CN117937099A

CN117937099A - Electronic equipment

Info

Publication number: CN117937099A
Application number: CN202211260236.XA
Authority: CN
Inventors: 张云帆; 廖巧亮; 吴小浦
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2024-04-26

Abstract

The application discloses an electronic device, on the one hand, a first antenna unit and a second antenna unit in an antenna assembly in the electronic device are coupled through a gap to form a common-caliber antenna, and the common body with an NFE antenna is realized through loop inductance; on the other hand, through the width of the radiator of the second earthing terminal back earth side that the rational design second antenna element includes, both guaranteed antenna assembly's performance, still increased NFC antenna's current path length to NFC card reading performance has been promoted greatly.

Description

Electronic equipment

Technical Field

The present application relates to, but is not limited to, communication technology, and in particular, to an electronic device.

Background

With the development of technology, electronic devices such as mobile phones with communication functions have become more and more popular and more powerful. An antenna assembly is typically included in an electronic device to enable communication functions of the electronic device. However, the communication performance of the antenna assembly in the electronic device in the related art is not good enough, and there is room for improvement.

Disclosure of Invention

The application provides electronic equipment, which can realize the integration of NFC antennas, ensure the performance of cellular antennas and greatly improve the card reading performance of NFC.

An embodiment of the present application provides an electronic device, including: antenna assembly, loop inductance, and near field communication NFC chip; the antenna assembly comprises a first antenna unit and a second antenna unit; wherein,

The first antenna unit comprises a first radiator and a first feed source, the first radiator comprises a first grounding end and a first free end, and the first radiator is provided with a first feed point; the first feed source and the first radiator are electrically connected to the first feed point and used for exciting the first radiator to resonate in a first frequency band;

The second antenna unit comprises a second radiator and a feed source, and the second radiator comprises a second grounding end and a second free end; the second free end and the first free end are arranged at intervals to form a gap, and the first radiator and the second radiator are coupled through the gap; the feed source is electrically connected with the second radiator and is used for exciting the second radiator to resonate in a corresponding frequency band;

The first radiator comprises a first grounding end and a first free end, and the second radiator comprises a second grounding end and a second free end; the first free end and the second free end are arranged at intervals to form a gap, and the first radiator and the second radiator are coupled through the gap;

The port of the first differential signal of the NFC chip is connected to the first grounding end, the port of the second differential signal of the NFC chip is connected to the second grounding end, and the NFC chip is used for providing differential exciting current; a conductive path formed by a radiator part between the first grounding end and the second grounding end, and used for transmitting differential excitation current generated by the NFC chip;

The loop inductor is electrically connected between the first feed point and a connection point where the feed source is electrically connected with the second radiator, and the loop inductor is used for connecting the first radiator and the second radiator to form a current path of the NFC antenna;

The second grounding end is grounded through a connecting piece, and the width of the connecting piece in the direction parallel to the second radiator is smaller than a preset width so as to increase the current path length of the NFC antenna.

According to the electronic equipment provided by the embodiment of the application, on one hand, the first antenna unit and the second antenna unit in the antenna assembly in the electronic equipment are coupled through the gap to form the common-caliber antenna, and the common body with the NFC antenna is realized through the loop inductance; on the other hand, through the width of the radiator of the second earthing terminal back earth side that the rational design second antenna element includes, both guaranteed antenna assembly's performance, still increased NFC antenna's current path length to NFC card reading performance has been promoted greatly.

In one illustrative example, the electronic device of the present application further comprises: and a band-pass circuit for allowing part of the high-frequency current to pass through the band-pass circuit 141 itself back to ground to ensure the performance of the corresponding antenna of the third frequency band. A large inductor in the band-pass circuit presents high resistance to high-frequency current, and a large capacitor in the band-pass circuit is used for isolating low-frequency current of the NFC antenna, so that the antenna performance of the antenna corresponding to a feed source electrically connected with the loop inductor in the second antenna unit is better ensured.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.

Fig. 1 is a schematic structural diagram of an electronic device 1000 according to an embodiment of the present application;

FIG. 2 is an exploded schematic view of the electronic device provided in FIG. 1;

Fig. 3 is a schematic structural diagram of a first embodiment of an electronic device according to an embodiment of the present application;

Fig. 4 is a schematic structural diagram of a second embodiment of an electronic device according to an embodiment of the present application;

Fig. 5 is a schematic structural diagram of a third embodiment of an electronic device according to an embodiment of the present application;

Fig. 6 is a schematic structural diagram of a fourth embodiment of an electronic device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a fifth embodiment of an electronic device according to an embodiment of the present application;

FIG. 8 is a graph of S-parameters of a first antenna in an electronic device according to an embodiment of the present application;

