WO2018016705A1 - Quadrifilar antenna comprising reflector - Google Patents

Abstract

A quadrifilar antenna comprising a reflector is disclosed. The quadrifilar antenna according to one embodiment comprises: a main body having a plurality of radiation elements; and the reflector, located at the lower end of the main body, for reflecting and/or diffracting signals radiated from the plurality of radiation elements.

Description

Quadrefiller Antenna with Reflector

The embodiments below relate to a quad refiller antenna comprising a reflector.

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

The quad refiller antenna is an electrical microantenna for providing circular polarization in the angular region of the blog. Quad refiller antennas generally consist of four helices, each helix formed identically on the circumferential surface of a dielectric cylinder or dielectric disk support, each powered by a signal of the same amplitude with four phases applied do.

In order to improve the axis angle of the quad refiller antenna, the quad refiller antenna is changed into a conical cylinder shape and the pitch of the hellis is changed. However, there is a limit in increasing the height of the quad refiller antenna or manufacturing the antenna.

Embodiments provide a technique for improving the axial ratio angle of a quad refiller antenna by implementing a reflector for at least one of reflection and diffraction of signals emitted from the plurality of radiating elements at a bottom of a main body having a plurality of radiating elements formed thereon. can do.

According to an exemplary embodiment, a quad refiller antenna includes a main body having a plurality of radiating elements formed thereon, and a reflector for at least one of reflection and diffraction of signals radiated from the plurality of radiating elements located at a lower end of the main body. can do.

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

The second face may have a cylindrical shape, and the third face may have a conical shape.

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

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

1 is a schematic structural diagram of a quad refiller antenna according to an exemplary embodiment.

FIG. 2 is a schematic structural diagram of an example of the reflector shown in FIG. 1.

FIG. 3 is a diagram for describing reflection and diffraction of a signal by the reflector illustrated in FIG. 2.

FIG. 4A is an example of a graph for describing an axial ratio characteristic of a quad refiller antenna improved through the reflector of FIG. 2.

4B is another example of a graph for explaining the axial ratio characteristics of the quad refiller antenna improved through the reflector of FIG. 2. FIG. 5 is a schematic structural diagram of another example of the reflector shown in FIG.

FIG. 6 is a graph illustrating an axial ratio characteristic of a quad refiller antenna improved through the reflector of FIG. 5.

Specific structural or functional descriptions of the embodiments according to the inventive concept disclosed herein are merely illustrated for the purpose of describing the embodiments according to the inventive concept, and the embodiments according to the inventive concept. These may be embodied in various forms and are not limited to the embodiments described herein.

Embodiments according to the inventive concept may be variously modified and have various forms, so embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the embodiments in accordance with the concept of the present invention to specific embodiments, it includes all changes, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms such as first or second may be used to describe various components, but the components should not be limited by the terms. The terms are only for the purpose of distinguishing one component from another component, for example, without departing from the scope of the rights according to the inventive concept, the first component may be called a second component, Similarly, the second component may also be referred to as the first component.

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. 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. Expressions describing relationships between components, such as "between" and "immediately between" or "directly neighboring", 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. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof, that includes one or more other features or numbers. It should be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations 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 herein. Do not.

Hereinafter, exemplary 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 numerals in the drawings denote like elements.

1 is a schematic structural diagram of a quad refiller antenna according to an exemplary 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 quad refiller antenna 100 may further include a power supply circuit 170.

The quad refiller antenna 100 may be implemented in a radio frequency identification (RFID), a global positioning system (GPS), a satellite, or the like. In addition, the quad refiller antenna 100 may be implemented in a personal computer (PC), a data server, or a portable electronic device.

Portable electronic devices include laptop computers, mobile phones, smart phones, tablet PCs, mobile internet devices (MIDs), personal digital assistants (PDAs), enterprise digital assistants (EDAs). ), Digital still cameras, digital video cameras, portable multimedia players (PMPs), personal navigation devices or portable navigation devices (PNDs), handheld consoles, e-books ( It may be implemented as an e-book or a smart device. For example, the smart device may 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 power supply circuit 170. The plurality of radiating elements 110 may be electrically connected to the power supply circuit 170.

The 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 and an oblique line. In this case, the plurality of radiating elements 110 may be electrically connected, and a distance between the plurality of radiating elements may 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 negative position of the radiation pattern.

