WO2021225235A1 - Antenna for wearable uhf rfid reader - Google Patents

Antenna for wearable uhf rfid reader Download PDF

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Publication number
WO2021225235A1
WO2021225235A1 PCT/KR2020/015104 KR2020015104W WO2021225235A1 WO 2021225235 A1 WO2021225235 A1 WO 2021225235A1 KR 2020015104 W KR2020015104 W KR 2020015104W WO 2021225235 A1 WO2021225235 A1 WO 2021225235A1
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Prior art keywords
wearable
rfid reader
patch
uhf rfid
main patch
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PCT/KR2020/015104
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French (fr)
Korean (ko)
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이진성
윤대영
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(주)에스피에스
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Publication of WO2021225235A1 publication Critical patent/WO2021225235A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
    • H01Q5/25—Ultra-wideband [UWB] systems, e.g. multiple resonance systems; Pulse systems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10297—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna

Definitions

  • the proposed technology relates to an antenna for a wearable UHF RFID reader, and more particularly, to an antenna for a wearable UHF RFID reader that maintains a constant recognition distance with an RFID tag regardless of the properties of an adjacent material.
  • a radio frequency indentification (RFID) technology enables automatic identification of a unique item by using a radio frequency (RF) signal.
  • RFID radio frequency
  • a typical RFID system includes a tag, a reader, an antenna, and a host system.
  • the reader collects information about the object by communicating with a tag attached to the object through an antenna.
  • the mobile RFID reader provides the user with the convenience of moving, so the method of storing and transmitting data is important.
  • the characteristics of the antenna change according to the adjacent material.
  • the characteristics are changed under the influence of the human body.
  • the wearer of the wearable UHF RFID reader cannot be specified, the distance between the human body and the antenna varies depending on the wearing type and location, and the change in the distance between the human body and the antenna affects the change in the recognition distance of the UHF RFID tag There is this.
  • the present invention was invented to solve the above problems, and an object of the present invention is to provide an antenna for an RFID reader that operates omnidirectionally in a short distance by intentionally lowering a gain characteristic.
  • Another object of the present invention is to provide an antenna for an RFID reader that maintains a constant recognition distance with an RFID tag regardless of the influence of the wearer's body located on the rear side of the antenna for the RFID reader in the radiation direction.
  • a main patch including a first resistor and a first inductor
  • a parasitic patch positioned on the same plane as the main patch and including a second resistor and a second inductor;
  • the main patch and the parasitic patch are placed diagonally to each other,
  • an antenna for an RFID reader in which a recognition distance to an RFID tag is kept constant regardless of characteristics of a material adjacent to the antenna for an RFID reader.
  • FIG. 1 is an exemplary view of wearing a wearable RFID reader to which the antenna of the present invention is applied.
  • FIG. 2 is a structural diagram of the antenna of the present invention.
  • FIG. 3 is a vertical cross-sectional view of the antenna of the present invention.
  • FIG. 4 is a circuit diagram of the antenna of the present invention.
  • 5 is a coordinate system and radiation pattern of the antenna of the present invention.
  • the present invention relates to an antenna for a wearable UHF RFID reader, and more particularly, to an antenna for a wearable UHF RFID reader that maintains a constant recognition distance from an RFID tag regardless of properties of an adjacent material.
  • FIG. 1 shows an example of wearing a wearable RFID reader to which the antenna of the present invention is applied
  • FIG. 2 shows a structural diagram of the antenna of the present invention
  • FIG. 4 shows a vertical cross-sectional view of the antenna of the present invention .
  • the antenna of the present invention applied to a wearable UHF RFID reader includes a main patch 2 including a first resistor (R1) and a first inductor (L1), and the same as the main patch (2).
  • a parasitic patch 6 positioned on a plane and including a second resistor R2 and a second inductor L2, a ground plane 10 disposed parallel to the main patch 2, and the main patch and a dielectric substrate (8) formed between (2) and the ground plane.
  • the dielectric substrate 8 is positioned in a horizontal or vertical direction with respect to the reader body.
  • the main patch 2 and the parasitic patch 6 are formed to have the same shape and area.
  • the main patch 2 and the parasitic patch 6 are disposed to be spaced apart from each other by a predetermined interval (s) in the width direction of the dielectric substrate 8, and the other side of the main patch 2 and the parasitic patch 6 are disposed. One side of the is spaced apart from each other by a predetermined interval.
  • the main patch 2 and the parasitic patch 6 are arranged to be positioned diagonally to each other, and the other end of the main patch 2 and the parasitic patch 6 are disposed in the longitudinal direction of the dielectric substrate 8 .
  • One end of the is arranged to overlap each other by a predetermined length.
  • a first short pin 12 for shorting the upper and lower surfaces of the dielectric substrate 8 is formed at one edge at one end of the main patch 2 , and the main patch is formed on the dielectric substrate 8 .
  • a feed probe 20 for feeding power is formed at the rear end in the longitudinal direction of (2).
  • a U.FL cable is connected to the lower end of the first short pin 12 .
  • An upper end of the feed probe 20 is connected to a first pad 22 disposed on the same plane as the main patch 2 .
  • the first pad 22 and the main patch 2 are connected by a series capacitor Ca for matching between the feed probe 20 and the main patch 2 .
  • a third short pin 16 and a fourth short pin 18 for shorting the upper and lower surfaces of the dielectric substrate 8 are formed on one side of the feed probe 20 .
  • the second pad 24 and the main patch 2 are connected by a parallel capacitor Cb for matching between the ground plane 10 and the main patch 2 .
  • a second short pin 14 for shorting the upper and lower surfaces of the dielectric substrate 8 is formed at the other edge at the other end of the parasitic patch 6 .
  • the current coupled in the main patch 2 flows to the second short pin 14 located in the diagonal direction.
  • FIG. 4 is a circuit diagram of the antenna of the present invention.
  • the main patch 2 includes a first resistor R1 and a first inductor L1.
  • the value of the first register R1 is the sum of radiation resistance and loss resistance of the main patch 2 , and is determined by the size of the area of the main patch 2 .
  • the value of the first inductor L1 is adjusted by the size of the area of the main patch 2 and the separation distance d between one side of the main patch 2 and the first short pin 12 .
  • a slot 4 of a predetermined length is formed in the central portion of the main patch 2 in the width direction of the dielectric substrate 8.
  • the length of the slot 4 is adjusted to fine-tune the value of the first inductor L1. will be regulated
  • the parasitic patch 6 includes a second resistor R2 and a second inductor L2.
  • the value of the second resistor R2 and the value of the second inductor L2 are the area size of the parasitic patch 6 and the distance between the other side of the parasitic patch 6 and the second short pin 14 . controlled by distance.
  • the polarization by the main patch 2 and the polarization by the parasitic patch 6 are formed in a diagonal direction to each other.
  • the antenna is placed in a straight line on the vertical or horizontal line of the tag, so the polarized wave is radiated diagonally to the vertical and horizontal lines based on the antenna applied to the wearable UHF RFID reader. All tags located in .
  • FIG 5 shows the coordinate system and radiation pattern of the antenna of the present invention.
  • x, y, and z are coordinate systems for indicating the radiation direction of the polarization diversity antenna of the present invention, and radio waves are radiated in the +z direction.
  • the shape of overlapping two red balls becomes a radiation pattern.
  • FIG. 6 is a Smith chart of the antenna of the present invention, which shows the impedance matching state of the antenna of the present invention, and it can be seen that 50 ohm impedance matching is achieved near 920 MHz.
  • FIG. 7 is a frequency graph of the antenna of the present invention
  • FIG. 8 is a performance-gain graph of the antenna of the present invention. It can be seen that the center frequency of the antenna of the present invention is near 920 MHz.

