A non-contact communication module, an auxiliary communication antenna, and a device

Abstract

The embodiment of the specification provides a non-contact communication module, an auxiliary communication antenna and equipment. The scheme comprises: the communication module comprises a communication antenna, a communication chip and an auxiliary communication antenna; wherein the communication antenna is connected with the communication chip; the auxiliary communication antenna is independent of the communication antenna and is located on the side of the communication antenna close to the communication equipment which performs non-contact communication with the communication module; the auxiliary communication antenna presents negative magnetic resistance in the working frequency range of the communication antenna; at least part of the projection of the auxiliary communication antenna is located in the area where the communication antenna is located.

Description

Technical Field

[0001] This specification relates to one or more embodiments in the field of contactless communication technology, and particularly to a contactless communication module. This specification also relates to an auxiliary communication antenna and a non-contact communication device. Background Technology

[0002] Contactless communication technologies such as NFC (Near Field Communication) and RFID (Radio-Frequency Identification) have been widely used in many fields such as identity authentication, mobile payment, access control, logistics tracking, asset management, smart manufacturing, and smart homes due to their contactless, convenient, and efficient characteristics, which greatly improves the efficiency of information interaction and user experience.

[0003] The core working principle of NFC and RFID systems relies on the radio frequency electromagnetic field generated by the reader to provide the energy required for the tag or card to operate, and to achieve bidirectional or unidirectional data transmission by modulating this electromagnetic field. This energy coupling method has a problem for passive devices operating at high frequencies (such as 13.56MHz NFC and HF RFID) and ultra-high frequencies (such as 860-960MHz UHF RFID): the signal energy attenuates sharply with distance, and their effective working distance is usually limited to a few centimeters (such as NFC) to a few meters (such as UHF RFID).

[0004] Therefore, there is a need to provide an efficient and practical signal enhancement solution to overcome existing physical limitations and meet broader and more convenient application requirements. Summary of the Invention

[0005] In view of this, one or more embodiments of this specification provide a contactless communication module, an auxiliary communication antenna, and a device for enhancing the signal of contactless communication.

[0006] According to a first aspect of one or more embodiments of this specification, a contactless communication module is provided, the communication module including a communication antenna, a communication chip, and an auxiliary communication antenna; the communication antenna is connected to the communication chip; the communication chip is used to acquire energy sensed by the communication antenna and transmit information back; the auxiliary communication antenna is independent of the communication antenna and is located on the side of the communication antenna close to the communication device that performs contactless communication with the communication module; the auxiliary communication antenna exhibits negative magnetoresistance within the operating frequency range of the communication antenna; at least a portion of the projection of the auxiliary communication antenna is located in the region where the communication antenna is located.

[0007] According to a second aspect of one or more embodiments of this specification, an auxiliary communication antenna is provided, comprising a plurality of turns of metal coil; the auxiliary communication antenna exhibits negative magnetoresistance within a preset frequency range; the preset frequency range is the operating frequency of a first contactless communication device using the auxiliary communication antenna; the auxiliary communication antenna is used to be fixed to the side of the first contactless communication device closer to a second contactless communication device; the second contactless communication device is a means for performing contactless communication with the first contactless communication device; at least a portion of the projection of the auxiliary communication antenna is located in the area where the communication antenna of the first contactless communication device is located.

[0008] According to a third aspect of one or more embodiments of this specification, a contactless communication device is provided, the device including the aforementioned contactless communication module, or including the aforementioned auxiliary communication antenna.

[0009] One embodiment of this specification can achieve at least the following beneficial effects: by using an auxiliary communication antenna in the contactless communication module, and the auxiliary communication antenna exhibiting negative magnetoresistance characteristics within the operating frequency range of the communication antenna in the contactless communication module, the auxiliary communication antenna can reduce the magnetoresistance of the contactless communication module, increase the mutual inductance coefficient of the contactless communication module, thereby increasing the signal strength and the effective operating distance of the communication module. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of a contactless communication module provided in one embodiment of this specification;

[0012] Figure 2 This is a schematic diagram of a communication process with negative equivalent magnetoresistive force provided as an embodiment of this specification;

[0013] Figure 3 This is a schematic diagram of the structure of an auxiliary communication antenna provided in one embodiment of this specification;

[0014] Figure 4 This is a schematic diagram of the structure of an auxiliary communication antenna provided in one embodiment of this specification;

[0015] Figure 5 This is a schematic diagram of the structure of an existing NFC communication tag;

[0016] Figure 6 A schematic diagram of the structure of an NFC communication tag including a negative magnetoresistive auxiliary communication antenna, provided for one embodiment of this specification;

[0017] Figure 7 To adopt Figure 5 A schematic diagram of the S21 parameters of the NFC system for the NFC communication tag shown;

[0018] Figure 8 To adopt Figure 6 A schematic diagram of the S21 parameters of the NFC communication tag NFC system including a negative magnetoresistive auxiliary communication antenna;

[0019] Figure 9 This is a schematic diagram of the surface magnetic field distribution of an auxiliary communication antenna provided in one embodiment of this specification. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0021] This specification uses specific terms to describe embodiments thereof. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of those different embodiments or examples, without contradiction.

[0022] The terminology used in one or more embodiments of this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the one or more embodiments of this specification. The singular forms “a,” “an,” “an,” “the,” and “the” as used in one or more embodiments of this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in one or more embodiments of this specification includes any or all possible combinations of one or more associated listed items.

[0023] The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, product, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, product, or apparatus. Without further limitation, the presence of additional identical or equivalent elements in the process, method, product, or apparatus that includes said elements is not excluded.

