CN103531882B - electronic device - Google Patents

Abstract

The invention provides an electronic device which comprises a metal shell, a first opening, a first metal wiring, a first grounding point and a first current zero point. The first opening penetrates through the metal shell. The first metal wiring is located in the first opening, a first end of the first metal wiring is electrically connected with the side of the first opening, and a second end of the first metal wiring is provided with a first feed-in point. The first grounding point and the first current zero point are positioned on the side of the first opening. The metal shell forms a first loop antenna by utilizing a first excitation path from a first feed point to a first grounding point so as to receive or transmit a first radio frequency signal.

Description

electronic device

technical field

The present invention relates to an electronic device, and more particularly to an electronic device with a loop antenna.

Background technique

Due to the progress and development of the times, current electronic devices such as Smart Phones, Tablet PCs, and Notebook PCs are all developing towards thinner and thinner appearances. In addition, in order to attract the attention of consumers, most of the current electronic devices use metal back covers to highlight the uniqueness and appearance of the products.

Generally speaking, in order to meet the thin design requirements, existing electronic devices can use Laser Direct Structuring (LDS) technology to directly form the antenna on the outer surface of the plastic casing by laser, and thereby strive for the antenna. effective radiation space. However, such a design usually requires a relatively high production cost. Furthermore, due to the metallic appearance design, an additional antenna window (antenna window) must be opened on the metal back cover of the existing electronic device, so that the antenna disposed on the metal casing has better radiation efficiency. However, this design method will destroy the overall appearance design of the electronic device.

In other words, how to balance the production cost of the electronic device and the radiation efficiency of the antenna has become a major challenge in the design of the electronic device in response to the thinning and appearance design requirements of the electronic device.

Contents of the invention

The invention provides an electronic device, which uses the opening in the metal shell and the metal wiring to form the excitation path of the loop antenna, and uses the metal shell to improve the appearance design of the electronic device.

The invention provides an electronic device, which includes a metal casing, a first opening, a first metal wiring, a first grounding point and a first current zero point. The first opening runs through the metal casing. The first metal wiring is located in the first opening, and the first end of the first metal wiring is electrically connected to one side of the first opening, and the second end of the first metal wiring has a first feeding point. The first ground point and the first current zero point are located on the side of the first opening, wherein the metal shell uses the first excitation path from the first feeding point to the first ground point to form a first loop antenna to receive or transmit the first loop antenna. a radio frequency signal.

In an embodiment of the present invention, the above-mentioned electronic device further includes a second opening, a second metal wiring, a second grounding point, and a second current zero point. The second opening runs through the metal shell. The second metal wiring is located in the second opening, and the first end of the second metal wiring is electrically connected to the side of the second opening, and the second end of the second metal wiring has a second feeding point. The second ground point and the second current zero point are located on the side of the second opening, wherein the metal shell uses the second excitation path from the second feeding point to the second ground point to form a second loop antenna to receive or transmit a second radio frequency signal.

In an embodiment of the present invention, the metal casing, the first metal wiring and the second metal wiring are integrally formed.

Based on the above, the present invention utilizes the opening on the metal shell and the metal wiring inside the opening to form the excitation path of the loop antenna. In this way, the metal shell can not only meet the requirements of appearance design, but also the electronic device can use the metal shell to send and receive radio frequency signals, thereby ensuring the radiation efficiency of the antenna. In addition, through the integral molding of the metal casing and the metal wiring, the appearance design of the electronic device can be further improved and the production cost of the electronic device can be reduced.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a partial structure of an electronic device according to an embodiment of the present invention;

2 is a schematic diagram of an excitation path of a loop antenna according to an embodiment of the present invention;

FIG. 3 is a partial schematic diagram of an electronic device according to another embodiment of the present invention.

Explanation of reference signs:

10: electronic device;

100: Metal shell;

110, 210: opening;

120, 220: metal wiring;

SD1, SD2: side;

GP 1, GP2: ground point;

ZP1, ZP2: current zero point;

FP1, FP2: feed point;

EP1, EP2: excitation path;

230: function module;

231, 232: locking pieces;

240, 250: decorative film.

detailed description

FIG. 1 is a schematic diagram of a partial structure of an electronic device according to an embodiment of the invention. Referring to FIG. 1 , the electronic device 10 includes a metal casing 100 , a first opening 110 , a first metal wiring 120 , a first ground point GP 1 , a first zero current point ZP1 , and a first feeding point FP 1 . Wherein, the first opening 110 runs through the metal casing 100 . The first metal wiring 120 is located in the first opening 110 . In addition, the first end of the first metal wiring 120 is electrically connected to the side SD1 of the first opening 110 , and the second end of the first metal wiring 120 has a first feeding point FP1 . In this embodiment, the metal case 100 can be, for example, the back cover of the electronic device 10 , and the first metal wiring 120 is integrally formed with the metal case 100 , but the present invention is not limited to the above-mentioned embodiment.

