KR102293354B1 - Omni-directional antenna for mobile communication service - Google Patents

Abstract

The present invention in the omni antenna for mobile communication service; A plurality of radiating elements disposed at the same angle to each other on a horizontal plane, each radiating a beam; It includes a feeding unit for distributing and providing a feeding signal to each of the plurality of radiating elements; Each of the plurality of radiating elements has a combined structure of a dipole radiating unit for horizontal polarization having two radiation arms and a dipole radiating unit for vertical polarization having two radiation arms.

Description

OMNI-DIRECTIONAL ANTENNA FOR MOBILE COMMUNICATION SERVICE

The present invention relates to an antenna that can be applied to a base station or a relay station in a mobile communication (PCS, Cellular, CDMA, GSM, LTE, etc.) network, and more particularly, to an omni antenna.

An omni antenna, called a non-directional antenna, refers to an antenna designed to radiate electromagnetic waves evenly in the entire 360-degree horizontal direction. In a mobile communication network, a mobile communication terminal is provided with an omni-antenna employing a typical circular mono-pole antenna structure because it cannot predict which direction it will move due to its characteristics. Antenna installed in a mobile communication network base station or relay station is usually provided with a directional antenna for directing each service range divided into three sectors.

Recently, as Long Term Evolution (LTE) service is in full swing, it is required to construct a small cell or ultra-small cell equipment for smooth service in a shaded area, such as inside a building, and to increase data transmission speed. Small cells for outdoor use are serviced in a coverage of 0.5 to 1.5 km, and since the size of the equipment itself also requires a small size, it may be useful to employ an omni antenna for the antenna applied to the equipment.

A commonly used omni antenna mainly uses a single polarization (V-pol). However, for LTE service, MIMO (Multi Input Multi Output) technology is inevitable, and for this, a double polarization antenna is absolutely necessary. In the omni-antenna, conventionally, double polarization refers to horizontal polarization (H-pol; 0 degrees) and vertical polarization (V-pol; 90 degrees).

However, double polarization (+/-45 degrees) has the lowest correlation between the two polarized waves in the reflection or diffraction of radio waves due to fading. are doing Accordingly, research is being conducted to generate +/-45 degree double polarization in the omni antenna. Implementing the structure was a difficult task. Moreover, in addition to generating +/-45 degree double polarization, considering that it is installed in a small cell such as inside a building, when considering implementing the size of the omni antenna in a small size, this was a more difficult task.

Accordingly, an object of the present invention is to provide an omni-antenna for a mobile communication service for generating +45 degrees or -45 degrees polarization while satisfying excellent omni-direction radiation characteristics.

Another object of the present invention is to provide an omni-antenna for mobile communication service for generating +/-45 degree dual polarization.

Another object of the present invention is to provide an omni-antenna for mobile communication service for generating +/-45 degree double polarization while implementing a small size.

According to one aspect of the present invention in order to achieve the above object, in the omni antenna for mobile communication service; A plurality of radiating elements disposed at the same angle to each other on a horizontal plane, each radiating a beam; and a feeding unit for distributing and providing a feeding signal to each of the plurality of radiating elements; Each of the plurality of radiating elements is characterized in that it has a combined structure of a dipole radiating unit for horizontal polarization having two radiation arms and a dipole radiating unit for vertical polarization having two radiation arms.

Each of the plurality of radiating elements may be configured in a pattern printing method using a flexible printed circuit board (F-PCB).

The plurality of radiating elements may be disposed at predetermined intervals on the flexible printed circuit board, and the flexible printed circuit board may be installed in a cylindrical structure.

Each of the plurality of radiating elements is connected to each other at one or the other side of the dipole radiating arm for the horizontally polarized wave and one or the other radiating arm of the dipole radiating part for the vertical polarization at a position at the center of the radiating element, or the horizontally polarized wave one side or the other radiation arm of the dipole radiation unit for the vertical polarization and the other or one radiation arm of the dipole radiation unit for vertical polarization have a structure in which they are respectively connected to each other at a position at the center of the radiation element; The horizontal polarization dipole radiation pattern and the vertical polarization dipole radiation portion may be designed to be simultaneously powered to the connected portions.

According to another feature of the present invention, in the omni antenna for mobile communication service; A plurality of radiating element arrays arranged at the same angle to each other on a horizontal plane, each comprising a plurality of radiating elements for emitting a beam, each of which is continuously arranged in a vertical direction; It includes a feeding unit for distributing and providing a feeding signal to each of the plurality of radiating element arrays; Each of the plurality of radiating elements of the plurality of radiating elements is characterized in that it has a combined structure of a horizontally polarized dipole radiating unit having two radiating arms and a vertically polarized dipole radiating unit having two radiating arms.

In each of the plurality of radiating element arrays, each of the plurality of radiating elements, one or the other radiating arm of the dipole radiating unit for horizontal polarization and one or the other radiating arm of the dipole radiating unit for vertical polarization is located at the center of the radiating element is composed of first type radiating elements each having a structure connected to each other, or the other side or one side of the radiating arm of the dipole radiating unit for horizontal polarization and the other or one radiating arm of the dipole radiating unit for vertical polarization is located at the center of the radiating element composed of second-type radiating elements each having a structure connected to each other at positions; The horizontal polarization dipole radiation pattern and the vertical polarization dipole radiation portion may be designed to be simultaneously powered to the connected portions.