[0024] Although the terms "first," "second," etc., may be used to describe various information in one or more embodiments of this specification, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, "first" may also be referred to as "second," and similarly, "second" may also be referred to as "first," without departing from the scope of one or more embodiments of this specification. Ordinal numbers such as "first," "second," etc., do not necessarily indicate order; often they are used to facilitate the distinction of objects. For example, "first server" and "second server" usually refer to two servers. To distinguish these two servers, they are described as "first server" and "second server." Of course, sometimes these two servers may be the same server.

[0025] The word "if" used in one or more embodiments of this specification may be interpreted as "when", "when", or "in response to a determination".

[0026] In this specification, unless explicitly stated otherwise, "receiving and sending data" does not necessarily mean direct receiving and sending; it can also mean indirect receiving and sending. For example, A receiving data sent by B can be understood as A directly receiving the data sent by B, or it can be understood as A indirectly receiving the data sent by B through other entities such as C. Similarly, B sending data to A can be understood as B sending the data directly to A, or it can be understood as B indirectly sending the data to A through other entities such as C. Here, C can be one entity, or it can be two or more entities.

[0027] In this specification, unless explicitly stated otherwise, the relationships between structures can be direct or indirect. For example, when describing "A is connected to B," unless it is explicitly stated that A and B are directly connected, it should be understood that A can be directly connected to B or indirectly connected to B. Similarly, when describing "A is on top of B," unless it is explicitly stated that A is directly above B (AB is adjacent and A is above B), it should be understood that A can be directly above B or indirectly above B (AB is separated by other elements, and A is above B). And so on.

[0028] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in one or more embodiments of this specification are all information and data authorized by the user or fully authorized by all parties. The collection, use and processing of related data shall comply with the relevant laws, regulations and standards of the relevant regions, and corresponding operation entry points shall be provided for users to choose to authorize or refuse.

[0029] The following explains the terms and concepts used in one or more embodiments of this specification.

[0030] Contactless communication refers to the technology that allows two devices to exchange and communicate data over short distances without physical connection or contact, using media such as radio waves, electromagnetic waves, or light waves. Examples include NFC (Near-Field Communication), RFID (Radio-Frequency Identification), Bluetooth, Wi-Fi, and Zigbee.

[0031] NFC (Near Field Communication) is a short-range wireless communication technology with a typical operating distance of less than 10cm, used in scenarios such as mobile payments, access control cards, and public transport cards. In NFC, the device that actively transmits signals can be called the master device or the transmitting device, such as an NFC card reader or a device in card reader mode. The device that passively responds to the signals transmitted by the master device can be called the slave device or the target device, such as an NFC tag, a device in card emulation mode, or a device with an NFC tag.

[0032] RFID (Radio Frequency Identification) is a type of automatic identification technology that uses wireless radio frequency for non-contact, two-way data communication. It reads and writes data to a recording medium (electronic tag or RFID card) to achieve target identification and data exchange. Examples include anti-theft tags on supermarket goods and tracking tags on logistics packages, which can be identified without physical contact.

[0033] Passive systems: Devices without a built-in power supply that must rely on external devices (such as card readers) to provide power in order to operate.

[0034] Negative permeability: refers to negative magnetic permeability. Magnetic permeability is a parameter that measures a material's "magnetic conductivity". Traditional materials have positive magnetic permeability, while materials with "negative magnetic permeability" will "repel" magnetic fields, just like like poles of a magnet repel each other, thus changing the way magnetic fields propagate.

[0035] Mutual inductance: Used to represent the energy transfer efficiency between two coils. When one coil is energized, how much energy can be induced in the other coil? The higher the mutual inductance, the higher the transfer efficiency.

[0036] Coupling coefficient: A parameter that measures the degree of magnetic field coupling between two coils. The value is between 0 and 1. The closer it is to 1, the better the magnetic field "matching" between the two coils is, and the higher the energy transfer efficiency is.

[0037] Resonant frequency: The frequency at which a circuit composed of a coil and a capacitor naturally vibrates. When the frequency of an external signal equals the resonant frequency, the circuit will produce the strongest response.

[0038] S21 parameter: In the field of radio frequency, this is an indicator of the efficiency of signal transmission from the transmitter to the receiver, measured in decibels (dB). The larger the S21 value (the closer it is to 0), the less signal attenuation and the higher the transmission efficiency.

[0039] The technical solutions provided in the various embodiments of this specification are described in detail below with reference to the accompanying drawings.

[0040] Figure 1 This is a schematic diagram of a contactless communication module provided in one embodiment of this specification. Figure 1 The communication module may include a communication antenna 102, a communication chip 104, and an auxiliary communication antenna 106.

[0041] The communication antenna 102 is connected to the communication chip 104; the communication chip 104 is used to acquire the energy sensed by the communication antenna 102 and transmit the information back.

[0042] The communication chip 104 can be an NFC communication chip, RFID communication chip, or other chip capable of processing radio frequency signals sensed by the communication antenna 102. For example, the communication chip may have communication functions and a certain computing capability, or it may include encryption logic circuits and encryption or decryption modules to enhance the security of data transmission. The communication chip may include power supply circuits, power conversion circuits, communication interface circuits, oscillation circuits, etc., to achieve contactless communication.

[0043] The communication antenna 102 can be an antenna for receiving or transmitting radio frequency signals, and can be in the form of a metal coil or a coiled structure in the form of a metal sheet.

[0044] In practical applications, communication antennas and communication chips can serve as the main components of contactless communication devices. The communication antenna and communication chip work together to achieve contactless communication. Examples include NFC tags, NFC cards, NFC tag devices, NFC card readers, and so on, all of which incorporate communication antennas and communication chips.

