WO2023071521A1

WO2023071521A1 - Antenna assembly, middle frame assembly and electronic device

Info

Publication number: WO2023071521A1
Application number: PCT/CN2022/116575
Authority: WO
Inventors: 胡兴邦
Original assignee: Oppo广东移动通信有限公司
Priority date: 2021-10-29
Filing date: 2022-09-01
Publication date: 2023-05-04
Also published as: CN116073108A

Abstract

The present application relates to the technical field of communications. Disclosed are an antenna assembly, a middle frame assembly and an electronic device. The antenna assembly comprises a first radiation branch, a second radiation branch and a parasitic branch. The first radiation branch is provided with a feed point and a first grounding point, wherein the feed point can be electrically connected to a feed source, and the first grounding point can be grounded; the first radiation branch is provided with a connection point, the first radiation branch is used for supporting resonance at a first resonant frequency, and the first resonant frequency is a low frequency; the second radiation branch is electrically connected to the connection point, the second radiation branch is used for supporting resonance at a second resonant frequency, and the first resonant frequency is smaller than the second resonant frequency; and vector superposition is performed, in a far field, on an electromagnetic field of the first radiation branch at the first resonant frequency and an electromagnetic field of the second radiation branch at the second resonant frequency, thereby enhancing the electromagnetic field intensity in at least part of the space in the far field. Therefore, the radiation performance of the antenna assembly is improved, and the antenna performance of the antenna assembly is also improved.

Description

Antenna components, middle frame components and electronic equipment

【Technical field】

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

【Background technique】

In the prior art, when two radiators are capacitively coupled to form an antenna assembly, the antenna assembly can support a low frequency band, but the antenna performance of the antenna assembly is insufficient under a limit clearance.

【Content of invention】

In order to solve the above-mentioned technical problems, the technical solution adopted by this application is: an antenna assembly, comprising:

The first radiating branch is provided with a first end and a second end, and a feeding point is provided between the first end and the second end to be electrically connected to a feeding source, and the first radiating branch is at the A first grounding point is set between the first end and the second end for grounding, and a connection point is set between the second end and the first grounding point for the first radiating branch, and the The first radiating stub is used to support resonance at the first resonant frequency;

The second radiation branch is electrically connected to the connection point so as to be electrically connected to the feed source through the feed point, the second radiation branch is used to support resonance at a second resonance frequency, and the first resonance frequency is less than the second resonant frequency, the electromagnetic field of the first radiating branch at the first resonant frequency and the electromagnetic field of the second radiating branch at the second resonant frequency are vectorially superimposed in the far field to enhance the the field strength of the electromagnetic field in at least part of the space; and

a parasitic branch, spaced apart from the second end for capacitive coupling with the first radiation branch, the parasitic branch is grounded, the parasitic branch is used to support resonance at a third resonance frequency, and the second resonance frequency is less than the third resonant frequency.

In order to solve the above technical problems, the adopted technical solution is: a middle frame component, including:

The substrate is provided with a ground plane;

a frame surrounding the substrate; and

The antenna assembly is arranged on the frame so as to be spaced from the ground plane, and the antenna assembly includes:

The first radiating branch is provided with a first end and a second end, and a feeding point is provided between the first end and the second end to be electrically connected to a feeding source, and the first radiating branch is at the A first ground point is set between the first end and the second end to connect to the ground plane, and the first radiation branch is set between the second end and the first ground point having a connection point, the first radiating stub for supporting resonance at a first resonant frequency;

a parasitic stub spaced from the second end for capacitive coupling with the first radiation stub, the parasitic stub is connected to the ground plane, and the parasitic stub is used to support resonance at a third resonance frequency, The second resonant frequency is lower than the third resonant frequency.

In order to solve the above technical problems, the adopted technical solution is: an electronic device, comprising:

Middle frame components, including:

Substrate;

The frame is arranged around the substrate, including a first frame, a second frame, a third frame and a fourth frame connected end to end in sequence, the first frame is set opposite to the third frame, and in the extending direction The lengths are longer than the length of the second frame in the extending direction and longer than the length of the fourth frame in the extending direction, and the second frame is opposite to the fourth frame; and

The antenna assembly is arranged at least on the second frame, and the antenna assembly includes:

a parasitic branch, spaced apart from the second end for capacitive coupling with the first radiation branch, the parasitic branch is grounded, the parasitic branch is used to support resonance at a third resonance frequency, and the second resonance a frequency less than the third resonant frequency;

a display screen connected to the frame and arranged on one side of the substrate; and

The back cover is connected with the frame and arranged on the other side of the substrate.

【Description of drawings】

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic structural diagram of an antenna assembly in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of another embodiment of the antenna assembly in the embodiment shown in FIG. 1;

FIG. 3 is a schematic structural diagram of another embodiment of the antenna assembly in the embodiment shown in FIG. 1;

FIG. 4 is a schematic structural diagram of another embodiment of the antenna assembly in the embodiment shown in FIG. 1;

Fig. 5 is a schematic diagram showing the antenna performance comparison of the antenna assembly in the embodiment shown in Fig. 1 and the embodiment shown in Fig. 4;

Fig. 6 is the radiation pattern diagram of the first radiation branch in one embodiment of the antenna assembly in the embodiment shown in Fig. 4;

Fig. 7 is a radiation pattern diagram of an antenna branch composed of a first radiating branch and a second radiating branch in an embodiment of the antenna assembly in the embodiment shown in Fig. 1;

FIG. 8 is an exploded view of an electronic device in an embodiment of the present application;

Fig. 9 is a front view of the electronic device in the embodiment shown in Fig. 8;

Fig. 10 is a schematic structural diagram of a frame assembly in the embodiment shown in Fig. 8;

FIG. 11 is a structural schematic diagram of the cooperation of the middle frame assembly, the circuit board, and the antenna assembly in the embodiment shown in FIG. 8 .

