A communication circuit, a communication method and an intelligent terminal

Abstract

The present application provides a communication circuit, a communication method and a smart terminal, wherein the communication circuit includes: an antenna element, the antenna element is a multi-turn annular coil structure; at least part of the internal coil of the antenna element is recessed inside the antenna element; wherein at least part of the internal coil is the innermost at least two turns of the internal coil. Through the above method, more complex functions can be realized in a smaller space, communication efficiency can be guaranteed, and signal loss can be reduced.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication circuit, a communication method and an intelligent terminal. Background Art

[0002] In order to meet communication needs, communication circuits need to receive and send wireless signals through antennas. More and more communication devices are developing towards diversified functions, miniaturization and compact layout. Under this trend, how to achieve more complex functions in a smaller device space, ensure communication efficiency, and minimize the signal loss of communication circuits, still needs further improvement. Summary of the invention

[0003] The present application provides a communication circuit, a communication method and an intelligent terminal, which can realize more complex functions in a smaller space, ensure communication efficiency and reduce signal loss.

[0004] In order to solve the above technical problems, the first aspect of the present application provides a communication circuit, wherein the communication circuit includes:

[0005] The antenna element is a multi-turn annular coil structure; at least part of the internal coil of the antenna element is recessed toward the inside of the antenna element; wherein at least part of the internal coil is the innermost at least two turns of the internal coil.

[0006] The antenna element is a NFC antenna, and the communication circuit also includes:

[0007] The first matching circuit and the second matching circuit are connected to the NFC antenna respectively; the first matching circuit is used to receive or send frequency modulation FM signals; the second matching circuit is used to process short-range wireless communication NFC signals.

[0008] The first matching circuit includes: a first filtering structure and a second filtering structure connected in series, the first filtering structure includes at least one group of resonant circuits, the second matching circuit includes a third filtering structure, and the third filtering structure includes a third inductor.

[0009] Among them, the first filtering structure includes two groups of resonant circuits connected in series, the first group of resonant circuits includes a first inductor and a first capacitor connected in parallel, and the second group of resonant circuits includes a second inductor and a second capacitor connected in parallel; wherein the capacitance of the first inductor is smaller than the capacitance of the second inductor; the capacitance of the first capacitor is smaller than the capacitance of the second capacitor; the second filtering structure includes a third capacitor connected in series with the resonant circuits respectively.

[0010] The outermost annular coil of the antenna element is in a rectangular, elliptical or circular shape; the center of the outermost annular coil is located on the midline of the concave portion.

[0011] The concave portion of the internal coil is in the shape of a rectangle, an ellipse or a circle; the side length of the rectangle, the diameter of the circle or the long diameter of the ellipse is 6 to 10 mm.

[0012] The antenna element further comprises a feeding point and a return point, wherein the feeding point and the return point are located on the same side of the recessed portion; the antenna element is connected to the first matching circuit and / or the second matching circuit via the feeding point and the return point to form a loop.

[0013] To solve the above technical problems, the second aspect of the present application provides a communication method for a communication circuit, wherein the communication circuit includes: an antenna element, the antenna element is a multi-turn ring coil structure; at least part of the internal coil of the antenna element is recessed toward the inner side of the antenna element; wherein at least part of the internal coil is the innermost at least two turns of the internal coil; the communication circuit also includes a first matching circuit and a second matching circuit, which are respectively connected to the antenna element; the communication method includes: determining the type of signal transmitted through the antenna element; in response to the signal being a frequency modulated FM signal, transmitting through the first matching circuit; in response to the signal being a wireless communication NFC signal, processing through the second matching circuit.

[0014] Among them, the first matching circuit includes: a first filtering structure and a second filtering structure connected in series, the first filtering structure includes at least one group of resonant circuits, the second matching circuit includes a third filtering structure, and the third filtering structure includes a third inductor; in response to the signal being a frequency modulated FM signal, it is transmitted through the first matching circuit; in response to the signal being a wireless communication NFC signal, the step of processing through the second matching circuit includes: transmitting the signal to the first matching circuit and the second matching circuit; in response to the signal being a frequency modulated FM signal, the third filtering structure filters the signal, and transmits the signal through the first matching circuit; in response to the signal being a wireless communication NFC signal, the first filtering structure and the second filtering structure connected in series filter the signal, and process the signal through the second matching circuit.

[0015] In order to solve the above technical problems, the third aspect of the present application provides a mobile terminal, the mobile terminal includes a communication circuit, and the communication circuit is any one of the communication circuits mentioned above.

