KR101599526B1 - Multi Polarization Dipole Antenna - Google Patents

Abstract

A multi-polarized dipole antenna is disclosed. The disclosed dipole antenna comprises: a first substrate; A second substrate coupled perpendicularly to the first substrate; A first dipole radiating element formed on the first substrate and including a first dipole element connected to a power supply and a second dipole element connected to a ground; A second dipole radiating element formed on the second substrate and including a third dipole element connected to the power supply and a fourth dipole element connected to the ground; And a plurality of parasitic elements spaced apart from the first dipole element to the fourth dipole element. According to the disclosed antenna, it is possible to secure broadband characteristics and to lower the level of the cross polarization ratio in the multi-polarization antenna.

Description

Multi Polarization Dipole Antenna}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna, and more particularly, to a multi-polarization dipole antenna used in a base station or the like.

Multipolar polarization dipole antennas are often used as radiating elements to support multi polarization in base station antennas. Here, the multi-polarizations mainly mean polarizations of +45 degrees and -45 degrees, and most mobile communication systems require that the base station antennas support polarizations of +45 degrees and -45 degrees.

The multipurpose dipole antenna is implemented in various structures and includes a first dipole element for supporting polarization of +45 degrees and a second dipole element for supporting polarization of -45 degrees.

The first dipole element and the second dipole element are connected to the feed point and ground, respectively, to radiate or receive RF signals.

As the services provided through base stations are diversified, the demand for broadband and multi - band antenna of base station antennas is continuously increasing. In particular, since recent base station antennas are required to transmit data at a high speed, ensuring the broadband characteristics for high-speed data transmission is becoming an important issue for base station antennas.

On the other hand, a cross-polarized wave is generated in a base station antenna supporting multi-polarization due to multi-polarization. Such a cross polarization ratio is a major factor for lowering the transmission / reception performance of the antenna.

The present invention provides a multi-polarization dipole antenna capable of securing a wide band characteristic.

Also, the present invention proposes a multi-polarization dipole antenna capable of lowering the level of the cross polarization ratio in a multi-polarization antenna.

According to an aspect of the present invention, there is provided a plasma display panel comprising: a first substrate; A second substrate coupled perpendicularly to the first substrate; A first dipole radiating element formed on the first substrate and including a first dipole element connected to a power supply and a second dipole element connected to a ground; A second dipole radiating element formed on the second substrate and including a third dipole element connected to the power supply and a fourth dipole element connected to the ground; And a plurality of parasitic elements spaced apart from the first dipole element to the fourth dipole element.

Wherein the plurality of parasitic elements are formed on a surface of a first parasitic element spaced apart from the first dipole element by a predetermined distance and a surface on which the first parasitic element is formed, And a second parasitic element electrically connected through the second parasitic element.

Wherein the plurality of parasitic elements are formed on the opposite surface of the third parasitic element and the third parasitic element formed on the same plane as the second dipole element by a predetermined distance, And a fourth parasitic element electrically connected through the second terminal.

 Wherein the plurality of parasitic elements are formed on the opposite surface of the fifth parasitic element and the fifth parasitic element formed on the same plane as the third dipole element by a predetermined distance, And a sixth parasitic element electrically connected through the second parasitic element.

Wherein the plurality of parasitic elements are formed on a surface opposite to a seventh parasitic element formed on the same plane as the fourth dipole element and spaced apart from the seventh parasitic element by a predetermined distance, And an eighth parasitic element electrically connected through the first and second parasitic elements.

The first substrate and the second substrate may have a T shape.

 The first dipole element may be formed on a front surface of the first substrate, and the second dipole element may be formed on a rear surface of the first substrate.

The third dipole element may be formed on a front surface of the second substrate, and the fourth dipole element may be formed on a rear surface of the second substrate.

The plurality of parasitic elements are preferably electrically connected.

According to another aspect of the present invention, there is provided a liquid crystal display comprising: a first substrate; A second substrate coupled perpendicularly to the first substrate; A first dipole radiating element formed on the first substrate and including a first dipole element connected to a power supply and a second dipole element connected to a ground, the first dipole radiating element emitting a signal of a first polarization; And a second dipole radiating element formed on the second substrate and including a third dipole element connected to the power feeding and a fourth dipole element connected to the ground and radiating a signal of a second polarized wave orthogonal to the first polarized wave; And a plurality of parasitic elements spaced apart from the first dipole element to the fourth dipole element, wherein the plurality of parasitic elements are electrically connected to each other.

