KR101700560B1 - A quadrifilar antenna including a reflector - Google Patents

Abstract

The present invention relates to a quadrifilar antenna including a reflector. According to an embodiment, the quadrifilar antenna includes: a main body having a plurality of radiation devices; and a reflector which is located on the lower part of the main body, and reflects or diffracts signals radiated from the plurality of radiation devices.

Description

A QUADRIFILAR ANTENNA INCLUDING A REFLECTOR < RTI ID = 0.0 >

The following embodiments relate to a quadrifilariler antenna including a reflector.

A quad refiller antenna is a type of antenna used for satellite communication in a device such as a mobile communication terminal or a GPS receiver. The quadrifiller antenna is designed to provide circularly polarized radiation and have a quarter-wave or half-wave structure with shorted ends.

The quadrifilarian antenna is an electric micromanipulator for providing circular polarization in each region of the blog. The quadrifilariler antenna is generally composed of four helices, each helical being formed identically on the circumferential surface of a dielectric cylinder or dielectric disk support, and four phase-shifted signals of the same amplitude are fed do.

In order to improve the refraction of the quad refiller antenna, the quad refiller antenna is changed into a conical cylinder shape and the pitch of the helix is changed. However, the height of the quad refiller antenna is increased or the manufacturing of the antenna is limited.

Embodiments provide a technique for improving the axial angle of a quadrupole refractor antenna by implementing a reflector for at least one of reflection and diffraction of signals radiated from the plurality of radiating elements at a lower end of a main body having a plurality of radiating elements formed thereon can do.

The quad refiller antenna according to one embodiment includes a main body having a plurality of radiating elements formed therein and a reflector positioned at a lower end of the main body for at least one of reflection and diffraction of signals radiated from the plurality of radiating elements can do.

The reflector may include a first surface and a second surface at a first angle with the first surface.

The second surface may be in the form of a cone.

The first angle may be 90 degrees or less.

The reflector may further include a third surface at a second angle with the second surface.

The second surface may be in the form of a cylinder, and the third surface may be in the form of a cone.

The first angle and the second angle may be less than 90 degrees, and the second angle may be less than the first angle.

The antenna may further include a power feeding circuit for feeding the plurality of radiating elements, and the power feeding circuit may be implemented inside the reflector.

1 is a schematic structural view of a quadrifilariler antenna according to an embodiment.
Fig. 2 is a schematic structural view of an example of the reflector shown in Fig.
3 is a view for explaining reflection and diffraction of a signal by the reflector shown in Fig.
FIG. 4A is an example of a graph for explaining the axial ratio characteristics of a quadrifilariler antenna improved through the reflector of FIG. 2. FIG.
FIG. 4B is another example of a graph for explaining the axial ratio characteristics of a quadrifilariler antenna that is improved through the reflector of FIG. 2. FIG. 5 is a schematic structural view of another example of the reflector shown in FIG.
6 is a graph illustrating an axial ratio characteristic of a quadrifilariler antenna improved through the reflector of FIG.

It is to be understood that the specific structural or functional descriptions of embodiments of the present invention disclosed herein are presented for the purpose of describing embodiments only in accordance with the concepts of the present invention, May be embodied in various forms and are not limited to the embodiments described herein.

Embodiments in accordance with the concepts of the present invention are capable of various modifications and may take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. It should be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms disclosed, but includes all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

The terms first, second, or the like may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example without departing from the scope of the right according to the concept of the present invention, the first element being referred to as the second element, Similarly, the second component may also be referred to as the first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Expressions that describe the relationship between components, for example, "between" and "immediately" or "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, it is to be understood that the terms such as "comprise" or "comprise ", and the like, , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

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 to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the patent application is not limited or limited by these embodiments. Like reference symbols in the drawings denote like elements.

1 is a schematic structural view of a quadrifilariler antenna according to an embodiment.

Referring to FIG. 1, a quadrifilar antenna 100 may include a plurality of radiating elements 110, a main body 130, and a reflector 150. In addition, the quadrifilariler antenna 100 may further include a power supply circuit 170.

The quadrifilariler antenna 100 may be implemented in a Radio Frequency Identification (RFID), a Global Positioning System (GPS), a satellite, or the like. In addition, the quadrifilariler antenna 100 may be implemented in a personal computer (PC), a data server, or a portable electronic device.

The portable electronic device may be a laptop computer, a mobile phone, a smart phone, a tablet PC, a mobile internet device (MID), a personal digital assistant (PDA), an enterprise digital assistant ), A digital still camera, a digital video camera, a portable multimedia player (PMP), a personal navigation device or a portable navigation device (PND), a handheld console, e-book, or a smart device. For example, a smart device can be implemented as a smart watch or a smart band.