【Detailed ways】

The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. In particular, the following embodiments are only used to illustrate the present application, but not to 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 of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are independent or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

The present application provides an antenna assembly. The antenna assembly includes: a first radiating branch, which is provided with a first end and a second end, and a feeding point is arranged between the first end and the second end, so as to be electrically connected to a feeding source, and the first The radiating branch is provided with a first grounding point between the first end and the second end for grounding, and the first radiating branch is provided with a connection between the second end and the first grounding point point, the first radiating branch is used to support the resonance at the first resonance frequency; the second radiating branch is electrically connected to the connection point, so as to be electrically connected to the feeding source through the feeding point, and the first Two radiating branches are used to support resonance at a second resonant frequency, the first resonant frequency is lower than the second resonant frequency, the electromagnetic field of the first radiating branch at the first resonant frequency and the second radiating branch The electromagnetic field at the second resonant frequency is vectorially superimposed in the far field to enhance the field strength of the electromagnetic field in at least part of the space in the far field; and a parasitic stub is spaced from the second end to be separated from the first radiation stub Capacitive coupling, the parasitic stub is grounded, the parasitic stub is used to support resonance at a third resonant frequency, and the second resonant frequency is lower than the third resonant frequency.

In some embodiments, the length of the first radiating stub resonating at the first resonance frequency is 5/4 of the wavelength corresponding to the first resonance frequency.

In some embodiments, the first resonant frequency is a low frequency.

In some embodiments, the first resonance frequency is 0.89GHz.

In some embodiments, the length of the second radiating stub resonating at the second resonant frequency is 1/4 of the wavelength corresponding to the second resonant frequency.

In some embodiments, the second resonance frequency is 1.12GHz.

In some embodiments, the third resonance frequency is high frequency and/or ultra high frequency.

In some embodiments, the first ground point is electrically connected to a first tuning control circuit, the first tuning control circuit is grounded, and the first tuning control circuit is used to enable the first radiation stub to support a plurality of third A preset frequency band, the plurality of first preset frequency bands include the first resonant frequency.

In some embodiments, the first tuning control circuit includes a capacitor and/or an inductor.

In some embodiments, the second radiation branch is provided with a second ground point, the second ground point is electrically connected to the second tuning control circuit, the second tuning control circuit is grounded, and the second tuning control circuit It is used to enable the second radiation stub to support multiple second preset frequency bands, where the multiple second preset frequency bands include the second resonant frequency.

The present application provides a middle frame assembly. The middle frame component includes: a base plate provided with a ground plane; a frame surrounding the base plate; and an antenna component arranged on the frame so as to be spaced apart from the ground plane, and the antenna component includes: the first A radiating branch is provided with a first end and a second end, and a feeding point is provided between the first end and the second end to be electrically connected to a feeding source, and the first radiating branch is in the A first ground point is provided between the first end and the second end to connect to the ground plane, and the first radiation branch is provided with a ground point between the second end and the first ground point. a connection point, the first radiating branch is used to support the resonance at the first resonance frequency; the second radiating branch is electrically connected to the connection point, so as to be electrically connected to the feeding source through the feeding point, the The second radiating branch is used to support resonance at a second resonant frequency, the first resonant frequency is lower than the second resonant frequency, and the electromagnetic field of the first radiating branch at the first resonant frequency and the second radiation The electromagnetic field of the stub at the second resonant frequency is superimposed in the far field vector, so as to enhance the electromagnetic field strength in at least part of the space in the far field; stub capacitive coupling, the parasitic stub is connected to the ground plane, the parasitic stub is used to support resonance at a third resonant frequency, the second resonant frequency is lower than the third resonant frequency.

In some embodiments, the first resonance frequency is 0.89GHz.

In some embodiments, the second resonance frequency is 1.12GHz.

In some embodiments, the first ground point is electrically connected to a first tuning control circuit, the first tuning control circuit is connected to the ground plane, and the first tuning control circuit is used to make the first radiation The stub supports multiple first preset frequency bands, and the multiple first preset frequency bands include the first resonant frequency.

In some embodiments, the second radiating branch is provided with a second ground point, the second ground point is electrically connected to a second tuning control circuit, the second tuning control circuit is connected to the ground plane, the The second tuning control circuit is configured to enable the second radiation branch to support a plurality of second preset frequency bands, and the plurality of second preset frequency bands include the second resonant frequency.

The present application provides a middle frame assembly. The middle frame assembly includes: a substrate; a frame surrounding the substrate; and the above-mentioned antenna assembly, the first radiation branch, the second radiation branch and The parasitic branches are arranged on the frame.

The present application provides an electronic device, and the electronic device includes: a display screen; a main casing for installing the display screen; and the above-mentioned antenna assembly, the first radiating branch, the second radiating branch and The parasitic stub is disposed on the main shell.

The present application provides an electronic device. The electronic device includes: a middle frame assembly, including: a substrate; a frame surrounding the substrate, including a first frame, a second frame, a third frame and a Four frames, the first frame is set opposite to the third frame, and the length in the extending direction is longer than the length of the second frame in the extending direction, and longer than the length of the fourth frame in the extending direction, The second frame is disposed opposite to the fourth frame; and an antenna assembly is disposed at least on the second frame, and the antenna assembly includes: a first radiation branch, provided with a first end and a second end, and A feed point is provided between the first end and the second end to be electrically connected to the feed source, and the first radiation branch is provided with a first feed point between the first end and the second end. A grounding point for grounding, the first radiating stub is provided with a connection point between the second end and the first grounding point, and the first radiating stub is used to support resonance at a first resonant frequency; Two radiating branches, electrically connected to the connection point, so as to be electrically connected to the feeding source through the feeding point, the second radiating branch is used to support resonance at a second resonant frequency, and the first resonant frequency Less than the second resonant frequency, the electromagnetic field of the first radiating branch at the first resonant frequency and the electromagnetic field of the second radiating branch at the second resonant frequency are vectorially superimposed in the far field to enhance the far field electromagnetic field strength in at least part of the space; and a parasitic stub spaced from the second end for capacitive coupling with the first radiation stub, the parasitic stub is grounded, and the parasitic stub is used to support the third resonance Resonant frequency, the second resonant frequency is lower than the third resonant frequency; the display screen is connected to the frame and arranged on one side of the substrate; and the rear cover is connected to the frame and arranged on the other side of the substrate.

