KR101333383B1 - Antenna including a radiator without plating - Google Patents

Abstract

Disclosed are antennas having excellent electrical properties, in particular antennas comprising unplated radiators, while reducing manufacturing costs and time. The antenna is a reflecting plate, an insulating portion arranged on one surface of the reflecting plate, positioned on the insulating portion, the feed portion, the first radiation member connected to the feed portion, the first balun portion and the second radiation connected to the first balun portion A first radiator having a member, a first radiator positioned over the insulation, having a second feed portion, a third radiating member connected to the second feed portion, a second balun portion and a fourth radiating member connected to the second balun portion; And a power distributor located on one surface of the reflector. Here, a first space is formed in the first feed part, a first feed line is arranged in the first space, a third space is formed in the second feed part, and a second feed line is the third space. And the first feed line and the second feed line are electrically connected to the inner conductor of the power cable through the power divider.

Description

ANTENNA INCLUDING A RADIATOR WITHOUT PLATING}

The present invention relates to an antenna, in particular a base station antenna.

The antenna has a radiation pattern for transmitting and receiving an RF signal (Radio Frequency), and generally has a structure shown in FIG. 1 below.

1 is a cross-sectional view showing a general antenna.

Referring to FIG. 1, the antenna includes a reflector plate 100, a first radiator 102, a second radiator 104, a power divider 120, and a power cable 130.

The first radiator 102 includes a first radiating member 110, a second radiating member 112, a feeding part 114, a balloon 116, and a feeding line 118.

The feed part 114 and the balloon part 116 penetrate the reflecting plate 100, as shown in FIG. 1, and are connected to a power distributor 120 positioned on the rear side of the reflecting plate 100. Here, the connection is made by soldering.

The feed line 118 penetrates the reflecting plate 100 and is directly connected to the balloon 116, that is, soldered.

In addition, the feed part 114 and the balloon part 116 are soldered and connected to the reflecting plate 100 which is a ground.

That is, ten solders (indicated by dots in FIG. 1) are performed to stably implement each radiator 102 and 104 in the antenna, and two to connect the power cable 130 to the power divider 120. Soldering is performed. In conclusion, a total of 12 solders are performed.

In FIG. 1, when the fragment wave is implemented, 22 solders are required to implement the double wave.

That is, due to the large number of soldering process, the manufacturing process time of the antenna increases and the manufacturing cost increases.

In addition, since the feed line 118 had to be soldered to the feed 116, the radiator 102 or 104 had to be plated with an alloy of copper and tin for the soldering.

In summary, high cost is required to implement the antenna and manufacturing process time may be increased.

In addition, the antenna has no method of adjusting the beam pointing error, the beam tracking error, and the polarization isolation.

It is an object of the present invention to provide an antenna having excellent electrical properties, in particular an antenna comprising an unplated radiator while reducing manufacturing costs and time.

In order to achieve the above object, an antenna according to an embodiment of the present invention includes a reflection plate; An insulation unit arranged on one surface of the reflector; A first radiator positioned over the insulator and having a feed part, a first radiating member connected to the feed part, a first balun part, and a second radiating member connected to the first balun part; A second radiator positioned over the insulator and having a second feed part, a third radiating member connected to the second feed part, a second balun part, and a fourth radiating member connected to the second balun part; And a power divider positioned on one surface of the reflector. Here, a first space is formed in the first feed part, a first feed line is arranged in the first space, a third space is formed in the second feed part, and a second feed line is the third space. And the first feed line and the second feed line are electrically connected to the inner conductor of the power cable through the power divider.

Antenna according to another embodiment of the present invention is a reflector; A first insulating part and a second insulating part arranged on one surface of the reflecting plate; And a first radiator positioned over the first insulating part and having a first feed part, a first radiating member connected to the first feed part, a first balun part, and a second radiating member connected to the first balun part; A second radiator positioned over the second insulating portion and having a second feed portion, a third radiating member connected to the second feed portion, a second balun portion, and a fourth radiating member connected to the second balun portion; And a power divider positioned on one surface of the reflector. Here, a first space is formed in the first feed part, a first feed line is arranged in the first space, a third space is formed in the second feed part, and a second feed line is the third space. And the first feed line and the second feed line are electrically connected to the inner conductor of the power cable through the power divider.

