CN212908059U - Metal middle frame and electronic equipment - Google Patents

Abstract

The utility model provides a metal center and electronic equipment, set up at least a set of gap on the metal center, every group the gap includes at least one line of slits, just the one end of line of slits extends to the frame department of metal center, the other end orientation of line of slits the opposite side frame of metal center extends, the gap be used for with the gap antenna is separated into to the metal center. The utility model provides a metal center and electronic equipment can promote throughput and the radiation ability of antenna by a wide margin.

Description

Metal middle frame and electronic equipment

Technical Field

The utility model relates to a mobile communication field especially relates to a metal center and electronic equipment.

Background

Along with the continuous development of communication technology, Long Term Evolution (LET) communication has been popularized all over the world, meanwhile, Sub6G, 5G SA and millimeter wave communication technologies have been exposed in our lives, and the greatest advantages of Sub6G, 5G SA and millimeter wave and LTE communication are embodied in the enhancement of mobile broadband, the internet of things with large data and large connection and the communication with ultrahigh reliability and ultralow delay, so that the great change of the number cannot be greatly improved, and as a mobile terminal, a carrier on which throughput depends is an antenna which is a converter of high-frequency electric signals and radio-magnetic waves, and high-frequency current can be converted into radio-magnetic waves to be radiated to a distance, and information carried in the radio-magnetic waves is transmitted to the distance. Meanwhile, the antenna can also convert electromagnetic wave signals transmitted in space into high-frequency current signals, acquire information carried in the electromagnetic waves and realize wireless communication, so that the antenna is a converter between the high-frequency current and the radio electromagnetic waves and is an integral part of throughput in communication.

At present, along with the gradual improvement of quality of life, people have higher and higher requirements on the appearance of the mobile terminal, the limit requirements of screen occupation ratio, the gradual increase of cameras, the continuous improvement of various communication modules and the like, the space which can be exerted by the antenna is smaller and smaller, the requirements on the performance of the antenna are continuously improved, and therefore how to solve the technical problems that the throughput of the mobile terminal is small, the efficiency is low and the like are urgently needed to be solved in the industry.

SUMMERY OF THE UTILITY MODEL

The utility model provides a metal center and electronic equipment for solve the technical problem that throughput is little, inefficiency that current mobile terminal exists at least.

In order to achieve the above object, an aspect of the present invention provides a metal middle frame, set up at least a set of gap on the metal middle frame, every group the gap includes at least one slot seam, just the one end of slot seam extends to the frame department of metal middle frame, the other end orientation of slot seam the opposite side frame of metal middle frame extends, the gap be used for with the metal middle frame is separated into the gap antenna.

In a possible embodiment, each set of slits includes a first slit and a second slit parallel to the first slit, and the first slit and the second slit are staggered on the metal middle frame.

In one possible embodiment, the spacing between the first slot and the second slot is between 30 ± 0.05 mm.

The length of the slot is between 60 mm and 0.05 mm.

The width of the slot is 1-2 mm.

Optionally, the slot is filled with plastic.

Optionally, the inner wall of the slot is serrated.

The utility model provides a metal center, through having seted up at least a set of gap, every group gap includes an at least line of seam, and the one end of line of seam extends to the frame department of metal center, and the other end extends towards the opposite side frame of metal center, and the gap separates into the slot antenna with the metal center, and the slot antenna can change the position at antenna current zero point to reach the purpose that changes the antenna directivity, promote the throughput and the radiation ability of antenna by a wide margin.

The utility model discloses another aspect provides an electronic equipment, include: the display screen comprises a display screen, a rear cover, the metal middle frame, a substrate and a battery, wherein the metal middle frame is positioned between the display screen and the rear cover.

The substrate is located between the display screen and the metal middle frame, a metal radiating body is arranged on one surface of the substrate facing the display screen, the metal radiating body is electrically connected with a signal source through a first feeding point, and the slot antenna is electrically connected with the signal source through a second feeding point.

The battery is located the metal center with between the back lid, just set up the multiunit on the metal center with the region that the battery is relative the gap.

Optionally, a ground layer is disposed on a surface of the substrate facing the metal middle frame, and the ground layer is electrically connected to the metal middle frame through an electrical connector.

Optionally, a microstrip line is disposed on a surface of the substrate facing the display screen, and the first feeding point and the second feeding point are electrically connected to the signal source through the microstrip line.

And the distance between the microstrip line and the central line of the substrate is between 41 plus or minus 0.05 mm.

In one possible implementation, the electronic device further includes: the first elastic sheet is electrically connected with the first feed point, and the other end of the first elastic sheet abuts against the metal radiating body.

