Radio frequency identification structure and electronic equipment applying same

Abstract

The utility model provides a radio frequency identification structure and an electronic device using the same. The radio frequency identification structure comprises a combining system, a radio frequency identification circuit and at least two linearly polarized antennas. One end of the combining system is electrically connected with each linearly polarized antenna, and the other end of the combining system is electrically connected with the radio frequency identification circuit, so as to mix tag reflection signals received by the linearly polarized antennas, obtain radio frequency signals to be identified, transmit the radio frequency signals to the radio frequency identification circuit, decode the radio frequency signals to be identified through the radio frequency identification circuit, and send the decoded radio frequency signals to the radio frequency identification circuit. And identifying the target object. By installing the radio frequency identification structure in the electronic equipment, the radio frequency identification structure can be used in combination with a plurality of groups of linearly polarized antennas and a combining system, so that the radio frequency identification structure keeps a good signal transceiving state at various angles, and the use distance and the signal transceiving quality of radio frequency identification are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to polarized antenna application field especially relates to a radio frequency identification structure and application radio frequency identification structure's electronic equipment. BACKGROUND

[0002] Under the big wave of Internet of Things and digital transformation, efficient collection and processing of data become the key link for many industries to realize intelligent operation. PDA (Personal Digital Assistant) products integrated with RFID (Radio Frequency Identification) function have been widely used in many fields such as logistics, warehousing, retail, medical treatment and so on, due to their convenient data collection, processing and communication capabilities. From real-time tracking of goods in the logistics industry to rapid reading of patient information in the medical field, such PDA products greatly improve work efficiency and management accuracy, and become an important tool to promote the digital development of the industry.

[0003] Under the trend of continuous pursuit of thinness of PDA products, some PDA products integrated with RFID function adopt single linear antenna design such as LDS / FPC / steel sheet support to realize thinner ID thickness.

[0004] However, since the angle of the Tag antenna on the measured object is random, when the PDA communicates with the Tag, the single linear antenna cannot maintain good signal transmission state at various angles, resulting in shortening of the effective use distance. INVENTION CONTENTS

[0005] The utility model embodiment discloses a radio frequency identification structure and application radio frequency identification structure's electronic equipment, solved the current PDA product because the angle of the Tag antenna on the measured object is random, when the PDA communicates with the Tag, the single linear antenna cannot maintain good signal transmission state at various angles, resulting in shortening of the effective use distance technical problem.

[0006] The utility model embodiment provides a radio frequency identification structure, including combining system, radio frequency identification circuit and at least two kinds of linear polarization antennas;

[0007] One end of the combining system is electrically connected with each linear polarization antenna respectively, and the other end is electrically connected with the radio frequency identification circuit, so as to mix the label reflection signal received by the linear polarization antenna, obtain the to-be-identified radio frequency signal and transmit to the radio frequency identification circuit;

[0008] The radio frequency identification circuit is used for identifying target objects according to the to-be-identified radio frequency signal.

[0009] Optionally, the linear polarized antenna is a GNSS linear polarized antenna configured for shared WWAN.

[0010] Optionally, the GNSS linear polarized antenna comprises a horizontal linear polarized antenna and a vertical linear polarized antenna.

[0011] Optionally, the resonant frequency band of the GNSS linear polarized antenna is adjusted to 902MHz-928MHz.

[0012] Optionally, the main resonant arm of the horizontal linear polarized antenna is parallel to the RFID circuit;

[0013] Optionally, the main resonant arm of the vertical linear polarized antenna is perpendicular to the RFID circuit.

[0014] Optionally, the mixing system comprises a hybrid circuit and a plurality of phase shift circuits electrically connected to the linear polarized antennas;

[0015] The hybrid circuit is electrically connected to the RFID circuit.

[0016] The phase shift circuits are electrically connected to the linear polarized antennas, for phase shifting the tag reflection signals received by the linear polarized antennas and inputting the phase shifted tag reflection signals to the hybrid circuit.

[0017] The hybrid circuit is used for mixing the phase shifted tag reflection signals to obtain the to-be-identified radio frequency signals and transmitting the to-be-identified radio frequency signals to the RFID circuit.

[0018] Optionally, the hybrid circuit comprises a radio frequency switch, a T-junction power divider or a Wilkinson power divider.

[0019] Optionally, the phase shift circuits comprise time delay lines or delay capacitors.

