Wireless communication device and electronic tag

Abstract

The invention relates to a wireless communication device and an electronic tag. The wireless communication device comprises a substrate, and a first antenna assembly, an energy collection module and a load module which are all arranged on the substrate. The first antenna assembly comprises a radio frequency antenna and an energy collection antenna which are mutually coupled, the radio frequency antenna is used for coupling radio frequency signals for communication, and the energy collection antenna is used for coupling the radio frequency signals to generate electric signals; the energy collection module is connected with the energy collection antenna and the load module and used for generating a starting signal according to the electric signal, and the load module is started according to the starting signal; the first antenna assembly not only can be used for radio frequency communication, but also can be used for collecting the energy of the radio frequency signal, and the energy collection module generates the starting signal capable of triggering the starting of the load module based on the energy, so that the function of the wireless communication device is not single any more, and the wireless communication device also has the function of being compatible with other load modules.

Description

Technical Field

[0001] This application belongs to the field of antenna technology, and in particular relates to a wireless communication device and an electronic tag. Background Technology

[0002] With rapid societal development, product miniaturization, multifunctionality, and cost control are becoming increasingly important and mainstream trends. Currently, there are many Radio Frequency Identification (RFID) tags and RFID power harvesting solutions on the market. RFID antennas are largely similar in shape and form, with limited functionality, and it is impossible to maintain RFID performance even as antenna size decreases. RFID power harvesting antennas are mostly traditional power harvesting methods, with limited performance, large size, high cost, limited application scenarios, and incompatibility with other functions. Summary of the Invention

[0003] The purpose of this application is to provide a wireless communication device and an electronic tag, which aims to solve the problem that traditional RFID antennas have limited performance and are not compatible with other functions.

[0004] In a first aspect, embodiments of this application provide a wireless communication device, including a substrate, and a first antenna assembly, a radio frequency chip, a power acquisition module, and a load module, all disposed on the substrate; The first antenna assembly includes a mutually coupled radio frequency antenna and a power acquisition antenna. The radio frequency antenna is connected to the radio frequency chip and coupled to the power acquisition antenna for radio frequency communication. The power acquisition antenna is used to couple radio frequency signals to generate electrical signals. The energy harvesting module is connected to the energy harvesting antenna and the load module, and is used to generate a start signal according to the electrical signal. The load module is used to start according to the start signal.

[0005] In one embodiment, the energy-collecting antenna includes an energy-collecting arm, a bent arm, and a coupling arm, all arranged on a first surface of the substrate; the energy-collecting arm is located on one side of the radio frequency antenna; a first end of the bent arm is connected to the energy-collecting arm, and a second end is connected to the coupling arm, located between the radio frequency antenna and the energy-collecting arm; the coupling arm is disposed along a portion of the edge of the radio frequency antenna and has a coupling gap with the radio frequency antenna.

[0006] In one embodiment, the energy-collecting arm is a rectangular radiator used to adjust the impedance, bandwidth, and efficiency of the energy-collecting antenna.

[0007] In one embodiment, the bent arm is a serpentine microstrip line used to adjust the imaginary impedance of the energy-collecting antenna.

[0008] In one embodiment, the coupling arm includes a first microstrip line segment and a second microstrip line segment, a first end of the first microstrip line segment is connected to a second end of the bent arm, a second end of the first microstrip line segment is connected to a first end of the second microstrip line segment, and a second end of the second microstrip line segment is connected to the energy harvesting module.

[0009] In one embodiment, the radio frequency antenna includes an annular radiator disposed on a first surface of the substrate and an impedance matching patch disposed on a second surface of the substrate, the first surface and the second surface being disposed opposite to each other, the orthographic projection of the annular radiator on the second surface at least partially coinciding with the impedance matching patch, and a coupling gap being formed between a portion of the annular radiator and a portion of the energy-collecting antenna.

