WO2018058724A1

WO2018058724A1 - Metal rear cover and mobile terminal

Info

Publication number: WO2018058724A1
Application number: PCT/CN2016/103871
Authority: WO
Inventors: 叶扬韬; 王吉钊; 罗振宇
Original assignee: 宇龙计算机通信科技(深圳)有限公司
Priority date: 2016-09-29
Filing date: 2016-10-29
Publication date: 2018-04-05
Also published as: CN106450773A

Abstract

Published is a metal rear cover. The metal rear cover comprises a housing surface and a metal outer frame connected to an edge of the housing surface. The metal outer frame comprises a radiation belt. The radiation belt is connected to the housing surface via an insulation tape. Two ends of the radiation belt are respectively provided with a first feed point and a second feed point. The metal rear cover further comprises an electric conductor. The electric conductor is located between the first feed point and the second feed point and is electrically connected to the radiation belt and the housing surface. Further published is a mobile terminal. The radiation belt of the metal rear cover is used as a common radiation body of a WBG antenna and an upper main antenna, and the housing surface is taken as a reference ground, so that the communication requirements of the WBG antenna and the upper main antenna can be satisfied at the same time where the metal routing is relatively short and the inner space of a mobile phone is small.

Description

Metal back cover and mobile terminal

The present application claims priority to Chinese Patent Application No. 201610872652.3, entitled "Metal Back Cover and Mobile Terminal", filed on September 29, 2016, the entire disclosure of which is incorporated herein by reference.

Technical field

The present invention relates to the field of antenna technologies, and in particular, to a metal back cover and a mobile terminal.

Background technique

With the increasing use of mobile terminals such as smart phones, the requirements for antennas in mobile terminals are becoming more and more strict. The antennas of mobile terminals must not only ensure good function of transmitting and receiving signals, but also reflect the overall structure of mobile terminals. Simple and beautiful features. How to improve the overall aesthetic characteristics of mobile terminals and meet the good transmission and reception capabilities of mobile terminals for multiple signals is a problem that major mobile terminal manufacturers strive to break through.

In the prior art, in order to ensure the normal transmission and reception of signals by the mobile terminal, the metal back cover of the mobile terminal generally adopts a three-stage structure to divide the surface of the metal back cover into three pieces, and the insulating tape separating the three metal areas is a straight line. The structure and the uniform shape design make consumers feel tired and unable to attract consumers to buy. If other shapes are used, the metal back cover can not meet the WBG antenna (WIFI, Bluetooth and GPS) and the owner in the small mobile phone interior space. The communication needs of the antenna.

Summary of the invention

The technical problem to be solved by the present invention is to provide a metal back cover and a mobile terminal for solving the three-segment metal back cover structure in the prior art, which makes the consumer feel aesthetic fatigue, and if other shapes are used, the metal back cover cannot be The narrow internal space of the mobile phone simultaneously satisfies the communication requirements of the WBG antenna and the upper main antenna.

In order to solve the above technical problem, in one aspect, the present invention provides a metal back cover including a surface of a casing and a metal outer frame connected to an edge of the surface of the casing, the metal frame including a radiation belt, The radiation strip is connected to the surface of the outer casing through an insulating tape, and the two ends of the radiation strip are respectively provided with a first feeding point and a second feeding point, and the metal back cover further comprises an electric conductor, wherein the electric conductor is located at the One And connecting the radiation strip and the surface of the outer casing between the feed point and the second feed point.

Further, the radiation band is provided with a first frequency matching component, and the first frequency matching component is located between the first feed point and the electrical conductor, and is configured to enable the radiation band to transmit and receive WIFI, Bluetooth signals, and Receive the resonant frequency of the GPS signal.

Further, the radiation belt is further provided with a frequency adjustment circuit, the frequency adjustment circuit is located between the second feed point and the electrical conductor, and the frequency adjustment circuit comprises a single-pole multi-throw switch and a plurality of different resistance values. a second frequency matching component, each of the static contacts of the single-pole multi-throw switch is connected to one of the second frequency matching components, and the radiation band has different resonance frequencies by changing a communication state of the single-pole multi-throw switch .

Further, the first frequency matching component and the second frequency matching component are capacitors or inductors.

Further, a variable capacitor is disposed between the second feed point and the electrical conductor.

Further, the radiation strip is in the shape of a letter C.

Further, the insulating tape is an arc-shaped strip structure.

Further, the metal frame further includes a metal sidewall, and the metal sidewall is integrally formed with the surface of the outer casing.

Further, the insulating tape is a ceramic, glass or rubber material.

