Millimeter wave tag supporting communication and induction integration

Abstract

The invention relates to the technical field of wireless communication and radio frequency identification, and discloses a millimeter wave tag supporting communication and induction integration, comprising an antenna module which adopts a Van Atta antenna array structure, and enables the direction of a received signal to be consistent with the direction of a reflected signal through symmetrically arranged antenna units and phase matching characteristics; the radio frequency switch module constructs a radio frequency switch network and a bias network through a radio frequency switch device and a bias network device, switch switching and bias control of signals are achieved, and label information is sent by changing the switch state; and the bias control module is used for providing stable direct current bias voltage for the radio frequency switch module. The method can be applied to scenes of Internet of Things, intelligent manufacturing, logistics management, environment monitoring and the like, and can improve the communication efficiency, the label recognition rate and the stability of data transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communication and radio frequency identification, and in particular to a millimeter wave tag supporting interaesthesia. Background Art

[0002] With the rapid development of Internet of Things technology, radio frequency identification (RFID), as an efficient wireless identification and communication technology, has been widely used in logistics management, intelligent manufacturing, environmental monitoring and other fields. However, traditional RFID tags mainly work in low frequency (LF), high frequency (HF) or ultra-high frequency (UHF) bands. Although the technology of these bands is mature, there are certain limitations in terms of communication distance, data transmission rate and utilization of spectrum resources, which makes it difficult to meet the needs of modern applications with high speed and large data volume. Especially in the context of increasingly tight spectrum resources, the interference problem in low frequency bands is becoming more and more serious, further limiting the performance improvement of the system.

[0003] The millimeter wave band (30GHz to 300GHz) has gradually become an important development direction in the field of wireless communications due to its advantages such as wide bandwidth, high data transmission rate, narrow beam and strong anti-interference ability. On this basis, the backscattering technology working in the millimeter wave band of 60GHz to 64GHz has attracted widespread attention. This band has high available spectrum resources and low interference characteristics, which provides the possibility for efficient tag design. However, the design of millimeter wave backscattering tags has significant technical challenges compared with traditional low-frequency band tags. First, due to the shorter signal wavelength of the millimeter wave band, higher requirements are placed on the design and processing accuracy of the tag antenna; secondly, the power consumption of the tag in the high-frequency working environment needs to be strictly controlled to ensure that it can operate stably under low power consumption conditions; in addition, the millimeter wave signal is more sensitive to environmental changes and is easily affected by obstacles and climatic conditions, so the tag design must have excellent environmental adaptability and reliability.

[0004] Currently, there are relatively limited tag design solutions that can stably support backscatter communications in the millimeter wave band, and the development of related technologies is still in its infancy. How to achieve low-power, high-efficiency, stable and reliable backscatter communications in the millimeter wave band is a key issue in promoting technological progress in this field. Therefore, developing a backscatter tag design technology that supports the 60GHz to 64GHz millimeter wave band can not only effectively improve the communication performance and system efficiency of the tag, but also provide important technical support for the application expansion of the Internet of Things and wireless communications. Summary of the invention

[0005] The present invention provides a millimeter wave tag supporting interaesthesia, aiming at realizing backscatter communication of millimeter waves.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A millimeter wave tag supporting synaesthesia, comprising:

[0008] The antenna module adopts the Van Atta antenna array structure. Through the symmetrical arrangement of antenna units and phase matching characteristics, the direction of the received signal is consistent with the direction of the reflected signal.

[0009] The RF switch module realizes the switching and bias control of the millimeter wave RF signal by constructing the RF switch network and bias network;

[0010] A bias control module, used to provide a stable DC bias voltage for the RF switch module;

[0011] The communication control module changes the strength of the millimeter wave tag reflection signal by controlling the RF switch state, thereby realizing the tag's information sending function.

[0012] Furthermore, the substrate of the antenna module adopts a double-sided copper clad structure, the conductor layer is processed by a chemical copper plating process, and a thermal conductive copper layer is introduced as an auxiliary heat dissipation path.