[0010] In one embodiment, the energy harvesting module includes a matching network and a voltage multiplier circuit. The matching network is connected to the energy harvesting antenna and is used to receive, store, and release a voltage signal from the current signal output by the energy harvesting antenna. The voltage multiplier circuit is connected to the matching network and is used to boost the voltage signal and output the start signal.

[0011] In one embodiment, the matching network includes a first resistor, a first inductor, a first capacitor, and a second inductor. A first end of the first resistor is connected to the energy-collecting antenna, a second end of the first resistor is connected to a first end of the first inductor and a first end of the first capacitor, a second end of the first inductor is grounded, a second end of the first capacitor is connected to a first end of the second inductor, and a second end of the second inductor is connected to the voltage doubler circuit.

[0012] In one embodiment, the voltage multiplier circuit includes a three-terminal Schottky diode and a second capacitor. The Schottky diode includes a first Schottky diode and a second Schottky diode. The anode of the first Schottky diode is grounded. The cathode of the first Schottky diode is connected to the anode of the second Schottky diode and the second terminal of the second inductor. The cathode of the second Schottky diode is connected to the first terminal of the second capacitor and serves as the output terminal of the voltage multiplier circuit. The second terminal of the second capacitor is grounded.

[0013] In one embodiment, the load module includes a communication antenna and a Bluetooth chip and / or a starlight chip connected to the communication antenna.

[0014] In one embodiment, the communication antenna and the first antenna assembly are arranged in the clearance area of ​​the substrate.

[0015] Secondly, embodiments of this application provide an electronic tag, including: Battery module; As described above, in the wireless communication device, the load module of the wireless communication device is connected to the battery module, and the load module includes a communication module.

[0016] In one embodiment, the battery module includes a flexible battery, the substrate of the wireless communication device includes a flexible substrate, and the electronic tag is rollable.

[0017] The beneficial effects of this application embodiment compared with related technologies are as follows: The wireless communication device provided in this application embodiment includes a substrate, and a first antenna assembly, an energy harvesting module, and a load module, all arranged on the substrate; the first antenna assembly includes a mutually coupled radio frequency antenna and an energy harvesting antenna, the radio frequency antenna is used to couple radio frequency signals for communication, and the energy harvesting antenna is used to couple radio frequency signals to generate electrical signals; the energy harvesting module is connected to the energy harvesting antenna and the load module, and is used to generate a start signal according to the electrical signal, and the load module is used to start according to the start signal; the first antenna assembly can not only be used for radio frequency communication, but also for collecting the energy of radio frequency signals, and the energy harvesting module generates a start signal based on the energy that can be used to trigger the start of the load module, thereby making the function of the wireless communication device no longer singular, but also compatible with the function of other load modules. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a module of a wireless communication device provided in an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the structure of a wireless communication device provided in an embodiment of this application.

[0020] Figure 3 This is a schematic diagram of the structure of a wireless communication device provided in an embodiment of this application.

[0021] Figure 4 A circuit diagram of the energy harvesting module of a wireless communication device provided in an embodiment of this application.

[0022] Figure 5 This is a schematic diagram of the structure of an electronic tag provided in an embodiment of this application.

[0023] Figure 6 An equivalent circuit model of the electromagnetic coupling between the radio frequency antenna and the energy collection antenna in a wireless communication device provided in an embodiment of this application. Detailed Implementation

[0024] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0025] Unless otherwise defined, 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0027] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0028] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0031] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0032] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0033] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0034] Currently, there are many RFID tags and RF energy harvesting solutions on the market. RFID antennas are largely similar in shape and form, with limited functionality, and it's impossible to maintain RF performance even when antenna size decreases. RF energy harvesting antennas are mostly traditional methods, offering limited performance, large size, high cost, and limited application scenarios, and are incompatible with other functions. Furthermore, RFID tags and RF energy harvesting tags on the market cannot be produced from rolls, making them unprintable. The activation circuit requires significant energy, and using antennas for energy harvesting necessitates high-power transmitting devices, which is limited by the inability of some printers to provide high gain and high power.