In each of the plurality of radiating element arrays, the plurality of radiating elements may be simultaneously configured in a pattern printing method using a single flexible printed circuit board (F-PCB).

In each of the plurality of radiating element arrays, the plurality of radiating elements are composed of first to third radiating elements; The flexible printed circuit board on which the first to third radiating elements are formed may be installed in a cylindrical structure.

The plurality of radiating element arrays may have a combination structure of at least one radiating element array composed of the first type radiating elements and at least one radiating element array composed of the second type radiating elements.

The plurality of radiating element arrays have a structure in which the first to fourth radiating element arrays are continuously arranged in a vertical direction; The first and second radiating element arrays are composed of the first type or second type radiating elements, the third and fourth radiating element arrays are the first and second radiating element arrays of a different type from the radiating element array It may consist of elements.

The feeding unit for distributing and providing a feeding signal to each of the plurality of radiating element arrays includes a plurality of feeding boards for providing a power supply signal for each of the plurality of radiating element arrays; Each of the plurality of power supply substrates, a substrate inner layer; a feeding pattern formed on the upper surface of the inner substrate layer and having a plurality of coupling feeding patterns for respectively supplying power to a plurality of radiating elements formed in a corresponding radiating element array in a coupling manner; A ground pattern formed on a lower surface of the inner layer of the substrate may be included.

Each of the plurality of feeding substrates is fed through a plurality of feeding lines; at least one connection passage for passing at least one of the feed line(s) feeding the other feeder board(s) is formed in the form of a through hole; A feed line passing through the connection passage may be soldered to the ground pattern.

As described above, the omni antenna for mobile communication service according to the present invention can generate +/-45 degree double polarization while satisfying excellent omnidirectional radiation characteristics, and furthermore, the overall antenna size can be implemented in a small size.

1 is a schematic separation structural diagram of an omni antenna for mobile communication service according to a first embodiment of the present invention;
Figure 2 is a first type structural diagram of one radiating element of Figure 1;
Figure 3 is a second type structural diagram of one radiating element of Figure 1;
Figure 4 is a graph showing the radiation characteristics of the omni antenna of Figure 1
5 is a perspective view of an omni antenna for mobile communication service according to a second embodiment of the present invention;
6 is a front view of the omni antenna of FIG. 5
7 is a schematic diagram showing the combination characteristics of the polarization direction between the radiating element arrays of FIG. 5
8 is a detailed perspective view of one radiating element array of FIG.
9 is an exploded plan view of one radiating element array of FIG.
10 is an exploded plan view of another radiating element array of FIG.
11 is a plan view of a power supply substrate applied to one radiating element array of FIG.
12 is a rear view of the power supply board of FIG.
13 is a plan view of a power supply substrate applied to another radiating element array of FIG.
14 is a rear view of the power supply board of FIG. 13
15 is a connection structure diagram of a feed line to the feed boards of the omni antenna of FIG.
16 to 19 are graphs showing radiation characteristics of the omni antenna of FIG. 5
20 is a perspective view of a radiating element array according to another embodiment of the present invention;
21 is a structural diagram of a radiating element according to another embodiment of the present invention;

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific items such as specific components are shown, which are provided to help a more general understanding of the present invention, and it is understood that certain modifications or changes can be made within the scope of the present invention. It will be obvious to those with ordinary knowledge in

1 is a schematic separation structural diagram of an omni antenna for mobile communication service according to a first embodiment of the present invention, and FIG. 2 is a structural diagram according to a first type of each of the first to third radiating elements of FIG. 1 and 2, the omni antenna according to the present invention is, for example, a combination of three radiating elements, that is, the first to third radiating elements (11: 11-1, 11-2, 11-3) structure can be implemented.

1 and 2, the radiation pattern 110 of the first to third radiation elements 11 is for horizontal polarization (H-pol) having two radiation arms (radiating arms) 110b and 110d, respectively. It has a combined structure of a dipole radiating unit and a vertically polarized (V-pol) dipole radiating unit having two radiation arms 110a and 110c. At this time, in each radiating element 11 , the one-side radiation arm 110d of the dipole radiating unit for horizontally polarized wave and the one-side radiating arm 110a of the dipole radiating unit for vertical polarization are the feeding point P located at the center of the radiating element 110 . ) are connected to each other, and the other radiation arm 110b of the dipole radiation unit for horizontal polarization and the other radiation arm 110c of the dipole radiation unit for vertical polarization are connected at a portion corresponding to the feeding point P have

That is, one side radiation arm 110d of the dipole radiation unit for horizontal polarization and one radiation arm 110a of the dipole radiation unit for vertical polarization are integrally provided as a pair, and the other radiation arm 110b of the dipole radiation unit for horizontal polarization. ) and the other side radiation arm 110c of the dipole radiation unit for vertical polarization are formed as a pair and are integrally provided.