The main body 130 may be implemented in various forms such as cylindrical, square, polygonal, and the like. In addition, the main body 130 may be implemented through various media such as dielectric, PCB, air, ceramic, and the like.

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

The quad refiller antenna 100 may extend an axial ratio characteristic, for example, an axial ratio through the reflector 150. By improving the axial ratio characteristics of the quadrefill antenna 100, the radiation pattern and / or the gain of the quadrefill antenna 100 can be improved.

In addition, since the height of the main body 130 in which the plurality of radiating elements 110 is implemented may be low, the quadrefill antenna 100 may be miniaturized. As a result, the manufacturing cost of the quad refiller antenna 100 may also be reduced.

The feed circuit 170 may transmit feed signals to the plurality of radiating elements 110. That is, the power supply circuit 170 may power the plurality of radiating elements 110 through the power supply 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 or voltage) supplied from the outside. That is, the power supply circuit 170 may power the radiating elements 110 by receiving power, for example, feed signals from the outside.

The power supply circuit 170 may be implemented inside the reflector 150. Accordingly, the quad refiller antenna 100 may be miniaturized.

FIG. 2 is a schematic structural diagram 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, and FIG. 4A is improved through the reflector of FIG. 2. FIG. 4B is another example of a graph for describing the axial ratio characteristic of the quadrifilter antenna improved through the reflector of FIG. 2.

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

The first surface 151 may have a first angle θw with the second surface 153. That is, the reflector 150 may be implemented such that the first surface 151 forms the first angle θ w with the second surface 153.

The second surface 153 may be implemented in the form of a cone, and the first angle θw may be 90 degrees or less.

When the first angle θw formed by the first surface 151 and the second surface 153, that is, the wedge angle is 90 degrees or less, the axial ratio characteristic of the quadrefill antenna 100 may be good. The reflector 150 may be implemented in a cylindrical shape or a cone shape. That is, although the reflector 150 is illustrated in the form of a cone in FIG. 2, the present disclosure is not limited thereto, and the reflector 150 may be implemented in a cylindrical form.

In FIG. 3, the back radiation of the quad refiller antenna 100 is simplified and described for convenience of description of the radiation and diffraction of the source (eg, a signal) by the reflector 150. As shown in FIG. 3, the source of the half period 150 is at the height of the quad refiller antenna 100, for example, the height H_A of the main body 130 in which the plurality of radiating elements 110 are formed. It may be incident on the first surface 151. The source may mean a radiation signal radiated from the plurality of radiating elements 110. In this case, the reflection shadow area, the incident shadow area, and the observation point of the reflected field in the quad refiller antenna 100 may be determined according to the incident angle θ i of the source and the size of the radius R_U of the reflector 150. The radius R_U of the reflector 150 refers to the radius of the first surface 151. In addition, the magnitude and direction of the diffraction wave may be determined according to the incident angle θ i of the source and the first angle θ w, which is a wedge angle.

The first angle θw, which is a wedge angle, may be expressed by Equation 1.

The incident angle θi at which the rear field is incident on the reflector 150 may be expressed by Equation 2 below.

For example, when the radius R_U of the first surface 151 and the radius R_L of the second surface 153 are the same, the first angle θw is 90 degrees. In this case, the reflector 150 may be a cylindrical reflector.

As shown in FIG. 4A, the angle of incidence θ i of the rear radiation incident from the quad refiller antenna 100 decreases as the radius R_U of the first surface 151 increases, thereby increasing the reflection area. It can be seen that the axial ratio angle of the quad refiller antenna 100 increases. As another example, when the radius R_L of the second surface 153 decreases, the first angle θ1 may decrease to 90 degrees or less. Can be. In this case, the reflector 150 may be a conical reflector.

As shown in FIG. 4B, the axial ratio due to the diffraction wave may be improved as the first angle θ1 of the reflector 150 decreases. In particular, it can be seen that the axial ratio due to the diffraction wave is greatly improved at the first angle θw at 80 degrees. In order to improve the axial ratio, the radius R_U of the reflector 150 should be larger than the height H_A of the quadrefiller antenna 100. However, when the radius R_U is constrained, the first angle θw, which is the wedge angle, is made small. It can be seen that the axial ratio of the quad refiller antenna 100 can be improved.

The incidence angle θ i of the rear radiation incident from the quad refiller antenna 100 decreases as the radius R_U of the first surface 151 increases, and thus, the reflection area becomes wider, thereby increasing the width of the quad refill antenna 100. It can be seen that the axial angle increases.

