Wireless communication device and wireless communication method using the same

Abstract

To provide a wireless communication device and a wireless communication method using the wireless communication device.SOLUTION: An antenna device included in a wireless communication device includes an antenna plate, a ground plate supporting the antenna plate, and an impedance matching circuit for impedance matching of the antenna device. The area of an upper surface of the antenna plate is formed in a ratio that is specified in advance according to a resonance frequency for communication, and the impedance matching of the antenna device is adjusted based on the interval between a feeding line and a ground line connected to the antenna plate.SELECTED DRAWING: Figure 3A

Description

Technical Field

[0001] This disclosure relates to a wireless communication device and a wireless communication method using the same.

Background Art

[0002] Since ships are made of metal, wireless communication may not be smoothly performed inside the ships. Therefore, inside the ships, a wired communication system provided with wired cables is mainly used. However, such a wired communication network has to make holes in the bulkheads of the ship, and the length of the cables may reach dozens of kilometers, so it costs a great deal for installation and maintenance. Also, even though a wired communication network is installed, there are still communication shadow areas, making it difficult for crew members and workers to communicate, and potentially threatening the safety of crew members and workers. In addition, inside the ships, the installation of power cables for power supply to various devices is required. Thus, there are many cables for a wired communication network and power supply inside the ships, and a great deal of cost is required for providing and maintaining those cables.

[0003] Not only the ships described above, but also the same or similar problems exist in refrigerated containers (including cold chain control), large vehicles, chemical complexes or large-scale plant facilities, huge metal structures such as oil pipelines, etc.

Prior Art Documents

Patent Documents

[0004] Korean Patent Registration No. 1313018 (September 24, 2013)

Summary of the Invention

Means for Solving the Problems

[0005] An antenna device according to an embodiment is The top surface is square-shapedAntenna plate and support for the antenna plate And, in order to communicate using the metal body as a medium, the metal surface of the metal body is in contact with Ground plate and A support portion for maintaining a constant distance between the antenna plate and the ground plate, and for supporting the antenna plate, wherein the support portion includes a dielectric made of a non-metallic material. The system includes an impedance matching circuit for impedance matching of the antenna device, wherein the impedance matching of the antenna device is performed by the spacing between the feeding line and the ground line connected to the antenna plate. and the impedance matching circuit Adjusted based on, The feeding line and the ground line are arranged parallel to the support portion, the feeding line is connected to the impedance matching circuit, and the impedance matching circuit is located within a shield portion made of metal material provided on the ground plate.

[0006] The antenna plate can be grounded to the ground plate.

[0007] The antenna device may further include a communication circuit that analyzes signals transmitted and received through the antenna plate to determine whether communication is possible.

[0008] The communication circuit can analyze the signal received through the antenna plate to identify the bit error rate and determine whether communication is possible based on the comparison result between the identified bit error rate and a threshold.

[0009] A wireless communication device according to one embodiment includes an antenna device as described in claim 1, a processor that processes signals transmitted and received via the antenna device, and a communication module that transmits the signals processed by the processor to a communication terminal device. [Effects of the Invention]

[0010] According to the present invention, a wireless communication device and a wireless communication method using the same can be provided. [Brief explanation of the drawing]

[0011] [Figure 1] This is a diagram illustrating an example of the installation of a wireless communication device inside a ship according to one embodiment. [Figure 2] This block diagram shows the configuration of a wireless communication device including an antenna device according to one embodiment. [Figure 3A]A structural diagram of an antenna device according to one embodiment is shown. [Figure 3B] A structural diagram of an antenna device according to one embodiment is shown. [Figure 3C] A structural diagram of an antenna device according to one embodiment is shown. [Figure 3D] A structural diagram of an antenna device according to one embodiment is shown. [Modes for carrying out the invention]

[0012] The specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only and can be modified in various ways. Therefore, embodiments are not limited to any particular form of disclosure, and the scope of this specification includes modifications, equivalents, or substitutions of the technical ideas described in the embodiments.