According to the multi-polarization dipole antenna of the present invention, broadband characteristics can be ensured and the level of the cross polarization ratio can be lowered in the multi-polarization antenna.

1 is a perspective view of a multi-polarization dipole antenna according to an embodiment of the present invention;
2 illustrates a front and rear structure of a first substrate according to an embodiment of the present invention.
3 illustrates a front and rear structure of a second substrate according to an embodiment of the present invention.
4 illustrates a soldering region for electrically connecting parasitic elements;
5 is a view showing a current direction of a parasitic element when operating in a dipole antenna according to an embodiment of the present invention when the polarization is operated at +45 degrees.
FIG. 6 is a view showing a current direction of parasitic elements when operating with a polarization of -45 degrees in a dipole antenna according to an embodiment of the present invention; FIG.
7 is a graph showing return loss of a dipole antenna according to an embodiment of the present invention.
8 is a view showing a radiation pattern of a dipole antenna according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

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

1 is a perspective view of a multi-polarization dipole antenna according to an embodiment of the present invention.

Referring to FIG. 1, a polarized dipole antenna according to an exemplary embodiment of the present invention includes two substrates 100 and 110 which intersect with each other. The first substrate 100 and the second substrate 110 have a substantially T shape and are joined at an angle of 90 degrees with respect to each other, and the intersection points may be the center portions of the substrates 100 and 102.

Due to such a cross structure, the combination of the first substrate 100 and the second substrate 110 has a cross structure. Although the first substrate 100 and the second substrate 110 are separately defined for convenience of explanation, the first substrate 100 and the second substrate 110 may be implemented as one integrated substrate Will be apparent to those skilled in the art.

The first dipole radiating element 120 and the second dipole radiating element 130 are formed on the first substrate 100, the second substrate 110, and the second substrate, respectively. The first dipole radiating element 120 formed on the first substrate 100 emits an RF signal having a polarization of +45 degrees. In addition, the second dipole radiating element 130 formed on the second substrate 110 radiates an RF signal having a polarization of -45 degrees.

The first dipole radiating element 120 and the second dipole radiating element 130 are coupled to the first and second substrates 100 and 110 in the form of a metal pattern, . For example, various schemes such as etching, conductive ink printing, direct bonding, etc. may be used.

The first and second dipole radiating elements 120 and 130 formed on the combined body of the first substrate 100 and the second substrate 110 independently emit signals having a polarization difference of 90 degrees with respect to each other.

The antenna of the present invention including the first dipole radiating element 120 and the second dipole radiating element 130 can be used for a base station antenna as an example. The antenna of the present invention can be used as a radiator arranged in a base station antenna to provide a polarized wave signal.

2. Description of the Related Art In recent years, a base station antenna of a mobile communication system has required broadband characteristics for high-speed transmission of data, and it has been difficult to secure broadband characteristics for high-speed transmission only by a general dipole radiating element. The present invention proposes a dipole antenna structure capable of radiating a signal, and a structure for securing a wide band characteristic in the present invention will be described in detail below.

FIG. 2 is a front and a rear view of a first substrate according to an embodiment of the present invention. FIG. 3 is a front and a rear view of a second substrate according to an embodiment of the present invention.

2 and 3, (a) is a view showing a front surface of the first and second substrates, and (b) is a view showing the rear surfaces of the first and second substrates.

As shown in FIGS. 2 and 3, the dipole radiating elements of the same structure are coupled to the first substrate 100 and the second substrate 110.

Referring to FIG. 2, a first dipole radiating element 120 coupled to a first substrate 100 includes a first dipole element 122 and a second dipole element 124. The first dipole element 122 is an element that is electrically connected to the feed in the first dipole radiating element 120 and the second dipole element 124 is an element that is electrically connected to ground in the first dipole radiating element 120. [ to be.

The first dipole element 122 is formed in the left region of the front surface of the first substrate 100. As shown in FIG. 2, the first dipole element 122 may have a Half-T shape, but is not limited thereto.

The second dipole element 124 is formed on the right side region of the rear surface of the first substrate 100. The second dipole element 124 may also have a Half-T shape.

