KR101693393B1 - Folded log periodic antenna in communication system - Google Patents

Abstract

In the folded logarithmic periodic antenna in the communication system, the first antenna element and the second pole element are arranged on only one side of the first central conductive line, and the first antenna element and the second pole element are arranged on only one side of the first central conductive line. A first log periodic antenna element including a second antenna sub-element; The second antenna element including a third antenna sub-element in which third pole elements are arranged on only one side of the third central conductive line and a fourth antenna sub-element in which fourth pole elements are arranged on only one side of the fourth central conductive line, ; A first coupling subunit for coupling and separating the first antenna subunit and the second antenna subunit; And a second coupling subassembly for coupling and separating the third and fourth antenna subassemblies.

Description

[0001] The present invention relates to a folded log periodic antenna in a communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system, and more particularly, to a folded log periodic antenna that reduces its size while maintaining antenna performance.

Generally, a log periodic antenna (LP antenna) is widely used as an antenna for TV reception or communication with a wide band characteristic and a suitable gain. In particular, recently, the utilization of the logarithmic periodic antennas is increasing due to the broadening of the communication service.

), 간격 정수(

), 및 특정 대역의 단일 다이폴 안테나 길이(

/2) 등에 따라 특성이 변화하게 된다. 여기서, 대수주기의 비와 간격 정수를 줄이면 붐(boom)의 길이가 짧아져서 안테나 크기는 줄어들지만 안테나 이득이 감소될 수 있다. 이와 반대로, 대수주기의 비와 간격 정수를 늘이면 안테나 이득은 증가하지만 안테나 크기가 늘어날 수 있다. 또한, 특정 대역에서 동작시킬 때, 각 다이폴 소자의 길이는 해당 주파수 대역의 파장과 관련되므로 길이의 변경에는 한계가 존재한다. 하지만, 최근의 무선 통신 시스템은 소형화하고 있는 추세에 있다.Among the various types of log periodic antennas, a logarithmic periodic dipole antenna is generally used in which planar or conductive dipoles are arranged. The logarithmic periodic dipole antenna has a series of dipole radiating elements in series, and the logarithmic period ratio

), Interval constant (

), And a single dipole length of a specific band (

/ 2) and the like. Here, reducing the logarithmic period ratio and spacing constant reduces the length of the boom so that the antenna size is reduced but the antenna gain can be reduced. Conversely, increasing the ratio of the logarithmic period and the spacing constant increases the antenna gain but can increase the antenna size. Further, when operating in a specific band, since the length of each dipole element is related to the wavelength of the corresponding frequency band, there is a limitation in changing the length. However, recent wireless communication systems are becoming smaller.

Thus, in order to realize miniaturization of the antenna, the dipole element of the logarithmic periodic dipole antenna may be replaced with a loop element, or the end portion of the radiating element may be bent. It is also possible to use a method of transforming into a size-reduced dipole or a foreshortened dipole. However, these methods may be difficult to fabricate or assemble due to changes in the length of the antenna element due to changes in the shape of the element. On the other hand, there is a problem that a significant size reduction effect of the logarithmic periodic dipole antenna can not be obtained.

Therefore, there is a need for a logarithmic periodic antenna capable of maintaining the antenna performance while reducing the overall antenna size.

It is therefore an object of the present invention to provide a logarithmic periodic antenna capable of maintaining antenna performance while reducing the overall antenna size in a communication system.

According to another aspect of the present invention, there is provided a logarithmic periodic antenna apparatus in a communication system, the apparatus comprising: a plurality of first pole elements arranged on one side of a first central conductive line, A first logarithmic periodic antenna element including a first antenna element and a second antenna element with second pole elements arranged on only one side of the antenna element and the second central conductive line; The second antenna element including a third antenna sub-element in which third pole elements are arranged on only one side of the third central conductive line and a fourth antenna sub-element in which fourth pole elements are arranged on only one side of the fourth central conductive line, ; A first coupling subunit for coupling and separating the first antenna subunit and the second antenna subunit; And a second coupling subassembly for coupling and separating the third and fourth antenna subassemblies.

The logarithmic periodic antenna according to the present invention has an effect that the antenna performance can be maintained while reducing the antenna length by making a part of the pawl elements have a folding structure.

