Antenna device

Abstract

To provide an antenna device capable of smoothly operating a tilt drive unit that tilts an antenna unit by reducing the weight of the tilt drive unit while ensuring sufficient rigidity. [Solution] The antenna device includes an antenna unit, a plurality of tilt members that tilt the antenna unit when rotated, and a plurality of joint bars that rotatably connect both ends of each of the plurality of tilt members, and a tilt drive unit that connects the antenna unit to a support, and the plurality of joint bars are formed in the shape of a hollow pipe inside.

Description

[Technical Field]

[0001] The present invention relates to an antenna apparatus, and more particularly to a multiple input / output antenna apparatus used in wireless communication technology such as a mobile communication terminal. [Background technology]

[0002] Wireless communication technology, such as MIMO (Multiple Input Multiple Output) technology, is a technology that dramatically increases data transmission capacity by using multiple antennas. It is a spatial multiplexing technique in which the transmitter transmits different data through each transmitting antenna, and the receiver separates the transmitted data through appropriate signal processing.

[0003] Therefore, by simultaneously increasing the number of transmitting and receiving antenna units, the channel capacity increases, allowing for more data to be transmitted. For example, increasing the number of antennas to 10 will secure approximately 10 times the channel capacity compared to the current single antenna system using the same frequency band.

[0004] 4G LTE-advanced uses up to eight antennas, and in the pre-5G stage, products equipped with 64 or 128 antennas have been developed. As wireless communication technology advances, base station equipment with far more antennas is expected to be used, which is called Massive MIMO technology. Massive MIMO technology is also called FD-MIMO (Full Dimension) because it enables 3D-Beamforming compared to the conventional 2-Dimensional Cell operation method.

[0005] In Massive MIMO technology, as the number of antennas increases, the number of transmitters and filters also increases. However, when installing a MIMO antenna, which combines RF components (antenna / filter / power amplifier / transceiver, etc.) and digital components in a stacked structure, in a limited space due to lease costs and spatial constraints, there is an increasing need for a compact and miniaturized design for the multiple layers that make up the MIMO antenna to maximize ease of installation and space utilization.

[0006] In addition, the strength of communication with mobile communication terminals can change depending on the direction of the antenna, and base station antennas need to be tilted (adjusted vertical angle) or rotated (adjusted horizontal angle) to eliminate shadow areas and adjust the direction of the antenna, thereby changing the direction of the signals sent and received from the antenna.

[0007] As a technology for adjusting the direction of the antenna, U.S. Patent Publication US10511090 B2 (December 17, 2019) (hereinafter referred to as the "prior art") discloses a "wireless telecommunication antenna mount and control system."

[0008] The prior art is an antenna mount for use with a communications antenna having at least one AISG antenna control unit (ACU), the antenna mount including: a structure interface attached to an installation structure; an antenna interface attached to the antenna and rotatably connected to the structure interface through a pivot having a vertical axis, the antenna interface being rotatably movable about the vertical axis through a range of azimuth positions; and a mount azimuth control unit (MACU) having a motor, an AISG-compatible motor controller, a male bidirectional AISG port, and a female bidirectional AISG port mechanically connected to each other between the structure interface and the antenna interface, the motor being capable of controlling the motor to drive the rotatable movement of the antenna through the range of azimuth positions, the ACU and MACU being connected to each other in series via the bidirectional AISG port to an AISG control interface for direct remote control of both the ACU and MACU. The mount further comprises a mechanical downtilt assembly mechanically coupled between the antenna interface and the antenna, the mechanical downtilt assembly comprising a lower hinge connector coupled between a lower portion of the antenna interface and a lower portion of the antenna, the lower hinge connector being rotatable about a horizontal axis, and the mechanical downtilt assembly further comprises an upper downtilt bracket coupled between an upper portion of the antenna interface and an upper portion of the antenna, the upper downtilt bracket being configured to pivot the antenna relative to the lower hinge connector through a tilt angle position range.

[0009] However, the conventional mechanical downtilt assembly is configured with a plurality of scissor arms rotatably connected via a plurality of pivots, but the weight of the plurality of scissor arms and the plurality of pivots makes the tilt operation less smooth. However, if the weight of the plurality of scissor arms and the plurality of pivots is reduced excessively, there is a possibility that the assembly may not be able to secure sufficient rigidity to support the antenna. Summary of the Invention technical challenges

[0010] A technical object of the present invention is to provide an antenna device that can reduce the weight of a tilt drive unit that tilts an antenna unit while ensuring sufficient rigidity, thereby enabling smooth operation of the tilt drive unit.

[0011] Another technical object of the present invention is to provide an antenna device in which the antenna unit can be tilted manually or automatically.

[0012] The technical problems to be solved by the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

[0013] To achieve the above object, an antenna device according to the present invention comprises an antenna unit and a tilt drive unit. The tilt drive unit connects the antenna unit to a support. The tilt drive unit has a plurality of tilt members and a plurality of joint bars. The plurality of tilt members tilt the antenna unit when rotated. The plurality of joint bars rotatably connect both ends of each of the plurality of tilt members. The plurality of joint bars are formed in the shape of a hollow pipe.

[0014] At least one bushing may be connected to each of both ends of the tilt members, and each of the joint bars may be rotatably connected to the at least one bushing.

[0015] The plurality of tilt members may be formed in the shape of a hollow pipe.

[0016] Both ends of the plurality of joint bars may be respectively coupled to the plurality of tilt members by a plurality of fastening members.

[0017] Clip through holes may be formed at both ends of the plurality of joint bars. The plurality of fixing fastening members may be formed of a plurality of clips. The plurality of clips may pass through the clip through holes formed at both ends of the plurality of joint bars, respectively. The plurality of clips may connect the plurality of joint bars to the plurality of tilt members, respectively.

[0018] Snap ring grooves may be formed on outer peripheral surfaces of both ends of the plurality of joint bars. The plurality of fixing fastening members may be formed of a plurality of snap rings. The plurality of snap rings may be respectively coupled to the snap ring grooves formed on outer peripheral surfaces of both ends of the plurality of joint bars. The plurality of snap rings may respectively couple the plurality of joint bars to the plurality of tilt members.

[0019] The plurality of joint bars may include a first joint bar, a second joint bar, a third joint bar, and a fourth joint bar. The second joint bar may be spaced forward from the first joint bar. The second joint bar may be arranged parallel to the first joint bar. The third joint bar may be spaced upward or downward between the first joint bar and the second joint bar. The third joint bar may be arranged parallel to the first joint bar and the second joint bar. The fourth joint bar may be spaced in the opposite direction to the third joint bar between the first joint bar and the second joint bar. The fourth joint bar may be arranged parallel to the first joint bar, the second joint bar, and the third joint bar.

[0020] A pole mounting unit may be coupled to the pole. An antenna mounting unit may be coupled to the antenna unit. The first joint bar may be coupled to the pole mounting unit. The second joint bar may be coupled to the antenna mounting unit.

[0021] The plurality of tilt members may include a first tilt member, a second tilt member, a third tilt member, and a fourth tilt member. Both ends of the first tilt member may be rotatably coupled to the first joint bar and the third joint bar, respectively. Both ends of the second tilt member may be rotatably coupled to the second joint bar and the third joint bar, respectively. Both ends of the third tilt member may be rotatably coupled to the first joint bar and the fourth joint bar, respectively. Both ends of the fourth tilt member may be rotatably coupled to the second joint bar and the fourth joint bar, respectively.

[0022] The first tilt member may be comprised of a 1-1 tilt member and a 1-2 tilt member. Both ends of the 1-1 tilt member may be rotatably coupled to one end of the first joint bar and one end of the third joint bar, respectively. Both ends of the 1-2 tilt member may be rotatably coupled to the other end of the first joint bar and the other end of the third joint bar, respectively. The second tilt member may be comprised of a 2-1 tilt member and a 2-2 tilt member. Both ends of the 2-1 tilt member may be rotatably coupled to one end of the second joint bar and one end of the third joint bar, respectively. Both ends of the 2-2 tilt member may be rotatably coupled to the other end of the second joint bar and the other end of the third joint bar, respectively. The third tilt member may be comprised of a 3-1 tilt member and a 3-2 tilt member. Both ends of the 3-1 tilt member may be rotatably coupled to one end of the first joint bar and one end of the fourth joint bar, respectively. Both ends of the 3-2 tilt member may be rotatably coupled to the other end of the first joint bar and the other end of the fourth joint bar, respectively. The fourth tilt member may be composed of a 4-1 tilt member and a 4-2 tilt member. Both ends of the 4-1 tilt member may be rotatably coupled to one end of the second joint bar and one end of the fourth joint bar, respectively. Both ends of the 4-2 tilt member may be rotatably coupled to the other end of the second joint bar and the other end of the fourth joint bar, respectively.

[0023] The tilt drive unit may further include a nut member and a screw bar. The nut member may be disposed on one of the third joint bar and the fourth joint bar. The screw bar may be fastened perpendicularly to the nut member. When the screw bar is rotated, it can rotate the first tilt member, the second tilt member, the third tilt member, and the fourth tilt member to tilt the antenna unit.

[0024] A hollow pipe-shaped first coupling frame may be disposed on the nut member. A first through-hole through which one of the first coupling frames passes may be formed on both sides of the first coupling frame. A second through-hole through which the screw bar passes may be formed on the top and bottom of the first coupling frame. A third through-hole through which the screw bar passes may be formed in one of the first coupling frames.

[0025] The tilt drive unit may further include a mounting bracket and a manual tilt adjustment member. The mounting bracket may be disposed on one of the third joint bar and the fourth joint bar. The manual tilt adjustment member may be rotatably disposed on the mounting bracket. The manual tilt adjustment member may be coupled to one end of the screw bar.

[0026] A second coupling frame having a hollow pipe shape may be disposed on the mounting bracket. A fourth through-hole through which the other one of the coupling frames passes may be formed on both sides of the second coupling frame. A fifth through-hole through which the screw bar passes may be formed on a lower side of the second coupling frame. A sixth through-hole through which the manual tilt adjustment member passes may be formed on an upper side of the second coupling frame. A seventh through-hole through which the coupling portion of the screw bar and the manual tilt adjustment member passes may be formed on the other one of the coupling frames.

[0027] The tilt drive unit may further include a tilt motor mounted on the mounting bracket, and a rotation shaft of the tilt motor may be connected to the manual tilt adjustment member to rotate the screw bar.

[0028] The plurality of tilt members may be formed in a plate shape.

[0029] A plurality of bolts may be fastened to both ends of the plurality of joint bars, respectively, and the plurality of bolts may connect the plurality of joint bars to the plurality of tilt members, respectively.

[0030] The plurality of joint bars may include a first joint bar, a second joint bar, and a third joint bar. The second joint bar may be spaced forward from the first joint bar. The second joint bar may be disposed parallel to the first joint bar. The third joint bar may be spaced upward or downward between the first joint bar and the second joint bar. The third joint bar may be disposed parallel to the first joint bar and the second joint bar.

[0031] A pole mounting unit may be coupled to the pole. An antenna mounting unit may be coupled to the antenna unit. The first joint bar may be coupled to the pole mounting unit. The second joint bar may be coupled to the antenna mounting unit.

[0032] The plurality of tilt members may include a first tilt member and a second tilt member. Both ends of the first tilt member may be rotatably coupled to the first joint bar and the third joint bar, respectively. Both ends of the second tilt member may be rotatably coupled to the second joint bar and the third joint bar, respectively.

[0033] The first tilt member may be comprised of a 1-1 tilt member and a 1-2 tilt member. Both ends of the 1-1 tilt member may be rotatably coupled to one end of the first joint bar and one end of the third joint bar, respectively. Both ends of the 1-2 tilt member may be rotatably coupled to the other end of the first joint bar and the other end of the third joint bar, respectively. The second tilt member may be comprised of a 2-1 tilt member and a 2-2 tilt member. Both ends of the 2-1 tilt member may be rotatably coupled to one end of the second joint bar and one end of the third joint bar, respectively. Both ends of the 2-2 tilt member may be rotatably coupled to the other end of the second joint bar and the other end of the third joint bar, respectively.

[0034] The tilt driving unit may further include a first connecting plate and a second connecting plate. The 1-1 tilt member and the 1-2 tilt member may be formed by bending the first connecting plate. The 2-1 tilt member and the 2-2 tilt member may be formed by bending the second connecting plate.

[0035] The tilt drive unit may further include a nut member and a screw bar. The nut member may be disposed on the third joint bar. The screw bar may be fastened perpendicularly to the nut member. When the screw bar is rotated, it can rotate the first tilt member and the second tilt member to tilt the antenna unit.

[0036] The tilt drive unit may further include a mounting bracket and a manual tilt adjustment member. A first guide hole may be formed on a side of the mounting bracket to guide the third joint bar up and down when the screw bar rotates. The manual tilt adjustment member may be rotatably disposed on an upper surface of the mounting bracket. The manual tilt adjustment member may be coupled to one end of the screw bar.