FIG. 9 is a graph of S-parameters of a second antenna in an electronic device according to an embodiment of the present application;

fig. 10 (a) is a schematic diagram of a mode 1 principle of third antenna excitation in the electronic device according to the embodiment of the present application;

fig. 10 (b) is a schematic diagram of a mode 2 principle of third antenna excitation in the electronic device according to the embodiment of the present application;

fig. 10 (c) is a schematic diagram of a mode 3 principle of third antenna excitation in the electronic device according to the embodiment of the present application;

fig. 10 (d) is a schematic diagram of a mode 4 principle of third antenna excitation in the electronic device according to the embodiment of the present application;

fig. 10 (e) is a schematic diagram of a mode 5 principle of third antenna excitation in the electronic device according to the embodiment of the present application;

fig. 10 (f) is a schematic diagram of a mode 6 principle of third antenna excitation in the electronic device according to the embodiment of the present application;

FIG. 10 (g) is a schematic diagram of a third antenna excited mode 7 in an electronic device according to an embodiment of the present application;

fig. 10 (h) is a schematic diagram of a mode 8 principle of third antenna excitation in the electronic device according to the embodiment of the present application;

FIG. 11 is a graph showing S-parameters of a third antenna according to an embodiment of the present application;

FIG. 12 is a graph illustrating an efficiency of an antenna included in an antenna assembly of an electronic device according to an embodiment of the present application;

Fig. 13 is another efficiency graph of an antenna included in an antenna assembly of an electronic device according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.

In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It is to be understood that the terms "first," "second," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.

As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.

The present application provides an electronic device, which includes but is not limited to an electronic device having a communication function such as a mobile phone, a network device (mobile INTERNET DEVICE, MID), an electronic book, a portable player station (Play Station Portable, PSP), or a Personal digital assistant (Personal DIGITAL ASSISTANT, PDA).

Fig. 1 is a schematic structural diagram of an electronic device 1000 according to an embodiment of the present application. The electronic device 1000 may be a device capable of receiving and transmitting electromagnetic wave signals, such as a phone, a television, a tablet computer, a mobile phone, a camera, a personal computer, a notebook computer, an on-board device, an earphone, a watch, a wearable device, a base station, an on-board radar, a customer premise equipment (CPE, customer Premise Equipment), or the like. Taking the electronic device 1000 as a mobile phone for example, for convenience of description, the width direction of the electronic device 1000 is defined as the X direction, the length direction of the electronic device 1000 is defined as the Y direction, and the thickness direction of the electronic device 1000 is defined as the Z direction, which are defined with reference to the electronic device 1000 being at the first viewing angle. The direction indicated by the arrow is forward. The electronic device 1000 comprises a first side 401 and a second side 402 arranged opposite to each other, and a third side 403 and a fourth side 404 connected between the first side 401 and the second side 402. Wherein the first side 401, the third side 403 are a pair of long sides in the Y direction, and the second side 402 and the fourth side 404 are a pair of short sides in the X direction. In fig. 1, electronic device 1000 is illustrated as a rectangle, and in other embodiments, electronic device 1000 may have a trapezoid, diamond, or other shape.

Fig. 2 is an exploded schematic view of the electronic device provided in fig. 1, and in combination with fig. 1 and fig. 2, an electronic device 1000 provided in an embodiment of the application includes a display screen 300 and a housing 500 covered with the display screen 300. The housing 500 includes a middle frame 501 and a rear cover 502 that are mutually covered. The rear cover 502 is located on the side of the middle frame 501 facing away from the display screen 300. The middle frame 501 includes a middle plate and a frame surrounding the middle plate. The middle board is used for mounting electronic components such as the main board 200, the battery 400 and the like. The edge, bezel and back cover 502 of the display 300 are connected in sequence. The frame and the rear cover 502 may be integrally formed. The electronic device 1000 further comprises an antenna assembly 10. At least part of the antenna assembly 10 is disposed on the motherboard 200 of the electronic device 1000 or electrically connected to the motherboard 200 of the electronic device 1000. The antenna assembly 10 is used for receiving and transmitting radio frequency signals to realize the communication function of the electronic device 1000. It should be noted that, the setting position of the antenna assembly 10 in fig. 2 is merely an example of illustration, and is not intended to limit the setting position of the antenna assembly in the electronic device provided by the embodiment of the present application, but is not intended to limit the protection scope of the present application.

Fig. 3 is a schematic structural diagram of a first embodiment of an electronic device according to an embodiment of the present application, and as shown in fig. 3, an electronic device 1000 in the first embodiment may include: an antenna assembly 10, a loop inductance L12, and a Near Field Communication (NFC) chip 131; the antenna assembly 10 includes a first antenna element 110, a second antenna element 120; wherein,

The first antenna unit 110 includes a first radiator 111 and a first feed source 11, the first radiator 111 includes a first ground 1111 (as shown in fig. 3, the first ground 1111 is connected to a first ground GND 1) and a first free end 1112, and the first radiator 111 has a first feed point a; the first feed source 11 and the first radiator 111 are electrically connected to a first feed point a, and are used for exciting the first radiator 111 to resonate in a first frequency band;

The second antenna unit 120 includes a second radiator 121 and a feed, where the second radiator 121 includes a second ground end 1211 (the second ground end 1211 is connected to a second ground GND2 as shown in fig. 3) and a second free end 1212; the second free end 1212 is spaced from the first free end 1112 to form a gap 1122, and the first radiator 111 and the second radiator 121 are coupled through the gap 1122; the feed source is electrically connected with the second radiator 121 and is used for exciting the second radiator 121 to resonate in a corresponding frequency band;

