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] The present 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 requires holes to be made in the bulkheads of the ship, and the length of the cable may reach several tens of kilometers, so the installation and maintenance costs are high. In addition, even though a wired communication network is installed, there are still communication shadow areas, making it difficult for crew members and workers to communicate, which may pose a threat to the safety of crew members and workers. In addition, inside the ship, 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 ship, and a lot of costs are required for providing and maintaining the 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, and huge metal structures such as oil pipelines.

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 includes an antenna plate, a ground plate that supports the antenna plate, and an impedance matching circuit for impedance matching of the antenna device. The area of the upper surface of the antenna plate is formed at a ratio specified in advance by a resonance frequency for communication. The impedance matching of the antenna device is adjusted based on the distance between a feeding line and a ground line connected to the antenna plate.

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

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

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

[0009] A wireless communication device according to an embodiment includes the antenna device according to claim 1, a processor that processes a signal transmitted and received via the antenna device, and a communication module that transmits a signal processed by the processor to a communication terminal device.

Advantages 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 Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 3C

Figure 3D

Mode for Carrying Out the Invention

[0012] The specific structural or functional description of the embodiment is disclosed for the purpose of mere exemplification and can be changed into various forms. Therefore, the embodiment is not limited to the specific disclosed form, and the scope of this specification includes changes, equivalents or alternatives included in the technical idea described in the embodiment.

[0013] Terms such as first or second may be used to describe a plurality of components, but such terms must be interpreted only for the purpose of distinguishing one component from another. 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 any component is “connected” to another component, it should be understood that it is directly connected or connected to the other component, but there may be other components in between.

[0015] Singular expressions include plural expressions unless the context clearly gives a different meaning. 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 be understood not to preclude in advance 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 as having an ideal or overly formal meaning unless clearly defined herein.

[0017] The term "module" as used herein includes units embodied 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 integrated component, or the smallest unit or a part of the component that performs one or more functions. For example, according to one embodiment, a module is embodied in the form of an ASIC (application-specific integrated circuit).

[0018] The term "~ part" as used herein means a software or a hardware component such as an FPGA or an ASIC, and the "~ part" plays a certain role. However, the "~ part" is not limited in meaning to software or hardware. The "~ part" may be configured to be in an addressable storage medium, or may be configured to cause one or more processors to execute. For example, the "~ 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 components and the functions provided within the "~ part" can be combined with a smaller number of components and the "~ part", or can be further divided into additional components and the "~ part". In addition, the components and the "~ part" may be embodied to cause one or more CPUs within a device or a secure multimedia card to execute. Also, the "~ part" may include one or more processors.

[0019] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. When describing with reference to the drawings, the same components will be given the same reference numerals regardless of the drawing symbols, and duplicate descriptions thereof will be omitted.

[0020] FIG. 1 is a diagram for explaining an installation example of a wireless communication device in a ship according to an embodiment.

[0021] Referring to FIG. 1, wireless communication devices 110 and 120 according to an embodiment can communicate using a metal body as a medium. The wireless communication devices 110 and 120 provide a communication relay function through communication using a metal body as a medium. The wireless communication device can receive signals and / or data from a communication terminal device (e.g., a wireless device) connected to the wireless communication device, and transmit the received signal data to another wireless communication device using a metal body as a medium. The wireless communication devices 110 and 120 can efficiently perform wireless communication using a metal body as a medium in a communication shadow environment where communication using radio waves is difficult, such as in a ship, a container, or a trailer. The wireless communication devices 110 and 120 can be attached to the metal hull of the ship 100, form an electromagnetic field on the metal hull, and include an antenna device that places the voice data received from a data processing unit (e.g., a processor) on the electromagnetic field and propagates it 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 through the metal body, and the wireless communication devices 110 and 120 can transmit the received signals and / or data to the communication terminal device through their own communication channels.