1 is a perspective view of a general logarithmic periodic dipole antenna,
FIG. 2 is a perspective view of a folded logarithmic periodic antenna according to an embodiment of the present invention,
FIG. 3 is a perspective view of a folded log-periodic antenna according to an embodiment of the present invention,
FIG. 4 is a perspective view of a folded log-periodic antenna according to another embodiment of the present invention,
Fig. 5 is a plan view of the folded log-periodic antenna shown in Figs. 2 and 3,
FIG. 6 is an exploded perspective view of the folded logarithmic periodic antenna shown in FIG. 4,
FIG. 7 is an enlarged view exemplarily showing a coupling state of the first log periodic antenna element shown in FIG. 6,
FIG. 8 is a perspective view exemplarily illustrating a folded logarithmic periodic antenna shown in FIG. 3,
FIG. 9 is a perspective view for explaining a state in which the folded logarithmic periodic antenna shown in FIG. 4 is folded,
FIG. 10 is an exploded perspective view illustrating the folded logarithmic periodic antenna shown in FIG. 9 by way of example,
Fig. 11 is an enlarged view exemplarily showing a coupling state of the first log periodic antenna element shown in Fig. 10,
Fig. 12 is a perspective view exemplarily showing another folded shape of the folded log-periodic antenna shown in Fig. 8,
13 is a sectional view for explaining another folded shape of the folded log-periodic antenna shown in Fig. 12, Fig.
FIG. 14 is an exemplary view showing an expanded form of the folded log periodic antenna shown in FIG. 12. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation according to the present invention will be described, and the description of other parts will be omitted so as not to obscure the gist of the present invention.

The present invention proposes a logarithmic periodic antenna having an antenna element of a folding structure. Here, the plurality of pole elements constituting the log periodic antenna are symmetrical in the vertical direction with respect to the transmission lines, and are positioned so as not to face each other between the plurality of pole elements. However, the shape of the logarithmic periodic antenna is described as an example, and can be extended to other logarithmic periodic antennas having different structures or different shapes.

1 is a perspective view of a general logarithmic periodic dipole antenna.

Referring to FIG. 1, the logarithmic periodic dipole antenna 10 includes a first log periodic antenna element 110 and a second log periodic antenna element 120.

The first log periodic antenna element 110 includes a plurality of pole elements (or radiating elements) 111, a first transmission line 112, and a power supply terminal 113. Here, the plurality of pole elements 111 are positioned on the first transmission line 112 based on predetermined intervals. The plurality of pole elements 111 are alternately arranged in the vertical direction (+90 degrees and -90 degrees directions) with respect to the first transmission line 112. The first feed terminal 113 is positioned to apply a current to one end of the first transmission line 112.

The second log periodic antenna element 120 includes a plurality of pole elements (or radiating elements) 121, a second transmission line 122, and a power supply terminal 123. Here, the plurality of pole elements 121 are positioned on the second transmission line 122 at preset intervals. The plurality of pole elements 121 are alternately arranged in the vertical direction (+90 degrees and -90 degrees directions) with respect to the second transmission line 122. The second feeding terminal 123 is positioned to apply a current to one end of the second transmission line 122.

The first transmission line 112 and the second transmission line 122 are parallel to each other and are connected to the first transmission line 112 and the second transmission line 112, The second pole elements 121 connected to the second pole elements 122 are arranged at positions not facing each other.

At this time, the logarithmic periodic dipole antenna 10 operates as an antenna when a current is applied to the first feeding terminal 113 and the second feeding terminal 123 through a coaxial cable or the like.

2 is a perspective view of a folded log-periodic antenna according to an embodiment of the present invention.

Referring to FIG. 2, the folded log periodic antenna 20 includes a first log periodic antenna element 200 and the second log periodic antenna element 300. Here, the first log periodic antenna element 200 includes a first antenna element 210 and a second antenna element 220. The second log periodic antenna element 300 includes a third antenna element 310 and a fourth antenna element 320.

The first log periodic antenna element 200 can be rearranged and coupled by the first coupling auxiliary portion 401 and the second log periodic antenna element 300 can be relocated and coupled by the second coupling auxiliary portion 402, Can be combined.

The first coupling sub-part 401 and the second coupling sub-part 402 shown in the drawing may include one fixed rod and three fixed magnets. Thus, the folded log periodic antenna 20 shown in FIG. 2 includes six fixed rods and twelve fixed magnets. However, the number of the fixed rods and the fixed magnets is not limited to the number shown in the drawings, and may be implemented in various numbers in consideration of antenna size, structure, and assembly convenience.