The port of the first differential signal of the NFC chip 131 is connected to the first ground 1111, the port of the second differential signal of the NFC chip 131 is connected to the second ground 1211, and the NFC chip 131 is used for providing a differential exciting current; a conductive path formed by the radiator part between the first ground terminal and the second ground terminal, for transmitting a differential exciting current generated by the NFC chip 131;

The loop inductance L12 is electrically connected between the first feeding point a and a connection point where the feed source is electrically connected with the second radiator 121, and the loop inductance L12 is used for connecting the first radiator 111 and the second radiator 121 to form a current path of the NFC antenna;

The second grounding terminal 1211 is grounded through a connection member 121121 (shown as a hatched portion in fig. 1), which has a width in a direction parallel to the second radiator 121 that is not greater than a predetermined width, so as to increase the current path length of the NFC antenna.

In an exemplary embodiment, the setting of the preset width may be determined according to an actual application scenario, so long as interference of other cellular antennas disposed adjacent to the second antenna unit 120 on each antenna in the antenna assembly 10 in the electronic device according to the embodiment of the present application is avoided, performance of each antenna in the antenna assembly 10 is ensured, and meanwhile, current path length of the NFC antenna can be increased to improve NFC card reading performance.

The performance of the NFC antenna is related to the effective radiator length thereof, and since the width of the connecting piece 121121 (shown as a hatched portion in fig. 1) of the second grounding end 1211 of the second antenna unit 120, which is grounded, is smaller than the preset width (may be, for example, 2mm in one embodiment), that is, the second grounding end 1211 is grounded with a small rib, the effective radiator length of the NFC antenna is effectively increased, so that the current path length of the NFC antenna is increased, a sufficient NFC card reading distance is ensured, and the NFC card reading performance is improved.

In the electronic device provided in the embodiment of the present application, on the one hand, the gap coupling 1122 is adopted between the first antenna unit and the second antenna unit in the antenna assembly of the electronic device, so that not only the first radiator 111 but also the second radiator 121 can be utilized when the first antenna unit 110 works, so that the first antenna unit 110 can support the first frequency band, and therefore, the antenna assembly 10 has a better communication effect. Accordingly, the second antenna unit 120 may be operated using not only the second radiator 121 but also the first radiator 111. In other words, the first antenna unit 110 and the second antenna unit 120 are common aperture antennas; on the other hand, connection with the NFC chip is realized through the loop inductance L12, an NFC current path is formed, and the NFC antenna is integrated; in another aspect, by reasonably designing the width of the connecting piece 121121 (as shown in a hatched portion in fig. 1) of the second grounding terminal 1211 of the second antenna unit 120, the performance of the antenna assembly is ensured, and the current path length of the NFC antenna is increased, so that the performance of NFC card reading is greatly improved.

In an illustrative example, in the first embodiment shown in fig. 3, the feeds included in the second antenna unit 120 may include the second feed 12, and the corresponding frequency band includes the second frequency band; the second radiator 121 has a second feeding point B, and the second feed 12 and the second radiator 121 are electrically connected to the second feeding point B, so as to excite the second radiator 121 to resonate in a second frequency band. In this case, the loop inductance L12 is electrically connected between the first feeding point a and the second feeding point B. In one embodiment, the first frequency band may include, but is not limited to, e.g., a GPS frequency band, a WIFI 2.4G frequency band; the second frequency Band may include a Low frequency (LB) Band.

In an illustrative example, in the second embodiment shown in fig. 4, the feeds included in the second antenna unit 120 may include a second feed 12 and a third feed 13, and the corresponding frequency bands include a second frequency band and a third frequency band; the second radiator 121 has a second feeding point B and a third feeding point C, and the second feed 12 and the second radiator 121 are electrically connected to the second feeding point B, so as to excite the second radiator 121 to resonate in a second frequency band; the third feed 13 and the second radiator 121 are electrically connected to a third feeding point C, and are used for exciting the second radiator 121 to resonate in a third frequency band, and a distance between the third feeding point C and the second free end 1212 is smaller than a distance between the second feeding point B and the second free end 1212. In this case, the loop inductance L12 is electrically connected between the first feeding point a and the third feeding point C. In one embodiment, the first frequency band may include, but is not limited to, e.g., a GPS frequency band, a WIFI 2.4G frequency band; the second frequency band may include an LB frequency band; the third frequency Band may include, but is not limited to, for example, an Ultra High Band (UHB) frequency Band and an Ultra Wide Band (UWB) frequency Band.

It should be noted that the UHB frequency range is 3000MHz-6000MHz, and the GPS frequency range may include, for example, GPS-L1 frequency range, GPS-L5 frequency range, and the like, and the LB frequency range is lower than 1000MHz. The LB frequency band may include electromagnetic wave signals of all low frequency bands such as 4G (also referred to as LTE-LB) and 5G (also referred to as NR-LB), among others.

In an exemplary embodiment, loop inductance L12 is a large inductance such that the NFC antenna does not affect the performance of first antenna element 110 and second antenna element 120. In one embodiment, the value of loop inductance L12 is not less than 10nH.