The plurality of radiation elements 110 may emit radiation signals in response to the feed signals transmitted from the feed circuit 170. The plurality of radiating elements 110 may be electrically connected to the power feeding circuit 170.

A plurality of radiating elements 110 may be formed in the main body 130. For example, the plurality of radiating elements 110 may be formed in a helix structure. In addition, the plurality of radiating elements 110 may be formed in various shapes such as a straight line, an oblique line, and the like. At this time, the plurality of radiating elements 110 are electrically connected, and the spacing between the plurality of radiating elements can be constant.

The plurality of radiating elements 110 may be formed by plating or printing a radiation pattern on the main body 130, or may be formed by plating, printing, or injection after forming a radiating pattern at an embossed position.

The main body 130 may be formed in various shapes such as a cylindrical shape, a square shape, and a polygonal shape. In addition, the main body 130 may be implemented through various media such as a dielectric, a PCB, an air, and a ceramic.

The reflector 150 is located at the lower end of the main body 130 and can reflect or diffract the radiation signals emitted from the plurality of radiating elements 110. That is, the reflector 150 may be for at least one of the half-time and the diffraction of the radiation signals emitted from the plurality of radiation elements 110.

The quadrifilariler antenna 100 can be extended in the axial ratio characteristic, for example, the axial nonlinearity, through the reflector 150. By improving the axial ratio characteristics of the quadrifilariler antenna 100, the radiation pattern and / or gain of the quadrifilariler antenna 100 can be improved.

In addition, since the height of the main body 130 in which the plurality of radiating elements 110 are implemented can be reduced, the quadrifilariler antenna 100 can be miniaturized. Therefore, the production cost of the quadrifilariler antenna 100 can also be reduced.

The power feeding circuit 170 may transmit the power feeding signals to the plurality of radiating elements 110. [ That is, the power feeding circuit 170 can feed the plurality of radiating elements 110 through the power feeding signals. For example, the feed signals may be signals having a phase difference.

The feed signals may be generated from the feed circuit 170, but are not necessarily limited thereto. For example, the feed signals may be power (or current, voltage) supplied from the outside. That is, the power supply circuit 170 may supply power to the radiating elements 110, for example, power supply signals from the outside.

The power supply circuit 170 may be implemented inside the reflector 150. Thus, the quadrifilariler antenna 100 can be miniaturized.

Fig. 2 is a schematic structural view of an example of the reflector shown in Fig. 1, Fig. 3 is a view for explaining reflection and diffraction of a signal by the reflector shown in Fig. 2, FIG. 4B is an example of a graph for explaining the axial ratio characteristics of a quadrifilar filter antenna improved through the reflector of FIG. 2. FIG.

Referring to FIGS. 2 to 4B, the reflector 150 may include a first plane 151 and a second plane 153. The first surface 151 may refer to the upper surface of the reflector 150 and the second surface 153 may refer to the side surface of the reflector 150.

The first surface 151 may form a first angle? W with the second surface 153. That is, the reflector 150 may be configured such that the first surface 151 and the second surface 153 form a first angle? W.

The second surface 153 may be implemented in a conical shape, and the first angle? W may be 90 degrees or less.

When the first angle? W formed by the first surface 151 and the second surface 153, that is, the wedge angle is 90 degrees or less, the axial ratio characteristics of the quadrifilariler antenna 100 may be good. The reflector 150 may be implemented in a cylindrical or conical shape. That is, although the reflector 150 is shown in a conical shape in FIG. 2, the reflector 150 is not necessarily limited to this, and the reflector 150 may be realized in a cylindrical shape.

3, the back radiation of the quadrifilariler antenna 100 is simplified for convenience of explanation of radiation and diffraction of a source (e.g., a signal) by the reflector 150. FIG. 3, the source has a height equal to the height of the quadrant refiller antenna 100, for example, the height (H_A) of the main body 130 in which the plurality of radiating elements 110 are formed. And may be incident on the first surface 151. The source may refer to a radiation signal emitted from a plurality of radiating elements 110. At this time, the observation points of the reflection shadow region, the incident shadow region, and the reflected field in the quadrifilariler antenna 100 can be determined according to the incident angle [theta] i of the source and the radius R_U of the reflector 150. [ The radius R_U of the reflector 150 means the radius of the first surface 151. Further, the magnitude and direction of the diffraction wave can be determined according to the incident angle [theta] i of the source and the first angle [theta] w which is the wedge angle.

The wedge angular first angle? W can be expressed by Equation (1).

The incident angle? I at which the backward field is incident on the reflector 150 can be expressed by Equation (2).

For example, when the radius R_U of the first surface 151 is equal to the radius R_L of the second surface 153, the first angle? W is 90 degrees. At this time, the reflector 150 may be a cylindrical reflector.