[0013] Terms such as "first" or "second" may be used to describe multiple components, but such terms should be interpreted solely for the purpose of distinguishing one component from others. For example, the first component can be named the second component, and similarly, the second component can also be named the first component.

[0014] When it is mentioned that one component is "connected" to another, it should be understood that it is directly linked to or connected to the other component, but that other components may be present in between.

[0015] A singular expression can include multiple expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprising" or "having" indicate the presence of the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should not be construed as precluding the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0016] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the relevant technical field. Generally used pre-defined terms should be construed to have a meaning consistent with the meaning they have in the context of the relevant art, and should not be construed in an idealized or overly formal sense unless clearly defined herein.

[0017] The term "module" used in this specification includes units implemented in hardware, software, or firmware, and can be used interchangeably with terms such as, for example, logic, logic blocks, parts, or circuits. A module may be an integrally configured part, or the smallest unit or a part of such a part that executes one or more functions. For example, according to one embodiment, a module is implemented in the form of an ASIC (application-specific integrated circuit).

[0018] The term "~ part" used in this specification means a software or hardware component such as an FPGA or ASIC, and the "~ part" plays a certain role. However, the "~ part" is not meant to be limited to software or hardware. The "~ part" may be configured to be on an addressable storage medium, or may be configured to cause one or more processors to execute. For example, "~part" can include components such as software components, object-oriented software components, class components, and task components; processes, functions, attributes, procedures, subroutines, segments of program code; drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided within a component and its "~part" can be combined into fewer components and "~parts," or further divided into additional components and "~parts." Furthermore, the components and “~parts” may be embodied to cause one or more CPUs within the device or secure multimedia card to regenerate. Furthermore, the "~ section" may include one or more processors.

[0019] The embodiments will be described in detail below with reference to the attached drawings. When explaining with reference to drawings, the same components will be assigned the same reference numerals regardless of the drawing numerals, and redundant explanations for them will be omitted.

[0020] Figure 1 is a diagram illustrating an example of the installation of a wireless communication device inside a ship according to one embodiment.

[0021] Referring to Figure 1, the wireless communication devices 110 and 120 according to one embodiment can communicate using a metal body as the medium. The wireless communication devices 110 and 120 provide a communication relay function via communication using a metal medium. A wireless communication device can receive signals and / or data from a communication terminal device (e.g., a radio) connected to it, and transmit the received signal data to another wireless communication device using a metallic medium. The wireless communication devices 110 and 120 can efficiently perform wireless communication using a metal medium in communication shadow environments where communication using radio waves is difficult due to metal bodies such as ships, containers, and trailers. The wireless communication devices 110 and 120 may include an antenna device that is attached to the metal hull of the ship 100, causes an electromagnetic field to form on the metal hull, and propagates voice data received from a data processing unit (e.g., a processor) via the electromagnetic field through the metal body. The antenna devices of the wireless communication devices 110 and 120 receive signals and / or data transmitted to the electromagnetic field via a metal body, and the wireless communication devices 110 and 120 can transmit the received signals and / or data to a communication terminal device via their own communication channel.

[0022] The principle by which signals and / or data are transmitted through a metal body is as follows: The metal medium may, for example, be the steel plates or frame structure of the ship's hull. We will explain this by classifying it into two cases: when the medium of the metallic body is magnetic and when it is diamagnetic.

[0023] When the medium of the metallic body is a magnetic material, the conductive layer of the first antenna causes an electromagnetic field to form in the dielectric layer. As a result, this electromagnetic field creates a dominant electromagnetic field in the metal medium, which is the radio wave medium. Of the generated electromagnetic fields, electric field E1 propagates through the aperture of the first antenna perpendicular to the metallic medium. The propagated electric field E1 causes a dominant electromagnetic field B to form within the metallic medium.

[0024] According to the theory of reversibility, the second antenna on the receiving side receives energy from the electromagnetic field formed within the metallic medium using a similar structure and principle. In this process, a change in the dominant electromagnetic field B is transmitted from the dielectric layer through the aperture of the second antenna to the dominant electromagnetic field E2.

