KR102165727B1 - Directional antenna - Google Patents

Abstract

The present application relates to a directional antenna, wherein a directional antenna according to an embodiment of the present invention includes an antenna unit including a dipole antenna element for transmitting and receiving a transmission signal transmitted wirelessly; A reflector for reflecting a transmission signal transmitted and received by the antenna unit to give the transmission signal a directivity in a predetermined direction; And a feeding unit providing feeding to the antenna unit, wherein the dipole antenna element includes two conductors symmetrical to each other, and the lengths of the conductors are each having a wavelength corresponding to the center frequency of the antenna unit. It can be 1/4.

Description

Directional antenna

The present application relates to a directional antenna capable of obtaining a high radiation gain by concentrating in a specific direction and radiating a transmission signal.

With the development of communication devices, there is a trend that a plurality of antennas for transmitting and receiving various types of wireless signals are installed inside and outside a vehicle.

Here, various types of wireless signals include GPS (Global Positioning System) signals for utilizing a location-based system equipped with vehicles, FM and AM radio signals, DMB (Digital Multimedia Broadcast) signals for viewing digital broadcasting in the vehicle, It may include a Telematics Management Unit (TMU) signal for telematics communication, an XM satellite radio signal and a Sirius signal, a Digital Audio Broadcating (DAB) signal, and the like.

However, in the case of a built-in antenna that is mounted in a box type on the dashboard inside a vehicle, it is generally implemented as a monopole antenna or an inverted F antenna, and these antennas have a radiation type omni- directional). In this case, due to the influence of the metal vehicle body included in the vehicle, the amount of the radio signals emitted by the built-in antenna that escapes to the outside of the vehicle may be limited to a small fraction. Particularly, as the frequency of the transmission signal increases, the influence of the metal vehicle body becomes larger, so that the amount of radio signals that pass out of the vehicle body decreases further. That is, in the case of V2X (Vehicle to Everything) communication using a high-frequency radio signal, the reception sensitivity of the built-in antenna is very poor, and a problem such as that the wireless communication is not performed smoothly occurs.

The present application aims to provide a directional antenna capable of obtaining high radiation gain by focusing in a specific direction and radiating a transmission signal.

A directional antenna according to an embodiment of the present invention includes an antenna unit including a dipole antenna element for transmitting and receiving a transmission signal transmitted wirelessly; A reflector for reflecting a transmission signal transmitted and received by the antenna unit to give the transmission signal a directivity in a predetermined direction; And a feeding unit that provides feeding to the antenna unit. Here, the dipole antenna element includes two conductors symmetrical to each other, and the lengths of the conductors may be 1/4 of a wavelength corresponding to a center frequency of the antenna unit, respectively.

Here, the reflecting unit may include a first conductor plane; Second conductor plane; And a coupling portion that couples the first conductor plane and the second conductor plane at a predetermined coupling angle.

Here, the antenna unit is provided with the dipole antenna element at a preset designated position, the designated position being spaced apart from the coupling unit by a preset separation distance, and a distance to the first conductor plane and the second conductor plane. The distance of may be the same position.

Here, the reflective unit may impart directivity of the transmission signal in a traveling direction of a virtual line connecting the designated position in the coupling unit.

Here, the reflecting unit may reflect a transmission signal transmitted and received by the antenna unit and radiate the transmission signal so as to have the directivity within a range of the coupling angle.

Here, the power supply unit may be a wire extending from the coupling unit to the designated position, and fixing the position of the dipole antenna element to the designated position by coupling the dipole antenna element to one end.

Here, in the directional antenna according to an embodiment of the present invention, an angle formed by a horizontal line of a virtual line connecting the coupling unit and the designated position may be -10 to 30 degrees.

According to another embodiment of the present invention, the antenna unit may include a first antenna element and a second antenna element provided at positions symmetrical to each other with respect to the reflection unit.

Here, the reflecting unit may include: a first reflecting plate configured to reflect a first transmission signal transmitted from the first antenna element so that the first transmission signal has directivity in a first direction; And a second reflector configured to reflect a second transmission signal transmitted by the second antenna element so that the second transmission signal has directivity in a second direction.

Here, the power supply unit may include: a first power supply line extending from the first reflecting plate to support the first antenna element and supply power to the first antenna element; And a second feed line extending from the second reflector to support the second antenna element and supply power to the second antenna element.