In some embodiments, the frame is provided with a functional hole, and the antenna assembly is provided with a spanning portion at a position opposite to the functional hole to wrap around the functional hole, and the spanning portion is placed on the substrate The orthographic projection on is located on the substrate.

The present application provides an antenna assembly. The antenna component can be applied in electronic equipment. The antenna assembly may be a low medium high frequency (LMHB) antenna. The antenna assembly improves antenna performance in low frequency bands.

As used herein, an "electronic device" (which may also be referred to as a "terminal" or "mobile terminal" or "electronic device") includes, but is not limited to, configured to ), digital subscriber line (DSL), digital cable, direct cable connection, and/or another data connection/network) and/or via (for example, for cellular networks, wireless local area networks (WLAN), digital A TV network, a satellite network, an AM-FM broadcast transmitter, and/or a device for receiving/transmitting communication signals via a wireless interface of another communication terminal. A communication terminal arranged to communicate over 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, satellite or cellular telephones; Personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data communication capabilities; may include radiotelephones, pagers, Internet/Intranet access , a PDA with a web browser, organizer, calendar, and/or Global Positioning System (GPS) receiver; and a conventional laptop and/or palm-type receiver or other electronic device including a radiotelephone transceiver. A mobile phone is an electronic device equipped with a cellular communication module.

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of an antenna assembly 100 according to an embodiment of the present application. The antenna assembly 100 can be one or more of a Flexible Printed Circuit (FPC) antenna, a Laser Direct Structuring (LDS) antenna, a Print Direct Structuring (PDS) antenna, and a metal stud antenna. a mixture of species. Of course, the antenna assembly 100 may also be other types of antennas, which will not be repeated here. In some embodiments, the antenna assembly 100 may be one or a mixture of strips, sheets, rods, coatings, films, etc., but not limited to the forms listed here.

The antenna assembly 100 may include a first radiating stub 10 for supporting a first resonant frequency, a second radiating stub 20 connected to the first radiating stub 10 for supporting a second resonant frequency, and capacitively coupled with the first radiating stub 10 of parasitic branches 30 . Wherein, the first radiating branch 10 is provided with a feeding point 13 to be electrically connected with a feeding source 14 . The second radiating stub 20 is connected to the feeding point 13 of the first radiating stub 10 . The parasitic stub 30 is spaced apart from the first radiating stub 10 to form a gap between the parasitic stub 30 and the first radiating stub 10 , and the first radiating stub 10 is capacitively coupled to the parasitic stub 30 through the gap. "Capacitive coupling" means that an electric field is generated between the first radiating branch 10 and the parasitic branch 30, the signal of the first radiating branch 10 can be transmitted to the parasitic branch 30 through the electric field, and the signal of the parasitic branch 30 can be transmitted to the first radiating branch 30 through the electric field. The stub 10, so that the first radiating stub 10 and the parasitic stub 30 can realize electrical signal conduction even when they are disconnected.

The first radiating branch 10 can at least support a low band (LB for short), for example, the first radiating branch 10 can support a low and mid-band (LMB). The second radiation stub 20 may at least support a mid-band (MB), for example, the second radiation stub 20 may support a low mid-band. The parasitic branch 30 can support high band (High band, HB for short) and ultra high band (UHB).

Wherein, the first radiating branch 10 can support the resonance of the first resonant frequency in the low frequency band, the second radiating branch 20 can support the resonance of the second resonant frequency, and the parasitic branch 30 can support the resonance of the third resonant frequency. The first resonant frequency is lower than the second resonant frequency, and both the first resonant frequency and the second resonant frequency are lower than the third resonant frequency. The electromagnetic field of the first radiating branch 10 at the first resonant frequency and the electromagnetic field of the second radiating branch 20 at the second resonant frequency are superimposed in the far field vector to enhance the electromagnetic field strength in at least part of the space in the far field, which can improve the antenna assembly 100 For example, the radiation performance of the first radiation branch 10 in the low frequency band can further improve the antenna performance of the antenna assembly 100 in the low frequency band, so that the antenna assembly 100 can enhance the communication performance of the electronic device in a very small clearance.

The terms "first", "second", "third" and the like in the present application are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first", "second", "third", etc. may expressly or implicitly include at least one of that feature.

It can be understood that, in one embodiment, the electromagnetic field of the first radiating branch 10 at the first resonant frequency and the electromagnetic field of the second radiating branch 20 at the second resonant frequency are vectorially superimposed in the far field, so as to enhance the far field partial space. Electromagnetic field strength. In one embodiment, the electromagnetic field of the first radiating branch 10 at the first resonant frequency and the electromagnetic field of the second radiating branch 20 at the second resonant frequency are vectorially superimposed in the far field to enhance the electromagnetic field strength in the far field.

The names "first radiating branch", "second radiating branch" and "radiating branch" in the above embodiment can be converted to each other, for example, "first radiating branch" can be converted into "second radiating branch", and correspondingly, "Second radial stub" can be converted to "first radial stub".

The names "first resonant frequency", "second resonant frequency", "third resonant frequency" and "resonant frequency" in the above embodiments can be converted to each other, for example, "first resonant frequency" can be converted to "second resonant frequency" frequency", and correspondingly, the "second resonant frequency" can be converted into the "first resonant frequency".

The first radiation stub 10 can support a first preset frequency band including a first resonance frequency. The first radiating stub 10 is provided with a first end 11 and a second end 12 . The first radiating stub 10 is spaced apart from the parasitic stub 30 at the second end 12 for capacitive coupling with the parasitic stub 30 . In one embodiment, the first end 11 is an end of the first radiating stub 10 away from the parasitic stub 30 .

The first radiating branch 10 can be provided with a feeding point 13 between the first end 11 and the second end 12 to be electrically connected to the feeding source 14 .

The first radiating branch 10 is provided with a first grounding point 15 between the first end 11 and the feeding point 13 , the first grounding point 15 is electrically connected to the first tuning control circuit 16 , and the first tuning control circuit 16 is grounded. In an embodiment, the first tuning control circuit 16 can be omitted, and the first ground point 15 is directly grounded.

