CN113471678A

CN113471678A - Terminal antenna and electronic equipment

Info

Publication number: CN113471678A
Application number: CN202110650605.5A
Authority: CN
Inventors: 蔡晓涛; 周大为
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2021-10-01
Anticipated expiration: 2041-06-11
Also published as: CN113471678B

Abstract

The application provides a terminal antenna and electronic equipment, and the terminal antenna is arranged in the electronic equipment. The terminal antenna comprises a metal middle frame and a frame; the metal middle frame is fixedly connected with the frame; the frame comprises a first part, a second part, a third part and a fourth part; a first gap is arranged between the first part and the second part, and a second gap is arranged between the second part and the third part; the first part is a first radiator, and the second part is a second radiator; the first radiator is provided with a first grounding point, and the second radiator is provided with a first feeding point, a second grounding point and a third grounding point; the third part is a third radiator, and the fourth part is a fourth radiator; a second feed point and a fourth grounding point are arranged on the fourth radiator; under the condition that the screen occupation ratio is not changed, the working performance of the antenna at the low-frequency band is improved, more antenna working frequency bands are supported, and the requirement of customers is met.

Description

Terminal antenna and electronic equipment

Technical Field

The application relates to the technical field of mobile communication, in particular to a terminal antenna and electronic equipment.

Background

With the development of mobile communication technology, the performance requirements of the terminal handset are more and more stringent. On one hand, the design of the current terminal mobile phone pursues high screen occupation ratio, but the problem brought by the high screen occupation ratio is that the antenna design environment is compressed, so that the antenna clearance area is reduced, the clearance radiation environment is poor, and the antenna radiation power is relatively reduced, wherein the influence of the antenna on low frequency is obvious.

On the other hand, the antenna performance requirements under different application scenes are more and more, and the head-to-hand performance is also met while the free space is compatible; for example, a low-frequency antenna needs to have a good floor longitudinal characteristic model in a free space environment, and the amplitude reduction of a hand model scene in a longitudinal mode is large; if the amplitude reduction of the low-frequency antenna in a hand mode scene is small, the low-frequency antenna has a good floor transverse characteristic mode, and the free space performance of the antenna in a transverse mode is affected, so that the free space and the hand mode need to be designed in a compatible mode. How to design an antenna with better free space performance without changing the screen occupation ratio, and meanwhile, the performance under the free space and hand mode scene is considered, so that more antenna working frequency bands are supported to meet the requirements of customers, and the problem of urgent research and solution is needed.

Disclosure of Invention

The application provides a terminal antenna and electronic equipment, can be under the condition that does not change the screen account for ratio, the performance under balanced free space and the hand model scene promotes the working property of antenna when the low frequency, supports more antenna working frequency channels simultaneously and satisfies customer's demand.

In a first aspect, the application provides a terminal antenna, which is applied to an electronic device and comprises a metal middle frame and a frame;

the metal middle frame is fixedly connected with the frame;

the bezel comprises a first portion, a second portion, and a third portion;

the second part comprises a first frame body and a second frame body, and the first frame body and the second frame body form an L-shaped structure to form one corner of the frame; the first frame body is arranged close to the first part, and the second frame body is arranged close to the third part;

a first gap is arranged between the first part and the second part, and a second gap is arranged between the second part and the third part;

the first part is a first radiator, and the second part is a second radiator; the first radiator is provided with a first grounding point for grounding, and the second radiator is provided with a first feeding point and a second grounding point;

the first portion and the second portion are connected with the metal middle frame through the first grounding point and the second grounding point respectively.

According to the technical scheme provided by the application, the first grounding point is arranged on the first radiator and is directly grounded to form a stronger magnetic field H; a first gap is arranged between the first radiator and the second radiator, and a strong electric field E exists at the position of the first gap; the second grounding point is arranged at the position, close to the second gap, of the second radiator and is grounded through the first switch, the first switch is connected with the 0-ohm resistor, the ground is conducted through the short circuit of the first switch to form a short-circuit condition, and a strong magnetic field H exists, so that the electromagnetic field distribution characteristic in the form of 'HEH' is formed, and the low-frequency band is covered; meanwhile, under the condition of smaller or same clearance environment and radiator structure size, the free space performance and the hand mode performance of the terminal antenna are improved.