[0016] Different from the prior art, the communication circuit, communication method and intelligent terminal provided by the present application improve the performance of antenna elements, can realize more complex functions in a smaller space, adapt to the device appearance design, improve universality, ensure communication efficiency and signal quality, and reduce signal loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a top view of the structure of an antenna element of an embodiment of the communication circuit of the present application;

[0018] Figure 2 is a structural top view of another embodiment of an antenna element of a communication circuit of the present application;

[0019] Figure 3 It is a structural schematic diagram of another embodiment of the communication circuit of the present application;

[0020] Figure 4 It is a structural top view of another embodiment of the antenna element of the communication circuit of the present application;

[0021] Figure 5 It is a structural schematic diagram of another implementation method of the communication circuit of the present application;

[0022] Figure 6 It is a flow chart of an implementation method of a communication circuit of the present application;

[0023] Figure 7 It is a flow chart of another implementation of a communication method of a communication circuit of the present application;

[0024] Figure 8 It is a structural diagram of an implementation method of a mobile terminal of the present application. DETAILED DESCRIPTION

[0025] The scheme of the embodiment of the present application is described in detail below in conjunction with the drawings of the specification.

[0026] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0027] The term "and / or" in this article is only a description of the association relationship of the associated objects. There can be three kinds of relationships. For example, A and / or B can be: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally means that the associated objects before and after are in an "or" relationship. In addition, "many" in this article means two or more than two.

[0028] Figure 3 , Figure 5 , Figure 8 The communication circuit and intelligent terminal in the figure are schematic diagrams of circuit logic, and the specific communication circuit structure is based on the communication circuit actually produced.

[0029] The present application first provides a communication circuit. Figure 1 , Figure 1 It is a top view of the structure of an antenna element of an embodiment of the communication circuit of the present application.

[0030] like Figure 1As shown, in order to solve the above technical problems, the technical solution adopted in the present application provides a communication circuit, wherein the communication circuit 100 includes:

[0031] The antenna element 101 is a multi-turn annular coil structure; at least part of the internal coil of the antenna element 101 is recessed toward the inside of the antenna element 101; wherein at least part of the internal coil is the innermost at least two turns of the internal coil.

[0032] The communication circuit 100 of the present application can be arranged in a communication device such as a smart terminal, a wearable device, etc. The communication circuit 100 receives or transmits a communication signal through an antenna element 101 .

[0033] In order to solve the technical problem of the present application, the antenna element 101 of the present application has a multi-turn ring coil structure. By connecting the antenna element 101 with the matching circuit, the set received signal frequency is filtered, modulated and demodulated, etc., so that the antenna can be used for multiplexing technology to receive and transmit communication signals of multiple frequency bands, which can effectively save space in the communication equipment and realize complex communication functions.

[0034] In a specific embodiment, the antenna element 101 is an NFC (Near Field Communication) antenna, which receives NFC communication signals, and reuses the antenna element 101 to receive FM (frequency modulation) signals, thereby improving the communication performance of FM and minimizing the impact on the performance of NFC. In other embodiments, the NFC communication signal and a fixed frequency signal may also be received.

[0035] During the antenna communication process, at least part of the internal coil is recessed toward the inside of the antenna element 101, thereby reducing the influence of the turbine effect of the annular coil structure on the communication effect, ensuring the communication efficiency and reducing the signal loss.

[0036] The outermost contour of the annular coil may be rectangular, circular or elliptical; the recessed structure formed may be rectangular, circular or elliptical in contour.

[0037] When the antenna element 101 is a three-turn circular coil, the two innermost turns are recessed toward the inner side of the antenna element 101; when the antenna element 101 is a four-turn circular coil, the two or three innermost turns are recessed toward the inner side of the antenna element 101; when the antenna element 101 is a five-turn circular coil, the two, three or four innermost turns are recessed toward the inner side of the antenna element 101. In other embodiments, the outermost circular coil may also be recessed toward the inner side of the antenna element 101 to further reduce the impact of the eddy current effect.

[0038] In an optional embodiment, in an optional embodiment, the antenna element 101 is a short-range wireless communication NFC antenna, and the communication circuit 100 also includes: a first matching circuit 102 and a second matching circuit 103, which are respectively connected to the NFC antenna; the first matching circuit 102 is used to receive or send a frequency modulated FM signal; the second matching circuit 103 is used to process a short-range wireless communication NFC signal.

[0039] After the antenna element 101 receives the communication signal, the communication signal enters the matching circuit. The corresponding filtering structures on the first matching circuit 102 and the second matching circuit 103 will block or weaken signals of other frequencies, and only allow signals within a specific frequency range to pass through and receive the corresponding communication signal.

[0040] In an optional implementation, the outermost annular coil of the antenna element 101 is rectangular, elliptical or circular; the center of the outermost annular coil is located on the midline of the recessed portion 1011 .

[0041] The recessed portion 1011 is located on one side of the annular coil and is centered thereon, which can ensure the symmetry of the magnetic flux lines passing through the annular coil. In other embodiments, it can also be located at any recessed position on one side with sufficient space to avoid other electronic components in the device.