Here, the first log periodic antenna element 200 and the second log periodic antenna element 300 are arranged in a direction of one of a vertical direction (+90 degrees and -90 degrees directions) with respect to a transmission line of the pawl elements And the antenna sub-elements 210, 220, 310, and 320 including only the corresponding pole elements. For example, the first antenna element 210 and the third antenna element 310 may include only pawl elements in the upward direction (+90 degrees) with respect to the transmission line, The second antenna element 220 and the fourth antenna element 320 may include only the pole elements in the downward direction (-90 degree direction) with respect to the transmission line.

The folding logarithmic periodic antenna 20 has a foldable structure to form the antenna sub-elements 210, 220, 310 and 320 constituting the logarithmic periodic antenna element, so that the antenna sub-elements 210, 220, 310, 320). ≪ / RTI >

The folded logarithmic periodic antenna 20 proposed by the present invention is composed of a plurality of antenna sub-elements including pawl elements, and has a folding structure, thereby maintaining the antenna performance while reducing the length of the antenna.

3 is a perspective view of a folded log-periodic antenna according to an embodiment of the present invention.

Referring to FIG. 3, the folded log periodic antenna 20 includes the first log periodic antenna element 200 and the second log periodic antenna element 300. Here, the logarithmic periodic antenna 20 of FIG. 3 is shown for convenience of explanation and corresponds to the logarithmic periodic antenna 20 of FIG.

First, the first log periodic antenna element 200 will be described as follows.

The first log periodic antenna element 200 includes the first antenna element 210 and the second antenna element 220.

The first antenna element 210 includes a plurality of pole elements 211 and a first central conductive line 212. Each of the plurality of pole elements 211 is arranged on the first central conductive line 212 at predetermined intervals. At this time, the plurality of pole elements 211 are arranged on only one side of the first central conductive line 212 (for example, upward direction (or +90 degree direction)). The plurality of pole elements 211 are connected to the first central conductive line 212.

The second antenna sub element 220 includes a plurality of pole elements 221 and a second central conductive line 222. Each of the plurality of pole elements 221 is arranged on the second central conductive line 222 at predetermined intervals. At this time, the plurality of pole elements 221 are arranged on only one side of the second central conductive line 222 (for example, in the downward direction (or -90 degree direction)). The second central conductive line 222 connects the plurality of pole elements 221.

Next, the second log periodic antenna element 300 will be described as follows.

The second log periodic antenna element 300 includes the third antenna element 310 and the fourth antenna element 320.

The third antenna sub-element 310 includes the plurality of pole elements 311 and a third central conductive line 312. Each of the plurality of pole elements 311 is arranged on the third central conductive line 312 at predetermined intervals. At this time, the plurality of pole elements 311 are arranged on only one side of the third central conductive line 312 (for example, upward direction (or +90 degree direction)). The third central conductive line 312 connects the plurality of pole elements 311.

The fourth antenna subassembly 320 includes a plurality of pole elements 321 and a fourth central conductive line 322. Each of the plurality of pole elements 321 is arranged on the fourth central conductive line 322 at predetermined intervals. At this time, the plurality of pole elements 321 are arranged only on one side (for example, downward direction (or -90 degree direction)) of the fourth central conductive line 322. The plurality of pole elements 321 are connected to the fourth central conductive line 322.

The first log periodic antenna element 110 of the logarithmic periodic dipole antenna 10 illustrated in FIG. 1 includes the first transmission line 112, the plurality of pole elements (or radiating elements) 111 And the power feeding terminal 113 are formed on the same plane. The second transmission line 122, the plurality of pole elements (or radiating elements) 121, and the power supply terminal 123 of the second log periodic antenna element 120 are formed on the same plane .

However, according to the folded logarithmic periodic antenna 20 of the present invention, the first antenna element 210 and the second antenna element 220 of the first log periodic antenna element 200 are different from each other. And the third antenna sub element 310 and the fourth antenna sub element 320 of the second log periodic antenna element 300 are formed on two different planes. Therefore, in the folded logarithmic periodic antenna 20 of the present invention, the antenna sub-elements 210, 220, 310, and 320 are formed on four different planes, respectively.

The first coupling assisting portion 401 includes a first fixed bar 410, a first fixed magnet 421, a second fixed magnet 422, and a third fixed magnet (not shown). Here, the third fixed magnet is located on the first antenna element 210 in the drawing, which will be described with reference to FIG. 6 and the like. At this time, the first coupling sub-unit 401 connects the first antenna sub-element 210 and the second antenna sub-element 220.

The second coupling auxiliary portion 402 includes a second fixed bar, a fourth fixed magnet, and a fifth fixed magnet. The second coupling sub-unit 402 connects the third antenna sub-element 310 and the fourth antenna sub-element 320.