Optionally, the first grounding point is directly grounded, the second grounding point is grounded through a first switch, and when the first switch is switched to a short-circuit condition, the first radiator and the second radiator form a slot terminal antenna to cover a low-frequency band.

Optionally, the capacitor is disposed in the first slot in parallel, and is configured to connect the first portion and the second portion.

Optionally, the first feeding point is disposed on the first frame and is close to the first gap to form a side feed; the second grounding point is arranged on the second frame body and is close to the second gap.

Optionally, the first feeding point is disposed on the second frame to form a bottom feed; the second grounding point is arranged on the second frame body, and the second grounding point is arranged close to the second gap.

Optionally, a third ground point is further included;

the third grounding point is arranged in the middle of the second radiator and is grounded through a second switch.

Optionally, the device further comprises a fourth part;

the fourth part is arranged close to the third part, and a third gap is formed between the fourth part and the third part; the third part is a third radiator, and the fourth part is a fourth radiator;

a second feeding point and a fourth grounding point are arranged on the fourth radiator;

the fourth part is connected with the metal middle frame through the fourth grounding point.

Optionally, the second feeding point is disposed near the third slot.

Optionally, a third switch is connected in parallel to the second feeding point and grounded.

Optionally, when the second switch is switched to a short-circuit condition and the first switch is switched to a non-short-circuit condition, the second radiator, the third radiator and the fourth radiator in a portion from the second switch to the second slot form a slot terminal antenna, and the slot terminal antenna covers an intermediate frequency band and a high frequency band.

Optionally, the device further comprises a fourth part;

the fourth part is fixedly connected with the third part, the third part and the fourth part are third radiators, and a second feed point and a fourth grounding point are arranged on the third radiators;

the third part and the fourth part are connected with the metal middle frame through the fourth grounding point.

Optionally, the second feeding point is disposed near the second slot.

Optionally, the third radiator is further provided with a third switch grounded.

In a second aspect, the present application provides an electronic device, where the electronic device includes the terminal antenna described in the first aspect, and the terminal antenna is disposed inside the electronic device.

The technical scheme that this application provided, under less or the same headroom environment and irradiator structure size, through setting up the feed position, the distribution that electric field E and magnetic field H were changed to lower ground position and gap position, the free space performance and the hand mode performance of antenna at the low frequency channel have been promoted, the break-make state through design filter and change switch simultaneously, compromise the low SAR characteristic of high-frequency channel antenna, thereby support more antenna operating frequency channels, form the design of whole full frequency channel.

Drawings

FIG. 1 is a schematic diagram of an embodiment of an antenna structure in a low frequency antenna;

FIG. 2 is a schematic diagram of simulated S-parameters (return loss) and efficiency of an antenna structure in a low frequency antenna;

FIG. 3 is a simulated current distribution plot for an antenna structure in a low frequency antenna at a first resonance;

FIG. 4 is a simulated current distribution plot for one antenna structure in a low frequency antenna at the occurrence of a second resonance;

fig. 5 is a schematic structural diagram of a terminal antenna according to the first embodiment of the present application, which includes a side feed;

fig. 6 is a schematic structural diagram of a first embodiment of a terminal antenna according to the present application, including a bottom feed;

FIG. 7 is a diagram of simulated S-parameters (return loss) and efficiency for a first embodiment of the present application;

FIG. 8 is a simulated current distribution plot for the first embodiment of the present application in the presence of first resonance;

FIG. 9 is a simulated current distribution plot for the first embodiment of the present application in the presence of a second resonance;

FIG. 10 is a graph comparing the performance of the first embodiment of the present application with the above-described embodiments of the antenna structure;

FIG. 11 is a left and right hand phantom simulation model according to a first embodiment of the present application;

FIG. 12 is a diagram illustrating free space performance, left-right hand mode performance and amplitude reduction in the B28 band according to the first embodiment of the present application;

FIG. 13 is a diagram illustrating free space performance, left-right hand mode performance and amplitude reduction in the B5 band according to the first embodiment of the present application;

FIG. 14 is a diagram illustrating free space performance, left-right hand mode performance and amplitude reduction in the B8 band according to the first embodiment of the present application;

fig. 15 is a schematic structural diagram of a terminal antenna according to a second embodiment of the present application;

fig. 16 is a schematic structural diagram of a terminal antenna according to a third embodiment of the present application;

fig. 17 is a schematic structural diagram of a terminal antenna according to a fourth embodiment of the present application;

fig. 18 is a schematic structural diagram of a terminal antenna according to a fifth embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. Other embodiments based on the embodiments of the present application and obtained by a person of ordinary skill in the art without any creative effort belong to the protection scope of the present application.

