 may be electrically connected to the circuit board 203.

The battery 204 is mounted in the receiving cavity and may be mounted anywhere within the receiving cavity. The battery 204 may be electrically connected to the circuit motherboard 203 to enable the battery 204 to power the electronic device 200. The circuit motherboard 203 may have a power management circuit disposed thereon. The power management circuit is used to distribute the voltage provided by the battery 204 to various electronic components in the electronic device 200, such as the display 201.

The battery cover 202 may be made of the same material as the middle frame assembly 90, although other materials may be used. The battery cover 202 may be integrally formed with the middle frame assembly 90. In some embodiments, battery cover 202 may wrap around middle frame assembly 90, and may carry display 201. The battery cover 202 may have a rear camera hole, a fingerprint recognition module mounting hole, and the like.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Referring to fig. 20 and 21, fig. 21 is a schematic structural diagram of a frame assembly 90 in the embodiment shown in fig. 20. The middle frame assembly 90 may include a substrate 91 for carrying a display screen 201 and a bezel 92 surrounding the substrate 91. Wherein the substrate 91 is disposed opposite to the battery cover 202. The bezel 92 may be adapted for snap-fit connection with the battery cover 202. That is, the substrate 91, the frame 92, and the battery cover 202 define a housing chamber.

The substrate 91 may be a conductive metal, but may be other materials. A ground plane and a feed source may be provided on the substrate 91. The ground plane acts as ground. In some embodiments, the ground plane and feed may not be disposed on the substrate 91, but directly on the circuit motherboard 203. In some embodiments, the substrate 91 may be omitted.

The bezel 92 may be a conductive metal, so the bezel 92 may also be referred to as a "metal bezel". Of course, the frame 92 may be made of other materials, such as an insulating material. The frame 92 may be made of the same material as the substrate 91. The frame 92 may include a first frame 921, a second frame 922, a third frame 923, and a fourth frame 924 connected end to end in sequence. The first frame 921, the second frame 922, the third frame 923, and the fourth frame 924 are disposed around the substrate 91 and can be connected and fixed to the substrate 91. In some embodiments, the bezel 92 may be of unitary construction with the battery cover 202. For example, the frame 92 extends from the edge of the battery cover 202 to the display 201 to be fastened to the display 201.

In some embodiments, the first bezel 921, the second bezel 922, the third bezel 923, and the fourth bezel 924 enclose a rounded rectangle. Of course, other shapes such as circular, triangular, etc. are also possible. In some embodiments, the first frame 921 is disposed opposite the third frame 923, and the second frame 922 is disposed opposite the fourth frame 924.

In some embodiments, the lengths of both the first frame 921 and the third frame 923 are shorter than the length of the second frame 922 and shorter than the length of the fourth frame 92.

It will be appreciated that the center assembly 90 and the battery cover 202 may comprise the main housing 210. In some embodiments, the main housing may not be limited to the middle frame assembly 90 and the battery cover 202, but may include other components, which are not described in detail.

Please refer to fig. 21. The antenna assembly 100 may be mounted on the center frame assembly 90. In some embodiments, the antenna assembly 100 may be part of the middle frame assembly 90. Of course, in some embodiments, the antenna assembly 100 may also be mounted in other locations of the main housing 210, such as on the battery cover 202. In some embodiments, the antenna assembly 100 may be machined from the main housing 210. For example, the antenna assembly 100 appears as a slot antenna. In some embodiments, the antenna assembly 100 may be directly secured to the main housing 210.

The radiator 10 is arranged at a frame 92, for example a first frame 921.

In an embodiment, the first feed 20, the second feed 40 may be feeds on the substrate 91 or the circuit motherboard 203. The radiator 10 can be connected with the feed source through the antenna spring plate.

In one embodiment, the ground may be a ground plane on the substrate 91 or the circuit motherboard 203. The radiator 10 can be connected with the ground through the antenna spring.