[0022] To explain the principle by which signals and / or data are transmitted through the metal body, it is as follows. The medium of the metal body may be, for example, the steel plate or frame structure of the hull. It will be described by classifying the case where the medium of the metal body is a magnetic material and the case where it is a diamagnetic material.

[0023] When the medium of the metal body is a magnetic material, the conductive layer of the first antenna forms an electromagnetic field on the dielectric layer. Then, due to this electromagnetic field, a magnetic-field-dominant electromagnetic field is formed in the metal-body medium, which is a radio-wave medium. Among the generated electromagnetic fields, the electric field E1 propagates in a direction perpendicular to the medium of the metal body through the aperture surface of the first antenna. The propagated electric field E1 forms an electromagnetic field B in which the magnetic field is dominant in the medium of the metal body.

[0024] Then, according to the reciprocity theorem, the second antenna on the receiving side receives energy from the electromagnetic field formed in the medium of the metal body with a similar structure and principle. In such a process, the change in the electromagnetic field B in which the magnetic field is dominant is transmitted from the dielectric layer to the electromagnetic field E2 in which the magnetic field is dominant through the aperture surface of the second antenna.

[0025] In such communication using the metal body as the medium (also referred to as metal-body communication), since the magnetic field is dominant, even if the form and size of the medium of the metal body change, the change in impedance is small. In addition, since the medium of the metal body has a permeability greater than that of air, the radio wave transmission efficiency is superior to that of a communication system propagating in air. Therefore, the communication distance through the medium of the metal body, which is a magnetic material, is even farther than that of magnetic field communication through air. In order to form an electromagnetic field dominated by a magnetic field, the resonance part and the circuit part of the wireless relay device must be designed so that an electric field of a certain magnitude is formed inside the metal body.

[0026] Energy can be transmitted from the medium of the metal body to a resonator at a certain distance from the medium of the metal body by the electromagnetic field formed in the medium of the metal body. Since the electromagnetic field formed in the medium of the metal body is dominated by a magnetic field, an electric field is radiated from the medium of the metal body. Therefore, when an antenna resonating at the operating frequency is within a certain distance from the medium of the metal body, energy can be received.

[0027] The dielectric of the dielectric layer of the first antenna or the second antenna can reduce the thickness and size of the resonance part, and form an electromagnetic field B in which the magnetic field is dominant in the medium of the metal body, so that sufficient energy can be transmitted.

[0028] When the medium of the metal body is a paramagnetic substance or a diamagnetic substance, the current fed to the conductive layer side forms an electromagnetic field E1 in which the electric field is dominant in the medium of the metal body. Here, the electric field radiated from the aperture surface cannot form an electromagnetic field B in which the magnetic field is dominant inside the metal body. Regarding this, since the permeability of paramagnetic substances and diamagnetic substances is similar to that of air, the metal body media of paramagnetic substances and diamagnetic substances do not have stronger radio waves of magnetic fields in air like in the case of ferromagnetic substances, and are propagated with a similar magnitude. In other words, the propagation distances in air or inside the metal body are similar.

[0029] In the case of pure iron which is a ferromagnetic material, the magnetic permeability is 4,000 to 5,000. However, for aluminum which is a paramagnetic material and silver (Ag) which is a diamagnetic material, the magnetic permeability is about 1.0, and the intensity of the magnetic field radio wave inside the metal body is different. Therefore, in this case, among the conductive layers of the antenna, a signal is propagated to the receiver by the current induced in the metal body medium from the layer in contact with the metal body medium. Here, the electric field radiated from the aperture surface is induced in the metal body, and thereby, a signal or power is transmitted.

[0030] In the case of a structure having a metal structure as the main structure such as the ship 100 (for example, an LNG ship) as shown in FIG. 1, radio waves cannot pass through the metal, and reflection and / or attenuation phenomena occur, and wireless communication may not be smoothly performed. Therefore, in the case of a structure made of a metal structure, a wireless communication shadow area where wireless communication is difficult or impossible may occur. For example, in the pipe duct, engine room, bosun store, engine control room (ECR), bow thruster room, etc. of an LNG ship, a wireless communication shadow area may occur. Here, what is most necessary is a relay device that can be used between an area where radio waves are easily radiated in the air and general wireless communication is smoothly performed, such as a cargo control room (CCR), a bridge, a compass deck, a living quarter including an upper deck, etc., and the wireless communication shadow area. The wireless communication devices 110 and 120 according to an embodiment play a role of relaying communication between a wireless communication possible area and a wireless communication shadow area.

