CN115395227A - Electronic device - Google Patents

Abstract

The present application relates to an electronic device. The electronic device includes: the antenna comprises a conductive frame, a near field communication unit, an antenna coil and a tuning switch circuit. The conductive frame is provided with a broken seam, and a first free end and a second free end of the conductive frame are formed at the position of the broken seam; the near field communication unit is used for providing excitation current; the antenna coil and the conductive frame are used for transmitting excitation current together; the tuning switch circuit is connected in series between the first free end and the second free end of the broken joint position; the tuning switch circuit is used for blocking exciting current at a working frequency point of the near field communication unit and transmitting feed current at a preset resonant frequency point; the feed current is used for exciting the conductive frame to radiate a preset radio frequency signal, and the preset resonant frequency point is higher than the working frequency point. The electronic equipment that this embodiment provided has improved electronic equipment's NFC communication performance through multiplexing conductive frame and setting up the tuning switch circuit that can supply feed current to pass through, and is favorable to realizing miniaturized design, reduces the electronic equipment volume.

Description

Electronic device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to an electronic device.

Background

Along with the development of communication technology and wearable technology, wearable equipment such as smart watches, bracelets have obtained more and more extensive application based on its portability and powerful communication function day by day. For example, the wearable device can be connected with a mobile phone, measure physiological parameters, record motion tracks and the like, and can also support mobile payment such as subway, public transport and the like, electronic ticketing, entrance guard, mobile identity recognition, anti-counterfeiting and the like. These Communication functions implementations rely on Near Field Communication (NFC).

However, the applicant finds that electronic devices such as wearable devices in the traditional technology have poor NFC communication effect in the implementation process. For example, when a user swipes a card using a wearable device close to a gate of a subway, a failure to swipe the card often occurs.

Disclosure of Invention

The embodiment of the application provides an electronic device which is high in communication reliability.

An electronic device, comprising:

the conductive frame is provided with a broken seam, and a first free end and a second free end of the conductive frame are formed at the position of the broken seam;

a near field communication unit for providing an excitation current;

the antenna coil, the antenna coil and the conductive frame are used for transmitting excitation current together;

the tuning switch circuit is connected between the first free end and the second free end of the broken joint position in series;

the tuning switch circuit is used for blocking the excitation current at the working frequency point of the near field communication unit and transmitting the feed current at the preset resonant frequency point; the feeding current is used for exciting the conductive frame to radiate a preset radio frequency signal, and the preset resonant frequency point is higher than the working frequency point.

According to the electronic equipment, the break joint is formed in the conductive frame, the tuning switch circuit is connected in series at the position of the break joint, the feed current fed in from any point on the conductive frame is transmitted on the conductive frame through the tuning switch circuit, radiation of the preset radio-frequency signal corresponding to the feed current is realized at the conductive frame and the position of the break joint, and the electronic equipment is favorably miniaturized under the condition that the size requirement of an antenna radiator required by preset radio-frequency signal transmission is met. In addition, the excitation current provided by the near field communication unit cannot be transmitted on a conductive path formed by the antenna coil and the conductive frame through the tuning switch circuit, so that the NFC signal radiation on the conductive path is realized, the preset radio frequency signal radiation and the NFC signal radiation are carried out through the multiplexing conductive frame, and the NFC communication performance improvement and miniaturization design of the electronic equipment are facilitated.

In addition, the conductive frame is used for transmitting excitation current or feeding current, the conductive frame is realized based on a tuning switch circuit, multiplexing of the conductive frame is realized without adding a control device, and the cost of electronic equipment is reduced and the miniaturization design is facilitated.

Drawings

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

FIG. 1 is a diagram illustrating one embodiment of an electronic device;

FIG. 2 is a second schematic diagram of an embodiment of an electronic device;

FIG. 3 is a schematic diagram of the antenna coil, tuning switch circuit, and conductive bezel of the electronic device in one embodiment;

FIG. 4 is a third schematic structural diagram of an electronic device according to an embodiment;

FIG. 5 is a fourth schematic diagram of an embodiment of an electronic device;

fig. 6 is a diagram illustrating the distribution of magnetic field strength of a large-sized coil in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first break may be referred to as a second break, and similarly, a second break may be referred to as a first break, without departing from the scope of the present application. Both the first and second break are breaks, but they are not the same break.

