KR101053105B1 - Broadband Antenna Using Tubular Matching - Google Patents

Abstract

The present invention relates to a wideband antenna using tubular matching. The antenna includes an impedance matching / feeding unit and a first radiating member electrically connected to the impedance matching / feeding unit. Here, the impedance matching / feeding unit has a predetermined length and includes a first matching member connected to the ground and a second matching member connected to the feed point, and the second matching member has a structure surrounding the first matching member. The first radiating member has an electrical connection with the first matching member.

Antenna, matching, feeding, impedance

Description

BROADBAND ANTENNA FOR MATCHING IMPEDANCE USING A TUBE-TYPE ELEMENT}

The present invention relates to an antenna, and more particularly to a broadband antenna using tubular matching.

Recently, multi-band services are required for mobile communication terminals to service many frequency bands. For example, CDMA service of 824 ~ 894MHz band commercially available in Korea, PCS service of 1750 ~ 1870MHz band commercially, CDMA service of 832 ~ 925MHz band commercially available in Japan, PCS service of 1850 ~ 1990MHz band commercially available in USA, Europe There is a need for a mobile communication terminal capable of providing services using various frequency bands such as GSM service of 880 ~ 960MHz band commercially available in China and DCS service of 1710 ~ 1880MHz band commercially available in some parts of Europe. In addition, there is a demand for a composite terminal capable of using services such as Bluetooth, Zigbee, WLAN, GPS, and the like.

In order to support such a multi-band service, the mobile communication terminal must be provided with a broadband antenna that can satisfy the frequency bands. In general, a helical antenna and a Planar Inverted F Antenna (PIFA) are mainly used as antennas for supporting the multi-band service.

The helical antenna is used together with a monopole antenna as an external antenna fixed to the top of the mobile communication terminal. In this case, when the antenna is extended from the main body of the mobile communication terminal, the antenna operates as a monopole antenna, and when the antenna is extended into the main body, the antenna operates as a λ / 4 helical antenna.

Such a helical antenna has an advantage of obtaining a high gain, but has a disadvantage in that SAR characteristics, which are harmful standards for electromagnetic waves, are not good due to non-directionality. In addition, since the helical antenna protrudes to the outside of the mobile communication terminal, there is a disadvantage that it may be inconvenient to carry the mobile communication terminal and may not be beautiful.

The inverted-F antenna is an antenna designed to have a low profile structure to overcome the disadvantage of the helical antenna. Specifically, in the inverted-F antenna, the beam output in the direction of the ground plane among all the beams radiated from the radiator is induced back to the radiator by the ground plane. As a result, the beam directed to the human body can be attenuated, thus improving SAR characteristics. In addition, since the beam is induced again from the ground plane to the radiator, the directivity of the beam from the radiator to the outside can be improved. As a result, the length of the planar radiator having a rectangular shape can be reduced in half, so that the inverted-F antenna can operate as a rectangular microstrip antenna, thereby realizing a low profile structure.

However, the inverted-F antenna has the advantage that the directivity and the like is improved while having a narrow frequency band when providing a multi-band (wideband) service.

Therefore, there is a need for an antenna capable of overcoming narrow band characteristics, which is a disadvantage of the inverted-F antenna, while having a low profile structure for more stable operation in a multi-band (wide band).

An object of the present invention is to provide an antenna that implements a broadband through an impedance matching / feeding unit using a coupling scheme.

In order to achieve the above object, a broadband antenna according to an embodiment of the present invention includes an impedance matching / feeding unit; And a first radiating member electrically connected to the impedance matching / feeding unit. The impedance matching / feeding unit may include a first matching member having a predetermined length and connected to ground, and a second matching member connected to a feeding point, and the second matching member surrounds the first matching member, The first radiating member is electrically connected to the first matching member.

The first matching member and the second matching member perform impedance matching through coupling.

The distance between the first matching member and the second matching member is partially different.

The first matching member has a bent structure, and a portion of the second matching member corresponding to the first matching member may be bent in correspondence with the bending structure of the first matching member.

First protrusions protrude from the first matching member, second protrusions protrude from the second matching member, and the first protrusions and the second protrusions are spaced apart from each other, and the first protrusions and the first protrusions are spaced apart from each other. Some of the distances between the two protrusions may have different separation distances.

The second matching member has a polygonal shape or a cylindrical shape having a hole formed therein, and the first matching member has a structure inserted into a hole of the second matching member.

Broadband antenna according to another embodiment of the present invention is a substrate; An impedance matching / feeding unit coupled to the substrate and having a first matching member electrically connected to ground and a second matching member electrically connected to a feed point; And a first radiating member electrically connected to the impedance matching / feeding unit. The matching members may be arranged to be spaced apart from each other in a direction crossing the substrate, and a predetermined power may be supplied from the second matching member to the first matching member through a coupling method, and the second matching may be performed. A member is provided with a hole or recess, the first matching member is inserted into the second matching member, and the first radiating member is electrically connected to the first matching member.