Here, the power supply unit may further include a λ/4 converter (Quarter-wave transformer) that performs impedance matching for the first antenna element and the second antenna element.

Here, the λ/4 converter is a wire connecting between the first antenna element and the first feed line, the length of the wire being 1/4 of a wavelength corresponding to the center frequency of the first antenna element, and the wire A first conversion unit set according to a characteristic impedance of the first antenna element and a characteristic impedance of the first power supply line; And a wire connecting between the second antenna element and the second feed line, the length of the wire being 1/4 of a wavelength corresponding to the center frequency of the second antenna element, and the width of the wire being the second antenna. It may include a second conversion unit set according to the characteristic impedance of the device and the characteristic impedance of the second power supply line.

Here, the λ/4 conversion unit is a multi-stage conductor connecting the first antenna element and the first feed line, and the length of each end of the conductor is 1/ of a wavelength corresponding to the center frequency of the first antenna element. 4, wherein the width of each end of the conducting wire is set according to a characteristic impedance of the first antenna element and a characteristic impedance of the first power supply line; And a multi-stage conductor connecting the second antenna element and the second feed line, the length of each end of the conductor being 1/4 of a wavelength corresponding to the center frequency of the second antenna element, and each of the conductor lines The width of the end may include a second conversion unit set according to a characteristic impedance of the second antenna element and a characteristic impedance of the second power supply line.

A directional antenna according to another embodiment of the present invention includes: a reflector in which two conductor planes are coupled at a predetermined coupling angle; A dipole antenna element spaced apart from a tangent line generated by the coupling of the conductor planes by a predetermined spacing distance and provided at the same position with respect to each of the two conductor planes; And a feeding part extending from the reflector to fix a position of the dipole antenna element and providing power to the antenna element by a conductor at one end to which the dipole antenna element is coupled.

In addition, the solution to the above-described problem does not enumerate all the features of the present invention. Various features of the present invention and advantages and effects thereof may be understood in more detail with reference to the following specific embodiments.

Since the directional antenna according to an embodiment of the present invention can radiate a transmission signal by focusing in a specific direction, even when used as an internal antenna of a vehicle including a metal vehicle body, wireless communication can be performed smoothly, It can have high radiation gain.

According to the directional antenna according to an embodiment of the present invention, it is possible to impart directivity to a transmission signal radiated by the antenna by using a low-cost metal reflector.

According to an embodiment of the present invention, it is possible to satisfy omnidirectional radiation suitable for wireless communication such as a vehicle by utilizing a plurality of directional antennas.

1 is a schematic diagram showing a directional antenna according to an embodiment of the present invention.
2 is a schematic diagram showing a directional antenna according to another embodiment of the present invention.
3 is a schematic diagram showing a transmission signal radiation direction of a directional antenna according to an embodiment of the present invention.
4 is a schematic diagram showing a λ/4 converter according to an embodiment of the present invention.
5 is a schematic diagram showing an incident angle of a transmission signal to a vehicle equipped with a directional antenna according to an embodiment of the present invention.
6 is a schematic diagram showing transmission signal radiation of a vehicle including a directional antenna according to an embodiment of the present invention.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, in describing a preferred embodiment of the present invention in detail, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the same reference numerals are used throughout the drawings for portions having similar functions and functions.

In addition, throughout the specification, when a part is said to be'connected' to another part, it is not only'directly connected', but also'indirectly connected' with another element in the middle. Include. In addition, "including" a certain component means that other components may be further included rather than excluding other components unless specifically stated to the contrary. In addition, terms such as "... unit" and "module" described in the specification mean units that process at least one function or operation, which may be implemented as hardware or software, or as a combination of hardware and software. .

1 is a schematic diagram showing a directional antenna according to an embodiment of the present invention.

Referring to FIG. 1, a directional antenna 100 according to an embodiment of the present invention may include an antenna unit 10, a reflective unit 20, and a power feeding unit 30.

Hereinafter, a directional antenna according to an embodiment of the present invention will be described with reference to FIG. 1.

The antenna unit 10 may transmit or receive a transmission signal transmitted wirelessly. Here, there may be various transmission signals transmitted or received by the antenna unit 10 such as AM, FM radio signals, 3G signals, LTE (Long Term Evolution) signals, V2X (Vehicle to Everything) signals, etc., but in this embodiment An example of receiving a V2X signal in the 5.8GHz band will be described.