In another aspect, the present invention provides a mobile terminal, comprising the metal back cover of any of the above.

The beneficial effects of the present invention are as follows: the metal back cover radiation belt is used as the common radiation body of the WBG antenna and the upper main antenna, and the surface of the outer casing serves as a reference ground, and can simultaneously satisfy the WBG antenna under the condition that the metal wiring is short and the internal space of the mobile phone is narrow. Communication requirements with the main antenna.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other obvious modifications may be obtained from those skilled in the art without departing from the drawings.

FIG. 1 is a schematic structural view of a metal back cover according to an embodiment of the present invention.

2 is a schematic view showing the outer structure of a radiation belt of a metal back cover according to an embodiment of the present invention.

3 is a schematic view showing the inner structure of a radiation belt of a metal back cover according to an embodiment of the present invention.

4 is a schematic diagram of a circuit principle of an antenna device in an embodiment.

FIG. 5 is a schematic diagram of typical S11 parameters corresponding to an antenna system when a WBG antenna feed is fed.

6 is a schematic diagram of a circuit principle of an antenna device in another embodiment.

FIG. 7 is a schematic diagram of typical S11 parameters corresponding to the antenna system when the upper main antenna feed point is fed and the single-pole multi-throw switch is in the state one.

FIG. 8 is a schematic diagram of typical S11 parameters corresponding to the antenna system when the upper main antenna feed point is fed and the single-pole multi-throw switch is in the state two.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The utility model relates to a metal back cover, which is applied inside a mobile terminal, and the mobile terminal can be a smart phone or a tablet computer. The mobile terminal includes a display screen and a metal back cover. The metal back cover is usually used as the back cover of the mobile terminal, and houses the battery and the main board inside. The top and/or bottom of the display screen of the mobile terminal is usually provided with a non-display area, and electronic components such as a camera module, an earpiece, a Bluetooth module, a fingerprint recognition module, and the like are disposed inside the non-display area. The motherboard of the mobile terminal is also set in the non-display area. With the rapid development of smart mobile terminals, the metal back cover is an important component of mobile terminals such as mobile phones. Nowadays, it is no longer just a mobile terminal device for waterproof splashing, preventing the accumulation of gray layers and the appearance of beautiful devices. Modern The metal back cover also provides functions such as antenna radiators to enhance the performance of mobile terminals such as mobile phones, and simplifies the function of the device structure.

1 is a schematic structural view of a metal back cover according to an embodiment of the present invention. As shown, the metal back cover includes a casing surface 10 and a metal frame connected to an edge of the casing surface 10. The metal frame includes a radiation belt 12 and a radiation belt 12. In conjunction with the metal sidewall 16, the metal sidewall 16 is integrally formed with the outer casing surface 10 to form an intermediate portion 18. Specifically, the metal back cover is divided into a radiation strip 12 and a middle portion 18, wherein the radiation strip 12 is only part of the metal frame portion and is located at both ends of the metal side wall 16, and the intermediate portion 18 includes the complete outer shell surface 10 and metal. The metal side wall 16 of the outer frame portion. The complete outer casing surface 10 structure provides aesthetics and affinity to the metal back cover profile, providing a visual impact to the consumer. Preferably, the outer casing surface 10 is integrally formed with the metal side wall 16 to reduce the manufacturing steps of the metal back cover and avoid the processes of splicing, welding, etc. The shortcomings of low yield, on the other hand, the continuous and complete shape is more attractive to consumers.

Specifically, the radiation strip 12 and the intermediate portion 18 are made of a metal material. As is well known, the metal is a signal shielding material, and the radiation strip 12 and the intermediate portion 18 are connected by an insulating tape 20 which separates the radiation strip 12 from the intermediate portion 18. The radiation strip 12 is used as a strip-shaped, independent metal strip to enable the radiation to receive or radiate signals. Preferably, the insulating tape 20 is made of an insulating material such as rubber or glass. The internal terminal of the mobile terminal is provided with an electronic component and a signal transceiving module 100. The signal transceiving module 100 is connected to the radiating zone 12 through a feeding point, and satisfies the requirements of transmitting and receiving signals of different frequencies.

Further, in conjunction with FIG. 2, the radiation strip 12 is in the shape of a letter C, while the insulating strip 20 is connected in an arcuate strip structure between the radiation strip 12 and the intermediate portion 18 and between the intermediate portion 18. In one embodiment, the width of the insulating tape 20 is between 0.8 mm and 3 mm, with 2 mm being the optimum width. The letter C shape of the radiation belt 12 is beautiful in appearance, simple and generous, giving the consumer a strong visual impact effect, so that the design of other parts of the mobile terminal such as a mobile phone provides more space for exertion.

