WO2017054278A1

WO2017054278A1 - Mobile terminal

Info

Publication number: WO2017054278A1
Application number: PCT/CN2015/093460
Authority: WO
Inventors: 李克; 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: 2015-09-28
Filing date: 2015-10-30
Publication date: 2017-04-06
Also published as: CN105305064A; CN105305064B

Abstract

The invention discloses a mobile terminal comprising a metal frame and an antenna. The metal frame is an enclosed frame having no break point, and is electrically connected to a reference ground. The antenna is located in the metal frame, and comprises a signal feed arm, a resonance adjustment arm and a grounding arm. The signal feed arm has one end connected to a signal feed node, and another end connected to the metal frame. The resonance adjustment arm is connected to the metal frame. The grounding arm has one end connected to the metal frame, and another end connected to a ground node electrically connected to the reference ground. Since the metal frame is electrically connected to the reference ground, the metal frame forms a part of the reference ground and serves as a main radiation portion of the antenna. The resonance adjustment arm is adopted to adjust a resonance frequency of a wireless network antenna, and adjust a resonance frequency of a positioning antenna by adjusting a position of the ground node where the grounding arm is connected to, thereby covering a corresponding frequency band, and meeting a performance requirement of the two-in-one positioning antenna and the wireless network antenna. The embodiment can considerably increase a structural strength of the mobile terminal by employing the radiation approach to eliminate any break point on the enclosed metal frame.

Description

Mobile terminal

Technical field

The present invention relates to electronic devices, and more particularly to a mobile terminal.

Background technique

As users' requirements for the appearance of mobile terminals continue to increase, more and more metal-appearing mobile terminals appear on the market, but most of the metal terminals in the mobile terminals have plastic partition points, which affect the structural strength, and only a few mobiles The metal middle frame of the terminal is closed loop without breakpoint. The existing published use of the mobile terminal with no breakpoints in the frame is often a ring or slot antenna. Although it satisfies the requirement of no breakpoint in the appearance of the metal frame, it only utilizes the simple implementation of the slot antenna, that is, in the metal. The middle frame is opened at intervals, which is mainly due to its relatively complicated feed structure design and inflexible antenna resonance frequency adjustment (changing the gap size), and the radiation performance of the slot antenna is relatively weak, and the middle frame The design of the gap around the circumference will also have a significant weakening effect on the structural strength of the whole machine.

In the antenna design of the prior art, there is a requirement that the positioning system and the wireless network antenna of the future mobile terminal cannot effectively support the high performance requirements and the design is simple, and how to flexibly implement the antenna in the closed-loop non-breakpoint metal middle frame mobile terminal Designing and tuning to meet the needs of future mobile terminals for appearance and antenna performance is a problem to be solved by the present invention.

Summary of the invention

The technical problem to be solved by the present invention is to provide a mobile terminal, which can realize the metal frame to be closed without break points, improve the structural strength, and realize the performance requirement of the positioning antenna and the wireless network antenna in one.

In order to solve the above technical problem, an embodiment of the present invention provides a mobile terminal, including a metal middle frame and an antenna; the metal frame is a closed frame shape without a break point, and the metal middle frame is electrically connected to a reference ground; The antenna is located in the metal middle frame, and includes a feeding arm, a tuning arm and a grounding arm, one end of the feeding arm is electrically connected to the feeding point, and the other end is connected to the metal middle frame; the tuning arm Connected to the metal middle frame;

One end of the grounding arm is connected to the metal middle frame, and the other end is electrically connected to a grounding point, and the grounding point is electrically connected to the reference ground.

The mobile terminal further includes a metal plate as a reference ground of the mobile terminal; both sides of the metal plate are connected to an inner surface of the metal middle frame.

Wherein the antenna is disposed at the top of the metal middle frame.

The metal middle frame includes two side frames connected in a frame shape, a top frame and a bottom frame; two ends of the top frame are respectively connected to the top ends of the two side frames, and two of the bottom frames are respectively The ends are respectively connected to the bottom ends of the two side frames;

The feed arm, the tuning arm and the ground arm are both connected to the top frame.

The grounding arm, the tuning arm and the feeding arm are sequentially arranged along the longitudinal direction of the top frame.

The tuning arm extends along a length of the top frame, and an end of the tuning arm adjacent to the feeding arm is connected to the top frame.

The mobile terminal further includes a main board, the main board is connected to the reference ground; and the grounding point and the feeding point are both disposed on the main board.

The grounding point and the feeding point are both disposed at a top end of the main board.