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The distance between the first matching member and the second matching member is partially different.

The first matching member has a bent structure, and a portion of the second matching member corresponding to the first matching member is bent corresponding to the bent structure of the first matching member.

First protrusions protrude from the first matching member, second protrusions protrude from the second matching member, and the first protrusions and the second protrusions are spaced apart from each other, and the first protrusions and the first protrusions are spaced apart from each other. Some of the distances between the two protrusions have different separation distances.

Since the broadband antenna according to the present invention performs coupling matching through the impedance matching / feeding unit, there is an advantage in that the broadband characteristics can be realized.

In addition, the antenna of the present invention may be implemented in a structure capable of increasing the capacitive component, and may be less affected by external factors such as hand effects.

In addition, the antenna of the present invention may implement diversification of the capacitive component by varying some distances between the matching members of the impedance matching / feeding part.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals are used for like elements in describing each drawing.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. It should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

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

1 is a perspective view showing a broadband antenna according to a first embodiment of the present invention, Figure 2 is a perspective view showing an exploded structure of the antenna of Figure 1 according to an embodiment of the present invention.

The antenna of this embodiment is an antenna for serving a broadband and having a broadband, for example, embedded in a mobile communication terminal, and for example, may implement a GSM service band, a PCT service band, and a WCDMA service band.

Referring to FIG. 1, the antenna of this embodiment includes a substrate 100, a radiating member 102, an impedance matching / feeding unit 104, and a feeding point 106.

The substrate 100 is made of a dielectric material having a predetermined dielectric constant.

The radiation member 102 is electrically connected to the impedance matching / feeding unit 104 and outputs a specific radiation pattern when a predetermined power is supplied through the impedance matching / feeding unit 104.

The impedance matching / feeding unit 104 implements a broadband using a coupling method to solve the problem of the inverted F antenna having a narrow frequency band.

The impedance matching / feeding unit 104 is connected to the substrate 100, and the first matching member 200 is electrically connected to the ground of the substrate 100 as shown in FIGS. 2A and 2B. ) And a second matching member 202 electrically connected to the feed point 106.

The first matching member 200 is arranged in a direction perpendicular to the substrate 100 while being connected to the ground, and is fed from the second matching member 202 through a coupling method. Here, since the radiating member 102 is electrically connected to the first matching member 200 as shown in FIGS. 1 and 2, a predetermined power is supplied to the radiating member 102 through the second matching member 202. The power is supplied to output a specific radiation pattern from the radiation member 102.

The second matching member 202 is arranged to be spaced apart from the first matching member 200 by a predetermined distance while being electrically connected to the feed point 106. According to one embodiment of the present invention, the second matching member 202 may have a structure surrounding the first matching member 200, for example, a tubular structure, as shown in FIGS. 1 and 2. For example, the second matching member 202 may have a rectangular parallelepiped shape, a hole is formed in the center thereof, and the first matching member 200 may be inserted into the hole. Of course, the second matching member 202 may have various shapes such as a polygonal shape or a cylindrical shape other than a rectangular parallelepiped shape.

According to the present invention, coupling matching is performed between the first matching member 200 and the second matching member 202. Here, in the interaction between the first matching member 200 and the second matching member 202, the capacitive component among the capacitive component and the inductive component acts as a main element of the coupling matching. In particular, the antenna of the present embodiment smoothly performs impedance matching for wideband by varying capacitive components as described below.

Referring back to the structure of FIG. 1, the spacing between the first matching member 200 and the second matching member 202 may be all the same, but may be partially different. As such, if a part of the gap is set differently, the capacitive component between the matching members 200 and 202 is partially changed due to the gap difference. That is, the spacing between the matching members 200 and 202 may be partially set to vary the capacitive components of the matching members 200 and 202. Detailed description thereof will be described later with reference to the accompanying drawings.

The radiating member 102 is electrically connected to the first matching member 200 as mentioned above. Here, the frequency band of the antenna may be implemented by appropriately setting the length of the radiating member 102 and the length of the impedance matching / feeding unit 104.

In short, the antenna of the present embodiment implements the impedance matching / feeding unit 104 in a coupling manner. In particular, since the second matching member 202 in the impedance matching / feeding unit 104 has a structure surrounding the first matching member 200, the first matching member from the second matching member 202 during coupling feeding. The coupling amount fed to 200 may be increased than that in the antenna of the structure in which the matching members face each other, thereby enabling broadband implementation.

In FIGS. 1 and 2, the second matching member 202 is shown to completely surround the first matching member 200, but a part of the second matching member 202 has an open state and has a first matching structure. The member 200 may be surrounded. For example, there may be two parallel second matching members, and a first matching member may be positioned between the second matching members. In this case, the second matching members spaced apart from each other should be electrically connected to feeders, respectively, and the first matching members are also electrically connected to ground.