[0045] The auxiliary communication antenna 106 can serve as an auxiliary communication unit, operating independently of the aforementioned communication antenna 102 and not necessarily connected to the communication chip 104. The auxiliary communication antenna 106 can exist independently. If the contactless communication module includes this auxiliary communication antenna, the signal strength during communication can be stronger, resulting in more stable communication. Even without this auxiliary communication antenna, communication can still be achieved, but the signal strength will be relatively lower compared to when the auxiliary communication antenna is present. The auxiliary communication antenna 106 can be a passive antenna, capable of magnetic coupling with the communication antenna, using negative magnetoresistance to enhance the signal strength of the communication antenna.

[0046] To enable the auxiliary communication antenna 106 to more accurately enhance the signal strength of the communication antenna 102, the auxiliary communication antenna 106 can be placed on the side of the communication antenna closer to the communication device that performs contactless communication with the communication module, and at least a portion of the projection of the auxiliary communication antenna can be located within the area of ​​the communication antenna. The projection can represent an orthographic projection, the projection of the auxiliary communication antenna can represent the projection of the area where the auxiliary communication antenna is located, or it can represent the projection of the area encompassed by the outer contour of the auxiliary communication antenna. The auxiliary communication antenna can include a helical coil structure, with a certain spacing between the coils, and the projection of the auxiliary communication antenna can include the portion of the spacing between the coils. For example, during contactless communication, the area above the communication antenna in the communication module is the communication area, and the interacting device can communicate with the communication module by approaching the area above the communication antenna. In this case, the auxiliary communication antenna can be attached to or placed above the communication antenna. The auxiliary communication antenna can cover the entire communication antenna or a portion of the communication antenna.

[0047] The auxiliary communication antenna 106 can exhibit negative magnetoresistance within the operating frequency range of the communication antenna 104. This reduces the overall magnetoresistance of the communication module during communication, thereby increasing the mutual inductance coefficient of the communication module and improving signal strength.

[0048] Figure 2 This diagram illustrates a communication process using negative equivalent magnetoresistive (NEM) as an embodiment of this specification. The communication module described above is used as the passive party in the communication, such as an NFC tag, for example. The communication antenna in the communication module is equivalent to a receiving antenna used to receive radio frequency signals emitted by the transmitting antenna of the active party. Figure 2 As shown, from the perspective of the communication path, the auxiliary communication antenna can be located between the transmitting antenna and the receiving antenna. It can be used to reduce the magnetic resistance during the communication process and improve the mutual inductance between the receiving antenna and the transmitting antenna.

[0049] The total magnetic reluctance in a traditional communication system is the total environmental magnetic reluctance between the transmitting antenna and the passive tag antenna, such as the receiving antenna. This is typically the magnetic reluctance caused by air, and can be expressed as... After adding an auxiliary communication antenna with negative magnetic characteristics, the total magnetoresistance is updated to... ,in This causes the mutual inductance coefficient M to increase in the opposite direction, thereby increasing the transmission efficiency.

[0050] This explanation uses an antenna with a coil as the auxiliary communication antenna as an example. In practical applications, the negative equivalent magnetoresistance originates from the negative equivalent permeability at the operating frequency, and the coil's equivalent permeability... It can be expressed by formula (1):

[0051]

[0052] Where L is the equivalent inductance of the coil, and V is the volume of the coil. The resonant frequency, For operating frequency, For coil resistance, This represents the cross-sectional area of ​​the coil.

[0053] The equivalent magnetic reluctance of the coil and The relationship between them can be expressed by formula (2):

[0054]

[0055] in This represents the length of the coil.

[0056] The mutual inductance coefficient M can be expressed by formula (3):

[0057]

[0058] Where N is the number of turns in the coil.

[0059] Transmission efficiency It is positively correlated with mutual induction, that is Therefore, a specific operating frequency can be achieved by adjusting... Parameters such as these determine the operating frequency of the coil. Approaching the resonant frequency ,at this time When the value is negative, the equivalent magnetic reluctance of the coil is... The value is negative, thus making the mutual inductance negative. As the coefficient increases, the final transmission efficiency decreases. They were promoted.

[0060] In practical applications, an auxiliary communication antenna can be determined based on the specifications of the communication antenna, such as its operating frequency, size, and shape. The resonant frequency of the auxiliary communication antenna can be the same as or close to the operating frequency of the communication antenna. Furthermore, at the operating frequency of the communication antenna, the auxiliary communication antenna can exhibit negative magnetoresistance characteristics.

[0061] The operating frequency at which the auxiliary communication antenna exhibits negative magnetoresistance can be detected using some measuring or testing tools. By adjusting parameters such as the number of coil turns, line spacing, and capacitance of the auxiliary antenna, the operating frequency at which the auxiliary communication antenna exhibits negative magnetoresistance characteristics can be adjusted. The matching auxiliary communication antenna can be determined according to the actual application scenario.

[0062] In practical applications, the number of coil turns is positively correlated with inductance and negatively correlated with resonant frequency; the more turns a coil antenna has, the greater its inductance and the lower its resonant frequency. The coil spacing is positively correlated with resonant frequency; the greater the coil spacing, the higher the resonant frequency. The coil width is negatively correlated with inductance and positively correlated with resonant frequency; the greater the coil width, the smaller the inductance and the higher the resonant frequency. By adjusting the number of coil turns, coil width, coil spacing, and coil length, an auxiliary antenna can exhibit negative magnetoresistance characteristics within a certain operating frequency range. If the auxiliary antenna contains a capacitor, the capacitance value is negatively correlated with the resonant frequency; adjusting or selecting a suitable capacitance value can also achieve negative magnetoresistance characteristics within a certain operating frequency range.

[0063] In one embodiment of this specification, an auxiliary communication antenna with negative magnetoresistance characteristics is applied in a contactless communication module, such as for passive NFC and RFID radio frequency tags, which can enhance the signal of the communication antenna of the communication module and improve its working stability.

