Easy-to-carry flip-type beam steering phased array antenna device
Patent Information
- Application Number
- PCT/KR2024/009955
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-08-04
- Filing Date
- 2024-07-11
- Publication Date
- 2025-02-13
Smart Images

Figure KR2024009955_13022025_PF_FP_ABST
Abstract
Description
Portable flip-type beam steering phased array antenna device
[0001] The present invention relates to a portable flip-type beam steering phased array antenna device, and more specifically, to a portable flip-type beam steering phased array antenna device that supplies power for a certain period of time to enable the antenna to operate even in a situation where the supply of external power is inevitably interrupted or unavailable, and that is portable and enables rapid communication even in areas where communication is cut off or where it is difficult to install communication equipment, such as mountainous or remote areas.
[0002] As communication technology advances due to the advancement of information and communication technology and the Fourth Industrial Revolution, the spread of communication systems that enable the rapid transmission of large amounts of information is expanding.
[0003] Recently, as the dependence on communication systems has increased not only in daily life but also in industrial environments, and the scope of human activities has expanded, systems that enable communication in mobile environments such as smartphones and tablets have become the basic form, breaking away from static systems such as PCs and landlines in the past. Recently, the need for mobile phased array flat panel satellite antennas that enable data communication via satellite while moving to enable smooth communication even in ships or vehicles is increasing.
[0004] However, in the case of conventional mobile satellite antennas, in remote or mountainous areas where movement by ships or vehicles is impossible, if the existing communication system is lost or a communication network has not been established, a person must personally carry the satellite dish and move to the area, which causes many inconveniences, and problems such as the satellite dish being damaged during movement occur.
[0005] Additionally, in areas where communication restoration is required due to disasters or other calamities, there is a risk that power supply from outside may not be possible, or even if power is supplied, the power supply may be suddenly cut off due to a power outage or other reasons, making it impossible to operate the equipment or causing serious damage.
[0006] Therefore, a method to solve these problems is required.
[0007] [Prior Art Literature]
[0008] [Patent Document]
[0009] Republic of Korea Utility Model Registration No. 20-0259666
[0010] The present invention is an invention devised to solve the problems of the above-described prior art, and has a structure that folds or unfolds in a flip shape, thereby reducing the overall volume, and has a grip portion that makes it easy for a user to grip, thereby maximizing portability, and has a purpose of enabling continuous operation by supplying power on its own even when the external power is cut off, by using a battery module that is charged using power supplied from an external source.
[0011] In addition, the purpose is to control the phased array chip according to the satellite signal sensitivity and adjust the transmission and reception angle of the antenna module through software to enable stable communication at a low antenna height.
[0012] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.
[0013] In order to achieve the above object, the portable flip-type beam steering phased array antenna device of the present invention comprises: a plate-shaped antenna part for transmitting and receiving satellite signals in a beam steering phased array manner; a plate-shaped base part provided at a lower portion of the antenna part and capable of being connected to the antenna part, and having a power supply module for supplying power required for driving the antenna part; a rotation part in which one side of the antenna part and the base part facing each other are respectively coupled, and in order to smoothly transmit and receive satellite signals, the antenna part rotates according to satellite signal sensitivity to adjust the unfolding angle; and a grip part provided at one side of the rotation part so that the user can grip it, and in a state in which the base part is placed on the floor or a stand, the antenna part swings to unfold or fold about the rotation part as a reference axis, so that the unfolding angle for transmitting and receiving satellite signals in the antenna part is adjustable.
[0014] At this time, the antenna section includes a lower case, an upper cover coupled to the upper portion of the lower case, and an installation panel in which an antenna module having a flat plate shape to which a chip-shaped antenna element is coupled is installed, and a waterproof seal can be formed along the perimeter of the joint portion of the lower case and the upper cover.
[0015] In addition, the antenna module may further include a heat-conducting pad that prevents the performance of the antenna module from being deteriorated by heat generated during operation, with a plurality of phased array chips being installed on the upper surface of the installation panel as a group.
[0016] At this time, the installation panel has the antenna module and GPS unit installed on the upper surface, and an antenna control module that can be connected to the antenna module and the GPS unit on the lower surface to secure location information from the antenna module and the GPS unit and control the satellite signal so that smooth transmission and reception of satellite signals are possible even while moving is provided, and the lower surface of the installation panel may further include a protective cover that completely covers the antenna control module to prevent damage to the antenna control module and reduce signal loss.