Looking at the configuration of the feeding unit for providing a feeding signal to each radiating element 11 , the feeding point P of each radiating element 11 is connected to a feeding line (for example, reference number 14 in FIG. 1 ) to feed it. However, through the feeding point (P), the one side radiation arm (110d) of the dipole radiation pattern for horizontally polarized wave and the one side radiation arm (110a) of the dipole radiation part for vertical polarization are connected to a connection part, and a dipole radiation part for horizontal polarization The other side radiation arm (110b) and the other side radiation arm (110c) of the dipole radiating unit for vertical polarization is designed to simultaneously feed power to the connecting portion.

Each of the radiation patterns of the first to third radiation elements 11 may be formed by molding a thin metal plate (eg, a copper plate). In addition, as shown in the example of FIG. 2 , it may be implemented as a circuit pattern through a pattern printing method using a flexible printed circuit board (F-PCB) 122 .

Here, the plurality of radiating elements 11 are described as an example of the technology implemented in the F-PCB, but the plurality of radiating elements are not limited to the PCB and may be formed using a copper plate bent in a circular or oval shape. Also, instead of the F-PCB, a plurality of radiating elements may be disposed by configuring a general flat PCB in a polygonal shape such as a triangle or a square. At least one radiating element may be disposed on each flat PCB.

As shown in FIG. 2 , the structure of the first to third radiation elements 11 combines a miniaturized bow tie type dipole antenna for horizontal polarization and a bow tie type vertical polarization dipole antenna. Thus, it can be seen that, for example, it is a (first type) structure that generates a polarized wave in a direction of +45 degrees. In this case, by designing the dipole radiation unit for horizontal polarization and the dipole radiation unit for vertical polarization symmetrical to each other, accurate +45 degree (or -45 degree) polarization can be generated. Meanwhile, FIG. 3 shows a structure according to the second type of each radiating element 11 shown in FIG. 1 , and a radiation pattern of each radiating element 11 according to the second type of structure shown in FIG. 3 . Reference numeral 113 denotes a horizontally polarized (H-pol) dipole radiating part having two radiation arms 113b and 113d, respectively, and a vertical beam having two radiation arms 113a and 113c, similar to the structure shown in FIG. 2 . It has a combined structure of a polarization (V-pol) dipole radiating part.

At this time, in each radiating element, the one side radiation arm 113d of the dipole radiating unit for horizontal polarization and the other radiating arm 113c of the dipole radiating unit for vertical polarization correspond to the feeding point P located at the center of the radiating element 113 . It has a structure in which the other radiating arm 113b of the dipole radiating unit for horizontal polarization and the other radiating arm 113c of the dipole radiating unit for vertical polarization are connected at a site corresponding to the feeding point P. That is, the one side radiation arm 113d of the dipole radiation part for horizontal polarization and the other radiation arm 113c of the dipole radiation part for vertical polarization are integrally provided as a pair, and are perpendicular to the other radiation arm 113b of the dipole radiation part for horizontal polarization. It can be seen that the other side radiation arm 113c of the dipole radiation unit for polarization is formed as a pair and is integrally provided.

At this time, through the feeding point (P), the connecting portion where the one side radiation arm (113d) of the dipole radiation pattern for horizontal polarization and the other radiation arm (113c) of the dipole radiation part for vertical polarization are connected, and the dipole radiation part for horizontal polarization The other side radiation arm (113b) and the one side radiation arm (113a) of the dipole radiation part for vertical polarization are designed to simultaneously feed power to the connecting portion.

It can be seen that this structure generates a polarization in the -45 degree direction. In this way, by forming the radiation patterns of the first to fourth radiation elements in the structure shown in FIG. 2 or FIG. 3, a required +45 degree or -45 degree polarization can be selectively generated.

Each of the first to third radiating elements 11 having the same configuration as shown in FIG. 2 or 3 is mutually coupled to form an omni antenna according to an embodiment of the present invention, in the horizontal direction from one reference point on the horizontal plane. They may be arranged at regular intervals from each other according to a predetermined angle. For example, as shown in FIG. 1 , the first to third radiating elements 11 are installed facing each other at the same angle of 120 degrees on the entire 360 degree horizontal plane, and the beam in the horizontal direction at the installed position It can be configured to emit At this time, each feeding point P of the first to third radiating elements 11 may be configured to receive a signal distributed by 1/3 from one feeding line 14 , respectively. In addition, the omni antenna according to the first embodiment of the present invention, like a typical antenna structure, a case (not shown) including a radome structure that forms the overall outer shape of the omni antenna, each radiating element 11 and A support (not shown) for supporting the feed line may be provided, and in addition, signal processing equipment for processing a transmission/reception signal may be further provided.

In the above, as shown in FIGS. 2 and 3 , it can be seen that the four radiation arms are designed to have the same shape in a symmetrical structure to each other. In this way, when the four radiation arms are designed to be symmetrical and have the same shape, the simulation work for adjusting the amplitude and phase of the dipole radiation part, which must be performed when the radiation arms have an asymmetric structure, is omitted. There are advantages to doing. Therefore, the manufacturing process can be simplified, the manufacturing time can be shortened, and it is easy for mass production.