[0013] Furthermore, a radio frequency switch and a bias network are used to control the tag's reflection characteristics to millimeter wave radio frequency signals, thereby realizing the tag information sending function.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are:

[0015] High-frequency and efficient communication: The tag supports the 60GHz to 64GHz millimeter wave frequency band, and uses the wide bandwidth characteristics of millimeter waves to achieve high data transmission rate and high spectrum utilization, meeting the needs of high-speed and large-capacity data communication in the modern Internet of Things.

[0016] Directivity enhancement design: The Van Atta antenna array structure is adopted, and the automatic beam alignment feature significantly improves the directionality and intensity of signal backscattering, effectively solves the problem of high attenuation of millimeter wave signals, and improves the communication distance and data demodulation performance of the tag.

[0017] Strong environmental adaptability: The tag has good anti-interference ability and environmental adaptability, can operate stably in complex industrial and outdoor environments, and meet the application requirements of multiple scenarios.

[0018] Reduce power consumption and cost: By simplifying the tag design, the system's energy consumption and manufacturing cost are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a millimeter wave switch control device;

[0020] Figure 2 is a schematic diagram of bias network devices;

[0021] Figure 3 Schematic diagram of a switch control module composed of a switch device and a bias device. DETAILED DESCRIPTION

[0022] A preferred embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0023] 1. System architecture overview:

[0024] The millimeter wave backscatter tag in the present invention is designed to support efficient communication in the 60GHz to 64GHz frequency band, and the overall architecture is divided into an antenna module, an RF switch module, and a bias control module. In order to overcome the high attenuation of the millimeter wave frequency band signal, the tag adopts a Van Atta antenna array, and through the adaptive beam alignment capability, it realizes efficient reflection and modulation of the incident wave energy, thereby improving the efficiency and reliability of data transmission. At the same time, the core RF switch network realizes efficient switching and bias control of the signal by selecting high-performance devices such as MA4AGSW1 and MA4BN1840-1, providing the tag with stable modulation performance. The entire architecture design fully considers the special needs of the millimeter wave frequency band, and has the characteristics of high gain, low power consumption and high robustness.

[0025] 2. Target application scenarios and issues:

[0026] The present invention is applicable to the following target application scenarios:

[0027] (1) Internet of Things (IoT): used for inter-device communication in smart homes, smart cities, and other environments, such as environmental monitoring and energy management.

[0028] (2) Wireless sensor networks: Deploy a large number of low-power sensors in agriculture, industry or medical fields for data collection and monitoring.

[0029] (3) Asset tracking and management: In the logistics and warehousing industries, it is used to track and manage goods, equipment, etc.

[0030] (4) Environmental monitoring: used to monitor environmental indicators such as climate change and air quality.

[0031] 3. Module design details:

[0032] 3.1, Antenna module design:

[0033] In order to overcome the high attenuation problem inherent in millimeter wave frequency band signal transmission, the present invention selects the Van Atta antenna array structure as the core component. The Van Atta antenna uses symmetrically arranged antenna units and precise phase matching characteristics to make the direction of the received signal consistent with the direction of the reflected signal, thereby realizing the automatic beam alignment function and greatly improving the directionality and intensity of signal reflection.

[0034] In order to meet the performance requirements of millimeter wave backscatter tags in the 60GHz to 64GHz frequency band, the present invention selects Rogers 5880 as the substrate of the antenna module. This material has excellent high-frequency characteristics and mechanical stability, and the specific parameters are as follows:

[0035] (1) Dimensions:

[0036] The PCB size is 23.9×25.4mm, with a compact design, suitable for miniaturized millimeter wave tag application scenarios.

[0037] (2) Material thickness and characteristics:

[0038] The substrate thickness is 0.254mm, and a double-sided copper-clad structure is used, with each layer of copper foil being 17μm thick. The dielectric constant (ε r =2.2) and the loss factor (tanδ=0.0009) are extremely low, which can effectively reduce the propagation loss of the signal in the substrate, thereby improving the working efficiency of the antenna.

[0039] (3) Processing technology:

[0040] The conductor layer of the board is processed by chemical copper plating process to ensure high conductivity and uniformity of the copper foil surface. The width and spacing of the microstrip transmission line of the antenna unit are optimized through simulation to achieve the best impedance matching (50Ω) and signal transmission performance.