[0031] Assume that there is a position in the ship 100 where the wireless communication devices 110 and 120 cannot be installed. The wireless communication devices 110 and 120 are provided at positions within the ship 100 where they can be installed, and the antenna devices 150 and 160 (for example, the antenna device 300 in FIG. 3A) proposed in the present disclosure can be installed via cables 130 and 140 (for example, RF cables). The antenna device 150 is connected to the wireless communication device 110 via the cable 130, and the antenna device 160 is connected to the wireless communication device 120 via the cable 140. In the explosion-proof area, the antenna devices 150 and 160 can also be installed via RF barriers (or RF couplers) 135 and 145.

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

[0033] Referring to FIG. 2, the wireless communication device 200 corresponds to the wireless communication devices (for example, the wireless communication devices 110 and 120 shown in FIG. 1) described in the present disclosure. The wireless communication device 200 includes a processor 210, a memory 220, a communication module 230, an antenna device 240 (for example, the antenna devices 150 and 160 shown in FIG. 1, the antenna device 300 shown in FIG. 3A), and a 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 (for example, hardware or software components) of the wireless communication device 200 and perform various data processing or operations. According to one embodiment, as at least a part of the data processing or operation, 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 result data in the memory 220.

[0035] The processor 210 may include a main processor (e.g., a central processing unit or an application processor) or an auxiliary processor (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) that can operate independently or together with it.

[0036] The memory 220 can store various data used by components of the wireless communication device 200 (e.g., the processor 210 or the communication module 230). The data may include, for example, programs (e.g., applications), input data and / or output data of related instructions, signals and / or data received from a communication terminal device. The memory 220 stores instructions executable by the processor 210. The memory 220 may include a volatile memory or a 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 is operated 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 performing wireless communication.

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

[0039] In one embodiment, the processor 210 checks whether communication through the wireless communication device 200 is possible. 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 communication availability 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 (received signal strength indicator; RSSI) of the 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 higher the received signal strength, the better the communication sensitivity. As a different example, the processor 210 checks the bit error rate of the received signal (e.g., digital signal), and may display via the display module 250 that communication is possible until the bit error rate falls below a specific threshold. For example, if the bit error rate exceeds 3%, it may be determined that communication is not possible, but the specific numerical value is not limited. The bit error rate indicates how many bits of the received signal are corrupted or to what extent an error has occurred.

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

[0041] In the proposed wireless communication system, a function of relaying signals on the same communication channel can be provided. A communication terminal device (for example, a digital radio terminal) usually has a function of transmitting / receiving an audio signal or a data signal, but signal transmission is not smoothly performed in a wireless communication shadow area. For extending the communication distance of such a communication terminal device, a device (for example, the wireless communication device 200) that relays signals on the same channel and transmits signals over a long distance can be applied to the corresponding wireless communication system.

[0042] FIGS. 3A, 3B, 3C, and 3D show structural diagrams of an antenna device according to an embodiment.

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

[0044] Referring to FIGS. 3A, 3B, 3C, and 3D, the antenna device 300 functions as an antenna device of the wireless communication devices (for example, the wireless communication devices 110 and 120 shown in FIG. 1, the wireless communication device 200 in FIG. 2) described in the present disclosure. In one embodiment, the antenna device 300 may have a height within a preset 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 contacts the target metal surface. The ground plate 330 may include, for example, a ground brass considering the target frequency for communication. The ground plate 330 may serve as an antenna body. The area of the antenna plate 310 is formed in a ratio specified in advance by the resonance frequency required for communication. By adjusting the area of the antenna plate 310, an appropriate antenna can be designed for any resonance 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 adjust the matching value through the gap or interval 360 between the feeding line 355 and the ground line 350 and the impedance matching circuit. The circuit (for example, including the processor 210 shown in FIG. 2) connected to the antenna device 300 can analyze the signal received through the antenna device 300 and predict whether communication is possible.

