CN117791093A

CN117791093A - Antenna assembly and electronic equipment

Info

Publication number: CN117791093A
Application number: CN202211152115.3A
Authority: CN
Inventors: 林栢暐; 李晨光
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2024-03-29
Also published as: WO2024060819A1

Abstract

The application provides an antenna assembly and have this antenna assembly's electronic equipment, antenna assembly includes: the first radiation branch, the second radiation branch and the first feed source. The first radiation branch comprises a first grounding end, a first feed point and a first opening end which are sequentially arranged. The second radiation branch comprises a second opening end and a second grounding end, and a gap is formed between the first opening end and the second opening end. The first feed source is electrically connected to the first feed point and used for exciting the first radiation branch to generate a first resonance mode. The length from the first feed point to the first opening end is less than or equal to 20% of the length of the first radiation branch, and the first feed source excites at least one coupling resonance mode on the second radiation branch. The antenna assembly provided by the application can meet independent tuning of multiple frequency bands in a limited space.

Description

Antenna assembly and electronic equipment

Technical Field

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

Background

With the development of network technology, the demand for high transmission rate for transmitting data is increasing. The multi-band coverage technology can improve throughput by covering a plurality of frequency bands simultaneously, so as to improve the transmission data quantity and the data transmission rate. For the antenna design on the electronic device, in the multi-band coverage, tuning of some frequency bands can cause large offset of other frequency bands, so that independent tuning of the multi-frequency bands cannot be satisfied, and the support rate of multi-frequency band combination is low. Therefore, how to flexibly design the antenna covered by a plurality of frequency bands in a limited space, and meet the independent tuning of the plurality of frequency bands, improve the supporting rate of the combination of the plurality of frequency bands, and become the technical problem to be solved.

Disclosure of Invention

The application provides an antenna assembly capable of satisfying independent tuning of multiple frequency bands in a limited space and an electronic device with the antenna assembly.

In one aspect, the present application provides an antenna assembly comprising:

the first radiation branch comprises a first grounding end, a first feed point and a first opening end which are sequentially arranged;

the second radiation branch comprises a second opening end and a second grounding end, and a gap is formed between the first opening end and the second opening end; and

the first feed source is electrically connected with the first feed point and is used for exciting the first radiation branch to generate a first resonance mode;

the length from the first feed point to the first opening end is smaller than or equal to 20% of the length of the first radiation branch, and the first feed source excites at least one coupling resonance mode on the second radiation branch.

According to the antenna assembly, the first radiation branch and the second radiation branch are coupled through the coupling gap, the length from the first feed point to the first opening end is designed on the first radiation branch to be smaller than or equal to 20% of the length of the first radiation branch, the position of the first feed point is close to the second radiation branch, the first feed source is facilitated to excite at least one coupling resonance mode on the second radiation branch, and the coupling resonance mode and the first resonance mode are generated in different radiation branches respectively, so that when the first resonance mode is tuned, the coupling resonance mode cannot be influenced by the first resonance mode and greatly deviate, namely, the coupling resonance mode and the first resonance mode can be tuned mutually independently, so that the independent tuning of multiple frequency bands is met in a limited space, the support rate of the multiple frequency band combination is improved, and the transmission rate is further improved.

On the other hand, the application also provides electronic equipment, which comprises the antenna assembly.

Drawings

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

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

FIG. 2 is a schematic diagram of a resonant mode generated by the antenna assembly provided in FIG. 1;

FIG. 3a is a current distribution diagram of the first resonant mode shown in FIG. 2;

fig. 3b is a schematic structural diagram of a second antenna assembly according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a third antenna assembly according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a resonant mode generated by the antenna assembly provided in FIG. 4;

FIG. 6 is a current distribution diagram of the second resonant mode shown in FIG. 5;

fig. 7 is a schematic structural diagram of a third antenna assembly provided in fig. 4, having a first matching circuit, a first matching network, a second matching circuit and a second matching network;

FIG. 8 is a current distribution diagram of the third resonant mode shown in FIG. 5;

FIG. 9 is a current distribution diagram of the fourth resonant mode shown in FIG. 5;

FIG. 10 is a current distribution diagram of the fifth resonant mode shown in FIG. 5;

Fig. 11 is a schematic structural diagram of a third antenna assembly provided in fig. 7 with a first tuning circuit and a second tuning circuit;

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

fig. 13 is a schematic structural diagram of a second tuning circuit according to an embodiment of the present disclosure;

fig. 14 is a schematic structural diagram of a third tuning circuit according to an embodiment of the present disclosure;

FIG. 15 is a state diagram of the first, third, fourth, fifth resonant modes when the second resonant mode is tuned between B32, B3, B1_B41;

FIG. 16 is a current distribution plot of a third resonant mode excited by the second feed;

fig. 17 is a schematic structural diagram of an antenna assembly provided in the present application applied to an electronic device;

fig. 18 is a schematic structural diagram of an antenna assembly provided in the present application applied to a foldable electronic device.

Detailed Description

The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. It is apparent that the embodiments described herein are only some embodiments, not all embodiments. All other embodiments, which can be made by a person of ordinary skill in the art based on the embodiments provided herein without any inventive effort, are within the scope of the present application.

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

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

As shown in fig. 1, fig. 1 is a schematic structural diagram of an electronic device 100 according to an embodiment of the present application. The electronic device 100 includes, but is not limited to, devices with communication functions such as a cell phone, tablet computer, notebook computer, wearable device, unmanned aerial vehicle, robot, digital camera, etc. In the embodiment of the present application, a mobile phone is taken as an example for illustration, and other electronic devices may refer to the embodiment.

For antenna designs on electronic devices such as mobile phones, the space of the electronic device is limited, and multiple resonant modes are often generated on the same antenna, for example, modes of a 1.45GHz-2.5GHz band and modes of a low frequency band (less than 1 GHz) resonate on the same antenna, and when B32 (1452-1495.9 MHz), B3 (1710-1880 MHz), B1 (1920-2170 MHz), and B40 (2300-2400 MHz) within the 1.45GHz-2.5GHz range are tuned, the modes of the low frequency band are also shifted toward higher frequencies or lower frequencies. If a specific carrier aggregation (Carrier Aggregation, CA) combination or dual connectivity (eNB NR Dual Connection, ENDC) combination is to be satisfied, a specific frequency ratio needs to be designed. For example, in order to fit the b20+b3+b1+b40 combination, when the mode of the 1.45GHz-2.5GHz band is switched between B3 and B1, the mode of the low frequency band may be shifted to the higher frequency band of B20, such as B5, and B20 cannot be satisfied, and the feed position is limited, so that the design lacks elasticity in a limited space, or more antenna switches are required to maintain the frequency ratio, which increases the cost.

In addition, the available bandwidth of the N78 band is usually wider than that of the low frequency and the intermediate frequency, the data transmission capacity achieved by the available bandwidth is dominant, and how to support the N78 band is a technical problem to be solved. If the mode of the 1.45GHz-2.5GHz band and the mode of the N78 are resonated in the same antenna, when the mode of the N78 is tuned between B32 (1452-1495.9 MHz), B3 (1710-1880 MHz), B1 (1920-2170 MHz) and B40 (2300-2400 MHz) in the 1.45GHz-2.5GHz band, the mode of the N78 is also followed by a large offset, such as an offset of 200-400 MHz, the N78 band of the intermediate frequency (1.7-2.4 GHz) at the time of switching cannot be satisfied at the same time, which is too low for the support of the combination of ENDC and CA, and the throughput of the user cannot be improved.