The first ground point GP1 and the first current zero point ZP1 are located at the side SD1 of the first opening 110 . Wherein, the metal shell 100 utilizes the first excitation path EP1 from the first feed point FP1 to the first ground point GP1 to form a first loop antenna (loop antenna) to receive or transmit a first radio frequency signal. Wherein, the first loop antenna may be, for example, a half-wavelength loop antenna, so the length of the first excitation path EP1 may be, for example, half the wavelength of the first radio frequency signal. In addition, according to the characteristics of the loop antenna, there is a first current zero point ZP1 on the first excitation path EP1.

For example, FIG. 2 is a schematic diagram of an excitation path of a loop antenna according to an embodiment of the present invention. As shown by the arrows in FIG. 2 , the half-wavelength loop antenna can be fed with a current through the first feeding point FP1 . In addition, the current from the first feeding point FP1 and the excitation current from the system ground plane are opposite to each other. Therefore, on the excitation path from the first feed point FP1 to the first ground point GP1, a first current zero point ZP1 will be formed. In addition, the first current zero point ZP1 is approximately located in the center of the first excitation path EP1 . In other words, in this embodiment, the distance from the first current zero point ZP1 to the first ground point GP1 may be, for example, a quarter of the wavelength of the first radio frequency signal. In addition, the current zero point ZP1 on the first excitation path EP1 may, for example, be located near the junction of the first end of the metal wiring 120 and the side SD1 .

It is worth mentioning that, in this embodiment, the metal casing 100 is electrically connected to a system ground plane (not shown) in the electronic device 10 . In addition, in practical applications, the electronic device 10 can transmit the signal from the first feeding point FP1 to its internal transceiver (not shown) through a coaxial line (not shown), wherein the coaxial The inner conductor of the line is electrically connected to the first feeding point FP1, and the outer conductor of the coaxial line is electrically connected to the system ground plane. Furthermore, in addition to using the coaxial cable to feed the antenna signal, the electronic device 10 can also use conductive elements such as shrapnel or pogo pins to replace the coaxial cable, thereby reducing signal transmission loss. .

On the other hand, although the embodiment of FIG. 1 lists the shapes of the first opening 110 and the metal wiring 120 , it is not intended to limit the present invention. Wherein, those skilled in the art can adjust the shapes of the first opening 110 and the second metal wiring 120 according to the frequency of the first radio frequency signal and the requirement of impedance matching. In other words, the shape of the first opening 110 may be, for example, a rectangle or other irregular geometric shapes, and the shape of the metal wiring 120 may be, for example, a strip shape or other irregular geometric shapes.

In another embodiment of the present invention, the electronic device 10 can also form a plurality of loop antennas through a metal casing. For example, FIG. 3 is a partial schematic diagram of an electronic device according to another embodiment of the present invention. Compared with the embodiment in FIG. 1 , the electronic device 10 in FIG. 3 further includes a second opening 210 , a second metal wiring 220 , a second ground point GP2 , a second zero current point ZP2 , and a second feeding point FP2 .

As shown in FIG. 3 , the second opening 210 runs through the metal casing 100 . The second metal wiring 220 is located in the second opening 210 . In addition, the first end of the second metal wiring 220 is electrically connected to the side SD2 of the second opening 210 , and the second end of the second metal wiring 220 has a second feeding point FP2 . In this way, the metal casing 100 can utilize the second excitation path EP2 between the second ground point GP2 and the second feed point FP2 to form a second loop antenna to receive or transmit the second radio frequency signal. In addition, the length of the second excitation path EP2 may be, for example, one half of the wavelength of the second radio frequency signal, and the distance from the second current zero point ZP2 to the second ground point GP2 may be, for example, one quarter of the wavelength of the second radio frequency signal. one.

In addition, similar to the embodiment in FIG. 1 , the metal shell 100 , the first metal wiring 120 and the second metal wiring 220 are integrally formed. In addition, those skilled in the art can adjust the shapes of the second opening 210 and the second metal wiring 220 according to the frequency of the second radio frequency signal and the requirement of impedance matching. Furthermore, the electronic device 10 can also transmit the signal from the second feeding point FP2 to its internal transceiver through a conductive element such as a coaxial cable, a shrapnel, or a thimble.