[0020] The utility model further provides an electronic equipment of application radio frequency identification structure, including equipment body and the radio frequency identification structure of any one described above;

[0021] The radio frequency identification structure is installed in the equipment body.

[0022] Optionally, the electronic equipment further comprises a radio frequency tag.

[0023] The radio frequency tag is used for returning tag reflection signals in response to the radio frequency signals output by the radio frequency identification structure.

[0024] From the above technical solutions, the embodiments of the utility model have the following advantages:

[0025] The utility model provides a kind of radio frequency identification structure, including combiner system, radio frequency identification circuit and at least two kinds of linear polarization antenna;The one end of combiner system is electrically connected with each linear polarization antenna respectively, and the other end is electrically connected with radio frequency identification circuit, to mix the label reflection signal received by linear polarization antenna, obtain the radio frequency signal to be identified and transmission to radio frequency identification circuit, decode the radio frequency signal to be identified by radio frequency identification circuit, and identify target object.Effective use distance and signal transceiver quality of radio frequency identification are effectively improved by using multiple linear polarization antennas combined with combiner system, so that radio frequency identification structure maintains good signal transceiver state under various angles.At the same time, the utility model further provides an electronic device using radio frequency identification structure, including device ontology and the radio frequency identification structure as any embodiment of the utility model;The radio frequency identification structure is installed in the device ontology.By multiplexing different configurations of antenna materials in electronic devices such as PDA products, the development cost is effectively reduced, and the effective use distance is enhanced by combining combiner system and different types of linear polarization antennas, and the utilization rate of multipath reflection signal is also enhanced.In addition, by installing the radio frequency identification structure in the embodiment, the thickness of the PDA product integrated with RFID function can remain unchanged, and the user experience can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0027] Figure 1 It is a structure schematic view of the radio frequency identification structure provided in the embodiment of the utility model.

[0028] Figure 2 It is a structure side view of the radio frequency identification structure in the embodiment of the utility model.

[0029] Figure 3 It is a structure top view of the radio frequency identification structure in the embodiment of the utility model.

[0030] Figure 4 It is a structure schematic view of the electronic device using radio frequency identification structure provided in the embodiment of the utility model.

[0031] Figure 5 It is a label reflection signal strength schematic view of radio frequency tag.

[0032] Figure 6 It is a top view of the label reflection signal strength of radio frequency tag provided in the embodiment of the utility model.

[0033] Figure 7 The utility model embodiment provides a label reflection signal strength side view of a radio frequency tag. DETAILED DESCRIPTION

[0034] The utility model embodiment discloses a radio frequency identification structure and electronic equipment applying the radio frequency identification structure, and is used to solve the technical problem that the effective use distance is shortened because the single linear antenna cannot keep good signal transceiving state under various angles when PDA and Tag communicate due to the randomness of the Tag antenna angle on the to-be-measured article of the existing PDA product.

[0035] Please refer to Figure 1 , Figure 1 The utility model embodiment provides a structure diagram of a radio frequency identification structure.

[0036] The utility model embodiment provides a radio frequency identification structure, which comprises a combining system, a radio frequency identification circuit and at least two linear polarization antennas.

[0037] One end of the combining system is electrically connected with each linear polarization antenna, and the other end is electrically connected with the radio frequency identification circuit, so as to mix the label reflection signals received by the linear polarization antennas, obtain the to-be-identified radio frequency signals and transmit them to the radio frequency identification circuit.

[0038] The radio frequency identification circuit is used to identify target objects according to the to-be-identified radio frequency signals.

[0039] The linear polarization antenna refers to an antenna whose radiation electric field vector is fixed and unchangeable in space. In the electromagnetic wave radiated by the antenna, the electric field vector reciprocates along a line. In the embodiment, the linear polarization antenna comprises a horizontal polarization antenna and a vertical polarization antenna. The electromagnetic wave electric field vector emitted by the horizontal polarization antenna is parallel to the ground, and the electromagnetic wave electric field vector emitted by the vertical polarization antenna is perpendicular to the ground.

[0040] In the actual use process of radio frequency identification, the antenna angle of the radio frequency tag on the to-be-measured article is random, which causes the effective identification distance to be only 1 / 3 to 1 / 2 of the maximum use distance claimed by the product, and affects the user experience. Therefore, the utility model embodiment provides a radio frequency identification structure, which is combined by a combining system, a radio frequency identification circuit and at least two linear polarization antennas, so as to improve the effective use distance of radio frequency identification while keeping the integrated RFID function of the PDA product and the unchanged light and thin appearance.