[0035] To reduce product costs, meet customer functional requirements, and minimize size, this invention breaks away from traditional energy-collecting tag methods. The inventive concept of this application lies in breaking away from the traditional usage and form of RFID antennas and energy-collecting antennas. Functionally, it also differs from traditional energy-collecting tags. Traditional energy-collecting tags use a single energy-collecting antenna to collect energy and power another module. However, our energy-collecting tag simultaneously provides power to another module while performing RFID functionality. This results in a smaller overall tag size and higher energy collection efficiency.

[0036] Specifically, this application provides a wireless communication device 100, including a substrate 10, and a first antenna assembly 20, a radio frequency chip 30, a power acquisition module 40, and a load module 50, all arranged on the substrate 10. The first antenna assembly 20 includes a radio frequency antenna 21 and a power acquisition antenna 22 coupled to each other. The radio frequency antenna 21 is connected to the radio frequency chip 30 and coupled to the power acquisition antenna 22 for radio frequency communication (e.g., RFID). The power acquisition antenna 22 is used to couple radio frequency signals to generate electrical signals. The power acquisition module 40 is connected to the power acquisition antenna 22 and the load module 50 and is used to generate a start signal according to the electrical signal. The load module 50 is used to start according to the start signal.

[0037] In this design, the radio frequency (RF) antenna 21 and the energy harvesting antenna 22 are coupled together. Besides harvesting energy, the energy harvesting antenna 22 is also coupled to the RF antenna 21 to participate in RF communication, thus enhancing the antenna's radiation performance. Furthermore, a portion of the RF energy radiated by the RF antenna 21 is radiated outwards for RF communication, while another portion is coupled to the energy harvesting antenna 22 to be harvested as energy and directed to the energy harvesting module 40. The interaction between the RF antenna 21 and the energy harvesting antenna 22 not only enhances the performance of RF communication but also increases the amount of energy that can be harvested, thus expanding its functionality and improving its overall performance.

[0038] The load module 50 can be any circuit or component. In some scenarios, when the wireless communication device 100 is not performing radio frequency communication, the load module 50 is in a sleep / power-off state. When performing radio frequency communication, the load module 50 is activated after receiving a start signal generated by the energy collection module 40 based on the radio frequency communication, and the load module 50 is awakened. Therefore, in this scenario, not only is the functionality of the wireless communication device 100 expanded, but the power consumption of the wireless communication device 100 is also saved. For example, the load module 50 may include a communication module, such as a module for Bluetooth (BLE), NearLink, or WiFi communication. For example, the load module 50 may include a positioning module, a charging module, etc., depending on the specific application scenario of the wireless communication device 100.

[0039] In some scenarios, when the first antenna component 20 is coupled to a radio frequency (RF) signal, the RF antenna 21 reads or writes data to the RF chip 30 based on the RF signal and its energy, and provides feedback via the first antenna component 20 in the form of an RF signal. Simultaneously, the acquisition module generates a start signal based on the energy of the aforementioned RF signal, waking up the load module 50 and enabling it to perform corresponding operations.

[0040] Please see Figure 2 and Figure 3In one embodiment, the radio frequency antenna 21 includes an annular radiator 211 disposed on a first surface 101 of the substrate 10 and an impedance matching patch 212 disposed on a second surface 102 of the substrate 10. The first surface 101 and the second surface 102 are disposed opposite to each other. The orthographic projection of the annular radiator 211 on the second surface 102 at least partially coincides with the impedance matching patch 212. A portion of the annular radiator 211 has a coupling gap with a portion of the energy-collecting antenna 22.

[0041] The impedance matching patch 212 is used to adjust the impedance of the radio frequency antenna 21. For example, the annular radiator 211 has a rectangular outer edge, and the impedance matching patch 212 is rectangular. In other examples, the outer edge of the annular radiator 211 and the impedance matching patch 212 can form other polygonal or circular shapes. It is understood that the impedance matching patch 212 can be a conductive patch or a copper-clad microstrip line.