Specifically, as shown in FIG. 1, the antenna unit 10 may be a dipole antenna element, and the dipole antenna may include two conductors 10a and 10b symmetrical to each other. Here, the length of each conductor is λ/4, and λ corresponds to the length of a wavelength corresponding to the center frequency of the operating frequency band of the antenna unit 10. Therefore, in the case of a dipole antenna receiving a V2X signal of 5.8 GHz, since the center frequency is 5.8 GHz, λ = c/f = (3*10^8)/(5.8*10^9) = 51.7mm, and λ/ 4 = 51.7/4 = 12.93mm = 1.29cm. That is, the two conductive wires 10a and 10b included in the dipole antenna element may be designed to have a length of 1.29 cm, respectively. Here, c is the speed of light and f is the center frequency.

In the case of a dipole antenna element, since it generally has omni-directional characteristics, the dipole antenna element can radiate a transmission signal uniformly in all directions within a three-dimensional space. However, when the dipole antenna element is used as an internal antenna of a vehicle, the amount of a transmission signal that passes out of the vehicle body may be limited to a very small extent due to the influence of a metal vehicle body included in the vehicle. In particular, as the frequency of the transmission signal transmitted and received by the dipole antenna element increases, the influence of the metal vehicle body increases, so that the amount of transmission signals exiting the vehicle body decreases further. Accordingly, in the case of a V2X signal in the 5.8 GHz band using a high-frequency transmission signal, a problem such as a very bad reception sensitivity in the vehicle's built-in antenna may occur.

However, in the case of the directional antenna according to an embodiment of the present invention, since the dipole antenna element may have directivity, the above-described problem can be solved. That is, the dipole antenna element having directivity can concentrate and transmit a transmission signal in a specific direction, and in this case, the amount of the transmission signal exiting the vehicle body through a specific direction increases. Therefore, a high radiation gain can be obtained in a specific direction, and through this, it is possible to improve the reception sensitivity of the dipole antenna element despite the influence of the metal vehicle body.

Specifically, the directional antenna according to an embodiment of the present invention includes a reflecting unit 20 to reflect a transmission signal transmitted or received by the antenna unit 10, and through this Directivity in a set direction can be given. Here, the reflective part 20 may include a first conductor plane 20a and a second conductor plane 20b, as shown in FIG. 1, and the first conductor plane 20a and the second conductor plane (20b) may include a coupling portion (20c) that is coupled to a predetermined coupling angle. The transmission signal radiated from the antenna unit 10 may be reflected from the surface of the first conductor plane 20a or the second conductor plane 20b, and the reflected transmission signal may be reflected by Snell’s law. It may radiate while having a certain directivity within a range of a coupling angle between the first conductor plane 20a and the second conductor plane 20b.

Here, the direction of directivity of the transmission signal may be determined by a physical arrangement and shape between the antenna unit 10 and the reflective unit 20. Specifically, the antenna unit 10 may be provided at a preset designated position with respect to the reflective unit 20, and the designated position is as much as a preset separation distance (d) from the coupling unit 20c of the reflective unit 20. It is spaced apart, and the distance to the first conductor plane 20a and the distance to the second conductor plane 20b may be the same position. Here, in the case of a V2X signal of 5.8 GHz, the separation distance (d) may be set to 5 cm, the horizontal length of the first conductor plane 20a and the second conductor plane 20b is 19.3 cm, and the first conductor plane ( The maximum height between 20a) and the second conductor plane 20b may be 25.8 cm, and the coupling angle x may be 60 degrees. In this case, the reflecting unit 20 may reflect the transmission signal transmitted and received by the antenna unit 10 and radiate the transmission signal so as to have directivity within the range of the coupling angle (x). In particular, the coupling unit 20c Directivity of the transmission signal can be given in the direction of travel of the virtual line connecting the and the designated location.

The feeding unit 30 may provide feeding to the antenna unit 10. That is, the signal input to the antenna unit 10 through the power supply unit 30 can be converted into a wireless transmission signal and transmitted to the outside, and the external transmission signal input through the antenna unit 10 is a power supply unit ( The directional antenna 100 may be input through 30). Here, the power supply unit 30 may be a wire extending from the coupling unit 20c of the reflecting unit 20 to a designated position, as shown in FIG. 1, and the antenna unit 10 is coupled to one end, and the antenna It is possible to perform a function of fixing the unit 10 to a preset designated position.