[0041] Specifically, in the use of the radio frequency identification structure, the radio frequency identification circuit generates a radio frequency signal along the combining system through each linearly polarized antenna, and after the radio frequency tag receives the radio frequency signal, the tag returns a reflected signal to the radio frequency identification circuit. Due to the difference in signal gain, the signal strength received by each linearly polarized antenna is also different. In order to ensure the accuracy of signal identification and the effective range of identification, the tag reflected signal is transmitted to the combining system for further signal superposition to generate a to-be-identified radio frequency signal returned to the radio frequency identification circuit, and the radio frequency identification circuit identifies the target object according to the to-be-identified radio frequency signal. For example, the to-be-identified identification signal corresponding to the article label code is calculated, which is compared with the article code stored in the database to quickly identify the target object. Or associate the received location data with the timestamp and store it in the "location information table". By analyzing the location data at different time points, the moving track of the article can be drawn. The location information of the article can be visualized on the map using geographic information system (GIS) software or related map API, which facilitates users to intuitively understand the location change of the article.

[0042] In addition, multi-dimensional verification can also be combined with production date, production batch, etc. to improve the accuracy of identification.

[0043] Optionally, the linearly polarized antenna is a GNSS linearly polarized antenna configured for a shared WWAN.

[0044] In a specific implementation, PDA products are generally divided into WWAN configuration and WLAN configuration, and on the basis of sharing two GNSS linearly polarized antennas in the WWAN configuration in the embodiment, one of the GNSS is designed as a horizontal linearly polarized antenna, and the other GNSS antenna is designed as a vertical linearly polarized antenna.

[0045] In hardware connection, at least two groups of GNSS linearly polarized antennas can be connected to the corresponding interfaces of the WWAN module, and through radio frequency switches or multiplexers and the like, time-sharing multiplexing of the two antennas and the WWAN module is realized, so that in different working modes, the corresponding antennas can be correctly selected and used.

[0046] Optionally, the GNSS linearly polarized antenna includes a horizontal linearly polarized antenna and a vertical linearly polarized antenna.

[0047] As shown in Figure 2 and Figure 3 , as shown in Figure 2 is a structure side view of a radio frequency identification structure in the embodiment of the utility model, Figure 3The structure top view of the radio frequency identification structure is shown in the embodiment of the utility model. Among them, the linear polarization antenna outputting horizontal electric field signal is horizontal linear polarization antenna, and the linear polarization antenna outputting vertical electric field signal is vertical linear polarization antenna. Linear polarization means that electric field vector oscillates on parallel straight line. The signal emitted by GNSS satellite is polarized, and the matching degree of polarization mode of antenna and polarization mode of satellite signal will affect the accuracy and reliability of positioning data. When linear polarization antenna is adopted, the direction of electric field vector is fixed, either vertical polarization (electric field vector is perpendicular to ground) or horizontal polarization (electric field vector is parallel to ground). Vertical polarization is usually used to receive signal from satellite at high position in the sky, and is suitable for application scene with clear and unobstructed sky view; horizontal polarization is used in scene where signal may be reflected on surface before reaching antenna, and is helpful to reduce interference.

[0048] In addition, in the process of selecting antenna type, in order to adapt to the use of small-sized products such as PDA, a microstrip patch antenna or the like can be selected. The horizontal linear polarization antenna makes current flow mainly in horizontal direction by adjusting the shape, size and feeding position of patch, so as to generate horizontal polarization wave. For example, the patch is designed into long strip shape, and the feeding point is located at one side of the patch, so that the electric field forms stable distribution in horizontal direction. The vertical linear polarization antenna is designed reversely to the horizontal linear polarization antenna, and the electric field vector of antenna is perpendicular to ground. Similarly, taking the microstrip patch antenna as an example, the patch can be designed into square or close to square, and the feeding point is located at or close to the center of the patch, so as to make current dominate in vertical direction, and then radiate vertical linear polarization wave.

[0049] Optionally, the resonance frequency band of the GNSS linear polarization antenna is adjusted to 902MHz-928MHz.

[0050] In the embodiment, after the PDA product is installed with the structure, the original antenna tuner of the PDA product can be configured through WWAN, the original GNSSL1 resonance point is adjusted to the resonance point of RFID, for example, 1574.4-1605.9MHz is changed to 902-928MHz; the original GNSSL5 resonance point is adjusted to the resonance point of RFID, for example, 1166.22-1186.68MHz is changed to 902-928MHz.