It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.

As shown in fig. 1 to 3, in one embodiment, an electronic device provided in an embodiment of the present application includes: a conductive bezel 200, a near field communication unit 400, an antenna coil 600 and a tuning switch circuit 800.

In this embodiment, a broken seam DF is formed on the conductive frame 200, and a first free end and a second free end of the conductive frame 200 are formed at the position of the broken seam DF. The break DF divides the conductive frame 200 into at least one segment of conductor that is broken. It should be understood that when the seam DF is not unique, the first and second free ends of the conductive bezel 200 are in multiple sets, for example, 2 sets of the first and second free ends at the DF1 and DF2 positions as shown in fig. 2.

A Near Field Communication (NFC) unit 400 is used to supply an excitation current to enable radiation of an NFC signal (Near Field Communication signal) on a transmission path of the excitation current. Alternatively, the NFC unit 400 may use a double-end feeding manner, and feed out are implemented by exciting current through the NFC _ P terminal and the NFC _ N terminal as shown in the figure. The NFC unit 400 is configured to provide a differential excitation current, and when receiving the same interference, the dual-end communication method may subtract the same interference signal based on the differential compared to the single-end communication, so as to improve the anti-interference performance of the excitation current, and further improve the stability of the NFC communication.

The antenna coil 600 is connected to the conductive frame 200 for transmitting an excitation current. The conductive frame 200 is used as a part of the excitation current transmission path, so that the radiation area of the NFC signal can be increased, and the near field communication performance of the electronic device can be improved. The connection between the antenna coil 600 and the conductive frame 200 may be implemented in various manners, and the general connection principle is that the directions of the induced currents of the antenna coil 600 and the conductive frame 200 in the radio frequency fields generated by other devices are the same, the radiation field of the antenna coil 600 and the radiation field of the conductive frame 200 are mutually enhanced, and the NFC communication performance is improved.

The antenna coil 600 may be implemented by FPC (Flexible Printed Circuit board), PCB (Printed Circuit board), printed wire, or LDS (Laser-Direct-structuring) metal, or may be implemented in a combination of the above manners. In addition, the antenna coil 600 may also be made of a new material having a radiation property equivalent to that of metal.

The number of turns of the antenna coil 600 may be determined based on an arrangement space of the electronic device, and the intervals between the turns are set on the principle of not affecting each other.

The tuning switch circuit 800 is connected in series between the first free end and the second free end at the position of the break DF. The tuning switch circuit 800 is configured to block the excitation current at the working frequency point of the near field communication unit 400, and transmit the feed current at a preset resonant frequency point; the feeding current is used to excite the conductive frame 200 to radiate a predetermined radio frequency signal, and the predetermined resonant frequency point is higher than the operating frequency point.

The operating frequency point of the near field communication unit 400 may be 13.56MHz, which is a low frequency signal. The predetermined rf signal may include, but is not limited to, a cellular network signal, a Wireless Fidelity (WiFi), a Global Positioning System (GPS) signal, a Bluetooth (BT) signal, and the like. The operating frequency of the preset rf signal is above 850MHz, and is higher than 13.56MHz, that is, the preset resonant frequency of the preset rf signal is higher than the operating frequency of the near field communication unit 400. Based on the difference, a proper tuning switch circuit 800 may be set, so that the tuning switch circuit 800 is in a high impedance state at the operating frequency point, and the excitation current is not allowed to pass through the break DF, at this time, the excitation current of the NFC unit 400 is transmitted through the antenna coil 600 and the conductive frame 200, and the conductive frame 200 acts on the radiation of the NFC signal, thereby improving the NFC communication performance.

The tuning switch circuit 800 is in a low resistance state at a preset resonant frequency point of the non-near-field communication, and at this time, the feed current may be transmitted in the conductive frame 200 through the break DF. When a tuning switch circuit 800 is connected in series between the first free end and the second free end at each broken joint DF, the size of the conductive frame 200 acting on feed current transmission is equivalent to the size of the conductive frame 200 without the broken joint DF, so that the problem of insufficient size of an antenna radiator for performing preset radio frequency signal radiation due to the broken joint DF can be avoided, and the size of the electronic device can be reduced. And under the adaptation selection of the tuning switch circuit 800, the automatic switching between the NFC signal transmission and the preset radio frequency signal transmission can be realized, and a control device does not need to be introduced to control the multiplexing process of the conductive frame 200, so that the cost is low.