[0046] The antenna device 300 includes a support portion 320 that maintains a certain interval between the ground plate 330 and the antenna plate 310 and supports the antenna plate 310. The support portion 320 may include, for example, an auxiliary dielectric of a non-metallic material (for example, polycarbonate (PC)), and can keep the metal height of the antenna plate 310 constant. 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. Also, by adjusting the length 370 of the antenna plate 310, the operating frequency of the desired 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 the shield portion 340. The shield portion 340 may include, for example, an aluminum material, and the impedance matching circuit may be disposed 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 include a highly conductive material and can be electrically conductive 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] The antenna device 300 according to one embodiment includes an antenna plate 310, a ground plate 330 that supports the antenna plate 310, and an impedance matching circuit for impedance matching of the antenna device 300. The area of the upper surface of the antenna plate 310 is formed at a ratio specified in advance by the resonance 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 signals 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 value. The impedance matching circuit may be disposed within a shield portion 340 including a metal material.

[0049] A wireless communication device according to an embodiment (e.g., the wireless communication device 200 shown in FIG. 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 the antenna device 300 according to an embodiment is utilized in the following fields, but is not limited thereto.

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

[0051] Therefore, inside ships, mainly wired communication systems with wired cables installed are mostly used. However, such a wired communication network has to make holes in the ship's bulkheads, and the cable length reaches dozens of kilometers, so installation and maintenance cost a great deal. Moreover, despite the presence of a wired communication network, there are still communication shadow areas, threatening the safety of crew members and workers.

[0052] Recently, autonomous operation ships and smart ships have become issues, and for this purpose, various and many sensors, etc. are required. Such sensors require cables for communication, but the more smart functions are required, the more sensors are required, resulting in a large number of cables being needed. Moreover, such cables cost a lot. As a result, data communication inside ships has a higher necessity, and the cost of cables has further increased.

[0053] Also, power lines for the power of various devices are supplied in a wired manner. Therefore, there are many cables for wired communication and power lines inside ships, and a great deal of cost is required for their installation and maintenance.

[0054] Warships also have similar problems as described above. Different from merchant ships, they are formed with many bulkheads, and the costs associated with wired communication networks and problems between construction vessels are more severe.

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

[0056] The cables in the wired communication network inside the ship can be removed and replaced with a wireless communication network. By replacing it with a wireless network, the cost of cables is reduced. That is, by reducing the cost related to cable installation, the construction cost and construction period are reduced, the maintenance cost of the cables is reduced, and the weight of the ship is reduced by reducing the weight of the cables, which enables the reduction of fuel costs and the like.

[0057] In addition, communication issues caused by the acceleration of ship smartening can be solved by the wireless network, enabling the smooth success of smartening. Moreover, by utilizing the present invention, power can be supplied wirelessly, and a large number of power lines inside the ship can be removed, enabling epoch-making cost reduction.

[0058] When the proposed wireless communication device is used, wireless communication can be relayed in structures where conventional wireless communication is impossible or difficult. Therefore, the costs for wired wiring and the weight of structures in conventional wireless shadow areas / environments are significantly improved.

[0059] <Container> A typical example of transporting and storing items through a space shadowed by metal is a container. A container means a rectangular box-shaped container made of a metal material used for efficiently and economically transporting goods. In various current industrial sites, various containers for suitable materials are used to transport large amounts of goods more quickly. Containers facilitate the transportation of various goods.