4 is a graph showing the radiation characteristics of the omni antenna of FIG. 1 three-dimensionally, as shown in FIG. 4, according to the first embodiment of the present invention configured as shown in FIGS. It can be seen that the omni antenna satisfies very good omni-direction radiation characteristics.

On the other hand, in the configuration of the omni antenna according to the first embodiment of the present invention, when the first to third radiating elements 11 are configured in the first type structure shown in FIG. 2, the omni antenna is overall + A 45 degree polarization is generated, and when the first to third radiating elements 11 are configured in the second type structure shown in FIG. 3, the omni antenna generates -45 degree polarization as a whole. Accordingly, another embodiment of the present invention proposes a structure for generating +/-45 degree double polarization using both the first type and the second type radiating elements. This structure, for example, can be configured by disposing a plurality of omni antenna structures as shown in FIG. 1 composed of the first type of radiating elements and the omni antenna structures composed of the second type of radiating elements in the vertical direction. have.

5 is a perspective view of an omni antenna for a mobile communication service according to a second embodiment of the present invention, FIG. 6 is a front view of the omni antenna of FIG. 5, and FIG. 7 is a combination of polarization directions between the radiating element arrays of FIG. It is a schematic diagram showing the characteristics. 5 to 7 , the omni antenna according to the second embodiment of the present invention has a structure in which a plurality of the omni antenna structures shown in FIG. 1 are combined. Each of the omni-antenna structures to be combined with a plurality will be referred to as a 'radiation element array' below.

That is, the omni antenna according to the second embodiment of the present invention may be configured such that the first to fourth radiating element arrays 21 , 22 , 23 , 24 are continuously arranged in a vertical direction. At this time, the first and second radiating element arrays 21 and 22 may have a configuration for generating -45 degree polarized waves in all directions by being composed of the second type of radiating elements shown in FIG. 3 . In addition, the third and fourth radiating element arrays 23 and 24 may have a configuration for generating +45 degree polarized waves in all directions by being composed of the first type of radiating elements shown in FIG. 2 .

Accordingly, the omni antenna according to the second embodiment of the present invention, as shown in FIG. 7, the -45 degree polarization generated in the first and second radiation element arrays 21 and 22, and the third and fourth radiation The +45 degree polarization generated from the device arrays 23 and 24 is combined with each other, thereby generating a double polarization of +/-45 degree as a whole. At this time, as shown in Figure 7, in order to increase the isolation (Isolation) between the +/-45 degree polarization may have a structure in which the radiating element arrays having the same polarization are bundled with each other and disposed adjacently.

As the separation distance (S) between the radiating element arrays (eg, the second and third radiating element arrays) generating different polarizations increases, the isolation characteristic is improved. However, in order to miniaturize the antenna, it is necessary to reduce the separation distance (S). There are several factors that affect the separation distance (S), and when the radiation beam width of each radiating element array is reduced, interference between the radiating element arrays is reduced and the separation distance (S) can be further reduced. In addition, the separation distance (S) is inversely proportional to the increase in the number of radiating element arrays.

In addition, the separation distance (g) between the same polarization radiation element arrays (eg, the first and second radiation element arrays, or the third and fourth radiation element arrays) is a sidelobe (sidelobe) characteristic and gain (gain) are appropriately set in consideration of the For example, the separation distance g may be set to about 0.75 to 0.8λ (λ: wavelength) compared to the processing frequency. Since the separation distance g is proportional to the gain and the size of the side lobe, the smaller the separation distance g, the less the side lobe. This makes it possible to make the omni antenna more compact.

In addition, in order to secure a higher degree of isolation between the radiating element arrays having the same polarization, it is installed to have a relative difference of about 60 degrees on a horizontal plane. For example, as shown more clearly in FIG. 6, when the radiating elements disposed on the first radiating element array 21 are installed so as to be positioned at 0 degrees, 120 degrees, and 240 degrees in a horizontal plane, the first Each of the radiating elements disposed on the 2 radiating element array 22 may be installed, for example, at a position facing 60 degrees, 180 degrees, 300 degrees.

5 to 7, the omni antenna according to the second embodiment of the present invention may be configured, and in FIGS. 5 and 6, the omni antenna according to the second embodiment of the present invention is a typical antenna. Similar to the structure, it has an upper cap 28 and a lower cap 29 as a case forming the overall outer shape of the omni antenna, and also includes a radiating element array between the upper cap 28 and the lower cap 29. Disclosed is provided with a radome (27) that wraps. In addition, the omni antenna according to the second embodiment of the present invention is a plurality of supporting the radiating element array, for example, the first to third supports 261, 262 of a material (plastic, Teflon, etc.) that does not affect the propagation characteristics. , 263) is shown. In addition, a power supply structure for feeding each radiating element array and signal processing equipment for processing a transmission/reception signal may be further provided.