[0042] In one embodiment, a notch is formed on the side of the annular radiator 211 opposite to the RF chip 30, which prevents the annular radiator 211 from closing. Feed stubs 214 are respectively provided at both ends of the notch, and the two feed stubs 214 are directly connected to the feed port 215 and to the RF chip 30 (see...). Figure 1 )connect.

[0043] Please see Figure 2 In one embodiment, the energy-collecting antenna 22 includes an energy-collecting arm 221, a bent arm 222, and a coupling arm 223, all arranged on the first surface 101 of the substrate 10. The energy-collecting arm 221 is located on one side of the radio frequency antenna 21. The first end of the bent arm 222 is connected to the energy-collecting arm 221, and the second end is connected to the coupling arm 223, located between the radio frequency antenna 21 and the energy-collecting arm 221. The coupling arm 223 is disposed along a portion of the edge of the radio frequency antenna 21 and has a coupling gap with the radio frequency antenna 21.

[0044] Understandably, the bending design of the bent arm 222 helps reduce space occupation while allowing for inductive loading, which can be used to adjust the imaginary impedance of the energy harvesting antenna 22. For example, the bent arm 222 is a serpentine microstrip line. A coupling gap exists between the coupling arm 223 and the RF antenna 21, allowing the energy harvesting antenna 22 to couple with the RF antenna 21 and generate an induced current. This enhances the performance of RF communication and facilitates energy harvesting.

[0045] In one embodiment, the energy-collecting arm 221 is a rectangular radiator used to adjust the impedance, bandwidth, and efficiency of the energy-collecting antenna 22. For example, a larger area can effectively reduce impedance. It is understood that the rectangular radiator can be a conductive patch or a copper-clad microstrip line.

[0046] In one embodiment, the annular radiator 211 has a rectangular outer edge, and the coupling arm 223 includes a first microstrip segment 223A and a second microstrip segment 223B. The first end of the first microstrip segment 223A is connected to the second end of the bent arm 222, the second end of the first microstrip segment 223A is connected to the first end of the second microstrip segment 223B, and the second end of the second microstrip segment 223B is connected to the energy harvesting module 40.

[0047] The first microstrip segment 223A and the first arm 211A of the annular radiator 211 on the side away from the RF chip 30 form a first extended electromagnetic coupling region. The width of the first coupling gap between the first microstrip segment 223A and the first arm 211A is d1. The second microstrip segment 223B and the second arm 211B of the annular radiator 211 on the side away from the energy-collecting arm 221 form a second extended electromagnetic coupling region. The width of the second coupling gap between the second microstrip segment 223B and the second arm 211B is d2. The first arm 211A and the second arm 211B are connected. By adjusting the values ​​of d1 and d2, the coupling strength and impedance can be adjusted. This allows the energy-collecting antenna 22 to couple to the RF signal of the RF antenna 21, assisting the RF antenna 21 in radiating while collecting a portion of the energy to activate the load module 50.

[0048] Please see Figure 4 In one embodiment, the energy harvesting module 40 includes a matching network 410 and a voltage multiplier circuit 420. The matching network 410 is connected to the energy harvesting antenna 22 and is used to receive, store, and release the voltage signal output by the energy harvesting antenna 22. The voltage multiplier circuit 420 is connected to the matching network 410 and is used to boost the voltage signal and output a start signal RF_OUT. The matching network 410 is used to balance the energy radiated by the RF antenna 21 and the energy collected by the energy harvesting antenna 22; the voltage multiplier circuit 420 boosts the voltage signal so that it can be effectively identified by the load module 50.

[0049] In one embodiment, the matching network 410 includes a first resistor R1, a first inductor L1, a first capacitor C1, and a second inductor L2. The first end of the first resistor R1 is connected to the energy-collecting antenna 22. The second end of the first resistor R1 is connected to the first end of the first inductor L1 and the first end of the first capacitor C1. The second end of the first inductor L1 is grounded. The second end of the first capacitor C1 is connected to the first end of the second inductor L2. The second end of the second inductor L2 is connected to the voltage multiplier circuit 420. It is understood that the first capacitor C1 is used to couple the current signal flowing from the energy-collecting antenna 22 and to store and release this electrical energy.