In the antenna according to the invention, the feed line is capacitively coupled rather than directly connected to the radiator. Therefore, it is not necessary to plate the radiator of the antenna, and as a result, the manufacturing cost and time of the antenna can be reduced.

In addition, since the radiators are located only on the upper surface of the reflector in the antenna, the portion to be soldered can be significantly reduced. Thus, the manufacturing cost and time of the antenna can be reduced.

In addition, the antenna may arrange choke members between radiators to achieve beam pointing errors, beam tracking errors, and interpolarization isolation within tolerance.

1 is a cross-sectional view showing a general antenna.
2 is a circuit diagram illustrating an antenna according to a first embodiment of the present invention.
3 is a perspective view showing the structure of an antenna according to an embodiment of the present invention.
4 is a perspective view illustrating an exploded structure of an antenna according to an embodiment of the present invention.
5 is a perspective view showing the structure of an antenna according to a second embodiment of the present invention.
6 is a top view illustrating the structure of the antenna of FIG. 5.
7 is a view showing the characteristics of the antenna of the present invention.
8 and 9 illustrate ± 45 ° polarization output from the antenna of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a circuit diagram illustrating an antenna according to a first embodiment of the present invention.

Referring to FIG. 2, the antenna of the present embodiment is, for example, an antenna used in a base station, and includes a reflector 200, a first radiator 202, a second radiator 204, an insulator 206, and a power divider 220. ) And a power cable 240.

Reflector 200 is made of a conductor, and serves as a reflector and ground. For example, the reflector 200 is connected to the outer conductor 244 of the power cable 240 to operate as ground.

The first radiator 202 is a device for generating a radiation pattern and includes two radiation members 210 and 212, a power supply 214, and a balloon 216 for a plurality of radiation members, for example, a fragment wave. And a first feed line 218. Of course, when implementing the double polarized wave, four radiating members, four feeding parts, and two feeding lines are required. However, it is assumed that the antenna generates the fragment wave for convenience of description below.

Although the power supply unit 214 is a power supply passage, although not shown in FIG. 2, the power supply unit 214 is provided with a first space (eg, a recess) in a longitudinal direction, that is, a direction perpendicular to the reflector 200. have.

The balloon portion 216 is a power supply passage and although not shown in FIG. 2, a second space is formed in the balloon portion 216.

The first feed line 218 is arranged in the first space of the feed portion 214 and the second space of the balun portion 216. That is, the first feed line 218 passes through the first space and is arranged in the second space. In particular, the first feed line 218 is not in physical contact with the feed portion 214 and the balloon portion 216, that is, is capacitively coupled with the balloon portion 216.

The second radiator 204 is an element that outputs a predetermined radiation pattern, and includes radiating members 230 and 232, a feeding part 234, a balloon 236, and a second feeding line 238. Here, since the structure and arrangement of the second radiator 204 are the same as the first radiator 202, the description thereof will be omitted.

The insulator 206 is an insulator and is arranged between the first radiator 202 and the reflector 200 and between the second radiator 204 and the reflector 200. That is, the first radiator 202 and the second radiator 204 are arranged on the same insulator 206. As a result, the first radiator 202 and the reflector 200 are capacitively coupled, and the second radiator 204 and the reflector 200 are capacitively coupled.

According to another embodiment of the present invention, the first radiator 202 may be arranged over the first insulator, and the second radiator 204 may be arranged over the second insulator. That is, there may be separate insulation to support the radiators 202 and 204.

The power divider 220 is arranged on the rear side of the reflector 200 and serves to distribute the power input from the outside, for example, the power input through the power cable 240 to the radiators 202 and 204. do. However, the structure of the power divider 220 is not particularly limited as long as it can distribute power.

Feed lines 218 and 238 are connected to a power divider 220 as shown in FIG. For example, feed lines 218 and 238 are each electrically connected to an end of a distribution line of power divider 220, and inner conductor 242 of power cable 240 is an input port of power divider 220. Leads to. As a result, the power input through the power cable 240 is distributed to the feed lines 218 and 238.

According to an embodiment of the present invention, the first feed line 218 penetrates the reflector plate 200 and the insulation portion 206 as shown in FIG. 2 to provide a space for the feed portion 214 and the balloon portion 216. Are arranged. Thus, holes through which the first feed line 218 can pass are formed on the reflecting plate 200 and the insulating portion 206, respectively. In addition, the second feed line 238 penetrates the reflecting plate 200 and the insulating portion 206 and is arranged in the spaces of the feed portion 234 and the balloon portion 236.