The second elastic sheet is electrically connected with the second feeding point, and the other end of the second elastic sheet abuts against the metal middle frame.

Optionally, the first elastic piece and the first feeding point are arranged at an interval, and a connecting line between the first elastic piece and the first feeding point is parallel to the extending direction of the slot.

The second elastic sheet and the second feeding point are arranged at intervals, and a connecting line between the second elastic sheet and the second feeding point is parallel to the extending direction of the slot.

The utility model provides an electronic equipment, which comprises a display screen, a substrate, metal center and hou gai, wherein, the base plate is located between display screen and the metal center, the one side that the base plate is towards the display screen is equipped with the metal irradiator, the metal irradiator passes through the feed point and is connected with the signal source electricity on the base plate, form a signal return circuit, with this effect that reaches signalling and receiving, at least a set of gap has been seted up on the metal center, every group gap includes an at least line slot, the one end of line slot extends to the frame department of metal center, the other end extends towards the opposite side frame of metal center, the gap separates into the gap antenna with the metal center, the position that the antenna current zero point can be changed to the gap antenna, thereby reach the mesh that changes the antenna directivity, promote the throughput and the radiation capacity of.

In addition to the technical problems, technical features constituting technical solutions, and advantageous effects brought by the technical features of the technical solutions described above, other technical problems, technical features included in technical solutions, and advantageous effects brought by the technical features that can be solved by the electronic device provided by the embodiments of the present invention will be described in further detail in the detailed description of the embodiments.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a metal middle frame of an electronic device according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structure diagram of an electronic device according to an embodiment of the present invention.

Description of reference numerals:

100-a display screen;

200-rear cover;

300-metal middle frame;

310-a gap;

311-a first slot;

312-a second slot;

400-a substrate;

500-a metal radiator;

600-a first feeding point;

700-a second feeding point;

800-a first spring plate;

810-a second spring plate;

900-a battery;

1000-ground plane.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Smart phones have become devices that people cannot lack in life, work, or even study today. Due to the portability and the diversity of functions of the smart phone, the smart phone does not have any equipment to replace. A smart phone is a wireless device and an antenna is one of the necessary devices in a smart phone, and no matter how far developed, an antenna cannot be cancelled from the phone. Through the development of years, the smart phone has the 1G communication equipment of the first generation and has developed to the current 5G era, which has no great change for the life of people, so that people can browse videos and live broadcast in any time and any place, know the latest information and current affairs around the world, have no low delay, and the ultra-bandwidth is data communication, and the method for realizing the communication technology is the improvement of the throughput.

With the gradual increase of people's life, and the demand of material is gradually increased and is constantly abundant to the art, also the requirement to the outward appearance of cell-phone is higher and higher, for example: the limit requirement of screen ratio, the gradual increase of cameras and the continuous promotion of communication module, the continuous abundance of structure technology, the subjective test of reliability leaves the space that can exert for the antenna more and more little, but nevertheless to the continuous promotion of the demand of antenna performance, this is not huge challenge.

However, there are many methods for improving the performance of the antenna, and a method for improving the throughput is not common, so that the antenna is not deeply understood and intensely discussed, and new things are not explored, and the conventional technology can be broken through, so that the problem in a certain field is continuously solved, and the living requirements of people are met.

In view of the above background, the utility model provides an electronic equipment, which comprises a display screen, a substrate, metal center and hou gai, wherein, the base plate is located between display screen and the metal center, the one side of base plate orientation display screen is equipped with the metal radiating body, the metal radiating body passes through the feed point and is connected with the signal source electricity on the base plate, form a signal return circuit, with this effect that reaches signal transmission and receipt, at least a set of gap has been seted up on the metal center, every group gap includes an at least line slot, the one end of line slot extends to the frame department of metal center, the other end extends towards the opposite side frame of metal center, the gap separates into the gap antenna with the metal center, the position at antenna current zero point can be changed to the gap antenna, thereby reach the mesh that changes the antenna directivity, promote the throughput and the radiation ability of.

Example one

Fig. 1 is a schematic structural diagram of a metal middle frame of an electronic device provided by an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a cross section of an electronic device provided by an embodiment of the present invention.

Referring to fig. 1 and 2, an embodiment of the present invention provides an electronic device including a display screen 100, a rear cover 200, and a metal middle frame 300 between the display screen 100 and the rear cover 200.

The metal middle frame 300 is filled with plastic, wrapped and combined with the rear cover 200 to form a housing and form an accommodating space, and the accommodating space is used for accommodating devices such as a substrate, a display screen and a battery.