[0025] In communications using a metallic medium (also called metallic communications), the magnetic field is dominant, so even if the shape and size of the metallic medium change, the change in impedance is small. Furthermore, because metal media have a higher magnetic permeability than air, the transmission efficiency of radio waves is superior to that of communication systems that propagate through air. Therefore, communication through a magnetic medium such as a metal is much longer than communication through a magnetic field in the air. In order for a magnetic field to form a dominant electromagnetic field, the resonant section and circuit section of the wireless relay device must be designed so that an electric field of a certain magnitude is formed inside the metal body.

[0026] The electromagnetic field formed in the metallic medium allows energy to be transferred to a resonator located at a certain distance from the metallic medium. Because the electromagnetic field formed in a metallic medium is dominated by the magnetic field, an electric field is radiated from the metallic medium. Therefore, when an antenna resonating at the operating frequency is within a certain distance from the metallic medium, energy reception is possible.

[0027] The dielectric of the dielectric layer of the first or second antenna has a reduced thickness and size in the resonant section, and can transmit sufficient energy by forming an electromagnetic field B in which the magnetic field is dominant within the metallic medium.

[0028] When the medium of the metallic body is paramagnetic or diamagnetic, the current supplied to the conductive layer forms a dominant electromagnetic field E1 in the metallic medium. Here, the electric field radiated from the opening surface cannot create a dominant electromagnetic field B within the metal medium. In this regard, because paramagnetic and diamagnetic materials have permeability similar to that of air, the magnetic field in a metallic medium of paramagnetic or diamagnetic materials does not propagate as strongly as in the case of ferromagnetic materials, but rather propagates at a similar magnitude. In other words, the distance over which signals propagate through air or within a metal body is similar.

[0029] While pure iron, a ferromagnetic material, has a magnetic permeability of 4000-5000, aluminum, a paramagnetic material, and silver (Ag), a diamagnetic material, have a magnetic permeability of approximately 1.0, indicating a difference in the strength of magnetic fields and radio waves within the metal. Therefore, in this case, the signal is propagated to the receiver by a current induced in the metallic medium from the conductive layer of the antenna that is in contact with the metallic medium. Here, an electric field radiated from the aperture surface is induced in the metal body, thereby transmitting a signal or power.

[0030] In the case of structures whose main structure is made of metal, such as the ship 100 shown in Figure 1 (for example, an LNG carrier), radio waves cannot pass through the metal, resulting in reflection and / or attenuation, which can hinder smooth wireless communication. Therefore, in the case of structures made of metal, wireless communication shadow areas may occur where wireless communication is difficult or impossible. For example, radio communication shadow areas can occur in areas such as the pipe ducts, engine room, bosun store, engine control room (ECR), and bow thruster room of an LNG vessel. What is most needed here is relay equipment that can be used between a region and a radio communication shadow area, such as a cargo control room (CCR), bridge, living quarter, or upper deck, including a compass deck, where radio waves can be easily radiated into the air and general radio communication can proceed smoothly. According to one embodiment, the wireless communication devices 110 and 120 serve as relays that relay communication between a wireless communication area and a wireless communication shadow area.

[0031] Assume there are locations within the ship 100 where the radio communication devices 110 and 120 cannot be installed. It is possible to install the wireless communication devices 110 and 120 in locations within the vessel 100 where they can be installed, and to install the antenna devices 150 and 160 proposed in this disclosure (for example, the antenna device 300 in Figure 3A) via cables 130 and 140 (for example, RF cables). Antenna device 150 is connected to wireless communication device 110 via cable 130, and antenna device 160 is connected to wireless communication device 120 via cable 140. In explosion-proof areas, antenna devices 150 and 160 can also be installed via RF barriers (or RF couplers) 135 and 145.

[0032] Figure 2 is a block diagram showing the configuration of a wireless communication device including an antenna device according to one embodiment.