FIG. 8 is a detailed perspective view of a radiating element array of FIG. 5, for example, the third radiating element array 23, and FIG. 9 is a radiating element array of FIG. 5, for example, the third radiating element array 23. It is an exploded plan view, and FIG. 10 is an exploded plan view of another radiating element array of FIG. 5 , for example, the first radiating element array 21 . 8 to 10 , the first to fourth radiating element arrays 21 to 24 shown in FIG. 5 are a plurality of, for example, three radiating elements on one flexible printed circuit board 232 or 212, respectively. The elements 23-1, 23-2, 23-3, or 21-1, 21-2, 21-3 are printed in a pattern printing manner to form (eg, arranged consecutively) according to a predetermined interval. configuration can be. (In FIG. 8, the illustration of the configuration corresponding to the printed circuit board is omitted for convenience of explanation.)

In this way, the flexible printed circuit board 232 or 212 on which the three radiating elements 23-1, 23-2, 23-3, or 21-1, 21-2, 21-3 are continuously formed is a cylindrical shape thereafter. It is installed in a form in which it is rolled in a circle, and both sides that come into contact with each other are attached to each other and fixed. The radiating elements installed on the flexible printed circuit board 232 or 212 are respectively fed through the power feeding boards (eg, 33 in FIG. 8 ) of the printed circuit board structure on which the feeding pattern is formed, as will be described later. can have At this time, the feeder board is formed in a circular shape having a size corresponding to the flexible printed circuit boards 232 and 212, and the flexible printed circuit boards 232 and 212 may be installed by rolling in a shape surrounding the circular feeder board.

At this time, in each flexible printed circuit board 232 or 212, for each radiating element 23-1, 23-2, 23-3, or 21-1, 21-2, 21-3, a dipole for horizontal polarization Through-holes 235 or 215 may be formed in the two radiation arms of the radiating unit at portions adjacent to the feeding point, respectively. In addition, protrusions (a) having sizes corresponding to the positions at which the through-holes 235 and 215 are formed may be formed in the power supply board (eg, 33 of FIG. 8 ). Through this structure, when the flexible printed circuit boards 232 and 212 are installed by being rolled in a shape surrounding the feeder board, the protrusion (a) of the feeder board is fitted into the through-holes 235 and 215. can be

In FIG. 8 , the shape in which the protrusion a of the power supply board 33 is inserted through the through hole 235 of the flexible printed circuit board 232 is shown in more detail in the circle area A indicated by the dashed-dotted line. At this time, in the power supply board 33, a ground pattern 334 (extending to the protrusion a) is formed on the lower surface of the inner substrate layer 330 made of epoxy or the like, and the protrusion (a) is a flexible printed circuit board 232 . ) in the state of being inserted into the through-hole 235, as shown as part b, a soldering operation is performed thereafter. Through this, the flexible printed circuit board 232 and the feeder board 33 are more stably fixed, and in addition, each radiating element 23-1 formed in each through hole 235 of the flexible printed circuit board 232. , 23-2, 23-3) may be electrically connected to the dipole radiation pattern 230 for horizontal polarization and the ground pattern 334 of the power supply board 33 .

As is clear from the configuration shown in FIGS. 8 to 10, in the omni antenna according to some embodiments of the present invention, in each flexible printed circuit board 232 or 212, each radiating element 23-1, 23-2, 23-3, or 21-1, 21-2, 21-3) are formed, and then, as each flexible printed circuit board 232 or 212 is installed in a rolled shape, each radiating element (23-1, 23-2, 23-3, or 21-1, 21-2, 21-3) It can be seen that the center part has a convex curved surface compared to the left and right edges, rather than a completely flat surface. This form enables a design that can most reduce the overall horizontal size of the radiating element array and thus the omni antenna, and furthermore, each radiating element (23-1, 23-2, 23-3, or 21-1, 21-2, 21-3), the combination of the radiation beams emitted is optimized to have an optimal omnidirectional radiation characteristic.

11 and 12 are a top view and a rear view of a first type of power supply board 33 applied to one radiation element array of FIG. 5, for example, the third radiation element array 23, and FIGS. 13 and 14 are Another radiating element array of Figure 5, for example, a top view and a rear view of the second type of power supply substrate 31 applied to the first radiating element array 21. 11 to 14, as a configuration of a feeding unit for providing a feeding signal to each radiating element array, looking at the configuration of the feeding board 33 or 31 in more detail, first, the first type feeding board 33 a substrate inner layer 330 made of a silver epoxy material or the like; a feeding pattern (332: 232-1, 232-2, 232-3) formed on the upper surface of the inner substrate layer 330; A ground pattern 334 formed on the lower surface of the inner substrate layer 330 is included. In addition, a plurality of supports (eg, 261 , 262 , 263 of FIGS. 5 and 6 ) are penetrated through the first type of feed substrate 33 , and a plurality of through-holes h11 for being supported by the plurality of supports are penetrated. , h12, h13) are formed, and, as will be described later, a plurality of connection passages (h21, h22, h23) for the feed line(s) to pass through may be formed in the form of through holes at appropriate positions.