[0064] In practical applications, the resonant frequency of an auxiliary communication antenna can be obtained by adjusting the antenna's inductance, capacitance, resistance, and other parameters to meet the operating frequency of the communication antenna and to achieve negative magnetoresistance at that operating frequency.

[0065] As one implementation method, the auxiliary communication antenna can be a simple metal coil or a ring-shaped metal sheet. For example, it can be a spiral metal coil, and the two ends of the metal coil can be connected to each other to form a closed-loop coil.

[0066] In practical applications, the number of coil turns is positively correlated with inductance and negatively correlated with resonant frequency; the more turns a coil antenna has, the greater its inductance and the lower its resonant frequency. The coil spacing is positively correlated with resonant frequency; the greater the coil spacing, the higher the resonant frequency. The coil width is negatively correlated with inductance and positively correlated with resonant frequency; the greater the coil width, the smaller the inductance and the higher the resonant frequency.

[0067] By adjusting the number of coil turns, coil width, wire spacing, and coil length, an auxiliary communication antenna that matches the communication antenna can be obtained.

[0068] In another implementation, the auxiliary communication antenna may include a metal coil and a capacitor element; the capacitor element may be connected in series with the metal coil.

[0069] Figure 3 This is a schematic diagram of an auxiliary communication antenna provided as an embodiment of this specification. Figure 3 As shown, the auxiliary communication antenna may include a metal coil 302 and a capacitor element 304. The capacitor element 304 is connected in series within the metal coil 302. The metal coil 302 can be obtained by spirally winding one or more metal wires connected together according to a preset rule. The metal coil 302 has two connection ends: one end can be connected to one end (e.g., the positive terminal) of the capacitor element 304, and the other end can be connected to the other end (e.g., the negative terminal) of the capacitor element 304, thus forming a closed-loop structure with the metal coil and the capacitor element. The capacitor element 304 can be a fixed capacitor element or an adjustable capacitor element.

[0070] like Figure 3 As shown, the auxiliary communication antenna has 3 coil turns. From the inside out, the first coil has 3 turns, the second coil has 4 turns, and the third coil has 5 turns. The distance between each coil represents the coil spacing; the distance between the turns within a coil represents the line spacing; the width of a coil represents its width, which can be related to factors such as the number of turns, line spacing, and line radius.

[0071] In practical applications, the auxiliary communication antenna may include a coil antenna, or may include a coil antenna. Optionally, in one embodiment of this specification, the auxiliary communication antenna may include an antenna array consisting of m×n sub-antennas; where m and n are positive integers; and each of the sub-antennas is independent of the others.

[0072] The specifications of each sub-antenna, such as the number of coil turns, line spacing, line width, and dimensions, can be the same. For example, after determining the specifications of one sub-antenna, multiple sub-antennas of that specification can be selected to construct an auxiliary communication antenna. Alternatively, the specifications of each sub-antenna can be different, or at least partially different. For example, the specifications of a row or column near the edge may differ from those of the sub-antennas near the center. There are no strict rules governing the individual sub-antennas, as long as they effectively enhance the signal of the communication antenna.

[0073] Figure 4 This is a schematic diagram of an auxiliary communication antenna provided as an embodiment of this specification. Figure 4 As shown, the auxiliary communication antenna may include nine sub-antennas 402 arranged in a 3x3 grid. These nine sub-antennas may be independent of each other. Each sub-antenna, or at least some of the sub-antennas, may be a pure metal coil, or may be an antenna containing a metal coil and a capacitor element. Figure 4 As shown, at least one of the sub-antennas may include a metal coil 404 and a capacitor element 406, with the capacitor element 406 connected in series with the metal coil 404. The capacitor element 406 may be a fixed capacitor element or an adjustable capacitor element.

[0074] If the auxiliary communication antenna comprises multiple sub-antennas, each sub-antenna may have an adjustable capacitor element or a fixed capacitor element; or it may have some fixed capacitor elements and some adjustable capacitor elements. The sub-antennas may be located in the same plane or in different planes.

[0075] To facilitate matching with communication antennas of different specifications, at least one of the sub-antennas can be detachably fixed to the base plate. This allows for the selection of an appropriate number of sub-antennas to assemble an auxiliary communication antenna that matches the specifications of the communication antenna, such as its size. The base plate of the auxiliary communication antenna can be made of a thinner material to reduce its impact on the signal, or the communication antenna can be used as the ground plane for the auxiliary communication antenna, with the auxiliary communication antenna directly fixed above the communication antenna.

[0076] In practical applications, the auxiliary communication antenna can be an internal component of the communication module. Both the auxiliary and main communication antennas can be located within the communication module. For example, if the contactless communication module is the communication module within an NFC tag, the NFC tag internally encapsulates a communication antenna, a communication chip, and an auxiliary communication antenna. The auxiliary communication antenna can be located above the main communication antenna, closer to the side of the NFC tag that is being touched. Similarly, for electronic devices with a contactless communication module, the electronic device can internally contain a communication antenna, a communication chip, and an auxiliary communication antenna. The auxiliary communication antenna can also be located above the main communication antenna, closer to the side of the electronic device that is being touched.

[0077] Alternatively, the auxiliary communication antenna can be a separate component, which can be glued or otherwise fixed to the outer surface of the communication module. For example, if the contactless communication module is the communication module in an NFC tag, the NFC tag may contain a communication antenna and a communication chip, and an auxiliary communication antenna may be fixed to the outer surface of the NFC tag. Similarly, for an electronic device with a contactless communication module, the electronic device may contain a communication antenna and a communication chip, and an auxiliary communication antenna may be fixed to the communication area of ​​the electronic device on its outer surface.

[0078] For existing or already-in-use contactless communication tags, devices, and electronic devices with communication antennas and chips, if the auxiliary communication antenna provided in one embodiment of this specification is an independent component, it can be used to improve existing or already-in-use tags, devices, and electronic devices, thereby enhancing their communication performance. This eliminates the need to modify the original tags, devices, and electronic devices; a matching auxiliary communication antenna can be attached to or otherwise fixed to the outer surface of the original device, making it more practical.