[0037] The first tilt member and the second tilt member may have second guide holes formed therein. A guide protrusion may be formed on the side surface of the mounting bracket. The guide protrusion may guide the rotation of the first tilt member and the second tilt member by moving along the second guide hole when the third joint bar moves up and down along the first guide hole.

[0038] The tilt drive unit may further include a tilt motor mounted on the upper surface of the mounting bracket, and a rotation shaft of the tilt motor may be connected to the manual tilt adjustment member to rotate the screw bar.

[0039] The plurality of tilt members may be formed in a block shape.

[0040] The plurality of joint bars may include a first joint bar, a second joint bar, a third joint bar, and a fourth joint bar. The second joint bar may be spaced forward from the first joint bar. The second joint bar may be disposed parallel to the first joint bar. The third joint bar may be spaced upward or downward between the first joint bar and the second joint bar. The third joint bar may be disposed parallel to the first joint bar and the second joint bar. The fourth joint bar may be spaced in the opposite direction to the third joint bar between the first joint bar and the second joint bar. The fourth joint bar may be disposed parallel to the first joint bar, the second joint bar, and the third joint bar.

[0041] The plurality of tilt members may include a first tilt member, a second tilt member, a third tilt member, and a fourth tilt member. Both ends of the first tilt member may be rotatably coupled to the first joint bar and the third joint bar, respectively. Both ends of the second tilt member may be rotatably coupled to the second joint bar and the third joint bar, respectively. Both ends of the third tilt member may be rotatably coupled to the first joint bar and the fourth joint bar, respectively. Both ends of the fourth tilt member may be rotatably coupled to the second joint bar and the fourth joint bar, respectively.

[0042] A first coupling block to be coupled to the support may be protruded from a rear surface of the first tilt member, and a second coupling block to be coupled to a rear surface of the antenna unit may be protruded from a front surface of the second tilt member.

[0043] The first tilt member, the second tilt member, the third tilt member, and the fourth tilt member may have the same length between their ends.

[0044] The lengths between both ends of the first tilt member and the second tilt member may be the same first length. The lengths between both ends of the third tilt member and the fourth tilt member may be the same second length. The first length and the second length may be different from each other.

[0045] The first tilt member may have a first rotary coupling portion and a second rotary coupling portion protruding therefrom. Both ends of the first rotary coupling portion may be rotatably coupled to one end of the first joint bar and one end of the third joint bar, respectively. Both ends of the second rotary coupling portion may be rotatably coupled to the other end of the first joint bar and the other end of the third joint bar, respectively. The second tilt member may have a third rotary coupling portion and a fourth rotary coupling portion protruding therefrom. Both ends of the third rotary coupling portion may be rotatably coupled to one end of the second joint bar and one end of the third joint bar, respectively. Both ends of the fourth rotary coupling portion may be rotatably coupled to the other end of the second joint bar and the other end of the third joint bar, respectively. The third tilt member may have a fifth rotary coupling portion and a sixth rotary coupling portion protruding therefrom. Both ends of the fifth rotary coupling portion may be rotatably coupled to one end of the first joint bar and one end of the fourth joint bar, respectively. Both ends of the sixth swivel coupling may be rotatably coupled to the other end of the first joint bar and the other end of the fourth joint bar, respectively. A seventh swivel coupling and an eighth swivel coupling may be protruded from the fourth tilt member. Both ends of the seventh swivel coupling may be rotatably coupled to one end of the second joint bar and one end of the fourth joint bar, respectively. Both ends of the eighth swivel coupling may be rotatably coupled to the other end of the second joint bar and the other end of the fourth joint bar, respectively.

[0046] The tilt drive unit may further include a nut member and a screw bar. The nut member may be disposed on one of the third joint bar and the fourth joint bar. The screw bar may be fastened perpendicularly to the nut member. When the screw bar is rotated, it can rotate the first tilt member, the second tilt member, the third tilt member, and the fourth tilt member to tilt the antenna unit.

[0047] The one of the screws may penetrate the nut member laterally, and the screw bar may penetrate the nut member and the one of the screws vertically.

[0048] The tilt driving unit may further include a tilt motor. The tilt motor may rotate the screw bar. The other of the third joint bar and the fourth joint bar may pass through the tilt motor laterally.

[0049] A pole mounting unit may be coupled to the pole. An antenna mounting unit may be coupled to the antenna unit. A rear surface of the third tilt member may be coupled to the pole mounting unit. A front surface of the fourth tilt member may be coupled to the antenna mounting unit.

[0050] One side of the at least one bushing may be cut to form a cutout, and at least a portion of a portion of the at least one bushing opposite the cutout may be welded to each of the plurality of tilt members in an arc shape.

[0051] The antenna mounting unit may have a connecting portion and a reinforcing plate. The connecting portion may be connected to the second joint bar. The connecting portion may be formed in a hollow pipe shape. The reinforcing plate may be formed in a triangular plate shape that is welded to the connecting portion.

[0052] The rear surface of the 1-1 tilt member and the rear surface of the 1-2 tilt member may be connected by a first connection bar. The front surface of the 2-1 tilt member and the front surface of the 2-2 tilt member may be connected by a second connection bar. The rear surface of the 3-1 tilt member and the rear surface of the 3-2 tilt member may be connected by a third connection bar. The front surface of the 4-1 tilt member and the front surface of the 4-2 tilt member may be connected by a fourth connection bar.

[0053] Further details of the embodiments are included in the detailed description and drawings. [Effects of the Invention]

[0054] In the antenna device according to the present invention, the plurality of joint bars constituting the tilt drive unit that tilts the antenna unit are formed in a hollow pipe shape, thereby reducing the weight of the tilt drive unit while ensuring sufficient rigidity, thereby achieving smooth operation of the tilt drive unit.

[0055] In addition, the antenna device according to the present invention has the advantage that an operator can manually tilt the antenna unit by rotating the manual tilt adjustment member, and that the antenna unit can be automatically tilted by operating the tilt motor by connecting the rotation shaft of the tilt motor to the manual tilt adjustment member.

[0056] In addition, in the antenna device according to the present invention, at least one bushing is connected to each end of each of the plurality of tilt members, and each of the plurality of joint bars is rotatably connected to the at least one bushing, thereby enabling smooth operation of the tilt drive unit and reducing operating noise.

[0057] In addition, in the antenna device according to the present invention, one side of the at least one bushing is cut to form a cutout, and at least a portion of the opposite side of the cutout of the at least one bushing is welded to each of the plurality of tilt members in an arc shape, so that when the plurality of tilt members rotate, the at least one bushing expands based on the cutout, which has the effect of facilitating smooth rotation of the plurality of tilt members.

[0058] In addition, in the antenna device according to the present invention, when the vertical length of the antenna unit is relatively long, the antenna unit can be installed on the support pole through the lower link unit and the tilt drive unit, and when the vertical length of the antenna unit is relatively short, the antenna unit can be installed on the support pole through only the tilt drive unit, thereby providing the effect of allowing the antenna unit to be firmly coupled to the support pole against external forces such as wind.

[0059] In addition, the antenna device according to the present invention has the advantage that the tilt drive unit can be directly installed on the pole and the antenna unit, respectively, without the need for a conventional pole mounting unit installed on the pole and a conventional antenna mounting unit installed on the antenna unit, thereby enabling the antenna unit to be tilted with a simple structure.

[0060] The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims. [Brief explanation of the drawings]

[0061] [Figure 1] 1 is a side view showing an antenna device according to a first embodiment of the present invention. [Figure 2] 2 is a diagram showing a state in which the tilt drive unit shown in FIG. 1 tilts the antenna unit. FIG. [Figure 3] FIG. 2 is an enlarged view of the tilt drive unit shown in FIG. 1. [Figure 4] FIG. 4 is a front perspective view of FIG. 3. [Figure 5] FIG. 4 is a rear perspective view of FIG. 3. [Figure 6] FIG. 5 is an exploded perspective view showing the fourth joint bar and the 3-1 tilt member shown in FIG. 4. [Figure 7] FIG. 7 is a cross-sectional view of the coupled state of FIG. 6. [Figure 8] FIG. 6 is a perspective view showing a nut member, a screw bar, and a tilt motor shown in FIGS. 4 and 5. [Figure 9] FIG. 9 is a bottom perspective view of FIG. 8. [Figure 10] FIG. 10 is an exploded perspective view showing the upper part of FIGS. 8 and 9. [Figure 11] FIG. 11 is a bottom perspective view of FIG. [Figure 12] FIG. 10 is an exploded perspective view showing the lower part of FIGS. 8 and 9. [Figure 13] FIG. 13 is a bottom perspective view of FIG. 12. [Figure 14] 5A and 5B are diagrams showing other embodiments of the antenna mounting unit and the mast mounting unit shown in FIG. 4. [Figure 15] 15 is a diagram showing a state in which a reinforcing plate is added to the antenna mounting unit shown in FIG. 14. FIG. [Figure 16] FIG. 2 is a rear perspective view showing the lower link unit shown in FIG. 1. [Figure 17] FIG. 10 is a side view showing an antenna device according to a second embodiment of the present invention. [Figure 18] FIG. 18 is an enlarged view of the lower link unit and tilt drive unit shown in FIG. 17. [Figure 19] FIG. 19 is a front perspective view of FIG. 18. [Figure 20] FIG. 19 is a rear perspective view of FIG. 18. [Figure 21] FIG. 19 is a cross-sectional view of the tilt drive unit shown in FIG. 18. [Figure 22] FIG. 22 is a diagram showing the tilt operation degree of FIG. 21. [Figure 23] FIG. 22 is a diagram showing FIG. 21 excluding the tilt motor. [Figure 24] FIG. 18 is a perspective view showing the tilt drive unit shown in FIG. 17. [Figure 25] FIG. 25 is a rear bottom perspective view of FIG. 24. [Figure 26] FIG. 26 is a diagram showing the internal structure of FIGS. 24 and 25. [Figure 27] FIG. 27 is a bottom perspective view of FIG. 26. [Figure 28] FIG. 10 is a side view showing an antenna device according to a third embodiment of the present invention. [Figure 29] FIG. 29 is a diagram showing a state in which the tilt drive unit shown in FIG. 28 tilts the antenna unit. [Figure 30] FIG. 29 is an enlarged view of the tilt drive unit shown in FIG. 28. [Figure 31] FIG. 31 is a front perspective view of FIG. 30. [Figure 32] FIG. 31 is a rear bottom perspective view of FIG. 30. [Figure 33] FIG. 10 is a diagram showing a state in which the tilt drive unit of the antenna apparatus according to the fourth embodiment of the present invention tilts the antenna unit. [Figure 34] FIG. 10 is a diagram showing a state in which the tilt drive unit of the antenna apparatus according to the fifth embodiment of the present invention tilts the antenna unit. [Figure 35] FIG. 10 is a diagram showing an antenna device according to a sixth embodiment of the present invention. [Figure 36] 36 is a diagram showing a state in which the tilt drive unit shown in FIG. 35 tilts the antenna unit so that the front surface of the antenna unit faces downward. FIG. [Figure 37] 36 is a diagram showing a state in which the tilt drive unit shown in FIG. 35 tilts the antenna unit so that the front surface of the antenna unit faces upward. FIG. [Figure 38] FIG. 36 is an enlarged view of the tilt drive unit shown in FIG. 35. [Figure 39] FIG. 39 is a front perspective view of FIG. 38. [Figure 40] FIG. 39 is a rear bottom perspective view of FIG. 38. [Figure 41] FIG. 7 is a perspective view showing another embodiment of the bush shown in FIG. 6. [Figure 42] FIG. 42 is a side view of FIG. 41. [Figure 43] FIG. 37 is a diagram showing another embodiment of the tilt drive unit shown in FIG. 36. [Figure 44] FIG. 44 is an exploded view of the fourth snap ring in the fourth joint bar shown in FIG. 43. [Figure 45] FIG. 13 is a side view showing an antenna apparatus according to a seventh embodiment of the present invention. [Figure 46]FIG. 46 is a front perspective view showing the tilt drive unit shown in FIG. 45. [Figure 47] FIG. 46 is a rear perspective view showing the tilt drive unit shown in FIG. 45. [Figure 48] FIG. 46 is a rear perspective view of the lower link unit shown in FIG. 45. Best Mode for Carrying Out the Invention

[0062] Hereinafter, antenna devices according to embodiments of the present invention will be described with reference to the drawings. Components that perform the same function in each embodiment will be described using the same names and reference numerals. In the following description, terms related to the same direction as front, back, up, down, left, and right refer to the same directions as front, back, up, down, left, and right in FIG. 1 and FIG. 4.

[0063] In the following description, 'tilt' can mean 'rotation in the up and down direction based on a horizontally positioned rotation center' and can also mean adjustment of the up and down angle.

[0064] FIG. 1 is a side view showing an antenna device according to a first embodiment of the present invention, and FIG. 2 is a view showing a state in which the tilt driving unit shown in FIG. 1 tilts the antenna unit.