[0017] In addition, the antenna unit may further include at least one fan module provided on the lower surface of the installation panel and configured to circulate air in the internal space so that heat generated between the operation of the antenna module and the antenna control module is discharged to the outside of the antenna unit.
[0018] At this time, the lower case is formed to face the fan module and may include at least one ventilation hole to allow the internal space to communicate with the outside.
[0019] In addition, the base part may further include a casing home into which the power supply module is inserted but detachably coupled, and a connector module that is provided to be exposed on one side so that external Ethernet and power lines can be connected.
[0020] At this time, the power supply module may include a mounting unit having a space in which a plurality of battery modules are mounted so as to be interconnected with each other, a circuit board unit provided on one side of the mounting unit to ensure smooth power supply to the battery modules, and a cover unit coupled to the upper portion of the mounting unit.
[0021] And the rotating part includes a fixed shaft unit that is fixedly coupled to the center of one side of the base part, a pair of connecting shaft units that are coupled to both ends of one side of the base part, and a pair of rotating shaft units that are respectively provided between the fixed shaft unit and the connecting shaft unit so as to be capable of rotating around a central axis, and to which the antenna part is coupled on one side so that the antenna part swings relative to the rotating part, and the fixed shaft unit, the connecting shaft unit, and the rotating shaft unit have a cylindrical shape and can be mutually coupled in the same longitudinal direction as one side of the base part.
[0022] At this time, the fixed shaft unit may be coupled to the grip part on the outside based on the base part, and the surface facing the grip part may be formed into a concave part formed inward so that the user can easily grip the grip part.
[0023] In addition, the connecting shaft unit may include a range recognition unit formed on one side of the outer surface, in which the rotational range of the rotating shaft unit is marked with a scale.
[0024] At this time, the rotation shaft unit may include an angle recognition unit formed on one side of the outer surface and directed toward the scale of the range recognition unit to recognize the rotation angle of the rotation shaft unit, thereby enabling detailed angle adjustment of the antenna unit.
[0025] In addition, the antenna unit and the base unit may further include a pair of shaft coupling units that are respectively coupled to the rotation shaft unit and the connection shaft unit.
[0026] The portable flip-type beam steering phased array antenna device of the present invention for solving the above-mentioned problem has the following effects.
[0027] First, it has a structure that unfolds and folds in a flip type, which minimizes the volume when moving, and it has a grip section, which has the advantage of maximizing portability.
[0028] Second, since multiple battery modules that can be charged by external power are installed inside, there is an advantage in that the antenna module can be operated for a certain period of time even when the external power is cut off or the external power supply is unavailable.
[0029] Third, it has the advantage of enabling more stable communication than the existing motor-based antenna position control, as it can be controlled by software through an antenna control module using a phased array chip according to the satellite signal sensitivity.
[0030] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.
[0031] FIG. 1 is an exemplary diagram showing an unfolded state of a portable flip-type beam steering phased array antenna device according to an embodiment of the present invention;
[0032] FIG. 2 is an exemplary diagram showing a portable flip-type beam steering phased array antenna device according to an embodiment of the present invention folded into a flip type and showing a grip portion;
[0033] FIG. 3 is an exploded perspective view showing the combined structure of a portable flip-type beam steering phased array antenna device according to an embodiment of the present invention;
[0034] FIG. 4 is an exploded perspective view showing the structure of an antenna section of a portable flip-type beam steering phased array antenna device according to an embodiment of the present invention;
[0035] FIG. 5a and FIG. 5b are exemplary diagrams showing an antenna module and an antenna control module installed on an installation panel in a portable flip-type beam steering phased array antenna device according to an embodiment of the present invention;
[0036] FIG. 6 is an exploded perspective view showing the structure of a base portion of a portable flip-type beam steering phased array antenna device according to an embodiment of the present invention;
[0037] FIG. 7 is an exploded perspective view showing the structure of a rotating part in a portable flip-type beam steering phased array antenna device according to an embodiment of the present invention; and
[0038] FIG. 8a and FIG. 8b are exemplary drawings showing the coupling relationship between the antenna unit, the base unit, and the rotating unit, and the appearance of adjusting the unfolding angle of the antenna unit by the rotating unit in a portable flip-type beam steering phased array antenna device according to an embodiment of the present invention.