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

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 may mean an upper surface of the reflector 150, and the second surface 153 and the third surface 155 may mean a side surface of the reflector 150. In this case, the second surface 153 may be positioned at the upper portion, and the third surface 155 may be positioned at the lower portion.

The first surface 151 may have a first angle θw with the second surface 153. The second surface 153 may form a second angle θw ′ with the third surface 155. That is, in the reflector 150, the first surface 151 forms the first angle θw with the second surface 153, and the second surface 153 has the third surface 155 with the second angle θw '. Can be implemented. The first angle θw and the second angle θw 'may be less than or equal to 90 degrees, and the second angle θw' may be smaller than the first angle θw.

For example, the second face 153 may have a cylindrical shape, and the third face 155 may have a conical shape. The first angle θw is vertical (eg, 90 degrees) and the second angle. (θw ') may be 90 degrees or less. That is, the reflector 150 may be implemented in the form of a combination of a cylinder and a cone.

When the second angle θw 'formed between the second surface 153 and the third surface 155, that is, the wedge angle is 90 degrees or less, the axial ratio characteristic of the quadrefill antenna 100 may be good.

The wedge angle of the second angle θw 'may be expressed as shown in 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 half-fiber 150 shown in FIG. 2, but the height of the second surface 153 is different. As H_M increases, the second angle θw 'may decrease.

In this case, 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 a field flowing along the second surface 153. Secondary diffraction may occur where a wedge, i.e., a second angle θw 'occurs. The source may mean a radiation signal radiated from the plurality of radiating elements 110.

As shown in FIG. 6, the axial ratio due to the diffraction wave may be improved as the height H_M of the second surface 153 increases and the second angle θw ', which is a wedge angle, decreases. In particular, it can be seen that the axial ratio due to the diffraction wave is greatly improved at the second angle θw 'at 80 degrees.

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

The reflector of the reflector 150 of FIG. 5 may further reduce the width, that is, the radius R_U, in comparison with the reflector 150 of FIG. 2, which may be better for miniaturization of the quad refiller 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 devices and components described in the embodiments are, for example, processors, controllers, arithmetic logic units (ALUs), digital signal processors, microcomputers, field programmable gate arrays (FPGAs). Can be implemented using one or more general purpose or special purpose computers, such as 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 the execution of the software. For convenience of explanation, one processing device may be described as being used, but one of ordinary skill in the art will appreciate that the processing device includes a plurality of processing elements and / or a plurality of types of processing elements. It can be seen that it may include. For example, the processing device may include a plurality of processors or one processor and one controller. In addition, other processing configurations are possible, such as parallel processors.

The software may include a computer program, code, instructions, or a combination of one or more of the above, and configure the processing device to operate as desired, or process it independently or collectively. You can command the device. Software and / or data may be any type of machine, component, physical device, virtual equipment, computer storage medium or device in order to be interpreted by or to provide instructions or data to the processing device. Or may be permanently or temporarily embodied in a signal wave to be transmitted. The software may be distributed over networked computer systems so that they may be stored or executed in a distributed manner. Software and data may be stored on one or more computer readable recording media.

The method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, 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 not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

Although the embodiments have been described by the limited embodiments and the drawings as described above, various modifications and variations are possible to those skilled in the art from the above description. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the claims that follow.

Claims (8)

1. In the quad refiller antenna,

   A main body in which a plurality of radiating elements are formed; And

   A reflector positioned at the bottom of the main body for at least one of reflection and diffraction of signals emitted from the plurality of radiating elements

   Quad refiller antenna comprising a.
2. The method of claim 1,

   The reflector,

   First side; And

   A second surface forming a first angle with the first surface

   Quad refiller antenna comprising a.
3. The method of claim 2,

   The second surface is a quadruple filler antenna having a conical shape.
4. The method of claim 2,

   And the first angle is equal to or less than 90 degrees.
5. The method of claim 2,

   The reflector,

   A third surface forming a second angle with the second surface

   Quad refiller antenna further comprising.
6. The method of claim 5,

   The second surface is a cylindrical shape, the third surface is a quadruple filler antenna.
7. The method of claim 5,

   The first angle and the second angle is less than 90 degrees, the second angle is smaller than the first refiller antenna.
8. The method of claim 1,

   Feed circuit for feeding the plurality of radiating elements

   More,

   The power supply circuit is a quad refiller antenna implemented in the reflector.

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