The antenna assembly provided by the application can realize independent tuning of the low-frequency antenna and the middle-high frequency band at least so as to support more frequency band combinations and improve throughput. In addition, the implementation of the method and the device can realize independent tuning of the medium-high frequency band and the N78 frequency band, N78 is kept always when the medium-high frequency band is tuned, so that the requirement on the N78 always is met, more ENDC and CA combinations are tuned, and the throughput of a user is improved.

Referring to fig. 1, an antenna assembly 100 includes a first radiating branch 10, a second radiating branch 20, and a first feed 30. Specifically, referring to fig. 1, the first radiating branch 10 includes a first ground terminal 11, a first feeding point a, and a first opening terminal 12, which are sequentially disposed. The second radiating stub 20 includes a second open end 21 and a second ground end 22. The first open end 12 and the second open end 21 are opposite to each other with a gap therebetween, which is a coupling gap 40, wherein the first radiation branch 10 and the second radiation branch 20 are coupled by the coupling gap 40.

Referring to fig. 1, the first feed 30 is electrically connected to the first feeding point a.

Referring to fig. 2, a first feed 30 is used to excite the first radiating branch 10 to generate a first resonant mode a. Wherein the length from the first feeding point a to the first open end 12 is less than or equal to 20% of the length of the first radiating branch 10, so that the first feed 30 excites at least one coupled resonance mode on the second radiating branch 20. Optionally, the length from the first feeding point a to the first opening end 12 may be 20%, 19%, 18%, 10%, 5%, 1% of the length of the first radiating branch 10, so that the first feeding point a is located close to the second radiating branch 20, which is beneficial for the first feed 30 to excite at least one coupled resonance mode on the second radiating branch 20. Referring to fig. 2, modes c, d, e in fig. 2 are coupled resonance modes. In other embodiments, the coupled resonant mode may be one, such as mode c, or mode d, or mode e. The present application is not limited in this regard.

In fig. 2, f1, f2, and f3 represent different frequency bands, and the values of f1, f2, and f3 are not specifically limited in this application. The frequency bands supported by modes c, d, e in fig. 2 are higher than the frequency bands supported by mode a, which may be higher than the frequency bands supported by modes c, d, e in other embodiments.

Wherein, since the coupled resonance mode and the first resonance mode a are generated in different radiation branches respectively, the coupled resonance mode and the first resonance mode a can be tuned independently.

According to the antenna assembly 100 provided by the application, the first radiating branch 10 and the second radiating branch 20 are coupled through the coupling gap 40, and the length from the first feed point A to the first opening end 12 is designed on the first radiating branch 10 to be less than or equal to 20% of the length of the first radiating branch 10, so that the position of the first feed point A is close to the second radiating branch 20, the first feed source 30 is facilitated to excite at least one coupling resonance mode on the second radiating branch 20, and the coupling resonance mode and the first resonance mode a are generated in different radiating branches respectively, so that when the first resonance mode a is tuned, the coupling resonance mode is not influenced by the first resonance mode a to generate a large offset, namely, the coupling resonance mode and the first resonance mode a can be tuned mutually independently, in addition, when the first resonance mode a is tuned, the coupling resonance mode can meet the independent tuning of multiple frequency bands in a limited space, the support of multiple frequency band combination is improved, and the transmission rate is further improved.

The radiation branches (e.g., the first radiation branch 10 and the second radiation branch 20) described herein may also be referred to as radiators. Optionally, the radiation branches are made of conductive materials. The radiation branch is a port for receiving and transmitting radio frequency signals of the antenna assembly 100, wherein the radio frequency signals are transmitted in an electromagnetic wave signal form in an air medium. Optionally, the specific shape of the radiation branch is not specifically limited in the present application. The radiation branches comprise, but are not limited to, a metal frame of the mobile phone and a metal bracket radiator positioned near the frame. Wherein a bracket radiator is disposed within the electronic device 1000, including but not limited to a flexible circuit board antenna formed on a flexible circuit board (Flexible Printed Circuit board, FPC), a laser direct structuring antenna by laser direct structuring (Laser Direct Structuring, LDS), a printed direct structuring antenna by printing direct structuring (Print Direct Structuring, PDS), a conductive sheet antenna, etc.

The shape of the radiation branch is not particularly limited. For example, the shape of the radiating branches includes, but is not limited to, a bar, a sheet, a rod, a coating, a film, and the like. The radiation pattern shown in fig. 1 is only an example and is not intended to limit the shape of the radiation pattern provided herein. In this embodiment, the radiating branches are all in a strip shape, and the grounding end and the opening end are respectively two ends of the radiating branches. The application does not limit the extending track of the radiation branch. In this embodiment, the radiation branches are linear. In other embodiments, the radiation branches may also extend along curved or curved tracks. The radiation branches can be lines with uniform width on the extending track, or can be strips with gradual width change, wide areas and the like and unequal widths.

In this embodiment, the first radiation branch 10 and the second radiation branch 20 are capacitively coupled through the coupling slit 40. The "capacitive coupling" means that an electric field is generated between the first radiation branch 10 and the second radiation branch 20, and an electric signal on the second radiation branch 20 can be transmitted to the first radiation branch 10 through the electric field, so that the first radiation branch 10 and the second radiation branch 20 can realize electric signal conduction even in a state of not directly contacting or not directly connecting. Alternatively, the first radiating branch 10 and the second radiating branch 20 may be aligned or substantially aligned (i.e., with a small tolerance in the design process). Of course, in other embodiments, the first radiation branch 10 and the second radiation branch 20 may be further disposed in a staggered manner in the extending direction, so as to form an avoidance space.

Referring to fig. 1, the first grounding terminal 11 and the second grounding terminal 22 are grounded. It is understood that "grounding" as used herein refers to electrically connecting to a reference ground or to a reference ground system GND, and the electrical connection manner includes, but is not limited to, direct soldering, or indirect electrical connection by way of coaxial lines, microstrip lines, conductive clips, conductive adhesives, etc. The reference ground system GND may be a single integral structure or a plurality of structures that are independent of each other but electrically connected to each other.

The first feed source 30 is electrically connected to the radio frequency transceiver chip. The first feed source 30 feeds the radio frequency signal emitted by the radio frequency transceiver chip into the first radiation branch 10 through the first feed point a, and the radio frequency signal can excite the first radiation branch 10 to generate a resonant current, so as to form a first resonant mode a, so as to support a frequency band corresponding to the resonant current. In addition, since the first feeding point a is located close to the coupling slot 40, the first feed source 30 can also excite to generate a resonant current on the second radiating branch 20, so as to form a coupled resonant mode, so as to support a frequency band corresponding to the resonant current. Wherein the frequency band supported by the first resonant mode a is different from the frequency band supported by the coupled resonant mode. For example, the frequency bands supported by the first resonant mode a include, but are not limited to, electromagnetic wave signals that are at least one of an LB frequency band, an MHB frequency band, a UHB frequency band, a Wi-Fi frequency band, a GNSS frequency band. The LB frequency band refers to a frequency band lower than 1000MHz (excluding 1000 MHz). The MHB band is a band of 1000MHz-3000MHz (including 1000MHz and excluding 3000 MHz). The UHB band refers to a band of 3000MHz-10000MHz (including 3000 MHz). Wi-Fi frequency bands include, but are not limited to, at least one of Wi-Fi 2.4G, wi-Fi 5G, wi-Fi 6E, and the like. GNSS, which is collectively known as Global Navigation Satellite System and chinese name global navigation satellite system, includes global positioning system (Global Positioning System, GPS), beidou, global satellite navigation system (Global Navigation Satellite System, GLONASS), galileo satellite navigation system (Galileo satellite navigation system, galileo), regional navigation system, and the like.