The terminology used in the following examples is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of this application and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, such as "one or more", unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" means one, two or more. The term "and/or" is used to describe an association relationship that associates objects, meaning that three relationships may exist; for example, a and/or B, may represent: a alone, both A and B, and B alone, where A, B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

The terminal antenna shown in the embodiment of the present application may be applied to an electronic device, where the electronic device includes, but is not limited to, a mobile or fixed terminal having an antenna, such as a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (UMPC), a handheld computer, an intercom, a netbook, a POS machine, a wearable device, a virtual reality device, a wireless usb disk, a bluetooth sound, a bluetooth headset, or a vehicle-mounted front-end device. The embodiment of the present application does not set any limit to this.

For example, the electronic device such as a mobile phone may further include an antenna, a radio frequency module, a communication module, a modem processor, a baseband processor, and the like, so as to implement a wireless communication function of the electronic device.

The antenna is used for transmitting and receiving electromagnetic wave signals. Each antenna in the handset may be used to cover a single or multiple communication bands. Different antennas can also be multiplexed to improve the utilization of the antennas. For example: the antennas may be multiplexed as diversity antennas for a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The radio frequency module can provide a solution including 2G/3G/4G/5G wireless communication applied to a mobile phone. The rf module may include at least one filter, a switch, a power amplifier, a Low Noise Amplifier (LNA), and the like. The radio frequency module can receive electromagnetic waves by the antenna, filter and amplify the received electromagnetic waves and transmit the electromagnetic waves to the modulation and demodulation processor for demodulation. The radio frequency module can also amplify the signal modulated by the modulation and demodulation processor and convert the signal into electromagnetic wave to radiate the electromagnetic wave through the antenna.

The modem processor may include a modulator and a demodulator. The modulator is used for modulating a low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is used for demodulating the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then passes the demodulated low frequency baseband signal to a baseband processor for processing. The low frequency baseband signal is processed by the baseband processor and then transferred to the application processor.

The communication module receives electromagnetic waves through the antenna, frequency-modulates and filters electromagnetic wave signals, and sends the processed signals to the processor. The communication module can also receive a signal to be sent from the processor, frequency-modulate and amplify the signal, and convert the signal into electromagnetic waves through the antenna to radiate the electromagnetic waves.

In some embodiments, an antenna in the handset is coupled to the radio frequency module and the communication module, respectively, so that the handset can communicate with the network and other devices through wireless communication techniques.

Fig. 1 is a schematic diagram of an embodiment of an antenna structure in a low frequency antenna.

As shown in fig. 1, the antenna structure includes a left side frame, a right side frame, and a lower side frame connected together, where the left side frame and the lower side frame are respectively provided with a first gap a and a second gap b, and are sequentially divided into a first radiator, a second radiator, and a third radiator from left to right by the two gaps, a feeding point c is set at a terminal position of the second radiator, an antenna location d is set in a middle of the second radiator, and a switch SW is directly set at the feeding point c and the antenna location d.

When the low-frequency antenna works, through the first gap a arranged on the left side frame and the second gap b arranged on the lower end frame, the positions of the first gap a and the second gap b are both provided with a stronger electric field E and are in a large impedance state, and the middle part between the first gap a and the second gap b is provided with a short circuit to the ground, so that the middle part is provided with a stronger magnetic field H, thereby forming the electromagnetic field distribution characteristic of an EHE form.