[0041] (4) Frequency band optimization:

[0042] In the millimeter wave frequency band, the thickness of the substrate has a significant impact on the performance of the antenna. The 0.254 mm thickness of the present invention takes into account both high-frequency loss control and mechanical stability, while optimizing the antenna radiation efficiency and directivity.

[0043] (5) Thermal management and reliability:

[0044] To further enhance the system's thermal management capabilities, a thermally conductive copper layer is introduced into the substrate design as an auxiliary heat dissipation path, effectively reducing the thermal effect during high-frequency signal operation. In addition, Rogers 5880 material has good environmental tolerance and can maintain stable performance under high humidity and high temperature conditions, making it suitable for industrial and outdoor scenarios.

[0045] Through the optimization selection of the above panels and related parameters, the antenna module exhibits excellent characteristics of high gain, low loss and high reliability within the working frequency band, providing a solid foundation for the efficient communication of millimeter-wave backscatter tags.

[0046] 3.2, RF switch module:

[0047] The RF switch module is the core of the tag modulation function and determines the modulation efficiency and switching speed of the millimeter wave signal. In the present invention, two high-performance devices, MA4AGSW1 and MA4BN1840-1, are selected to construct the RF switch network and bias network respectively, forming an efficient RF signal switching path.

[0048] like Figure 1 As shown in the figure, MA4AGSW1 is a millimeter wave RF switch with low insertion loss, high isolation and high-speed switching characteristics. Its operating frequency range covers 60GHz, which fully meets the design requirements. In the actual circuit, the switch is connected in a multi-level structure, combined with microstrip transmission lines and impedance matching networks to ensure minimum loss and high stability on the signal path.

[0049] 3.3, Bias control module:

[0050] The bias control module is responsible for providing accurate DC bias voltage for the RF switch, ensuring stable performance during high-speed switching while achieving low power consumption. This module significantly improves the modulation efficiency and reliability of the RF switch through precise circuit design and device selection.

[0051] like Figure 2 As shown in the figure, MA4BN1840-1, as the core device of the bias network, has wide-band characteristics and can stably support operating frequencies above 60GHz. By optimizing the bias path design, the device can provide linear and stable bias current and voltage to avoid the degradation of switching performance caused by bias fluctuations.

[0052] The structure after putting the two chips together is as follows Figure 3 shown.

[0053] Example

[0054] The millimeter-wave backscatter tag designed by the present invention can be applied to the low-altitude economic field, and is particularly suitable for the precise positioning and identification of drones. With the widespread application of drone technology in the fields of logistics and transportation, agricultural monitoring, public safety, and urban management, the number and frequency of drone activities continue to increase. How to efficiently and accurately locate and identify drones has become an important technical requirement for low-altitude airspace management. The positioning device can accurately determine the position of the drone through the directionality and time difference technology of the reflected signal, and effectively solve the problems of multipath interference and high attenuation in the low-altitude environment. The tag can embed specific ID information in the reflected signal, and the ID information is returned to the positioning device after being superimposed on the signal through the modulation process of the radio frequency switch. After the device demodulates the signal, in addition to obtaining the location of the drone, it can also read the drone's unique identity (ID) at the same time, realizing efficient multi-target differentiation and management.

[0055] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0056] In addition, it should be understood that although the present specification is described in terms of implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A millimeter wave tag supporting synaesthesia, characterized in that: include: The antenna module adopts the Van Atta antenna array structure. Through the symmetrical arrangement of antenna units and phase matching characteristics, the direction of the received signal is consistent with the direction of the reflected signal. The RF switch module realizes the switching and bias control of the millimeter wave RF signal by constructing the RF switch network and bias network; A bias control module, used to provide a stable DC bias voltage for the RF switch module; The communication control module changes the strength of the millimeter wave tag reflection signal by controlling the RF switch state, thereby realizing the tag's information sending function.

2. The millimeter wave tag supporting synaesthesia according to claim 1, characterized in that: The antenna unit adopts the VanAtta array structure, and the direction of the received signal is consistent with the direction of the reflected signal.

3. The millimeter wave tag supporting synaesthesia according to claim 1, characterized in that: The RF switch and bias network are used to control the tag's reflection characteristics to the millimeter-wave RF signal to realize the tag information sending function.

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