In an illustrative example, in a third embodiment shown in fig. 5, the electronic device provided in the embodiment of the present application may further include a band-pass circuit 141; the band pass circuit 141 is used to allow part of the high frequency current to pass through the band pass circuit 141 itself back to ground to ensure the performance of the antenna of the corresponding third feed 13 in the antenna assembly 10. As shown in fig. 5, one end of the band-pass circuit 141 and the second radiator 121 are electrically connected to the fourth connection point D, and the other end of the band-pass circuit 141 is connected to the third ground GND3; the distance between the fourth connection point D and the second free end 1212 is greater than the distance between the second feeding point B and the second free end 1212. In one embodiment, the high frequency current fed by the third feed 13 to the second radiator 121 includes a first current component that is returned from the connection 121121 to ground and a second current component that is returned from the bandpass circuit 141, where the second current component is less than the first current component. In this embodiment, a small portion of the high current is allowed to pass back through the bandpass circuit 141 to ground, thereby better compensating for the high frequency offset due to the longer high frequency current path.

In one embodiment, the band-pass circuit 141 includes a first capacitor C1 and a first inductor L1 connected in series, wherein the first inductor L1 is a large inductor, and presents a high resistance to high-frequency current such as N78/WIFI/UWB, i.e. allows a small portion of the high-frequency current to pass through the band-pass circuit 141 back to ground; the first capacitor C1 may be a large capacitor for isolating the low frequency current of the NFC antenna. In this way, the performance of the antenna in the second antenna element 120 corresponding to the feed electrically connected to the loop inductance L12 is better ensured. Taking the third embodiment shown in fig. 5 as an example, the performance of the antenna corresponding to the third feed 13 in the second antenna unit 120 is better ensured. Moreover, the bandpass circuit 141 is added to return to the ground, so that the high-frequency current return position of the antenna corresponding to the third feed 13 in the antenna assembly 10 is still the return ground rib position of the second ground end 1211 of the second antenna unit 120, thereby ensuring the efficiency of the antenna corresponding to the first feed 11, the antenna corresponding to the second feed 12 and the antenna corresponding to the third feed 13 in the antenna assembly 10.

In an illustrative example, as shown in fig. 6, the electronic device provided by the embodiment of the present application may further include:

In one embodiment, one end of the first radiator 111 away from the slot 1122 is a first ground G1, and the first isolation capacitor C11 is electrically connected between the first ground G1 and the first ground GND 1.

And/or the number of the groups of groups,

The second isolation capacitor C22, the second isolation capacitor C22 is electrically connected between the second radiator 121 and the second ground GND2, and the second isolation capacitor C22 is used for isolating the NFC current. In one embodiment, the end of the second radiator 121 away from the slit 1122 is a second ground G2, and the second isolation capacitor C22 is electrically connected between the second ground G2 and the second ground GND 2.

Fig. 5 is only an illustration of the electronic device according to the third embodiment shown in fig. 4, but is not intended to limit the scope of the present application. For example, the electronic device according to the second embodiment shown in fig. 3 or the electronic device according to the first embodiment shown in fig. 2 may further include a first isolation capacitor C11 and/or a second isolation capacitor C22.

In one embodiment, the value of the first isolation capacitor C11 is 100pF. In one embodiment, the value of the second isolation capacitance C22 is 100pF.

In an exemplary embodiment, the electronic device provided by the embodiment of the present application may further include any combination of the following:

The first antenna element 110 further comprises: a first matching circuit M1 provided between the first feed point a and the first feed source 11. The first feed source 11 is configured to generate an excitation signal (also referred to as a radio frequency signal), and the first matching circuit M1 is configured to filter clutter of the excitation signal (also referred to as a radio frequency signal) transmitted by the first feed source 11, form a first radio frequency signal of a first frequency band, and transmit the first radio frequency signal to the first radiator 111, so as to excite the first radiator 111 to resonate in the first frequency band;

The second antenna unit 120 further includes: and a second matching circuit M2 disposed between the second feed point B and the second feed source 12. The second feed source 12 is used for generating an excitation signal, the second matching circuit M2 is used for filtering clutter of the excitation signal transmitted by the second feed source 12 to form a second radio frequency signal of a second frequency band, and transmitting the second radio frequency signal to the second radiator 121 to excite the second radiator 121 to resonate in the second frequency band;

The second antenna unit 120 further includes: and a third matching circuit M3 disposed between the third feed point C and the third feed source 13. The third feed source 13 is configured to generate an excitation signal, and the third matching circuit M3 is configured to filter clutter of the excitation signal transmitted by the third feed source 13, form a third radio frequency signal in a third frequency band, and transmit the third radio frequency signal to the second radiator 121, so as to excite the second radiator 121 to resonate in the third frequency band.

In an illustrative example, in the case where the electronic device in the embodiment of the present application includes the first matching circuit M1 and the second matching circuit M2, the loop inductance L12 is electrically connected between the first feeding point a at which the first matching circuit M1 is connected to the first radiator 111, and the second feeding point B at which the second matching circuit M2 is connected to the second radiator 121.