In summary, the antenna of the present invention has different characteristics from the conventional antenna.

First, in the conventional antenna, the radiator is arranged to penetrate from the upper surface of the reflector to the rear surface, but in the antenna of the present invention, the radiator 202 or 204 is located only on the upper surface of the reflector 200 without passing through the reflector 200. Since the characteristics of the antenna tend to be lowered as the holes of the reflector are larger, the characteristics of the antenna of the present invention may be superior to those of the conventional antenna.

Second, in the conventional antenna, the feed line is directly connected (soldered) to the feed section of the radiator. In this case, the radiator had to be plated with a plating material, for example, a compound of copper and tin, in order to solder the feed line to the feed section. As a result, plating costs and plating processes had to be additionally performed. However, in the antenna of the present invention, the feed line 218 or 238 is capacitively coupled to the balloon 216 or 236 without being directly connected to the balloon 216 or 236. That is, since the feed line 218 or 238 is not soldered to the balloon 216 or 236, there is no need to plate the radiator 202 or 204. Thus, the process of manufacturing the antenna can be simplified and the manufacturing cost can be reduced.

Third, in the conventional antenna structure, as shown in FIG. 1, at least 12 portions (parts indicated by dots) have to be soldered to implement the fragment wave, and at least 22 portions have to be soldered in the structure implementing the polarization wave. However, in the antenna of the present invention, as shown in FIG. 2, only four parts may be soldered to implement a fragment wave or only eight parts may be soldered to implement a double wave. That is, the soldered portion in the antenna of the present invention can be reduced by about 67% compared to conventional antennas. Thus, the cost due to the soldering can be reduced and the process time for performing soldering can be reduced.

In short, the antenna of the present invention can shorten the manufacturing process step and time compared to the conventional antenna, and can reduce the manufacturing cost. As a result, the antenna of the present invention can realize excellent electrical characteristics at low cost.

Although not described above, the antenna of the present invention implements broadband.

In addition, three or more radiators, for example, ten radiators may be sequentially arranged on the reflector plate 200. In this case, one power divider may be implemented to be electrically connected with the two radiators.

Hereinafter, a detailed structure of the antenna of the present invention will be described with reference to the accompanying drawings.

3 is a perspective view showing the structure of an antenna according to an embodiment of the present invention, Figure 4 is a perspective view showing an exploded structure of an antenna according to an embodiment of the present invention.

Referring to FIGS. 3A and 4A, the insulating portions 206A or 206B and the radiators 202 or 204 are sequentially arranged on the upper surface of the reflector 200.

Looking at the structure of the first radiator 202 with reference to Figure 3 (A), the first radiator 202 is a structure capable of outputting a polarized wave, for example, radiating members 210, 212 having a fan shape , 320 and 322, feed portions 214 and 330, and balloon portions 216 and 332. Here, the spaces 310, 314, 312 or 316 are formed in the feed portions 214 and 330 and the balloon portions 216 and 332, respectively, and the feed line 218 is the feed portion 214 and the balloon portion 216. ), And the feed line 300 is arranged into the spaces 314 and 316 of the feed portion 330 and the balloon 332. However, the feed lines 218 and 300 are arranged to cross each other as shown in FIG. 4B, but are not physically connected.

Since the second radiator 204 has a structure similar to the first radiator 202, a description thereof will be omitted.

The structure of the power divider 220 will be described with reference to FIGS. 3B and 4B. The power divider 220 includes a first support 360, a first input support 362, and a first distribution line ( 364 and a first input port 366, a second support 370, a second input support 372, a second distribution line 374, and a second input port 376.

The supports 360 and 370 are coupled with the reflector 200 such that the power divider 220 is stably coupled to the rear surface of the reflector 200.

The input supports 362 and 372 support the input ports 366 and 376.

Distribution lines 364 and 374 distribute the power supplied through power cable 240 and provide the distributed power to feed lines 218, 300, 238 and 340. Specifically, the feed line 218 is connected to one end of the first distribution line 364 and the feed line 300 is connected to one end of the second distribution line 374 as shown in FIG. 4B. The feed line 238 is connected to the other end of the first distribution line 364, and the feed line 340 is connected to the other end of the second distribution line 374. Of course, as long as the feed lines 218, 300, 238, and 340 are electrically connected to the distribution lines 364 and 374, the distribution structure can be variously modified.