In this embodiment, please refer to fig. 3a, and the dashed arrow in fig. 3a is shown. The resonant current of the first resonant mode a passes through the first feed point a from the first feed source 30 and returns to ground from the first ground terminal 11. The first resonant mode a is generated by a loop (loop) antenna formed by the first feed 30, the first radiating branch 10 and the first ground 11. Optionally, the resonant current of the first resonant mode a operates in a 1/4 wavelength mode.

Optionally, the frequency band supported by the first resonant mode a includes at least a portion of the frequency band in 1.45-2.4 GHz. For example, the frequency band supported by the first resonance mode a covers at least one of B32 (1452-1495.9 MHz), B3 (1710-1880 MHz), B1 (1920-2170 MHz), B40 (2300-2400 MHz), and the like. The first resonant mode a of the 1/4 wavelength mode of the mid-band (1450-2400 MHz) is resonated between the first ground 11 of the first radiating branch 10 and the first feeding point a by designing the effective electrical length of the first radiating branch 10.

Optionally, the first radiating branch 10 is a part of a frame of the middle frame of the mobile phone, and the width of the first radiating branch 10 is relatively wide, for example, 7-8mm. The length of the first radiating stub 10 may be less than or equal to 18mm. For example, the length of the first radiating stub 10 may be 17.2mm. The first resonance mode a of the 1/4 wavelength mode of the mid-band (1450-2400 MHz) is resonated between the first ground 11 of the first radiating branch 10 and the first feeding point a, and the first radiating branch 10 has a relatively short physical length. The length of the first radiating branch 10 provided in this embodiment is shorter than that of a common radiating branch supporting a middle frequency band, which is beneficial to miniaturization of the antenna assembly 100 and can reduce the space occupied on the electronic device 1000.

For example, the length of the first radiating stub 10 may be 17.2mm (for example only, not limited to this data), and the distance between the first feeding point a and the first open end 12 is 3.5mm (for example only, not limited to this data). On the one hand, the first feeding point a is close to the coupling slot 40, so that the first coupling slot 40 is beneficial to coupling energy to the second radiation branch 20 through the coupling slot 40, and different modes can be excited through the second grounding end 22 and the matching design, for example, a third resonance mode and a fifth resonance mode are excited subsequently. On the other hand, by designing the first feeding point a to be close to the first opening end 12 with a relatively large space between the first feeding point a and the first ground end 11, a key circuit board and other devices can be provided, improving space utilization and compactness of device arrangement within the electronic apparatus 1000.

Optionally, the frequency bands supported by the coupled resonance modes include at least one of 2.5-2.69GHz (N41), 3.3-3.8GHz (N78), 4.8-5GHz (N79).

The coupled resonance mode generated by the antenna assembly provided in fig. 3a may be the mode d in fig. 2, and the current distribution diagram of the mode d may refer to fig. 9. For example supporting the 3.3-3.8GHz (N78) band.

Referring to fig. 3b, in fig. 3b, a matching circuit M is disposed on the second radiation branch 20 to return to ground, so that a part of current on the second radiation branch 20 flows through the matching circuit M to return to ground. The location where the matching circuit M is electrically connected may be located between the second open end 21 and the intermediate point of the second radiation stub 20. The antenna assembly structure provided in fig. 3b can support three coupled resonance modes, and the frequency bands supported by the three coupled resonance modes are different, including the mode d, the mode c (the current distribution diagram refers to fig. 8) and the mode e (the current distribution diagram refers to fig. 10) are further added. For example, the three modes support three frequency bands of 2.5-2.69GHz (N41), 3.3-3.8GHz (N78), and 4.8-5GHz (N79), respectively, which are not limited in this application. By providing signal sources of corresponding frequency bands and designing the effective electric length of the first radiation branch 10, the first radiation branch 10 can generate a first resonance mode a supporting a frequency band within 1.45-2.4GHz, and the second radiation branch 20 can generate a third resonance mode c supporting 2.5-2.69GHz, a fourth resonance mode d supporting 3.3-3.8GHz and a fifth resonance mode e supporting 4.8-5GHz under the excitation of the first feed source 30, because the first resonance mode a, the third, fourth and fifth resonance modes are respectively generated by different radiation branches, so when the first resonant mode a is tuned, for example, the first resonant mode a is tuned between B32 (1452-1495.9 MHz), B3 (1710-1880 MHz), B1 (1920-2170 MHz), and B40 (2300-2400 MHz), the third resonant mode c, the fourth resonant mode d, and the fifth resonant mode e may remain normal, that is, the antenna assembly 100 provided in the present application may support a CA combination of b32+b41+n78+n79, may support a CA combination of b3+b41+n78+n79, may support a CA combination of b1+b41+n78+n79, may support a CA combination of b40+b41+n78+n79, may support a CA combination of b1+b3+b41+n78+n79, and the like. Thus, the antenna assembly 100 provided in the present application supports multiple CA combinations of multiple frequency bands, and has wide coverage of the frequency bands, so that the data transmission rate can be effectively improved.

Of course, in other embodiments, the coupled frequency band may also include a frequency band, e.g., one of coupled resonant mode supports B41, N78, N79; alternatively, the coupled frequency band may also include two frequency bands, e.g., coupled resonant modes support B41 and N78, etc.

The application provides a multi-mode antenna design, which not only can cover a plurality of operation frequency bands, but also can be tuned relatively independently in a first resonance mode a of an intermediate frequency and third, fourth and fifth resonance modes of a medium-high frequency band, can select a feed-in position in design to meet a limited design space, and can meet the requirements of various CA combinations and ENDC combinations through the selection of frequency tuning.

Optionally, referring to fig. 4, the second radiating branch 20 further includes a second feeding point B disposed between the second open end 21 and the second ground end 22. It will be appreciated that the second feeding point B is the position in fig. 3B where the matching circuit M is electrically connected to the second radiating stub 20. The antenna assembly 100 also includes a second feed 50.

Referring to fig. 4 and 5, the second feed 50 is electrically connected to the second feeding point B, and is configured to excite the second radiating branch 20 to generate a second resonant mode B. The frequency band supported by the second resonance mode b is smaller than 1GHz. In other words, the second radiating stub 20 and the second feed 50 may act as a low frequency antenna. The low frequency antenna can be used to support B20 band, B5 band, B8 band, B28 band, etc. Since the first resonant mode a and the second resonant mode b are generated in different radiation branches, respectively, the second resonant mode b and the first resonant mode a can be tuned independently of each other.

In fig. 5, f0, f1, f2, and f3 represent different frequency bands, and the values of f0, f1, f2, and f3 are not specifically limited in this application. In fig. 5, the frequency bands supported by the modes c, d and e are higher than the frequency band supported by the mode a, and the frequency band supported by the mode a is higher than the frequency band supported by the mode b. In other implementations, the frequency bands supported by modality b may be higher than the frequency bands supported by one or more of modalities a, c, d, e.