In some embodiments, the housing may be a metal housing, such as a metal of magnesium alloy, stainless steel, and the like. It should be noted that, the material of the housing in the embodiment of the present application is not limited to this, and other manners may also be adopted, such as: the housing may be a plastic housing. Also for example: the shell is a ceramic shell. For another example: the housing may include a plastic part and a metal part, and the housing may be a housing structure in which metal and plastic are matched, specifically, the metal part may be formed first, for example, a magnesium alloy substrate is formed by injection molding, and then plastic is injected on the magnesium alloy substrate to form a plastic substrate, so as to form a complete housing structure.

At least one group of slots 310 are formed in the metal middle frame 300, each group of slots 310 includes at least one slot, one end of each slot extends to the frame of the metal middle frame 300, the other end of each slot extends towards the other side frame of the metal middle frame 300, and the slots 310 are used for separating the metal middle frame 300 into slot antennas.

Specifically, one end of the slot is slotted to the edge of the frame of the metal middle frame 300, the other end of the slot extends towards the frame on the other side of the metal middle frame 300, the other end of the slot is not slotted to the edge of the frame of the metal middle frame 300 any more, the slot divides the metal middle frame 300 into slot antennas, and the slot antennas can change the position of the current zero point of the antennas, so that the purpose of changing the directivity of the antennas is achieved, and the throughput and the radiation capability of the antennas are greatly improved.

The embodiment of the utility model provides an electronic equipment still includes base plate 400, and base plate 400 is located between display screen 100 and the metal center 300, and base plate 400 is equipped with metal radiator 500 towards the one side of display screen 100, and metal radiator 500 passes through first feed point 600 and slot antenna and passes through second feed point 700 and be connected with the signal source electricity.

Specifically, the signal source is connected to the substrate 400, the metal radiator 500 is electrically connected to the signal source through the first feeding point 600, and the slot antenna is electrically connected to the signal source through the second feeding point 700, so as to form a signal loop, thereby achieving the functions of signal transmission and signal reception.

It should be noted that, the embodiment of the utility model provides an electronic equipment, metal center 300 has effectively utilized metal center 300, metal center 300 can directly be used as the irradiator, as the carrier of receipt and radiation signal, the slot seam is separated into slot antenna with metal center 300, slot antenna can change the position at antenna current zero point, thereby reach the purpose that changes the antenna directivity, the throughput and the radiation ability of antenna promote by a wide margin, and electronic equipment antenna compact structure, and is simple and reliable, occupation space is little, low in production cost, stable performance, the mass production of being convenient for.

In some embodiments of the present invention, the length of the substrate 400 is 155 ± 1% mm, the width is 80 ± 1% mm, the height is 1.6 ± 1% mm, the material of the substrate 400 adopts FR4 material with dielectric constant of 4.4 ± 5%, the lower surface of the substrate 400 is completely covered with metallic copper, the thickness of the copper layer is 35 ± 1% um, the surface of the copper layer can not have scratches, sand holes and wrinkles, the purity of the metallic copper can not be lower than 99.8%, of course, the material selection and configuration of the substrate 400 are not limited to the above description, and herein, there is no limitation.

It should be noted that FR4 refers to a code of a flame-retardant material grade, and means a material specification that resin materials must be self-extinguished after burning, which is not a material name but a material grade, so FR4 grade materials used for general circuit boards are very various, but most are composite materials made of so-called four-function epoxy resin, filler and glass fiber.

FR4 with a dielectric constant of 4.4 +/-5% is adopted as the substrate 400, and is used as the most common board in a printed circuit board, so that the price is low, the purchase is easy, and the manufacturing cost can be reduced.

It should be noted that the electronic device may further include a front camera, a rear camera, a motor USB interface, an earphone interface, a fingerprint unlocking module, an LED lighting device, and the like, and avoidance ports are correspondingly formed in the metal middle frame 300 and the rear cover 200, for example, an LED lighting device window, a camera lens window, a fingerprint identification hole window, and the like, where the window may be in a circular shape, a rectangular shape, a triangular shape, an elliptical shape, and other irregular shapes, and the avoidance ports formed in the metal middle frame 300 may also be regarded as a slot antenna, so as to improve throughput and radiation capability of the antenna. Of course, other components included in the electronic device are not limited to the above, and the positions and shapes of the avoidance openings correspondingly formed on the metal middle frame 300 and the rear cover 200 are not limited herein.

The embodiment of the utility model provides an among the electronic equipment, slot antenna can change the position of antenna current zero point to reach the purpose that changes the antenna directivity, promote the throughput and the radiation ability of antenna by a wide margin, and preparation simple process, easily processing and mass production have great practical application and worth.