Optionally, a tuning switch circuit 800 may be connected in series between the first free end and the second free end of each break DF.

The electronic device provided by the implementation of the application, set up the broken joint DF on the conductive frame 200, and set up the tuning switch circuit 800 at the broken joint DF, the feed current that feeds in from a little on the conductive frame 200 is transmitted on the conductive frame 200 through the tuning switch circuit 800, avoid the broken joint to set up down, reduce the antenna radiator length that is used for radiating the preset radio frequency signal, be favorable to realizing the miniaturization of electronic device, and this tuning switch circuit 800 does not allow the excitation current to pass through, make the excitation current transmit on the conductive path that antenna coil 600 and conductive frame 200 constitute, through multiplexing conductive frame 200, not only can improve electronic device's NFC communication performance, the occupation space of antenna has still been saved. The scheme provided by the embodiment of the application is beneficial to improving the NFC communication performance of the electronic equipment and realizing miniaturization design.

In addition, by multiplexing the conductive bezel 200, the turns of the antenna coil 600 and the interference between the antenna coil 600 and the conductive bezel 200 are reduced in a limited space.

In the embodiment of the present application, as shown in fig. 1, the first end of the antenna coil 600 is connected to the first free end of the fracture site. The first signal terminal NFC _ P of the near field communication unit 400 is connected to the second free terminal of the broken seam position, and the second signal terminal NFC _ N of the near field communication unit 400 is connected to the second terminal of the antenna coil 600. When the gap is not unique, the first free end of the gap position is the first free end of the conductive frame 200 at one gap position, and the second free end is the second free end of the same gap position as the first free end, so as to ensure that the conductive frame 200 is completely connected to the antenna coil 600, and is used for enhancing the NFC signal. The first signal terminal of the near field communication unit 400 may be NFC _ P as shown in fig. 1 and 2, and the second signal terminal may be NFC _ N as shown in fig. 1 and 2. As shown in fig. 1 and fig. 2, the excitation current is fed into the conductive bezel 200 through the second free end, passes through the conductive bezel 200 and the antenna coil 600, and then flows back to the near field communication unit 400 through the second end of the antenna coil 600.

As shown in fig. 1, in one embodiment, the first signal terminal NFC _ P of the near field communication unit 400 provides an excitation current, the excitation current is fed into the conductive frame 200 from the second free end of the break DF, the current is transmitted in the conductive frame 200 in a clockwise direction, and when the excitation current flows to the first free end of the break DF, the excitation current flows to the first terminal of the antenna coil 600 through the connection between the first free end and the first terminal of the antenna coil 600, and is transmitted in the antenna coil 600 in the clockwise direction from the first terminal, and flows back to the second signal terminal NFC _ N of the near field communication unit at the second terminal of the antenna coil 600.

In the embodiment of the present application, as shown in fig. 2 and 3, the seams DF include at least a first seam DF1 and a second seam DF2. The number of the first broken joints DF1 is one, and the number of the second broken joints DF2 is one, that is, at least two broken joints on the conductive frame 200 are provided.

For the solution that the number of the broken seams is at least two, in addition to the implementation of the connection between the conductive frame 200 and the antenna coil 600 in the connection manner shown in fig. 2, as shown in fig. 3, the first end of the antenna coil 600 is connected to the first free end at the position of the first broken seam DF1, and the second end of the antenna coil 600 is connected to the second free end at the position of the first broken seam DF1, that is, the connection with the antenna coil 600 is implemented at two free ends at the same broken seam position DF1, in order to ensure that the conductive frame 200 can completely act on the radiation of the NFC signal, the first free end at the position of the second broken seam DF2 is connected to the first signal end of the near field communication unit 400, and the second free end at the position of the second broken seam DF2 is connected to the second signal end of the near field communication unit 400. The excitation current provided by the NFC unit 400 is fed into the conductive frame 200 through the first free end at the second break DF2, and after being transmitted through the conductive frame 200 and the antenna coil 600, flows back to the NFC unit 400 through the second free end at the second break DF2, and the conductive frame 200 acts on enhancing the NFC signal.