In the present embodiment, the radiation belt 12 functions as a radiator of the antenna device to transmit and receive signals. Referring to FIG. 3 and FIG. 4 , the first feeding point 122 and the second feeding point 142 are respectively disposed at two ends of the radiation belt 12 . Specifically, the first feeding point 122 is located at the left end of the radiation belt 12 and is away from the radiation belt. The left end edge of 12 is 1 mm to 25 mm, and the second feed point 142 is located at the right end of the radiation belt 12 and is 1 mm to 40 mm from the right end edge of the radiation belt 12. The first feeding point 122 is electrically connected to the signal transmitting and receiving module 100 of the system main board of the mobile terminal as a feeding point of the WBG antenna, so that the radiation belt 12 functions as a radiator of the WBG antenna to transmit and receive WIFI, Bluetooth signals and receive GPS signals; the second feeding point 142 The signal transmitting and receiving module 100 of the system main board of the mobile terminal is electrically connected to the feeding point of the upper main antenna, and the radiation band 12 is used as the radiator of the upper main antenna to transmit and receive radio frequency signals. The radiation belt 12 simultaneously functions as a radiator of the WBG antenna and the upper main antenna, and satisfies the communication requirements of the mobile terminal for the WBG antenna and the upper main antenna, and has a simple structure and convenient manufacture.

In this embodiment, the metal back cover further includes an electrical conductor 110 between the first feed point 122 and the second feed point 142 and spaced apart from the first feed point 122 by a distance of 3 mm to 25 mm. The electrical conductor 110 spans the insulating strip 20 connecting the radiating strip 12 with the intermediate portion 18 and simultaneously contacts the radiating strip 12 and the intermediate portion 18 to electrically connect the radiating strip 12 with the intermediate portion 18. The intermediate portion 18 is connected to the antenna radiator as a reference for the mobile terminal antenna device, so that the reference ground, the antenna radiator, and the signal transceiver module 100 form a complete loop, and the antenna device operates normally.

Further, the radiation band 12 is provided with a first frequency matching component 1240, and the first frequency matching component 1240 is located between the electrical conductor 110 and the first feed point 122. Specifically, the first frequency matching component 1240 is Capacitance or inductance. Referring to FIG. 5, FIG. 5 is a schematic diagram of typical S11 parameters corresponding to the antenna system when the WBG antenna feeds are fed. The size of the S11 coefficient reflects the magnitude of the return loss. When the S11 coefficient curve appears trough, the valley is back. The wave loss is small, and the antenna system can transmit and receive signals in the frequency range in which the trough is located, that is, the antenna device has a resonance state of the frequency. As shown in FIG. 5, when the signal transceiving module 100 feeds the first feed point 122, the first frequency matching component 1240 causes the antenna device to have two resonance states, wherein the low frequency resonance state corresponds to the GPS signal communication frequency and can satisfy the GPS signal. The communication frequency requirement, the high-frequency resonance state corresponds to the WIFI signal and the Bluetooth signal communication frequency, and can satisfy the communication requirements of the WIFI signal and the Bluetooth signal. The first frequency matching component 1240 causes the antenna device to have a resonant frequency for transmitting and receiving WIFI signals, Bluetooth signals, and GPS signals.

Further, the radiation band 12 is further provided with a frequency adjustment circuit 144, and the frequency adjustment circuit 144 is located between the electrical conductor 110 and the second feed point 142. In one embodiment, the frequency adjustment circuit 144 includes a single-pole multi-throw switch and a plurality of The second frequency matching component 1440 has a different resistance, wherein the second frequency matching component 1440 is a capacitor or an inductor. In other embodiments, as shown in FIG. 6, the frequency adjustment circuit 144 may also be a variable capacitor 1340 or a variable inductance component. Referring to FIG. 4, each of the static contacts of the single-pole multi-throw switch is connected to a second frequency matching component 1440. In one embodiment, the single-pole multi-throw switch is a single-pole four-throw switch 1442, and the single-pole four-throw switch 1442 has a movable contact. The electrical conductors 110 are electrically connected, four static contacts are each connected to a second frequency matching component 1440, and the resistance of each of the second frequency matching components 1440 is different. 7 and FIG. 8, when the signal transceiving module 100 feeds the second feed point 142, when the movable contacts of the single-pole four-throw switch 1442 are separately connected to two different static contacts, the valleys of the S11 coefficient curve appear in Different frequency intervals, that is, the antenna system can transmit and receive signals of different frequencies in two states, and the resonant frequency of the antenna system is different, which can meet the communication requirements of different frequency bands. Through a combination of multiple resonant states, the upper main antenna can meet the communication requirements of 700MHz-960MHz and 1700MHz-2700MHz. The frequency adjustment circuit 144 causes the radiation band 12 to have different resonance frequencies by changing the communication state of the single-pole multi-throw switch.