In some embodiments provided by the present invention, each group of slits 310 includes a first slit 311 and a second slit 312 parallel to the first slit 311, and the first slit 311 and the second slit 312 are staggered on the metal middle frame 300.

The first slots 311 and the second slots 312 are arranged on the metal middle frame 300 in a staggered mode, a plurality of S-shaped loops can be formed on the metal middle frame 300, the metal middle frame 300 is in multi-point contact with the substrate 400 to form a whole, when the antenna works, the throughput can be improved on a plurality of frequency points lower than 3GHz, and particularly, good improving effects can be achieved on working frequency points of 600MHz to 1GHz of communication.

It should be noted that the "S" shaped loop formed by the first slot 311 and the second slot 312 does not limit the number thereof.

In some embodiments of the present invention, the electronic device further includes a battery 900, the battery 900 is located between the metal middle frame 300 and the rear cover 200, and the plurality of groups of slits 310 are disposed on a region of the metal middle frame 300 opposite to the battery 900.

It is easily understood that when the plurality of sets of slits 310 are disposed on the region of the metal middle frame 300 opposite to the battery 900, when the battery 900 is used excessively, the heat generated by the battery 900 can be dissipated through the slits 310, thereby preventing the electronic components from being damaged when the heat is not dissipated in time.

Optionally, a ground layer 1000 is disposed on a surface of the substrate 400 facing the metal middle frame 300, and the ground layer 1000 is electrically connected to the metal middle frame 300 through a conductive connector.

Specifically, in one possible implementation example, a metal layer having the same size as that of the substrate 400 is provided as the ground layer 1000 on a surface of the substrate 400 facing the metal middle frame 300, the ground layer 1000 is electrically connected to the metal middle frame 300, and the metal middle frame 300 is grounded through the ground layer 1000.

The thickness of the ground plate 1000 is extremely small, the thickness is between 34 and 36 micrometers, the thickness is hardly increased, the ground plate 1000 can be made of copper, and the material of the ground plate 1000 is not limited herein.

In some embodiments, a microstrip line is disposed on a surface of the substrate 400 facing the display screen 100, and the first feeding point 600 and the second feeding point 700 are electrically connected to the signal source through the microstrip line.

Specifically, in some possible embodiments, a microstrip line is printed on a side of the substrate 400 facing the display screen 100, a distance between the microstrip line and a center line of the substrate 400 is 41 ± 0.05mm, and the microstrip line is used for feeding the whole antenna system.

Here, it should be explained that the microstrip line is a microwave transmission line constituted by a single conductor strip supported on a substrate. The planar structure transmission line is suitable for manufacturing microwave integrated circuits. Compared with a metal waveguide, the waveguide has the advantages of small volume, light weight, wide use frequency band, high reliability, low manufacturing cost and the like.

Optionally, the embodiment of the utility model provides an electronic equipment still includes: the first elastic sheet 800 is electrically connected to the first feeding point 600, the other end of the first elastic sheet 800 abuts against the metal radiator 500, the second elastic sheet 810 is electrically connected to the second feeding point 700, and the other end of the second elastic sheet 810 abuts against the metal middle frame 300, so as to form a loop.

In some embodiments of the present invention, the first elastic sheet 800 is spaced from the first feeding point 600, and the second elastic sheet 810 is spaced from the second feeding point 700, so as to further enhance the throughput and radiation capability of the antenna, the connection line between the first elastic sheet 800 and the first feeding point 600 is parallel to the slot, and the connection line between the second elastic sheet 800 and the second feeding point 700 is parallel to the slot.

The utility model provides an among the electronic equipment, the interval between first slot joint 311 and second slot joint 312 is between 30 + -0.05 mm, and the length of slot joint is between 60 + -0.05 mm, and the slot joint width is 1-2 mm. Of course, the interval between the first slot 311 and the second slot 312, the length of the slot, and the width of the slot are all set according to actual requirements, and the interval between the first slot 311 and the second slot 312, the length of the slot, and the width of the slot are not limited at all.

In order to enhance the reliability test of the whole machine, such as the test of dropping, rolling, etc., in some embodiments of the present invention, the slot can be filled with plastic.

Furthermore, in order to enhance the drawing force of the plastic and avoid the shrinking effect of the plastic, the sawtooth operation can be performed on the slot to make the inner wall of the slot in a sawtooth shape, so as to prevent the plastic from breaking due to the influence of external force.