In some embodiments, the first tuning control circuit 16 is mainly to meet the requirement of supporting multiple first preset frequency bands, therefore, the first tuning control circuit 16 may include a switch control circuit and/or a load circuit, or include a capacitor ( eg fixed capacitors and/or adjustable capacitors) and/or inductances (eg fixed inductors and/or adjustable inductors).

In an embodiment, the switch control circuit may be a switch chip with a switch function, or may be a single-pole-multi-throw switch or a single-pole-single-throw switch.

The first radiating stub 10 is provided with a connection point 17 between the feeding point 13 and the first grounding point 15 to be electrically connected to the second radiating stub 20 .

In one embodiment, the resonant length of the first radiation branch 10 at the first resonant frequency is 5/4 of the wavelength corresponding to the first resonant frequency.

The second radiation stub 20 can support a second preset frequency band including the second resonance frequency. The second radiating stub 20 is provided with a third end 21 and a fourth end 22 . The second radiating stub 20 can be electrically connected to the connection point 17 of the first radiating stub 10 at the third end 21 . In one embodiment, the fourth end 22 is an end of the second radiating stub 20 away from the parasitic stub 30 .

It can be understood that, in some embodiments, the first radiating stub 10 may be a part of the second radiating stub 20 from the second end 12 to the connecting point 17, and the first radiating stub 10 is from the first end 11 to the connecting point. 17 is electrically connected to the second radiation branch 20 .

In some embodiments, the length of the second radiating stub 20 resonating at the second resonance frequency is 1/4 of the wavelength corresponding to the second resonance frequency.

The parasitic stub 30 can support a third predetermined frequency band including the third resonant frequency. The parasitic branch 30 can be provided with a fifth end 31 and a sixth end 32 . The parasitic stub 30 can be spaced apart from the second end 12 of the first radiating stub 10 at the fifth end 31 to capacitively couple with the first radiating stub 10 . In one embodiment, the sixth end 32 is an end of the parasitic stub 30 away from the first radiating stub 10 .

It can be understood that the names "first preset frequency band", "second preset frequency band", "third preset frequency band" and "preset frequency band" in the above embodiments can be interchanged, for example, "first preset Frequency band" can be converted into "second preset frequency band", and correspondingly, "second preset frequency band" can be converted into "first preset frequency band".

In addition, the names "first end", "second end", "third end", "fourth end", "fifth end", "sixth end" and "end" in the above embodiments can be converted to each other , for example, "first end" can be converted to "second end", and correspondingly, "second end" can be converted to "first end".

The parasitic stub 30 is provided with a second grounding point 33 between the fifth end 31 and the sixth end 32 for grounding.

In an embodiment, please refer to FIG. 2 . FIG. 2 is a schematic structural diagram of another embodiment of the antenna assembly 100 in the embodiment shown in FIG. 1 . Wherein, the first radiating stub 10 can be bent according to the requirements of the space or the electronic equipment on which the first radiating stub 10 is installed. Certainly, the second radiating branch 20 and/or the parasitic branch 30 may also be bent, and details are not repeated here.

In an embodiment, please refer to FIG. 3 , which is a schematic structural diagram of another embodiment of the antenna assembly 100 in the embodiment shown in FIG. 1 . Wherein, the second radiation branch 20 is provided with a third ground point 23 between the third end 21 and the fourth end 22 , and the third ground point 23 is electrically connected to the second tuning control circuit 24 . In some embodiments, the second tuning control circuit 24 may be omitted, and the third ground point 23 is directly grounded.

It can be understood that the names "first grounding point", "second grounding point", "third grounding point" and "grounding point" in the above embodiments can be converted to each other, for example, "first grounding point" can be converted to "Second grounding point", and correspondingly, "second grounding point" can be converted into "first grounding point".

In one embodiment, the second tuning control circuit 24 is mainly to meet the requirement of supporting multiple second preset frequency bands. Therefore, the second tuning control circuit 24 may include a switch control circuit and/or a load circuit, or include a capacitor ( eg fixed capacitors and/or adjustable capacitors) and/or inductances (eg fixed inductors and/or adjustable inductors).

It can be understood that the names "first tuning control circuit", "second tuning control circuit" and "tuning control circuit" in the above embodiments can be interchanged, for example, "first tuning control circuit" can be converted into "second tuning control circuit" Tuning control circuit", and correspondingly, "second tuning control circuit" can be converted into "first tuning control circuit".

Please refer to FIG. 4 . FIG. 4 is a schematic structural diagram of another embodiment of the antenna assembly 100 in the embodiment shown in FIG. 1 . Wherein, the antenna assembly 100 in the embodiment shown in FIG. 4 omits the second radiation stub 20 .

Corresponding performance tests are performed on the antenna assembly 100 in the embodiment shown in FIG. 1 and the antenna assembly 100 in the embodiment shown in FIG. 4 by using simulation software. The antenna performance of the antenna assembly 100 in some embodiments can be referred to FIG. 5 . FIG. 5 is a schematic diagram of comparing the antenna performance of the antenna assembly 100 in the embodiment shown in FIG. 1 and the embodiment shown in FIG. 4 . Wherein, the antenna performance of the antenna stub composed of the first radiating stub 10 and the second radiating stub 20 in the antenna assembly 100 in the embodiment shown in FIG. 1 can refer to the curves shown in A such as A1, A2 and A3 in FIG. The antenna performance of the first radiating stub 10 in the antenna assembly 100 in the illustrated embodiment can refer to the curves shown in B such as B1, B2 and B3 in FIG. 5 .