Fig. 2 is a schematic diagram of simulated S-parameters (return loss) and efficiency of the antenna structure. Referring to fig. 2, two resonances occur in the antenna structure, and when the resonance is at 0.85GHz, the system efficiency in a free space scenario reaches around-8.6 dB. Fig. 3 is a simulated current distribution diagram of the antenna structure at a first resonance, and fig. 4 is a simulated current distribution diagram of the antenna structure at a second resonance. Referring to fig. 3, it can be seen that the current distribution of the first resonance at the frequency of 0.85GHz exhibits a reverse current distribution characteristic, and the current distribution of the second resonance at the frequency of 1.15GHz exhibits a same-direction current distribution characteristic, referring to fig. 4.

Therefore, in order to optimize the free space performance of the low-frequency antenna structure, the application provides a terminal antenna and an electronic device. According to the method, the terminal antenna with the transverse and longitudinal modes is designed in the electronic equipment, and the gap is formed in the terminal antenna, so that the free space performance and the hand mode performance of the low-frequency terminal antenna can be improved in the low-frequency working frequency band and under the smaller or the same clearance environment and the same structure size of a radiator; meanwhile, more antenna working frequency bands are supported by designing a filter or changing the on-off state of a switch, and the whole LMH full-frequency band terminal antenna is formed.

Fig. 5 is a schematic structural diagram of a terminal antenna according to the first embodiment of the present application, which includes a side feed; and the working frequency band of the terminal antenna is a low-frequency band. As shown in fig. 5, the terminal antenna includes a metal middle frame 1 and a frame; the metal middle frame 1 is fixedly connected with the frame; the frame comprises a first portion 2, a second portion 3 and a third portion 4; the second part 3 comprises a first frame 31 and a second frame 32, the first frame 31 is arranged close to the first part 2, and the second frame 32 is arranged close to the third part 4; a first gap 6 is arranged between the first part 2 and the second part 3, and a second gap 7 is arranged between the second part 3 and the third part 4; the first part 2 is a first radiator, and the second part 3 is a second radiator; the first radiator is provided with a first grounding point 9, and the second radiator is provided with a first feeding point 10 and a second grounding point 11; the first grounding point 9 is directly connected to ground and the second grounding point 11 is connected to ground through a series first switch 12. Specifically, the first switch 12 may be replaced by a filter, that is, changing the on-off state of the first switch 12 and designing the filter may both be implemented; the first and

second portions

2, 3 are connected to the metal bezel 1 via the first grounding point 9, a first feeding point 10 and a second grounding point 11, respectively.

As is apparent from comparison with fig. 1, the terminal antenna provided in this embodiment is completely different from the design of fig. 1 in the distribution of the electric field E and the magnetic field H. The first radiator is provided with the first grounding point 9, and the first grounding point 9 is directly grounded to form a stronger magnetic field H. A first gap 6 is arranged between the first radiator and the second radiator, and a stronger electric field E exists at the position of the first gap 6. The second grounding point 11 is arranged at the position of the second radiator close to the second gap 7 and is grounded in series through the first switch 12, the first switch 12 is connected with a 0 ohm resistor, a short circuit condition is formed by the short circuit conduction of the first switch 12, and a strong magnetic field H exists, so that the electromagnetic field distribution characteristic of an HEH form is formed, and the low-frequency band is covered. It should be noted that, when the first switch 12 is used as a non-short-circuit condition, it can be switched according to actual conditions to implement corresponding functions in different states.

Further, the present application further includes a third grounding point 14, where the third grounding point 14 is disposed in the middle of the second radiator, and the third grounding point 14 is grounded through a second switch 15 connected in series. The first frame 31 is arranged from the first gap 6 to the third grounding point 14; from the third ground point 14 to the second slot 7 to the second frame 32.

The first feeding point 10 is arranged on the first frame 31 and close to the first gap 6 to form side feeding; the second grounding point 11 is arranged on the second frame 32, close to the second slot 7, and the third grounding point 14 is located between the first feeding point 10 and the second grounding point 11. Further, fig. 6 is a schematic structural diagram of the first embodiment of the terminal antenna of the present application, including a bottom feed. As can be seen from the figure, the first feeding point 10 may also be disposed on the second frame 32 to form a bottom feed; the second grounding point 11 is arranged on the second frame 32, the second grounding point 11 is arranged close to the second gap 7, and the first feeding point 10 is located between the third grounding point 14 and the second grounding point 11.