[0033] Referring to Figure 2, the wireless communication device 200 corresponds to the wireless communication devices described in this disclosure (for example, the wireless communication devices 110 and 120 shown in Figure 1). The wireless communication device 200 includes a processor 210, memory 220, communication module 230, antenna device 240 (for example, antenna devices 150 and 160 shown in Figure 1, and antenna device 300 shown in Figure 3A), and display module 250, and each component of the wireless communication device 200 may communicate via a communication bus 260. In one embodiment, some of these components (for example, the display module 250) may be omitted from the wireless communication device 200, or other components may be added.

[0034] The processor 210 can control other components of the wireless communication device 200 (e.g., hardware or software components) and perform various data processing or calculations. According to one embodiment, as part of data processing or calculation, the processor 210 can store instructions or data received from other components in the memory 220, process the instructions or data stored in the memory 220, and store the resulting data in the memory 220.

[0035] The processor 210 may include a main processor (e.g., a central processing unit or application processor) or auxiliary processors that can operate independently or together with it (e.g., a graphics processing unit, a neural network processing unit (NPU), an image signal processing unit, a sensor hub processor, or a communication processor).

[0036] The memory 220 can store various data used by the components of the wireless communication device 200 (for example, the processor 210 or the communication module 230). The data may include, for example, a program (e.g., an application), input and / or output data of instructions related thereto, and signals and / or data received from a communication terminal device. Memory 220 stores instructions that can be executed by the processor 210. Memory 220 may include volatile memory or non-volatile memory.

[0037] The communication module 230 can support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between the wireless communication device 200 and other devices (e.g., other wireless communication devices, communication terminal devices), and the execution of communication through the established communication channel. The communication module 230 may include a communication circuit for performing communication functions. The communication module 230 operates independently of the processor 210 and may include a communication processor that supports direct (e.g., wired) communication or wireless communication. The communication module 230 may include a wireless communication module and / or a wired communication module for wireless communication.

[0038] The processor 210 can control the wireless communication device 200 to perform one or more operations of the wireless communication device described in this disclosure by executing instruction words stored in the memory 220.

[0039] In one embodiment, the processor 210 checks whether communication is possible through the wireless communication device 200. The processor 210 analyzes the signals and / or data received via the antenna device 240 to determine the communication sensitivity and predicts whether communication is possible based on the determined communication sensitivity. The predicted feasibility of communication and / or communication sensitivity (communication quality information) can be displayed via the display module 250. For example, the processor 210 may determine the received signal strength indicator (RSSI) for signals and / or data received via the antenna device 240, and determine the communication sensitivity based on the magnitude of the received signal strength. It may be determined that the stronger the received signal, the better the communication sensitivity. As a different example, the processor 210 may check the bit error rate of the received signal (e.g., a digital signal) and indicate via the display module 250 that communication is possible until the bit error rate falls below a certain threshold. For example, if the bit error rate exceeds 3%, it may be determined that communication is not possible, but there are no restrictions on the specific numerical value. The bit error rate indicates how many bits are corrupted or how many errors have occurred in the received signal.

[0040] Furthermore, the communication sensitivity of the communication terminal device to communication with the wireless communication device 200 can also be determined, and it is possible to predict whether communication is possible based on the predicted communication sensitivity. The predicted possibility of communication and / or communication sensitivity (communication quality information) may be displayed via the display unit (e.g., a display) of the communication terminal device. The communication terminal device can check the bit error rate of the signal (e.g., a digital signal) received from the wireless communication device 200 and display via a display unit that communication is possible until the bit error rate falls below a certain threshold.

[0041] The proposed wireless communication system can provide the function of relaying signals on the same communication channel. Communication terminal devices (for example, digital radio terminals) typically have the function of transmitting / receiving voice signals or data signals, but signal transmission does not occur smoothly in wireless communication shadow areas. To extend the communication range of such communication terminal devices, a device (e.g., wireless communication device 200) that relays signals on the same channel and transmits signals over long distances may be applied to the wireless communication system.