A1 is the return loss curve of the antenna stub composed of the first radiating stub 10 and the second radiating stub 20 in the antenna assembly 100 . B1 is a return loss curve of the first radiating stub 10 in the antenna assembly 100 . A2 is the radiation efficiency (System Radiation Efficiency) curve of the antenna stub composed of the first radiation stub 10 and the second radiation stub 20 in the antenna assembly 100 . B2 is the radiation efficiency curve of the first radiation stub 10 in the antenna assembly 100 . A3 is the total efficiency (System Total Efficiency, total efficiency=radiation efficiency−return loss) curve of the antenna stub composed of the first radiation stub 10 and the second radiation stub 20 in the antenna assembly 100. B3 is the total efficiency (total efficiency=radiation efficiency−return loss) curve of the first radiation stub 10 in the antenna assembly 100 .

Wherein, the return loss corresponding to the first resonant frequency 0.89324 GHz in the low frequency band of the curve A1 is -5.2913146 dB. The return loss of the curve B1 corresponding to the first resonance frequency 0.89324 GHz in the low frequency band is −5.9043064 dB. It can be seen that the antenna stub composed of the first radiating stub 10 and the second radiating stub 20 in the antenna assembly 100 in the embodiment shown in FIG. 1 can improve the performance of the antenna by approximately 0.61 dB.

The radiation efficiency of curve A2 corresponding to the first resonance frequency 0.89324 GHz in the low frequency band is −3.3192888 dB. The radiation efficiency of the curve B2 corresponding to the first resonance frequency 0.89324 GHz in the low frequency band is −3.7398522 dB. It can be seen that the radiation efficiency of the antenna stub composed of the first radiating stub 10 and the second radiating stub 20 in the antenna assembly 100 in the embodiment shown in FIG. 1 is improved by approximately 0.42 dB.

The total efficiency corresponding to the first resonance frequency 0.89324GHz in the low frequency band of the curve A3 is -4.9141174dB. The total efficiency corresponding to the first resonance frequency 0.89324GHz in the low frequency band of the curve B3 is -5.1983856dB. It can be seen that, in the embodiment shown in FIG. 1 , the total efficiency of the antenna stub composed of the first radiating stub 10 and the second radiating stub 20 in the antenna assembly 100 can be increased by approximately 0.28 dB.

It can be seen that when the resonant direction of the first radiating stub 10 at the first resonant frequency is the same as the resonant direction of the second radiating stub 20 at the second resonant frequency, the radiation performance of the antenna assembly 100 such as the first radiating stub 10 in the low frequency band is improved, and further The antenna performance of the antenna assembly 100 in the low frequency band can be improved, so that the antenna assembly 100 can enhance the communication performance of the electronic device in the case of a very small headroom.

In one embodiment, the first resonance frequency is 0.89 GHz.

In one embodiment, the second resonance frequency is 1.12GHz.

In an embodiment, the resonant length of the first radiating branch 10 is 5/4 of the wavelength corresponding to the first resonant frequency.

In an embodiment, the resonant length of the second radiating branch 20 is 1/4 of the wavelength corresponding to the second resonant frequency.

Please refer to FIG. 6 and FIG. 7 together. FIG. 6 is a radiation pattern diagram of the first radiation branch 10 of the antenna assembly 100 in the embodiment shown in FIG. 4 , and FIG. 7 is the antenna assembly 100 in the embodiment shown in FIG. 1 In one embodiment, the radiation pattern of the antenna stub composed of the first radiating stub 10 and the second radiating stub 20 . Wherein, the first direction X' is perpendicular to the second direction Z'. The resonant frequencies in Figure 6 and Figure 7 are the same, the radiation efficiency in Figure 6 is smaller than that in Figure 7, the total efficiency in Figure 6 is smaller than that in Figure 7, and the radiation pattern shown in Figure 6 is obviously The current in the first direction X' is generated, and the radiation pattern shown in Figure 7 is obviously the current in the second direction Z', and Figure 7 is more able to stimulate the current in the second direction Z' than Figure 6, improving the Performance of the antenna assembly 100.

Next, an electronic device is described, and the electronic device can be installed with the antenna assembly 100 in the above-mentioned embodiment. The electronic device may be any of a number of electronic devices including, but not limited to, cellular phones, smart phones, other wireless communication devices, personal digital assistants, audio players, other media players, music recorders, Video recorders, cameras, other media recorders, radios, medical equipment, calculators, programmable remote controls, pagers, netbook computers, personal digital assistants (PDAs), portable multimedia players (PMPs), Moving Picture Experts Group (MPEG-1 or MPEG-2), audio layer 3 (MP3) players, portable medical equipment, and digital cameras and combinations thereof.

In some embodiments, electronic equipment may include, but not limited to, mobile phones, Internet devices (mobile internet device, MID), e-books, portable playback stations (Play Station Portable, PSP) or personal digital assistants (Personal Digital Assistant, PDA), etc. Electronic equipment with communication functions.

Please refer to FIG. 8 and FIG. 9 , FIG. 8 is an exploded view of an electronic device in an embodiment of the present application, and FIG. 9 is a front view of the electronic device in the embodiment shown in FIG. 8 . The electronic device 200 may include a display screen 40 for displaying information, a middle frame assembly 50 for installing the display screen 40 on one side, a circuit board 60 installed on the middle frame assembly 50, and a battery installed on the middle frame assembly 50 70 and the rear cover 80 snap-fitted on the other side of the middle frame assembly 50 .

Wherein, the display screen 40 may be a liquid crystal display (Liquid Crystal Display, LCD) or an organic light-emitting diode display (Organic Light-Emitting Diode, OLED) and other types of display screens for displaying information and pictures.

The material of the middle frame assembly 50 may be metals such as magnesium alloy, aluminum alloy, stainless steel, etc. Of course, the material is not limited thereto, and may also be other materials such as insulating materials, such as hard materials. The middle frame assembly 50 can be placed between the display screen 40 and the rear cover 80 . The middle frame assembly 50 can be used to carry the display screen 40 . The middle frame assembly 50 is fastened with the rear cover 80 to form an outer contour of the electronic device 200 and an accommodating cavity is formed inside. The accommodating cavity can be used for accommodating electronic components such as a camera, a circuit board 60 , a battery 70 , a processor, an antenna assembly 100 and various types of sensors in the electronic device 200 . It can be understood that the housing assembly is not limited to the middle frame assembly 50 and the rear cover 80 , and may also include other structures, which will not be repeated here.