The metal back cover radiation strip 12 is used as a common radiation body of the WBG antenna and the upper main antenna, and can simultaneously satisfy the communication requirements of the WBG antenna and the upper main antenna under the condition that the metal trace is short and the internal space of the mobile phone is narrow.

In this embodiment, the intermediate portion 18 is provided with a first opening 32 for passing through the camera on the back of the mobile terminal; and the intermediate portion 18 is further provided with a second opening 34 for passing through the fingerprint recognition button on the back of the mobile terminal. Further, the inner rings of the first opening 32 and the second opening 34 are respectively provided with an insulating ring, and the insulating ring is used for preventing The camera itself, which is made of metal and passes through the first opening 32 or the fingerprint recognition button that passes through the second opening 34, is in contact with the metal back cover, affecting the ability of the metal back cover to transmit and receive signals as an antenna radiator. Of course, in other embodiments, the camera and the fingerprint recognition button may also be disposed on other parts of the mobile terminal, and the scope of the present invention may not be limited thereto.

The metal frame of the metal back cover is divided into a radiation strip 12 and a metal side wall 16, wherein the metal side wall 16 forms an intermediate portion 18 with the outer casing surface 10, the outer surface 10 of the outer casing is structurally complete, and the metal back cover has an aesthetic appearance and affinity for consumption. The visual impact is generated; the metal back cover radiation strip 12 is used as the common radiation body of the WBG antenna and the upper main antenna, and the communication requirements of the WBG antenna and the upper main antenna can be simultaneously satisfied under the condition that the metal wiring is short and the internal space of the mobile phone is narrow. .

The present invention also provides a mobile terminal comprising a metal back cover as described above. The mobile terminal includes a motherboard, and the metal back cover can be disposed on the motherboard. A mobile terminal refers to a computer device that can be used on the move, including but not limited to a mobile phone, a notebook, a tablet, a POS, a car computer, a camera, and the like.

The above disclosure is only a few preferred embodiments of the present invention, and of course, the scope of the present invention is not limited thereto, and those skilled in the art can understand all or part of the process of implementing the above embodiments, and according to the present invention. The equivalent changes required are still within the scope of the invention.

Claims

A metal back cover, characterized in that the metal back cover comprises a surface of a casing and a metal frame connected to an edge of the surface of the casing, the metal frame comprising a radiation belt, the radiation belt passing through the surface of the casing The insulating strip is connected, and the two ends of the radiation strip are respectively provided with a first feed point and a second feed point, and the metal back cover further includes an electric conductor, the electric conductor is located at the first feed point and the second The radiation strip and the surface of the outer casing are electrically connected between the feed points.
The metal back cover according to claim 1, wherein said radiation band is provided with a first frequency matching element, said first frequency matching element being located between said first feed point and said electrical conductor, The radiation band is provided with a resonant frequency for transmitting and receiving WIFI, Bluetooth signals, and receiving GPS signals.
The metal back cover according to claim 2, wherein said radiation belt is further provided with a frequency adjustment circuit, said frequency adjustment circuit being located between said second feed point and said electrical conductor, said frequency adjustment The circuit includes a single-pole multi-throw switch and a plurality of second frequency matching elements having different resistance values, each of the stationary contacts of the single-pole multi-throw switch is connected to one of the second frequency matching elements, and by changing the single-pole multi-throw The connected state of the switches causes the radiation bands to have different resonant frequencies.
The metal back cover of claim 3 wherein said first frequency matching element and said second frequency matching element are capacitive or inductive.
The metal back cover according to claim 2, wherein a variable capacitance is provided between the second feed point and the conductor.
The metal back cover of claim 1 wherein said radiation strip is in the shape of a letter C.
The metal back cover according to claim 1, wherein said insulating tape is an arc-shaped strip structure.
The metal back cover of claim 1 wherein said metal bezel further comprises a metal sidewall, said metal sidewall being integrally formed with said outer casing surface.
The metal back cover according to claim 1, wherein the insulating tape is a ceramic, glass or rubber material.
A mobile terminal, characterized in that the mobile terminal comprises the metal back cover according to any one of claims 1 to 9.