[0050] In one embodiment, the voltage multiplier circuit 420 includes a three-terminal Schottky diode SD1 and a second capacitor C2. The Schottky diodes include a first Schottky diode and a second Schottky diode. The anode of the first Schottky diode is grounded, and the cathode of the first Schottky diode is connected to the anode of the second Schottky diode and the second terminal of the second inductor L2. The cathode of the second Schottky diode is connected to the first terminal of the second capacitor C2 and serves as the output terminal of the voltage multiplier circuit 420. The second terminal of the second capacitor C2 is grounded. It is understood that the three-terminal Schottky diode SD1 and the second capacitor C2 are used for voltage multiplication and rectification, outputting a valid start signal RF_OUT to the load module 50.

[0051] Please see Figure 2 In one embodiment, the load module 50 includes a communication antenna 510 and a Bluetooth chip and / or a strobe chip 520 connected to the communication antenna 510. In this embodiment, the load module 50 is a communication module, which can be a Bluetooth communication module, including a Bluetooth communication antenna 510 and a Bluetooth chip; or a strobe communication module, including a strobe communication antenna 510 and a strobe chip. The Bluetooth chip and / or the strobe chip 520 is connected to the energy harvesting module 40 and is powered on upon activation by a start signal. After normal operation, the power supply is provided by the battery module 200. See [link to relevant documentation]. Figure 5 .

[0052] Please see Figure 2 and Figure 3 In one embodiment, the communication antenna 510 and the first antenna assembly 20 are arranged in the clearance area 110 of the substrate 10, thereby improving the performance of the antenna.

[0053] In one embodiment, a copper-clad area 120 adjacent to the clearance area is further provided on the substrate 10. All circuit components in the wireless communication device 100, except for the communication antenna 510, the radio frequency antenna 21, and the power acquisition antenna 22 (e.g., the radio frequency chip 30, the power acquisition module 40, and the circuits / chips in the load module 50), are disposed on the copper-clad area 120. For example, the wireless communication device 100 also includes a battery module 200 (see...). Figure 5 In the case of a battery module 200, the negative terminal will be connected to the copper-clad substrate of the copper-clad area, and the positive terminal will be connected to the load module 50 through the power supply circuit 60 for power supply.

[0054] Please see Figure 5 Secondly, this application also provides an electronic tag, which includes the wireless communication device 100 and battery module 200 in any of the above embodiments. The load module 50 of the wireless communication device 100 is connected to the battery module 200, and the load module 50 is, for example, the communication module described above.

[0055] The core working principle of the electronic tag in this application embodiment lies in the electromagnetic coupling between the radio frequency antenna 21 and the energy collection antenna 22, and the mutual inductance between the two antennas, allowing the radio frequency signal of the radio frequency antenna 21 to be coupled to the energy collection antenna 22 and radiated outwards. Simultaneously, a portion of the energy radiated by the radio frequency antenna 21 and the radio frequency energy received by the energy collection antenna 22 are superimposed on the energy collected by the energy collection antenna 22 itself to power the subsequent energy collection module 40. The energy collection module 40 uses a matching network 410 and a voltage multiplier circuit 420 to balance the energy radiated by the radio frequency antenna 21 and the energy collected by the energy collection antenna 22, ensuring the radio frequency performance of the radio frequency antenna 21 while also allowing the energy collection antenna 22 to effectively start the communication module after collecting radio frequency energy, thus achieving a small product size with good antenna performance.

[0056] In one embodiment, the battery module 200 includes a flexible battery, the substrate 10 of the wireless communication device 100 includes a flexible substrate 10, and the electronic tag is rollable.