The circuit board 60 is installed in the accommodation cavity, and can be installed in any position in the accommodation cavity. The circuit mainboard 60 may be the mainboard of the electronic device 200 . The processor of the electronic device 200 may be arranged on the circuit board 60 . One, two or more of functional components such as a motor, a microphone, a loudspeaker, a receiver, an earphone jack, a universal serial bus interface (USB interface), a camera, a distance sensor, an ambient light sensor, and a gyroscope can also be integrated on the circuit main board 60. Multiple. Meanwhile, the display screen 40 can be electrically connected to the circuit board 60 .

The battery 70 is installed in the accommodating cavity, and can be installed in any position in the accommodating cavity. The battery 70 can be electrically connected to the circuit board 60 , so that the battery 70 can provide power for the electronic device 200 . A power management circuit may be provided on the circuit board 60 . The power management circuit is used to distribute the voltage provided by the battery 70 to various electronic components in the electronic device 200 such as the display screen 40 .

The rear cover 80 can be made of the same material as that of the middle frame assembly 50, and of course other materials can also be used. The rear cover 80 can be integrally formed with the middle frame assembly 50 . In some embodiments, the rear cover 80 can wrap the middle frame assembly 50 and can carry the display screen 40 . Structures such as a hole for a rear camera and a hole for installing a fingerprint identification module can be formed on the rear cover 80 .

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. 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.

Please refer to FIG. 10 . FIG. 10 is a schematic structural diagram of the frame assembly 50 in the embodiment shown in FIG. 8 . The middle frame assembly 50 may include a substrate 51 for carrying the display screen 40 and a frame 52 surrounding the substrate 51 . Wherein, the substrate 51 is disposed opposite to the rear cover 80 . The frame 52 can be used for fastening connection with the rear cover 80 . That is, the base plate 51 , the frame 52 and the rear cover 80 surround and form an accommodating cavity.

The substrate 51 can be a conductive metal, and of course other materials can also be used. A ground plane and a feed source can be arranged on the substrate 51. In some embodiments, the ground plane and the feed source may not be disposed on the substrate 51 , but directly disposed on the circuit board 60 . In some embodiments, the substrate 51 may be omitted.

The frame 52 can be a conductive metal, so the frame 52 can also be called a "metal frame". Of course, the frame 52 can also be made of other materials, such as insulating materials. The frame 52 can also be made of the same material as the substrate 51 . The frame 52 may include a first frame 521 , a second frame 522 , a third frame 523 and a fourth frame 524 connected end to end in sequence. The first frame 521 , the second frame 522 , the third frame 523 and the fourth frame 524 surround the substrate 51 and can be connected and fixed with the substrate 51 . In some embodiments, the frame 52 can be integrated with the rear cover 80 . For example, the frame 52 is extended from the edge of the rear cover 80 to one side of the display screen 40 to be buckled connected with the display screen 40 .

It can be understood that the names "first frame", "second frame", "third frame", "fourth frame" and "frame" in the above embodiments can be converted to each other, for example, "first frame" can be converted is the "second border", and correspondingly, the "second border" can be converted into the "first border".

In some embodiments, the first frame 521 , the second frame 522 , the third frame 523 and the fourth frame 524 surround and form a rounded rectangle. Of course, other shapes such as circle, triangle, etc. are also possible. In some embodiments, the first frame 521 is set opposite to the third frame 523 , and the second frame 522 is set opposite to the fourth frame 524 .

Understandably, the middle frame assembly 50 and the rear cover 80 can form a main casing. In some embodiments, the main housing may not only be limited to the middle frame assembly 50 and the rear cover 80 , but may also include others, which will not be repeated here.

Please refer to FIG. 11 . FIG. 11 is a schematic diagram of the cooperation of the middle frame assembly 50 , the circuit board 60 and the antenna assembly 100 in the embodiment shown in FIG. 8 . The antenna assembly 100 can be mounted on the middle frame assembly 50 . In some embodiments, the antenna assembly 100 may serve as a part of the middle frame assembly 50 . Of course, in some embodiments, the antenna assembly 100 can also be installed on other positions of the main casing such as the rear cover. In some embodiments, the antenna assembly 100 can be machined from the main housing. For example, antenna assembly 100 appears as a slot antenna. In some embodiments, the antenna assembly 100 can be fixed directly on the main housing.

Please refer to FIG. 10 and FIG. 11 together, the first radiating stub 10 is disposed on the frame 52 such as the second frame 522 , and the second radiating stub 20 is disposed on the third frame 523 . The parasitic branch 30 is disposed on the frame 52 such as the first frame 521 and the second frame 522 . Of course, the first radiating branch 10 , the second radiating branch 20 and the parasitic branch 30 can also be arranged on other frames in the frame 52 as required, so details are not repeated here.

The first radiating branch 10 can be disposed on the frame 52 such as the second frame 522 . In some embodiments, the first radiating branch 10 may extend toward the side of the frame 52 such as the third frame 523 , and may extend on the frame 52 such as the third frame 523 .

In some embodiments, the first end 11 may be located at a position where the first radiating branch 10 is opposite to the frame 52 such as the third frame 523 . In some embodiments, the first end 11 may be located at a position where the first radiating branch 10 is opposite to the frame 52 such as the second frame 522 .

In an embodiment, the second end 12 may be located at a position where the first radiating branch 10 is opposite to the frame 52 such as the second frame 522 .

In one embodiment, the feed point 13 can be electrically connected to the feed source on the substrate 51 or the circuit board 60 . In an embodiment, the feeding point 13 may be located at a position where the first radiating branch 10 is opposite to the frame 52 such as the second frame 522 . In one embodiment, the feeding point 13 may be located at a position where the first radiating branch 10 is opposite to the frame 52 such as the third frame 523 .

In one embodiment, the first ground point 15 can be electrically connected to the ground plane on the substrate 51 or the circuit board 60 . In some embodiments, the first ground point 15 may be located at a position where the first radiating branch 10 is opposite to the frame 52 such as the third frame 523 . In some embodiments, the first ground point 15 may be located at a position where the first radiating branch 10 is opposite to the frame 52 such as the second frame 522 .