[0042] Figures 3A, 3B, 3C, and 3D show the structure of an antenna device according to one embodiment.

[0043] Figure 3A is a perspective view of an antenna device according to one embodiment, and Figure 3B is a plan view of an antenna device according to one embodiment. Figure 3C is a side view of an antenna device according to one embodiment, viewed from direction A as shown in Figure 3A, and Figure 3D is a side view of an antenna device according to one embodiment, viewed from direction B as shown in Figure 3A.

[0044] Referring to Figures 3A, 3B, 3C, and 3D, the antenna device 300 functions as an antenna device for the wireless communication devices described in this disclosure (for example, the wireless communication devices 110 and 120 shown in Figure 1, and the wireless communication device 200 shown in Figure 2). In one embodiment, the antenna device 300 may have a height within a predetermined range (for example, the height from the ground plate 330 to the antenna plate 310).

[0045] The ground plate 330 supports the antenna plate 310 and is in contact with the target metal surface. The ground plate 330 may include, for example, a ground brass plate that takes into account the target frequency for communication. The ground plate 330 may also function as the antenna body. The area of ​​the antenna plate 310 is formed in a ratio predetermined by the resonant frequency required for communication. By adjusting the area of ​​the antenna plate 310, it is possible to design an antenna suitable for any resonant frequency. The antenna plate 310 is grounded to the ground plate 330. The length 370 of the upper surface of the antenna plate 310 corresponds to the length of the antenna of the antenna device 300. The impedance matching of the antenna device 300 can be adjusted by adjusting the matching value via the gap or spacing 360 between the feeding line 355 and the ground line 350 and the impedance matching circuit. A circuit connected to the antenna device 300 (for example, including the processor 210 shown in Figure 2) can analyze the signal received through the antenna device 300 and predict whether communication is possible.

[0046] The antenna device 300 maintains a constant distance between the ground plate 330 and the antenna plate 310 and includes a support portion 320 for supporting the antenna plate 310. The support portion 320 may include, for example, an auxiliary dielectric made of a non-metallic material (e.g., polycarbonate (PC)), which can maintain a constant height of the metal of the antenna plate 310. In the antenna device 300, the degree of impedance matching of the antenna device can be adjusted using the width between the ground line 350 and the feeding line 355. Furthermore, by adjusting the length 370 of the antenna plate 310, the desired operating frequency for the antenna device can be selected.

[0047] The antenna device 300 may further include an impedance matching circuit (not shown) for impedance matching of the antenna device 300, and the impedance matching circuit may be protected by a shield 340. The shield portion 340 may include, for example, an aluminum material, and an impedance matching circuit may be arranged within the shield portion 340. The impedance matching circuit may be connected to the feeding line 355. The antenna plate 310 and the ground plate 330 contain a highly conductive material and can conduct electricity to each other. The proposed antenna device 300 has the advantage of providing a wide bandwidth when the antenna device 300 is attached to a metal plate.

[0048] An antenna device 300 according to one embodiment includes an antenna plate 310, a ground plate 330 supporting the antenna plate 310, and an impedance matching circuit for impedance matching of the antenna device 300, wherein the area of ​​the upper surface of the antenna plate 310 is formed in a ratio predetermined by the resonant frequency for communication, and the impedance matching of the antenna device 300 is adjusted based on the distance between the feeding line and the ground line connected to the antenna plate 310. The antenna plate 310 may be grounded to the ground plate 330. The antenna device 300 may further include a communication circuit that analyzes the signals transmitted and received via the antenna plate 310 and determines whether communication is possible. The communication circuit analyzes the signal received via the antenna plate 310 to identify the bit error rate and determines whether communication is possible based on the comparison result between the identified bit error rate and a threshold. The impedance matching circuit may be located within the shield section 340, which includes a metal material.