[0051] Optionally, the main resonance arm of the horizontal linear polarization antenna is parallel to the radio frequency identification circuit.

[0052] The main resonance arm of the vertical linear polarization antenna is perpendicular to the radio frequency identification circuit.

[0053] As Figure 4As shown, in the embodiment, the maximum gain direction of the horizontal polarization antenna is the top of the product, the electromagnetic wave in the maximum gain direction is horizontally polarized, and the main resonant arm of the antenna is horizontal to the PCB on which the RFID circuit is mounted. Similarly, the maximum gain direction is the top of the product, the electromagnetic wave in the maximum gain direction is vertically polarized, and the main resonant arm of the antenna is vertical to the PCB.

[0054] Optionally, the combining system comprises a hybrid circuit and a plurality of phase shift circuits electrically connected to the horizontal polarization antennas.

[0055] The hybrid circuit is electrically connected to the RFID circuit.

[0056] The phase shift circuits are electrically connected to the horizontal polarization antennas, and are configured to input the tag reflection signals received by the horizontal polarization antennas to the hybrid circuit after phase shifting.

[0057] The hybrid circuit is configured to mix the tag reflection signals after phase shifting to obtain the to-be-identified RFID signal and transmit the to-be-identified RFID signal to the RFID circuit.

[0058] Optionally, the hybrid circuit comprises a radio frequency switch, a T-junction power divider or a Wilkinson power divider.

[0059] Optionally, the phase shift circuit comprises a time delay line or a delay capacitor.

[0060] As shown, Figure 5 As shown, Figure 5 FIG. 1 is a structural schematic diagram of a combining system in an embodiment of the present application.

[0061] The signals received by the plurality of antennas can interfere with each other, affecting the identification performance of the system. The conventional processing method cannot effectively solve the signal interference problem, and cannot fully utilize the signals received by the plurality of antennas for enhancement. Therefore, in the embodiment, the phase shift circuit is used to reduce the mutual influence of the signals of the two antennas, and the hybrid circuit is used to enhance the two-way signals. The phase shift circuit can be designed as a time delay line or a delay capacitor. The hybrid circuit is used to integrate the tag reflection signals received by the two antennas. The hybrid circuit can be designed as a radio frequency switch, a T-junction power divider or a Wilkinson power divider.

[0062] In this embodiment, the tag-reflected signals are received by horizontally polarized antennas and vertically polarized antennas, respectively. These signals are then input to corresponding phase-shifting circuits, which shift the phase of the reflected signals, causing at least two sets of signals to be out of phase and reducing mutual interference. The phase-shifted signals are then input to a mixing circuit, where they are mixed to obtain the radio frequency (RF) signal to be identified. This RF signal is then decoded and identified by an RF identification circuit, thus completing the RF tag identification process.

[0063] It should be noted that, in addition to time-delay lines, delay capacitors can also be used in the intended circuit design. The capacitance value of the delay capacitor can be adjusted as needed to achieve phase shifting of the signal. For hybrid circuits, RF switches can be used to directly switch the signals from different antennas, or T-junction power dividers or Wilkinson power dividers can be used for signal mixing. Different hybrid circuit designs can be selected based on the actual application scenario and requirements.

[0064] This utility model provides a radio frequency identification (RFID) structure, including a combining system, an RFID circuit, and at least two types of linearly polarized antennas. One end of the combining system is electrically connected to each linearly polarized antenna, and the other end is electrically connected to the RFID circuit. This allows the system to mix the tag-reflected signals received by the linearly polarized antennas to obtain the RFID signal to be identified, which is then transmitted to the RFID circuit. The RFID circuit decodes the RFID signal to identify the target object. By using multiple sets of linearly polarized antennas in conjunction with the combining system, the RFID structure maintains good signal transmission and reception at various angles, effectively improving the operating distance and signal transmission and reception quality of the RFID system.

[0065] This utility model embodiment also provides an electronic device using a radio frequency identification (RFID) structure, including a device body and an RFID structure as described in any embodiment of this utility model;

[0066] The radio frequency identification structure is installed inside the device body.

[0067] Optionally, it may also include an RFID tag;

[0068] The RFID tag is used to respond to the RFID signal output by the RFID structure and return a tag reflection signal.