In an embodiment, in order to fix the first radiating branch 10 . The first radiating branch 10 is provided with a fixing part 18 extending to the substrate 51 or the circuit main board 60, and the fixing part 18 and the substrate 51 or the circuit main board 60 are fixed with screws, bolts, glue, etc. to avoid the first radiating branch 10 Loose and fall off.

In an embodiment, the second radiating branch 20 may be disposed on the frame 52 such as the second frame 522 . In some embodiments, the second radiating branch 20 may extend toward the side of the frame 52 such as the third frame 523 , and may extend on the frame 52 such as the third frame 523 .

In an embodiment, the third end 21 may be located at a position where the second radiating branch 20 is opposite to the frame 52 such as the second frame 522 . In some embodiments, the third end 21 may be located at a position where the second radiating branch 20 is opposite to the frame 52 such as the third frame 523 .

In an embodiment, the fourth end 22 may be located at a position where the second radiating branch 20 is opposite to the frame 52 such as the second frame 522 . In some embodiments, the fourth end 22 may be located at a position where the second radiating branch 20 is opposite to the frame 52 such as the third frame 523 .

In an embodiment, in order to fix the second radiation branch 20 . The second radiating branch 20 is provided with a fixing part 25 extending to the substrate 51 or the circuit main board 60, and the fixing part 25 and the substrate 51 or the circuit main board 60 are fixed with structures such as screws, bolts, glue, etc., so as to avoid the second radiating branch 20 Loose and fall off.

In one embodiment, when the antenna assembly 100 in the embodiment shown in FIG. ground plane electrical connection. In some embodiments, the third ground point 23 may be located at a position where the second radiating branch 20 is opposite to the frame 52 such as the third frame 523 . In some embodiments, the third ground point 23 may be located at a position where the second radiating branch 20 is opposite to the frame 52 such as the second frame 522 .

In one embodiment, the parasitic branch 30 can be arranged on the frame 52 such as the second frame 522. In some embodiments, the parasitic branch 30 can be extended to the frame 52 such as the first frame 521, and can be placed on the frame 52 such as The first frame 521 is extended.

In some embodiments, the fifth end 31 may be located at a position where the parasitic branch 30 is opposite to the frame 52 such as the first frame 521 . In some embodiments, the fifth end 31 may be located at a position where the parasitic branch 30 is opposite to the frame 52 such as the second frame 522 .

In an embodiment, the sixth end 32 may be located at a position where the parasitic branch 30 is opposite to the frame 52 such as the second frame 522 .

In one embodiment, the second ground point 33 can be electrically connected to the ground plane on the substrate 51 or the circuit board 60 . In some embodiments, the second ground point 33 may be located at a position where the parasitic stub 30 is opposite to the frame 52 such as the second frame 522 . In some embodiments, the second ground point 33 may be located at a position where the parasitic stub 30 is opposite to the frame 52 such as the first frame 521 .

In one embodiment, in order to make way for the functional holes opened on the frame 52 such as microphone holes, speaker holes, earphone jack installation holes, universal serial bus interface (USB interface) installation holes, etc., the antenna assembly 100 such as the first radiation branch 10. The second radiating branch 20 and the parasitic branch 30 can be arranged on one side of the functional hole, that is, bypass the side of the functional hole, and form a spanning portion at the bypassed position. In some embodiments, the orthographic projection of the spanning portion on the substrate 51 may be located on the substrate 51 , or the orthographic projection of the spanning portion on the circuit main board 60 may be located on the circuit main board 60 .

It can be understood that all or part of the functional holes on the frame 52 can also be located on the part of the frame 52 such as the second frame 522 or the third frame 523 opposite to the first radiation branch 10, and all or part of the functional holes on the frame 52 can be It is located on the part of the frame 52 such as the second frame 522 or the third frame 523 opposite to the second radiating branch 20 . Correspondingly, the first radiating stub 10 and/or the second radiating stub 20 may also be provided with a spanning portion. Specifically, the function and structure of the spanning portion in the first radiating stub 10 and/or the second radiating stub 20 may be substantially the same as the spanning portion in the parasitic stub 30 . For the function and structure of the spanning portion in the first radiating stub 10 and/or the second radiating stub 20 , please refer to the spanning portion in the parasitic stub 30 .

In some embodiments, the sixth end 32 of the parasitic stub 30 may be located on the span. In an embodiment, the second end 12 of the first radiating branch 10 may also be located on the spanning portion. Correspondingly, structures such as grounding points, feeding points, and ends in the antenna assembly 100 may also be located on the spanning portion.

Figure 7 and Figure 11 can be referred to together. Wherein, the first direction X' may be consistent with the extending direction of the frame 52 such as the second frame 522, and the second direction Z' may be consistent with the extending direction of the frame 52 such as the first frame 521. In the electronic device 200, the current in the second direction Z' can improve the antenna performance of the antenna assembly 100 in the electronic device 200.

The above is only an embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process conversion made by using the specification and drawings of the application, or directly or indirectly used in other related technologies fields, are all included in the scope of patent protection of this application in the same way.

Claims

An antenna assembly comprising:

The first radiating branch is provided with a first end and a second end, and a feeding point is provided between the first end and the second end to be electrically connected to a feeding source, and the first radiating branch is at the A first grounding point is set between the first end and the second end for grounding, and a connection point is set between the second end and the first grounding point for the first radiating branch, and the The first radiating stub is used to support resonance at the first resonant frequency;