Specifically, referring to fig. 6, a dashed arrow portion of fig. 6 is shown. The resonant current of the second resonant mode b flows through the second open end 21 to the second ground end 22. The second resonant mode b is generated by an inverted-F antenna formed by the second feed 50, the second open end 21 and the second ground end 22. The second resonant mode b operates in the 1/4 wavelength mode.

Optionally, the frequency band supported by the second resonant mode b is a frequency band less than 1 GHz. The second resonant mode b of the 1/4 wavelength mode of the low frequency (790-1000 MHz) is resonated between the second ground 22 and the second open end 21 of the second radiating branch 20 by designing the effective electrical length of the second radiating branch 20.

Optionally, the first radiating branch 10 is a part of a frame of the middle frame of the mobile phone, and the width of the first radiating branch 10 is relatively wide, for example, 7-8mm. The length of the second radiating stub 20 may be less than or equal to 35mm. For example, the second radiating stub 20 may have a length of 33.4mm, such that a second resonant mode b of a 1/4 wavelength mode of a low frequency band (less than 1 GHz) is resonable between the second ground 22 and the second open end 21 of the second radiating stub 20, and the second radiating stub 20 has a relatively short physical length.

For example, the length of the second radiating stub 20 may be 33.4mm (for example only, not limited to this data), and the distance between the second feeding point B and the second open end 21 is 12.1mm (for example only, not limited to this data).

When the feed point is at the middle position between the open end and the grounding end, the input impedance of the feed point can be better matched and has better radiation performance, and the closer to the open end, the loop antenna mode is favorably excited. The second feeding point B is approximately 12.1mm away from the second opening end 21, and at this time, the mode excited by the second feed source 50 is at a low frequency, so that the radiation performance of the low frequency is met, and the mode of the IFA antenna, namely the coupling resonance mode and the like, can be excited.

The length of the second radiating branch 20 provided in this embodiment is shorter than that of a common radiating branch supporting a low frequency band, which is beneficial to the overall miniaturization of the antenna assembly 100 and can reduce the space occupied on the electronic device 1000. The lengths of the first radiation branch 10 and the second radiation branch 20 provided in the present embodiment are both shorter, the overall size of the antenna assembly 100 is small, and for the foldable electronic device 1000, the antenna assembly 100 cannot span the rotation axis, so that the antenna assembly 100 with relatively smaller design is required, and the antenna assembly 100 provided in the present embodiment is shorter and applicable to the foldable electronic device 1000.

Optionally, referring to fig. 7, the antenna assembly 100 further includes a first feeding port 13 and a second feeding port 23. One end of the first feed port 13 is electrically connected to the first feed point a, and the other end of the first feed port 13 is electrically connected to the first feed source 30. One end of the second feeding port 23 is electrically connected to the second feeding point B, and the other end of the second feeding port 23 is electrically connected to the second feed source 50.

Optionally, referring to fig. 7, the antenna assembly 100 further includes a first matching circuit M1 and a second matching circuit M2.

One end of the first matching circuit M1 is electrically connected to the second feeding point B, and the other end of the first matching circuit M1 is grounded. Specifically, one end of the first matching circuit M1 is electrically connected to the second feeding port 23, and the other end of the first matching circuit M1 is grounded. By designing the first matching circuit M1, the first matching circuit M1 is in a band-stop state for some frequency bands and in a band-pass state for some frequency bands. For example, the first matching circuit M1 is in a band-stop state for the low-frequency signal generated by the second feed source 50 and in a band-pass state for the medium-high frequency signal generated by the first feed source 30, so that the low-frequency signal generated by the second feed source 50 is not transmitted to the second radiation branch 20 via the second feed port 23 but is not grounded via the first matching circuit M1. The mid-high frequency signal generated by the first feed 30 is transmitted to the second radiating branch 20 through the first feed port 13, the first feed point a and the coupling slot 40, and because the first matching circuit M1 is in a bandpass state for the mid-high frequency signal, part of the mid-high frequency signal on the second radiating branch 20 can go through the first matching circuit M1 to the ground, so as to avoid the mid-high frequency signal on the second radiating branch 20 from affecting the second feed 50.

Alternatively, the first matching circuit M1 may be a capacitor, an inductor, a device connected in series between a capacitor and an inductor, a device connected in parallel between the above-mentioned serial device and a capacitor, a device connected in parallel between the above-mentioned serial device and an inductor, a device connected in parallel between two above-mentioned serial devices, a device connected in parallel between two above-mentioned parallel devices, or a device connected in series between two above-mentioned parallel devices.

In this embodiment, the first matching circuit M1 is a capacitor.

One end of the second matching circuit M2 is electrically connected to the first feeding point a, and the other end of the first matching circuit M1 is grounded. Specifically, one end of the second matching circuit M2 is electrically connected to the first feeding port 13, and the other end of the second matching circuit M2 is grounded. By designing the second matching circuit M2, the second matching circuit M2 is in a band-stop state for some frequency bands and in a band-pass state for some frequency bands. For example, the second matching circuit M2 is in a band-stop state for the mid-high frequency signal generated by the first feed 30 and in a band-pass state for the low frequency signal generated by the second feed 50, so that the mid-high frequency signal generated by the first feed 30 is not transmitted to the first radiating branch 10 via the first feed port 13, but is not grounded via the second matching circuit M2. Since the second matching circuit M2 is in a band-pass state for the low-frequency signal, a part of the low-frequency signal on the first radiation branch 10 can go through the second matching circuit M2 to the ground, so as to avoid the low-frequency signal on the first radiation branch 10 from affecting the first feed source 30.

Alternatively, the second matching circuit M2 may be a capacitor, an inductor, a device connected in series between a capacitor and an inductor, a device connected in parallel between the above-mentioned serial device and a capacitor, a device connected in parallel between the above-mentioned serial device and an inductor, a device connected in parallel between two above-mentioned serial devices, a device connected in parallel between two above-mentioned parallel devices, or a device connected in series between two above-mentioned parallel devices.

As can be appreciated, referring to fig. 7, the antenna assembly 100 further includes a first matching network P1 and a second matching network P2.

The first matching network P1 is electrically connected between the first feed port 13 and the first feed source 30, and the first matching network P1 is configured to adjust the impedance of the first radiating branch 10, so that the impedance of the first radiating branch 10 is better matched with the middle-high frequency band, thereby generating a resonant mode of the required frequency band, and having better radiation performance in the required frequency band. The first matching network P1 may include a tuning circuit for tuning the first resonant mode a (middle-high frequency band), and tuning the resonant frequency point of the first resonant mode a, so that the antenna assembly 100 supports different middle-high frequency bands, and the frequency band combination supported by the antenna assembly 100 is increased. Optionally, the first matching network P1 includes a circuit structure formed by a plurality of elements such as a capacitor, an inductor, and a resistor.

The second matching network P2 is electrically connected between the second feed port 23 and the second feed source 50, and the second matching network P2 is used for adjusting the impedance of the second radiating branch 20, so that the impedance of the second radiating branch 20 is better matched with the low frequency band to generate a resonant mode of the required frequency band, and the resonant mode has better radiation performance in the required frequency band. The second matching network P2 may include a tuning circuit for tuning the second resonant mode b (low frequency band), and is used for tuning the resonant frequency point of the second resonant mode b, so that the antenna assembly 100 supports different low frequency bands, and the frequency band combination supported by the antenna assembly 100 is increased. Optionally, the second matching network P2 includes a circuit structure formed by a plurality of elements such as a capacitor, an inductor, and a resistor.