[0039] Hereinafter, preferred embodiments of the present invention, which can specifically realize the objectives of the present invention, will be described with reference to the attached drawings. In describing the present embodiments, identical names and symbols will be used for identical components, and additional explanations thereof will be omitted.
[0040] The present invention relates to a portable flip-type beam steering phased array antenna device that supplies power for a certain period of time to enable the operation of an antenna even in a situation where the supply of power from an external source is inevitably interrupted or unavailable, and that is portable so as to enable rapid communication even in areas where communication is cut off or where it is difficult to install communication equipment, such as mountainous or remote areas.
[0041] The flip-type beam steering phased array antenna device according to the present invention, as illustrated in FIGS. 1 to 3, may include an antenna unit (100) formed in a plate shape capable of transmitting and receiving satellite signals in a beam steering manner, a plate-shaped base unit (200) provided at a lower portion of the antenna unit (100) and capable of being connected to the antenna unit (100) and having a power supply module (210) capable of supplying power required for driving the antenna unit (100), a rotation unit (300) in which one side of the antenna unit (100) and the base unit (200) can be respectively coupled to each other so as to face each other, and in which the antenna unit (100) can rotate according to the satellite signal sensitivity to adjust the unfolding angle for smooth transmission and reception of satellite signals, and a grip unit (400) provided at one side of the rotation unit (300) so that a user can grip it for carrying it while moving.
[0042] For example, as shown in FIGS. 1 and 2, when the base part (200) is placed on the floor or a stand, the antenna part (100) can swing around the rotation part (300) as a reference axis so that it can be unfolded or folded, so that the angle at which the satellite signal is transmitted and received by the antenna part (100) can be adjusted, and the volume can be minimized during movement so that portability can be maximized.
[0043] According to one embodiment of the present invention, the antenna unit (100) for transmitting and receiving satellite signals may be provided in a lower case (130), an upper cover (110) that can be coupled to the upper portion of the lower case (130), and an internal space that can be formed by coupling the lower case (130) and the upper cover (110), as illustrated in FIG. 4, and may include an installation panel (120) on which an antenna module (121) is installed, which is formed of a flat plate capable of coupling a plurality of phased array chip-type antenna elements.
[0044] At this time, it is preferable that a waterproof seal be formed around the joint of the lower case (130) and the upper cover (110), so that the waterproofing ability of the antenna unit (100) can be reinforced.
[0045] In addition, the antenna module (121) installed on the installation panel (120) may be provided with at least one heat-conducting pad to prevent the performance of the antenna module (121) from being deteriorated due to heat generated during operation. At this time, a heat-conducting tube such as a heat pipe may be embedded in the installation panel (120) to suppress heat generation of the antenna module (121) in connection with the heat-conducting pad, thereby stably maintaining the performance of the antenna module (121) and extending its lifespan.
[0046] In addition, the antenna module (121) may be formed in a single plate shape installed on one side of the installation panel (120), but is not limited thereto, and is preferably divided into a plurality of pieces so that partial replacement and maintenance can be easily performed, and interference between antenna elements can be minimized, but is installed in a group so that they can be interconnected to each other on the installation panel (120).
[0047] The above-described installation panel (120) can have the antenna module (121) described above installed on the upper surface, and a GPS unit (122) is additionally provided on one side to receive location information through GPS coordinates.
[0048] In addition, an antenna control module (123) that can be connected to the antenna module (121) and the GPS unit (122) and controls satellite signals so that smooth transmission and reception of satellite signals can be achieved in the antenna module (121) may be provided on the lower surface of the installation panel (120).
[0049] In addition, the antenna control module (123) can obtain location information from the GPS unit (122) to enable smooth transmission and reception of satellite signals even while moving.