For a wearable device with a small volume, the setting space of the antenna radiator is limited, but the functional requirements of the electronic device are more and more diversified. When the user uses the electronic device, the LTE (Long Term Evolution) signal communication is carried out, and the measurement of physiological parameters such as blood oxygen and the like, the swiping of a subway card and the like are also carried out. Under different functional requirements, there are differences in the size requirements for antenna radiators for radio frequency signal radiation in electronic devices. In the embodiment of the present application, as shown in fig. 3, the seam further includes at least one third seam DF3, and a tuning switch circuit 800 is connected in series between the first free end and the second free end of each third seam DF 3.

In the embodiment of the present application, the tuning switch circuit 800 includes: a capacitor (e.g., C1, C2 as shown in fig. 3) connected in series between the first free end and the second free end at the location of the break DF. The tuned switch circuit 800 may comprise only a capacitor, for example a capacitor of 30pF, with a simple and feasible and low cost implementation.

When the tuning switch circuit 800 is realized by adopting the capacitor with the capacitance of 30pF, according to the impedance calculation formula of the capacitor, the impedance of the capacitor with the capacitance of 30pF at the working frequency point of 13.56MHz of the near field communication unit 400 is 391.236j, and the capacitor is in a high impedance state; the impedance of the capacitor with the capacitance of 30pF at the frequency point of 850MHz is 6.241j, and the capacitor is in a low-impedance state, and is in a low-impedance state at the frequency point of more than 850 MHz. By connecting a capacitor with 30pF in series at the position of the broken joint, the NFC signal with the frequency of 13.56MHz is equivalent to an open circuit state, and the requirement that the broken joint is needed to avoid the conductive frame 200 inhibiting the NFC signal is met; for the preset resonant frequency point with the working frequency point larger than 850MHz, the capacitor is equivalent to a short circuit state, and the preset radio frequency signal can be transmitted on the conductive frame 200 through the capacitor. In practical application, the capacitance value of the capacitor can be adjusted according to requirements, for example, the capacitance values of C1 and C2 in fig. 3 can be different.

Of course, the tuning switch circuit 800 may also adopt other circuit implementation manners as long as it is in a high-impedance state at the working frequency point of the nfc unit 400 and in a low-impedance state at the preset resonant frequency point.

In this embodiment of the application, the first signal terminal NFC _ P and the second signal terminal NFC _ N of the near field communication unit 400 are connected to the antenna coil 600 and the conductive frame 200 through the matching circuit. The matching circuit is used for matching the impedance when the exciting current is transmitted. Optionally, a filter circuit may be connected in series between the matching circuit and the near field communication unit 400, so as to filter out other interference signals except the excitation current. The filter circuit may employ an LC filter circuit. The matching circuit may be implemented using a capacitive device.

In this embodiment, the conductive frame 200 further has a feeding point, and the electronic device further includes a feeding source for providing a feeding current, where the feeding current is fed to the conductive frame 200 through the feeding point, so as to excite the conductive frame 200 to radiate a predetermined radio frequency signal. For electronic devices with multiple types of preset radio frequency signal communication requirements, the number of feed points may be set to be multiple, the feed sources are set in one-to-one correspondence with the feed points, and each feed source may provide a feed current to the conductive frame 200, so as to excite the conductive frame 200 to radiate the preset radio frequency signal corresponding to the feed source. Therefore, transmission of various types of preset radio frequency signals such as LTE signals, GPS signals, wiFi signals and BT signals of the electronic equipment is achieved.

The feeding point may be a contact feeding point or a coupling feeding point. Similarly, the connection between the antenna coil 600 and the conductive bezel 200 may be implemented by a contact connection or a coupling connection.

Each tuning switch circuit 800 may enable blocking of an excitation current provided by the near field communication unit 400. The parameters of the tuning switch circuit 800 at different positions of the gap can be determined according to the preset resonant frequency points of various preset radio frequency signals and the size of the antenna radiator required for transmitting the preset radio frequency signals.