[0057] The electronic tag in this application embodiment transforms the traditional, costly energy harvesting scheme into a simpler antenna energy harvesting method, while simultaneously maintaining radio frequency (RF) functionality. Through the coupling design and circuit matching integration of the RF antenna 21 and the energy harvesting antenna 22, an energy harvesting antenna 22 is designed on the basis of the original RF antenna 21 to power and activate another communication module, achieving RFID tag functionality while also possessing features such as Bluetooth. Furthermore, through antenna design and circuit matching, maximum energy harvesting efficiency is achieved with the smallest tag size, enabling the electronic tag to be produced from roll stock and printed on a printer.

[0058] Combination Figures 1 to 6 The working principle of the electronic tag and wireless communication device 100 in this application embodiment is as follows: An LC series resonant circuit is formed by the first capacitor C1 and the second inductor L2, as shown by the following formula: (1) It can be seen that adjusting the capacitance C of the first capacitor C1 and the inductance L of the second inductor L2 can partially cancel out the capacitive reactance and inductive reactance in the matching network 410, thereby generating electromagnetic oscillation and transferring energy.

[0059] The electromagnetic coupling between the first arm 211A of the RF antenna 21 and the first microstrip segment 223A of the energy-collecting antenna 22, and between the second arm 211B of the RF antenna 21 and the second microstrip segment 223B of the energy-collecting antenna 22, can be simplified as follows: Figure 6 The model in the image shows the input impedance as seen from the feed point of the RF antenna 21 as follows: (2) In formula (2), M is the mutual inductance between the energy-collecting antenna 22 and the radio frequency antenna 21, which represents the coupling strength between them and can be adjusted by the size of the coupling gap widths d1 and d2. It is the impedance of the RF antenna 21 itself, the value of which depends on the inductance of the feed transformer itself. , can be represented as: (3) Z A This is the impedance value of the energy-collecting antenna 22 in the uncoupled state, determined by the impedance R of the energy-collecting antenna 22 itself. A Capacitor C and Inductor L A Composition. When the resonant frequency is At that time, Z A The radiation resistance R of the antenna near the resonant frequency can be determined by... r With frequency Relevant quality factor Q characterization: (4) The real and imaginary parts of the input impedance of the energy-collecting antenna 22 can be obtained from equations (1) to (4) above.

[0060] The real part of the input impedance: ; The imaginary part of the input impedance: ; in: ; When the resonant frequencies of the energy-collecting antenna 22 and the radio frequency antenna 21 are the same, that is... When this happens, the real part of the input impedance of the energy-collecting antenna 22 can be changed to: The imaginary part of the input impedance can be transformed into: .

[0061] As can be seen from the above, the real part of the input impedance of the first antenna component 20 is controlled by the coupling coefficient between the energy-collecting antenna 22 and the radio frequency antenna 21 and the resistance of the energy-collecting antenna 22 itself, while the imaginary part depends on the inductance of the radio frequency antenna 21. Therefore, the input impedance of the first antenna component 20 can be controlled independently.

[0062] like Figure 2 and Figure 5 As shown, when the outer edge of the RF antenna 21 is rectangular, adjusting the width W (i.e., the length of the second arm 211B) and length L (i.e., the length of the first arm 211A) of the outer edge of the RF antenna 21 can adjust the imaginary part of the first antenna assembly 20. Figure 3 As shown, within a limited space, adjusting the length L1 and width W1 of the impedance matching patch 212 on the second surface 102 further ultimately adjusts the imaginary impedance, achieving conjugate of the imaginary impedance with that of the RF chip 30. Figure 2 and Figure 5As shown, by changing the coupling gap widths d1 and d2 between the RF antenna 21 and the energy-collecting antenna 22, a suitable real impedance can be adjusted, thereby making the real and imaginary impedances of the RF chip 30 conjugate simultaneously. The integration of the RF antenna 21 and the energy-collecting antenna 22 reduces the antenna size, while enabling the antenna to perform well and achieve the functions of RF energy collection and circuit activation.