[0060] On the one hand, when the container is used for foreign export or import, or when the container is loaded with goods that require a specific environment to be continuously maintained inside, the internal situation of the container must be continuously managed. Recently, for containerized cargo in global overland / sea transportation, the need for information monitoring regarding real-time location information, internal temperature / humidity, and impacts, door opening / closing, and deviation from the transfer route has been increasing, and the demand for high-quality services such as the safe transportation of goods (theft prevention) and cargo status information has also been increasing.

[0061] The problems of the conventional management system are as follows.

[0062] First, it does not comprehensively consider the internal and external factors of the container. The goods loaded inside the container are affected not only by the environmental factors inside the container but also by external factors of the container (for example, the inflow of external air, etc.). For example, as a method of maintaining a low internal temperature using a refrigerant, when adjusting the internal environment of the container, there are not only problems due to the deterioration of the refrigerant itself (internal factor), but also problems where cold air leaks to the outside through the gap between the opening / closing door and the main body of the container (for example, door opening / closing), making it impossible to maintain an appropriate temperature (external factor).

[0063] Second, it cannot be managed considering the priority among containers. When multiple containers are used for the movement of goods, there may be containers that must be managed with higher priority. However, if the priority is not considered, management problems will occur.

[0064] Third, the refrigerated container must always be supplied with power, and power is also required for the devices for smart containers. Therefore, a power cable is always required, and problems may occur in cargo management when the power supply is cut off during the movement of the container. In addition, the battery for the container device also needs to be charged, but the method for charging is not easy.

[0065] Fourthly, in ships, real-time control is difficult due to the difficulty of wireless communication. In particular, there is a problem that communication is not smooth for the lower containers of container ships.

[0066] In the present invention, communication between the inside and outside of the container is enabled via the proposed wireless communication device, and the internal monitoring of the container and the position information of the container can be grasped. And since it can be wirelessly charged, continuous power supply and battery charging become possible, making luggage management easier.

[0067] <Rear camera and around view of vehicle> As vehicles increase, the blind spots become wider. In particular, for large vehicles, there is no rear camera about 15 m behind, so there is always a danger during reverse driving. Conventional wired rear cameras can incur additional costs due to cable installation and maintenance. The weaknesses of data cables exposed to the outside (wiring damage, short circuit) and the limitations of inefficiency in installation (time, cost) have been pointed out, and the demand for an around view based on a wireless communication infrastructure has been continuously emerging. And since conventional wired rear cameras have limitations in terms of installation, usability, and cost inefficiency, there is a demand for a detachable rear camera based on a 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 issues such as noise, interference from surrounding interfering frequencies, and video crosstalk. They are not suitable due to the occurrence of shadow areas caused by radio wave diffraction, and wireless communication cannot be smoothly performed due to the metal body of the container when containers are stacked, so a solution to overcome this is required.

[0068] In the case of a container trailer, the owners of the tractor, trailer, and container are different. For a driver who needs a rear camera or an around-view, since the camera necessary for operation as the owner of the tractor must be installed on the trailer or container, it must be newly installed every time it is operated and retrieved again after operation. Therefore, it is not suitable for users who have new containers delivered and operated every day, so its convenience is low and it is shunned by the market. In addition, since a completed vehicle cannot produce a trailer together, it is basically impossible to install an around-view, and the driver has to purchase and install it additionally.

[0069] In addition, for the stable mission execution of military vehicles, the need for equipment indicating blind spots has emerged. If an around-view system is installed, parts that cannot be seen in the rearview mirror or side mirror can be confirmed with a monitor, which is an essential item for military vehicles that perform tasks frequently. A tactically excellent wireless around-view is required to complement the weaknesses of existing wired / wireless communication method cameras.

[0070] In the present invention, a wired cable for a vehicle camera system can be removed using the proposed wireless communication device, and a rear camera and an around-view system can be configured wirelessly. In addition, it overcomes the disadvantages of conventional wireless communication methods, improves communication reliability, is easy to detach and attach, and can overcome the inefficiency of conventional wired cameras.