[0042] In an optional embodiment, the recessed portion 1011 of the internal coil is rectangular, elliptical or circular; the side length of the rectangle, the diameter of the circle or the long diameter of the ellipse is 6 to 10 mm.

[0043] In order to ensure that the inner side of the antenna element 101 still has sufficient space to ensure the magnetic flux after the recessed portion 1011 is formed, the size of the recessed portion 1011 is controlled. When the outer contour size of the antenna element 101 is between 30 mm and 40 mm, the side length of the rectangle, the diameter of the circle, or the long diameter of the ellipse of the recessed portion 1011 corresponding to the internal coil is designed to be 6 to 10 mm, for example, 6 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 10 mm. When the outer contour of the antenna increases or decreases, the size of the recessed portion 1011 can be adjusted accordingly.

[0044] See also Figure 2 and Figure 3 , Figure 2 is a top view of the structure of another embodiment of the antenna element 101 of the communication circuit 100 of the present application; Figure 3 It is a structural diagram of another implementation of the communication circuit 100 of the present application.

[0045] In order to solve the above technical problems, the technical solution adopted in the present application provides a communication circuit 100, wherein the communication circuit 100 includes:

[0046] like Figure 2 As shown, the antenna element 101 has a multi-turn annular coil structure; at least part of the internal coil of the antenna element 101 is recessed toward the inside of the antenna element 101; wherein at least part of the internal coil is the innermost at least two turns of the internal coil.

[0047] The communication circuit 100 of the present application can be arranged in a communication device such as a smart terminal, a wearable device, etc. The communication circuit 100 receives or transmits a communication signal through an antenna element 101 .

[0048] In order to solve the technical problem of the present application, the antenna element 101 of the present application has a multi-turn ring coil structure. By connecting the antenna element 101 with the matching circuit, the set received signal frequency is filtered, modulated and demodulated, etc., so that the antenna can be used for multiplexing technology to receive and transmit communication signals of multiple frequency bands, which can effectively save space in the communication equipment and realize complex communication functions.

[0049] In a specific embodiment, the antenna element 101 is an NFC (Near Field Communication) antenna, which receives NFC communication signals, and multiplexes the antenna element 101 to receive FM (frequency modulation) signals. In other embodiments, the NFC communication signals and a fixed frequency signal can also be received.

[0050] During the antenna communication process, at least part of the internal coil is recessed toward the inside of the antenna element 101, thereby reducing the influence of the turbine effect of the annular coil structure on the communication effect, ensuring the communication efficiency and reducing the signal loss.

[0051] The outermost contour of the annular coil may be rectangular, circular or elliptical; the recessed structure formed may be rectangular, circular or elliptical in contour.

[0052] When the antenna element 101 is a three-turn circular coil, the two innermost turns are recessed toward the inner side of the antenna element 101; when the antenna element 101 is a four-turn circular coil, the two or three innermost turns are recessed toward the inner side of the antenna element 101; when the antenna element 101 is a five-turn circular coil, the two, three or four innermost turns are recessed toward the inner side of the antenna element 101. In other embodiments, the outermost circular coil may also be recessed toward the inner side of the antenna element 101 to further reduce the impact of the eddy current effect.

[0053] like Figure 3As shown, in an optional embodiment, the antenna element 101 is a short-distance wireless communication NFC antenna, and the communication circuit 100 also includes: a first matching circuit 102 and a second matching circuit 103, which are respectively connected to the NFC antenna; the first matching circuit 102 is used to receive or send a frequency modulated FM signal; the second matching circuit 103 is used to process a short-distance wireless communication NFC signal.

[0054] After the antenna element 101 receives the communication signal, the communication signal enters the matching circuit. The corresponding filtering structures on the first matching circuit 102 and the second matching circuit 103 will block or weaken signals of other frequencies, and only allow signals within a specific frequency range to pass through, receiving the corresponding communication signal and realizing complex communication functions.

[0055] In an optional embodiment, the first matching circuit 102 includes: a first filtering structure 1021 and a second filtering structure 1022 connected in series, the first filtering structure 1021 includes at least one group of resonant circuits (not shown in the figure), and the second matching circuit 103 includes a third filtering structure 1031, and the third filtering structure 1031 includes a third inductor (not shown in the figure).

[0056] The third filtering structure 1031 mainly filters FM signals of 78-108 MHz, and prevents FM signals from entering the second matching circuit 103. The third inductor of the third filtering structure 1031 is an inductor of 400nH to 800nH, such as 400nH, 500nH, 560nH, 600nH, 650nH, 700nH, 750nH, and 800nH.

[0057] The communication signal entering the first matching circuit 102 is processed by the first filtering structure 1021 and the second filtering structure 1022 to filter out the NFC signal and other non-FM signals. The second filtering structure 1022 filters the low-frequency NFC signal of 13.56 MHz, and the first filtering structure 1021 filters other non-FM signals. In a specific embodiment, the first matching circuit 102 is set to filter the NFC signal first and then filter other non-FM signals. In other embodiments, other non-FM signals may also be filtered first to ensure communication efficiency and communication quality.