Each of the fixed rods and the fixed magnets constituting the first coupling auxiliary portion 401 and the second coupling auxiliary portion 402 has been described as an example for convenience of explanation and the antenna sub elements 210, 220, 310, A plurality can be used for the coupling between the two.

The first and second antenna subelements 210 and 220 are connected by the first coupling subassembly 401 and the third antenna subelement 310 and the fourth antenna subelement 220 are connected to each other, The element 320 is connected by the second coupling sub-part 402. Thus, it can serve as the logarithmic periodic dipole antenna 10 of FIG. 1 in which the first log periodic antenna element 200 and the second log periodic antenna element 300 are present in a pair of single layers .

The power feeding terminal of the logarithmic periodic antenna of the present invention is connected to the antenna sub-elements 210, 220, 310, and 320 so that current is applied to transmission lines of the antenna sub-elements 210, 220, It can be located at each end. As such, the folded logarithmic periodic antenna structures described below can be connected in a similar fashion as the feed terminals are connected.

4 is a perspective view of a folded log-periodic antenna according to another embodiment of the present invention.

Referring to FIG. 4, the folded log periodic antenna 30 includes the first log periodic antenna element 200 and the second log periodic antenna element 300. Here, the folded logarithmic periodic antenna 30 of FIG. 4 corresponds to the same identifier for a similar structure to the folded logarithmic periodic antenna 20 of FIG. 3 for convenience of explanation.

The first log periodic antenna element 200 includes a first antenna element 210A, a second antenna element 220 and a first transmission line 510.

The second log periodic antenna element 300 includes a third antenna element 310A, a fourth antenna element 320 and a second transmission line 520. [

The detailed structure of the first log periodic antenna element 200 and the second log periodic antenna element 300 will be described with reference to FIG.

The folded logarithmic periodic antenna 30 further includes a first transmission line 510 and a second transmission line 520 in comparison with the folded logarithmic periodic antenna 20 of FIG. Here, the first transmission line 510 is coupled to the first antenna element 210A on one side, and the third antenna element 310A is coupled to one side of the second transmission line.

3 is divided into two layers, that is, the first antenna element 210A and the first transmission line 510, and the third antenna element 310, Is separated into the two layers of the third antenna element 310A and the second transmission line 520 in order to solve the manufacturing problem. That is, when the first log periodic antenna element 200 and the second log periodic antenna element 300 are fed through a coaxial cable or the like, the surface area Is to solve the problem of decreasing the thermal conductivity.

When the overall antenna size of the first antenna element 210A and the third antenna element 310A is small so that the thermal conductivity due to soldering is not a problem, And when the overall size of the antenna is large and the thermal conductivity due to soldering becomes a problem, the antenna can be implemented as a folded logarithmic periodic antenna 30 of the type shown in FIG.

The folded logarithmic periodic antenna 30 is configured to connect the first antenna element 210 and the third antenna element 310 to the first antenna element 210A and the second antenna element 210B, respectively, for easy soldering of the RF cable, The first transmission line and the third antenna element 310A and the second transmission line 520. The first transmission line 510 and the second transmission line 520 of the folded log periodic antenna 30 are separated into two layers, The transmission line 520 is implemented using a flat plate having a small width and a small thickness.

The folded logarithmic periodic antennas 20 and 30 of FIGS. 2 through 4 may be configured to couple the first log periodic antenna element 200 to the first antenna element 210 and the second antenna element 220 And the second log periodic antenna element 300 is divided into the third and fourth antenna elements 310 and 310A and the fourth antenna element 320, respectively. The folded log periodic antennas 20 and 30 including the plurality of antenna elements 210, 210A, 220, 310, 310A, and 320 may implement a folding structure. The folded log periodic antennas 20 and 30 including the plurality of antenna elements 210, 210A, 220, 310, 310A and 320 may be arranged on both sides or one side of the arrangement of pawl elements, You can change the antenna size by arranging.

5 is a plan view of the folded log-periodic antenna shown in Figs. 2 and 3. Fig.

)하면서 제 1 중앙 도전 선로(212)와 제 2 중앙 도전 선로(222)를 따라 직렬 배치된다고 할 때,

등의 홀수 번째 길이의 소자는 상기 제 1 중앙 도전 선로(212)의 일측에 존재하며,

등의 짝수 번째 길이의 소자는 상기 제 2 중앙 도전 선로(222)의 일측에 존재하도록 배치된다.Referring to FIG. 5, in the first antenna element 210 and the second antenna element 220 constituting the first log periodic antenna element 200, the first pole element 211 and the second pole element 211, Lt; RTI ID = 0.0 > 221 < / RTI >

) And arranged along the first central conductive line 212 and the second central conductive line 222 in series,

And the like are present on one side of the first central conductive line 212,

And the like are disposed on one side of the second central conductive line 222.