[0079] The above Figure 4 This is just a schematic diagram of an auxiliary communication antenna. In practical applications, the number of sub-antennas and their shapes can be set according to actual needs. The parameters of each sub-antenna can be the same or different, such as the number of coils, the number of coil turns, and the spacing between the lines. There are no restrictions here.

[0080] As one implementation method, to facilitate the combination into an auxiliary communication antenna suitable for use with various communication antennas, the outer contour of the sub-antenna can be polygonal, such as a square, rectangle, triangle, trapezoid, etc. This allows the auxiliary communication antenna, mainly composed of individual sub-antennas, to cover the area of ​​the communication antenna or a designated area, facilitating flexible configuration.

[0081] In practical applications, the shape of the sub-antenna can also be selected according to the shape of the communication antenna. For example, if the communication antenna is square, the sub-antenna can also be square, or the sub-antenna can be a rectangle, triangle, etc. that can be combined to form a square.

[0082] This explanation uses NFC communication tags as an example. Figure 5 This is a schematic diagram of the structure of an existing NFC communication tag. Figure 5 As shown, the NFC communication tag has a communication antenna and a control chip, and may also include other components such as capacitors and resistors.

[0083] Figure 6 This is a schematic diagram of the structure of an NFC communication tag including a negative magnetoresistive assisted communication antenna, provided as an embodiment of this specification. Figure 6 The NFC communication tag shown can be in Figure 5 The label shown is based on an auxiliary communication antenna with negative magnetoresistance characteristics, such as... Figure 6 A 3x3 structure with nine small coil antennas.

[0084] Figure 7 To adopt Figure 5 The diagram shows the S21 parameters of the NFC system for the NFC communication tag. Figure 8 To adopt Figure 6 A schematic diagram of the S21 parameters of the NFC communication tag NFC system including a negative magnetoresistive assisted communication antenna. The horizontal axis represents the operating frequency, and the vertical axis represents the value of S21.

[0085] like Figure 7 As shown, in the 13.56MHz scenario, the NFC system S21 without the negative magnetoresistive auxiliary communication antenna has a latency of approximately -3.257dB. In the 13.56MHz scenario, the NFC system S21 with the negative magnetoresistive auxiliary communication antenna has a latency of approximately -2.218dB, representing an improvement of about 1dB. Figure 7 and Figure 8 As can be seen from the S21 parameters shown, the negative magnetoresistive assisted communication antenna provided in the embodiments of this specification can effectively improve the communication effect.

[0086] In order to enable the negative magnetoresistance-assisted communication antenna to function more effectively as the communication antenna, as one implementation method, the outer contour of the auxiliary communication antenna can match the outer contour of the communication antenna.

[0087] For example, the overall shape of the auxiliary communication antenna can be roughly the same as that of the communication antenna, and the outer contour of the auxiliary communication antenna can coincide with the outer contour of the communication antenna; or, the auxiliary communication antenna can be slightly larger or smaller than the communication antenna, and the outer contour of the auxiliary communication antenna is outside or inside the outer contour of the communication antenna.

[0088] In one implementation, the coverage of the auxiliary communication antenna relative to the communication antenna can be greater than or equal to a preset threshold. For example, the auxiliary communication antenna can completely cover the communication antenna, or it can cover a portion of the communication antenna.

[0089] If signal enhancement is required for a portion of the communication antenna, the outer contour of the auxiliary communication antenna may not match the outer contour of the communication antenna; the auxiliary communication antenna may overlap with the projection of a portion of the communication antenna.

[0090] As one implementation method, the auxiliary communication antenna may include a metal with a conductivity greater than or equal to 100 Siemens per meter. For example, a communication antenna can be obtained by processing a metal wire or metal sheet with a conductivity greater than or equal to 100 Siemens per meter according to certain rules.

[0091] In practical applications, the metal coil of an auxiliary communication antenna can be obtained by winding a metal wire in a planar spiral shape. The metal coil of the auxiliary communication antenna includes a planar spiral metal wire.

[0092] For example, the metal coil of the auxiliary communication antenna can also be obtained by winding the metal coil in a spiral upward manner. The metal coil of the auxiliary communication antenna can be a coil with a certain height, and the coils of each turn can be located in the same plane or not in the same plane.

[0093] In one embodiment of this specification, the auxiliary communication antenna may be an adjustable antenna parameter. Optionally, the auxiliary communication antenna may include an adjustable capacitor element, and the communication module may include a control module capable of controlling the capacitance value of the adjustable capacitor element in the auxiliary communication antenna.

[0094] The control module can be the aforementioned communication chip, or it can be a control unit other than the communication chip, such as an MCU (Microcontroller Unit), MPU (Microprocessor Unit), or FPGA (Field-Programmable Gate Array) or other units with control processing capabilities.

[0095] The control module can be connected to the adjustable terminal of the adjustable capacitor element, and can adjust the capacitance value of the adjustable capacitor element according to control commands, either increasing or decreasing it. The control commands can be sent manually to the control module via operable components such as buttons, knobs, or operation panels; alternatively, the control module or communication chip can have the function of detecting radio frequency signals, allowing the control module to generate control commands based on the detected signal strength, or the communication chip to generate control commands based on signal strength and other information and send them to the control module.

[0096] The communication module in one embodiment of this specification may further include a detection module for detecting external radio frequency signals, such as nearby interference signals. When the detection module detects an interference signal or an interference signal from a certain direction whose intensity exceeds a preset interference threshold, it can generate a trigger command. The control module can then adjust the capacitance value of the adjustable capacitor element according to the trigger command and preset control rules to reduce the interference received by the contactless communication module.