[0058] In an optional embodiment, the first filtering structure 1021 includes two groups of resonant circuits connected in series, the first group of resonant circuits includes a first inductor and a first capacitor connected in parallel, and the second group of resonant circuits includes a second inductor and a second capacitor connected in parallel; wherein the capacitance of the first inductor is smaller than the capacitance of the second inductor; the capacitance of the first capacitor is smaller than the capacitance of the second capacitor; and the second filtering structure includes a third capacitor connected in series with the resonant circuits.

[0059] The capacitor and inductor of the resonant structure are selected to have a self-resonant frequency of 49-65 MHz, so that a stopband structure is built at 49-65 MHz to filter non-FM signals.

[0060] In a specific embodiment, the communication circuit 100 includes: a first filtering structure 1021 is a 18nH inductor and a 330pF capacitor connected in parallel, and a 22nH inductor and a 470pF capacitor connected in parallel, and a second filtering structure 1022 is a 300pF capacitor.

[0061] The two groups of capacitors and inductors are connected in series, the self-resonant frequency of the 18nH inductor and the 330pF capacitor is 65.30MHz, and the self-resonant frequency of the 22nH inductor and the 470pF capacitor is 49.49MHz; a stopband structure is built at 49-65MHz, similar to two layers of isolation walls. In other embodiments, a group of 18nH inductors and 330pF capacitors connected in parallel or 22nH inductors and 470pF capacitors connected in parallel can also be used to process the communication signal, or three groups of inductors and capacitors connected in parallel can be used to process the communication signal. The filter structure can be adjusted accordingly according to the production situation. In a specific embodiment, the filtering effect of using two groups of resonant circuits is improved by about 15% compared with using one group.

[0062] In an optional implementation, the outermost annular coil of the antenna element 101 is rectangular, elliptical or circular; the center of the outermost annular coil is located on the midline of the recessed portion 1011 .

[0063] The recessed portion 1011 is located on one side of the annular coil and is centered thereon, which can ensure the symmetry of the magnetic flux lines passing through the annular coil. In other embodiments, it can also be located at any recessed position on one side with sufficient space to avoid other electronic components in the device.

[0064] In an optional embodiment, the recessed portion 1011 of the internal coil is rectangular, elliptical or circular; the side length of the rectangle, the diameter of the circle or the long diameter of the ellipse is 6 to 10 mm.

[0065] In order to ensure that the inner side of the antenna element 101 still has sufficient space to ensure the magnetic flux after the recessed portion 1011 is formed, the size of the recessed portion 1011 is controlled. When the outer contour size of the antenna element 101 is between 30 mm and 40 mm, the side length of the rectangle, the diameter of the circle, or the long diameter of the ellipse of the recessed portion 1011 corresponding to the internal coil is designed to be 6 to 10 mm, for example, 6 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 10 mm. When the outer contour of the antenna increases or decreases, the size of the recessed portion 1011 can be adjusted accordingly.

[0066] See also Figure 4 and Figure 5 , Figure 4 is a structural diagram of another embodiment of the antenna element 101 of the communication circuit 100 of the present application; Figure 5 It is a structural diagram of another implementation manner of the communication circuit 100 of the present application.

[0067] In order to solve the above technical problems, the technical solution adopted in the present application provides a communication circuit 100, wherein the communication circuit 100 includes:

[0068] like Figure 4 As shown, the antenna element 101 has a multi-turn annular coil structure; at least part of the internal coil of the antenna element 101 is recessed toward the inside of the antenna element 101; wherein at least part of the internal coil is the innermost at least two turns of the internal coil.

[0069] The communication circuit 100 of the present application can be arranged in a communication device such as a smart terminal, a wearable device, etc. The communication circuit 100 receives or transmits a communication signal through an antenna element 101 .

[0070] In order to solve the technical problem of the present application, the antenna element 101 of the present application has a multi-turn ring coil structure. By connecting the antenna element 101 with the matching circuit, the set received signal frequency is filtered, modulated and demodulated, etc., so that the antenna can be used for multiplexing technology to receive and transmit communication signals of multiple frequency bands, which can effectively save space in the communication equipment and realize complex communication functions.

[0071] In a specific embodiment, the antenna element 101 is an NFC (Near Field Communication) antenna, which receives NFC communication signals, and multiplexes the antenna element 101 to receive FM (frequency modulation) signals. In other embodiments, the NFC communication signals and a fixed frequency signal can also be received.

[0072] During the antenna communication process, at least part of the internal coil is recessed toward the inside of the antenna element 101, thereby reducing the influence of the turbine effect of the annular coil structure on the communication effect, ensuring the communication efficiency and reducing the signal loss.