[0065] Referring to Figures 1 and 2, an antenna device (1) according to a first embodiment of the present invention includes a support pole (100), an antenna unit (200), a lower link unit (300) and a tilt drive unit (400).

[0066] However, if the vertical length of the antenna unit 200 is shorter than that of the first embodiment, the lower link unit 300 may not be provided.

[0067] In other words, when the antenna unit (200) is formed with a relatively long vertical length, a lower link unit (300) and a tilt drive unit (400) are provided, and the tilt drive unit (400) connects the upper part of the antenna unit (200) to the support (100), and the lower link unit (300) connects the lower part of the antenna unit (200) to the support (100), thereby enabling the antenna unit (200) to be firmly connected to the support (100) against external forces such as wind.

[0068] If the vertical length of the antenna unit (200) is relatively short, the lower link unit (300) is not provided, and only the tilt drive unit (400) is provided, and the tilt drive unit (400) can connect the antenna unit (200) to the support (100).

[0069] The support 100 may be formed in a vertically long bar shape. The support 100 may be formed in a bar shape with a circular cross section. The support 100 can support the components of the antenna device according to the embodiment of the present invention except for itself.

[0070] The antenna unit 200 may be formed in a roughly rectangular cylindrical shape. A substrate on which an antenna element is mounted may be installed inside the antenna unit 200.

[0071] The lower link unit (300) can connect the lower part of the antenna unit (200) to the support (100) so that the antenna unit (200) can rotate up and down. The lower link unit (300) is disposed below the tilt drive unit (400) and can connect the antenna unit (200) to the support (100) so that the antenna unit (200) can rotate up and down.

[0072] The lower link unit (300) may include a first bracket connected to the support (100) and disposed in front of the support (100), a second bracket connected to the rear surface of the antenna unit (200) and disposed behind the antenna unit (200), and a rotating shaft that is elongated horizontally from side to side and rotatably connects the first bracket and the second bracket.

[0073] The tilt drive unit (400) can connect the antenna unit (200) to the support (100). The tilt drive unit (400) can tilt the antenna unit (200). The tilt drive unit (400) can connect the upper part of the antenna unit (200) to the support (100). The tilt drive unit (400) can rotate and tilt the upper part of the antenna unit (200) around the rotation center of the lower link unit (300).

[0074] The support (100) may be disposed rearwardly and spaced apart from the antenna unit (200). The antenna unit (200) may be disposed forwardly and spaced apart from the support (100). The lower link unit (300) may be disposed below and spaced apart from the tilt drive unit (400). The lower link unit (300) may connect between the support (100) and the antenna unit (200). The tilt drive unit (400) may be disposed above and spaced apart from the lower link unit (300). The tilt drive unit (400) may connect between the support (100) and the antenna unit (200).

[0075] The specific structure of the tilt drive unit (400) of the first embodiment will be explained in detail below.

[0076] 3 is an enlarged view of the tilt drive unit shown in FIG. 1, FIG. 4 is a front perspective view of FIG. 3, and FIG. 5 is a rear perspective view of FIG.

[0077] Referring to Figures 3 to 5, the tilt drive unit (400) may include a plurality of joint bars (411, 412, 413, 414), a plurality of tilt members (421, 422, 423, 424) each rotatably connected at both ends to the plurality of joint bars (411, 412, 413, 414), a nut member (430), a screw bar (440), and a tilt motor (450).

[0078] The plurality of joint bars (411, 412, 413, 414) can rotatably connect both ends of each of the plurality of tilt members (421, 422, 423, 424). The plurality of joint bars (411, 412, 413, 414) may include a first joint bar (411), a second joint bar (412) spaced forward from the first joint bar (411) and disposed parallel to the first joint bar (411), a third joint bar (413) spaced downward between the first joint bar (411) and the second joint bar (412) and disposed parallel to the first joint bar (411) and the second joint bar (412), and a fourth joint bar (414) spaced upward in the opposite direction to the third joint bar (413) between the first joint bar (411) and the second joint bar (412) and disposed parallel to the first joint bar (411), the second joint bar (412), and the third joint bar (413).

[0079] The plurality of tilt members (421, 422, 423, 424) can tilt the antenna unit (200) when rotated. The plurality of tilt members (421, 422, 423, 424) can include a first tilt member (421) having both ends rotatably coupled to the first joint bar (411) and the third joint bar (413), respectively, a second tilt member (422) having both ends rotatably coupled to the second joint bar (412) and the third joint bar (413), respectively, a third tilt member (423) having both ends rotatably coupled to the first joint bar (411) and the fourth joint bar (414), respectively, and a fourth tilt member (424) having both ends rotatably coupled to the second joint bar (412) and the fourth joint bar (414).

[0080] The nut member 430 may be disposed on the third joint bar 413. However, the nut member 430 may also be disposed on the fourth joint bar 414. That is, the nut member 430 may be disposed on either the third joint bar 413 or the fourth joint bar 414, and the mounting bracket 460 (described below) may be disposed on the other of the third joint bar 413 or the fourth joint bar 414.

[0081] The screw bar 440 may be formed long in the vertical direction. The screw bar 440 is fastened vertically to the nut member 430, and when rotated, rotates the first tilt member 421, the second tilt member 422, the third tilt member 423, and the fourth tilt member 424, thereby tilting the antenna unit 200. The tilt motor 450 may be a driving source for rotating the screw bar 440.

[0082] The nut member (430) may have a thread formed on its inner peripheral surface, and the screw bar (440) may have a thread formed on its outer peripheral surface that is fastened to the thread formed on the inner peripheral surface of the nut member (430) in a screw manner.

[0083] The threads formed on the inner peripheral surface of the nut member (430) and the threads formed on the outer peripheral surface of the screw bar (440) may be formed as 30-degree trapezoidal threads.

[0084] The advantages of using a 30-degree trapezoidal thread on the inner surface of the nut member (430) and the outer surface of the screw bar (440) are as follows: First, as a moving element, there is no one-sided load in the thrust direction, providing excellent steering ability under high load conditions. It also reduces the load transmitted to the tilt motor (450), preventing overload on the tilt motor (450). Second, it has superior strength compared to similarly sized general invaluable gear teeth. Third, it has good engagement and power transmission, allowing for self-locking. Fourth, it allows both automatic operation with the tilt motor (450) and manual operation without the tilt motor (450). Fifth, it eliminates the need for an aluminum structure.

[0085] Meanwhile, an antenna mounting unit 600 may be coupled to the rear surface of the antenna unit 200. The antenna mounting unit 600 may be coupled to the upper part of the antenna unit 200. A second joint bar 412 may be coupled to the antenna mounting unit 600.

[0086] The antenna mounting unit 600 may have a hollow rectangular pipe-shaped coupling part 615 formed to protrude rearward toward the support 100. The coupling part 615 may be coupled to the second joint bar 412 of the tilt drive unit 400. The coupling part 615 may be formed as a pair of coupling parts 615 spaced apart in the left-right direction, and the pair of coupling parts 615 may be coupled to both ends of the second joint bar 412, respectively.

[0087] The antenna mounting unit 600 may include a horizontal bracket 610 extending horizontally and a pair of vertical brackets 620 and 630 extending vertically and coupled to both ends of the horizontal bracket 610, respectively.

[0088] A pair of coupling portions (615) may be formed on the rear surface of the horizontal bracket (610) to protrude rearward, and a pair of vertical brackets (620, 630) may be fastened to the rear surface of the antenna unit (200) by bolts or screws.

[0089] A pole mounting unit 700 may be coupled to the top of the pole 100. A first joint bar 411 may be coupled to the pole mounting unit 700. The pole mounting unit 700 may be coupled to the first joint bar 411 of the tilt drive unit 400.

[0090] The first tilt member 421 and the third tilt member 423 are rotatably coupled to the first joint bar 411, and after the support mounting units 700 are coupled to both ends of the first joint bar 411, first clips C1 may be installed on both ends of the first joint bar 411. The first clips C1 can prevent the first joint bar 411 from separating from the first tilt member 421 and the third tilt member 423.

[0091] The second tilt member 422 and the fourth tilt member 424 are rotatably coupled to the second joint bar 412, and after the coupling portions 615 of the antenna mounting unit 600 are coupled to both ends of the second joint bar 412, second clips C2 may be installed on both ends of the second joint bar 412. The second clips C2 can prevent the second joint bar 412 from separating from the second tilt member 422 and the fourth tilt member 424.

[0092] After the first tilt member 421 and the second tilt member 422 are rotatably coupled to the third joint bar 413, a third clip C3 may be installed on each end of the third joint bar 413. The third clip C3 can prevent the third joint bar 413 from separating from the first tilt member 421 and the second tilt member 422.

[0093] After the third tilt member 423 and the fourth tilt member 424 are rotatably coupled to the fourth joint bar 414, a fourth clip C4 may be installed on each end of the fourth joint bar 414. The fourth clip C4 can prevent the fourth joint bar 414 from separating from the third tilt member 423 and the fourth tilt member 424.

[0094] The first tilt member (421) may include a 1-1 tilt member (421A) whose both ends are rotatably connected to one end of the first joint bar (411) and one end of the third joint bar (413), respectively, and a 1-2 tilt member (421B) whose both ends are rotatably connected to the other end of the first joint bar (411) and the other end of the third joint bar (413), respectively.

[0095] The second tilt member (422) may include a 2-1 tilt member (422A) whose both ends are rotatably connected to one end of the second joint bar (412) and one end of the third joint bar (413), respectively, and a 2-2 tilt member (422B) whose both ends are rotatably connected to the other end of the second joint bar (412) and the other end of the third joint bar (413), respectively.

[0096] The third tilt member (423) may include a 3-1 tilt member (423A) whose both ends are rotatably connected to one end of the first joint bar (411) and one end of the fourth joint bar (414), respectively, and a 3-2 tilt member (423B) whose both ends are rotatably connected to the other end of the first joint bar (411) and the other end of the fourth joint bar (414), respectively.

[0097] The fourth tilt member (424) may include a 4-1 tilt member (424A) whose both ends are rotatably connected to one end of the second joint bar (412) and one end of the fourth joint bar (414), respectively, and a 4-2 tilt member (424B) whose both ends are rotatably connected to the other end of the second joint bar (412) and the other end of the fourth joint bar (414), respectively.

[0098] The rear surface of the 1-1 tilt member 421A and the rear surface of the 1-2 tilt member 421B may be connected by a plate-shaped first connection bar 461. The first connection bar 461 may be provided as a pair of first connection bars 461 spaced apart from each other in the vertical direction.

[0099] The front surface of the 2-1 tilt member 422A and the front surface of the 2-2 tilt member 422B may be connected by a plate-shaped second connection bar 462. The second connection bar 462 may be provided as a pair of second connection bars 462 spaced apart from each other in the vertical direction.

[0100] The rear surface of the 3-1 tilt member 423A and the rear surface of the 3-2 tilt member 423B may be connected by a plate-shaped third connection bar 463. The third connection bar 463 may be provided as a pair of third connection bars 463 spaced apart from each other in the vertical direction.

[0101] The front surface of the 4-1 tilt member 424A and the front surface of the 4-2 tilt member 424B may be connected by a plate-shaped fourth connection bar 464. The fourth connection bar 464 may be provided as a pair of fourth connection bars 464 spaced apart from each other in the vertical direction.

[0102] 6 is an exploded perspective view showing the fourth joint bar and the 3-1 tilt member shown in FIG. 4, and FIG. 7 is a cross-sectional view of the combined state of FIG.

[0103] 6 and 7, the fourth joint bar 414 may be formed in the shape of a hollow pipe. Specifically, the fourth joint bar 414 may be formed in the shape of a hollow circular pipe.

[0104] Of course, the first joint bar 411, the second joint bar 412, and the third joint bar 413, as well as the fourth joint bar 414, can also be formed in a hollow pipe shape. That is, the joint bars 411, 412, 413, and 414 can be formed in a hollow pipe shape, which reduces the weight of the tilt drive unit 400 and makes the tilt operation of the tilt drive unit 400 smoother.

[0105] The 3-1 tilt member 423A may be formed in the shape of a hollow pipe. Specifically, the 3-1 tilt member 423A may be formed in the shape of a hollow square pipe.

[0106] Of course, like the 3-1 tilt member 423A, the 1-1 tilt member 421A, the 1-2 tilt member 421B, the 2-1 tilt member 422A, the 2-2 tilt member 422B, the 3-2 tilt member 423B, the 4-1 tilt member 424A, and the 2 tilt member 424B may also be formed in a hollow pipe shape. That is, the tilt members 421, 422, 423, and 424 may be formed in a hollow pipe shape, thereby reducing the weight of the tilt drive unit 400 and facilitating the tilt operation of the tilt drive unit 400.