Alternatively, the first matching circuit M1 may be part of the second matching network P2. The second matching circuit M2 may be part of the first matching network P1.

Optionally, the second feeding point B is located on the second radiating branch 20 closer to the middle of said second radiating branch 20 than to the end. In other words, the distance between the second feeding point B and the intermediate point of the second radiating stub 20 is smaller than the distance between the second feeding point B and the end of the second radiating stub 20. Because the input impedance of the second feeding point B can be better matched and the second radiating stub 20 has better radiation performance when the position of the second feeding point B is selected to be close to the intermediate position between the second open end 21 and the second ground end 22, and generally has relatively better performance in the middle of the second radiating stub 20.

Further, a second feeding point B is located between the intermediate point of the second radiating branch 20 and the second open end 21, i.e. close to the first radiating branch 10, to facilitate the first feed 30 exciting a loop (loop) mode of antenna pattern on the first radiating branch 10 and the second radiating branch 20. For example, coupled resonant modes of loop (loop) mode are excited to achieve independent tuning of the coupled resonant modes from the first resonant mode a.

Further, the length from the second feeding point B to the second open end 21 is 30% -40% of the length of the second radiating branch 20, which is advantageous for the first feed source 30 to excite a coupled resonance mode of a loop (loop) mode on the first radiating branch 10 and the second radiating branch 20, and for the input impedance of the second feeding point B to be better matched, and for the second radiating branch 20 to have relatively better radiation performance.

Because the length from the first feeding point a to the first opening end 12 is less than or equal to 20% of the length of the first radiating branch 10, that is, the first feeding point a is close to the first opening end 12, at this time, more radio frequency energy transmitted by the first feed 30 is transmitted to the second radiating branch 20 through the coupling slot 40; and by designing the length from the second feeding point B to the second opening end 21 to be 30% -40% of the length of the second radiating branch 20, that is, the first matching circuit M1 is electrically connected to the position of 30% -40% of the length of the second radiating branch 20, so that the mid-high band signal transmitted to the second radiating branch 20 is transmitted to the first matching circuit M1 at the second feeding point B of the second radiating branch 20 through the second feeding port 23 and is grounded under the first matching circuit M1, so as to excite the coupled resonance mode of the loop (loop) antenna mode.

Optionally, the coupled resonant mode includes a third resonant mode c.

Referring to fig. 8, the dashed arrow portion of fig. 8. The resonant current of the third resonant mode c passes through the first feed point a from the first feed source 30 and the coupling slot 40, and is grounded from the first matching circuit M1. In other words, the first matching circuit M1 is in a low impedance state, i.e. in a short circuit state, for the frequency band supported by the third resonant mode c.

The third resonant mode c is generated by a loop (loop) antenna formed by the first feed 30, the first feed point a, the second feed point B, and the first matching circuit M1. I.e. the third resonant mode c is a loop (loop) antenna mode. The third resonant mode c operates in the 1/4 wavelength mode.

Optionally, the frequency band supported by the third resonant mode c is a frequency band of 2500-2690 MHz.

By designing the effective electrical length of the first radiation branch 10, the position of the first feeding point A on the first radiation branch 10, the effective electrical length of the second radiation branch 20 and the position of the second feeding point B on the second radiation branch 20, a third resonance mode c is generated between the first feeding point A of the first radiation branch 10 and the second feeding point B of the second radiation branch 20, wherein the resonance frequency band of the third resonance mode c is (2500-2690 MHz), and the current of the third resonance mode c works in a 1/4 wavelength mode.

The present application may be used in a scenario where, when the antenna assembly 100 is disposed in a mobile phone, due to a limited design space in the mobile phone, a space between the first open end 12 of the first radiating branch 10 and the first ground end 11 is occupied by other devices (such as a power key), the first feed 30 cannot be disposed between the first open end 12 and the first ground end 11, but is forced to be disposed close to the first open end 12, the first feed point a is close to the coupling slot 40, so that the first radiating branch 10 is beneficial to couple energy to the second radiating branch 20 through the coupling slot 40, and different modes can be excited through the second feed point B and the matching design (the first matching circuit M1), and in addition, by designing the effective electrical length of the first feed point a to the second feed point B, so that the effective electrical length of the path is close to 1/4 medium wavelength of the required frequency band, the first feed 30 is forced to generate a current distribution from the first feed point a to the second feed point B and the first matching circuit M1, thereby generating a third resonance mode excitation.

In order to avoid interference of the modes of the higher frequency of the second feed 50 to the relatively higher frequency band of the first feed 30, the feed of the second feed 50 is usually configured to be a band-pass circuit or a low-pass circuit (the first matching circuit M1) so as to make the modes falling in the relatively higher frequency band disappear or have a small influence, so when the third resonant mode c is excited by the first feed 30 (the relatively higher frequency band) in the present application, the first matching circuit M1 presents a low impedance to the relatively higher frequency band, and the third resonant mode c is grounded from the first matching circuit M1. The third resonant mode c can be preserved due to the collocation design characteristics of the first matching circuit M1. In other words, the third resonant mode c utilizes the first matching circuit M1 matched by the second feed source 50 and originally used for filtering the relatively high frequency band thereof, and the first matching circuit M1 is not required to be additionally arranged, thereby saving space, manufacturing process and cost.

Optionally, the mid-high frequency signal generated by the first feed 30 may also pass through the second ground 22 and be grounded on the second radiating branch 20 to form a coupled resonance mode, which is referred to as a fourth resonance mode d in this embodiment.

The fourth resonant mode d is generated by a loop antenna formed by the first feed 30, the first feed point a, the first radiating branch 10, the coupling slot 40, the second radiating branch 20, and the second ground 22. I.e. the fourth resonance mode d is a loop (loop) antenna mode.

Referring to fig. 9, the dashed arrow portion of fig. 9. A portion of the resonant current of the fourth resonant mode d flows from the first feed 30 through the coupling slot 40 to a first current zero Q1, and another portion of the resonant current of the fourth resonant mode d flows from the second ground 22 to the first current zero Q1, the first current zero Q1 being located between the second ground 22 and the second feed point B. The fourth resonant mode d operates in the 1/2 wavelength mode. The first current zero Q1 is a point where the current intensity is relatively small.

And the minimum value of the frequency band supported by the fourth resonance mode d is larger than the maximum value of the frequency band supported by the third resonance mode c. For example, the frequency band supported by the third resonant mode c is the 2500-2690MHz frequency band. The frequency band supported by the fourth resonance mode d is 3.3-3.8GHz. By designing the effective electrical length of the first radiation branch 10, the position of the first feeding point A on the first radiation branch 10 and the effective electrical length of the second radiation branch 20, the fourth resonance mode d of the 1/2 wavelength mode of 3.3-3.8GHz can be resonated between the first feeding point A of the first radiation branch 10 and the second grounding end 22 of the second radiation branch 20.