In an illustrative example, for the case where the electronic device in the embodiment of the present application includes the first matching circuit M1, the second matching circuit M2, and the third matching circuit M3, the loop inductance L12 is electrically connected between the first feeding point a at which the first matching circuit M1 is connected to the first radiator 111, and the third feeding point C at which the third matching circuit M3 is connected to the second radiator 121.

The matching circuits in the embodiment of the present application, such as the first matching circuit M1, the second matching circuit M2, and the third matching circuit M3, may include, but are not limited to, a frequency-selective filter network including capacitors, inductors, resistors, etc. arranged in series and/or in parallel, and the matching circuit may include a plurality of branches formed by capacitors, inductors, resistors connected in series and/or in parallel, and a switch for controlling the on/off of the plurality of branches. The frequency selection parameters (such as resistance value, inductance value and capacitance value) of the matching circuit can be adjusted by controlling the on-off of different switches, so that the filtering range of the matching circuit is adjusted, the matching circuit can acquire radio frequency signals from excitation signals transmitted by a feed source connected with the matching circuit, and the antenna can transmit electromagnetic wave signals of the radio frequency signals. The different matching circuits may be different, and the specific circuit implementation is not intended to limit the scope of the present application. In one embodiment, the matching circuit in the embodiment of the present application may also include adjustable devices such as switches, variable capacitors, and the like. The matching circuit is used for adjusting the impedance of the radiator electrically connected with the matching circuit, so that the impedance of the radiator electrically connected with the matching circuit is matched with the frequency at which the radiator resonates, and further, the receiving and transmitting power of the radiator is higher, and therefore, the matching circuit is also called a frequency modulation circuit. By setting the frequency modulation circuit and adjusting the parameters of the frequency modulation circuit, the resonant frequency of each antenna can be moved along the low frequency or the high frequency, the ultra-wideband of the antenna assembly 10 is realized, and the coverage and the communication quality of the antenna signals of the antenna assembly 10 are increased. In one illustrative example, the first radiator 111 is a flexible circuit board (FPC, flexible Printed Circuit) antenna radiator, or is a laser direct Structuring (LDS, laser Direct) antenna radiator, or is a printed direct Structuring (PDS, print Direct) antenna radiator, or is a metal stub. In one illustrative example, the second radiator 121 is an FPC antenna radiator or an LDS antenna radiator, or a PDS antenna radiator, or a metal stub. In one embodiment, the type of first radiator 111 is the same as the type of second radiator 121. In one embodiment, the type of the first radiator 111 may be different from the type of the second radiator 121.

In an exemplary embodiment, at the ground end of the radiator, a tuning circuit may be further included, such as: a first tuning circuit T1 (not shown in the figures) may also be connected in series between the first radiator 111 and the first ground GND 1; and the following steps: a second tuning circuit T2 (not shown in the figure) may also be connected in series between the second radiator 121 and the second ground GND 2. The tuning circuits in the embodiments of the present application, such as the first tuning circuit T1 and the second tuning circuit T2, may include, but not limited to, a frequency-selective filter network including a capacitor, an inductor, a resistor, etc. arranged in series and/or in parallel, and the matching circuit may include a plurality of branches formed by the capacitor, the inductor, the resistor, etc. connected in series and/or in parallel, and a switch for controlling the on/off of the plurality of branches.

Fig. 7 is a schematic structural diagram of a fifth embodiment of an electronic device according to an embodiment of the present application, and as shown in fig. 7, an electronic device 1000 includes: a first side 401, a second side 402, a third side 403, and a fourth side 404 connected in sequence, wherein the first side 401 is opposite to the third side 403, and the second side 402 is opposite to the fourth side 404; the electronic device 1000 further includes: antenna assembly 10, loop inductance L12, bandpass circuit 141, and NFC chip 131; the antenna assembly 10 includes a first antenna element 110, a second antenna element 120; wherein,

The first antenna unit 110 comprises a first radiator 111 and a first feed source 11, and the first antenna unit 110 is partially arranged on a first side 401 and the other part is arranged on a fourth side 404; the first radiator 111 has a first feeding point a; the first feed source 11 is electrically connected to the first feed point a through the first matching circuit M1 and the first radiator 111, and is used for exciting the first radiator 111 to resonate in the first frequency band;

The second antenna unit 120 comprises a second radiator 121, a second feed source 12 and a third feed source 13, and the second antenna unit 120 is arranged on the fourth side 404; the second radiator 121 has a second feeding point B and a third feeding point C, and the second feed 12 is electrically connected to the second feeding point B through the second matching circuit M2 and the second radiator 121, so as to excite the second radiator 121 to resonate in a second frequency band; the third feed source 13 is electrically connected to the third feed point C through the third matching circuit M3 and the second radiator 121, and is used for exciting the second radiator 121 to resonate in a third frequency band; the distance between the third feeding point C and the second free end 1212 is smaller than the distance between the second feeding point B and the second free end 1212;