[0107] In addition, bushings 425 may be coupled to both ends of the 3-1 tilt member 423A. Of course, just like the 3-1 tilt member 423A, bushings 425 may also be coupled to both ends of the 1-1 tilt member 421A, 1-2 tilt member 421B, 2-1 tilt member 422A, 2-2 tilt member 422B, 3-2 tilt member 423B, 4-1 tilt member 424A, and 4-2 tilt member 424B. That is, bushings 425 may be coupled to both ends of the tilt members 421, 422, 423, and 424, respectively, and the joint bars 411, 412, 413, and 414 may be rotatably coupled to the bushings 425. The bushings 425 may be connected to the tilt members 421, 422, 423, and 424 by welding their peripheries. The bushings 425 may facilitate smooth rotation of the tilt members 421, 422, 423, and 424 and reduce rotation noise.

[0108] Although the drawings illustrate an example in which one bushing 425 is connected to each end of the plurality of tilt members 421, 422, 423, 424, a plurality of bushings 425 may be connected to each end of the plurality of tilt members 421, 422, 423, 424. That is, at least one bushing 425 may be connected to each end of the plurality of tilt members 421, 422, 423, 424, and a plurality of joint bars 411, 412, 413, 414 may be rotatably connected to at least one bushing 425.

[0109] When one bushing 425 is coupled to each end of the tilt members 421, 422, 423, 424, the tolerance of the space in which the bushings 425 are installed is relatively small, and the fluidity of the bushings 425 is relatively low, which may result in a less smooth rotation of the tilt members 421, 422, 423, 424. When multiple bushings 425 are coupled to each end of the tilt members 421, 422, 423, 424, the tolerance of the space in which the bushings 425 are installed is relatively large, and the fluidity of the bushings 425 is relatively good, which may result in a smoother rotation of the tilt members 421, 422, 423, 424.

[0110] A plurality of bushes (425) may be installed at both ends of the tilt members (421, 422, 423, 424) in the longitudinal direction of each of the joint bars (411, 412, 413, 414), or a plurality of bushes (425) may be installed in such a way that one bush (425) is inserted inside another bush (425).

[0111] In addition, a clip through hole 415 may be formed at the end of the fourth joint bar 414. The clip through hole 415 may be formed at each end of the fourth joint bar 414. A fourth clip C4 may pass through the clip through hole 415 to connect the fourth joint bar 414 to the 3-1 tilt member 423A.

[0112] Of course, clip through-holes 415 may be formed at both ends of each of the first joint bar 411, the second joint bar 412, and the third joint bar 413, just like the fourth joint bar 414. That is, clip through-holes 415 are formed at both ends of the joint bars 411, 412, 413, and 414, and a plurality of clips (C1, C2, C3, C4, and C4, see FIG. 3) pass through the clip through-holes 415 formed at both ends of the joint bars 411, 412, 413, and 414, respectively, to connect the joint bars 411, 412, 413, and 414 to the tilt members 421, 422, 423, and 424, respectively. Here, the plurality of clips (C1, C2, C3, C4) can be used as a plurality of fixing fastening members together with a plurality of snap rings (SR1, SR2, SR3, SR4, see FIGS. 43 and 44). That is, the plurality of fixing fastening members can have the function of connecting both ends of the plurality of joint bars (411, 412, 413, 414) to the plurality of tilt members (421, 422, 423, 424), respectively.

[0113] 8 is a perspective view showing the nut member, screw bar, and tilt motor shown in FIGS. 4 and 5, FIG. 9 is a bottom perspective view of FIG. 8, FIG. 10 is an exploded perspective view showing the upper part of FIGS. 8 and 9, FIG. 11 is a bottom perspective view of FIG. 10, FIG. 12 is an exploded perspective view showing the lower part of FIGS. 8 and 9, and FIG. 13 is a bottom perspective view of FIG. 12.

[0114] 8 to 13, a hollow pipe-shaped first coupling frame 435 may be disposed on the nut member 430. The first coupling frame 435 may be coupled to the underside of the nut member 430. The first coupling frame 435 may be formed in the shape of a hollow square pipe, but may also be formed in various other pipe shapes, including a circular shape, as long as the first coupling frame 435 has a hollow structure.

[0115] A first through hole (435A) through which the third joint bar (413) passes may be formed on both sides of the first coupling frame (435). A second through hole (435B) through which the screw bar (440) passes may be formed on the top and bottom sides of the first coupling frame (435). A third through hole (413A) through which the screw bar (440) passes may be formed in the third joint bar (413). The third through hole (413A) may be formed in the middle of the left and right lengths of the third joint bar (413).

[0116] The tilt drive unit 400 may further include a mounting bracket 460 and a manual tilt adjustment member 445. The mounting bracket 460 may be disposed on the fourth joint bar 414. The mounting bracket 460 may be formed in a plate shape with horizontal upper and lower surfaces. The manual tilt adjustment member 445 may be rotatably disposed on the mounting bracket 460.

[0117] The manual tilt adjustment member 445 may be coupled to the upper end of the screw bar 440. An operator can manually tilt the antenna unit 200 by rotating the manual tilt adjustment member 445 using a tool such as a wrench to rotate the screw bar 440. In this case, the tilt motor 450 may not be provided. If the tilt motor 450 is provided, the rotation shaft of the tilt motor 450 may be coupled to the manual tilt adjustment member 445.

[0118] A hollow pipe-shaped second coupling frame 465 may be disposed on the mounting bracket 460. The second coupling frame 465 may be coupled to the underside of the mounting bracket 460. The second coupling frame 465 may be formed in the shape of a hollow square pipe, but may also be formed in various pipe shapes, including a circular shape, as long as the second coupling frame 465 has a hollow structure.

[0119] A fourth through-hole (465A) through which the fourth joint bar (414) passes may be formed on both sides of the second coupling frame (465). A fifth through-hole (465B) through which the screw bar (440) passes may be formed on the lower side of the second coupling frame (465). A sixth through-hole (465C) through which the manual tilt adjustment member (445) passes may be formed on the upper side of the second coupling frame (465). The upper end of the screw bar (440) and the lower end of the manual tilt adjustment member (445) may be coupled to each other through a coupler in the internal space of the second coupling frame (465). A seventh through-hole (414A) through which the coupling portion of the screw bar (440) and the manual tilt adjustment member (445) passes may be formed on the fourth joint bar (414). The seventh through-hole (414A) may be formed in the middle of the left and right lengths of the fourth joint bar (414).

[0120] The tilt motor 450 can be mounted on a mounting bracket 460. The tilt motor 450 can be mounted on the top surface of the mounting bracket 460. When the tilt motor 450 is mounted on the mounting bracket 460, the rotation shaft of the tilt motor 450 is connected to the manual tilt adjustment member 445, and can rotate the screw bar 440.

[0121] FIG. 14 is a view showing another embodiment of the antenna mounting unit and the mast mounting unit shown in FIG. 4, and FIG. 15 is a view showing the antenna mounting unit shown in FIG. 14 with a reinforcing plate added.

[0122] 14 and 15, the pole mounting unit 700 may include a front horizontal bracket 710 and a rear horizontal bracket 720. The front horizontal bracket 710 and the rear horizontal bracket 720 may be arranged horizontally. The front horizontal bracket 710 and the rear horizontal bracket 720 may be arranged at the same height. The front horizontal bracket 710 and the rear horizontal bracket 720 may be connected by a pair of long bolts. The pair of long bolts are each fastened with a nut, so that a recess formed on the rear surface of the front horizontal bracket 710 can be tightly fixed to the front surface of the pole 100, and a recess formed on the front surface of the rear horizontal bracket 720 can be tightly fixed to the rear surface of the pole 100.

[0123] A hollow rectangular pipe-shaped connector (715) may be installed on the front horizontal bracket (710) so as to protrude forward. The connector (715) may be a pair of connectors (715) spaced apart from each other in the left-right direction. Both ends of the first joint bar (411) may be connected to the pair of connectors (715), respectively.

[0124] The pair of connecting parts (715) may each have an insertion hole leading to the left and right, and both ends of the front horizontal bracket (710) may be inserted into the insertion holes formed in the pair of connecting parts (715), respectively, and then the frame may be welded (W).

[0125] In addition, a pair of vertical brackets (620, 630) of the antenna mounting unit (600) may have insertion holes formed on the front surface thereof, leading to the left and right, respectively, and both ends of the horizontal bracket (610) may be inserted into the insertion holes formed on the pair of vertical brackets (620, 630), respectively, and then the frame may be welded (W).

[0126] In addition, a pair of insertion holes that run from front to back are formed in the horizontal bracket (610) of the antenna mounting unit (600), and a pair of coupling parts (615) are inserted into the pair of insertion holes formed in the horizontal bracket (610), respectively, and then the frame may be welded (W).

[0127] In addition, a pair of reinforcing plates 617 may be fastened to the rear surface of the horizontal bracket 610 of the antenna mounting unit 600 and to one side of each of the pair of coupling portions 615. Each of the pair of reinforcing plates 617 may be formed in a triangular plate shape, with one side welded to the rear surface of the horizontal bracket 610 and the other side adjacent to the one side welded to the side of the coupling portion 615.

[0128] As described above, through the insertion and welding (W) structure of the front horizontal bracket (710) and the pair of connecting parts (715), the insertion and welding (W) structure of the horizontal bracket (610) and the pair of vertical brackets (620, 630), the insertion and welding (W) structure of the horizontal bracket (610) and the pair of connecting parts (615), and the reinforcing plate (617) connecting structure of the horizontal bracket (610) and the pair of connecting parts (615), it is possible to ensure rigidity that can firmly support the antenna unit (200) on the support (100).

[0129] In addition, the antenna mounting unit (600) and the mast mounting unit (700) may be formed by connecting square pipe-shaped brackets with hollow interiors, which reduces the weight of the antenna mounting unit (600) and the mast mounting unit (700).

[0130] 16 is a rear perspective view of the lower link unit shown in FIG. 1. FIG.

[0131] Referring to FIG. 16, the lower link unit (300) may include a horizontal bracket (810) formed to be elongated in the horizontal direction, a pair of vertical brackets (820, 830) formed to be elongated in the vertical direction and respectively coupled to both ends of the horizontal bracket (810), and a fifth joint bar (840).

[0132] A pair of coupling portions (815) may be formed on the rear surface of the horizontal bracket (810) to protrude rearward, and a pair of vertical brackets (820, 830) may be fastened to the rear surface of the antenna unit (200) by bolts or screws.

[0133] A pole mounting unit 900 may be connected to the lower part of the pole 100. A fifth joint bar 840 may be connected to the pole mounting unit 900. A pair of connecting portions 815 formed on the horizontal bracket 810 may be connected to the fifth joint bar 840 so as to be rotatable up and down. The pair of connecting portions 815 may rotate around the fifth joint bar 840.

[0134] A bushing 816 may be connected to each of the pair of connecting portions 815. The bushing 816 may be connected to each of the pair of connecting portions 815 in the same structure as the bushing 425 connected to both ends of each of the tilt members 421, 422, 423, 424. The bushing 816 may be connected to each of the pair of connecting portions 815 by welding the periphery of each. The bushing 816 may facilitate smooth rotation of the pair of connecting portions 815 and reduce rotational noise.

[0135] Although the drawings illustrate an example in which one bush 816 is connected to each of the pair of connecting portions 815, a plurality of bushes 816 may be connected to each of the pair of connecting portions 815. That is, at least one bush 816 may be connected to each of the pair of connecting portions 815, and the fifth joint bar 840 may be rotatably connected to at least one bush 816.

[0136] When a pair of bushings 816 are coupled to each of the pair of coupling parts 815, the tolerance of the space in which the bushings 816 are installed is relatively small, and the fluidity of the bushings 816 is relatively reduced, which may result in a relatively unsmooth rotation of the pair of coupling parts 815. When multiple bushings 816 are coupled to each of the pair of coupling parts 815, the tolerance of the space in which the multiple bushings 816 are installed is relatively large, and the fluidity of the multiple bushings 816 is relatively improved, which may result in a relatively smooth rotation of the pair of coupling parts 815.

[0137] A plurality of bushes (816) may be installed in each of the pair of connecting portions (816) in the longitudinal direction of the fifth joint bar (840), or a plurality of bushes (816) may be installed in such a way that one bush (816) is inserted inside another bush (816).

[0138] Meanwhile, after the pole mounting units 900 are coupled to both ends of the fifth joint bar 840, fifth clips C5 may be installed at both ends of the fifth joint bar 840. The fifth clips C5 may be installed at both ends of the fifth joint bar 840 in the same structure as the plurality of clips C1, C2, C3, C4 installed at both ends of the plurality of joint bars 411, 412, 413, 414. The fifth clips C5 may prevent the fifth joint bar 840 from separating from the pair of coupling portions 815 and the pole mounting units 900.

[0139] FIG. 17 is a side view showing an antenna apparatus according to a second embodiment of the present invention.

[0140] Referring to FIG. 17, the tilt drive unit (400) of the antenna device (2) according to the second embodiment of the present invention may be formed with a structure different from that of the tilt drive unit (400) of the antenna device (1) according to the first embodiment described above.

[0141] The specific structure of the tilt drive unit 400 of the antenna device 2 according to the second embodiment of the present invention will be described in detail below. However, in the tilt drive unit 400 of the antenna device 2 according to the second embodiment of the present invention, components that perform the same functions as the tilt drive unit 400 of the antenna device 1 according to the first embodiment of the present invention described above will be assigned the same reference numerals, and detailed descriptions thereof will be omitted, and only differences will be described.