2, the first dipole element 122 and the second dipole element 124 are formed on different surfaces, but the first dipole element 122 and the second dipole element 124 are formed on the first substrate 122, May be formed on the same side of the substrate 100 as shown in FIG.

A feed pattern 200 is formed on the front surface of the first substrate 100 and the feed pattern 200 is coupled with the first dipole element 122 to provide a feed signal to the first dipole element 122. Of course, the feed to the first dipole element 122 may be provided through a cable or the like without using the feed pattern 200, and in this case, the feed pattern 200 need not be formed.

The first parasitic element 300 is coupled to the front surface of the first substrate 100 by being spaced apart from the first dipole element 122 on the first dipole element 122. The first parasitic element 300 may have a line shape but is not limited in shape, and any structure may be employed as long as it can form the parasitic capacitance by the first dipole element 122 and the electromagnetic coupling.

A second parasitic element 302 is formed on the opposite (rear) surface of the first substrate on which the first parasitic element 300 is formed, corresponding to the position of the first parasitic element. The second parasitic element 302 is electrically connected to the first parasitic element through a through hole formed in the first substrate. The shape of the second parasitic element 302 is preferably the same as that of the first parasitic element 300, but may have a shape different from that of the first parasitic element 300 according to a required bandwidth characteristic.

A third parasitic element 304 is coupled to the rear surface of the first substrate 100 so as to be separated from the second dipole element 124 on the second dipole element 124. The shape of the third parasitic element 304 is preferably the same as that of the first parasitic element 300, but may have a different form from that of the first parasitic element 300 in order to secure a desired bandwidth.

A fourth parasitic element 306 is formed on the front surface (front surface) of the rear surface of the first substrate on which the third parasitic elements 304 are formed, corresponding to the third parasitic elements 304. The third parasitic element 304 and the fourth parasitic element 304 are electrically connected through a through hole.

Referring to FIG. 3, the second dipole radiating element 130 coupled to the second substrate 102 includes a third dipole element 132 and a fourth dipole element 134. The third dipole element 132 is an element that is electrically connected to the feed in the second dipole radiating element 130 and the fourth dipole element 134 is an element that is electrically connected to ground in the second dipole radiating element 130. [ to be.

The structure and function of the third dipole element 132 and the fourth dipole element 134 are the same as those of the first dipole element 122 and the second dipole element 124, respectively.

The fifth parasitic element 308 is coupled to the front surface of the second substrate 102 so as to be spaced apart from the third dipole element 134 on the third dipole element 132. A sixth parasitic element 310 is formed on the front side (rear side) of the second substrate on which the fifth parasitic elements 308 are formed, corresponding to the positions of the fifth parasitic elements 308. The fifth parasitic element 308 and the sixth parasitic element 310 are electrically connected through the through hole.

The seventh parasitic element 312 is coupled to the rear surface of the second substrate 102 by being spaced apart from the fourth dipole element 134 on the fourth dipole element 134. An eighth parasitic element 314 is formed on the rear surface (front surface) of the second substrate on which the seventh parasitic element 312 is formed, corresponding to the position of the seventh parasitic element 312. The seventh and eighth parasitic elements 312 and 314 are electrically connected through the through holes.

The parasitic elements 300, 302, 304, 306, 308, 310, 312, and 314 formed in the first substrate 100 and the second substrate 102 are additionally formed to secure broadband characteristics of the dipole antenna. Element. The dipole elements 122,124, 132,134 and the parasitic elements 300,302, 304,306, 306,308,310, 312,304 of the first dipole radiating element 120 and the second dipole radiating element 130, 314, and it is possible to obtain a wider bandwidth through the electromagnetic coupling.

It is preferred that the parasitic elements 300, 302, 304, 306, 308, 310, 312, 314 have the same shape, but their shape may vary according to the required bandwidth.

The parasitic elements 300, 302, 304, 306, 308, 310, 312, and 314 are electrically connected to each other through the through-holes formed between the opposing parasitic elements. To this end, the parasitic elements may be electrically connected by soldering to the intersection regions of the first substrate 100 and the second substrate 102.

4 is a view showing a soldering region for electrically connecting the parasitic elements. In Fig. 4, it is possible to perform soldering to the A region, and electrically connect all the parasitic elements through soldering.