A slit 901 is provided between the first frame 921 and the substrate 91. The slit 901 may be extended toward the second frame 922 and the fourth frame 924 in the extending direction of the first frame 921, so as to be formed between the first frame 921 and the substrate 91, for example, a ground plane, and a part or all of the first frame 921 may serve as the radiator 10.

In some embodiments, the slit 901 may extend toward the second frame 922 in the extending direction of the first frame 921, so as to form between the second frame 922 and the substrate 91, for example, a ground plane.

In some embodiments, the slit 901 may be extended toward one side of the fourth frame 924 in the extending direction of the first frame 921, so as to form between the fourth frame 924 and the substrate 91, for example, a ground plane.

The radiator 10 of the present application uses the first frame 921, so that the performance loss of the antenna assembly 100 by a human hand can be effectively improved.

It is understood that in order to secure the connection strength between the substrate 91 and the frame 92, for example, the first frame 921, the radiator 10. An insulating material, such as a resin, may be filled between the gaps 901 to realize that the radiator 10 in the antenna assembly 100 is a part of the frame 92, such as the first frame 921, and further improve the appearance of the electronic device 200.

The application adopts the scheme of sharing the radiator, reduces the probability of occurrence of isolation/coexistence problems, ensures that the total system efficiency of the antenna assembly 100 is good, reduces the requirement of the antenna assembly 100 on the design space of the electronic equipment 200, and has important engineering application benefits.

Next, referring to fig. 22, fig. 22 is a schematic structural diagram of an electronic device 300 according to an embodiment of the application. The electronic device 300 may be a mobile phone, a tablet computer, a notebook computer, a wearable device, etc. The present embodiment is illustrated using a mobile phone as an example. The structure of the electronic device 300 may include RF circuitry 310 (e.g., the antenna assembly 100 in the above-described embodiments), memory 320, input unit 330, display unit 340 (e.g., the display 201 in the above-described embodiments), sensor 350, audio circuitry 360, wiFi module 370, processor 380, and power supply 390 (e.g., the battery 204 in the above-described embodiments), among others. The RF circuit 310, the memory 320, the input unit 330, the display unit 340, the sensor 350, the audio circuit 360, and the WiFi module 370 are respectively connected to the processor 380. The power supply 390 is used to provide power to the entire electronic device 300.

Specifically, RF circuit 310 is used to send and receive signals. Memory 320 is used to store data instruction information. The input unit 330 is used for inputting information, and may specifically include a touch panel 3301 and other input devices 3302 such as operation keys. The display unit 340 may include a display panel 3401 and the like. The sensor 350 includes an infrared sensor, a laser sensor, a position sensor, etc., for detecting a user proximity signal, a distance signal, etc. The speaker 3601 and the microphone (or microphone, or receiver assembly) 3602 are coupled to the processor 380 through the audio circuit 360 for receiving sound signals. The WiFi module 370 is configured to receive and transmit WiFi signals. The processor 380 is used for processing data information of the electronic device.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described device embodiments are merely illustrative, e.g., the division of modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The foregoing description is only illustrative of the present application and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present application.

Claims

1. An antenna assembly, comprising:

2. The antenna assembly of claim 1, wherein the radiator has a ground point thereon, the frequency selection point being located between the ground point and the first feed point, the ground point being grounded, the antenna assembly further comprising:

The second feed source is used for exciting the radiator, and the second frequency selection circuit is electrically connected between the frequency selection point and the second feed source, so that the second feed source is electrically connected with the frequency selection point through the second frequency selection circuit.

3. The antenna assembly of claim 2, wherein the first frequency selective circuit comprises:

A first filter circuit electrically connected to the first feed point; and

The first matching circuit is electrically connected between the first filtering circuit and the first feed source, so that the first feed source is electrically connected with the first filtering circuit through the first matching circuit, the first matching circuit is grounded, current supporting the first frequency band is configured to flow through the first matching circuit from the ground, the first filtering circuit is used for inputting the radiator, and the first filtering circuit is configured to be disconnected when the second feed source excites the radiator and connected when the first feed source excites the radiator.