[0050] The antenna control module (123) increases or decreases the frequency of the satellite signal being transmitted and received, thereby enabling smooth signal transmission and reception in the antenna module (121), or enabling overall control of the antenna device, such as satellite position control, transmission and reception settings, and communication network connection, and modules such as an electron beam phased array board, an antenna control board, a power distributor, a frequency converter, a multi-controller, and an ACU can be configured to be interconnected. Since the antenna control module (123) is generally the same as the configuration used in a satellite antenna device, a detailed description thereof will be omitted.
[0051] At this time, the lower surface of the installation panel (120) may be provided with a structure in which a protective cover (124) is further included so as to completely cover the antenna control module (123) to prevent damage to the antenna control module (123) and reduce signal loss, and a waterproof seal is formed around the lower surface of the installation panel (120) on which the protective cover (124) is installed to block moisture from entering the antenna control module (123).
[0052] In addition, the antenna unit (100) may further be provided with a fan module (140) that circulates the air in the internal space to prevent the performance of the heat-conducting pad and the heat-conducting tube from deteriorating or being overloaded due to the temperature of the air in the internal space of the antenna unit (100) rising due to heat generation resulting from the operation of the antenna module (121) and the antenna control module (123) so that the heat generated during the operation of the antenna module (121) and the antenna control module (123) can be discharged to the outside of the antenna unit (100).
[0053] At least one of the above fan modules (140) can be installed to enable effective air circulation, and it is preferable that the fan module (140) be provided on one side of the lower surface of the installation panel (120) so that the air in the internal space can be discharged in a downward direction.
[0054] At this time, it is preferable that a ventilation hole (131) be formed in the lower case (130) located at the lower portion of the installation panel (120) so as to face the fan module (140) and to allow the internal space to communicate with the outside, thereby allowing smooth air flow through the fan module (140).
[0055] In addition, the number of ventilation holes (131) is formed to be the same as the number of fan modules (140) to achieve 1:1 matching, thereby maximizing the air circulation efficiency of the internal space.
[0056] According to one embodiment of the present invention, the base part (200) may further include a casing home (220) into which the power supply module (210) is inserted and detachably coupled, as shown in FIG. 6, and a connector module (230) that is provided so as to be exposed on one side so that an external Ethernet and power line can be connected.
[0057] At this time, the power supply module (210) may include a mounting unit (211) having a space in which a plurality of battery modules (B) can be mounted so that they can be interconnected, a circuit board unit (213) that can be provided on one side of the mounting unit (211) and that enables smooth power supply to the battery modules (B), and a cover unit (212) that is coupled to the upper portion of the mounting unit (211).
[0058] At this time, it is preferable that the mounting unit (211) and the cover unit (212) be made of an insulator so that leakage or electric shock can be prevented.
[0059] In addition, the battery module (B) may be configured as a rechargeable lithium ion battery, and the connector module (230) connected to the circuit board unit (213) provided on one side of the mounting unit (211), more specifically, the connector module (230) connected to the port to which the external power line is provided, may be connected, so that a plurality of the battery modules (B) mounted on the base portion (200) can be charged via an external power source.
[0060] For example, the power line connected to the connector module (230) not only drives the antenna device through an external power source, but also charges a plurality of battery modules (B) mounted inside the base portion (200), thereby enabling the antenna device to be continuously operated even if the external power source is cut off.
[0061] In addition, a conductor wire may be formed at the lower portion of the base portion (200) to enable electrical connection with the connector module (230), the power supply module (210), and the antenna portion (100) as described above, and a sealing cover (240) and a molding cover (250) may be provided to prevent the conductor wire from being exposed to the outside and being damaged or broken.
[0062] According to one embodiment of the present invention, the rotation unit (300) may include a fixed shaft unit (310) that can be coupled and fixedly positioned on one side of the base unit (200), more specifically, at the center of one side, as shown in FIGS. 7 to 8b, a pair of connection shaft units (330) that can be coupled to each of the two ends of one side of the base unit (200), more specifically, the side to which the fixed shaft unit (310) is coupled, and a pair of rotation shaft units (320) that are respectively provided between the fixed shaft unit (310) and the connection shaft unit (330) so as to be capable of rotating around a central axis, and to which the antenna unit (100) is coupled on one side so as to rotate together with the antenna unit (100), thereby allowing the antenna unit (100) to swing relative to the rotation unit (300).