Electrically connected parasitic elements have the effect of lowering the level of cross polarization and ultimately improving the cross polarization ratio (CPR). When the first dipole radiating element 120 emits a signal of +45 degrees polarization, the parasitic elements suppress the magnitude of the polarization signal of the other angle.

Also, when eight parasitic elements are electrically connected, the parasitic elements do not affect the polarization angle of each dipole radiative element.

5 is a diagram illustrating the current direction of the parasitic elements when the dipole antenna according to the embodiment of the present invention is operated with a polarization of +45 degrees.

In Fig. 5, arrow 500 is the +45 degree polarization direction and the other arrows are the current direction of each parasitic element. In Fig. 5, the currents of the respective parasitic elements are canceled or reinforced by vector synthesis. At this time, the components in the -45 degree direction are canceled and the components in the +45 degree direction are reinforced. As a result of the vector synthesis, the current direction is oriented at +45 degrees, and thus the polarization direction of +45 degrees is not disturbed.

FIG. 6 is a diagram illustrating a current direction of a parasitic element when operating at -45 degrees polarization in a dipole antenna according to an embodiment of the present invention.

Referring to FIG. 6, arrow 600 is the -45 degree polarization direction and the other arrows are the current direction of each parasitic element. In Fig. 6, the currents of the respective parasitic elements are canceled or reinforced by vector synthesis, and only components in the -45 direction are left through the vector synthesis.

7 is a graph illustrating return loss of a dipole antenna according to an embodiment of the present invention.

Fig. 7 shows the reflection loss when a parasitic element is included and the reflection loss when a parasitic element is included. Referring to FIG. 7, it can be seen that, when a parasitic element is included, the radiation band of the antenna is extended compared to the case where the parasitic element is not included, so that broadband characteristics can be secured. Also, referring to FIG. 7, it can be seen that the parasitic elements provide better impedance matching.

8 is a view showing a radiation pattern of a dipole antenna according to an embodiment of the present invention.

Fig. 8 shows the radiation pattern when the parasitic element is included and the radiation pattern when the parasitic element is not included.

Referring to FIG. 8, it can be seen that when the parasitic elements are not included, the level of the cross polarization radiation pattern is lowered, and thus the CPR (Cross Polarization Ratio) can be improved.

It will be apparent to those skilled in the art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. Should be regarded as belonging to the following claims.

Claims (10)

A first substrate;
A second substrate coupled perpendicularly to the first substrate;
A first dipole radiating element formed on the first substrate and including a first dipole element connected to a power supply and a second dipole element connected to a ground;
A second dipole radiating element formed on the second substrate and including a third dipole element connected to the power supply and a fourth dipole element connected to the ground; And
And a plurality of parasitic elements spaced apart from the first dipole element to the fourth dipole element,
Wherein the plurality of parasitic elements comprise:
A first parasitic element formed on the same plane as the first dipole element and spaced apart from the first parasitic element by a predetermined distance, a second parasitic element formed on the opposite surface of the first parasitic element and electrically connected to the first parasitic element through the through hole, A second parasitic element, a third parasitic element formed on the same plane as the second dipole element at a predetermined distance, a third parasitic element formed on the opposite surface of the third parasitic element and electrically connected to the third parasitic element through the through hole, A fourth parasitic element connected to the fourth parasitic element, a fifth parasitic element formed on the same plane as the third dipole element by a predetermined distance, and a fourth parasitic element formed on the opposite surface of the fifth parasitic element, A sixth parasitic element electrically connected through the hole. A seventh parasitic element formed on the same plane as the fourth dipole element and spaced apart from the seventh parasitic element by a predetermined distance, and a third parasitic element formed on the opposite surface of the seventh parasitic element, 8 parasitic elements,
Wherein the plurality of parasitic elements are electrically connected to each other.
delete delete delete delete The method according to claim 1,
Wherein the first substrate and the second substrate are T-shaped. The method according to claim 1,
Wherein the first dipole element is formed on a front surface of the first substrate and the second dipole element is formed on a rear surface of the first substrate. 8. The method of claim 7,
Wherein the third dipole element is formed on a front surface of the second substrate and the fourth dipole element is formed on a rear surface of the second substrate.






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