As shown in FIG. 4A, the incident angle [theta] i of the backward radiation incident from the quadrifilariler antenna 100 becomes smaller as the radius R_U of the first surface 151 increases, and as a result, When the radius R_L of the second surface 153 decreases, the first angle? 1 decreases to 90 degrees or less when the radius R_L of the second surface 153 decreases . At this time, the reflector 150 may be a cone-shaped reflector.

As shown in Fig. 4B, the axial ratio due to the diffraction wave can be improved as the first angle [theta] 1 of the reflector 150 is reduced. In particular, it can be confirmed that the axial ratio by the diffraction wave is significantly improved at the first angle? W of 80 degrees. The radius R_U of the reflector 150 must be greater than the height H_A of the quadrifilariler antenna 100 for the purpose of improving the axial ratio but the first angle w that is the wedge angle is smaller It can be seen that the axial ratio of the quadrifilariler antenna 100 can be improved.

The incident angle i of the backward radiation incident from the quadrifilariler antenna 100 becomes smaller as the radius R_U of the first surface 151 increases and accordingly the reflection area becomes wider, It can be seen that the shaft angle increases.

FIG. 5 is a schematic structural view of another example of the reflector shown in FIG. 1, and FIG. 6 is a graph for explaining the axial ratio characteristics of a quadrifilariler antenna improved through the reflector of FIG.

Referring to FIGS. 5 and 6, the reflector 150 may include a first plane 151, a second plane 153, and a third plane 155. The first surface 151 refers to the upper surface of the reflector 150 and the second surface 153 and the third surface 155 can refer to the side surface of the reflector 150. [ At this time, the second surface 153 may be located at the upper portion and the third surface 155 may be located at the lower portion.

The first surface 151 may form a first angle? W with the second surface 153. The second surface 153 may form a second angle? W 'with the third surface 155. That is, the reflector 150 is formed such that the first surface 151 forms a first angle? W with the second surface 153 and the second surface 153 forms a second angle? W 'with the third surface 155, ). The first angle? W and the second angle? W 'may be 90 degrees or less, and the second angle? W' may be less than the first angle? W.

For example, the second surface 153 may be cylindrical and the third surface 155 may be conical. The first angle? W may be vertical (e.g., 90 degrees) (? w ') may be 90 degrees or less. That is, the reflector 150 may be realized by combining a cylindrical shape and a conical shape.

The axial ratio characteristic of the quadrifilariler antenna 100 may be good when the second angle? W 'formed by the second surface 153 and the third surface 155, that is, the wedge angle is 90 degrees or less.

The wedge angular second angle [theta] w 'can be expressed by Equation (3).

When the height H_M of the second surface 153 is 0, the reflector 150 shown in FIG. 5 is the same as the conical half period 150 shown in FIG. 2, but the height of the second surface 153 The second angle? W 'may decrease as the number H_M increases.

At this time, the first diffraction occurs at the first surface 151 of the reflector 150 and the second surface 153 and the third surface 155 meet by the field that flows along the second surface 153 A second order diffraction may occur where a wedge, i.e., a second angle? W 'occurs. The source may refer to a radiation signal emitted from a plurality of radiating elements 110.

As shown in Fig. 6, the axial ratio by the diffraction wave can be improved as the height H_M of the second surface 153 increases and the second angle? W ', which is the wedge angle, decreases. In particular, it can be seen that the axial ratio due to the diffraction wave is significantly improved at the second angle? W 'of 80 degrees.

Further, when the radius of the first surface 151 is similar to the height of the quadrifilariler antenna 100, for example, the height of the main body 130, the axial ratio characteristic of the quadrifilariler antenna 100 may be good .

The reflector of the reflector 150 of FIG. 5 may further reduce the width, or radius R_U, as compared to the reflector 150 of FIG. 2, which may be better for miniaturization of the quadrifilariler antenna 100.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented within a computer system, such as, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA) , A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing unit may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (8)

In a quadrifilariler antenna,
A main body having a plurality of radiation elements formed therein; And
A reflector for at least one of reflection and diffraction of signals radiated from the plurality of radiating elements,
Lt; / RTI >
The reflector
A first side; And
And a second surface having a first angle with the first surface
/ RTI >
Wherein the second surface is a conical shape.
delete delete The method according to claim 1,
Wherein the first angle is 90 degrees or less.
The method according to claim 1,
The reflector
And a third surface having a second angle with the second surface
And a quadrupole antenna.
6. The method of claim 5,
Wherein the second surface is a cylindrical shape and the third surface is a conical shape.
6. The method of claim 5,
Wherein the first angle and the second angle are 90 degrees or less and the second angle is less than the first angle.
The method according to claim 1,
A feed circuit for feeding the plurality of radiating elements
Further comprising:
Wherein the power feeding circuit is implemented inside the reflector.

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