[0097] In one implementation, if the communication module receives an interference signal in a preset direction, the control module can adjust the capacitance value of the adjustable capacitor element of one or more sub-antennas in the antenna array that are close to the preset direction, so that the resonant frequency of the one or more sub-antennas deviates from the operating frequency of the communication antenna, or so that the one or more sub-antennas exhibit positive magnetoresistance within the operating frequency range of the communication antenna.

[0098] The preset direction can be relative to the communication module, such as left, right, front, or rear of the communication module. Interference signals may be generated due to the presence of other contactless communication devices near the communication module. For example, if the communication module is used as an NFC tag device, and another device is nearby acting as a card reader, that device will continuously emit radio frequency (RF) signals. However, the communication module will not continuously receive RF signals for extended periods during actual business processing. If a user's mobile phone interacts with the device containing the communication module as a card reader, the user will move their phone away from the device after completing the transaction and will not remain nearby. If the communication module continuously senses RF signals for a prolonged period, this signal can be considered interference, indicating the presence of an interference source near the communication module. The location of the interference source can also be determined by analyzing the intensity of the interference signals at various locations; the interference intensity will be stronger closer to the interference source.

[0099] The aforementioned preset direction can represent the direction of the interference source. If the auxiliary communication antenna contains multiple sub-antennas, the control module can adjust the capacitance value of the sub-antenna closest to the interference source, so that the resonant frequency of the sub-antenna deviates from the operating frequency of the communication antenna, or so that the sub-antenna exhibits positive magnetoresistance within the operating frequency range of the communication antenna, thereby reducing the interference signal sensed by the communication module.

[0100] This explanation uses NFC communication tags as an example. Figure 9 This diagram illustrates the surface magnetic field distribution of an auxiliary communication antenna according to one embodiment of this specification. In this diagram, red represents regions with a positive magnetic field, green represents regions with a zero magnetic field, and blue represents regions with a negative magnetic field. A positive magnetic field indicates that the auxiliary communication antenna can enhance the signal of the original communication antenna, while a negative magnetic field indicates that the auxiliary communication antenna weakens the signal of the original communication antenna.

[0101] like Figure 9As shown, the left-hand magnetic field distribution diagram illustrates the surface magnetic field distribution of an auxiliary communication antenna containing nine sub-antennas. The upper right-hand magnetic field distribution diagram shows the magnetic field distribution after adjusting the capacitance of one sub-antenna in the lower right corner of the nine sub-antennas. This sub-antenna's resonant frequency deviates from 13.56MHz, or it no longer exhibits negative magnetoresistance characteristics within the 13.56MHz frequency range. The other eight antennas maintain a resonant frequency of 13.56MHz and exhibit negative magnetoresistance characteristics. The lower right-hand magnetic field distribution diagram shows the magnetic field distribution after adjusting the capacitance of one row of sub-antennas in the auxiliary communication antenna. This row of sub-antennas also deviates from 13.56MHz in resonant frequency, or it no longer exhibits negative magnetoresistance characteristics within the 13.56MHz frequency range. The other two rows of sub-antennas still maintain a resonant frequency of 13.56MHz and exhibit negative magnetoresistance characteristics.

[0102] In practical applications, the field distribution of each sub-antenna in the auxiliary communication antenna can be adjusted according to actual needs. If multiple sub-antennas need to be adjusted, they can be adjusted one by one, or two or more sub-antennas can be adjusted simultaneously. For example, an auxiliary communication antenna with negative magnetoresistance characteristics can be used in non-contact working areas to improve communication efficiency, or the received interference signal can be weakened by adjusting the resonant frequency or magnetoresistance characteristics of the sub-antennas in the direction of interference.

[0103] Considering practical applications, when NFC or RFID devices are used in a certain environment, their performance at the preset operating frequency may not be ideal due to external environmental factors. The actual operating frequency that meets actual business needs (e.g., achieving a preset success rate for interactions) may deviate from the preset operating frequency. To address this, in this embodiment, the auxiliary communication antenna can be adjusted to adapt to the actual operating frequency. Optionally, if the actual operating frequency of the communication module deviates from the preset operating frequency, the control module can adjust the capacitance value of the adjustable capacitor element so that the difference between the resonant frequency of the auxiliary communication antenna and the actual operating frequency is less than a preset threshold, and the auxiliary communication antenna exhibits negative magnetoresistance within the range of the actual operating frequency.

[0104] The preset operating frequency can represent the theoretical operating frequency or the communication frequency determined according to the communication protocol adopted by the communication module. For example, in the NFC near-field communication scenario, the preset operating frequency is 13.56MHz. The actual operating frequency can represent the operating frequency at which the business can be processed normally, such as the ability to communicate with other contactless communication devices, or a communication success rate of more than 95% with other contactless communication devices.

[0105] If the actual operating frequency of the communication antenna deviates from the preset operating frequency, the capacitance value of the auxiliary communication antenna can be adjusted to match the actual operating frequency of the communication antenna.

[0106] As described above, the control module can adjust the capacitance value of the auxiliary communication antenna according to the actual operating frequency of the communication antenna, so that the resonant frequency of the auxiliary communication antenna is consistent with or close to the actual operating frequency, and the auxiliary communication antenna exhibits negative magnetoresistance within the range of the actual operating frequency.

[0107] In one embodiment of this specification, for devices such as NFC and RFID, if the above-mentioned auxiliary communication antenna is used, the resonant frequency of the coil array can be adjusted by the capacitor connected in series with it, thereby achieving the signal enhancement function at the operating frequency. At the same time, the capacitance of each coil can be adjusted independently to achieve the function of editing the surface magnetic field of NFC, RFID and other devices.