Wherein, a gap is disposed between a top end of the main board and a top of the metal middle frame, and the antenna is disposed in the gap.

Wherein, an outer surface of the metal middle frame is exposed outside the mobile terminal.

According to the mobile terminal provided by the present invention, since the metal middle frame is electrically connected to the reference ground, the metal middle frame forms a part of the reference ground and serves as the main radiator of the antenna, and the tuning arm adjusts the resonant frequency of the wireless network antenna to change the grounding arm connection. The location of the location can adjust the resonant frequency of the positioning antenna to cover the corresponding frequency band, and realize the performance requirement of the positioning antenna and the wireless network antenna in one, the adjustment of the resonant frequency is simple and flexible, and has excellent realizability and mass production; By using the radiation method, the metal frame can be closed without break points, and the structural strength of the mobile terminal can be greatly enhanced.

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 Some embodiments of the present invention, for those of ordinary skill in the art, do not pay Other drawings can also be obtained from these drawings on the premise of creative labor.

1 is a schematic structural diagram of a mobile terminal according to a preferred embodiment of the present invention;

Figure 2 is a schematic structural view of the antenna of Figure 1;

3 is a diagram showing a return loss parameter corresponding to the antenna of FIG. 1;

4 is a surface current distribution diagram of the antenna corresponding to the GPS frequency band of FIG. 1;

FIG. 5 is a surface current distribution diagram of the antenna corresponding to the WiFi band of FIG. 1. FIG.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings.

The mobile terminal provided by the preferred embodiment of the present invention may be a terminal device capable of wireless communication, such as a mobile phone, a tablet computer, or a PDA. The mobile terminal includes a metal middle frame 1 and an antenna 2, and the combination of the metal middle frame 1 and the antenna 2 can realize the wireless communication function of the positioning antenna and the wireless network antenna in one.

Referring to FIG. 1 and FIG. 2, the metal middle frame 1 is a closed frame shape without a break point, and the metal middle frame 1 is electrically connected to a reference ground. The reference ground serves as a reference for the potential of other components in the mobile terminal and constitutes the common end of the circuit signal loop. The metal middle frame 1 is electrically connected to the reference ground such that the metal middle frame 11 is a part of the reference ground. In this embodiment, the mobile terminal further includes a metal plate 3 as a reference ground for the mobile terminal.

The antenna 2 is located in the metal middle frame 1, and includes a feeding arm 21, a tuning arm 22 and a grounding arm 23. One end of the feeding arm 21 is electrically connected to the feeding point 210, and the other end is connected to the metal middle frame 1 so that the feeding is performed. The arm 21 is electrically connected to the metal middle frame 1. The tuning arm 22 is connected to the metal middle frame 1. One end of the grounding arm 23 is connected to the metal middle frame 1, and the other end is electrically connected to the grounding point 230. The grounding point 230 is electrically connected to the reference ground. The feed can be made through the feed arm 21 to transmit and receive the antenna 2 signal. By adjusting the size and shape of the tuning arm 22, the resonant frequency of the wireless network antenna can be adjusted to cover a frequency band of 2.4 GHz or 5 GHz, thereby realizing a wireless network signal, that is, implementing the WiFi antenna 2 function. By adjusting the position of the grounding point 230 of the grounding arm 23, the resonant frequency of the positioning antenna can be adjusted, and the positioning antenna can cover the frequency bands of the positioning navigation system such as GPS (Global Positioning System), GLONASS and Beidou. The antenna 2 realizes a two-in-one design of a wireless network signal and a positioning antenna, and can work in a wireless network frequency band and a positioning antenna frequency band at the same time.

In the mobile terminal provided by the embodiment of the present invention, the antenna 2 is a GPS and WiFi two-in-one antenna system. The metal middle frame 1 with closed loop and no break point is used as the main radiator of the antenna 2. The resonant frequency can be adjusted by changing the size and shape of the tuning arm 22. The metal middle frame 1 and the reference ground are electrically connected, so that the metal middle frame 1 can form a part of the mobile terminal reference ground, and the working principle is the ground radiation theory, and the partial reference ground, that is, the metal middle frame 1 is used as the main radiation of the antenna 2, The resonant frequency of the antenna 2 is adjusted using metal traces such as the tuning arm 22. By using this radiation mode, the metal frame 1 can be closed without a break point to ensure its structural strength.