[0073] The outermost contour of the annular coil may be rectangular, circular or elliptical; the recessed structure formed may be rectangular, circular or elliptical in contour.

[0074] When the antenna element 101 is a three-turn circular coil, the two innermost turns are recessed toward the inner side of the antenna element 101; when the antenna element 101 is a four-turn circular coil, the two or three innermost turns are recessed toward the inner side of the antenna element 101; when the antenna element 101 is a five-turn circular coil, the two, three or four innermost turns are recessed toward the inner side of the antenna element 101. In other embodiments, the outermost circular coil may also be recessed toward the inner side of the antenna element 101 to further reduce the impact of the eddy current effect.

[0075] like Figure 3 As shown, in an optional embodiment, the antenna element 101 is a short-distance wireless communication NFC antenna, and the communication circuit 100 also includes: a first matching circuit 102 and a second matching circuit 103, which are respectively connected to the NFC antenna; the first matching circuit 102 is used to receive or send a frequency modulated FM signal; the second matching circuit 103 is used to process a short-distance wireless communication NFC signal.

[0076] After the antenna element 101 receives the communication signal, the communication signal enters the matching circuit. The corresponding filtering structures on the first matching circuit 102 and the second matching circuit 103 will block or weaken signals of other frequencies, and only allow signals within a specific frequency range to pass through, receiving the corresponding communication signal and realizing complex communication functions.

[0077] In an optional implementation, the outermost annular coil of the antenna element 101 is rectangular, elliptical or circular; the center of the outermost annular coil is located on the midline of the recessed portion 1011 .

[0078] The recessed portion 1011 is located on one side of the annular coil and is centered thereon, which can ensure the symmetry of the magnetic flux lines passing through the annular coil. In other embodiments, it can also be located at any recessed position on one side with sufficient space to avoid other electronic components in the device.

[0079] In an optional embodiment, the recessed portion 1011 of the internal coil is rectangular, elliptical or circular; the side length of the rectangle, the diameter of the circle or the long diameter of the ellipse is 6 to 10 mm.

[0080] In order to ensure that the inner side of the antenna element 101 still has sufficient space to ensure the magnetic flux after the recessed portion 1011 is formed, the size of the recessed portion 1011 is controlled. When the outer contour size of the antenna element 101 is between 30 mm and 40 mm, the side length of the rectangle, the diameter of the circle, or the long diameter of the ellipse of the recessed portion 1011 corresponding to the internal coil is designed to be 6 to 10 mm, for example, 6 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 10 mm. When the outer contour of the antenna increases or decreases, the size of the recessed portion 1011 can be adjusted accordingly.

[0081] When the outer contour of the antenna increases or decreases, the size of the recessed portion 1011 can be adjusted in a corresponding proportion, and changing the size of the coil will not affect the size of the set capacitance and inductance in the matching circuit.

[0082] Correspondingly, the line width of the coil and the spacing between the coils will also affect the size and number of turns of the coil, and the corresponding size and number of turns can be set according to the required performance of the antenna element 101. In an optional embodiment, the antenna element 101 includes: the center of the coil is located on the midline of the recessed portion 1011.

[0083] The recessed portion 1011 is located on one side of the annular coil and is centered thereon, which can ensure the symmetry of the magnetic flux lines passing through the annular coil. In other embodiments, it can also be located at any recessed position on one side with sufficient space to avoid other electronic components in the device.

[0084] In a specific embodiment, the antenna element 101 is a four-turn annular coil structure with a line width of 0.25 mm and a spacing between coils of 0.1 mm. The outer dimensions of the outermost annular coil are xL of 35 mm and yL of 33 mm, and the dimensions of the recessed portion 1011 are xW of 8 mm and yW of 8 mm. The influence of the antenna element 101 on the structural routing of the opposite current is reduced to improve the communication performance. In other embodiments, the spacing between the coils can also be 0.12 mm, 0.15 mm, or 0.2 mm.

[0085] In an optional embodiment, the communication circuit 100 includes: the antenna element 101 also includes a feeding point 1012 and a return point 1013, and the feeding point 1012 and the return point 1013 are located on the same side of the recessed portion 1011; the antenna element 101 is connected to the matching circuit through the feeding point 1012 and the return point 1013 to form a loop.

[0086] The antenna element 101 is connected to a signal spring antenna (not shown) via a feeding point 1012 and a return point 1013 at a bottom corner of one side, so that the ring coil and the matching circuit constitute a loop of the communication circuit 100 .

[0087] In an optional implementation, the communication circuit 100 includes: an antenna element 101 is disposed on a plastic substrate or a circuit board by lamination, etching or laser forming.

[0088] The antenna element 101 can be set on a FPC (Flexible Printed Circuit) that has high reliability, excellent flexibility, light weight, thin thickness, and good bendability through lamination and etching, or can be formed by directly plating on a plastic substrate through LDS (Laser-Direct-structuring) so that it is attached to the structural shell of a communication device such as a smart phone or a smart terminal wearable device.