A first power cable is connected to the first input port 366 and a second power cable is connected to the second input port 376. Here, the inner conductors of the power cables are electrically connected to distribution lines 364 and 374 through input ports 366 and 376. However, the outer conductors of the power cables are electrically connected to the supports 360, 362, 370 and 372, so that the reflector 200 physically connected to the supports 360 and 370 can operate as ground. .

5 is a perspective view showing the structure of an antenna according to a second embodiment of the present invention, Figure 6 is a top view showing the structure of the antenna of FIG. However, the same reference numerals are used for the same elements as those of the antenna of the first embodiment among the components of the antenna of the present embodiment.

5 and 6, the antenna of the present embodiment includes the reflector 200, the plurality of radiators 202 and 204, the insulation portions 206A and 206B, and the plurality of choke members 510, 512, and 514. Include.

Vertical members 500 and 502 may be formed at both ends of the reflector 200, and the vertical members 500 and 502 affect the front and rear ratio and the beam width of the antenna.

Choke members 510, 512, and 514 are arranged between radiation elements 202, 204, and the like.

According to one embodiment of the present invention, the choke members 510, 512, or 514 are spaced apart from the reflecting plate 200 by a predetermined distance, that is, capacitively coupled to the reflecting plate 200. In addition, the choke members 510, 512, or 514 are arranged to be spaced apart from the vertical members 500 and 502 by a predetermined distance.

Overall, for example, the radiator 204 is surrounded by choke members 512 and 514 and vertical members 500 and 502. In this case, the beam pointing error of the antenna can be improved.

According to another embodiment of the invention, it may be configured to surround the radiator 202 or 204 with only choke members. In this case, the choke members may be spaced apart from the reflector 200.

According to another embodiment of the present invention, as shown in FIG. 6, the middle line 602 of the choke members 510 and 512 may not coincide with the center line 600 of the radiator 202. That is, the distance between the choke member 510 and the centerline 600 of the radiator 202 may be different from the distance between the choke member 512 and the centerline 600 of the radiator 202. This is to adjust the beam pointing error and the beam tracking error of the antenna. That is, the antenna of the present invention adjusts the distance D1 between the middle line 602 of the choke members 510 and 512 and the center line 600 of the radiator 202 to adjust the beam pointing error and the beam tracking error. . In particular, since the beam pointing error and the beam tracking error may vary according to the inclination angle of the antenna, the center line 600 of the radiator 202 and the middle line 602 of the choke members 510 and 512 according to the inclination angle to be implemented. The interval D1 of is set appropriately.

Although only one radiator 202 has been mentioned above, the designs of the plurality of radiators and associated choke members may all be the same or some may be different.

According to another embodiment of the present invention, the antenna of the present invention adjusts the ratio of L1 and L2 and the distance between the choke members 510, 512 or 514 and the reflector 200 in FIG. 5. ) Can be controlled.

In summary, the antenna of the present exemplary embodiment installs choke members between the radiators on the reflector 200, adjusts the distance between the radiator and the corresponding choke members, and the distance between the reflector 200 and the choke member so that the beam pointing error, Control beam tracking error and isolation between the radiators.

Although not described above, the choke members 510, 512, and 514 may be supported by a plastic support (not shown) to be stably fixed without directly contacting the reflector 200. As a result, the reflective plate 200 and the choke members 510, 512, and 514 are not directly connected, and thus, a passive intermodulation distortion (PIMD) can be prevented.

In addition, as shown in FIG. 5, holes may be formed in lower portions of the choke members 510, 152, and 514.

Combining the antennas of the first and second embodiments, the antenna of the present invention can provide excellent antenna characteristics while being implemented at low cost, in particular, PIMD is prevented and beam pointing error, beam tracking error and isolation are within acceptable range. Can be adjusted accordingly.

7 is a view showing the characteristics of the antenna of the present invention, Figures 8 and 9 are views showing the ± 45 ° polarization output from the antenna of the present invention. Here, a characteristic experiment was conducted for an antenna in which ten radiators were sequentially arranged on a reflector and choke members exist between the radiators.