The outer surface of the metal middle frame 1 is exposed outside the mobile terminal, so that the metal middle frame 1 can be used as a part of the mobile terminal outer casing to ensure the structural strength of the mobile terminal outer casing, and further ensure the appearance of the mobile terminal is beautiful, and the mobile terminal is suitable for the metal material. The need for appearance.

Both sides of the metal plate 3 are connected to the inner surface of the metal middle frame 1, and the physical structure between the metal plate 3 and the metal middle frame 1 is directly connected to ensure reliable connection of the metal middle frame 1 with the reference ground. More specifically, the metal plate 3 is connected to the metal frame 1 in a physical structure, so that the connection between the metal plates 3 is firm and reliable; at the same time, the metal plate 3 and the metal middle frame 1 can be electrically connected, thereby facilitating the use of the metal middle frame 1 to radiate. The metal plate 3 is an internal structural metal plate 3 of the mobile terminal, and the metal middle frame 1 is a part of the mobile terminal casing, and the structural connection between the two can improve the structural strength of the mobile terminal as a whole. Of course, in other embodiments, the metal plate 3 may be connected to the metal middle frame 1 only by one side, or the metal plate 3 and the metal middle frame 1 may be electrically connected by wires, FPC or the like. through.

The antenna 2 is placed at the top of the metal frame 1 to increase the signal strength of the antenna 2 while avoiding the influence of the hand on the antenna 2 signal. More specifically, the metal middle frame 1 includes two side frames 11 connected in a frame shape, a top frame 12 and a bottom frame 13; two ends of the top frame 12 are respectively connected to the two side frames 11 At the top end, two ends of the bottom frame 13 are respectively connected to the bottom ends of the two side frames 11. The entire metal middle frame 1 is frame-shaped to match the shape of the mobile terminal. The connection between the side frame 11 and the top frame 12 and the connection between the side frame 11 and the bottom frame 13 can be rounded so that the four corners of the mobile terminal are circular arcs, so that the mobile terminal has a beautiful appearance. .

The feed arm 21, the tuning arm 22 and the ground arm 23 are both connected to the top frame 12 such that the respective metal traces of the antenna 2 are located at the top of the mobile terminal to increase the signal strength of the antenna 2. Here, in other embodiments, the tuning arm 22 may also be coupled to the top end of the side frame 11, and the feed arm 21 may also be coupled to the top end of the side frame 11.

The grounding arm 23, the tuning arm 22 and the feeding arm 21 are sequentially arranged along the length direction of the top frame 12, so that the grounding arm 23 and the feeding arm 21 are located at both ends of the top frame 12, Tuning arm 22 bits Between the grounding arm 23 and the feeding arm 21, the structure is reasonable, the space occupied by the antenna 2 is reduced, and the size of the tuning arm 22 is adjusted.

Further, the tuning arm 22 extends along the length of the top frame 12, and one end of the tuning arm 22 adjacent to the feeding arm 21 is connected to the top frame 12. The space can be fully utilized to facilitate the design of the length of the tuning arm 22, which facilitates adjustment of the resonant frequency of the antenna 2.

The mobile terminal further includes a main board (not shown) connected to the reference ground; the grounding point 230 and the feeding point 210 are both disposed on the main board. The main board can be fixedly connected to the metal plate 3 as a reference ground, and the two are electrically connected. A line can be provided on the motherboard to electrically connect the ground point 230 to the reference ground. The feeding point 210 is disposed on the main board, which can facilitate feeding the antenna 2 and facilitate electrical connection between the main board and the feed point arm. The grounding point 230 and the feeding point 210 are both disposed at the top end of the main board to facilitate the fixed connection between the main board and the feeding arm 21 and the grounding arm 23. The feeding arm 21 is electrically connected to the main board, and the connection point between the feeding arm 21 and the main board can form a feeding point 210, and the main board can feed the feeding arm. The resonant frequency of the wireless network antenna 2 can be adjusted by the cooperation of the different shapes and sizes between the tuning arm 22 and the feed arm 21.

A gap is provided between the top of the main board and the top of the metal middle frame 1, and the antenna 2 is disposed in the gap to prevent the electronic components on the main board from affecting the antenna 2 signal. The space between the main board and the top frame 12 makes it easy to set components such as the earpiece. Of course, in other embodiments, the top edge of the main board may also be connected to the top frame 12, and the two may also be seamlessly connected.

The above is a specific implementation manner of the grounding arm 23, the tuning arm 22 and the feeding arm 21 provided by the embodiment. Of course, in other embodiments, in order to cover a certain frequency band, the grounding arm 23, the tuning arm 22 and the feeding The arm 21 can be varied in a variety of shapes and sizes, and the number of tuning arms 22 and feed arms 21 is not limited to one.