등의 홀수 번째 길이의 소자는 상기 제 4 중앙 도전 선로(322)의 일측에 존재하며,

등의 짝수 번째 길이의 소자는 상기 제 3 중앙 도전 선로(312)의 일측에 존재하도록 배치된다.In the third antenna element 310 and the fourth antenna element 320 constituting the second log periodic antenna element 300,

Are located on one side of the fourth central conductive line 322,

Are arranged on one side of the third central conductive line 312. The third central conductive line 312 is connected to the third central conductive line 312. [

는 해당 주파수 대역의 파장이

라 할 때,

라는 수식에 의해 결정된 것으로서, 한 쌍의 동일 길이 폴소자들의 위치는 중앙 도전선로들을 중심축으로 할 때, 상하 대칭이면서 마주보는 위치에 배치되도록 한다.
At this time, in the first log periodic antenna element 200 and the second log periodic antenna element 300, the length of the pole element

The wavelength of the corresponding frequency band is

In other words,

, And the positions of the pair of equal length pole elements are arranged symmetrically with respect to the central conductive lines as the central axis.

6 is an exploded perspective view of the folded logarithmic periodic antenna shown in FIG.

This is a view for disassembling and assembling the antenna in a normal operation for transmission / reception.

Referring to FIG. 6, when the logarithmic periodic dipole antenna according to the present invention operates normally for transmission / reception, the first antenna element 210A, which is one of the components of the first log periodic antenna element 200, The first pole elements 211 are located only on the upper side with respect to the first central conductive line 212 and the second antenna element 220 which is another component is positioned on the second central conductive line 222 The second pole elements 221 are disposed only on the lower side on the basis of the first central conductive line 222 and the fixed magnet 422 inserted on the second central conductive line 222 and on the first central conductive line 212 The first antenna element 210A and the first transmission line 510 are formed in the direction of the arrow shown in FIG. 7 after the inserted fixed magnet 423 is coupled. By inserting and rotating the first fixing bar 410 into the fixing hole, the connection between them is completed It is. At this time, the first fixing bar 410 is inserted with a screw so that it can be fixed after passing through the fixing hole 612, the fixing hole 613, and the third fixing hole 614.

The third antenna element 310A, which is one of the components of the second log periodic antenna element 300, has the third pole elements 311 on the upper side only with respect to the third central conductive line 312 And the fourth antenna element 320, which is another component, is arranged so that the fourth pole elements 321 are located only on the lower side with respect to the fourth central conductive line 322, The coupling between the fourth antenna element 320 and the third antenna element 310A and the second transmission line 520 may be performed by first coupling the fixed magnet 442 and the fixed magnet 443, ) Is inserted into the corresponding fixing hole to be fastened. Like the first fixing bar 410, the fixing rod 430 is inserted with a screw so that it can be fixed through the fixing hole 622, the fixing hole 623, and the fixing hole 624.

The fixing magnets 421, 422, 423, 441, 442, 443, the fixing holes 611, 612, 613, 614, 621 622, 623, and 624 and the fixing rods 410 and 430 are described for convenience of description, and may be variously arranged in various positions, various shapes, or various numbers in consideration of the size or usability of the folded log- ≪ / RTI >

FIG. 7 is an enlarged view exemplarily showing the coupling state of the first log periodic antenna element shown in FIG. 6. FIG.

7, the stationary magnet 422 of the second antenna subunit 220 and the stationary magnet 423 of the first antenna subunit 210A may be coupled to each other. In order to couple the second antenna element 220, the first antenna element 210A and the first transmission line 510, the fixing rod 410 is fixed to the fixing hole 612, The hole 613, and the fixing hole 614 through insertion and rotation.

6, the fixed magnet 442 of the fourth antenna sub element 320 and the fixed magnet 443 of the third antenna sub element 310A may be coupled to each other. In order to connect the second transmission line 520, the third antenna element 310A and the fourth antenna element 320, the fixing rod 430 is fixed to the fixing hole 622, 623, and the fixing hole 624 through insertion and rotation.

FIGS. 8 and 9 are views for explaining application in portable and storage by rearranging and assembling the antenna sub-elements of the folded log-periodic antenna of the present invention.