For example, as shown in fig. 3, a tuning switch circuit C1 is connected in series at the position of the first broken seam DF1, a first feed KY1 is connected to a conductive frame between the first broken seam DF1 and the second broken seam DF2, a first feed current provided by the first feed KY1 flows from a first feed point a to NFC _ N in the counterclockwise direction, and the conductive frame 200 between a and NFC _ N acts on transmission of the first feed current, so as to realize radiation of a first preset radio frequency signal corresponding to the first feed current. And a second feed source KY2 is connected to the conductive frame between the second broken joint DF2 and the third broken joint DF 3. If the antenna radiator size required by the second preset radio frequency signal corresponding to the second feed current is the length between b and C, a tuning switch circuit C2 may be set, where the tuning switch circuit C2 is in a high-impedance state at the preset resonant frequency point of the second preset radio frequency signal, and does not allow the second feed current to pass through.

If the size of the antenna radiator required by the second preset radio frequency signal is the length from b to e, configuring a tuning switch circuit C2, wherein the tuning switch circuit C2 is in a low-resistance state at a preset resonance frequency point of the second preset radio frequency signal, and the second feed current is transmitted from b along the counterclockwise direction and transmitted to e through the tuning switch circuit C2. The conductive frame 200 between b and e acts on the radiation of the second preset radio frequency signal by configuring the tuning switch circuit C1 to be in a high impedance state at the preset resonance frequency point of the second preset radio frequency signal.

In the embodiment of the present application, a high-frequency short-circuit filter circuit, for example, a high-frequency short-circuit capacitor, may be connected in series between each feed source and its corresponding feed point. The feed current provided by the feed source can be fed into the conductive frame 200, and the interference between the feed current and the excitation current can be avoided. The high-frequency short-circuit filter circuit is a filter circuit which can allow a feed current provided by a feed source to pass through and does not allow an excitation current to pass through. The parameter selection of the filter circuit can be determined according to the feed current parameter provided by the feed source.

In an embodiment of the application, the electronic device may further include a non-near-field communication unit, and the preset radio frequency signal is provided based on the non-near-field communication unit. The non-near-field communication unit may be an IC, which may be integrated on a circuit board of the electronic device. The non-near-field communication unit may be a chip matched thereto based on the type of the preset radio frequency signal. The non-near-field communication unit may be a cellular communication chip, for example corresponding to a cellular network signal, for providing the cellular network signal. When the predetermined radio frequency signal is a GPS signal, the non-near-field communication unit may be a GPS chip. When the predetermined rf signal is a WiFi signal, the non-near-field communication unit may be a WiFi chip. When the preset radio frequency signal is a BT signal, the non-near-field communication unit may be a BT chip.

The conductive frame 200 may be used for radiation of the preset radio frequency signal at the preset resonance frequency point, for example, a WiFi signal working at a 5GHz frequency band, for example, a WiFi signal at a 2.4GHz frequency band.

In the embodiment of the present application, the antenna coil 600 and the conductive frame 200 are connected by a spring to transmit an excitation current together. In the electronic device shown in fig. 1-3, each connection point of the antenna coil 600 and the conductive bezel 200 can be connected through a spring. The connection of the nfc unit 400 to the antenna coil 600 or the conductive bezel 200 may also be implemented by a spring.

In order to ensure the effectiveness of the gap setting, the transmission path of the NFC signal on the conductive frame 200 can be disconnected, in this embodiment of the application, the gap of the gap is greater than a first distance, and the first distance is a distance between the elastic piece connected to the first free end of the gap position and the elastic piece connected to the second free end. Namely, the gap of the broken joint is larger than the distance between two adjacent elastic sheets, so that the coupling of NFC signals on the two adjacent elastic sheets caused by the undersize of the broken joint is avoided.

In the embodiment of the present application, the electrical connection between the parts may also be realized by means of a conductor, a flexible circuit board, or the like.

In the embodiment of the present application, as shown in fig. 4 and 5, the electronic device further includes: and (5) a middle frame. The middle frame includes a conductive frame 200 and a middle plate, and the antenna coil 600 is disposed in a middle region of the middle plate. At the moment, the distribution uniformity of the NFC signals is better, and the coupling between the positions of the electronic equipment and the radio frequency fields of other equipment is facilitated when a user uses the electronic equipment. The position of the broken seam may be set at any position of the conductive frame 200, for example, the position shown in fig. 4 and 5 may be determined based on the space arrangement requirement of other modules mounted on the electronic device. For example, the key can be arranged at a position which can ensure the stability of the middle frame and does not influence the space arrangement requirement of the keys on the electronic equipment such as a watch and the like. The shape of the conductive frame 200 may be designed to be rectangular, circular, etc., and is specifically determined according to the overall structural design of the electronic device, without limitation. It should be understood that, in fig. 3 and 5, NFC _ P and NFC _ N are connected to a near field communication unit not shown. As shown in fig. 4 and 5, the conductive bezel 200 may be disposed at a side of the middle frame. For small-sized electronic equipment, the conductive frame 200 and the antenna coil 600 are arranged close to each other, and the effect of mutual enhancement of magnetic fields is better.