[0142] 18 is an enlarged view of the lower link unit and tilt drive unit shown in FIG. 17, FIG. 19 is a front perspective view of FIG. 18, FIG. 20 is a rear perspective view of FIG. 18, FIG. 21 is a cross-sectional view of the tilt drive unit shown in FIG. 18, FIG. 22 is a tilt operation diagram of FIG. 21, and FIG. 23 is a view of FIG. 21 excluding the tilt motor.

[0143] 18 to 23, the tilt drive unit (400) of the antenna device (1) according to the first embodiment of the present invention includes four joint bars (411, 412, 413, 414) and four tilt members (421, 422, 423, 424), while the tilt drive unit (400) of the antenna device (2) according to the second embodiment of the present invention includes three joint bars (411, 412, 413) and two tilt members (422).

[0144] That is, the tilt drive unit 400 of the antenna device 2 according to the second embodiment of the present invention may include a first joint bar 411, a second joint bar 412 spaced forward from the first joint bar 411 and arranged parallel to the first joint bar 411, and a third joint bar 413 spaced downward between the first joint bar 411 and the second joint bar 412 and arranged parallel to the first joint bar 411 and the second joint bar 412. However, the third joint bar 413 may also be spaced upward between the first joint bar 411 and the second joint bar 412 and arranged parallel to the first joint bar 411 and the second joint bar 412.

[0145] In addition, the tilt drive unit (400) of the antenna device (2) according to the second embodiment of the present invention may include a first tilt member (421) whose both ends are rotatably connected to the first joint bar (411) and the third joint bar (413), respectively, and a second tilt member (422) whose both ends are rotatably connected to the second joint bar (412) and the third joint bar (413), respectively.

[0146] In addition, while the tilt drive unit (400) of the antenna device (1) according to the first embodiment of the present invention has a plurality of tilt members (421, 422, 423, 424) formed in a pipe shape with an open interior, the tilt drive unit (400) of the antenna device (2) according to the second embodiment of the present invention may have a plurality of tilt members (421, 422) formed in a plate shape.

[0147] In addition, while the tilt drive unit (400) of the antenna device (1) according to the first embodiment of the present invention has a plurality of clips (C1, C2, C3, C4) fastened to both ends of the plurality of joint bars (411, 412, 413, 414), respectively, to connect the plurality of joint bars (411, 412, 413, 414) to the plurality of tilt members (421, 422, 423, 424), respectively, the tilt drive unit (400) of the antenna device (2) according to the second embodiment of the present invention has a plurality of bolts (B1, B2, B3) fastened to both ends of the plurality of joint bars (411, 412, 413), respectively, to connect the plurality of joint bars (411, 412, 413) to the plurality of tilt members (421, 422), respectively.

[0148] In addition, while the tilt drive unit (400) of the antenna device (1) according to the first embodiment of the present invention is separated from the lower link unit (300), the front end of the tilt drive unit (400) of the antenna device (2) according to the second embodiment of the present invention can be connected to the front end of the lower link unit (300) through the antenna mounting unit (600).

[0149] 24 is a perspective view showing the tilt drive unit shown in FIG. 17, FIG. 25 is a rear bottom perspective view of FIG. 24, FIG. 26 is a drawing showing the internal structure of FIGS. 24 and 25, and FIG. 27 is a bottom perspective view of FIG.

[0150] Referring to Figures 23 to 27, the tilt drive unit (400) of the antenna device (2) according to the second embodiment of the present invention may further include a first connecting plate (421C) and a second connecting plate (422C) compared to the tilt drive unit (400) of the antenna device (1) according to the first embodiment described above.

[0151] The first connecting plate (421C) can connect the 1-1 tilt member (421A) and the 1-2 tilt member (421B), and the second connecting plate (422C) can connect the 2-1 tilt member (422A) and the 2-2 tilt member (422B).

[0152] The first connecting plate (421C) and the second connecting plate (422C) each have a plurality of holes formed therein, which may reduce the weight.

[0153] The 1-1 tilt member (421A) and the 1-2 tilt member (421B) may be formed by bending the first connecting plate (421C), and the 2-1 tilt member (422A) and the 2-2 tilt member (422B) may be formed by bending the second connecting plate (422C).

[0154] The 1-1 tilt member 421A may be formed by bending the left end of the first connecting plate 421C backward, and the 1-2 tilt member 421B may be formed by bending the right end of the first connecting plate 421C backward. The 2-1 tilt member 422A may be formed by bending the left end of the second connecting plate 422C forward, and the 2-2 tilt member 422B may be formed by bending the right end of the second connecting plate 422C forward.

[0155] The nut member 430 may be partially inserted into a hole formed in the center of the third joint bar 413 so as to penetrate vertically. The screw bar 440 rotates the first tilt member 421 and the second tilt member 422, thereby tilting the antenna unit 200.

[0156] The mounting bracket 460 may include an upper plate portion and a side plate portion, where the upper plate portion is disposed horizontally to form the upper surface of the mounting bracket 460, and the side plate portions are bent downward from both left and right ends of the upper plate portion to form the side surfaces of the mounting bracket 460.

[0157] The manual tilt adjustment member 445 may be rotatably disposed on an upper surface of the mounting bracket 460. The tilt motor 450 may be mounted on the upper surface of the mounting bracket 460.

[0158] A first guide hole (466) may be formed on the side of the mounting bracket (460). The first guide holes (466) may be formed on both side surfaces of the mounting bracket (460). Both ends of the third joint bar (413) may be inserted into the first guide holes (466) formed on both side surfaces of the mounting bracket (460). The first guide holes (466) may be formed long in the vertical direction, and may guide the third joint bar (413) up and down when the screw bar (440) rotates.

[0159] A second guide hole 427 may be formed in the first tilt member 421 and the second tilt member 422. The second guide hole 427 may be formed in the first tilt member 421A, the first second tilt member 421B, the second first tilt member 422A, and the second second tilt member 422B.

[0160] A guide protrusion 467 may be formed on the side of the mounting bracket 460. When the third joint bar 413 moves up and down along the first guide hole 466, the guide protrusion 467 moves along the second guide hole 427 to guide the rotation of the first tilt member 421 and the second tilt member 422.

[0161] At least the upper portion of the guide protrusion (467) may be positioned above the first guide hole (466). A pair of guide protrusions (467) may be formed on each side of the mounting bracket (460). Of the pair of guide protrusions (467) formed on the left side of the mounting bracket (460), the rearwardly positioned guide protrusion (467) may pass through the second guide hole (427) formed in the first-first tilt member (421A), and the frontwardly positioned guide protrusion (467) may pass through the second guide hole (427) formed in the second-first tilt member (422A). Of the pair of guide protrusions (467) formed on the right side of the mounting bracket (460), the rear guide protrusion (467) can pass through the second guide hole (427) formed in the 1-2 tilt member (421B), and the front guide protrusion (467) can pass through the second guide hole (427) formed in the 2-2 tilt member (422B).

[0162] FIG. 28 is a side view showing an antenna device according to a third embodiment of the present invention, and FIG. 29 is a view showing a state in which the tilt driving unit shown in FIG. 28 tilts the antenna unit.

[0163] Referring to Figures 28 and 29, the tilt drive unit (400) of the antenna device (3) according to the third embodiment of the present invention may be formed with a structure different from that of the tilt drive unit (400) of the antenna device (1) according to the first embodiment of the present invention described above.

[0164] The specific structure of the tilt drive unit 400 of the antenna device 3 according to the third embodiment of the present invention will be described in detail below. However, in the tilt drive unit 400 of the antenna device 3 according to the third embodiment of the present invention, components that perform the same functions as the tilt drive unit 400 of the antenna device 1 according to the first embodiment of the present invention will be assigned the same reference numerals, and detailed descriptions thereof will be omitted, and only differences will be described.

[0165] Figure 30 is an enlarged view of the tilt drive unit shown in Figure 28, Figure 31 is a front perspective view of Figure 30, and Figure 32 is a rear bottom perspective view of Figure 30. Here, the plurality of joint bars (411, 412, 413, 414) are shown to be shaft-shaped, but this is only a schematic illustration of the plurality of joint bars (411, 412, 413, 414), and the plurality of joint bars (41, 412, 413, 414) may actually be hollow pipe-shaped like the plurality of joint bars (411, 412, 413, 414) of the tilt drive unit (400) of the antenna device (1) according to the first embodiment of the present invention.

[0166] 30 to 32, in the tilt drive unit 400 of the antenna device 1 according to the first embodiment of the present invention, the plurality of tilt members 421, 422, 423, 424 are formed in the shape of hollow pipes, whereas in the tilt drive unit 400 of the antenna device 3 according to the third embodiment of the present invention, the plurality of tilt members 421, 422, 423, 424 can be formed in the shape of blocks. Therefore, the tilt drive unit 400 of the antenna device 3 according to the third embodiment of the present invention can have a simpler structure than the tilt drive unit 400 of the antenna device 1 according to the first embodiment of the present invention.

[0167] In addition, in the tilt drive unit 400 of the antenna device 1 according to the first embodiment of the present invention, the first joint bar 411 is connected to the mast mounting unit 700 and the second joint bar 422 is connected to the antenna mounting unit 600, but the antenna device 3 according to the third embodiment of the present invention does not have the mast mounting unit 700 and the antenna mounting unit 600 of the first embodiment. Since the antenna device 3 according to the third embodiment of the present invention does not have the mast mounting unit 700 and the antenna mounting unit 600 of the antenna device 1 according to the first embodiment of the present invention, the number of parts can be reduced.

[0168] Instead, the tilt driving unit (400) of the antenna device (3) according to the third embodiment of the present invention may have a first connecting block (421D) protruding from the rear surface of the first tilt member (421) to be connected to the support (100), and a second connecting block (422D) protruding from the front surface of the second tilt member (422) to be connected to the rear surface of the antenna unit (200).

[0169] The first connecting block (421D) is attached to the support (100) by bolts or welding, and the rear surface of the first connecting block (421D) can contact the front surface of the support (100), and the second connecting block (422D) is attached to the antenna unit (200) by bolts or welding, and the front surface of the second connecting block (422D) can contact the rear surface of the antenna unit (200).

[0170] In addition, the tilt drive unit (400) of the antenna device (3) according to the third embodiment of the present invention may have a first rotary coupling part (421E) and a second rotary coupling part (421F) protruding from the first tilt member (421), a third rotary coupling part (422E) and a fourth rotary coupling part (422F) protruding from the second tilt member (422), a fifth rotary coupling part (423E) and a sixth rotary coupling part (423F) protruding from the third tilt member (423), and a seventh rotary coupling part (424E) and an eighth rotary coupling part (424F) protruding from the fourth tilt member (424).

[0171] The first rotary coupling part 421E may be formed to protrude forward from the front left part of the first tilt member 421, and the second rotary coupling part 421F may be formed to protrude forward from the front right part of the first tilt member 421. Both ends of the first rotary coupling part 421E may be rotatably coupled to the left end part of the first joint bar 411 and the left end part of the third joint bar 413, respectively. Both ends of the second rotary coupling part 421F may be rotatably coupled to the right end part of the first joint bar 411 and the right end part of the third joint bar 413, respectively.

[0172] The third rotary coupling 422E may be formed to protrude rearward from the left side of the rear surface of the second tilt member 422, and the fourth rotary coupling 422F may be formed to protrude rearward from the right side of the rear surface of the second tilt member 422. The third rotary coupling 422E and the fourth rotary coupling 422F may be disposed between the first rotary coupling 421E and the second rotary coupling 421F. The left side of the third rotary coupling 422E may contact the right side of the first rotary coupling 421E, and the right side of the fourth rotary coupling 422F may contact the left side of the second rotary coupling 421F. The left side of the third rotary coupling 422E may contact the right side of the seventh rotary coupling 424E, and the right side of the fourth rotary coupling 422F may contact the left side of the eighth rotary coupling 424F. Both ends of the third rotating coupling part 422E can be rotatably coupled to the left end of the second joint bar 412 and the left end of the third joint bar 413, respectively. Both ends of the fourth rotating coupling part 422F can be rotatably coupled to the right end of the second joint bar 412 and the right end of the third joint bar 413, respectively.

[0173] The fifth rotating coupling part 423E may be formed to protrude forward from the front left side of the third tilt member 423, and the sixth rotating coupling part 423F may be formed to protrude forward from the front right side of the third tilt member 423. The fifth rotating coupling part 423E and the sixth rotating coupling part 423F may be disposed between the seventh rotating coupling part 424E and the eighth rotating coupling part 424F. The left side of the fifth rotating coupling part 423E may contact the right side of the seventh rotating coupling part 424E, and the right side of the sixth rotating coupling part 424F may contact the left side of the eighth rotating coupling part 424F. Both ends of the fifth rotating coupling part 423E may be rotatably coupled to the left end of the first joint bar 411 and the left end of the fourth joint bar 414, respectively. Both ends of the sixth rotation coupling part (423F) can be rotatably coupled to the right end of the first joint bar (411) and the right end of the fourth joint bar (414), respectively.