It is worth mentioning that the electronic device 10 can form two loop antennas operating in different frequency bands through the first excitation path EP1 and the second excitation path EP2 . For example, in an exemplary embodiment of the present invention, the metal housing 100 can use the first excitation path EP1 to form a first loop antenna operating at 2.4 GHz, and can use the second excitation path EP2 to form a loop antenna operating at 5 GHz. second loop antenna, and the present invention is not limited to the above-mentioned embodiments.

Looking further, in another exemplary embodiment of the present invention, as shown in FIG. 3 , the electronic device 10 further includes a function module 230 . Wherein, the function module 230 may be, for example, a camera module. Here, the functional module 230 is locked on the metal housing 100 by the locking member 231 and the locking member 232 . It is worth noting that even if the current null of the loop antenna is connected to other surrounding metal elements, it will not affect the resonant mode of the loop antenna. Therefore, in terms of the configuration of the locking member 231 and the locking member 232 , the locking members 231 and 232 respectively correspond to the first current zero point ZP1 and the second current zero point ZP2 . That is, in actual configuration, the metal shell 100 also includes two openings (not shown), and the two openings respectively pass through the metal shell 100 corresponding to the first current zero point ZP1 and the second current zero point ZP2 . In this way, the locking pieces 231 and 232 can pass through the two openings respectively, thereby causing the functional module 230 to be locked on the metal housing 100 .

It is worth mentioning that, in order to enhance the appearance design of the electronic device 10 , in the embodiment of FIG. 3 , the electronic device 10 further includes a decoration film 240 and a decoration film 250 . Wherein, the decoration film 240 and the decoration film 250 are used to fill the first opening 110 and the second opening 210 respectively. In addition, the appearance of the decoration film 240 and the decoration film 250 can also be decorated with a metal texture, thereby making the appearance of the metal casing 100 more consistent.

To sum up, the present invention provides an electronic device that utilizes the opening on the metal casing and the metal wires in the opening to form the excitation path of the loop antenna. In this way, the metal shell can not only meet the requirements of appearance design, but also the electronic device can use the metal shell to send and receive radio frequency signals, thereby ensuring the radiation efficiency of the antenna. In addition, the combination of the antenna and the casing also contributes to the thinner design of the electronic device. Furthermore, through the integral molding of the metal casing and the metal wiring, the appearance design of the electronic device can be further improved and the production cost of the electronic device can be reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (6)

1. An electronic device, characterized in that, comprising: a metal shell; a first opening, passing through the metal shell; A first metal wiring is located in the first opening, and the first end of the first metal wiring is electrically connected to one side of the first opening, and the second end of the first metal wiring has a first a feed-in point; and A first grounding point and a first current zero point are located on the side of the first opening, wherein the metal shell utilizes a first excitation path from the first feeding point to the first grounding point to form a a first loop antenna for receiving or transmitting a first radio frequency signal, Wherein the length of the first excitation path is one-half of the wavelength of the first radio frequency signal, the first current zero point is located on the first excitation path, and the distance from the first current zero point to the first grounding point is a quarter of the wavelength of the first radio frequency signal. 2. The electronic device according to claim 1, further comprising: A first decorative film is used to fill up the first opening. 3. The electronic device according to claim 1, further comprising: a second opening, passing through the metal shell; A second metal wiring is located in the second opening, and the first end of the second metal wiring is electrically connected to one side of the second opening, and the second end of the second metal wiring has a first two feed points; and A second grounding point and a second current zero point are located on the side of the second opening, wherein the metal shell utilizes a second excitation path from the second feeding point to the second grounding point to form a a second loop antenna for receiving or transmitting a second radio frequency signal, Wherein the length of the second excitation path is one-half of the wavelength of the second radio frequency signal, the second current zero point is located on the second excitation path, and the distance from the second current zero point to the second ground point is a quarter of the wavelength of the second radio frequency signal. 4. The electronic device according to claim 3, further comprising: A functional module is fixed on the metal housing with a first locking piece and a second locking piece, and the first locking piece and the second locking piece correspond to the first current zero point and the second current zero point respectively . 5. The electronic device according to claim 3, further comprising: A second decorative film is used to fill up the second opening. 6 . The electronic device according to claim 3 , wherein the metal casing, the first metal wiring and the second metal wiring are integrally formed.