[0089] In an optional implementation, the communication circuit 100 also includes a communication chip (not shown), and the matching circuit is connected to the corresponding communication chip. The communication chip performs modulation, demodulation, decoding or encryption on the communication signal received or to be transmitted to meet the communication needs of the communication device.

[0090] The communication circuit 100 provided in the above embodiment can improve the performance of antenna elements, realize more complex functions in a smaller space, adapt to the device appearance design, improve universality, ensure communication efficiency and signal quality, reduce signal loss, and meet production needs.

[0091] See also Figure 6 , Figure 6 This is a flow chart of an embodiment of a communication method of a communication circuit of the present application. The communication method is used for a communication circuit to receive or transmit a communication signal, wherein the communication circuit comprises: an antenna element, the antenna element is a multi-turn annular coil structure; at least part of the internal coil of the antenna element is recessed toward the inner side of the antenna element; wherein at least part of the internal coil is the innermost at least two turns of the internal coil; the communication circuit also comprises a first matching circuit and a second matching circuit, which are respectively connected to the antenna element; the communication method comprises:

[0092] S11: Determine the type of signal transmitted through the antenna element.

[0093] When the antenna receives communication signals for communication, at least part of the internal coil is recessed toward the inside of the antenna element, thereby reducing the influence of the turbine effect of the annular coil structure on the communication effect, ensuring communication efficiency and reducing signal loss.

[0094] S12: In response to the signal being a frequency modulated FM signal, transmitting it through a first matching circuit; in response to the signal being a wireless communication NFC signal, processing it through a second matching circuit.

[0095] In order to solve the technical problem of the present application, the antenna element of the present application has a multi-turn ring coil structure. By connecting the antenna element to the matching circuit, the set received signal frequency is filtered, modulated and demodulated, etc., so that the antenna can be used for multiplexing technology to receive and transmit communication signals in multiple frequency bands, which can effectively save space in the communication equipment and realize complex communication functions.

[0096] In other embodiments, NFC communication signals and a fixed frequency signal may also be received. After receiving the communication signal, the communication circuit may respond to the communication signal or actively send a communication signal for communication. After processing the communication signal, the communication circuit uses the antenna to convert the electrical signal into an electromagnetic wave signal to complete the communication signal transmission.

[0097] See also Figure 7 , Figure 7 This is a flow chart of another embodiment of a communication method for a communication circuit of the present application. The communication method is used for a communication circuit to receive or transmit a communication signal through an antenna element.

[0098] S21: Determine the type of signal transmitted through the antenna element.

[0099] When the antenna receives communication signals for communication, at least part of the internal coil is recessed toward the inside of the antenna element, thereby reducing the influence of the turbine effect of the annular coil structure on the communication effect, ensuring communication efficiency and reducing signal loss.

[0100] In response to the signal being a frequency modulated FM signal, the signal is transmitted through the first matching circuit; in response to the signal being a wireless communication NFC signal, the signal is processed through the second matching circuit.

[0101] In order to solve the technical problem of the present application, the antenna element of the present application has a multi-turn ring coil structure. By connecting the antenna element to the matching circuit, the set received signal frequency is filtered, modulated and demodulated, etc., so that the antenna can be used for multiplexing technology to receive and transmit communication signals in multiple frequency bands, which can effectively save space in the communication equipment and realize complex communication functions.

[0102] In an optional embodiment, the first matching circuit includes: a first filtering structure and a second filtering structure connected in series, the first filtering structure includes at least one group of resonant circuits, the second matching circuit includes a third filtering structure, and the third filtering structure includes a third inductor.

[0103] S22: Transmit the signal to the first matching circuit and the second matching circuit.

[0104] S23: In response to the signal being a frequency modulated FM signal, the third filtering structure filters the signal and transmits the signal through the first matching circuit; in response to the signal being a wireless communication NFC signal, the first filtering structure and the second filtering structure connected in series with each other filter the signal and process the signal through the second matching circuit.

[0105] After the antenna element receives the communication signal, the communication signal enters the matching circuit. The corresponding filtering structures on the first matching circuit and the second matching circuit will block or weaken signals of other frequencies, allowing only signals within a specific frequency range to pass through and receive the corresponding communication signal.

[0106] The communication signal entering the first matching circuit 102 is processed by the first filtering structure 1021 and the second filtering structure 1022 to filter out the NFC signal and other non-FM signals. The second filtering structure 1022 filters the low-frequency NFC signal of 13.56 MHz, and the first filtering structure 1021 filters other non-FM signals.

[0107] In other embodiments, NFC communication signals and a fixed frequency signal may also be received. After receiving the communication signal, the communication circuit may respond to the communication signal or actively send a communication signal for communication. After processing the communication signal, the communication circuit uses the antenna to convert the electrical signal into an electromagnetic wave signal to complete the communication signal transmission.