Referring to FIG. 7, the antenna of the present invention implements a desired frequency band, that is, a frequency band of 1710 MHz to 2170 MHz, and in particular, multiple bands may be implemented.

In addition, it can be confirmed through the S22 graph that the return loss in the frequency band of 1710MHz to 2170MHz is 20 Hz or more, and the S12 graph that the isolation between polarizations is 30 Hz or more.

That is, the antenna of the present invention may have excellent return loss characteristics and isolation characteristics while implementing a desired frequency band.

8 and 9, it can be seen that the horizontal half-angle beam width is 60 ° to 70 °, the horizontal beam directivity angle is ± 2 °, and the horizontal beam tracking ratio is less than 1.5 dB. That is, it is confirmed that the antenna of the present invention has a small beam tracking error within the allowable range.

The embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. Should be considered to be within the scope of the following claims.

00: reflector 202: first radiator
204: second radiator 206: insulation
210, 212, 230, 232: radiating member 214: feeding part
216: balloon portion 234: feeder
236 balun unit 218 first feed line
234: second feed line 220: power divider
240: power cable 300: feed line
310, 312, 314, 316: space 320, 322: radiation member
330, 332: radiation member 340: feed line
360, 370: support part 362, 372: input support part
364, 374: distribution line 366, 376: input port
500, 502: vertical member 510, 512, 514: choke member
600: center line 602: middle line

Claims (9)

Reflector;
An insulation unit arranged on one surface of the reflector;
A first radiator positioned over the insulator and having a first feed part, a first radiating member connected to the first feed part, a first balun part, and a second radiating member connected to the first balun part;
A second radiator positioned over the insulator and having a second feed part, a third radiating member connected to the second feed part, a second balun part, and a fourth radiating member connected to the second balun part; And
Including a power divider located on one surface of the reflector,
A first space is formed in the first feed part, a first feed line is arranged in the first space, a third space is formed in the second feed part, and a second feed line is arranged in the third space. And the first feed line and the second feed line are electrically connected to an inner conductor of a power cable through the power divider. The method of claim 1, wherein a hole is formed in each of the insulating portion and the reflecting plate corresponding to the first space, a second space is formed in the first balun portion, and the insulating portion is arranged on an upper surface of the reflecting plate, The first feed line extends in length from the rear side of the reflecting plate through the hole of the reflecting plate, the hole of the insulating portion, and the first space of the first feed portion, and into the second space of the first balun portion, the feed line Is capacitively coupled with the first balun. The antenna of claim 1, wherein the power divider is arranged on a rear surface of the reflector, and the reflector is electrically connected to an outer conductor of the power cable. The method of claim 1, wherein the first radiator is unplated, the insulating portion is arranged on the upper surface of the reflecting plate, the first radiator is not present on the rear surface of the reflecting plate, characterized in that located only on the upper surface side of the reflecting plate. Antenna. The method of claim 1, wherein a plurality of radiators and insulating parts are present on the reflecting plate,
Two radiators are arranged above one insulation, and two radiators are electrically connected to one power divider. The method of claim 5, wherein the first radiator, the second radiator and the third radiator which are sequentially arranged on the reflecting plate,
The antenna includes:
A first choke member positioned between the first radiator and the second radiator; And
Further comprising a second choke member positioned between the second radiator and the third radiator,
At least one of the first choke member and the second choke member is physically spaced apart from the reflecting plate. The method of claim 6, wherein the first vertical member and the second vertical member is formed on both sides of the reflecting plate,
At least one of the first choke member and the second choke member is capacitively coupled with the vertical members. 7. The antenna of claim 6 wherein the distance between the imaginary center line of the second radiator and the first choke member is different from the distance between the center line and the second choke member. Reflector;
A first insulating part and a second insulating part arranged on one surface of the reflecting plate;
A first radiator positioned over the first insulating portion and having a first feed portion, a first radiating member connected to the first feed portion, a first balun portion, and a second radiating member connected to the first balun portion;
A second radiator positioned over the second insulating portion and having a second feed portion, a third radiating member connected to the second feed portion, a second balun portion, and a fourth radiating member connected to the second balun portion; And
Including a power divider located on one surface of the reflector,
A first space is formed in the first feed part, a first feed line is arranged in the first space, a third space is formed in the second feed part, and a second feed line is arranged in the third space. And the first feed line and the second feed line are electrically connected to an inner conductor of a power cable through the power divider.

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