When the gain of the transmission signal radiated by the directional antenna according to an embodiment of the present invention is measured, a graph as shown in FIG. 3 can be obtained. Here, FIG. 3 shows the gain of the transmission signal that can be obtained when the coupling part 20c of the reflecting part 20 is located in the center and the antenna part 10 is facing a direction of 90 degrees. Referring to FIG. 3, it can be seen that the directional antenna radiates a transmission signal in various directions, but in particular radiates a transmission signal with the highest gain in the range of 60 to 120 degrees. This coincides with the direction of directivity set by the reflective unit 20 and the like, and it can be seen from FIG. 3 that the directional antenna according to an embodiment of the present invention has directivity.

Meanwhile, as shown in FIG. 2, the directional antenna according to another embodiment of the present invention includes a plurality of antenna elements 11 and 12 in the antenna unit 10, and a plurality of reflectors in the reflecting unit 20 It includes (21, 22), it may include a plurality of feed lines (31, 32) in the feeding unit (30).

Hereinafter, a directional antenna according to another embodiment of the present invention will be described with reference to FIG. 2.

As shown in FIG. 2, the directional antenna according to another embodiment of the present invention may include a plurality of antenna elements 11 and 12. That is, the antenna unit 10 may include a first antenna element 11 and a second antenna element 12 provided at positions symmetrical to each other with respect to the reflective unit 20. Each of the first antenna element 11 and the second antenna element 12 may be a dipole antenna element. When receiving a V2X signal of 5.8 GHz, each of the first antenna element 11 and the second antenna element 12 may include two conductors each having a length of 1.29 cm.

The reflector 20 may include a first reflector 21 and a second reflector 22, as shown in FIG. 2, and the first reflector 21 and the second reflector 22 are combined The parts may be arranged to face each other. Here, the first reflector 21 may reflect the first transmission signal transmitted by the first antenna element 11, and may allow the first transmission signal to have directivity in a first direction. Here, the first direction may be a traveling direction from the coupling portion of the first reflector 21 to the first antenna element 11. In addition, the second reflector 22 may reflect a second transmission signal transmitted by the second antenna element 12 and may cause the second transmission signal to have directivity in a second direction. Here, the second direction may be a moving direction from the coupling portion of the second reflector 22 to the second antenna element 12, and the first direction and the second direction may be opposite directions symmetrical to each other.

As shown in FIG. 2, the power supply unit 30 may include a first power supply line 31 and a second power supply line 32, and the first power supply line 31 is attached to the first antenna element 11. It is connected to provide power to the first antenna element 11, and the second power supply line 32 is connected to the second antenna element 12 to provide power to the second antenna element 12. Here, the first feed line 31 extends from the first reflector 21 to support the first antenna element 11, and the first antenna element 11 is attached to the first reflector 21. It can be fixed so that it is located at the set designated position. Likewise, the second feed line 32 extends from the second reflector 22 to support the second antenna element 12, and the second antenna element 12 is set with respect to the second reflector 22. It can be fixed to be located in a designated position.

Here, the directional antenna according to another embodiment of the present invention shown in Fig. 2 is provided with two directional antennas of Fig. 1, and the two directional antennas 100a and 100b face each other in opposite directions. I can.

Meanwhile, as shown in FIG. 4, the power supply unit 30 may further include a λ/4 conversion unit 33. The λ/4 converter 33 performs impedance matching for the first antenna element 11 and the second antenna element 12, and supplies the same power to the first antenna element 11 and the second antenna element 12. And transmit/receive a transmission signal having the same phase to the first antenna element 11 and the second antenna element 12.