FIG. 8 is a perspective view exemplarily illustrating a state in which the folded logarithmic periodic antenna shown in FIG. 3 is folded. FIG.

Referring to FIG. 8, the folded log periodic antenna 20 has a structure similar to the folded log periodic antenna 30 described with reference to FIGS. 6 and 7, and the first transmission line 510 and the second transmission And does not include the line 520. Therefore, the description of the folded log periodic antenna 20 of FIG. 8 will be made with reference to FIGS. 6 and 7. FIG.

Therefore, when the folding logarithmic periodic antenna 20 is folded, the second antenna element 220, the first antenna element 210, the third antenna element 310, 320).

At this time, the directions of the pole elements 211, 221, 311, and 321 of the antenna sub-elements 210, 220, 310, and 320 may be coupled to one direction.

At this time, the fixed magnet 421 of the second antenna element 220 may be coupled to the fixed magnet 423 of the first antenna element 210, and the fixed rod 410 may be fixed Holes 611 and 613, respectively. The fixed magnet 441 of the fourth antenna element 320 may be coupled to the fixed magnet 443 of the third antenna element 310 and the fixed rod 430 may be fixed Holes 621 and 623, respectively.

FIG. 9 is a perspective view exemplarily illustrating a state in which the folded logarithmic periodic antenna shown in FIG. 4 is folded. FIG.

9, when the folded log-periodic antenna 30 is folded, the second antenna element 220, the first antenna element 210A, the first transmission line 510, The transmission line 520, the third antenna sub-element 310A, and the fourth antenna sub-element 410 in this order.

At this time, the direction of the pole elements 211, 221, 311, and 321 of the antenna sub-elements 210A, 220, 310A, and 320 may be coupled to one direction.

At this time, the stationary magnet 421 of the second antenna element 220 may be coupled to the stationary magnet 423 of the first antenna element 210A, and the stationary rod 410 may be fixed Holes 611, 613 and 614, respectively. The fixed magnet 441 of the fourth antenna element 320 may be coupled to the fixed magnet 443 of the third antenna element 310A and the fixed rod 430 may be fixed Holes 621, 623, and 624, respectively.

10 is an exploded perspective view for explaining a state in which the folded logarithmic periodic antenna shown in FIG. 9 is folded.

Referring to FIG. 10, a detailed description of the structure of the folded log periodic antenna 30 will be given with reference to FIG. Here, a state in which the folded logarithmic periodic antenna 30 is folded will be described.

In order to fold the folded logarithmic periodic antenna 30, the pole elements 211, 221, 311, and 321 of the antenna sub-elements 210A, 220, 310A, and 320 are disposed in one of the upward direction and the downward direction As shown in FIG.

At this time, the stationary magnet 421 of the second antenna subunit 220 and the stationary magnet 423 of the first antenna subunit 210A are used for mutual coupling. In order to couple the second antenna element 220, the first antenna element 210A and the first transmission line 510, the fixing rod 410 is fixed to the fixing hole 611, (613), and the fixing hole (614) through insertion and rotation.

The fixed magnet 441 of the fourth antenna subunit 320 and the fixed magnet 443 of the third antenna subunit 310A are used for mutual coupling. The fixing rod 430 is fixed to the fixing hole 621 and the fixing hole 623 to join the second transmission line 520, the third antenna element 310A and the fourth antenna element 320. [ ) And through the fixing hole 624 through insertion and rotation, and then fixed.

When the foldable log periodic antenna 30 is folded, the size of the foldable antenna can be reduced to half the original size.

FIG. 11 is an enlarged view exemplarily showing the coupling state of the first log periodic antenna element shown in FIG. 10; FIG.

Referring to FIG. 11, the folded log periodic antenna 30 in a folded state has a form different from that of FIG. At this time, in addition to the arrangement of the pawl elements 211, 221, 311, and 321 in one direction, the coupling positions of the second antenna element 220 and the first antenna element 210A are changed .

That is, in FIG. 7, the ends of the second antenna element 220, the first antenna element 210A, and the first transmission line 510 coincide with each other. However, in FIG. 11, the ends of the first antenna element 210A and the first transmission line 510 coincide with each other, and the second antenna element 220 is spaced apart from the right by a predetermined distance.

7 shows a state where the second antenna sub element 220 and the first antenna sub element 210A are coupled through the fixed magnets 422 and 423 and the second antenna sub element 220, The first antenna element 210A and the first transmission line 510 are coupled through a fixing rod 410 passing through the fixing holes 612, 613 and 614.