The second radiation branch is electrically connected to the connection point so as to be electrically connected to the feed source through the feed point, the second radiation branch is used to support resonance at a second resonance frequency, and the first resonance frequency is less than the second resonant frequency, the electromagnetic field of the first radiating branch at the first resonant frequency and the electromagnetic field of the second radiating branch at the second resonant frequency are vectorially superimposed in the far field to enhance the the field strength of the electromagnetic field in at least part of the space; and

a parasitic branch, spaced apart from the second end for capacitive coupling with the first radiation branch, the parasitic branch is grounded, the parasitic branch is used to support resonance at a third resonance frequency, and the second resonance frequency is less than the third resonant frequency.
The antenna assembly according to claim 1, wherein the length of the first radiating stub resonating at the first resonant frequency is 5/4 of the wavelength corresponding to the first resonant frequency.
The antenna assembly according to claim 1 or 2, wherein the first resonant frequency is a low frequency.
The antenna assembly of claim 3, wherein the first resonant frequency is 0.89 GHz.
The antenna assembly according to claim 1 or 2, wherein the length of the second radiating stub resonating at the second resonant frequency is 1/4 of the wavelength corresponding to the second resonant frequency.
The antenna assembly according to claim 5, wherein the second resonant frequency is 1.12 GHz.
The antenna assembly according to claim 1 or 2, wherein the third resonance frequency is high frequency and/or ultra high frequency.
The antenna assembly according to claim 1, wherein the first ground point is electrically connected to a first tuning control circuit, the first tuning control circuit is grounded, and the first tuning control circuit is used to make the first The radiation stub supports multiple first preset frequency bands, and the multiple first preset frequency bands include the first resonance frequency.
The antenna assembly of claim 8, wherein the first tuning control circuit comprises a capacitor and/or an inductor.
The antenna assembly according to any one of claims 1-2, 4, 6, 8-9, wherein the second radiating branch is provided with a second ground point, and the second ground point is connected to the second tuning control circuit Electrically connected, the second tuning control circuit is grounded, and the second tuning control circuit is used to enable the second radiation branch to support multiple second preset frequency bands, and the multiple second preset frequency bands include the first Second resonant frequency.
A middle frame assembly comprising:

The substrate is provided with a ground plane;

a frame surrounding the substrate; and

The antenna assembly is arranged on the frame so as to be spaced from the ground plane, and the antenna assembly includes:

The first radiating branch is provided with a first end and a second end, and a feeding point is provided between the first end and the second end to be electrically connected to a feeding source, and the first radiating branch is at the A first ground point is set between the first end and the second end to connect to the ground plane, and the first radiation branch is set between the second end and the first ground point having a connection point, the first radiating stub for supporting resonance at a first resonant frequency;

The second radiation branch is electrically connected to the connection point so as to be electrically connected to the feed source through the feed point, the second radiation branch is used to support resonance at a second resonance frequency, and the first resonance frequency is less than the second resonant frequency, the electromagnetic field of the first radiating branch at the first resonant frequency and the electromagnetic field of the second radiating branch at the second resonant frequency are vectorially superimposed in the far field to enhance the the field strength of the electromagnetic field in at least part of the space; and

a parasitic stub spaced from the second end for capacitive coupling with the first radiation stub, the parasitic stub is connected to the ground plane, and the parasitic stub is used to support resonance at a third resonance frequency, The second resonant frequency is lower than the third resonant frequency.
The middle frame assembly according to claim 11, wherein the length of the first radiation branch resonating at the first resonance frequency is 5/4 of the wavelength corresponding to the first resonance frequency.
The middle frame assembly according to claim 11 or 12, wherein the first resonance frequency is 0.89 GHz.
The middle frame assembly according to claim 11 or 12, wherein the length of the second radiating branch resonating at the second resonant frequency is 1/4 of the wavelength corresponding to the second resonant frequency.
The middle frame assembly according to claim 14, wherein the second resonance frequency is 1.12 GHz.
The middle frame assembly according to claim 11 or 12, wherein the third resonance frequency is high frequency and/or ultra high frequency.
The middle frame assembly according to claim 11, wherein the first ground point is electrically connected to a first tuning control circuit, the first tuning control circuit is connected to the ground plane, and the first tuning control circuit is connected to the ground plane. In order for the first radiation branch to support a plurality of first predetermined frequency bands, the plurality of first predetermined frequency bands include the first resonant frequency.
The middle frame assembly according to any one of claims 11-12, 15, 17, wherein the second radiating branch is provided with a second ground point, and the second ground point is electrically connected to the second tuning control circuit, The second tuning control circuit is connected to the ground plane, and the second tuning control circuit is used to enable the second radiation branch to support a plurality of second preset frequency bands, and the plurality of second preset frequency bands include the the second resonant frequency.
An electronic device comprising:

Middle frame components, including:

Substrate;

The frame is arranged around the substrate, including a first frame, a second frame, a third frame and a fourth frame connected end to end in sequence, the first frame is set opposite to the third frame, and in the extending direction The lengths are longer than the length of the second frame in the extending direction and longer than the length of the fourth frame in the extending direction, and the second frame is opposite to the fourth frame; and

The antenna assembly is arranged at least on the second frame, and the antenna assembly includes:

The first radiating branch is provided with a first end and a second end, and a feeding point is provided between the first end and the second end to be electrically connected to a feeding source, and the first radiating branch is at the A first grounding point is set between the first end and the second end for grounding, and a connection point is set between the second end and the first grounding point for the first radiating branch, and the The first radiating stub is used to support resonance at the first resonant frequency;

The second radiation branch is electrically connected to the connection point so as to be electrically connected to the feed source through the feed point, the second radiation branch is used to support resonance at a second resonance frequency, and the first resonance frequency is less than the second resonant frequency, the electromagnetic field of the first radiating branch at the first resonant frequency and the electromagnetic field of the second radiating branch at the second resonant frequency are vectorially superimposed in the far field to enhance the the field strength of the electromagnetic field in at least part of the space; and

a parasitic branch, spaced apart from the second end for capacitive coupling with the first radiation branch, the parasitic branch is grounded, the parasitic branch is used to support resonance at a third resonance frequency, and the second resonance a frequency less than the third resonant frequency;

a display screen connected to the frame and arranged on one side of the substrate; and

The back cover is connected with the frame and arranged on the other side of the substrate.
The electronic device according to claim 19, wherein a functional hole is provided on the frame, and a spanning portion is provided at a position opposite to the functional hole in the antenna assembly so as to wrap around the functional hole, the The orthographic projection of the spanning portion on the substrate is located on the substrate.