Furthermore, the material of the frame is selectable, and is not limited to a metal frame, for example, a plastic material, i.e., a non-metal frame, may also be selected; either MDA or FPC antennas may be suitable for the bezel.

FIG. 7 is a diagram of simulated S-parameters (return loss) and efficiency for a first embodiment of the present application; as shown in fig. 7, two resonances appear in the low-frequency terminal antenna of the present application, and when the resonance is at 0.85GHz, the system efficiency in a free space scene reaches about-6.60 dB, thereby achieving the improvement of the free space performance. FIG. 8 is a simulated current distribution plot for a first resonance in a first embodiment of the present application; FIG. 9 is a simulated current distribution plot for the first embodiment of the present application at the second resonance; referring to fig. 8 and 9, the selected frequency points of the current distribution are consistent with the selected frequency points of the current distribution in fig. 3 and 4; the current distribution of the low-frequency antenna structure of the present application at 0.85GHz shows a slot co-directional current mode, which is completely different from the current distribution mode shown in fig. 3. Meanwhile, the current distribution at 1.15GHz shows a slot-opposed current mode, which is completely different from the current distribution mode in fig. 5.

Fig. 10 is a graph comparing the performance of the first embodiment of the present application and the antenna structure of the above-mentioned fig. 1 in the low frequency band under the same radiation space and the same radiator; as shown in fig. 10, wherein reference numerals 1-6 denote terminal antennas provided herein, reference numerals 7-12 denote the antenna structures of fig. 1, and the low-frequency terminal antenna of the present application adjusts the frequency point to be the same as that of the antenna structure embodiment of fig. 1, and the S11 resonance depth is also similar to that of the antenna structure embodiment of fig. 1; it can be seen from the figure that the system efficiency of the low-frequency terminal antenna of the present application is improved by about 2dB from the previous-8.60 dB to the present-6.68 dB in the B5 frequency band; in the frequency band of B8, the improvement is about 1.5dB from the previous-7.98 dB to the current-6.45 dB; in the B28 frequency band, the improvement is about 3dB from the previous-10.11 dB to the current-7.20 dB, the improvement of the whole free space performance of the B5 frequency band, the B8 frequency band and the B28 frequency band in the low-frequency band can be realized, and the beneficial effect of the comprehensive broadening of the efficiency and the bandwidth is realized.

Further, aiming at the design of the low-frequency antenna structure of fig. 5, simulation of a hand model is performed at the same time. FIG. 11 is a left and right hand phantom simulation model according to a first embodiment of the present application; FIG. 12 is a diagram illustrating free space performance, left-right hand mode performance and amplitude reduction in the B28 band according to the first embodiment of the present application; as can be seen from the figure, the free space efficiency in the B28 frequency band is-7.20 dB, the left hand mode efficiency is-8.36 dB, the right hand mode efficiency is-14.08 dB, the left hand reduced amplitude is about 1.1dB, and the right hand reduced amplitude is about 6.8 dB.

FIG. 13 is a diagram illustrating free space performance, left-right hand mode performance and amplitude reduction in the B5 band according to the first embodiment of the present application; as can be seen from the figure, the free space efficiency in the B5 frequency band is-6.69 dB, the left hand mode efficiency is-9.36 dB, the right hand mode efficiency is-13.21 dB, the left hand reduced amplitude is about 2.7dB, and the right hand reduced amplitude is about 6.5 dB.

FIG. 14 is a diagram illustrating free space performance, left-right hand mode performance and amplitude reduction in the B8 band according to the first embodiment of the present application; as can be seen from the figure, the free space efficiency in the B8 frequency band is-6.45 dB, the left hand mode efficiency is-10.10 dB, the right hand mode efficiency is-12.24 dB, the left hand reduced amplitude is about 3.5dB, and the right hand reduced amplitude is about 5.8 dB. Therefore, as can be seen from fig. 10 to 13, when the working frequency band of the terminal antenna designed by the present application is low frequency, the free space performance can be improved, and meanwhile, the terminal antenna has a better hand mode performance.