Referring to fig. 10, the dashed arrow portion of fig. 10. The coupled resonant modes further comprise a fifth resonant mode e. The minimum value of the frequency band supported by the fifth resonance mode e is larger than the maximum value of the frequency band supported by the fourth resonance mode d. A part of the resonance current of the fifth resonance mode e flows from the first ground terminal 11 to a second current zero Q2, and another part of the resonance current of the fifth resonance mode e flows from the second feeding point B to the second current zero Q2, and the second current zero Q2 is located between the first open end 12 and the first ground terminal 11. The second current zero Q2 is a point at which the current intensity is relatively small. Referring to fig. 10, the resonant current of the fifth resonant mode e may be grounded through the first matching circuit M1.

The present application may be used in a scenario where, when the antenna assembly 100 is disposed in a mobile phone, due to a limited design space in the mobile phone, a space between the first opening end 12 of the first radiating branch 10 and the first ground end 11 is occupied by other devices (such as a power key), the first feed 30 cannot be disposed between the first opening end 12 and the first ground end 11, but is forced to be disposed close to the first opening end 12, the first feed point a is close to the coupling slot 40, so that the first radiating branch 10 is beneficial to couple energy to the second radiating branch 20 through the coupling slot 40, and a mode different from a matching design can be excited through the second feed point B, in addition, by designing an effective electrical length of the first radiating branch 10, the second opening end 21 to the second feed point B, and the second feed point B through the first matching circuit M1, so that the effective electrical length of the path is close to a 1/2 medium wavelength of a required frequency band, and thus the first feed point a excitation current 30 is excited to generate a mode current flowing from a reference ground to the first ground end 11 through the second ground end 2, and a second feed point Q2 is distributed from the first feed point Q2 to the second zero point Q2, and the second feed point Q2 is further excited by the fifth mode.

In order to avoid interference of the modes of the higher frequency of the second feed 50 to the relatively higher frequency band of the first feed 30, the feed of the second feed 50 is usually designed to be a strip circuit or a low-pass circuit (the first matching circuit M1) so as to make the modes falling in the relatively higher frequency band disappear or have small influence, so when the fifth resonant mode e is excited by the first feed 30 (the relatively higher frequency band) in the application, the first matching circuit M1 presents low impedance to the relatively higher frequency band, and the fifth resonant mode e can be reserved from the place below the first matching circuit M1 due to the collocation design characteristic of the first matching circuit M1. In other words, the fifth resonant mode e utilizes the first matching circuit M1 matched by the second feed source 50 and originally used for filtering the relatively high frequency band thereof, and the first matching circuit M1 is not required to be additionally arranged, thereby saving space, manufacturing process and cost.

Referring to fig. 11, the antenna assembly 100 further includes a first tuning circuit T1. The first tuning circuit T1 is electrically connected to the first feeding point a or to a first radiating branch 10 between the first feeding point a and the first ground 11. Specifically, the first tuning circuit T1 may be electrically connected to the first feeding port 13. The first tuning circuit T1 is configured to tune a frequency band of the first resonant mode a. For example, the first resonant mode a supports the B1 band for a period of time, and the first resonant mode a supports the B3 band by tuning of the first tuning circuit T1. In this way, by setting the first tuning circuit T1, the first resonant mode a can support multiple frequency bands, so as to increase the frequency band combination supported by the antenna assembly 100, and improve the throughput and the data transmission rate of the antenna assembly 100.

Optionally, the first tuning circuit T1 includes an antenna switch and/or an adjustable capacitor.

Specifically, the first tuning circuit T1 includes, but is not limited to, a capacitor, an inductor, a device connected in series between a capacitor and an inductor, a device connected in parallel between the above-mentioned device connected in series with a capacitor, a device connected in parallel between the above-mentioned device connected in series with an inductor, a device connected in parallel between two devices connected in series, a device connected in parallel between two devices connected in parallel between each other, etc.

In a first embodiment of the first tuning circuit T1, referring to fig. 12, the first tuning circuit T1 further includes a plurality of first tuning branches T11. One end of each of the plurality of first tuning branches T11 is electrically connected to one end of the first switch circuit K1, and the other end of the first switch circuit K1 is electrically connected to the first feed port 13. I.e. the first switching circuit K1 is a single pole, multi throw switch. The other ends of the first tuning branches T11 are grounded. The plurality of first tuning branches T11 are used for tuning the size of the frequency band supported by the first resonant mode a.

The impedance value of each of said first tuning branches T11 is different. For example, the plurality of first tuning branches T11 are a plurality of capacitive devices having different capacitance values. Alternatively, the plurality of first tuning branches T11 are a plurality of inductance devices having different inductance values. Alternatively, the plurality of first tuning branches T11 includes a plurality of capacitive devices having different capacitance values, and includes a plurality of inductive devices having different inductance values. The first switch circuit K1 is electrically connected to different devices, so as to adjust the equivalent electrical length of the first tuning branch T11, further adjust the effective electrical length of the first radiation branch 10, and further adjust the size of the frequency band supported by the first resonant mode a.

In a second embodiment of the first tuning circuit T1, referring to fig. 13, the first tuning circuit T1 includes a first adjustable capacitor C1, where the size of the first adjustable capacitor C1 is adjustable, so as to tune the size of the frequency band supported by the first resonant mode a. The first adjustable capacitor C1 is a capacitor with an adjustable capacitance value, so that the impedance value of the first tuning circuit T1 is adjustable by adjusting the capacitance value of the capacitor, so that the effective electrical length of the first tuning circuit T1 is further adjusted, the effective electrical length of the first radiation branch 10 is further adjusted, and the size of the frequency band supported by the first resonance mode a is further adjusted.

Of course, the first tuning circuit T1 may also be a combination of the first embodiment and the second embodiment, for example, referring to fig. 14, the first tuning branch T11 includes the first tunable capacitor C1.

Since the first tuning circuit T1 is connected to the first radiation branch 10, it can tune the effective electrical length of the first radiation branch 10, thereby tuning the first resonance mode a generated on the first radiation branch 10, while having relatively small influence on the second, third, fourth and fifth resonance modes e mainly generated on the second radiation branch 20. The frequency bands supported by the second, third, fourth and fifth resonant modes e can be kept constant when the first resonant mode a is tuned by the first tuning circuit T1, so as to support the frequency bands supported by the second, third, fourth and fifth resonant modes e and tune the frequency bands supported by the first resonant mode a, increase the frequency band combination supported by the antenna assembly 100, improve throughput and data transmission rate.

Alternatively, the first tuning circuit T1 may be part of the second matching circuit M2 or the first matching network P1. The second tuning circuit T2 may be part of the first matching circuit M1 or the second matching network P2.

Referring to fig. 11, the antenna assembly 100 further includes a second tuning circuit T2. The second tuning circuit T2 is electrically connected to the second radiating branch 20. Alternatively, the second tuning circuit T2 may be electrically connected to the second feed port 23, or directly to the branch of the second radiating branch 20. The second tuning circuit T2 is configured to tune a frequency band of the third resonant mode c and/or the second resonant mode b. The second tuning circuit T2 may tune the third resonant mode c to enable the third resonant mode c to be designed with a frequency ratio that is greater than that of the second resonant mode b, support more CA combinations, or may be designed as a match to improve antenna efficiency within a single frequency band (e.g., the frequency band supported by the third resonant mode c).

In addition, the second tuning circuit T2 can also enable the second resonant mode b of the low-frequency antenna to obtain tuning freedom, so as to support more ENDC combinations and CA combinations.