[0049] A wireless communication device according to one embodiment (for example, the wireless communication device 200 shown in Figure 2) includes an antenna device 300, a processor 210 that processes signals transmitted and received via the antenna device 300, and a communication module 230 that transmits the signals processed by the processor 210 to a communication terminal device. A wireless communication device including an antenna device 300 according to one embodiment can be used in the following fields, but is not limited thereto.

[0050] <Ship> Ships are made of metal, and wireless communication is not smooth inside them.

[0051] Therefore, wired communication systems, primarily consisting of installed wired cables, are the majority of communication systems on board ships. However, such wired communication networks require drilling holes in the bulkheads of ships, and the cables can reach lengths of tens of kilometers, resulting in high installation and maintenance costs. Furthermore, despite the presence of wired communication networks, communication shadow areas still exist, threatening the safety of sailors and workers.

[0052] Recently, autonomous ships and smart ships have become a major issue, requiring a wide variety of sensors and other technologies. These types of sensors require cables for communication, but as smarter functionality becomes more demanding, more sensors are needed, which in turn necessitates a greater number of cables. Furthermore, these types of cables incur significant costs. As a result, the need for data communication on ships is increasing, and the cost of cabling is also rising.

[0053] Furthermore, power lines for various devices are supplied via wired connections. Therefore, ships contain many cables for wired communications and power lines, and significant costs are required for their installation and maintenance.

[0054] Warships also face similar problems as described above, and unlike merchant ships, they are made up of many bulkheads, making the costs associated with wired communication networks and inter-shipment issues even more serious.

[0055] In order to solve the above problems, the present invention provides:

[0056] The wired communication network on a ship can be replaced with a wireless communication network by removing the cables. Replacing existing networks with wireless networks reduces cable-related costs. In other words, reducing the cost of cable installation will lead to a reduction in construction costs and construction time, lower cable maintenance costs, and a reduction in the ship's weight through the reduction in cable weight, which will result in lower fuel costs.

[0057] Furthermore, the communication issues arising from the accelerating smartification of ships can be resolved through wireless networks, enabling the smartification process to proceed smoothly and successfully. Furthermore, by utilizing this invention, power can be supplied wirelessly, and the elimination of numerous power lines within the ship will result in significant cost reductions.

[0058] The proposed wireless communication device makes it possible to relay wireless communications in structures where conventional wireless communication is impossible or difficult. Therefore, the cost and structural weight of wired wiring in conventional wireless shadow areas / environments are significantly improved.

[0059] <container> A typical example of transporting and storing goods through a space shaded by metal is a container. A container is a rectangular, box-shaped container made of metal, used for the efficient and economical transport of goods. In various industrial settings today, different types of containers are used to transport large quantities of goods more quickly. Containers facilitate the convenient transport of various types of cargo.

[0060] On the other hand, if a container is used for export or import abroad, or if it is loaded with goods that require a specific environment to be continuously maintained inside the container, the internal conditions of the container must be continuously managed. Recently, there has been an increasing need for real-time monitoring of location, internal temperature / humidity, shock, door opening / closing, and deviations from the transport route for container cargo in global land / sea transport. There is also a growing demand for high-quality services such as secure transport (theft prevention) and cargo condition information.

[0061] The problems with conventional management systems are as follows:

[0062] Firstly, it fails to consider both internal and external factors of the container in a comprehensive manner. The goods loaded inside a container are affected not only by environmental factors inside the container but also by external factors (such as the influx of outside air). For example, when using a refrigerant to maintain a low internal temperature, there are problems not only with the deterioration of the refrigerant itself (internal factors), but also with the leakage of cold air to the outside due to gaps between the container's opening and closing doors and the main body (e.g., when the doors are opened and closed), which prevents the proper temperature from being maintained (external factors).

[0063] Secondly, it cannot manage containers while considering their respective priorities. When multiple containers are used to move goods, some containers may need to be managed with higher priority, but if priority is not considered, management problems will arise.