[0108] The communication method provided in the above-mentioned implementation manner can improve the universality of the communication circuit, can enhance the performance of the antenna element, can realize more complex functions in a smaller space, ensure the communication efficiency and signal quality, and reduce the signal loss.

[0109] This application provides a mobile terminal, see Figure 8 , Figure 8 It is a structural diagram of an implementation method of a mobile terminal of the present application.

[0110] The mobile terminal includes a communication circuit, and the communication circuit is any one of the communication circuits described above.

[0111] In an optional implementation, the mobile terminal 200 includes a communication circuit, which includes an antenna element 101, where the antenna element 101 includes a multi-turn coil; some turns inside the coil form a protruding structure protruding toward the inside of the coil.

[0112] In an optional implementation, the outermost annular coil of the antenna element 101 is rectangular, elliptical or circular; the center of the outermost annular coil is located on the midline of the recessed portion 1011 .

[0113] The recessed portion 1011 is located on one side of the annular coil and is centered thereon, which can ensure the symmetry of the magnetic flux lines passing through the annular coil. In other embodiments, it can also be located at any recessed position on one side with sufficient space to avoid other electronic components in the device.

[0114] In an optional embodiment, the recessed portion 1011 of the internal coil is rectangular, elliptical or circular; the side length of the rectangle, the diameter of the circle or the long diameter of the ellipse is 6 to 10 mm.

[0115] In order to ensure that the inner side of the antenna element 101 still has sufficient space to ensure the magnetic flux after the recessed portion 1011 is formed, the size of the recessed portion 1011 is controlled. When the outer contour size of the antenna element 101 is between 30 mm and 40 mm, the side length of the rectangle, the diameter of the circle, or the long diameter of the ellipse of the recessed portion 1011 corresponding to the internal coil is designed to be 6 to 10 mm, for example, 6 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 10 mm. When the outer contour of the antenna increases or decreases, the size of the recessed portion 1011 can be adjusted accordingly.

[0116] In an optional embodiment, the antenna element 101 can be set on a FPC (Flexible Printed Circuit) that has high reliability, excellent flexibility, light weight, thin thickness, and good bendability through lamination and etching, or through LDS (Laser-Direct-structuring) to directly form the antenna element 101 by chemical plating on a plastic substrate, so that it can be attached to, for example, a smart terminal structural shell, further saving space.

[0117] The antenna element 101 of the present application is a multi-turn annular coil structure, and at least part of the internal coil is recessed toward the inside of the antenna element 101. During the antenna communication process, the influence of the turbine effect of the annular coil structure on the communication effect is reduced, the communication efficiency is guaranteed, and the signal loss is reduced.

[0118] By connecting the antenna element 101 with the matching circuit, the set received signal frequency is filtered, modulated and demodulated, etc., so that the antenna can be used for multiplexing technology to receive and transmit communication signals in multiple frequency bands, which can effectively save space in the communication equipment and realize complex communication functions.

[0119] In a specific embodiment, the antenna element 101 is an NFC (Near Field Communication) antenna, which receives NFC communication signals, and reuses the antenna element 101 to receive FM (frequency modulation) signals, thereby improving the communication performance of FM and minimizing the impact on the performance of NFC. In other embodiments, the NFC communication signal and a fixed frequency signal may also be received.

[0120] In an optional embodiment, the first matching circuit includes: a first filtering structure and a second filtering structure connected in series, the first filtering structure includes at least one group of resonant circuits, the second matching circuit includes a third filtering structure, and the third filtering structure includes a third inductor.

[0121] After the antenna element 101 receives the communication signal, the communication signal enters the matching circuit. The corresponding filtering structures on the first matching circuit 102 and the second matching circuit 103 will block or weaken signals of other frequencies, and only allow signals within a specific frequency range to pass through and receive the corresponding communication signal.

[0122] The communication signal entering the first matching circuit 102 is processed by the first filtering structure (not shown) and the second filtering structure (not shown), and the NFC signal and other non-FM signals are filtered out. The second filtering structure can use a 330pF capacitor to filter the low-frequency NFC signal of 13.56MHz, and use the first filtering structure to filter other non-FM signals. In a specific embodiment, the first matching circuit 102 is set to filter the NFC signal first, and then filter other non-FM signals. In other embodiments, other non-FM signals can also be filtered first to ensure communication efficiency and communication quality. The third filtering structure (not shown) mainly filters the FM signal of 78-108MHz, which will prevent the FM signal from entering the second matching circuit 103. The environment of existing components is utilized to the maximum extent, without adding additional antenna elements, effectively reducing costs, and also helping the design of the overall structure.