The feeding patterns 332: 332-1, 332-2, 332-3 are first to third coupling feeding patterns for feeding power to the three radiating elements formed in the corresponding radiating element array 23 in a coupling manner, respectively. (332-2, 332-1, 332-3). The first to third coupling feed patterns (332-2, 332-1, 332-3) are 23 of the radiating element array in the protrusion (a) to which the feed plate 33 and the radiating element array 23 are coupled. ) It has a pattern for feeding power to each radiating element in a coupling method. The first to third coupling feeding patterns 332-2, 332-1, 332-3 have a structure in which feeding signals are distributed from one feeding point P formed in the center of the feeding board 33, respectively. this is formed The feeding point (P) is configured to receive a feeding signal through a feeding line (eg, 43) that may be composed of a coaxial cable.

In the circle region A indicated by the dashed-dotted line in FIG. 11 , the connection structure of the feed board 33 and the feed line 43 is shown in more detail, and may be connected to the feed line 43 at the lower portion of the feed board 33 . . The inner conductor 432 of the feed line 43 composed of a coaxial cable is inserted through the through hole h1 formed at the feed point P and passes through the feed board 33, and of the feed board 33 It is connected to the feeding pattern 332 of the upper surface. At this time, the external conductor 434 of the feed line 43 is connected to the ground pattern 334 of the lower surface of the feed board 33 . Then, it is soldered with the inner conductor 332 of the feed pattern 332 and the feed line 43 on the upper surface of the feed board 33, and the ground pattern 334 and the feed line 43 on the lower surface of the feed board 33. The outer conductor 434 is soldered.

13 and 14, a second type of power supply substrate 31 is shown. The second type of power supply substrate 31, like the first type of power supply substrate 33, includes: a substrate inner layer 310; a feeding pattern (312: 312-1, 312-2, 312-3) formed on the upper surface of the inner substrate layer 310; A ground pattern 314 formed on the lower surface of the inner substrate layer 310 is included. In addition, a plurality of supports pass through, a plurality of through holes (h11, h12, h13) for being supported by the plurality of supports, and a plurality of connection passages (h21, h22, h23) for passing a plurality of feed lines are provided. formed in an appropriate location.

The feeding patterns 312: 312-1, 312-2, 312-3 are first to third coupling feeding patterns for feeding power to the three radiating elements formed in the corresponding radiating element array 21 in a coupling manner, respectively. (312-2, 312-1, 312-3). The first to third coupling feeding patterns 312-2, 312-1, 312-3 have a structure in which feeding signals are distributed from one feeding point P formed in the center of the feeding board 31, respectively. this is formed The feeding point (P) is configured to receive a feeding signal through a feeding line that may be composed of a coaxial cable.

At this time, the first to third coupling feeding patterns 312-1, 312-2, and 312-3 formed on the second type of feeding board 31 are the feeding board 33 shown in FIGS. 11 and 12. ) is slightly different from the pattern formed in That is, the first to third coupling feeding patterns 312-2, 312-1, 312-3 formed on the second type of feeding board 31 are the feeding board 33 shown in FIGS. 11 and 12. ), the direction in which the feed signal travels in the signal coupling region is opposite to that of the pattern formed in FIG.

Figure 15 is a connection structure diagram of the feed line for the feed boards of the omni antenna of Figure 5, the first to fourth feed boards (31, 32, 33, 34) corresponding to each of the four radiating element arrays are continuous from the top. It schematically shows the state in which it is installed. Referring to FIG. 15 , the first to fourth power supply substrates 31 , 32 , 33 , and 34 are fed by first to fourth power supply lines 41 , 42 , 43 and 44 , respectively. In this case, the first and second feed lines 41 and 42 are configured to receive signals distributed through the first divider 52 from the first common feed line 40-1, respectively. Similarly, the third and fourth feed lines 43 and 44 are configured to receive signals distributed through the second divider 54 from the second common feed line 40-2, respectively.

In this configuration, the feed lines (41, 43, 40-1 in the example of FIG. 15) passing through another feed board portion among the feed lines 41-44 are connections formed on each feed board 31-34. It is designed to pass through passage h2: for example, h21, h22, h23 of FIGS. 11 to 14. In FIG. 15 , a structure in which the first feed line 41 passes through the connection passage h2 of the second feed board 32 is illustrated in more detail in the circle area A indicated by the dashed-dotted line in FIG. 15 . At this time, the first feed line 41 (external conductor of), which may be composed of a coaxial cable, is soldered to the ground pattern 324 formed on the lower surface of the second feed board 32 . Similarly, the feed lines passing through the connection passage of each feed board are soldered to the ground pattern formed on the lower surface of the feed board. Accordingly, the cable ground of the coaxial cable corresponding to each feed line and the ground of each feed board are soldered to each other, so that the grounding characteristics can be more stabilized.