를 이용하여 제1 변환부(33a)의 특성 임피던스를 계산할 수 있으며, 상기 계산된 특성 임피던스에 따라 상기 도선의 너비를 결정할 수 있다. 여기서, Z_t1는 제1 변환부(33a)의 특성 임피던스, Z₁₁은 제1 안테나소자(11)의 특성 임피던스, Z₁₂는 제1 급전라인(31)의 특성임피던스에 해당한다. The λ/4 conversion unit 33 may include a first conversion unit 33a and a second conversion unit 33b. The first conversion unit 33a may be a conductive wire connected between the first antenna element 11 and the first feed line 31, and the length of the conductive wire is the center frequency of the first antenna element 11 It is 1/4 of the wavelength corresponding to, and the width of the conductor may be set according to a characteristic impedance of the first antenna element 11 and a characteristic impedance of the first power supply line 31. here,

The characteristic impedance of the first conversion unit 33a may be calculated using, and the width of the conducting wire may be determined according to the calculated characteristic impedance. Here, Z _t1 is a characteristic impedance of the first conversion unit 33a, Z ₁₁ is a characteristic impedance of the first antenna element 11, and Z ₁₂ is a characteristic impedance of the first feed line 31.

를 이용하여 제2 변환부(33b)의 특성 임피던스를 계산할 수 있으며, 상기 계산된 특성 임피던스에 따라 상기 도선의 너비를 결정할 수 있다. 여기서, Z_t2는 제2 변환부(33b)의 특성 임피던스, Z₂₁은 제2 안테나소자(12)의 특성 임피던스, Z₂₂는 제2 급전라인(32)의 특성임피던스에 해당한다. Likewise, the second conversion unit 33b may be a wire connected to the second antenna element 12 and the second feed line 32, and the length of the wire is equal to the center frequency of the second antenna element 12. It is 1/4 of the corresponding wavelength, and the width of the conducting wire may be set to the characteristic impedance of the second antenna element 12 and the characteristic impedance of the second feed line 32. In the same way

The characteristic impedance of the second conversion unit 33b may be calculated using, and the width of the conducting wire may be determined according to the calculated characteristic impedance. Here, Z _t2 corresponds to the characteristic impedance of the second conversion unit 33b, Z ₂₁ corresponds to the characteristic impedance of the second antenna element 12, and Z ₂₂ corresponds to the characteristic impedance of the second feed line 32.

Here, the λ/4 conversion unit 33 may implement each of the first conversion unit 33a and the second conversion unit 33b in multiple stages, as shown in FIG. 4. That is, the first conversion unit 33a and the second conversion unit 33b may be implemented as a multisection transformer, where each stage may have a length of λ/4, and the width of each stage is each antenna It may be set according to the characteristic impedance of the elements 11 and 12 and the characteristic impedance of the first and second power supply lines 31 and 32.

Additionally, as shown in FIG. 5, transmission signals incident into the vehicle c may be strongly incident in an angular range of 0 to 20 degrees. Accordingly, in the case of installing the directional antenna according to an exemplary embodiment of the present invention, the arrangement angle may be set in consideration of an angular range of 0 to 20 degrees of a transmission signal incident on the vehicle c. Here, the arrangement angle may be an angle formed by a virtual line connecting the coupling part 20c included in the reflective part 20 and a designated position where the antenna part 10 is located with the horizontal line. Therefore, by adjusting the arrangement angle, the angular range of 0 to 20 degrees can be included within the directional range of the directional antenna according to an embodiment of the present invention, and in this case, the reception sensitivity for the directional antenna can be improved. have. For example, by setting the angle formed by the horizontal line of the virtual line connecting the coupling part 20c and the designated location in a range of -10 to 30 degrees, so that the range of directivity of the directional antenna is included within the range of 0 to 20 degrees. can do.

On the other hand, as shown in Fig. 6A, conventionally, it has been difficult to transmit a transmission signal radiated by the internal antenna of the vehicle c outside the vehicle body due to the influence of a metal vehicle body or the like. However, in the case of using the directional antenna according to an embodiment of the present invention as shown in Fig. 6(b), a relatively large number of transmission signals can be transmitted to the outside of the vehicle (c). It is also possible to transmit and receive through a vehicle built-in antenna.

Here, FIG. 6(b) shows a case including two directional antennas having directivity to the front and rear of the vehicle c. In this way, when the directional antennas are combined, it is omnidirectional with respect to the periphery of the vehicle c. It is also possible to allow radiation to occur. Depending on the embodiment, it is possible to radiate a transmission signal in various directions by combining two or more directional antennas.

The present invention is not limited by the above-described embodiments and the accompanying drawings. It will be apparent to those of ordinary skill in the art to which the present invention pertains, that components according to the present invention can be substituted, modified, and changed within the scope of the technical spirit of the present invention.