[0123] In an optional embodiment, the antenna element 101 can be set on a FPC (Flexible Printed Circuit) that has high reliability, excellent flexibility, light weight, thin thickness, and good bendability through lamination and etching, or through LDS (Laser-Direct-structuring) to directly form the antenna element 101 by chemical plating on a plastic substrate, so that it can be attached to, for example, a smart terminal structural shell, further saving space.

[0124] After the antenna element 101 receives the communication signal, the communication signal enters the matching circuit. The corresponding filtering structures on the first matching circuit 102 and the second matching circuit 103 will block or weaken signals of other frequencies, and only allow signals within a specific frequency range to pass through and receive the corresponding communication signal.

[0125] Different from the prior art, the communication circuit, communication method and intelligent terminal provided by the present application improve the performance of antenna elements, can realize more complex functions in a smaller space, adapt to the device appearance design, improve universality, ensure communication efficiency and signal quality, reduce signal loss, and meet production needs.

[0126] In the several embodiments provided in the present application, it should be understood that the disclosed systems and devices can be implemented in other ways. For the technical solutions in the embodiments of the present application, it is obvious that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. For example, the device implementation described above is only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0127] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0128] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "coupled", "connected", "connected", "set", and "installed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0129] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0130] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0131] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A communication circuit, characterized in that: The communication circuit comprises: An antenna element, wherein the antenna element is a multi-turn annular coil structure; At least part of the internal coil of the antenna element is recessed toward the inside of the antenna element; wherein at least part of the internal coil is the innermost internal coil of at least two turns.

2. The communication circuit according to claim 1, characterized in that: The antenna element is a near-field wireless communication NFC antenna, and the communication circuit further includes: A first matching circuit and a second matching circuit are connected to the NFC antenna respectively; The first matching circuit is used for receiving or sending a frequency modulation FM signal; the second matching circuit is used for processing a near field wireless communication NFC signal.

3. The communication circuit according to claim 2, characterized in that: The first matching circuit includes: a first filtering structure and a second filtering structure connected in series, the first filtering structure includes at least one group of resonant circuits, the second matching circuit includes a third filtering structure, and the third filtering structure includes a third inductor.

4. The communication circuit according to claim 3, characterized in that: The first filtering structure includes two groups of resonant circuits connected in series, the first group of resonant circuits includes a first inductor and a first capacitor connected in parallel, and the second group of resonant circuits includes a second inductor and a second capacitor connected in parallel; wherein the capacitance of the first inductor is smaller than the capacitance of the second inductor; the capacitance of the first capacitor is smaller than the capacitance of the second capacitor; and the second filtering structure includes a third capacitor connected in series with the resonant circuits respectively.

5. The communication circuit according to claim 1, characterized in that: The outermost annular coil of the antenna element is in a rectangular, elliptical or circular shape; the center of the outermost annular coil is located on the midline of the recessed portion.

6. The communication circuit according to claim 5, characterized in that: The concave portion of the internal coil is in the shape of a rectangle, an ellipse or a circle; the side length of the rectangle, the diameter of the circle or the long diameter of the ellipse is 6 to 10 mm.

7. The communication circuit according to claim 2, characterized in that: The antenna element further comprises a feed point and a return point, wherein the feed point and the return point are located on the same side of the recessed portion; The antenna element is connected to the first matching circuit and / or the second matching circuit through the feeding point and the return point to form a loop.

8. A communication method for a communication circuit, characterized in that: The communication circuit comprises: an antenna element, the antenna element is a multi-turn annular coil structure; at least part of the internal coil of the antenna element is recessed inside the antenna element; wherein at least part of the internal coil is the innermost at least two turns of the internal coil; the communication circuit further comprises a first matching circuit and a second matching circuit, which are respectively connected to the antenna element; the communication method comprises: determining a type of signal transmitted by the antenna element; In response to the signal being a frequency modulated FM signal, the signal is transmitted through the first matching circuit; in response to the signal being a wireless communication NFC signal, the signal is processed through the second matching circuit.

9. The communication method according to claim 8, characterized in that: The first matching circuit comprises: a first filtering structure and a second filtering structure connected in series, the first filtering structure comprises at least one group of resonant circuits, the second matching circuit comprises a third filtering structure, and the third filtering structure comprises a third inductor; The steps of transmitting the signal through the first matching circuit in response to the signal being a frequency modulated FM signal; and processing the signal through the second matching circuit in response to the signal being a wireless communication NFC signal include: transmitting the signal to the first matching circuit and the second matching circuit; In response to the signal being a frequency modulated FM signal, the third filtering structure filters the signal and transmits the signal through the first matching circuit; In response to the signal being a wireless communication NFC signal, the first filter structure and the second filter structure connected in series with each other filter the signal, and the signal is processed through the second matching circuit.

10. A mobile terminal, characterized in that: The mobile terminal includes a communication circuit, and the communication circuit is the communication circuit according to any one of claims 1 to 7.

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