[0174] The seventh rotating coupling part 424E may be formed to protrude rearward from the left rear part of the rear surface of the fourth tilt member 424, and the eighth rotating coupling part 424F may be formed to protrude rearward from the right rear part of the rear surface of the fourth tilt member 424. Both ends of the seventh rotating coupling part 424E may be rotatably coupled to the left end part of the second joint bar 412 and the left end part of the fourth joint bar 414, respectively. Both ends of the eighth rotating coupling part 424F may be rotatably coupled to the right end part of the second joint bar 412 and the right end part of the fourth joint bar 414, respectively.

[0175] Meanwhile, in the tilt drive unit (400) of the antenna device (3) according to the third embodiment of the present invention, the third joint bar (413) can pass through the nut member (430) from side to side, the screw bar (440) can pass through the nut member (430) and the third joint bar (413) from top to bottom, and the fourth joint bar (414) can pass through the tilt motor (450) from side to side.

[0176] Of course, when the nut member (430) is installed on the fourth joint bar (414) and the tilt motor (450) is installed on the third joint bar (413), the fourth joint bar (414) can penetrate the nut member (430) from side to side, the screw bar (440) can penetrate the nut member (430) and the fourth joint bar (414) from top to bottom, and the third joint bar (413) can penetrate the tilt motor (450) from side to side.

[0177] FIG. 33 is a diagram showing a state in which the tilt driving unit of the antenna apparatus according to the fourth embodiment of the present invention tilts the antenna unit.

[0178] Referring to FIG. 33, the tilt drive unit (400) of the antenna device (4) according to the fourth embodiment of the present invention may be formed with a structure different from that of the tilt drive unit (400) of the antenna device (3) according to the third embodiment of the present invention described above.

[0179] The specific structure of the tilt drive unit 400 of the antenna device 4 according to the fourth embodiment of the present invention will be described in detail below. However, in the tilt drive unit 400 of the antenna device 4 according to the fourth embodiment of the present invention, components that perform the same functions as the tilt drive unit 400 of the antenna device 3 according to the third embodiment of the present invention described above will be assigned the same reference numerals, and detailed descriptions thereof will be omitted, and only differences will be described.

[0180] In the tilt drive unit (400) of the antenna device (3) according to the third embodiment of the present invention, the lengths between both ends of the first tilt member (421), the second tilt member (422), the third tilt member (423) and the fourth tilt member (424) are all the same.

[0181] However, in the tilt drive unit (400) of the antenna device (3) according to the fourth embodiment of the present invention, the lengths between both ends of the first tilt member (421) and the second tilt member (422) may be the same as each other, i.e., a first length, and the lengths between both ends of the third tilt member (423) and the fourth tilt member (424) may be the same as each other, i.e., a second length, and the first length may be longer than the second length, and the second length may be shorter than the first length. However, the second length may be longer than the first length, and the first length may be shorter than the second length. That is, the first length and the second length may be different from each other.

[0182] FIG. 34 is a view showing a state in which the tilt driving unit of the antenna apparatus according to the fifth embodiment of the present invention tilts the antenna unit.

[0183] Referring to FIG. 34, the tilt drive unit (400) of the antenna device (5) according to the fifth embodiment of the present invention may be formed with a structure different from that of the tilt drive unit (400) of the antenna device (3) according to the third embodiment of the present invention described above.

[0184] The specific structure of the tilt drive unit 400 of the antenna device 5 according to the fifth embodiment of the present invention will be described in detail below. However, in the tilt drive unit 400 of the antenna device 5 according to the fifth embodiment of the present invention, components that perform the same functions as the tilt drive unit 400 of the antenna device 3 according to the third embodiment of the present invention described above will be assigned the same reference numerals, and detailed descriptions thereof will be omitted, and only differences will be described.

[0185] The lengths between both ends of the first tilt member (421), the second tilt member (422), the third tilt member (423) and the fourth tilt member (424) of the tilt drive unit (400) of the antenna device (3) according to the third embodiment of the present invention are the same.

[0186] Similarly, like the first tilt member (421), the second tilt member (422), the third tilt member (423) and the fourth tilt member of the tilt drive unit (400) of the antenna device (5) according to the fifth embodiment of the present invention, the lengths between both ends of the first tilt member (421), the second tilt member (422) and the fourth tilt member (424) of the tilt drive unit (400) of the antenna device (5) according to the fifth embodiment of the present invention are formed to be the same length. However, the lengths between the two ends of the first tilt member (421), the second tilt member (422), the third tilt member (423), and the fourth tilt member (424) of the tilt drive unit (400) of the antenna device (5) according to the fifth embodiment of the present invention are shorter than the lengths between the two ends of the first tilt member (421), the second tilt member (422), the third tilt member (423), and the fourth tilt member (424) of the tilt drive unit (400) of the antenna device (3) according to the third embodiment of the present invention described above.

[0187] FIG. 35 is a diagram showing an antenna device according to a sixth embodiment of the present invention.

[0188] Referring to FIG. 35, the tilt drive unit 400 of the antenna device 6 according to the sixth embodiment of the present invention may be formed in a structure different from that of the tilt drive unit 400 of the antenna device 1 according to the first embodiment described above.

[0189] The specific structure of the tilt drive unit 400 of the antenna device 6 according to the sixth embodiment of the present invention will be described in detail below. However, in the tilt drive unit 400 of the antenna device 6 according to the sixth embodiment of the present invention, components that perform the same functions as the tilt drive unit 400 of the antenna device 1 according to the first embodiment of the present invention will be assigned the same reference numerals, and detailed descriptions thereof will be omitted, and only the differences will be described.

[0190] Figure 36 is a drawing showing a state in which the tilt drive unit shown in Figure 35 has tilted the antenna unit so that the front surface of the antenna unit faces downward, Figure 37 is a drawing showing a state in which the tilt drive unit shown in Figure 35 has tilted the antenna unit so that the front surface of the antenna unit faces upward, Figure 38 is an enlarged drawing of the tilt drive unit shown in Figure 35, Figure 39 is a front perspective view of Figure 38, and Figure 40 is a rear bottom perspective view of Figure 38.

[0191] Referring to Figures 36 to 40, in the tilt drive unit (400) of the antenna device (1) according to the first embodiment of the present invention, the first joint bar (411) is connected to the support mounting unit (700), and the second joint bar (422) is connected to the antenna mounting unit (600).

[0192] However, in the tilt drive unit (400) of the antenna device (6) according to the sixth embodiment of the present invention, the first joint bar (411) is not connected to the support mounting unit (700), and the second joint bar (422) is not connected to the antenna mounting unit (600).

[0193] Alternatively, in the tilt drive unit 400 of the antenna device 6 according to the sixth embodiment of the present invention, the rear surface of the third tilt member 423 can be connected to the pole mounting unit 700, and the front surface of the fourth tilt member 424 can be connected to the antenna mounting unit 600. The rear surface of the third tilt member 423 can be connected to the pole mounting unit 700 by bolts or welding, and the front surface of the fourth tilt member 424 can be connected to the antenna mounting unit 600 by bolts or welding.

[0194] The pole mounting unit 700 may have a sloped surface at a portion coupled to the rear surface of the third tilt member 423, and the antenna mounting unit 600 may have a sloped surface at a portion coupled to the front surface of the fourth tilt member 424. The sloped surface formed on the pole mounting unit 700 may be formed on a horizontal bracket forming the front portion of the mounting clamp 700, and the sloped surface formed on the antenna mounting unit 600 may be formed on the horizontal bracket 610.

[0195] In the tilt drive unit (400) of the antenna device (6) according to the sixth embodiment of the present invention, the support mounting unit (700) is connected to the third tilt member (423), so that the load acting from the support (100) can be distributed to the first joint bar (411) and the fourth joint bar (414), and the antenna mounting unit (600) is connected to the fourth tilt member (424), so that the load acting from the antenna unit (200) can be distributed to the second joint bar (412) and the fourth joint bar (414), which can smooth the tilt operation of the tilt drive unit (400).

[0196] 41 is a perspective view showing another embodiment of the bush shown in FIG. 6, and FIG. 42 is a side view of FIG.

[0197] 41 and 42, in the tilt drive unit 400 of the antenna device 1 according to the first embodiment of the present invention, bushes 425 are installed at both ends of the plurality of tilt members 421, 422, 423, and 424, as shown in FIG. 6. In this embodiment, one side of the bushes 425 may be cut to form cutouts 425A. At least a portion of the bushes 425 opposite the cutouts 425A may be welded in an arc shape (W) to the plurality of tilt members 421, 422, 423, and 424. FIG. 42 shows a bush 425 welded in a semicircular shape (W), as an example of an arc shape.

[0198] Therefore, the bushings (425) installed at both ends of the tilt members (421, 422, 423, 424) are flexible and movable at the cutouts (425A) at the portions that are not welded (W) to the tilt members (421, 422, 423, 424). This allows the tilt members (421, 422, 423, 424) to rotate smoothly relative to the joint bars (411, 412, 413, 414) during rotation, resulting in smooth operation of the tilt drive unit (400).

[0199] Meanwhile, although the joint bars (411, 412, 413, 414) of the tilt drive unit (400) in the above-described embodiment are connected to the tilt members (421, 422, 423, 424) through the clips (C1, C2, C3, C4), they may also be connected to the tilt members (421, 422, 423, 424) through snap rings instead of the clips (C1, C2, C3, C4). This will be described below with reference to Figures 43 and 44.

[0200] FIG. 43 is a view showing another embodiment of the tilt drive unit shown in FIG. 36, and FIG. 44 is an exploded view of the fourth snap ring of the fourth joint bar shown in FIG.

[0201] 43 and 44, after the 1-1 tilt member 421A, the 1-2 tilt member 421B, the 3-1 tilt member 423A, and the 3-2 tilt member 423B are rotatably coupled to the first joint bar 411, a first snap ring SR1 may be installed on each end of the first joint bar 411. The first snap ring SR1 can prevent the first joint bar 411 from separating from the 1-1 tilt member 421A, the 1-2 tilt member 421B, the 3-1 tilt member 423A, and the 3-2 tilt member 423B.

[0202] After the 2-1 tilt member 422A, the 2-2 tilt member 422B, the 4-1 tilt member 424A, and the 4-2 tilt member 424B are rotatably coupled to the second joint bar 412, second snap rings SR2 may be installed on both ends of the second joint bar 412. The second snap rings SR2 can prevent the second joint bar 412 from separating from the 2-1 tilt member 422A, the 2-2 tilt member 422B, the 4-1 tilt member 424A, and the 4-2 tilt member 424B.

[0203] After the 1-1 tilt member 421A, the 1-2 tilt member 421B, the 2-1 tilt member 422A, and the 2-2 tilt member 422B are rotatably coupled to the third joint bar 413, third snap rings SR3 may be installed on both ends of the third joint bar 413. The third snap rings SR3 can prevent the third joint bar 413 from separating from the 1-1 tilt member 421A, the 1-2 tilt member 421B, the 2-1 tilt member 422A, and the 2-2 tilt member 422B.

[0204] After the 3-1 tilt member (423A), the 3-2 tilt member (423B), the 4-1 tilt member (424A), and the 4-2 tilt member (424B) are rotatably coupled to the fourth joint bar (414), a fourth snap ring (SR4) may be installed on each end of the fourth joint bar (414). The fourth snap ring (SR4) can prevent the fourth joint bar (414) from separating from the 3-1 tilt member (423A), the 3-2 tilt member (423B), the 4-1 tilt member (424A), and the 4-2 tilt member (424B).

[0205] 44, a snap ring coupling groove 417 may be formed on the outer peripheral surface of the end of the fourth joint bar 414. The snap ring coupling groove 417 may be formed on the outer peripheral surface of each end of the fourth joint bar 414. A fourth snap ring SR4 is coupled to the snap ring coupling groove 417, thereby coupling the fourth joint bar 414 to the 3-1 tilt member 423A.

[0206] Of course, like the fourth joint bar 414, snap ring coupling grooves 417 may also be formed on the outer circumferential surfaces of both ends of each of the first joint bar 411, the second joint bar 412, and the third joint bar 413. That is, snap ring coupling grooves 417 may be formed on the outer circumferential surfaces of both ends of the plurality of joint bars 411, 412, 413, and 414, and a plurality of snap rings SR1, SR2, SR3, and SR4 may be respectively coupled to the snap ring coupling grooves 417 formed on the outer circumferential surfaces of both ends of the plurality of joint bars 411, 412, 413, and 414, thereby coupling the plurality of joint bars 411, 412, 413, and 414 to the plurality of tilt members 421, 422, 423, and 424, respectively.

[0207] The multiple snap rings (SR1, SR2, SR3, SR4) can be formed in various shapes such as C-type and E-type.

[0208] FIG. 45 is a side view showing an antenna apparatus according to a seventh embodiment of the present invention.