On the other hand, in the above configuration, the length of the feed line connected to each feed board is designed, for example, to match the phase of the beam radiated from each radiating element array. Accordingly, for example, the length of the first feed line 41 and the second feed line 42 connected to the first distributor 52 may be designed to be the same. In this case, since the first and second feed boards 31 and 32 have the same phase using the same type of feed board, there is no phase difference between the two boards. If the first type of feed board and the second type of feed board have a structure in which feed signals between each other have a phase difference of 180 degrees depending on the difference in the feed pattern, the type of feed board installed in each radiating element array By appropriately designing differently, it is possible to significantly reduce the length of the feed line connected to one of the feed boards to correspond to a phase difference of 180 degrees. In this case, the length of the reduced feed line may vary depending on a wavelength, a dielectric constant, and the like. For example, when the first feed line 41 is 100 mm, the length of the second feed line 42 can be reduced to 60 mm at 2 GHz, 40 mm at 2.6 GHz, and the like.

The configuration of such a feed line can simplify the point in which a plurality of conventional feed cables are complicatedly connected. Therefore, structural convenience is improved in designing the antenna, power loss due to cables can be reduced, and it is also suitable for the purpose of miniaturization and weight reduction.

16 to 19 are graphs showing the radiation characteristics of the omni antenna of FIG. 5, and FIG. 16 shows the radiation characteristics of the omni antenna in three dimensions, and FIG. 17 shows the radiation characteristics in the vertical direction, FIGS. 18 and FIG. 19 shows the radiation characteristic in the horizontal direction. As shown in Figures 15 to 19, it can be seen that the omni antenna according to the embodiment of the present invention is formed very excellently in omnidirectional radiation characteristics. In particular, as shown in FIGS. 18 and 19, the ripple characteristic in the horizontal direction in the omnidirectional radiation pattern is about 0.2 dB in the design frequency band (e.g., 2.5 GHz, 2.6 GHz, 2.7 GHz), It can be seen that a very good radiation pattern is exhibited.

As described above, the configuration and operation of the omni-antenna for mobile communication service according to the embodiments of the present invention can be made, and on the other hand, in the above description of the present invention, although specific embodiments have been described, various modifications may increase the scope of the present invention. It can be carried out without departing.

For example, in the description of the above embodiments, it is disclosed that the omni antenna or the radiating element array is formed of three radiating elements, which is a configuration for minimizing the size of the radiating element array and the omni antenna. If, when designing the radiating element array and the omni antenna, the size restrictions are not large, it is also possible to form one radiating element array or omni antenna by combining four or more radiating elements. In addition, in some cases, it may be possible to combine only two radiating elements. It can be designed by changing the number of radiating elements according to the antenna usage environment. For example, in order to reduce the effect of the ripple that increases in proportion to the radiation pi in the high frequency band, the number of radiating elements can be reduced and the number of radiating elements can be increased in the low frequency band. .

Also, in the above description, the flexible printed circuit board on which the plurality of radiating elements are formed has been described as having a cylindrical shape, but in addition, it may have a polyhedral shape. For example, the radiating element array 25 shown in FIG. 20 is shown that three radiating elements 25-1, 25-2, 25-3 are formed on the flexible printed circuit board 251, at this time , The flexible printed circuit board 251 may be, for example, folded in the shape of a triangular pole, so that each radiating element 25-1, 25-2, 25-3 is disposed on each side one by one. In addition, in the above description, all of the radiating elements forming one omni antenna or one radiating element array are configured as a first type generating +45 degree polarization, or configured as a second type generating -45 degree polarization Although described as doing, a structure in which radiating elements of the first type and the second type are mixed may also be possible. For example, one radiating element array may be configured in a form in which a first type of radiating element generating a +45 degree polarization and a second type of radiating element generating a -45 degree polarized wave are alternately arranged with each other.

In addition, although the omni antenna according to the second embodiment disclosed a structure in which four radiating element arrays are combined, in addition, a structure in which two or six or more radiating element arrays are combined may be possible. In addition, the omni antenna according to the second embodiment has been described as having a structure in which radiating element arrays having the same polarization are bundled with each other and disposed adjacent to each other, but in addition, the radiating element array generating +45 degrees polarization and -45 degrees Radiating element arrays for generating polarized waves may be configured in a form in which they are alternately arranged with each other in the vertical direction.

In addition, in the above description, in order to simplify the manufacturing process and shorten the manufacturing time, it has been described that the four radiation arms of each radiating element are designed in the same shape with a symmetrical structure. It may be implemented in other shapes. For example, the structure of the radiation pattern 110' of the radiation element according to another embodiment of the present invention shown in FIG. 21 is, likewise, a dipole room for horizontal polarization having two radiation arms 110d' and 110b'. It has a combined structure of a vertical polarization dipole radiating part having a sabu and two radiating arms 110a' and 110c'. In this case, the radiation arms 110d ′ and 110b ′ of the dipole radiation unit for horizontal polarization and the radiation arms 110a ′ and 110c ′ of the dipole radiation unit for vertical polarization are illustrated as not having the same shape. At this time, the two radiation arms 110d' and 110b' of the dipole radiation unit for horizontal polarization have the same shape, and similarly, the two radiation arms 110a' and 110c' of the dipole radiation unit for vertical polarization have the same shape. As such, various modifications or changes of the present invention may be made, and therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the claims and equivalents of the claims.