[0108] In one embodiment of this specification, an auxiliary communication antenna with negative magnetoresistance characteristics can be used for passive NFC, RFID and other radio frequency tags, thereby enhancing the antenna signal and improving operational stability.

[0109] In one embodiment of this specification, the auxiliary communication antenna with negative magnetoresistance characteristics includes a coil array, which can be used for passive NFC, RFID and other radio frequency tags. Each coil is independently adjustable, and the magnetic field distribution on the tag surface can be dynamically adjusted according to different needs.

[0110] In practical applications, the aforementioned communication module can be a passive device for contactless communication, such as an NFC tag, an RFID tag, or a device in card emulation mode. Alternatively, the aforementioned communication module can also be an active device for contactless communication, such as a card reader device; this is not a limitation.

[0111] While this specification provides module structures as illustrated in the embodiments or diagrams, it is understood that the structures listed in the embodiments or diagrams are merely one of many structures and do not represent the only structural composition. The positions or components of some structures may be adjusted according to actual needs, or some components may be omitted.

[0112] The various technical features in the above embodiments can be combined arbitrarily, as long as there is no conflict or contradiction between the combinations of features. However, due to space limitations, they have not been described one by one. Therefore, the arbitrary combination of various technical features in the above embodiments is also within the scope of this specification.

[0113] Based on the same idea, this specification also provides an auxiliary communication antenna in its embodiments.

[0114] As mentioned above Figure 3As shown, the antenna may include a metal coil with a plurality of turns. The auxiliary communication antenna exhibits negative magnetic reluctance within a preset frequency range; the preset frequency range is the operating frequency of the first contactless communication device using the auxiliary communication antenna.

[0115] The auxiliary communication antenna can be fixed to the side of the first contactless communication device that is close to the second contactless communication device; the second contactless communication device is a device for contactless communication with the first contactless communication device.

[0116] Regarding the location of the auxiliary communication antenna, at least a portion of its projection may be located in the area where the communication antenna of the first contactless communication device is located.

[0117] Optionally, the auxiliary communication antenna may also include a capacitor element, which may be connected in series with a metal coil.

[0118] For ease of use, the auxiliary communication antenna can be encapsulated, for example, by using a plastic or other material film or housing to encapsulate the auxiliary antenna, resulting in a stand-alone component containing the auxiliary communication antenna.

[0119] For ease of subsequent use, at least one surface of the component may have an area that can be pasted or a area that can be fixed by means of clips or the like, so as to fix the component to the outer surface of the first contactless communication device.

[0120] Some specific structures or control methods can be described in the foregoing embodiments, and will not be repeated here.

[0121] It is understood that the modules mentioned above can be hardware modules, or they can refer to computer programs or program segments, used to perform one or more specific functions. Furthermore, the distinction between these modules does not mean that the actual program code must also be separate.

[0122] For ease of description, the above modules are described separately according to their functions, divided into various modules or units. Of course, when implementing one or more of this specification, the functions of each module or unit can be implemented in the same or different software and / or hardware, or a module that performs the same function can be implemented by a combination of multiple sub-modules or sub-units, etc. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0123] Based on the same idea, this specification also provides a contactless communication device, which may include the above-mentioned contactless communication module or the above-mentioned auxiliary communication antenna.

[0124] In practical applications, this contactless communication device may also include components such as a memory and a processor. The memory stores computer programs / instructions, and the processor executes these programs / instructions. When executed by the processor, the programs / instructions perform preset functions, such as adjusting the aforementioned auxiliary communication antenna.

[0125] Specifically, the components of this contactless communication device include, but are not limited to, a memory and a processor. The processor and memory are connected via a bus, and a database is used to store data.

[0126] The contactless communication device also includes an access device that enables the contactless communication device to communicate via one or more networks. Examples of such networks include Public Switched Telephone Network (PSTN), Local Area Network (LAN), Wide Area Network (WAN), Personal Area Network (PAN), or combinations of communication networks such as the Internet. The access device 440 may include one or more of any type of wired or wireless network interface (e.g., a network interface card (NIC)), such as an IEEE 802.11 Wireless Local Area Network (WLAN) wireless interface, a Wi-MAX (Worldwide Interoperability for Microwave Access) interface, an Ethernet interface, a Universal Serial Bus (USB) interface, a cellular network interface, a Bluetooth interface, a Near Field Communication (NFC) interface, and so on.

[0127] In one embodiment of this specification, the aforementioned components and other components of the contactless communication device may also be connected to each other, for example, via a bus.

[0128] Contactless communication devices can be any type of stationary or mobile computing device, including mobile computers or mobile computing devices (e.g., tablet computers, personal digital assistants, laptop computers, notebook computers, netbooks, etc.), mobile phones (e.g., smartphones), wearable computing devices (e.g., smartwatches, smart glasses, etc.) or other types of mobile devices, or stationary computing devices such as desktop computers or personal computers (PCs).

[0129] The technical solution of this contactless communication device belongs to the same concept as the aforementioned technical solutions of contactless communication modules or contactless communication antennas. Details not described in detail in the technical solution of the contactless communication device can be found in the descriptions of the technical solutions provided in the above embodiments. The process of contactless communication can also be found in related technologies.