The metal plate 3 may be square or substantially square so that the shape of the metal plate 3 matches the shape of the metal middle frame 111 to facilitate the connection between the metal plate 3 and the metal middle frame 1. In this embodiment, the two sides of the metal plate 3 are fixedly connected to the inner surfaces of the side frames 11 respectively.

The antenna 22 provided in this embodiment can operate at low frequency and high frequency at the same time, and can cover several frequency bands by adjusting the size and shape of the tuning arm 22. 3 illustrates an S-parameter (return loss) corresponding to an operation mode formed by the antenna 2 of the mobile terminal according to an embodiment of the present invention, where the valley of the parameter trace corresponds to the GPS frequency band and the WiFi frequency band from left to right. It can be seen that this working mode can support both GPS and WiFi.

4 illustrates a surface power of an antenna 2 corresponding to a GPS band of a mobile terminal according to an embodiment of the present invention. Flow distribution, FIG. 5 illustrates the surface current distribution of the antenna 2 corresponding to the WiFi band of the mobile terminal according to the embodiment of the present invention. From the surface current distribution, the surface current of the GPS band is mainly distributed near the grounding point 230, and the surface current of the WiFi band is mainly distributed on the tuning arm 22 and its connection point with the metal middle frame 1, thereby indicating the adjustment grounding point. The position of the 230 and the size of the tuning arm 22 can be easily divided into the GPS and WiFi antenna resonance frequencies, and the feed design is simple. Therefore, the GPS and WiFi two-in-one antenna design of the present invention is extremely easy to implement. Sex and mass production, can well meet the growing demand for GPS and WiFi antenna performance in future mobile terminals.

The invention provides an easy-to-implement antenna design of a wireless network antenna and a positioning antenna based on a frameless metal middle frame 1 , which can reduce the structural design requirements of the antenna system for the frame 1 of the mobile terminal metal without a break point. The structural strength of the mobile terminal is greatly enhanced; the radiation performance of the wireless network antenna and the positioning antenna can be significantly improved by a simple feed structure design, and the resonant frequency of the wireless network antenna and the positioning antenna can be adjusted very flexibly, and most importantly, Excellent and practical and mass production.

The embodiments described above do not constitute a limitation on the scope of protection of the technical solutions. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above-described embodiments are intended to be included within the scope of the technical solutions.

Claims

A mobile terminal, comprising: a metal middle frame and an antenna; the metal frame is a closed frame shape without a break point, the metal middle frame is electrically connected to a reference ground; and the antenna is located in the metal middle frame The utility model comprises a feeding arm, a tuning arm and a grounding arm, wherein one end of the feeding arm is electrically connected to the feeding point, and the other end is connected to the metal middle frame; the tuning arm is connected to the metal middle frame;

One end of the grounding arm is connected to the metal middle frame, and the other end is electrically connected to a grounding point, and the grounding point is electrically connected to the reference ground.
The mobile terminal according to claim 1, wherein the mobile terminal further comprises a metal plate as a reference ground of the mobile terminal; both sides of the metal plate are in the metal The inner surface of the frame is connected.
The mobile terminal of claim 1, wherein the antenna is disposed at a top portion within the metal middle frame.
The mobile terminal according to claim 3, wherein the metal middle frame comprises two side frames connected in a frame shape, a top frame and a bottom frame; the two ends of the top frame are respectively connected to the two a top end of the side frame, the two ends of the bottom frame are respectively connected to the bottom ends of the two side frames;

The feed arm, the tuning arm and the ground arm are both connected to the top frame.
The mobile terminal according to claim 4, wherein the grounding arm, the tuning arm, and the feeding arm are sequentially arranged along a longitudinal direction of the top frame.
The mobile terminal according to claim 5, wherein the tuning arm extends along a length direction of the top frame, and an end of the tuning arm adjacent to the feeding arm is connected to the top frame.
The mobile terminal according to claim 1, wherein the mobile terminal further comprises a main board, the main board is connected to the reference ground; and the grounding point and the feeding point are both disposed on the main board.
The mobile terminal of claim 7, wherein the grounding point and the feeding point are both disposed at a top end of the main board.
The mobile terminal according to claim 6, wherein a gap is provided between a top end of the main board and a top of the metal middle frame, and the antenna is disposed in the gap.
The mobile terminal of claim 1, wherein an outer surface of the metal middle frame is exposed outside the mobile terminal.