The first radiator 111 includes a first grounding end 1111 and a first free end 1112, wherein the first grounding end 1111 is disposed on the first side 401, and the first free end 1112 is disposed on the fourth side 404; the second radiator 121 includes a second ground end 1211 and a second free end 1212; the first free end 1112 is spaced from the second free end 1212 to form a gap 1122, and the first radiator 111 and the second radiator 121 are coupled through the gap 1122; the first ground 1111 is connected to the first ground GND1, and the second ground 1211 is connected to the second ground GND2;

A bandpass circuit 141 for allowing part of the high-frequency current to pass through the bandpass circuit 141 and return to ground itself to ensure the performance of the antenna corresponding to the third feed 13 in the antenna assembly 10, one end of the bandpass circuit 141 and the second radiator 121 are electrically connected to the fourth connection point D, and the other end of the bandpass circuit 141 is connected to the third ground GND3; the distance between the fourth connection point D and the second free end 1212 is greater than the distance between the second feeding point B and the second free end 1212; in this embodiment, the band-pass circuit 141 includes a first capacitor C1 and a first inductor L1 connected in series;

The port of the first differential signal of the NFC chip 131 is connected to the first connection point of the first ground 1111, the port of the second differential signal of the NFC chip 131 is connected to the second connection point of the second ground 1211, and the NFC chip 131 is configured to provide a differential exciting current; a conductive path formed by the radiator part between the first connection point and the second connection point, for transmitting a differential exciting current generated by the NFC chip 131;

A loop inductance L12 is electrically connected between the first feeding point a and the third feeding point C, the loop inductance L12 being used to connect the first radiator 111 and the second radiator 121 to constitute a current path of the NFC antenna;

the second grounding terminal 1211 is grounded through a connection member 121121 (shown as a hatched portion in fig. 7) having a width in a direction parallel to the second radiator 121 not greater than a predetermined width so as to increase the current path length of the NFC antenna.

In an illustrative example, taking the embodiment shown in fig. 7 as an example, the first antenna (Ant 1) (corresponding to the first feed source 11) operates in, for example, a GPS frequency band and a WIFI 2.4G frequency band, the second antenna (Ant 2) (corresponding to the second feed source 12) operates in an LB frequency band, and the third antenna (Ant 3) (corresponding to the third feed source 13) operates in, for example, a UHB frequency band and a UWB frequency band; the first isolation capacitor C11 is 100pF, and the second isolation capacitor C22 is 100pF, and is used for isolating NFC current; the first matching circuit M1 of Ant1 is connected to the third matching circuit M3 of Ant3 through a loop inductance L12 larger than, for example, 10nH to connect Ant1 and Ant12, constituting a current path of the NFC antenna.

In this embodiment, the length of the first antenna unit 110 corresponds to 1/4 wavelength of the GPS. The S-parameter graph of Ant1 is shown in fig. 8, and Ant1 mainly includes three modes, and the resonance frequency points are shown at triangular marks 1,2 and 3 in fig. 8, so that Ant1 can work in a GPS frequency band, a WIFI 2.4G frequency band, and the like.

In this embodiment, the length of the second antenna unit 120 corresponds to 1/8-1/4 wavelength of the LB band. The main mode of the excitation of Ant2 in LB frequency band, such as B3/N3 frequency band, etc., comprises the 1/4 wavelength mode from the second ground GND2 to the slot 1122, and the S parameter graph is shown in FIG. 9.

In this embodiment, the working principle of Ant3 is shown in fig. 10 (a) -10 (h), and the eight main modes from the excitation of Ant3 are shown as thick arrow lines in the figure. The 8 main modes of Ant3 cover LTE, NR UHB frequency bands, WIFI7G, UWB frequency bands. Referring to fig. 11, fig. 11 is a schematic diagram of a return loss curve of an electromagnetic wave signal of a third frequency band transmitted and/or received by Ant3 in the electronic device shown in fig. 7, where in fig. 11, the horizontal axis represents frequency and the unit is MHz; the vertical axis is Return Loss (RL) in dB. As shown in fig. 10 (a), mode 1 is a loop mode from an Ant2 feed to an Ant3 feed, which is generated due to the influence of a third matching circuit M3 and a second matching circuit M2, and is used for supporting the transmission and/or reception of electromagnetic wave signals of a first sub-band, and is labeled 1 in fig. 11 for convenience of illustration; as shown in fig. 10 (b), mode 2 is a loop mode from the Ant2 feed source to the Ant1 feed source, and is used for supporting the transmission and/or the reception of electromagnetic wave signals of a second sub-band, and is labeled as 2 in fig. 11 for convenience of illustration; as shown in fig. 10 (c), mode 3 is a 1/4 wavelength mode of the Ant1 feed to the slot 1122, for supporting transmission and/or reception of electromagnetic wave signals of the third sub-band, and is labeled 3 in fig. 11 for convenience of illustration; as shown in fig. 10 (d), the mode 4 is a 3/4 wavelength mode generated by the ground return current from the slot 1122 to the motherboard, and is used to support the transmission and/or reception of electromagnetic wave signals in the fourth sub-band, and is labeled 4 in fig. 11 for convenience of illustration; as shown in fig. 10 (e), mode 5 is mainly a 1/4 wavelength mode of the Ant3 feed to the slot 1122, for supporting transmission and/or reception of electromagnetic wave signals of a fifth sub-band, and is labeled 5 in fig. 11 for convenience of illustration; as shown in fig. 10 (f), mode 6 is a loop mode of the Ant3 feed to the second ground GND2 for supporting transmission and/or reception of electromagnetic wave signals of the sixth sub-band, denoted as 6 in fig. 11 for convenience of illustration; as shown in fig. 10 (g), the mode 7 is mainly a 3/4 wavelength mode of the slot 1122 to the first ground GND1 for supporting transmission and/or reception of electromagnetic wave signals of the seventh sub-band, and is denoted as 7 in fig. 11 for convenience of illustration; as shown in fig. 10 (h), the mode 8 is mainly a 5/4 wavelength mode from the first ground GND1 to the slit 1122 for supporting transmission and/or reception of electromagnetic wave signals of the eighth sub-band, and is denoted by 8 in fig. 11 for convenience of illustration. In one embodiment, as shown in fig. 11, eight main modes, i.e., modes 1-8, excited by Ant3 in the embodiment of the present application may cover UHB frequency bands, WIFI7G, UWB frequency bands, such as N78, WIFI7G, UWB CH5, and other frequency bands.