[0130] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0131] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0132] In the 1990s, improvements to a technology could be clearly distinguished as either hardware improvements (e.g., improvements to the circuit structure of diodes, transistors, switches, etc.) or software improvements (improvements to methodology). However, with technological advancements, many methodological improvements today can be considered direct improvements to hardware circuit structures. Designers almost always obtain the corresponding hardware circuit structure by programming the improved methodology into the hardware circuit. Therefore, it cannot be said that a methodological improvement cannot be implemented using hardware physical modules. For example, a Programmable Logic Device (PLD) (such as a Field Programmable Gate Array (FPGA)) is such an integrated circuit whose logic function is determined by the user programming the device. Designers can program a digital system themselves to "integrate" it onto a PLD, without needing chip manufacturers to design and manufacture dedicated integrated circuit chips. Furthermore, nowadays, instead of manually manufacturing integrated circuit chips, this programming is mostly implemented using "logic compiler" software. Similar to the software compiler used in program development, the original code before compilation must also be written in a specific programming language, called a Hardware Description Language (HDL). There are many HDLs, such as ABEL (Advanced Boolean Expression Language), AHDL (Altera Hardware Description Language), Confluence, CUPL (Cornell University Programming Language), HDCal, JHDL (Java Hardware Description Language), Lava, Lola, MyHDL, PALASM, and RHDL (Ruby Hardware Description Language). Currently, the most commonly used are VHDL (Very-High-Speed ​​Integrated Circuit Hardware Description Language) and Verilog. Those skilled in the art should also understand that by simply performing some logic programming on the method flow using one of these hardware description languages ​​and programming it into an integrated circuit, the hardware circuit implementing the logical method flow can be easily obtained.

[0133] The controller can be implemented in any suitable manner. For example, it can take the form of a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro)processor, logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers. Examples of controllers include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicon Labs C8051F320. A memory controller can also be implemented as part of the control logic of the memory. Those skilled in the art will also recognize that, in addition to implementing the controller in purely computer-readable program code form, the same functionality can be achieved by logically programming the method steps to make the controller take the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, such a controller can be considered a hardware component, and the means included therein for implementing various functions can also be considered as structures within the hardware component. Alternatively, the means for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.

[0134] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, a computer can be, for example, a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.

[0135] For ease of description, the above devices are described separately by function as various units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0136] Those skilled in the art will understand that one or more embodiments of this specification can be provided as a method, system, or computer program product. Therefore, the invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0137] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0138] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0139] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0140] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0141] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0142] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital character versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0143] This application can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. This application can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0144] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A contactless communication module, the communication module comprising a communication antenna, a communication chip, and an auxiliary communication antenna; The communication antenna is connected to the communication chip; the communication chip is used to acquire the energy sensed by the communication antenna and transmit the information back. The auxiliary communication antenna is independent of the communication antenna and is located on the side of the communication antenna that is close to the communication device that communicates with the communication module in a non-contact manner; the auxiliary communication antenna exhibits negative magnetoresistance within the operating frequency range of the communication antenna; At least a portion of the projection of the auxiliary communication antenna is located in the area where the communication antenna is located; the auxiliary communication antenna covers the entire communication antenna or a portion of the communication antenna.

2. The communication module according to claim 1, wherein the auxiliary communication antenna includes a metal coil and a capacitor element; the capacitor element includes an adjustable capacitor element or a fixed capacitor element; The capacitor element is connected in series with the metal coil.

3. The communication module according to claim 1, wherein the auxiliary communication antenna comprises an antenna array consisting of m×n sub-antennas; m and n are positive integers; Each of the sub-antennas is independent of the others.

4. The communication module according to claim 3, wherein at least one of the sub-antennas includes a metal coil and a capacitor element, the capacitor element being connected in series with the metal coil; the capacitor element includes an adjustable capacitor element or a fixed capacitor element.

5. The communication module according to claim 3, wherein at least one of the sub-antennas is detachably fixed to the base plate; Alternatively, at least some of the said sub-antennas are located in the same plane.

6. The communication module according to claim 2 or 4, wherein if the capacitor element is an adjustable capacitor element, the communication module further includes a control module; The control module is used to control the capacitance value of the adjustable capacitor element.

7. According to claim 6, if the actual operating frequency of the communication module deviates from the preset operating frequency, the control module can adjust the capacitance value of the adjustable capacitor element so that the difference between the resonant frequency of the auxiliary communication antenna and the actual operating frequency is less than a preset threshold, and the auxiliary communication antenna exhibits negative magnetoresistance within the range of the actual operating frequency.

8. The communication module according to claim 6, wherein the auxiliary communication antenna includes a plurality of sub-antennas, and if the communication module receives an interference signal in a preset direction, the control module can adjust the capacitance value of the adjustable capacitor element of one or more sub-antennas in the auxiliary communication antenna that are close to the preset direction, so that the resonant frequency of the one or more sub-antennas deviates from the operating frequency of the communication antenna, or so that the one or more sub-antennas exhibit positive magnetoresistance within the operating frequency range of the communication antenna.

9. The communication module according to any one of claims 1 to 5, wherein the outer contour of the auxiliary communication antenna matches the outer contour of the communication antenna; Alternatively, the coverage of the auxiliary communication antenna relative to the communication antenna is greater than or equal to a preset threshold; Alternatively, the auxiliary communication antenna comprises a metal with a conductivity greater than or equal to 100 Siemens per meter; Alternatively, the metal coil of the auxiliary communication antenna may comprise a planar helical metal wire.

10. The communication module according to any one of claims 1 to 5, wherein the auxiliary communication antenna is located inside the communication module; or, the auxiliary communication antenna is fixed to the outer surface of the communication module.

11. An auxiliary communication antenna, comprising a metal coil with a plurality of turns; The auxiliary communication antenna exhibits negative magnetoresistance within a preset frequency range; the preset frequency range is the operating frequency of the first contactless communication device using the auxiliary communication antenna. The auxiliary communication antenna is used to be fixed in the first contactless communication device on the side close to the second contactless communication device; the second contactless communication device is a device for contactless communication with the first contactless communication device. At least a portion of the projection of the auxiliary communication antenna is located in the area where the communication antenna of the first contactless communication device is located; the auxiliary communication antenna covers the entire communication antenna or a portion of the communication antenna.

12. A contactless communication device, the device comprising any one of claims 1 to 10, or comprising the auxiliary communication antenna of claim 11.

Images