[0063] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A wireless communication device, characterized in that, It includes a substrate, and a first antenna assembly, a radio frequency chip, a power acquisition module, and a load module, all disposed on the substrate; The first antenna assembly includes a radio frequency antenna and a power acquisition antenna. The radio frequency antenna is connected to the radio frequency chip and coupled to the power acquisition antenna for radio frequency communication. The power acquisition antenna is used to couple radio frequency signals to generate electrical signals. The energy harvesting module is connected to the energy harvesting antenna and the load module, and is used to generate a start signal according to the electrical signal. The load module is used to start according to the start signal.

2. The wireless communication device as described in claim 1, characterized in that, The energy-collecting antenna includes an energy-collecting arm, a bent arm, and a coupling arm, all arranged on the first surface of the substrate; the energy-collecting arm is located on one side of the radio frequency antenna; the first end of the bent arm is connected to the energy-collecting arm, and the second end is connected to the coupling arm, located between the radio frequency antenna and the energy-collecting arm; the coupling arm is disposed along a portion of the edge of the radio frequency antenna and has a coupling gap with the radio frequency antenna.

3. The wireless communication device as described in claim 2, characterized in that, The energy-collecting arm is a rectangular radiator used to adjust the impedance, bandwidth, and efficiency of the energy-collecting antenna; and / or The bent arm is a serpentine microstrip line used to adjust the imaginary impedance of the energy-collecting antenna.

4. The wireless communication device as described in claim 2, characterized in that, The coupling arm includes a first microstrip line segment and a second microstrip line segment. The first end of the first microstrip line segment is connected to the second end of the bent arm, the second end of the first microstrip line segment is connected to the first end of the second microstrip line segment, and the second end of the second microstrip line segment is connected to the energy harvesting module.

5. The wireless communication device according to any one of claims 1 to 4, characterized in that, The radio frequency antenna includes a ring radiator disposed on a first surface of the substrate and an impedance matching patch disposed on a second surface of the substrate. The first surface and the second surface are disposed opposite to each other. The orthographic projection of the ring radiator on the second surface at least partially coincides with the impedance matching patch. A coupling gap exists between a portion of the ring radiator and a portion of the energy-collecting antenna.

6. The wireless communication device according to any one of claims 1 to 4, characterized in that, The energy harvesting module includes a matching network and a voltage multiplier circuit. The matching network is connected to the energy harvesting antenna and is used to receive, store, and release the voltage signal output by the energy harvesting antenna. The voltage multiplier circuit is connected to the matching network and is used to boost the voltage signal and output the start signal.

7. The wireless communication device as described in claim 6, characterized in that, The matching network includes a first resistor, a first inductor, a first capacitor, and a second inductor. The first end of the first resistor is connected to the energy-collecting antenna, the second end of the first resistor is connected to the first end of the first inductor and the first end of the first capacitor, the second end of the first inductor is grounded, the second end of the first capacitor is connected to the first end of the second inductor, and the second end of the second inductor is connected to the voltage doubler circuit. The voltage multiplier circuit includes a three-terminal Schottky diode and a second capacitor. The Schottky diode includes a first Schottky diode and a second Schottky diode. The anode of the first Schottky diode is grounded. The cathode of the first Schottky diode is connected to the anode of the second Schottky diode and the second terminal of the second inductor. The cathode of the second Schottky diode is connected to the first terminal of the second capacitor and serves as the output terminal of the voltage multiplier circuit. The second terminal of the second capacitor is grounded.

8. The wireless communication device according to any one of claims 1 to 4, characterized in that, The load module includes a communication antenna, and a Bluetooth chip and / or a star flash chip connected to the communication antenna.

9. An electronic tag, characterized in that, include: Battery module; The wireless communication device according to any one of claims 1 to 8, wherein the load module of the wireless communication device is connected to the battery module, and the load module includes a communication module.

10. The electronic tag as described in claim 9, characterized in that, The battery module includes a flexible battery, the substrate of the wireless communication device includes a flexible substrate, and the electronic tag is rollable.

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