4. The antenna assembly of claim 3, wherein the first matching circuit comprises:

A first capacitor electrically connected between the first filter circuit and the first feed source so that the first feed source is electrically connected with the first filter circuit through the first capacitor,

And the second capacitor is electrically connected between the first capacitor and the ground, so that the first capacitor is grounded through the second capacitor, and the current supporting the first frequency band is configured to flow through the second capacitor and the first capacitor from the ground to be input into the radiator.

5. The antenna assembly of claim 4, wherein the second capacitor has a capacitance of 1pF.

6. The antenna assembly of claim 3, wherein the first filter circuit comprises:

A third capacitor electrically connected between the first matching circuit and the first feeding point, so that the first matching circuit is electrically connected with the first feeding point through the third capacitor, and a current supporting the first frequency band is configured to flow through the third capacitor from the ground to be input to the radiator; and

And the first inductor is electrically connected between the first matching circuit and the first feed point, so that the first matching circuit is electrically connected with the first feed point through the first inductor.

7. The antenna assembly of claim 2, wherein the second frequency selective circuit comprises:

A second matching circuit electrically connected between the frequency selection point and the second feed source so that the second feed source is electrically connected with the frequency selection point through the second matching circuit, and

And the second filter circuit is electrically connected between the second matching circuit and the ground, so that the second matching circuit is grounded through the second filter circuit, current supporting the second frequency band is configured to flow through the second filter circuit and the second matching circuit from the ground to be input into the radiator, and the second filter circuit is configured to be disconnected when the first feed source excites the radiator and to be connected when the second feed source excites the radiator.

8. The antenna assembly of claim 7, wherein the second matching circuit comprises:

And the fourth capacitor is electrically connected between the frequency selection point and the second feed source so that the second feed source is electrically connected with the frequency selection point through the fourth capacitor.

9. The antenna assembly of claim 7, wherein the second filter circuit comprises:

And a fifth capacitor electrically connected between the second matching circuit and ground, so that the second matching circuit is grounded through the fifth capacitor, current supporting the second frequency band is configured to flow through the fifth capacitor from ground to input the radiator, and the fifth capacitor is configured to be turned off when the first feed source excites the radiator and turned on when the second feed source excites the radiator.

10. The antenna assembly of claim 9, wherein the fifth capacitance has a capacitance of 4pF.

11. The antenna assembly of any one of claims 1-10, wherein the first feed is configured to excite a radiating portion of the radiator located between the first feed point and the first free end to produce a first resonant mode supporting the first frequency band, the first resonant mode being a 1/4 wavelength inverted F antenna IFA antenna mode, currents supporting the first frequency band being configured to flow from the first feed point to the first free end.

12. The antenna assembly of claim 9, wherein the first frequency band comprises a WiFi5G frequency band.

13. The antenna assembly of any of claims 1-10, wherein the first feed is configured to excite a radiating portion of the radiator located between the frequency selection point and the first free end to generate a second resonant mode supporting the second frequency band, the second resonant mode being a 1/4 wavelength left-hand antenna mode, a current supporting the second frequency band being configured to flow from the frequency selection point to the first free end.

14. The antenna assembly of claim 13, wherein the second frequency band comprises a new air interface N78 frequency band.

15. The antenna assembly of any of claims 2-10, wherein the second feed is configured to excite a radiating portion of the radiator located between the ground point and the first free end to produce a third resonant mode supporting a third frequency band, the third resonant mode being a left-hand antenna mode, a current of the third resonant mode comprising a current flowing from the ground point to the first free end.

16. The antenna assembly of claim 15, wherein the third frequency band comprises a long term evolution, LTE, B20, frequency band.

17. The antenna assembly of any one of claims 2-10, wherein the radiator has a second free end and a third feed point thereon, the ground point being located between the frequency selection point and the second free end, the third feed point being located between the ground point and the second free end, the antenna assembly further comprising:

A third feed for exciting the radiator; and

And the third frequency selection circuit is electrically connected between the third feed point and the third feed source so that the third feed source is electrically connected with the third feed point through the third frequency selection circuit.