[0063] In addition, the rotating part (300) may be configured to have a structure in which a cap unit (340) is connected to each end to reinforce the binding force of the rotating part (300) and prevent foreign substances from entering the inside of the rotating part (300).
[0064] At this time, it should be recognized that the fixed shaft unit (310), the connecting shaft unit (330), and the rotating shaft unit (320) may be formed in a cylindrical shape and may be mutually coupled in the same longitudinal direction as one side of the base portion (200).
[0065] In addition, it should be noted that the same length direction as one side of the base portion (200) here means the same length direction as one side of the antenna portion (100) facing the base portion (200).
[0066] At this time, when the fixed shaft unit (310) is coupled to the base part (200), and the base part (200) is assumed to be inward with respect to the base part (200), the grip part (400) can be coupled to the outside of the fixed shaft unit (310), and a concave part formed inward is formed on the surface of the fixed shaft unit (310) that faces the grip part (400), so that the user can easily grip the grip part (400) and conveniently carry it while moving.
[0067] In addition, the connecting shaft unit (330) may have a range recognition section formed on one side of the outer surface, whereby the rotational range of the rotational shaft unit (320) is marked with a scale, which may be formed in a negative or positive manner. Correspondingly, the rotational shaft unit (320) may have an angle recognition section formed on one side of the outer surface, whereby the scale of the range recognition section is oriented, so that the rotational angle of the rotational shaft unit (320) can be recognized, which may be formed in a negative or positive manner.
[0068] For example, a graduation mark may be marked on one side of the outer circumference of the connecting shaft unit (330), and if it is assumed that each graduation mark is formed to correspond to 5 degrees, the state in which the antenna unit (100) is folded on the base unit (200) becomes 0 degrees, and as the antenna unit (100) is unfolded, each time the angle recognition unit formed on the rotation shaft unit (320) that rotates passes the graduation mark of the range recognition unit, it can be recognized that the rotation angle formed by the antenna unit (100) is made in units of 5 degrees, 10 degrees, and 15 degrees. Recognition of the exact angle according to such a notation can facilitate adjustment so that the antenna unit (100) faces a position with good satellite signal sensitivity when the antenna device is driven at the same location or nearby.
[0069] In this way, the antenna unit (100) and the base unit (200) that are respectively coupled to the rotating unit (300) may be provided with a shaft coupling unit (500) that allows easy coupling of the antenna unit (100) and the rotating shaft unit (320), and the base unit (200) and the connecting shaft unit (330) by means of a fastening member such as a screw. It is preferable that the inner surface of the shaft coupling unit (500) be curved to correspond to the outer surface of the rotating shaft unit (320) and the connecting shaft unit (330) so that stable coupling can be achieved.
[0070] As described above, preferred embodiments of the present invention have been described. It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms, in addition to the embodiments described above, without departing from the spirit or scope thereof. Therefore, the above-described embodiments should be considered illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description, but may be modified within the scope of the appended claims and their equivalents.
[0071] [Explanation of symbols]
[0072] 100: Antenna section
[0073] 110: Top cover
[0074] 120: Installation panel
[0075] 121: Antenna module
[0076] 122: GPS unit
[0077] 123: Antenna control module
[0078] 124: Protective cover
[0079] 130: Lower case
[0080] 131: Ventilation hole
[0081] 140: Fan module
[0082] 200: Bass section
[0083] 210: Power supply module
[0084] 211: Equipped Unit
[0085] 212: Cover unit
[0086] 213: Circuit board unit
[0087] 220: Casing Home
[0088] 230: Connector module
[0089] 240: Sealed cover
[0090] 250: Prosthetic cover
[0091] 300: Rotating part
[0092] 310: Fixed axis unit
[0093] 320: Rotation axis unit
[0094] 330: Connecting shaft unit
[0095] 340: Cap unit
[0096] 400: Phage Department
[0097] 500: Axial joint
[0098] B: Battery module
Claims
1. A plate-shaped antenna unit that transmits and receives satellite signals using a beam steering phased array method; A plate-shaped base part provided at the lower portion of the antenna part and capable of being connected to the antenna part, and having a power supply module that supplies power required to drive the antenna part; A rotating part in which one side of the antenna part and the base part facing each other are respectively coupled, and the antenna part rotates according to the satellite signal sensitivity to adjust the unfolding angle for smooth transmission and reception of satellite signals; and A gripping part provided on one side of the above rotating part to enable the user to grip it; Includes, A portable flip-type beam steering phased array antenna device in which the antenna part is swing-moved to unfold or fold about the rotation part as a reference axis while the base part is fixed on the floor or a stand, so that the unfolding angle for transmitting and receiving satellite signals from the antenna part can be adjusted.