11, the second antenna sub element 220 and the first antenna sub element 210A are coupled through the fixed magnets 421 and 423, and the second antenna sub element 220, The first antenna element 210A and the first transmission line 510 are connected to the fixing rod 410 passing through the fixing hole 611, the fixing hole 613 and the fixing hole 614, Lt; / RTI >

This type of folding structure is due to the polarity of the magnet (N pole, S pole). This is because when the antenna sub-elements 210A and 220 are rearranged to align the directions of the pole elements 211 and 221 in the same direction, the fixed magnets 422 and 423 have the same polarity. That is, in the folding structure, the fixed magnets 422 and 423 push each other out, and the second antenna element 220 and the first antenna element 210A can not be coupled.

Therefore, the fixed magnet 421 having a polarity opposite to that of the fixed magnet 422 at a certain interval is coupled to the left (or right) side. Therefore, when the folding logarithmic periodic antenna 30 is folded, the second antenna element 220 and the first antenna element 210A are coupled to each other through the combination of the fixed magnet 421 and the fixed magnet 423, .

Therefore, additional fixing holes 611 are required in addition to the fixing holes 612 according to the distance and position between the fixed magnets 421 and 422. The spacing distance and the spacing direction of the fixing holes 611 are determined with reference to the fixing holes 612 according to the spacing distance and the spacing distance between the fixed magnets 421 and 422.

Therefore, the fixing rod 430 can couple the antenna sub-elements 220 and 210A with the first transmission line 510 through the fixing holes 611, 613, and 614.

The coupling between the antenna sub-elements 310A and 320 and the second transmission line 520 may be performed by coupling the antenna sub-elements 220 and 210A having a symmetrical structure with the first transmission line 510 The stationary magnet 441 and the stationary hole 621 are spaced apart from the stationary magnet 442 and the stationary hole 622 by a predetermined distance.

FIG. 12 is a perspective view exemplarily showing another folded shape of the folded log periodic antenna shown in FIG. 8. FIG.

12, the first antenna element 210 and the second antenna element 220 are coupled to each other, and the third antenna element 310 and the fourth antenna element 320 are coupled to each other. do.

At this time, the first log periodic antenna element 200, the third antenna element 310, and the fourth antenna element 310, which are formed by the first antenna element 210 and the second antenna element 220, May be deformed at a predetermined angle between the second log periodic antenna elements (300) formed by the element (320).

13 is a cross-sectional view for explaining another folded shape of the folded logarithmic periodic antenna shown in FIG.

)은 0도(

= 0)가 된다.Referring to FIG. 13, the first log periodic antenna element (the first antenna element sub element 210 and the second antenna sub element element 220) and the second log periodic antenna element The sub-element 310 and the fourth antenna sub-element 320) are parallel to each other. Therefore, the distance between the first log periodic antenna element 200 and the second log periodic antenna element 300

) Is 0 degree (

= 0).

)을 갖는다(

>

> 0). 제 2 라인(B-B')를 기준으로 상기 제 2 대수주기 안테나 소자(상기 제 3 안테나 부소자(310)와 상기 제 4 안테나 부소자(320))는 0도를 초과하고, 90도 미만의 이격각(

)을 갖는다(

>

> 0). 상기 제 1 라인(A-A')과 상기 제 2 라인(B-B')은 상호 간에 평행하다.Here, the first log periodic antenna element (the first antenna element sub element 210 and the second antenna sub element element 220) is more than 0 degrees and 90 Spacing angle less than

)

>

> 0). The second log periodic antenna element (the third antenna element 310 and the fourth antenna element 320) is more than 0 degrees and less than 90 degrees with respect to the second line B-B ' Spacing angle (

)

>

> 0). The first line (A-A ') and the second line (B-B') are parallel to each other.

FIG. 14 is an exemplary view showing an expanded form of the folded log periodic antenna shown in FIG. 12. FIG.

Referring to FIG. 14, the antenna sub-elements 210, 220, 310 and 320 of the folded log periodic antenna 20 can be rearranged and used in an expanded form. At this time, if the antennas are shifted by a predetermined angle without arranging them parallel to each other as shown in FIG. 13, antenna impedance matching and band characteristics can be improved.

In the figures of the present invention, each log periodic antenna element is divided into two layers (two antenna elements) (for example, implemented on a single plate) and three layers (two antenna elements and one Transmission line) (e.g., implemented on two different flat plates separated by a transmission line and an antenna sub-element), but they have similarities except for some structures.

As described above, according to the present invention, when the folded antenna is not operated by an antenna such as a moving or storing device through a folded log-periodic antenna structure, the folded antenna is folded and used. When the antenna is operated, have.