In addition, although the radiating member 102 is implemented to satisfy only one resonance frequency, the radiating member 102 may have various structures so as to implement a multi-band by itself.

Hereinafter, various methods for diversifying the capacitive components of the antenna will be described with reference to the accompanying drawings.

3 is a diagram schematically illustrating a broadband antenna according to a second embodiment of the present invention. 3 is a cross-sectional view of the impedance matching / feeding unit 104 cut in the vertical direction.

As shown in FIG. 3, in the impedance matching / feeding unit 104 of the antenna of this embodiment, a portion of the first matching member 200 located in the second matching member 202 may be bent.

Accordingly, the distance S1 between the unbent portion of the first matching member 200 and the second matching member 202 and the bent portion of the first matching member 200 and the second matching member 202 are described. The distance S2 is different. As a result, the capacitive component between the matching members 200 and 202 is partially different, that is, the capacitive component is diversified to satisfy the broadband characteristics.

3 illustrates that the first matching member 200 is bent only once, but may be bent more than once. In addition, the second matching member 202 may also be bent. That is, the bending structure of the matching members 200 and 202 of the impedance matching / feeding part 104 may be variously modified as long as some of the distances between the matching members 200 and 202 have different separation distances.

According to another embodiment of the present invention, the structure of the impedance matching / feeding unit 104 may be set differently so as to differently set a distance of a part of the distances between the first matching member 200 and the second matching member 202. It may be. For example, the first matching member 200 may be inserted into the hole of the second matching member 202, and the first matching member 200 may be arranged obliquely (in a diagonal direction) within the second matching member 202. Can be. As a result, the distances between the matching members 200 and 202 have different separation distances, so that the capacitive component can be diversified.

In other words, the wideband antenna of the present embodiment diversifies the capacitive component through a method of bending or diagonally arranging at least one of the matching members 200 and 202 of the impedance matching / feeding part 104.

4 is a diagram schematically illustrating a wideband antenna according to a third embodiment of the present invention. 5 to 7 are schematic diagrams illustrating an arrangement structure of protrusions according to an exemplary embodiment of the present invention. 4 to 7 illustrate only a part 202a of the second matching member 202, not the whole of the second matching member 202.

Referring to FIG. 4, in the antenna of the present embodiment, at least one first protrusion 400 protrudes from the first matching member 200, and at least one second protrusion 402 from the second matching member 202. Protrudes.

The first protrusions 400 and the second protrusions 402 are arranged at a predetermined distance apart, for example, cross each other.

These protrusions 400 and 402 have made the distance between the matching members 200 and 202 substantially close, resulting in the acquisition of larger capacitive components.

According to one embodiment of the present invention, the distances between the first protrusions 400 and the second protrusions 402 may all be the same, but some may have different separation distances. As a result, the capacitive component between the first matching member 200 and the second matching member 202 is partially different, and thus wideband matching is possible by diversifying the capacitive component.

Although not shown in FIG. 4, when the second matching member 202 has a rectangular parallelepiped shape, the second protrusions 402 may be formed on all of the inner surfaces of the rectangular parallelepiped, and the second matching member 202 may have a second shape only on some internal surfaces. Protrusions 402 may be formed.

In short, the antenna of the present embodiment performs wideband matching by varying capacitive components by forming protrusions 400 and 402 in the matching members 200 and 202, respectively. In particular, since the impedance matching / feeding part 104 has a larger capacitive component due to the protrusions 400 and 402, the antenna has less influence on external factors such as hand effects due to the large capacitance. Can be received.

In the above, the first protrusions 400 and the second protrusions 402 protrude from the first matching member 200 and the second matching member 202, respectively. However, the first protrusions 400 may protrude only from the first matching member 200, and the second protrusions 402 may not protrude from the second matching member 202. Of course, the second protrusions 402 may protrude only on the second matching member 202, and the first protrusions 400 may not protrude on the first matching member 200.

According to another embodiment of the present invention, as shown in FIG. 5, the lengths of the protrusions 400 and 402 are the same, but their width is partially different, so that the first protrusions 400 and the second protrusions 402 are different. Some of the distances between) may have different separation distances.

According to another embodiment of the present invention, the distances between the first protrusions 400 and the second protrusions 402 by varying the length of some of the protrusions 400 and 402 as shown in FIG. 6. Some of them may have different separation distances. Of course, the first protrusions 400 may all have the same length while some of the second protrusions 402 may have different lengths. In addition, while the second protrusions 402 all have the same length, some of the first protrusions 400 may be implemented to have different lengths. Even in this case, since some of the distances between the first protrusions 400 and the second protrusions 402 have different separation distances, the capacitive component can be diversified.