In one embodiment, the preset width may be 2mm, that is, in this embodiment, the width of the connection part 121121 (shown as a hatched portion in fig. 7) of the second ground terminal 1211 to ground may be less than 2mm, which clearly increases the current path length of the NFC antenna, and the NFC effective radiator is increased to be more than 10mm compared with the related art, and, in conjunction with the arrangement of fig. 7, ant1, ant2, ant3 is disposed at the upper right corner of the electronic device, and in this embodiment, other cellular antennas (not shown in fig. 7) are disposed at the left side of the second antenna unit 120, although in the width of the connection part 121121 (shown as a hatched portion in fig. 7) of the second ground terminal 1211 to ground may be less than 2mm, it can be seen from fig. 12 that the performance of Ant1, ant2 is guaranteed, further, since the band-pass circuit 141 is disposed in this embodiment, a small portion of the band-pass circuit 141 itself is better guaranteed for the performance of Ant 3. In the embodiment, since the effective radiation length of NFC is obviously increased (> 10 mm), the type-4 card reading performance is improved by 2mm through experiments, the average value of L1-Minimum Power (Minimum Power) test items in the Forum authentication is improved by 18%, and the NFC performance is greatly improved.

In another embodiment, if the bandpass circuit 141 in the embodiment shown in fig. 7 is removed, as shown in fig. 13, fig. 13 is another efficiency graph of the antenna included in the antenna assembly in the electronic device according to the embodiment of the application, and it can be seen from fig. 13 that the performance of Ant1, ant2, ant3 is also guaranteed. In the embodiment, since the effective radiation length of NFC is obviously increased (> 10 mm), the type-4 card reading performance is improved by 2mm through experiments, the average value of L1-MinimumPower test items in Forum authentication can still be improved by more than 15%, and the NFC performance is also greatly improved.

Although the embodiments of the present application are described above, the embodiments are only used for facilitating understanding of the present application, and are not intended to limit the present application. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is to be determined by the appended claims.

Claims

1. An electronic device, comprising: antenna assembly, loop inductance, and near field communication NFC chip; the antenna assembly comprises a first antenna unit and a second antenna unit; wherein,

The second grounding end is grounded through a connecting piece, and the width of the connecting piece in the direction parallel to the second radiator is not larger than a preset width so as to increase the current path length of the NFC antenna.

2. The electronic device of claim 1, wherein the feed comprises a second feed and a third feed, the respective frequency bands comprising a second frequency band and a third frequency band;

The second radiator has a second feeding point and a third feeding point; the second feed source and the second radiator are electrically connected to the second feed point and used for exciting the second radiator to resonate in the second frequency band; the third feed source and the second radiator are electrically connected to the third feed point and used for exciting the second radiator to resonate in the third frequency band;

A distance between the third feed point and the second free end is less than a distance between the second feed point and the second free end;

The loop inductance is electrically connected between the first and third feed points.

3. The electronic device of claim 2, further comprising: a bandpass circuit for allowing part of the high frequency current to pass through the bandpass circuit itself back to ground;

one end of the band-pass circuit and the second radiator are electrically connected to a fourth connection point, and the other end of the band-pass circuit is connected to a third reference ground; the distance between the fourth connection point and the second free end is greater than the distance between the second feed point and the second free end.

4. The electronic device of claim 3, wherein the band pass circuit comprises a first capacitor and a first inductance connected in series, wherein the first inductance presents a high resistance to high frequency current, the first capacitor to isolate low frequency current of the NFC antenna.

5. The electronic device of claim 2, wherein the first frequency band comprises a GPS frequency band, a WIFI 2.4G frequency band; the second frequency band includes: LB frequency band; the third frequency band includes: ultra-high frequency UHB bands and ultra-wideband UWB bands.