The structure of the second tuning circuit T2 may refer to the structure of the first tuning circuit T1, and will not be described herein.

Referring to fig. 15, fig. 15 is a graph of S-parameters of an antenna assembly 100 according to an embodiment of the present disclosure. The antenna assembly 100 generates a first resonant mode a, a second resonant mode b, a third resonant mode c, a fourth resonant mode d, and a fifth resonant mode e.

Referring to the curves S2,2_b32, S2,2_b3, and S2, 2_b41 in fig. 15, it can be seen that the second resonance mode B can be always kept when the first resonance mode a is tuned, for example, the first resonance mode a is tuned between the frequency bands B32 (1452-1495.9 MHz), B3 (1710-1880 MHz), and B1 (1920-2170 MHz), and furthermore, the third resonance mode c, the fourth resonance mode d, and the fifth resonance mode e can be always kept.

It is understood that the frequency band point positions of the resonant modes in fig. 15 are merely examples, and in other embodiments, one second resonant mode may support two frequency bands simultaneously, for example, support B3 and B32 simultaneously.

The first resonant mode a may remain normal when the second resonant mode B is tuned, for example when the second resonant mode B is tuned between the B20 band, the B5 band, the B8 band, the B28 band.

In combination with the above embodiment, when the first resonant mode a is tuned, the second, third, fourth and fifth resonant modes can be kept normal, and the second resonant mode B can be tuned independently, so that the CA combination of b20+b32+b41+n78+n79, the CA combination of b20+b3+b41+n78+n79, the CA combination of b20+b1+b41+n78+n79, the CA combination of b20+b40+b41+n78+n79, the CA combination of b20+b1+b3+b41+n78+n79, and the like can be supported, and the above B20 can be replaced with the low frequency band such as the B5 frequency band, the B8 frequency band, the B28 frequency band, and the like. In this way, the antenna assembly 100 provided in the present application can support more bands of CA combinations and ENDC combinations, and improve throughput, so as to improve the transmission rate.

In addition, because the generation of the coupling resonance mode uses the radiation branches of the original low-frequency antenna, the antenna assembly 100 generates the required coupling resonance mode without adding branches, the antenna assembly 100 can realize independent tuning of the second resonance mode b supporting low frequency and the first resonance mode a supporting 1.45-2.4GHz, the first resonance mode a supporting 1.45-2.4GHz and the coupling resonance modes supporting 2.5-2.69GHz, 3.3-3.8GHz and 4.8-5GHz, multiple frequency bands combined by multiple low-frequency bands and multiple medium-frequency bands can be tuned in practical application, the frequency of N78 is always kept, and the antenna does not occupy extra space, so that the independently tunable multi-frequency-band antenna is formed in the electronic device 1000 with limited space.

In another embodiment provided herein, referring to fig. 16, the third resonant mode c may also be excited by the second feed 50. Specifically, the antenna assembly 100 in this embodiment is substantially the same as the antenna assembly 100 in the above embodiment, and the main difference is that the second matching network P2 is in a low impedance state for the frequency band supported by the second resonant mode b and the third resonant mode c, and in a band-stop state for other frequency bands. And the second matching circuit M2 is in a low impedance state for the frequency band supported by the third resonant mode c.

The second feed 50 is also used to excite the second radiating stub 20 to produce a third resonant mode c. Referring to the dashed joint in fig. 16, the resonant current of the third resonant mode c passes from the second feed 50, through the second feed point B, the coupling slot 40, and is grounded from the second matching circuit M2.

Referring to table 1, table 1 is an efficiency chart of each frequency band when the third resonant mode c is excited by the first feed 30 and the second feed 50, respectively. The third resonant mode c is excited by the first feed source 30 and the second feed source 50 respectively, so that the impedance matching of the radiation branches to each frequency band is different. When the third resonant mode c is excited by the first feed source 30, the absolute values of the intermediate frequency (1.9-2.4 GHz) and the N78 frequency band corresponding to the third resonant mode c are relatively smaller, and the performance is better. When the third resonant mode c is excited by the second feed source 50, the absolute value of the efficiency of the intermediate frequency (1.4-2.2 GHz) mode corresponding to the second resonant mode b is relatively smaller, and the high-performance resonant mode c has better performance.

TABLE 1

In this application, regardless of how the first resonant mode a and the second resonant mode b are switched by the tuning circuit, the third resonant mode c and the fourth resonant mode d may be frequent at any time, and thus, a higher-order CA combination (at least 4CA combinations or more) may be greatly satisfied.

Referring to fig. 17, for the electronic device 1000 described herein, the electronic device 1000 further includes a conductive bezel 200. The second radiation branches 20 and the first radiation branches 10 are all part of the conductive frame 200, that is, the conductive frame 200 is used as a radiation branch of the antenna assembly 100, so that the occupied space of the antenna assembly 100 in the electronic device 1000 is reduced, and the conductive frame 200 is reused, thereby facilitating miniaturization of the whole machine. Optionally, taking the electronic device 1000 as an example of a mobile phone, the conductive frame 200 is a frame body connected between the display screen and the rear cover, and the conductive frame 200 is made of a conductive material, and further, the conductive frame 200 may be made of a metal conductive material, so that the antenna design is satisfied, the structural strength is improved, and the metal texture is increased.

Alternatively, the electronic device 1000 may be a device that is not foldable, or a foldable electronic device, or a stretchable electronic device, or the like.

In general, a plurality of antennas, such as 8 antennas and 12 antennas, are required to be disposed on the conductive frame 200 of the mobile phone, and for a foldable mobile phone, the long side of the foldable mobile phone is divided into an upper portion and a lower portion due to the arrangement of the rotating shaft, so that the radiating branches of the antenna assembly 100 cannot span the rotating shaft, resulting in limited length of the radiating branches on the long side. The long side of the handset is between 140mm and 170mm in size, and when the long side of the handset is foldable, the long side is relatively small in size after folding, for example between 65mm and 80 mm. The long side of the radiation branch of the antenna assembly 100 supporting low frequency and medium frequency is relatively long, for example, the radiation branch of the low frequency antenna is 57.8mm, and the length of the radiation branch of the medium frequency antenna is 21.8mm, which cannot be disposed on the long side of the foldable mobile phone. Therefore, how to design the antenna assembly 100 so that it can be disposed on the long side of the foldable mobile phone is a technical problem to be solved.

According to the antenna assembly 100, the positions of the first feeding point A and the second feeding point B of the antenna assembly 100 are designed, so that the first resonant mode a to the fifth resonant mode e are designed on the antenna assembly 100, the low frequency and the intermediate frequency can be independently tuned, the intermediate frequency and the intermediate frequency can be independently tuned, the length of the first radiating branch 10 is smaller than or equal to 18mm under the condition that the mode support is met, the length of the second radiating branch 20 is smaller than or equal to 35mm, and the antenna assembly is better compatible to a foldable mobile phone without crossing a rotating shaft, and can support more CA combinations and ENDC combinations.

Referring to fig. 18, a specific structure of the antenna assembly 100 applied to the electronic device 1000 includes the conductive frame 200 including a pair of long sides 210, a pair of short sides 220, and a rotation shaft 230. The pair of long sides 210 refers to two long sides 210 disposed opposite to each other in the Y-axis direction, and the pair of short sides 220 refers to two short sides 220 disposed opposite to each other in the X-axis direction. Wherein the dimension of the long side 210 is greater than the dimension of the short side 220.