According to another embodiment of the present invention, as shown in FIG. 7, the protrusions 400 and 402 may have a structure other than rectangular.

In short, in the antenna of the present invention, the structure of the impedance matching / feeding unit 104 may be modified in various ways as long as the capacitive component can be diversified.

8 is a perspective view illustrating a broadband antenna according to a fourth embodiment of the present invention. However, since the broadband antenna of the present embodiment has a structure similar to that of FIG. 1, the same reference numerals are added to the same components.

Referring to FIG. 8, the antenna of the present embodiment includes a substrate 100, a first radiating member 102, a first matching member 200, a second matching member 202, a feed point 106, and a second radiating member. 800. That is, the antenna of this embodiment further includes a second radiating member 800 than in the antennas of other embodiments.

Since the remaining components except for the second radiating member 800 are the same as in the first embodiment, the description of the same components will be omitted.

The second radiating member 800 is arranged spaced apart from the first radiating member 102 and the impedance matching / feeding part 104, respectively.

The second radiating member 800 may have a shorter length than the first radiating member 102, in which case the second radiating member 800 implements a higher frequency band than the first radiating member 102. do.

According to an embodiment of the present invention, the second radiating member 800 may be electrically connected to the feed point 106 of the substrate 100 or may be electrically connected to the first matching member 200. That is, the second radiation member 800 is directly fed from the feed point 106.

According to another embodiment of the present invention, the second radiating member 800 is connected to the ground of the substrate 100 and is fed from the second matching member 202 of the impedance matching / feeding part 104 through a coupling scheme. I can receive it.

In the above, the second radiating member 800 has a straight rod shape, but may have other various shapes. For example, the second radiating member 800 may have a shape in which its end is bent. That is, the structure of the second radiating member 800 may be variously modified. In particular, the second radiating member 800 may have a structure that can implement a multi-band by itself.

In the first to third embodiments, the second radiating member is not present, but the second radiating member may be applied to the first to third embodiments.

In addition, although the antenna of the present embodiment does not have a bent or protruding structure, the bent and protruding structures of the first to third embodiments may also be applied to the antenna of the present embodiment.

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.

1 is a perspective view showing a broadband antenna according to a first embodiment of the present invention.

2 is a perspective view illustrating an exploded structure of the antenna of FIG. 1 according to an embodiment of the present invention.

3 is a diagram schematically illustrating a broadband antenna according to a second embodiment of the present invention.

4 is a diagram schematically illustrating a wideband antenna according to a third embodiment of the present invention.

5 to 7 are schematic diagrams illustrating an arrangement structure of protrusions according to an exemplary embodiment of the present invention.

8 is a perspective view illustrating a broadband antenna according to a fourth embodiment of the present invention.

Claims (11)

Impedance matching / feeding unit; And A first radiating member electrically connected to the impedance matching / feeding unit; The impedance matching / feeding unit has a predetermined length and includes a first matching member connected to ground and a second matching member connected to a feeding point, and the second matching member has a structure surrounding the first matching member, And the first radiating member is electrically connected to the first matching member. The broadband antenna of claim 1, wherein the first matching member and the second matching member perform impedance matching through coupling. 3. The wideband antenna of claim 2, wherein a distance between the first matching member and the second matching member is partially different. The method of claim 1, wherein the first matching member has a bent structure, and a portion corresponding to the first matching member of the second matching member is bent in correspondence with the bending structure of the first matching member. Broadband antenna. The method of claim 1, wherein first protrusions protrude from the first matching member, and second protrusions protrude from the second matching member. And the first protrusions and the second protrusions are spaced apart from each other, and some of the distances between the first protrusions and the second protrusions have different separation distances. The broadband antenna of claim 1, wherein the second matching member has a polygonal shape or a cylindrical shape having a hole formed therein, and the first matching member has a structure inserted into a hole of the second matching member. Board; An impedance matching / feeding unit coupled to the substrate and having a first matching member electrically connected to ground and a second matching member electrically connected to a feed point; And A first radiating member electrically connected to the impedance matching / feeding unit; The matching members are arranged to be spaced apart from each other in a direction crossing the substrate, and a predetermined power is supplied from the second matching member to the first matching member through a coupling method. A hole or recess is formed, the first matching member is inserted into the second matching member, and the first radiating member is electrically connected to the first matching member. delete 8. The broadband antenna of claim 7, wherein the distance between the first matching member and the second matching member is partially different. The method of claim 7, wherein the first matching member has a bent structure, and a portion of the second matching member corresponding to the first matching member is bent in correspondence with the bending structure of the first matching member. Broadband antenna. The method of claim 7, wherein first protrusions protrude from the first matching member, and second protrusions protrude from the second matching member. And the first protrusions and the second protrusions are spaced apart from each other, and some of the distances between the first protrusions and the second protrusions have different separation distances.

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