In the embodiment of the present application, the position of the broken seam may be filled with a plastic material having a color consistent with that of the conductive frame 200, which is beneficial to improving the aesthetic appearance of the electronic device. The tuning switch circuit can be packaged in the plastic material, so that the stability of connection between the tuning switch circuit 800 and the conductive frame 200 is facilitated, and the arrangement space on the middle frame of the electronic equipment can be saved.

In the embodiment of the present application, one side of the middle plate is made of metal to form a metal area, and when other electronic components on the electronic device transmit alternating current, the metal area may generate a high-frequency interference signal to interfere with the excitation current. Based on this, the electronic device further includes a filter circuit (not shown). The filter circuit is used for electrically connecting the metal area and the ground, and due to the characteristic that the filter circuit is high-frequency resistant and low-frequency resistant, high-frequency interference signals are filtered, the transmission of NFC low-frequency signals is not influenced, and the communication performance of the electronic equipment is further improved. The filter circuit may include capacitors, inductors, combinations thereof, and the like.

In this embodiment of the application, the electronic device may be a smart phone, a tablet computer, or other devices, and may also be a game device, an Augmented Reality (AR) device, an automobile device, a data storage device, an audio playing device, a video playing device, a notebook computer, a desktop computing device, or other devices.

In an embodiment of the present application, the electronic device may be embodied as a wearable device. Wearable devices include, but are not limited to, smart watches, smart bracelets, and the like. For example, a smart watch with a call function, a smart watch and a sports watch without a call function, and a bracelet with an NFC function, etc. The wearable device provided by the embodiment of the application is based on the setting of the tuning switch circuit 800 and the fracture setting on the conductive frame 200, the NFC communication performance is improved under the condition that the size of the device is not increased, and the wearable device is compatible with communication of preset radio frequency signals such as LTE signals, GPS signals, wiFi signals and BT signals.

In the embodiment of the present application, the length of the conductive bezel 200 for radiating the predetermined radio frequency signal is less than a quarter of the sum of the lengths of the conductive bezel 200 for radiating the NFC signal and the antenna coil 600.

In order to better help those skilled in the art to understand the implementation process of the embodiment of the present application, an example is described herein when the electronic device is a smart watch and the application scenario is a subway passing brake, but it should be emphasized that the example herein does not limit the actual protection scope of the present application.

As shown in fig. 6, the relationship between the magnetic field strength and the distance X (mm) from the center point is shown for a large-sized coil test example. As can be seen, the magnetic field strength at the center point of a large coil such as a gate of a subway train is weak, which results in the weakest coupling performance between the watch and the gate at the center point. Traditional wearable equipment adopts full conductive frame 200, and this conductive frame 200 top can form reverse current and subtract the magnetic field of NFC signal, further attenuates the NFC signal that the wrist-watch received from the floodgate machine. As shown in table 1, in one example, the coupling coefficient between the watch and the gate decayed by approximately 2/3 when the bezel of the watch was the conductive bezel 200. Therefore, when the watch swipes the card at the center of the subway gate, the gate signal can not be received, so that the card swiping failure is caused, and the card swiping success rate and the user experience are influenced.

TABLE 1

Center point of gate	Coefficient of coupling
		Non-conductive frame	0.043
Plastic conductive frame	0.042
		Conductive frame	0.016

Through the structure of the electronic device as shown in fig. 1-3, the part of the conductive frame 200, which originally weakens the NFC signal, converted into the enhanced signal can improve the signal received when the card is swiped in the center of the subway gate, and improve the success rate of swiping the card. And through establish ties a capacitance of 30pF in the position of electrically conductive frame 200 break joint, electrically conductive frame 200 is still disconnected for the NFC signal of 13.56MHz, and for other higher frequency predetermine radio frequency signal, the capacitance of 30pF is equivalent to the short circuit, and the size of the antenna radiator that is used for transmitting predetermine radio frequency signal can be equivalent to complete closed electrically conductive frame 200.