[0064] Thirdly, refrigerated containers must be constantly powered, and power is also needed for the equipment required for smart containers. Therefore, power cables are always necessary, and problems can arise in cargo management if the power supply is cut off during container movement. Furthermore, the batteries for the container equipment also need to be charged, but the method for charging them is not readily available.

[0065] Fourthly, real-time control is difficult on ships due to the challenges of wireless communication, and in particular, there are problems with smooth communication in the lower containers of container ships.

[0066] This invention enables communication between the inside and outside of a container via a proposed wireless communication device, allowing for internal monitoring of the container and acquisition of the container's location information. Furthermore, because it can be charged wirelessly, it enables a continuous power supply and battery charging, making luggage management easier.

[0067] <Rear camera and surround view of the vehicle> As the number of vehicles increases, blind spots widen, and in particular, large vehicles cannot see anything without a rear camera that covers about 15 meters behind them, so there is always a risk when reversing. Conventional wired rear cameras can incur additional costs due to cable installation and maintenance. The weaknesses of exposed data cables (wiring damage, short circuits) and the inefficiencies of installation (time, cost) have been pointed out, and there is a continuing demand for an around-view approach to wireless communication infrastructure. Furthermore, conventional wired rear cameras have limitations in terms of ease of installation and use, as well as cost inefficiency, which has created a demand for detachable rear cameras with wireless communication infrastructure. However, existing RF (Radio Frequency) wireless communication technologies such as Zigbee, Bluetooth, and Wi-Fi have problems that make them difficult to apply due to noise, interference from surrounding interference frequencies, and video interference. They are also unsuitable because they create shadow areas due to radio wave diffraction, and wireless communication is not performed smoothly when containers are loaded due to the metal bodies of the containers. Therefore, solutions to overcome these problems are needed.

[0068] In the case of a container trailer, the tractor, trailer, and container are all owned by different people. Drivers who require a rear camera or surround view camera, as the tractor owner, must install the necessary cameras on the trailer or container, meaning they must be newly installed each time they operate the vehicle and retrieved afterward. Therefore, it is not suitable for users who receive and operate new containers every day, resulting in low convenience and a lack of market appeal. Furthermore, because the finished vehicle cannot be produced together with the trailer, the installation of surround-view cameras is essentially impossible, meaning drivers have to purchase and install them themselves.

[0069] Furthermore, the need for equipment that indicates blind spots has emerged in order to ensure the stable performance of military vehicles. Installing an around-view system allows drivers to monitor areas that are not visible in the rearview or side mirrors, making it an essential feature for military vehicles that frequently perform missions. To compensate for the weaknesses of existing wired / wireless camera systems, there is a need for tactically superior wireless surround-view systems.

[0070] In this invention, the proposed wireless communication device can be used to eliminate wired cables for a vehicle's camera system, enabling the configuration of a rear camera and surround-view system wirelessly. Furthermore, it overcomes the shortcomings of conventional wireless communication methods, improving communication reliability, and is easy to attach and detach, thus overcoming the inefficiencies of conventional wired cameras.

[0071] <Cold Chain Truck Control> In recent years, with the rapid increase in online deliveries due to the transition to an untact society, real-time control of temperature / humidity, shock, and location in cold chain logistics (fresh food, pharmaceuticals, etc.) has attracted attention. Therefore, there is a growing need to improve the smooth communication and security of IoT data within trucks. Furthermore, ensuring the reliability of cold chain data during transport is crucial, including preventing manipulation of temperature data in cold chain trucks. Proactive measures (such as discarding Covid vaccines) are also necessary to prevent temperature deviations during transport in cold chain trucks. However, with conventional communication methods, communication between the inside and outside of transport vehicles is incomplete, and real-time control is not possible.

[0072] This invention enables real-time communication between the inside and outside of a transport vehicle via the proposed wireless communication device, allowing for real-time control of cold chain data and monitoring of the freshness and location of cargo.