2. In paragraph 1, The above antenna part, lower case; an upper cover coupled to the upper portion of the lower case; and An installation panel in which an antenna module having a flat plate shape and a chip-shaped antenna element is installed, which is provided in an internal space formed by combining the lower case and the upper cover; Includes, A portable flip-type beam steering phased array antenna device having a waterproof sealing along the perimeter of the joint between the lower case and the upper cover.
3. In paragraph 2, The above antenna module, A plurality of phased array chips are installed on the upper surface of the installation panel as a group, A thermal conductive pad that prevents the performance of the antenna module from being deteriorated by heat generated during operation; A portable flip-type beam steering phased array antenna device further comprising:
4. In paragraph 2, The above installation panel is, The antenna module and GPS unit are installed on the upper surface, An antenna control module is provided that can be linked to the antenna module and the GPS unit on the lower surface to secure location information from the antenna module and the GPS unit and control the satellite signal so that smooth transmission and reception of satellite signals can be achieved even while moving. On the bottom of the above installation panel, A protective cover provided to completely cover the antenna control module to prevent damage to the antenna control module and reduce signal loss; A portable flip-type beam steering phased array antenna device further comprising:
5. In paragraph 4, The above antenna part, At least one fan module provided on the lower surface of the above installation panel, which circulates the air in the internal space to allow heat generated between the operation of the antenna module and the antenna control module to be discharged to the outside of the antenna unit; A portable flip-type beam steering phased array antenna device further comprising:
6. In paragraph 5, The above lower case is, At least one ventilation hole formed to face the fan module and to allow the internal space to communicate with the outside; A portable flip-type beam steering phased array antenna device comprising:
7. In paragraph 1, The above base part, A casing home into which the power supply module is inserted but detachably coupled; and A connector module that is equipped to be exposed on one side to allow external Ethernet and power lines to be connected; A portable flip-type beam steering phased array antenna device further comprising:
8. In paragraph 7, The above power supply module, A mounting unit having a space in which multiple battery modules are mounted so as to be interconnected; A circuit board unit provided on one side of the above mounting unit to ensure smooth power supply to the battery module; and A cover unit coupled to the upper part of the above mounting unit; A portable flip-type beam steering phased array antenna device comprising:
9. In paragraph 1, The above rotating part, A fixed axis unit fixedly coupled to the center of one side of the above base portion; A pair of connecting shaft units coupled to both ends of one side of the above base portion; and A pair of rotary shaft units each provided between the fixed shaft unit and the connecting shaft unit to enable rotation around a central axis, and the antenna unit is coupled to one side thereof so that the antenna unit swings relative to the rotary unit; Includes, The above fixed shaft unit, connecting shaft unit and rotating shaft unit have a cylindrical shape and are mutually connected in the same length direction as one side of the base portion, and are a portable flip-type beam steering phased array antenna device.
10. In paragraph 9, The above fixed axis unit, A portable flip-type beam steering phased array antenna device characterized in that the grip part is coupled to the outside of the base part and the surface facing the grip part forms a concave part formed inward so that the user can easily grip the grip part.
11. In paragraph 9, The above connecting shaft unit is, A range recognition unit formed on one side of the outer surface and having a range of rotation of the rotation shaft unit marked with a scale; A portable flip-type beam steering phased array antenna device comprising:
12. In paragraph 11, The above rotary shaft unit, An angle recognition unit formed on one side of the outer circumference and directed toward the scale of the range recognition unit to recognize the rotation angle of the rotation shaft unit, thereby enabling detailed angle adjustment of the antenna unit; A portable flip-type beam steering phased array antenna device comprising:
13. In paragraph 9, The above antenna part and the above base part, A pair of shaft coupling parts each coupled to the above rotary shaft unit and the above connecting shaft unit; A portable flip-type beam steering phased array antenna device further comprising:
Citation Information
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