Claims (17)

In the omni antenna for mobile communication service,
a plurality of radiating elements arranged at regular intervals from one reference point on a horizontal plane according to a predetermined angle in the horizontal direction, each radiating a beam;
A power feeding unit for distributing and providing a feeding signal to each of the plurality of radiating elements
It includes a radiating element array having;
Each of the plurality of radiating elements,
Comprising a dipole radiator for horizontal polarization having two radiating arms, and a dipole radiator for vertical polarization having two radiation arms,
The dipole radiating unit for horizontal polarization and the dipole radiating unit for vertical polarization is an omni antenna, characterized in that it is formed as a pattern on a flexible printed circuit board (F-PCB). According to claim 1,
The radiating element array is an omni-antenna, characterized in that a plurality of consecutively arranged in the vertical direction. delete According to claim 1,
The plurality of radiating elements are sequentially arranged according to a predetermined interval on the flexible printed circuit board,
The flexible printed circuit board is an omni antenna, characterized in that it has a polyhedral shape or a cylindrical shape. According to claim 1,
The radiation pattern of the plurality of radiating elements,
One radiation arm of the dipole radiation part for horizontal polarization and one radiation arm of the dipole radiation part for vertical polarization are integrally provided as a pair, and the other radiation arm of the dipole radiation part for horizontal polarization and the dipole radiation for vertical polarization A first type in which the other side radiation arm of the negative side is integrally provided as a pair, or
One radiation arm of the dipole radiation part for horizontal polarization and the other radiation arm of the dipole radiation part for vertical polarization are integrally provided as a pair, and the other radiation arm of the dipole radiation part for horizontal polarization and one side radiation of the dipole radiation part for vertical polarization Omni antenna, characterized in that the arm is composed of a second type integrally provided in a pair. 6. The method of claim 5,
Omni antenna, characterized in that the radiation arms of the dipole radiating unit for horizontal polarization and the radiation arms of the dipole radiating unit for vertical polarization are fed at the same time. 6. The method of claim 5,
Omni antenna, characterized in that at least two of the radiation arms of the dipole radiation unit for horizontal polarization and the radiation arms of the dipole radiation unit for vertical polarization have the same shape. 8. The method of claim 7,
The omni-antenna, characterized in that the radiation arm of the radiation unit for the horizontal polarization and the radiation arm of the radiation unit for the vertical polarization provided in the integrated pair are symmetrical to each other. 8. The method of claim 7,
The radiation arms of the dipole radiation unit for horizontal polarization have the same shape as each other,
The omni-antenna, characterized in that the radiation arms of the dipole radiating unit for vertical polarization have the same shape. 3. The method of claim 1 or 2,
The number of the plurality of radiating elements, Omni antenna, characterized in that three. 3. The method of claim 2,
The plurality of radiating element arrays, at least two or more generating a first polarized wave and a second polarized wave are consecutively arranged in the vertical direction, and the radiating element arrays having different polarization directions are symmetrical with each other in polarity in the vertical direction and have the same number Omni antenna, characterized in that disposed. 12. The method of claim 11,
The distance between the radiating element arrays having different polarization directions is inversely proportional to the number of radiating element arrays. 3. The method of claim 2,
The plurality of radiating element arrays are composed of radiating element arrays generating a first polarized wave and radiating element arrays generating a second polarized wave,
The feeding unit for distributing and providing a feeding signal to each of the plurality of radiating element arrays includes a plurality of feeding boards having a feeding pattern for providing a feeding signal for each of the plurality of radiating element arrays;
The plurality of feeding substrates
a first type and a second type in which a feed signal has a mutual phase difference according to a difference in the feed pattern is configured;
Omni antenna, characterized in that the first type and the second type of feeding boards are alternately provided to the radiating element arrays that generate the same polarization. 3. The method of claim 2,
The plurality of radiating element arrays are composed of radiating element arrays generating a first polarized wave and radiating element arrays generating a second polarized wave,
Radiating element arrays that generate the same polarization are omni-antenna, characterized in that they are arranged with a predetermined angle difference between each other on a horizontal plane. 15. The method of claim 14,
The predetermined angle is an omni antenna, characterized in that 60 degrees. 3. The method of claim 2,
The feeding unit for distributing and providing a feeding signal to each of the plurality of radiating element arrays includes a plurality of feeding boards for providing a power supply signal for each of the plurality of radiating element arrays;
Each of the plurality of power supply substrates,
a substrate inner layer;
a feeding pattern formed on the upper surface of the inner layer of the substrate and having a plurality of coupling feeding patterns for respectively feeding power to a plurality of radiating elements formed in a corresponding radiating element array in a coupling manner;
Omni antenna comprising a ground pattern formed on the lower surface of the inner layer of the substrate. 17. The method of claim 16,
Each of the plurality of power supply substrates,
being fed through a plurality of feeding lines;
at least one connection passage for passing at least one of the feed line(s) feeding the other feeder board(s) is formed in the form of a through hole;
Omni antenna, characterized in that the feed line passing through the connection passage is soldered to the ground pattern.

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