Particularly, the folded logarithmic periodic antennas proposed in the present invention are antennas of a very high frequency (VHF) / ultra high frequency (UHF) band for TV reception or communication, and can be frequently moved and installed If it is necessary to develop a structure that can reduce or vary the size of the antenna so that the operator can carry it easily, it can be effectively used in the field of radio wave measurement and surveillance.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (14)

A foldable log-periodic antenna in a communication system,
A first antenna element having a first antenna element arranged at one side of the first central conductive line and a second antenna element having second pole elements arranged at only one side of the second central conductor line, ;
The second antenna element including a third antenna sub-element in which third pole elements are arranged on only one side of the third central conductive line and a fourth antenna sub-element in which fourth pole elements are arranged on only one side of the fourth central conductive line, ;
A first coupling subunit for coupling and separating the first antenna subunit and the second antenna subunit; And
And a second coupling sub-unit for coupling and separating the third antenna sub-element and the fourth antenna sub-
Wherein the antenna comprises a plurality of antenna elements.
The method according to claim 1,
Wherein the first center conductive line and the second central conductive line are parallel to each other and the first pole elements are located in the upper direction of the first central conductive line when the antenna is operated as an antenna, The first antenna sub-element and the second antenna sub-antenna are coupled so that the second pole elements are positioned in the lower direction of the central conductive line,
The third central conductive line is parallel to the fourth central conductive line, the third pole elements are located in the upper direction of the third central conductive line, the fourth pole elements are positioned in the lower direction of the fourth central conductive line, Wherein the third antenna element and the fourth antenna element are coupled to each other.
The method according to claim 1,
Wherein the first folding element, the second folding elements, the third folding elements, and the fourth folding elements are arranged on an upper side of the first central conductive line The first antenna sub-element and the second antenna sub-element are combined so that the first antenna sub-element and the second antenna sub-element are both positioned in one direction of the second central conductive line, Foldable logarithmic periodic antenna.
The method according to claim 1,
Wherein the first coupling subassembly and the second coupling subassembly each include a plurality of fixed magnets and a plurality of fixed rods.
5. The method of claim 4,
The second central conductive line and the fourth central conductive line each include at least two fixed magnet insertion holes positioned at regular intervals for inserting the fixed magnets whose polarities are opposite to each other among the plurality of fixed magnets, Wherein the first central conductive line and the third central conductive line each include at least one fixed magnet hole into which a stationary magnet for being coupled to one of the stationary magnets located in the at least two stationary magnet insertion holes is inserted, Foldable logarithmic periodic antenna.
5. The method of claim 4,
Wherein the second central conductive line and the fourth central conductive line each include at least two fixing holes located at regular intervals to insert the plurality of fixing rods.
The method according to claim 6,
Wherein the first central conductive line includes at least one fixing hole into which the first fixing bar is inserted through one of at least two fixing holes included in the second central conductive line, And at least one fixing hole into which the second fixing bar is inserted through one of the at least two fixing holes included in the fourth central conductive line.
The method according to claim 1,
A first transmission line which is implemented on a flat plate different from the first antenna sub-element and is coupled to the first log periodic antenna element; And
And a second transmission line, which is implemented on a flat plate different from the third antenna sub-element,
Further comprising: a folded logarithmic periodic antenna.
9. The method of claim 8,
Wherein the first transmission line includes at least one fixing hole into which a first fixing bar is inserted for coupling with the first log periodic antenna element, and the second transmission line includes a coupling with the second log periodic antenna element And at least one fixing hole into which the second fixing bar is inserted.
delete delete The method according to claim 1,
The first pole elements and the second pole elements are arranged in series with a decreasing length alternately in accordance with the ratio of logarithmic periods, the odd-numbered elements are located on one side of the first central conductive line, Length element is located on one side of the second central conductive line,
The third pole elements and the fourth pole elements are arranged in series with a decreasing length alternately in accordance with the ratio of logarithmic periods, the even-numbered elements are located on one side of the third central conductive line, Length element is located on one side of the fourth central conductive line.
13. The method of claim 12,
The first through fourth pole elements may be arranged such that pawl elements having the same length may be arranged in positions vertically symmetrically opposed to each other with respect to the first central conductive line to the fourth central conductive line, 1 < / RTI > antenna element to the fourth antenna element element.
The method according to claim 1 or 8,
Wherein the first log periodic antenna and the second log periodic antenna have a spacing angle of greater than 0 degrees and less than 90 degrees centered on each other of parallel baselines.

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