6. The electronic device of claim 1, wherein the feed comprises a second feed, the respective frequency band comprising a second frequency band;

the second radiator has a second feed point; the second feed source and the second radiator are electrically connected to the second feed point and used for exciting the second radiator to resonate in the second frequency band;

the loop inductance is electrically connected between the first and second feed points.

7. The electronic device of claim 6, wherein the first frequency band comprises a GPS frequency band, a WIFI 2.4G frequency band; the second frequency band includes: low frequency LB band.

8. The electronic device of claim 1,2, 3, or 6, further comprising:

a first isolation capacitor electrically connected between the first radiator and the first reference ground, the first isolation capacitor for isolating NFC current; and/or the number of the groups of groups,

And the second isolation capacitor is electrically connected between the second radiator and the second reference ground and is used for isolating NFC current.

9. The electronic device of claim 8, wherein the first isolation capacitance has a value of 100pF; the value of the second isolation capacitor is 100pF; the loop inductance is a large inductance.

10. The antenna assembly of claim 9, wherein the loop inductance has a value of not less than 10nH.

11. The electronic device of claim 2, wherein the electronic device further comprises any combination of:

The first antenna element further comprises: the first matching circuit is arranged between the first feed point and the first feed source; the first matching circuit is used for filtering clutter of excitation signals transmitted by the first feed source to form first radio frequency signals of the first frequency band, and transmitting the first radio frequency signals to the first radiator to excite the first radiator to resonate in the first frequency band;

The second antenna unit further includes: the second matching circuit is arranged between the second feed point and the second feed source; the second matching circuit is used for filtering clutter of excitation signals transmitted by the second feed source, forming second radio frequency signals of the second frequency band and transmitting the second radio frequency signals to the second radiator so as to excite the second radiator to resonate in the second frequency band;

The second antenna unit further includes: the third matching circuit is arranged between the third feed point and the third feed source; the third matching circuit is used for filtering clutter of the excitation signals transmitted by the third feed source, forming third radio frequency signals of the third frequency band and transmitting the third radio frequency signals to the second radiator so as to excite the second radiator to resonate in the third frequency band.

12. The electronic device of claim 2, the first antenna unit further comprising: the first matching circuit is arranged between the first feed point and the first feed source; the second antenna unit further includes: the second matching circuit is arranged between the second feed point and the second feed source; the second antenna unit further includes: the third matching circuit is arranged between the third feed point and the third feed source;

the loop inductance is electrically connected between a first feed point at which the first matching circuit is connected to the first radiator, and a third feed point at which the third matching circuit is connected to the second radiator.

13. The electronic device of claim 6, the first antenna unit further comprising: the first matching circuit is arranged between the first feed point and the first feed source; the second antenna unit further includes: the second matching circuit is arranged between the second feed point and the second feed source;

The loop inductance is electrically connected between a first feed point at which the first matching circuit is connected to the first radiator, and a second feed point at which the second matching circuit is connected to the second radiator.

14. An electronic device according to claim 2 or 3, wherein the length of the first radiator corresponds to a quarter wavelength of the GPS band;

The length of the second radiator is corresponding to one eighth to one quarter wavelength of the LB frequency band.

15. The electronic device of claim 14, wherein a third antenna corresponding to the third feed is to generate:

the second feed source is connected with the ring mode of the third feed source and is used for supporting the transmission and/or the reception of electromagnetic wave signals of the first sub-frequency band;

the second feed source is connected to the ring mode of the first feed source and is used for supporting the transmission and/or the reception of electromagnetic wave signals of a second sub-frequency band;

A quarter wavelength mode from the first feed source to the gap is used for supporting the transmission and/or the reception of electromagnetic wave signals of a third sub-frequency band;

a three-quarter wavelength mode generated by the ground return current from the gap to the main board of the electronic equipment is used for supporting the transmission and/or the reception of electromagnetic wave signals of a fourth sub-frequency band;

The third feed source is in a quarter wavelength mode from the gap and is used for supporting the transmission and/or the reception of electromagnetic wave signals of a fifth sub-frequency band;

the third feed source is connected to the second reference ground through a ring mode and is used for supporting the transmission and/or the reception of electromagnetic wave signals of a sixth sub-frequency band;

A three-quarter wavelength mode of the slit to the first reference ground for supporting transmission and/or reception of electromagnetic wave signals of a seventh sub-band;

The first reference ground is in a five-quarter wavelength mode of the gap for supporting transmission and/or reception of electromagnetic wave signals of an eighth sub-band.

16. The antenna assembly of claim 15, wherein the pattern covers an N78 band, a WIFI 7G band, a UWB CH5 band.

17. The electronic device of claim 1,2,3 or 6, wherein a first antenna element in the antenna assembly is disposed on top of the electronic device and a second antenna element in the antenna assembly is disposed at an upper corner of the electronic device.

18. The electronic device of claim 17, the electronic device further comprising: the first side, the second side, the third side and the fourth side are sequentially connected, wherein the first side is opposite to the third side, and the second side is opposite to the fourth side;

The first antenna unit is partially arranged on the first side edge, the other part is arranged on the fourth side edge, the first grounding end is arranged on the first side edge, and the first free end is arranged on the fourth side edge; the second antenna unit is arranged on the fourth side edge.