[0069] like Figure 4 As shown, the electronic device can be a PDA product, including the device body and the radio frequency identification (RFID) structure. The installation of the RFID structure is completed by mounting the horizontally polarized antenna and the vertically polarized antenna on the top of the electronic device and integrating the combining system and the RFID circuit on the PCB.

[0070] In practical applications, the amount of energy received and reflected by a tag and a reader using a linear antenna is affected by the linear polarization angles of the tag and reader. For example... Figure 6 and Figure 7 As shown, it illustrates a schematic diagram of the reflected signal strength of an RFID tag. Figure 6 At a top-down view angle, the electric field strength is greatest for horizontally polarized signals and least for vertically polarized signals. Figure 7 From a side-view angle, the electric field strength of the horizontally polarized signal is the lowest, while that of the vertically polarized signal is the highest. During use, the horizontally placed tag has the highest communication efficiency with the reader's horizontally polarized antenna, and the lowest (ideally 0) with the reader's vertically polarized antenna. Conversely, the vertically placed tag has the highest communication efficiency with the reader's vertically polarized antenna, and the lowest (ideally 0) with the reader's horizontally polarized antenna. During use, tags placed at ±45 degrees can communicate with both the reader's horizontally and vertically polarized antennas, with efficiency falling somewhere in between.

[0071] In this embodiment of the invention, an electronic device employing a radio frequency identification (RFID) structure is provided, comprising a device body and an RFID structure as described in any embodiment of the invention; the RFID structure is installed within the device body. By reusing antenna materials with different configurations in electronic devices such as PDA products, development costs are effectively reduced. Simultaneously, by combining a combining system and different types of linearly polarized antennas, the effective operating distance is enhanced, and the utilization rate of multipath reflected signals is improved. Furthermore, by installing the RFID structure in this embodiment, the thickness of the PDA product integrating RFID functionality remains unchanged, effectively improving the user experience.

[0072] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, 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, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0073] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can be referred to each other.

[0074] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A radio frequency identification structure, characterized in that, Includes a combining system, radio frequency identification circuitry, and at least two types of linearly polarized antennas; One end of the combining system is electrically connected to each of the linearly polarized antennas, and the other end is electrically connected to the radio frequency identification circuit, so as to mix the tag reflection signals received by the linearly polarized antennas to obtain the radio frequency signal to be identified and transmit it to the radio frequency identification circuit. The radio frequency identification circuit is used to identify the target object according to the radio frequency signal to be identified.

2. The radio frequency identification structure according to claim 1, characterized in that, The linearly polarized antenna is a GNSS linearly polarized antenna configured for the shared WWAN.

3. The radio frequency identification structure according to claim 2, characterized in that, The GNSS linearly polarized antenna includes a horizontally polarized antenna and a vertically polarized antenna.

4. The radio frequency identification structure according to claim 2, characterized in that, The resonant frequency band of the GNSS linearly polarized antenna was adjusted to 902MHz~928MHz.

5. The radio frequency identification structure according to claim 3, characterized in that, The main resonant arm of the horizontally polarized antenna is parallel to the radio frequency identification circuit. The main resonant arm of the vertically polarized antenna is perpendicular to the radio frequency identification circuit.

6. The radio frequency identification structure according to claim 1, characterized in that, The combining system includes electrically connected hybrid circuits and phase-shifting circuits equal in number to the linearly polarized antennas; The hybrid circuit is electrically connected to the radio frequency identification circuit; The phase-shifting circuit is electrically connected to a single linearly polarized antenna and is used to phase-shift the tag-reflected signal received by each linearly polarized antenna before inputting it to the hybrid circuit; The mixing circuit is used to mix the phase-shifted tag reflection signal to obtain the radio frequency signal to be identified and transmit it to the radio frequency identification circuit.

7. The radio frequency identification structure according to claim 6, characterized in that, The hybrid circuit includes an RF switch, a T-junction power divider, or a Wilkinson power divider.

8. The radio frequency identification structure according to claim 6, characterized in that, The phase-shifting circuit includes a delay line or a delay capacitor.

9. An electronic device employing a radio frequency identification (RFID) structure, characterized in that, Includes the device body and the radio frequency identification structure as described in any one of claims 1-8; The radio frequency identification structure is installed inside the device body.

10. The electronic device according to claim 9, characterized in that, It also includes radio frequency tags; The RFID tag is used to respond to the RFID signal output by the RFID structure and return a tag reflection signal.

Images