Lid behind wearable equipment's back lid often is the metal, and in this application embodiment, wearable equipment still includes the display screen, and for the near field communication of better realization wearable equipment, above-mentioned antenna coil 600 can set up between display screen and backstage, for example, can paste and establish on the non-display surface of display screen. On the one hand, be favorable to improving wearable equipment's the degree of integrating, reduce wearable equipment's volume. On the other hand, when using wearable equipment to carry out NFC communication with other equipment, avoid the influence of lid to NFC communication performance behind the metal. As described in the above embodiments, the metal region of the metal rear cover may be grounded through the filter circuit to avoid the influence of the high-frequency interference signal on the NFC signal, thereby improving the NFC communication performance. The electronic device has a circuit board, the ground may be mainly disposed on the surface of the circuit board, and the circuit board is further provided with electrical connection devices such as spring pins, screws, spring pieces, conductive cloth, conductive foam or conductive glue, etc., for establishing connection between the antenna coil 600, the conductive frame 200 and the near field communication unit 400, or for establishing connection between the ground and the filter circuit. In addition, air, plastic, ceramic or other dielectric materials can be filled between the ground and the connected components.

In embodiments of the present application, the wearable device may also include other types of components, such as one or more of the following may be provided: power key, volume key, battery and camera.

In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (11)

1. An electronic device, comprising:

the conductive frame is provided with a broken seam, and a first free end and a second free end of the conductive frame are formed at the position of the broken seam;

a near field communication unit for providing an excitation current;

the antenna coil is connected with the conductive frame and then used for transmitting the excitation current together;

the tuning switch circuit is connected between the first free end and the second free end of the broken joint position in series;

the tuning switch circuit is used for blocking the excitation current at a working frequency point of the near field communication unit and transmitting a feed current at a preset resonant frequency point; the feeding current is used for exciting the conductive frame to radiate a preset radio frequency signal, and the preset resonant frequency point is higher than the working frequency point.

2. The electronic device of claim 1,

the first end of the antenna coil is connected with the first free end of the broken joint position;

a first signal end of the near field communication unit is connected with a second free end of the broken seam position, and a second signal end of the near field communication unit is connected with a second end of the antenna coil;

the excitation current is fed to the conductive frame through the second free end and flows back to the near field communication unit through the second end of the antenna coil.

3. The electronic device of claim 1, wherein the seam comprises at least a first seam and a second seam;

the first end of the antenna coil is connected with the first free end of the first broken joint position, and the second end of the antenna coil is connected with the second free end of the first broken joint position;

a first free end of the second broken joint position is connected with a first signal end of the near field communication unit, and a second free end of the second broken joint position is connected with a second signal end of the near field communication unit;

and the excitation current is fed into the conductive frame through the first free end of the second broken joint position and flows back to the near field communication unit through the second free end of the second broken joint position.

4. The electronic device of claim 3, wherein the break further comprises at least one third break, and wherein one of the tuned switch circuits is connected in series between the first free end and the second free end of each third break.

5. The electronic device of any of claims 1-4, wherein one of the tuned switch circuits is connected in series between the first free end and the second free end of each of the fracture locations.

6. The electronic device of claim 1, the tuning switch circuit comprising:

and the capacitor is connected between the first free end and the second free end of the broken joint position in series.

7. The electronic device of claim 1, wherein a feeding point is further disposed on the conductive frame, and the electronic device further comprises a feeding source for providing the feeding current, and the feeding current is fed to the conductive frame through the feeding point, so as to excite the conductive frame to radiate the preset radio frequency signal.

8. The electronic device of claim 1, further comprising:

the middle frame comprises the conductive frame and a middle plate, and the antenna coil is arranged in the middle area of the middle plate.

9. The electronic device of claim 1, wherein the electronic device is a wearable device.

10. The electronic device of claim 1, wherein the antenna coil and the conductive frame are connected by a spring plate and then transmit the excitation current together.

11. The electronic device of claim 10, wherein a gap of the break is greater than a first distance, and the first distance is a distance between a spring plate connected to the first free end and a spring plate connected to the second free end of the break.

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