The utility model provides an electronic equipment, which comprises a display screen, a substrate, metal center and hou gai, wherein, the base plate is located between display screen and the metal center, the one side that the base plate is towards the display screen is equipped with the metal irradiator, the metal irradiator passes through the feed point and is connected with the signal source electricity on the base plate, form a signal return circuit, with this effect that reaches signalling and receiving, at least a set of gap has been seted up on the metal center, every group gap includes an at least line slot, the one end of line slot extends to the frame department of metal center, the other end extends towards the opposite side frame of metal center, the gap separates into the gap antenna with the metal center, the position that the antenna current zero point can be changed to the gap antenna, thereby reach the mesh that changes the antenna directivity, promote the throughput and the radiation capacity of.

Example two

The embodiment of the utility model provides a metal center 300 sets up at least a set of gap 310 on the metal center 300, and every group gap 310 includes at least one slot seam, and the one end of slot seam extends to the frame department of metal center 300, and the other end of slot seam extends towards the opposite side frame of metal center 300, and gap 310 is used for separating into the gap antenna with metal center 300.

Each set of slits 310 includes a first slit 311 and a second slit 312 parallel to the first slit 311, and the first slit 311 and the second slit 312 are staggered on the metal middle frame 300.

The spacing between the first slot 311 and the second slot 312 is between 30 + -0.05 mm, the length of the slot is between 60 + -0.05 mm, and the width of the slot is 1-2 mm.

Optionally, the slot is filled with plastic, and the inner wall of the slot is serrated.

The metal middle frame provided in this embodiment is the same as that described in the first embodiment, and is not described in detail here.

The utility model provides a metal center, through having seted up at least a set of gap on the metal center, every group gap includes an at least line of seam, and the one end of line of seam extends to the frame department of metal center, and the other end extends towards the opposite side frame of metal center, and the gap separates into the gap antenna with the metal center, and the gap antenna can change the position at antenna current zero point to reach the purpose that changes the antenna directivity, promote the throughput and the radiation ability of antenna by a wide margin.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", and the like, which are used to indicate the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, and do not indicate or imply that the position or element referred to must have a particular orientation, be of particular construction and operation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; either directly or indirectly through intervening media, such as through internal communication or through an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. The metal middle frame is characterized in that at least one group of gaps are formed in the metal middle frame, each group of gaps comprises at least one slot, one end of each slot extends to the frame of the metal middle frame, the other end of each slot extends towards the other side frame of the metal middle frame, and the gaps are used for separating the metal middle frame into slot antennas.

2. The metal middle frame according to claim 1, wherein each set of the slits includes a first slit and a second slit parallel to the first slit, and the first slit and the second slit are staggered on the metal middle frame.

3. The metal middle frame according to claim 2, wherein a spacing between the first slot and the second slot is between 30 ± 0.05 mm;

the length of the slot is 60 +/-0.05 mm;

the width of the slot is 1-2 mm.

4. The metal middle frame according to any one of claims 1 to 3, wherein the slots are filled with plastic.

5. The metal middle frame according to any one of claims 1 to 3, wherein the inner walls of the slots are serrated.

6. An electronic device, comprising: a display screen, a back cover, the metal middle frame of any one of claims 1-5 positioned between the display screen and the back cover, a substrate, and a battery;

the substrate is positioned between the display screen and the metal middle frame, one surface of the substrate facing the display screen is provided with a metal radiating body, the metal radiating body is electrically connected with a signal source through a first feeding point, and the slot antenna is electrically connected with the signal source through a second feeding point;

the battery is located the metal center with between the back lid, just set up the multiunit on the metal center with the region that the battery is relative the gap.

7. The electronic device of claim 6, wherein a ground layer is disposed on a surface of the substrate facing the metal middle frame, and the ground layer is electrically connected to the metal middle frame through a conductive connector.

8. The electronic device according to claim 6 or 7, wherein a microstrip line is disposed on a surface of the substrate facing the display screen, and the first feeding point and the second feeding point are electrically connected to the signal source through the microstrip line;

and the distance between the microstrip line and the central line of the substrate is between 41 plus or minus 0.05 mm.

9. The electronic device of claim 6 or 7, further comprising: the first elastic sheet is electrically connected with the first feed point, and the other end of the first elastic sheet abuts against the metal radiating body;

the second elastic sheet is electrically connected with the second feeding point, and the other end of the second elastic sheet abuts against the metal middle frame.

10. The electronic device according to claim 9, wherein the first resilient piece is disposed at an interval from the first feeding point, and a connection line between the first resilient piece and the first feeding point is parallel to an extending direction of the slot;

the second elastic sheet and the second feeding point are arranged at intervals, and a connecting line between the second elastic sheet and the second feeding point is parallel to the extending direction of the slot.

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