[0071] <Cold Chain Truck Control> In recent years, due to the rapid increase in online deliveries with the shift to a contactless society, real-time control of temperature / humidity maintenance, shock, position, etc. of cold chain logistics (fresh food, pharmaceuticals, etc.) has attracted attention. Therefore, the needs for activating smooth communication of IoT data in trucks and improving safety are increasing. In addition, ensuring the reliability of cold chain data during transportation, such as temperature data operation of cold chain trucks, is required, and prior countermeasures (such as Covid vaccine disposal) before temperature deviation during transportation of cold chain trucks are also necessary. However, in the conventional communication method, the communication between the inside and outside of the transport vehicle is incomplete, and real-time control is not performed.

[0072] In the present invention, real-time communication between the inside and outside of the transport vehicle is enabled via the proposed wireless communication device, and the freshness, position, etc. of the goods can be monitored by real-time control of cold chain data.

[0073] <Nuclear power plant> The radiation area of a nuclear power plant is complexly composed of metal structures, concrete partitions, etc. As a result, the communication between the radiation area and the non-radiation area due to radio wave interference is configured by wire, but when radioactive substances leak, the wired communication network in the radiation area becomes unusable due to cable deterioration. By utilizing the communication function of the wireless communication device of the present invention using various pipes in the radiation area 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, radio wave interference occurs due to numerous pipes or radio wave obstacles made of metal, and wireless communication cannot be smoothly performed. By using the wireless communication device of the present invention that communicates using a metal body as a medium, such problems can be solved.

[0075] In the case of a building, there are wireless communication shadow areas such as underground parking lots inside the building. Therefore, a lot of costs are required for cable installation and maintenance to install a small base station, etc. If the metal such as the steel frame or pipe of the building is utilized for the wireless communication device of the present invention, such costs can be reduced.

[0076] In addition, many wired communication networks are required for safety and fire protection within a building. However, by utilizing the wireless communication device of the present invention, this can be replaced with simple construction and low cost.

[0077] In the case of an oil pipeline, many devices are used in the oil pipeline to prevent oil leakage, theft, etc. of the crude oil in the oil pipeline. This device utilizes a wireless communication network to transmit data to a server. However, when the oil pipeline is installed underground, both wired and wireless communication become difficult. If the wireless communication device of the present invention that uses the metal body of the oil pipeline as a medium is utilized, data can be smoothly collected from the communication device even if it is underground.

[0078] As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and those with ordinary knowledge in the technical field can apply various technical modifications and deformations based thereon. For example, the described technology may be executed in a different order from the described method, and / or the components such as the described system, structure, device, circuit, etc. may be combined or assembled in a different form from the described method, or replaced or substituted by other components or equivalents, and appropriate results can still be achieved.

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

Description of Reference Numerals

[0080] 100 ··· Ship 110, 120 ··· Wireless communication device 130, 140 ··· Cable 135, 145 ··· RF barrier (RF coupler) 150, 160 ··· Antenna device 200 ··· Wireless communication device 210 ··· Processor 220 ··· Memory 230 ··· Communication Module 240 ··· Antenna Device 250 ··· Display Module 260 ··· Communication Bus 300 ··· Antenna Device 310 ··· Antenna Plate 320 ··· Support Part 330 ··· Ground Plate 340 ··· Shield Part 350 ··· Ground Line 355 ··· Feeding Line 360 ··· Gap or Interval 370 ··· Length of the Upper Surface of the Antenna Plate

Claims

1. 1. An antenna device, comprising: 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 ​​the upper surface of the antenna plate is formed in a ratio that is predetermined according to a resonant frequency for communication, An antenna device, wherein impedance matching of the antenna device is adjusted based on a distance between a feeding line and a ground line connected to the antenna plate.

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 for analyzing a signal transmitted and received through the antenna plate to determine whether communication is possible.

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

5. 1. A wireless communication device, comprising:

10. A wireless communication device comprising: the antenna device according to claim 1; a processor that processes signals transmitted and received via the antenna device; and a communication module that transmits signals processed by the processor to a communication terminal device.

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