[0209] Referring to FIG. 45, the tilt drive unit 400 of the antenna device 7 according to the seventh embodiment of the present invention may be formed in a structure different from that of the tilt drive unit 400 of the antenna device 1 according to the first embodiment described above.

[0210] The specific structure of the tilt drive unit 400 of the antenna device 7 according to the seventh embodiment of the present invention will be described in detail below. However, in the tilt drive unit 400 of the antenna device 7 according to the seventh embodiment of the present invention, components that perform the same functions as the tilt drive unit 400 of the antenna device 1 according to the first embodiment of the present invention described above will be assigned the same reference numerals, and detailed descriptions thereof will be omitted, and only differences will be described.

[0211] 46 is a front perspective view showing the tilt drive unit shown in FIG. 45, and FIG. 47 is a rear perspective view showing the tilt drive unit shown in FIG.

[0212] Referring to Figures 46 and 47, the tilt drive unit (400) of the antenna device (7) according to the seventh embodiment of the present invention may be formed to have a slimmer left-right width than the tilt drive unit (400) of the antenna device (1) according to the first embodiment of the present invention described above.

[0213] That is, the left and right width of each of the plurality of tilt members (421, 422, 423, 424) of the tilt drive unit (400) of the antenna device (7) according to the seventh embodiment of the present invention can be made slimmer than the left and right width of each of the plurality of tilt members (421, 422, 423, 424) of the tilt drive unit (400) of the antenna device (1) according to the first embodiment of the present invention described above.

[0214] Therefore, the lateral distance between the pair of coupling portions 615 formed on the horizontal bracket 610 of the antenna device 7 according to the seventh embodiment of the present invention may be narrower than the lateral distance between the pair of coupling portions 615 formed on the horizontal bracket 610 of the antenna device 1 according to the first embodiment of the present invention. In addition, the lateral distance between both sides coupled to both ends of the first joint bar 411 of the pole mounting unit 700 of the antenna device 7 according to the seventh embodiment of the present invention may be narrower than the lateral distance between both sides coupled to both ends of the first joint bar 411 of the pole mounting unit 700 of the antenna device 1 according to the first embodiment of the present invention.

[0215] Furthermore, the left and right widths of the pair of connecting portions (615) formed on the horizontal bracket (610) of the antenna device (7) according to the seventh embodiment of the present invention may be slimmer than the left and right widths of the pair of connecting portions (615) formed on the horizontal bracket (610) of the antenna device (1) according to the first embodiment of the present invention described above.

[0216] Furthermore, the width of both sides of the pole mounting unit (700) of the antenna device (1) according to the first embodiment of the present invention, which are respectively coupled to both ends of the first joint bar (411), can be made slimmer than the width of both sides of the pole mounting unit (700) of the antenna device (7) according to the seventh embodiment of the present invention, which are respectively coupled to both ends of the first joint bar (411).

[0217] In addition, in the antenna device 1 according to the first embodiment of the present invention, a pair of vertical brackets 620, 630 are respectively connected to both ends of a horizontal bracket 610, and the pair of vertical brackets 620, 630 are fastened to the rear surface of the antenna unit 200 by bolts or screws. However, in the antenna device 7 according to the seventh embodiment of the present invention, the pair of vertical brackets 620, 630 are not respectively connected to both ends of a horizontal bracket 610, and both ends of the horizontal bracket 610 can be fastened to the rear surface of the antenna unit 200 by bolts or screws.

[0218] Furthermore, the tilt drive unit (400) of the antenna device (1) according to the first embodiment of the present invention includes a plurality of connecting bars (461, 462, 463, 464), but the tilt drive unit (400) of the antenna device (7) according to the seventh embodiment of the present invention may not include the plurality of connecting bars (461, 462, 463, 464).

[0219] In addition, the tilt drive unit (400) of the antenna device (1) according to the first embodiment of the present invention has a plurality of clips (C1, C2, C3, C4) respectively installed at both ends of a plurality of joint bars (411, 412, 413, 414), but the tilt drive unit (400) of the antenna device (7) according to the seventh embodiment of the present invention may have a plurality of snap rings (SR1, SR2, SR3, SR4) respectively installed at a plurality of joint bars (411, 412, 413, 414). In the tilt drive unit (400) of the antenna device (7) according to the seventh embodiment of the present invention, the structure in which the plurality of snap rings (SR1, SR2, SR3, SR4) are respectively installed at both ends of the plurality of joint bars (411, 412, 413, 414) can be installed in the same structure as the structure in which the plurality of snap rings (SR1, SR2, SR3, SR4) are respectively installed at both ends of the plurality of joint bars (411, 412, 413, 414) described with reference to Figures 43 and 44.

[0220] Meanwhile, referring to FIG. 45, the lower link unit (300) of the antenna device (7) according to the seventh embodiment of the present invention may be formed in a structure different from the lower link unit (300) of the antenna device (1) according to the first embodiment described above.

[0221] The specific structure of the lower link unit 300 of the antenna device 7 according to the seventh embodiment of the present invention will be described in detail below. However, in the lower link unit 300 of the antenna device 7 according to the seventh embodiment of the present invention, components that have the same functions as the lower link unit 300 of the antenna device 1 according to the first embodiment of the present invention will be given the same reference numerals, and detailed descriptions thereof will be omitted, and only differences will be described.

[0222] 48 is a rear perspective view of the lower link unit shown in FIG. 45. FIG.

[0223] Referring to FIG. 48, the lower link unit (300) of the antenna device (7) according to the seventh embodiment of the present invention may be formed with a slimmer left-right width compared to the lower link unit (300) of the antenna device (1) according to the first embodiment of the present invention described above.

[0224] The left-right distance between a pair of coupling portions 815 formed on the horizontal bracket 810 of the lower link unit 300 of the antenna device 7 according to the seventh embodiment of the present invention may be narrower than the left-right distance between a pair of coupling portions 615 (see FIG. 16) formed on the horizontal bracket 810 of the lower link unit 300 of the antenna device 1 according to the first embodiment of the present invention. In addition, the left-right distance between both sides coupled to both ends of the fifth joint bar 840 of the pole mounting unit 900 of the antenna device 7 according to the seventh embodiment of the present invention may be narrower than the left-right distance between both sides coupled to both ends of the fifth joint bar 840 of the pole mounting unit 900 of the antenna device 1 according to the first embodiment of the present invention.

[0225] Furthermore, the left and right widths of the pair of connecting portions (815) formed on the horizontal bracket (810) of the lower link unit (300) of the antenna device (7) according to the seventh embodiment of the present invention can be made slimmer than the left and right widths of the pair of connecting portions (815) formed on the horizontal bracket (810) of the lower link unit (300) of the antenna device (1) according to the first embodiment of the present invention described above.

[0226] Furthermore, the width of both sides of the pole mounting unit (900) of the antenna device (1) according to the first embodiment of the present invention, which are respectively coupled to both ends of the fifth joint bar (840), can be made slimmer than the width of both sides of the pole mounting unit (900) of the antenna device (7) according to the seventh embodiment of the present invention, which are respectively coupled to both ends of the fifth joint bar (840).

[0227] In addition, in the lower link unit 300 of the antenna device 1 according to the first embodiment of the present invention, a pair of vertical brackets 820, 830 are respectively connected to both ends of the horizontal bracket 810, and the pair of vertical brackets 820, 830 are fastened to the rear surface of the antenna unit 200 by bolts or screws. However, in the lower link unit 300 of the antenna device 7 according to the seventh embodiment of the present invention, the pair of vertical brackets 820, 830 are not respectively connected to both ends of the horizontal bracket 810, and both ends of the horizontal bracket 810 can be fastened to the rear surface of the antenna unit 200 by bolts or screws.

[0228] Furthermore, while the lower link unit 300 of the antenna device 1 according to the first embodiment described above has fifth clips (C5, see FIG. 16) installed at both ends of the fifth joint bar 840, the lower link unit 300 of the antenna device 1 according to the seventh embodiment of the present invention may have fifth snap rings SR5 installed at both ends of the fifth joint bar 840. The structure in which the fifth snap rings SR5 are installed at both ends of the fifth joint bar 840 from the lower link unit 300 of the antenna device 7 according to the seventh embodiment of the present invention can be the same as the structure in which the plurality of snap rings SR1, SR2, SR3, SR4 are installed at both ends of the plurality of joint bars 411, 412, 413, 414, respectively, as described with reference to FIGS. The fifth snap ring (SR5) can prevent the fifth joint bar (840) from coming off the pair of connecting portions (815) and the support mounting unit (900).

[0229] As described above, in the antenna device according to an embodiment of the present invention, the plurality of joint bars (411, 412, 413, 414) constituting the tilt drive unit (400) that tilts the antenna unit (200) are formed in the shape of hollow pipes, thereby reducing the weight of the tilt drive unit (400) while ensuring sufficient rigidity, thereby enabling smooth operation of the tilt drive unit (400).

[0230] In addition, in the antenna device according to an embodiment of the present invention, an operator can manually tilt the antenna unit (200) by rotating the manual tilt adjustment member (445), and the rotation shaft of the tilt motor (450) can be connected to the manual tilt adjustment member (445), so that the antenna unit (200) can be automatically tilted by operating the tilt motor (450).

[0231] In addition, in the antenna device according to an embodiment of the present invention, at least one bushing (425) is connected to each end of the plurality of tilt members (421, 422, 423, 424), and the plurality of joint bars (411, 412, 414) are rotatably connected to at least one bushing (425), so that the operation of the tilt drive unit (400) can be made smoother and the operating noise can be reduced.

[0232] In addition, in the antenna device according to an embodiment of the present invention, one side of at least one bushing (425) is cut to form a cutout portion (425A), and at least a portion of the opposite side of the cutout portion (425A) of at least one bushing (425) is welded to each of the tilt members (421, 422, 423, 424) in an arc shape. Therefore, when the tilt members (421, 422, 423, 424) rotate, the at least one bushing (425) moves elastically based on the cutout portion (425A), thereby enabling smooth rotation of the tilt members (421, 422, 423, 424).

[0233] In addition, in the antenna device according to an embodiment of the present invention, when the vertical length of the antenna unit 200 is relatively long, the antenna unit 200 can be installed on the support pole 100 through the lower link unit 300 and the tilt drive unit 400, and when the vertical length of the antenna unit 200 is relatively short, the antenna unit 200 can be installed on the support pole 100 through only the tilt drive unit 400, so that the antenna unit can be firmly connected to the support pole 100 against external forces such as wind.

[0234] In addition, in the antenna device according to an embodiment of the present invention, the tilt drive unit (400) can be directly installed on the support (100) and the antenna unit (200), respectively, without the existing support mounting unit (700) installed on the support (100) and the existing antenna mounting unit (600) installed on the antenna unit (200), so the antenna unit (200) can be tilted with a simple structure.

[0235] Those skilled in the art will understand that the present invention can be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, the above-described embodiments should be understood as illustrative in all respects and not limiting. The scope of the present invention is defined by the following claims, not by the above detailed description, and all modifications and variations derived from the meaning and scope of the claims and their equivalents should be construed as being within the scope of the present invention. [Industrial Applicability]

[0236] The present invention provides an antenna device in which the weight of a tilt drive unit that tilts an antenna unit is reduced while ensuring sufficient rigidity, thereby enabling smooth operation of the tilt drive unit. [Explanation of symbols]

[0237] 100: Support 200: Antenna unit 300: Lower link unit 400: Tilt drive unit 411: First joint bar 412: Second joint bar 413: 3rd joint bar 413A: 3rd through hole 414: 4th joint bar 414A: 7th through hole 415: Clip through hole 417: Snap ring through hole 421: First tilt member 421A: First-first tilt member 421B: 1st-2nd tilt member 421C: 1st connecting plate 421D: First connecting block 421E: First rotating connecting portion 421F: Second rotary joint 422: Second tilt member 422A: 2nd-1st tilt member 422B: 2nd-2nd tilt member 422C: Second connecting plate 422D: Second connecting block 422E: Third rotary joint 422F: Fourth rotary joint 423: Third tilt member 423A: Third-first tilt member 423B: 3-2 tilt member 423E: 5th rotation joint 423F: Sixth rotation joint 424: Fourth tilt member 424A: 4-1 tilt member 424B: 4-2 tilt member 424E: 7th rotating joint 424F: 8th rotating joint 425: Bush 425A: Incision 427: Second guide hole 430: Nut member 435: First coupling frame 435A: First through hole 435B: Second through hole 440: Screw bar 445: Manual tilt adjustment member 450: Tilt motor 460: Mounting bracket 465: Second connecting frame 465A: 4th through hole 465B: 5th through hole 465C: 6th through hole 466: 1st guide hole 467: Guide protrusion 600: Antenna mounting unit 700: Support mounting unit B1, B2, B3: Bolts C1, C2, C3, C4: Clips SR1, SR2, SR3, SR4: Snap rings

Claims

1. an antenna unit; and a tilt drive unit that has a plurality of tilt members that tilt the antenna unit when rotated and a plurality of joint bars that rotatably connect both ends of the plurality of tilt members, and connects the antenna unit to a support; The antenna device has a plurality of joint bars each formed in a hollow pipe shape.