18. The antenna assembly of claim 17, wherein the third feed is configured to excite a radiating portion of the radiator located between the ground point and the second free end to produce a fourth resonant mode supporting a fourth frequency band, the fourth resonant mode being a left-hand antenna mode, a current of the fourth resonant mode comprising a current flowing from the ground point to the second free end.

19. The antenna assembly of claim 18, wherein the fourth frequency band comprises at least one of LTEB frequency bands, LTE B3 frequency bands, LTE B39 frequency bands, LTE B40 frequency bands, or LTE B41 frequency bands.

20. The antenna assembly of claim 17, wherein the radiator has a switching point thereon that coincides with the third feed point or is located between the third feed point and the second free end, the antenna assembly further comprising:

And the switching circuit is electrically connected between the switching point and the ground so that the switching point is grounded through the switching circuit, and the switching circuit is used for adjusting the frequency of the frequency band supported by the third feed source.

21. The antenna assembly of claim 20, wherein the switching circuit comprises:

The switching switch is provided with a plurality of connecting ends, a switching part and a common end electrically connected with the switching point, wherein the switching part is electrically connected with the common end and is configured to be electrically connected to one connecting end of the plurality of connecting ends under the control of a control signal; and

And one end of the at least one frequency selecting branch is electrically connected with the connecting ends in one-to-one correspondence, and the other end of the at least one frequency selecting branch is grounded.

22. The antenna assembly of claim 21, wherein each of the at least one frequency selective branches comprises a capacitance or an inductance.

23. An antenna assembly, comprising:

A radiator having a first free end, a second free end, a first feed point, a second feed point, a ground point, and a third feed point, the first feed point being located between the first free end and the second free end, the second feed point being located between the first feed point and the second free end, the ground point being located between the second feed point and the second free end, the third feed point being located between the ground point and the second free end;

A first feed for exciting a radiating portion of the radiator between the first feed point and the first free end to produce a first resonant mode and for exciting a radiating portion of the radiator between the second feed point and the first free end to produce a second resonant mode;

The first frequency selection circuit is electrically connected between the first feed point and the first feed source so that the first feed source is electrically connected with the first feed point through the first frequency selection circuit, and the first frequency selection circuit is grounded;

A second feed for exciting a radiating portion of the radiator located between the ground point and the first free end to produce a third resonant mode, the first frequency selective circuit being configured to be on when the first feed excites the radiator and to be off when the second feed excites the radiator;

A second frequency selective circuit electrically connected between the second feed point and the second feed source such that the second feed source is electrically connected to the second feed point through the second frequency selective circuit, the second frequency selective circuit configured to be turned off when the first feed source excites the radiator and turned on when the second feed source excites the radiator;

A third feed for exciting a radiating portion of the radiator located between the ground point and the second free end to produce a fourth resonant mode;

24. A center assembly, comprising:

A substrate provided with a ground plane;

the frame is arranged around the substrate in a surrounding mode; and

An antenna assembly as claimed in any one of claims 1 to 23, wherein the radiator is disposed on the bezel and a gap is provided between the radiator and the ground plane.

25. An electronic device, comprising:

A middle frame assembly comprising:

A substrate;

The frame is connected with the substrate, and comprises a first frame, a second frame, a third frame and a fourth frame which are connected end to end in sequence and are arranged around the substrate in a surrounding mode, wherein the first frame and the third frame are arranged oppositely, the second frame and the fourth frame are arranged oppositely, and the lengths of the first frame and the third frame are shorter than those of the second frame and shorter than those of the fourth frame;

The antenna assembly of any of claims 1-23, the radiator disposed on the first bezel;

the battery cover is arranged on one side of the middle frame assembly, is respectively connected with the first frame, the second frame, the third frame and the fourth frame, and is arranged opposite to the substrate; and

The display screen is arranged on the other side of the middle frame assembly, is respectively connected with the first frame, the second frame, the third frame and the fourth frame, and is arranged opposite to the substrate.