Based on the first embodiment of the terminal antenna of the present application, in order to enhance the coupling strength and reduce the dielectric loss, fig. 15 is a schematic structural diagram of a second embodiment of the terminal antenna of the present application; the structure of the second embodiment further comprises a capacitor 13, and the capacitor 13 is arranged in parallel in the first slot 6 and is used for connecting the first part 2 and the second part 3. Specifically, in order to increase the coupling strength, the pitch of the first slots 6 may be changed, and the pitch of the first slots 6 may be decreased, but the electric field E may be increased while the pitch is decreased, so that the current strength is increased, and the dielectric loss may be increased, and the energy loss may be increased, thereby finally decreasing the antenna efficiency.

In order to avoid the above situation, and satisfy the requirements of coupling strength and dielectric loss simultaneously, the distance between the first slots 6 is increased, the coupling strength is reduced, the dielectric loss is reduced, the capacitor 13 is connected in parallel with the first slots 6, the total capacitance value is increased, and the coupling strength is improved, further, because the dielectric loss of the capacitor 13 is smaller, and the total dielectric loss after being connected in parallel is smaller, the dielectric loss is reduced under the condition of satisfying the coupling strength, and the antenna performance can be further improved.

In order to form the antenna design of the LMH full frequency band, the MHB antenna is formed by structural design on the basis of the low-frequency antenna of the first embodiment. Fig. 16 is a schematic structural diagram of a terminal antenna according to a third embodiment of the present application. As can be seen from the figure, the structure according to the first embodiment further includes a fourth portion 5, and the fourth portion 5 is disposed near the third portion 4, and a third gap 8 is disposed between the fourth portion 5 and the third portion 4. The third part 4 is a third radiator, and the fourth part 5 is a fourth radiator; a second feeding point 16 and a fourth grounding point 17 are arranged on the fourth radiator; the fourth section 5 is connected to the metal bezel 1 via the second feeding point 16 and a fourth grounding point 17. The second feeding point 16 is arranged close to the third slot 8. The second feeding point 16 is connected to ground via a shunt third switch 18.

Specifically, when the terminal antenna of the present application meets the requirements of the working of the intermediate frequency and the high frequency working frequency bands, the working principle is as follows: by providing the fourth radiator with a second feeding point 16 and a fourth grounding point 17, the fourth grounding point 17 is directly grounded to form a stronger magnetic field H; a strong electric field E is present at the location of the third slot 8 close to the second feeding point 16. The first switch 12 no longer serves as a short-circuit condition of the low-frequency antenna in the first embodiment, but performs component switching according to the requirement of the MHB antenna to serve as a tuning function; specifically, the first switch 12 cooperates with the second switch 15 to perform radiator tuning. The second switch 15 is then switched to form a short-circuit boundary condition, for example with a resistance of 0 ohm or a small inductance, and a strong magnetic field H is present, thus forming an electromagnetic field distribution characteristic in the form of "HEH". Thus, the overall radiation pattern from the position below ground of the fourth ground point 17 to the position of the second switch 15 is formed, covering the whole range of the mid and high frequency bands, thus achieving better free space performance, head-hand mode performance and low SAR performance of the MHB antenna.

It should be noted that the radiator in the low-frequency antenna in the first embodiment again serves as a partial radiator of the MHB antenna. As can be seen from area 1 in fig. 16, the radiator in the low frequency antenna includes a first radiator and a second radiator; as can be seen from area 2 in fig. 16, the radiator of the MHB antenna includes a third radiator, a fourth radiator, and a portion of the second radiator from the position of the first switch 12 to the position of the second switch 15. In the embodiment of the present application, by providing the third slot 8 and the fourth portion 5, an antenna covering a medium-high frequency band can be implemented; meanwhile, the degree of freedom of the design of the antenna is higher through the switching of the first switch 12 and the second switch 15, and the number of frequency bands capable of being covered is increased, so that the design of the whole LMH full-frequency-band antenna is formed.

Based on the second embodiment and the third embodiment, in order to improve the performance of the LMH full-band antenna, a fourth embodiment is further provided in the present application, referring to fig. 17, where fig. 17 is a schematic structural diagram of the fourth embodiment of the terminal antenna in the present application; a capacitor 13 is arranged in parallel at the first slot 6, said capacitor 13 being used to connect the first part 2 and the second part 3. When the working frequency band of the antenna is low frequency, the capacitor 13 is connected in parallel, so that the coupling strength can be enhanced, the dielectric loss can be reduced, and the performance of the antenna in the low frequency band can be further improved.