The pair of short sides 220 is parallel to the rotation axis 230. I.e., the rotation shaft 230 is disposed in the X-axis direction. In the present embodiment, the rotation shaft 230 divides the pair of long sides 210 into two parts of the same size. In other embodiments, however, the shaft 230 may divide the pair of long sides 210 into two portions of different sizes.

A pair of the long sides 210 are folded along with the rotation of the rotation shaft 230. The second radiation branch 20 and the first radiation branch 10 are located on one long side 210 and on the same side of the rotating shaft 230. That is, the rotation shaft 230 divides the pair of long sides 210 into four parts, and the second radiation stub 20 and the first radiation stub 10 may be provided at any one of the four parts.

Of course, in other embodiments, the first and second radiation branches 10 and 20 may be disposed on the short sides 220, at corners, etc.

For the electronic device 1000, the conductive frame 200 of the electronic device 1000 is further provided with keys, such as a volume key, a power key, etc., and the keys are correspondingly provided with a circuit board of the keys so as to be abutted with the keys. When the first radiating branch 10 and the second radiating branch 20 of the antenna assembly 100 are disposed on the conductive frame 200, the first ground terminal 11 is electrically connected to the reference ground in the electronic device 1000, and the first feeding point a is electrically connected to the second matching circuit M2, the first matching network P1, the first feed 30, etc. on the circuit board through the first feeding port 13 (e.g., a ground clip). The first feeding point a is relatively close to the first open end 12, so there is a certain space between the first feeding point a and the first ground end 11. Similarly, the second feeding point B is close to the second opening end 21, so there is a certain space between the second feeding point B and the second grounding end 22. A key circuit board or the like may be provided between the feeding point and the ground terminal, or between the opening end and the ground terminal, to improve space utilization in the electronic apparatus 1000 and to improve arrangement compactness of each device.

Optionally, referring to fig. 18, the electronic device 1000 further includes a first key circuit board 300 and a second key circuit board 400 disposed inside the conductive bezel 200. Optionally, the first key circuit board 300 is a flexible circuit board of a volume key, and the second key circuit board 400 is a flexible circuit board of a power key. The first key circuit board 300 is disposed adjacent to the second radiating branch 20, and an orthographic projection of the first key circuit board 300 on the second radiating branch 20 is located between the second grounding end 22 and the second opening end 21. The orthographic projection of the second key circuit board 400 on the first radiating branch 10 is located between the first grounding terminal 11 and the first feeding point a.

Since the second radiating branch 20 is relatively long in length and the volume key is relatively long in length, the flexible circuit board of the volume key may be disposed adjacent to the second radiating branch 20; the flexible circuit board of the power key may be disposed adjacent to the first radiating stub 10 to form a suitable mating pair according to different sizes, improving arrangement compactness and rationality of each device.

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

Claims

1. An antenna assembly, comprising:

2. The antenna assembly of claim 1, wherein the frequency bands supported by the first resonant mode comprise at least a portion of 1.45-2.4GHz and the frequency bands supported by the coupled resonant mode comprise at least a portion of 2.5-2.7GHz, 3.3-3.8GHz, and 4.8-5 GHz.

3. The antenna assembly of claim 1, wherein a resonant current of the first resonant mode is returned from the first feed to ground via the first feed point.

4. The antenna assembly of claim 1, further comprising a first tuning circuit electrically connected to the first feed point or to a first radiating branch between the first feed point and the first ground, the first tuning circuit for tuning a frequency band of the first resonant mode.

5. The antenna assembly of claim 4, wherein the first tuning circuit comprises an antenna switch and/or a tunable capacitance.

6. The antenna assembly of any one of claims 1-5, wherein the second radiating stub further comprises a second feed point disposed between the second open end and the second ground end; the antenna assembly further includes a second feed electrically connected to the second feed point for exciting the second radiating branch to produce a second resonant mode.

7. The antenna assembly of claim 6, wherein the frequency band supported by the second resonant mode is less than 1GHz; the resonance current of the second resonance mode flows to the second grounding terminal through the second opening terminal.

8. The antenna assembly of claim 6, wherein a length of the second feed point to the second open end is 30% -40% of a length of the second radiating stub; the antenna assembly further comprises a first matching circuit, one end of the first matching circuit is electrically connected with the second feed point, and the other end of the first matching circuit is grounded; the coupling resonance mode comprises a third resonance mode, and resonance current of the third resonance mode passes through the first feed point and the coupling gap from the first feed source and is grounded from the first matching circuit.

9. The antenna assembly of claim 6, further comprising a second matching circuit, one end of the second matching circuit being electrically connected to the first feed point, the other end of the second matching circuit being grounded;

the length from the second feed point to the second opening end is 30% -40% of the length of the second radiation branch; the second feed source is also used for exciting the second radiation branch to generate a third resonance mode, and the resonance current of the third resonance mode passes through the second feed point and the coupling gap from the second feed source and is grounded from the second matching circuit.

10. The antenna assembly of claim 8 or 9, wherein the coupled resonant mode further comprises a fourth resonant mode, a minimum value of a frequency band supported by the fourth resonant mode being greater than a maximum value of a frequency band supported by the third resonant mode, a portion of resonant current of the fourth resonant mode flowing from the first feed through the coupling slot to a first current zero, another portion of resonant current of the fourth resonant mode flowing from the second ground to the first current zero, the first current zero being located between the second ground and the second feed point.

11. The antenna assembly of claim 10, wherein the coupled resonant mode further comprises a fifth resonant mode, a minimum value of a frequency band supported by the fifth resonant mode being greater than a maximum value of a frequency band supported by the fourth resonant mode, a portion of resonant current of the fifth resonant mode flowing from the first ground terminal to a second current zero, another portion of resonant current of the fifth resonant mode flowing from the second feed point to the second current zero, the second current zero being located between the first open end and the first ground terminal.

12. The antenna assembly of claim 8, further comprising a second tuning circuit electrically connected to the second radiating stub, the second tuning circuit for tuning the third resonant mode and/or a frequency band of the second resonant mode.

13. The antenna assembly of any of claims 1-5, 7-9, 11, 12, wherein the length of the first radiating stub is less than or equal to 18mm and the length of the second radiating stub is less than or equal to 35mm.

14. An electronic device comprising an antenna assembly as claimed in any one of claims 1-13.

15. The electronic device of claim 14, further comprising a conductive bezel, the second radiating stub and the first radiating stub being part of the conductive bezel.

16. The electronic device of claim 15, wherein the electronic device is a foldable device, the conductive bezel comprises a pair of long sides, a pair of short sides, and a shaft, the pair of short sides are parallel to the shaft, each long side is folded along with rotation of the shaft, and the second radiation branch and the first radiation branch are located on the same long side and on the same side of the shaft.

17. The electronic device of claim 16, further comprising a first key circuit board and a second key circuit board disposed inside the conductive bezel, the first key circuit board disposed adjacent to the second radiating branch, and an orthographic projection of the first key circuit board on the second radiating branch between the second ground and the second open end, and an orthographic projection of the second key circuit board on the first radiating branch between the first ground and the first feed point.

18. The electronic device of claim 17, wherein the first key circuit board is a flexible circuit board for a volume key and the second key circuit board is a flexible circuit board for a power key.