[0073] <Nuclear Power Plant> The radiation zones of nuclear power plants are complexly constructed with metal structures, concrete partitions, and other materials. As a result, although communication between radiation zones and non-radiation zones is based on wired connections due to radio interference, the wired communication network in radiation zones becomes unusable due to cable degradation during radioactive leaks. By utilizing the communication function of the wireless communication device of the present invention, which uses various pipes in a radiation zone as a communication medium, it can be used as an emergency communication network when the wired network becomes unusable.

[0074] <Other fields> Chemical industrial parks, factories, construction sites, tanks, etc.: In these industrial sites, numerous pipes or metal objects cause radio interference, preventing smooth wireless communication. Such problems can be solved by using the wireless communication device of the present invention, which uses a metal body as a communication medium.

[0075] In the case of buildings, there are wireless communication shadow areas, such as underground parking lots within the building. Therefore, significant costs are required for the installation and maintenance of cables in order to set up small base stations and other similar devices. Such costs can be reduced if the wireless communication device of the present invention utilizes metal such as steel frames or pipes in buildings.

[0076] Furthermore, while many wired communication networks are required for safety and fire safety within buildings, the wireless communication device of the present invention can replace these with simple installation and low cost.

[0077] In the case of oil pipelines, many devices are used to prevent crude oil leaks, theft, and other issues. This device utilizes a wireless network to transmit data to a server, but if the oil pipelines are installed underground, both wired and wireless connections become difficult. By utilizing the wireless communication device of the present invention, which uses the metal body of the oil supply pipe as the medium, data can be smoothly collected from the communication device even underground.

[0078] Although embodiments of the present invention have been described in detail above with reference to the drawings, the present invention is not limited to the embodiments described above, and any person with ordinary skill in the art can apply various technical modifications and variations based on them. For example, the described techniques may be performed in a different order than described, and / or the components of the described systems, structures, devices, circuits, etc. may be combined or assembled in a different manner than described, or substituted or replaced by other components or equivalents, and still the appropriate results may be achieved.

[0079] Therefore, the scope of the present invention is not limited to the disclosed embodiments, but is defined by the claims and equivalents thereof. [Explanation of Symbols]

[0080] 100...ship 110,120... Wireless communication devices 130, 140... Cable 135, 145... RF barrier (RF coupler) 150, 160... Antenna equipment 200... Wireless communication devices 210... Processor 220...memory 230...Communication module 240... Antenna equipment 250... Display Module 260... Communications bus 300... Antenna equipment 310... Antenna plate 320...Support part 330... Ground Plate 340...Shield section 350... Ground line 355...Feeding Line 360... gap or interval 370... Length of the top surface of the antenna plate

Claims

1. An antenna device that adheres to a metal body and communicates using the metal body as a medium, An antenna plate with a square-shaped top surface, A ground plate in contact with the metal surface of the metal body is provided to support the antenna plate and to communicate using the metal body as a medium. A support portion for maintaining a constant distance between the antenna plate and the ground plate and for supporting the antenna plate, the support portion comprising a dielectric made of a non-metallic material, The antenna device includes an impedance matching circuit for impedance matching, The impedance matching of the antenna device is adjusted based on the distance between the feeding line and the ground line connected to the antenna plate and the impedance matching circuit. The feeding line and the ground line are arranged parallel to the support portion. The feeding line is connected to the impedance matching circuit, The impedance matching circuit is located within a shielding section containing a metal material, which is provided on the ground plate, in this antenna device.

2. The antenna device according to claim 1, wherein the antenna plate is grounded to the ground plate.

3. The antenna device according to claim 1, further comprising a communication circuit that analyzes signals transmitted and received via the antenna plate and determines whether communication is possible.

4. The antenna device according to claim 3, wherein the communication circuit analyzes the signal received through the antenna plate to identify the bit error rate and determines whether communication is possible based on the comparison result between the identified bit error rate and a threshold.

5. A wireless communication device, A wireless communication device comprising: an antenna device according to claim 1; a processor for processing signals transmitted and received via the antenna device; and a communication module for transmitting the signals processed by the processor to a communication terminal device.

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