In addition to the third embodiment of the present application, a fifth embodiment shown in fig. 18 can be obtained by modifying the structure design. Fig. 18 is a schematic structural diagram of a terminal antenna according to a fifth embodiment of the present application. The feeding position of the MHB antenna is changed, the fourth part 5 is fixedly connected with the third part 4, no gap is arranged between the third part 4 and the fourth part 5, the third part 4 and the fourth part 5 are third radiators, and the third radiators are provided with a second feeding point 16, a fourth grounding point 17 and a third switch 18; the second feeding point 16 is arranged close to the second slot 7 and the third switch 18 is located between the second feeding point 16 and a fourth grounding point 17; therefore, when the second switch 15 is switched to the short-circuit condition, the first switch 12 cooperates with the second switch 15 to perform radiator tuning, and the second switch 15 to the second slot 7 and the third radiator in the second radiator form a slot termination antenna covering the medium-frequency and high-frequency bands. The radiator of the low-frequency antenna is unchanged, so that the LMH full-band antenna design is formed.

It should be noted that the terminal antenna provided in the present application changes the distribution of the electric field E and the magnetic field H by changing the feeding position, the down-ground position, and the slot position, thereby implementing different operating modes of the antenna. The terminal antenna of the present application may be disposed at a top corner or a bottom corner of an electronic device, for example, the first portion 2 is a side frame of the electronic device, the third portion 4 is a bottom frame of the electronic device, and the second portion 3 includes a part of the side frame and a part of the bottom frame; the first portion 2 may be a bottom frame of the electronic device, the third portion 4 may be a side frame of the electronic device, and the second portion 3 may include a part of the side frame and a part of the bottom frame; the method is not limited at all, and can be set according to the actual situation; for example, when disposed at the bottom corner, the metal middle frame 1 is provided with a SIM card slot 19, a USB port 20 and a speaker 21, and the SIM card slot 19 is located between the second feeding point 16 and the fourth ground point 17. The USB port 20 corresponds in position to the third portion 4. The loudspeaker 21 corresponds in position to the second part 3.

Further, the present application may further include at least one matching circuit, one end of the matching circuit is connected to the first switch 12, the second switch 15, and the third switch 18, and the other end of the matching circuit is connected to the radiator. The specific structures of the first switch 12, the second switch 15, the third switch 18, and the matching circuit are not limited. For example, the first switch 12, the second switch 15, and the third switch 18 may be a single-pole multi-throw switch with one input and multiple outputs, or may be a multi-pole multi-throw switch with multiple inputs and multiple outputs, which is not limited in the present application. The switch is used for adjusting the frequency range covered by the terminal antenna provided by the application (by adjusting the antenna transmission coefficient, impedance and the like).

The matching circuit may include various structures capable of impedance matching, such as an impedance transformation line or a lumped element network. For example, a capacitor, an inductor, a plurality of capacitors connected in series, a plurality of inductors connected in series, a plurality of capacitors connected in parallel, a plurality of inductors connected in parallel, at least one capacitor and at least one inductor connected in series, or at least one group of capacitors and inductors connected in series and connected in parallel may be used, which is not limited in this application. Specifically, the input impedance in the terminal antenna can be adjusted by changing the line width of the impedance transformation line and changing the electrical characteristic parameters (such as capacitance value, inductance value and the like) of the components in the lumped element network, so as to realize impedance matching.

It should be noted that, in all the embodiments described above, the second radiator, the third radiator and the fourth radiator all extend along the first radiator, and the first radiator, the second radiator, the third radiator and the fourth radiator may have a structure with a main extending direction, such as a straight line shape, a curved line shape, an arc shape, a wave shape, and the like, which is specifically adjusted according to actual situations.