10: antenna unit 11: first antenna element
12: second antenna element 20: reflector
21: first reflector 22: second reflector
30: power supply unit 31: first power supply line
32: second feed line 33: λ/4 conversion unit

Claims (14)

An antenna unit including a dipole antenna element for transmitting and receiving a transmission signal transmitted wirelessly;
A reflector for reflecting a transmission signal transmitted and received by the antenna unit to give the transmission signal a directivity in a predetermined direction; And
As including a feeding unit for providing feeding (feeding) to the antenna unit,
The dipole antenna element
It includes two conductors symmetrical to each other, and the lengths of the conductors are each 1/4 of a wavelength corresponding to the center frequency of the antenna unit,
The reflector
First conductor plane;
Second conductor plane; And
A directional antenna comprising a coupling portion for coupling the first conductor plane and the second conductor plane to a predetermined coupling angle.
delete The method of claim 1, wherein the antenna unit
The dipole antenna element is provided at a preset designated position, wherein the designated position is spaced apart from the coupling unit by a preset distance, and the distance to the first conductor plane and the distance to the second conductor plane are the same. Directional antenna.
The method of claim 3, wherein the reflective unit
A directional antenna for imparting directivity of the transmission signal in a traveling direction of a virtual line connecting the designated position in the coupling unit.
The method of claim 4, wherein the reflection part
A directional antenna that reflects a transmission signal transmitted and received by the antenna unit and radiates the transmission signal so as to have the directionality within a range of the coupling angle.
The method of claim 3, wherein the power supply unit
A directional antenna that extends from the coupling portion to the designated position, and is a conducting wire for fixing the position of the dipole antenna element to the designated position by coupling the dipole antenna element to one end.
The method of claim 3,
The directional antenna formed by a virtual line connecting the coupling part and the designated position with a horizontal line is -10 to 30 degrees.
The method of claim 1, wherein the antenna unit
A directional antenna including a first antenna element and a second antenna element provided at positions symmetrical to each other with respect to the reflector.
The method of claim 8, wherein the reflector
A first reflector reflecting a first transmission signal transmitted by the first antenna element so that the first transmission signal has directivity in a first direction; And
A directional antenna comprising a second reflector for reflecting a second transmission signal transmitted by the second antenna element so that the second transmission signal has directivity in a second direction.
The method of claim 9, wherein the power supply unit
A first feed line extending from the first reflector to support the first antenna element and supply power to the first antenna element; And
A directional antenna including a second feed line extending from the second reflector to support the second antenna element and providing power to the second antenna element.
The method of claim 10, wherein the power supply unit
A directional antenna further comprising a λ/4 converter for performing impedance matching for the first antenna element and the second antenna element.
The method of claim 11, wherein the λ/4 conversion unit
A conductor connecting the first antenna element and the first feed line, and the length of the conductor is 1/4 of the wavelength corresponding to the center frequency of the first antenna element, and the width of the conductor is the first antenna element A first conversion unit set according to a characteristic impedance of and a characteristic impedance of the first power supply line; And
A conductive line connecting between the second antenna element and a second feed line, the length of the conductive line being 1/4 of a wavelength corresponding to the center frequency of the second antenna element, and the width of the conductive line being the second antenna element The directional antenna comprising a second conversion unit set according to the characteristic impedance of and the characteristic impedance of the second feed line.
The method of claim 11, wherein the λ/4 conversion unit
A multi-stage conductor connecting the first antenna element and the first feed line, the length of each end of the conductor is 1/4 of a wavelength corresponding to the center frequency of the first antenna element, and each end of the conductor A first conversion unit set according to a characteristic impedance of the first antenna element and a characteristic impedance of the first power supply line; And
A multi-stage conductor connecting the second antenna element and the second feed line, the length of each end of the conductor is 1/4 of a wavelength corresponding to the center frequency of the second antenna element, and each end of the conductor A directional antenna including a second conversion unit set according to a characteristic impedance of the second antenna element and a characteristic impedance of the second feed line.
A reflector in which the two conductor planes are coupled at a predetermined coupling angle;
A dipole antenna element spaced apart from a tangent line generated by the coupling of the conductor planes by a predetermined spacing distance and provided at the same position with respect to each of the two conductor planes; And
A directional antenna including a feeder at one end to which the dipole antenna element is coupled, and extends from the reflector to fix a position of the dipole antenna element and provide power to the antenna element.

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