2. At least one bushing is coupled to each of both ends of the plurality of tilt members, 2. The antenna apparatus according to claim 1, wherein each of the plurality of joint bars is rotatably coupled to the at least one bushing.

3. The antenna device according to claim 1 , wherein the plurality of tilt members are formed in the shape of a hollow pipe.

4. The antenna device according to claim 1 , further comprising a plurality of fastening members respectively connecting both ends of the plurality of joint bars to the plurality of tilt members.

5. The joint bars have clip through holes formed at both ends thereof, 5. The antenna device according to claim 4, wherein the plurality of fixing fastening members are formed of a plurality of clips that pass through the clip through holes formed at both ends of the plurality of joint bars and connect the plurality of joint bars to the plurality of tilt members, respectively.

6. Snap ring grooves are formed on the outer peripheral surfaces of both ends of the joint bars, 5. The antenna device according to claim 4, wherein the plurality of fixing fastening members are formed of a plurality of snap rings that are respectively coupled to the snap ring coupling grooves formed on outer peripheral surfaces of both end portions of the plurality of joint bars and that couple the plurality of joint bars to the plurality of tilt members, respectively.

7. 2. The antenna device of claim 1, wherein the plurality of joint bars include: a first joint bar; a second joint bar spaced forward from the first joint bar and arranged parallel to the first joint bar; a third joint bar spaced above or below the first joint bar and between the first joint bar and the second joint bar and arranged parallel to the first joint bar and the second joint bar; and a fourth joint bar spaced between the first joint bar and the second joint bar in a direction opposite to the third joint bar and arranged parallel to the first joint bar, the second joint bar, and the third joint bar.

8. The antenna unit further includes a pole mounting unit coupled to the pole, and an antenna mounting unit coupled to the antenna unit; 8. The antenna apparatus of claim 7, wherein the first joint bar is coupled to the mast mounting unit and the second joint bar is coupled to the antenna mounting unit.

9. 8. The antenna device of claim 7, wherein the plurality of tilt members include: a first tilt member having both ends rotatably coupled to the first joint bar and the third joint bar, respectively; a second tilt member having both ends rotatably coupled to the second joint bar and the third joint bar, respectively; a third tilt member having both ends rotatably coupled to the first joint bar and the fourth joint bar, respectively; and a fourth tilt member having both ends rotatably coupled to the second joint bar and the fourth joint bar, respectively.

10. the first tilt member includes a 1-1 tilt member, both ends of which are rotatably coupled to one end of the first joint bar and one end of the third joint bar, respectively, and a 1-2 tilt member, both ends of which are rotatably coupled to the other end of the first joint bar and the other end of the third joint bar, respectively; the second tilt member includes a 2-1 tilt member, both ends of which are rotatably coupled to one end of the second joint bar and one end of the third joint bar, respectively, and a 2-2 tilt member, both ends of which are rotatably coupled to the other end of the second joint bar and the other end of the third joint bar, respectively; the third tilt member includes a 3-1 tilt member, both ends of which are rotatably coupled to one end of the first joint bar and one end of the fourth joint bar, respectively, and a 3-2 tilt member, both ends of which are rotatably coupled to the other end of the first joint bar and the other end of the fourth joint bar, respectively; 10. The antenna device of claim 9, wherein the fourth tilt member includes a 4-1 tilt member whose both ends are rotatably coupled to one end of the second joint bar and one end of the fourth joint bar, respectively, and a 4-2 tilt member whose both ends are rotatably coupled to the other end of the second joint bar and the other end of the fourth joint bar, respectively.

11. 10. The antenna device of claim 9, wherein the tilt drive unit further includes: a nut member disposed on one of the third joint bar and the fourth joint bar; and a screw bar fastened perpendicularly to the nut member, the screw bar rotating the first tilt member, the second tilt member, the third tilt member, and the fourth tilt member to tilt the antenna unit.

12. 12. The antenna device of claim 11, wherein the nut member has a first pipe-shaped first coupling frame with an open interior, the first through-holes being formed on both sides thereof and second through-holes being formed on the top and bottom thereof and through which the screw bar passes, and one of the first through-holes is formed with a third through-hole through which the screw bar passes.

13. 12. The antenna device of claim 11, wherein the tilt drive unit further includes: a mounting bracket disposed on one of the third joint bar and the fourth joint bar; and a manual tilt adjustment member rotatably disposed on the mounting bracket and coupled to one end of the screw bar.

14. 14. The antenna device of claim 13, wherein the mounting bracket has a second coupling frame in the shape of a hollow pipe, the second coupling frame having fourth through-holes formed on both sides thereof through which the other one of the mounting brackets passes, a fifth through-hole formed on a lower side through which the screw bar passes, and a sixth through-hole formed on an upper side through which the manual tilt adjustment member passes, and the other mounting bracket has a seventh through-hole formed on a coupling portion of the screw bar and the manual tilt adjustment member passing through.

15. The antenna device according to claim 13, wherein the tilt drive unit further comprises: a tilt motor mounted on the mounting bracket, the tilt motor having a rotation shaft connected to the manual tilt adjustment member to rotate the screw bar.

16. The antenna device according to claim 1 , wherein the plurality of tilt members are formed in a plate shape.

17. The antenna device according to claim 1 , further comprising a plurality of bolts fastened to both ends of the plurality of joint bars, respectively, to connect the plurality of joint bars to the plurality of tilt members, respectively.

18. 2. The antenna device of claim 1, wherein the plurality of joint bars include: a first joint bar; a second joint bar spaced forward from the first joint bar and disposed parallel to the first joint bar; and a third joint bar spaced above or below the first joint bar and between the first joint bar and the second joint bar and disposed parallel to the first joint bar and the second joint bar.

19. 20. The antenna device of claim 18, further comprising: a mast mounting unit coupled to the mast; and an antenna mounting unit coupled to the antenna unit, wherein the first joint bar is coupled to the mast mounting unit and the second joint bar is coupled to the antenna mounting unit.

20. 19. The antenna device of claim 18, wherein the plurality of tilt members include: a first tilt member, both ends of which are rotatably coupled to the first joint bar and the third joint bar, respectively; and a second tilt member, both ends of which are rotatably coupled to the second joint bar and the third joint bar, respectively.

21. 21. The antenna device of claim 20, wherein the first tilt member includes a 1-1 tilt member, both ends of which are rotatably coupled to one end of the first joint bar and one end of the third joint bar, and a 1-2 tilt member, both ends of which are rotatably coupled to the other end of the first joint bar and the other end of the third joint bar, respectively; and the second tilt member includes a 2-1 tilt member, both ends of which are rotatably coupled to one end of the second joint bar and one end of the third joint bar, respectively, and a 2-2 tilt member, both ends of which are rotatably coupled to the other end of the second joint bar and the other end of the third joint bar, respectively.

22. 22. The antenna device of claim 21, wherein the tilt drive unit further includes a first connecting plate formed by bending the 1-1 tilt member and the 1-2 tilt member, and a second connecting plate formed by bending the 2-1 tilt member and the 2-2 tilt member.

23. 21. The antenna device of claim 20, wherein the tilt drive unit further includes: a nut member disposed on the third joint bar; and a screw bar fastened perpendicularly to the nut member, the screw bar rotating the first tilt member and the second tilt member to tilt the antenna unit when rotated.

24. 24. The antenna device of claim 23, wherein the tilt drive unit further includes: a mounting bracket having a first guide hole formed in a side portion thereof, the first guide hole guiding the third joint bar up and down when the screw bar is rotated; and a manual tilt adjustment member rotatably disposed on an upper surface of the mounting bracket and coupled to one end of the screw bar.

25. 25. The antenna device of claim 24, wherein second guide holes are formed in the first tilt member and the second tilt member, and a guide protrusion is formed on the side portion of the mounting bracket to move along the second guide hole and guide rotation of the first tilt member and the second tilt member when the third joint bar moves up and down along the first guide hole.

26. 25. The antenna device according to claim 24, wherein the tilt drive unit further includes a tilt motor mounted on the upper surface of the mounting bracket, the tilt motor having a rotation axis connected to the manual tilt adjustment member to rotate the screw bar.

27. 2. The antenna device according to claim 1, wherein the plurality of tilt members are formed in a block shape.

28. 2. The antenna device of claim 1, wherein the plurality of joint bars include: a first joint bar; a second joint bar spaced forward from the first joint bar and arranged parallel to the first joint bar; a third joint bar spaced above or below the first joint bar and between the first joint bar and the second joint bar and arranged parallel to the first joint bar and the second joint bar; and a fourth joint bar spaced between the first joint bar and the second joint bar in a direction opposite to the third joint bar and arranged parallel to the first joint bar, the second joint bar, and the third joint bar.

29. 29. The antenna device of claim 28, wherein the plurality of tilt members include: a first tilt member having both ends rotatably coupled to the first joint bar and the third joint bar, respectively; a second tilt member having both ends rotatably coupled to the second joint bar and the third joint bar, respectively; a third tilt member having both ends rotatably coupled to the first joint bar and the fourth joint bar, respectively; and a fourth tilt member having both ends rotatably coupled to the second joint bar and the fourth joint bar, respectively.

30. 30. The antenna device of claim 29, wherein a first coupling block to be coupled to the support is protruded from a rear surface of the first tilt member, and a second coupling block to be coupled to a rear surface of the antenna unit is protruded from a front surface of the second tilt member.

31. The antenna device according to claim 29 , wherein the lengths between both ends of the first tilt member, the second tilt member, the third tilt member, and the fourth tilt member are formed to be the same length.

32. 30. The antenna device of claim 29, wherein the lengths between both ends of the first tilt member and the second tilt member are formed to be the same first length, the lengths between both ends of the third tilt member and the fourth tilt member are formed to be the same second length, and the first length and the second length are formed to be different lengths.

33. The first tilt member has a first rotary coupling portion protruding therefrom, both ends of which are rotatably coupled to one end of the first joint bar and one end of the third joint bar, and a second rotary coupling portion protruding therefrom, both ends of which are rotatably coupled to the other end of the first joint bar and the other end of the third joint bar, and the second tilt member has a third rotary coupling portion protruding therefrom, both ends of which are rotatably coupled to one end of the second joint bar and one end of the third joint bar, and a fourth rotary coupling portion protruding therefrom, both ends of which are rotatably coupled to the other end of the second joint bar and the other end of the third joint bar, and the third tilt member has ...

30. The antenna device of claim 29, wherein the fourth tilt member has a fifth rotary coupling portion protruding therefrom, both ends of which are rotatably coupled to one end of the first joint bar and one end of the fourth joint bar, and a sixth rotary coupling portion protruding therefrom, both ends of which are rotatably coupled to the other end of the first joint bar and the other end of the fourth joint bar; and the fourth tilt member has a seventh rotary coupling portion protruding therefrom, both ends of which are rotatably coupled to one end of the second joint bar and one end of the fourth joint bar, and an eighth rotary coupling portion protruding therefrom, both ends of which are rotatably coupled to the other end of the second joint bar and the other end of the fourth joint bar.

34. 30. The antenna device of claim 29, wherein the tilt drive unit further includes: a nut member disposed on either the third joint bar or the fourth joint bar; and a screw bar fastened perpendicularly to the nut member, the screw bar rotating the first tilt member, the second tilt member, the third tilt member, and the fourth tilt member to tilt the antenna unit when rotated.

35. The antenna device according to claim 34, wherein the one of the screws passes through the nut member laterally, and the screw bar passes through the nut member and the one of the screws vertically.

36. 36. The antenna device according to claim 35, wherein the tilt drive unit further includes a tilt motor that rotates the screw bar, and another of the third joint bar and the fourth joint bar passes through the tilt motor laterally.

37. 10. The antenna device of claim 9, further comprising: a pole mounting unit coupled to the pole; and an antenna mounting unit coupled to the antenna unit, wherein a rear surface of the third tilt member is coupled to the pole mounting unit, and a front surface of the fourth tilt member is coupled to the antenna mounting unit.

38. 3. The antenna device according to claim 2, wherein one side of the at least one bushing is cut to form a cutout, and portions of the at least one bushing opposite the cutout are welded to the plurality of tilt members in a semicircular shape.

39. 9. The antenna device according to claim 8, wherein the antenna mounting unit has a hollow pipe-shaped coupling portion coupled to the second joint bar, and a triangular plate-shaped reinforcing plate welded to the coupling portion.

40. 11. The antenna device of claim 10, further comprising: a first connecting bar connecting a rear surface of the 1-1 tilt member to a rear surface of the 1-2 tilt member; a second connecting bar connecting a front surface of the 2-1 tilt member to a front surface of the 2-2 tilt member; a third connecting bar connecting a rear surface of the 3-1 tilt member to a rear surface of the 3-2 tilt member; and a fourth connecting bar connecting a front surface of the 4-1 tilt member to a front surface of the 4-2 tilt member.

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