The embodiment of the application further provides an electronic device, which includes a housing, a terminal antenna, a radio frequency module, a communication module, and a modem processor, where the terminal antenna, the radio frequency module, the communication module, and the modem processor are disposed inside the housing, and the terminal antenna is the terminal antenna shown in the above embodiment.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A terminal antenna is applied to electronic equipment and is characterized by comprising a metal middle frame (1) and a frame;

the metal middle frame (1) is fixedly connected with the frame;

the frame comprises a first portion (2), a second portion (3) and a third portion (4);

the second part (3) comprises a first frame body (31) and a second frame body (32), wherein the first frame body (31) and the second frame body (32) form an L-shaped structure and form one corner of the frame; the first frame (31) is arranged close to the first part (2), and the second frame (32) is arranged close to the third part (4);

a first gap (6) is arranged between the first part (2) and the second part (3), and a second gap (7) is arranged between the second part (3) and the third part (4);

the first part (2) is a first radiator, and the second part (3) is a second radiator; the first radiator is provided with a first grounding point (9) for grounding, and the second radiator is provided with a first feeding point (10) and a second grounding point (11);

the first portion (2) and the second portion (3) are connected to the metal middle frame (1) by means of the first grounding point (9) and a second grounding point (11), respectively.

2. A terminal antenna according to claim 1, characterised in that said first grounding point (9) is directly grounded and said second grounding point (11) is grounded via a first switch (12), said first radiator and said second radiator constituting a slot terminal antenna covering a low frequency band when said first switch (12) is switched to a short circuit condition.

3. A terminal antenna according to claim 2, characterized in that it further comprises a capacitor (13), said capacitor (13) being arranged in parallel in said first slot (6) for connecting said first part (2) and said second part (3).

4. A terminal antenna according to claim 3, characterized in that said first feeding point (10) is arranged on said first frame (31) and close to said first slot (6) to form a side feed; the second grounding point (11) is arranged on the second frame body (32) and is close to the second gap (7).

5. A terminal antenna according to claim 3, characterized in that said first feeding point (10) is arranged on said second frame (32) forming a bottom feed; the second grounding point (11) is arranged on the second frame body (32), and the second grounding point (11) is arranged close to the second gap (7).

6. A terminal antenna according to claim 4 or 5, characterised by a third grounding point (14);

the third grounding point (14) is arranged in the middle of the second radiator, and the third grounding point (14) is grounded through a second switch (15).

7. A terminal antenna according to claim 6, characterised in that it further comprises a fourth part (5);

the fourth part (5) is arranged close to the third part (4), and a third gap (8) is arranged between the fourth part and the third part (4); the third part (4) is a third radiator, and the fourth part (5) is a fourth radiator;

a second feeding point (16) and a fourth grounding point (17) are arranged on the fourth radiator;

the fourth portion (5) is connected to the metal middle frame (1) via the fourth grounding point (17).

8. A terminal antenna according to claim 7, characterised in that said second feeding point (16) is arranged close to said third slot (8).

9. A terminal antenna according to claim 8, characterised in that the second feeding point (16) is provided in parallel with a third switch (18) to ground.

10. A terminal antenna according to claim 9, characterized in that when the second switch (15) is switched to the short-circuit condition and the first switch (12) is switched to the non-short-circuit condition, the second radiator, together with the third radiator and the fourth radiator, of the second switch (15) to the second slot (7) forms a slot terminal antenna covering medium and high frequency bands.

11. A terminal antenna according to claim 6, characterised in that it further comprises a fourth part (5);

the fourth part (5) is fixedly connected with the third part (4), the third part (4) and the fourth part (5) are third radiating bodies, and a second feeding point (16) and a fourth grounding point (17) are arranged on each third radiating body;

the third part (4) and the fourth part (5) are connected with the metal middle frame (1) through the fourth grounding point (17).

12. A terminal antenna according to claim 11, characterised in that said second feeding point (16) is arranged close to said second slot (7).

13. A terminal antenna according to claim 12, characterized in that the third radiator is further provided with a third switch (18) to ground.

14. A terminal antenna according to claim 13, characterized in that when the second switch (15) is switched to the short-circuit condition and the first switch (12) is switched to the non-short-circuit condition, the second radiator, together with the third radiator and the fourth radiator, of the second switch (15) to the second slot (7) forms a slot terminal antenna covering medium and high frequency bands.

15. An electronic device, characterized in that it comprises a terminal antenna according to any of claims 1-14, said terminal antenna being arranged inside said electronic device.