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  • Engineering & Computer Science (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
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  • Details Of Aerials (AREA)

Abstract

The present invention relates to an antenna for a wearable UHF RFID reader, and more specifically, to an antenna for a wearable UHF RFID reader, which maintains a uniform recognition distance for RFID tags regardless of the properties of materials nearby.

Description

착용 가능한 UHF RFID 리더기용 안테나Antenna for wearable UHF RFID reader
제안기술은 착용 가능한 UHF RFID 리더기용 안테나에 관한 것으로, 더욱 상세하게는 인접하는 물질의 특성과 상관없이 RFID 태그와의 인식 거리가 일정하게 유지되는 착용 가능한 UHF RFID 리더기용 안테나에 관한 발명이다.The proposed technology relates to an antenna for a wearable UHF RFID reader, and more particularly, to an antenna for a wearable UHF RFID reader that maintains a constant recognition distance with an RFID tag regardless of the properties of an adjacent material.
일반적으로 RFID(Radio Frequency indentification) 기술은 무선 주파수(RF) 신호를 사용함으로써 고유의 아이템의 자동적인 식별을 가능하게 한다. 일반적인 RFID 시스템은 태그, 리더기, 안테나 및 호스트 시스템을 포함한다. 리더기는 안테나를 통해 물체에 부착되는 태그와 통신함으로써 물체에 대한 정보를 수집한다.In general, a radio frequency indentification (RFID) technology enables automatic identification of a unique item by using a radio frequency (RF) signal. A typical RFID system includes a tag, a reader, an antenna, and a host system. The reader collects information about the object by communicating with a tag attached to the object through an antenna.
특히 이동형 RFID 리더기는 사용자에게 이동 가능한 편리성을 제공하게 되어 데이터의 저장 및 전송 방법이 중요하다.In particular, the mobile RFID reader provides the user with the convenience of moving, so the method of storing and transmitting data is important.
한편, 안테나는 인접하는 물질에 따라서 특성이 변화되는데, 인체에 착용 가능한 UHF RFID 리더기에 적용되는 안테나의 경우 인체의 영향을 받아 특성이 변화된다.On the other hand, the characteristics of the antenna change according to the adjacent material. In the case of an antenna applied to a UHF RFID reader that can be worn on the human body, the characteristics are changed under the influence of the human body.
그러나 착용 가능한 UHF RFID 리더기의 착용자를 특정할 수 없기 때문에 착용 형태 및 위치에 따라 인체와 안테나 사이의 거리가 달라지게 되며, 인체와 안테나 사이의 거리 변화는 UHF RFID 태그 인식 거리 변화에 영향을 미치는 문제점이 있다.However, since the wearer of the wearable UHF RFID reader cannot be specified, the distance between the human body and the antenna varies depending on the wearing type and location, and the change in the distance between the human body and the antenna affects the change in the recognition distance of the UHF RFID tag There is this.
본 발명은 상기와 같은 문제를 해결하기 위해 발명된 것으로서, 이득 특성을 의도적으로 낮춰 근거리에서 무지향성으로 동작하는 RFID 리더기용 안테나를 제공하는데 목적이 있다.The present invention was invented to solve the above problems, and an object of the present invention is to provide an antenna for an RFID reader that operates omnidirectionally in a short distance by intentionally lowering a gain characteristic.
또한, RFID 리더기용 안테나의 방사 방향 뒷면에 위치한 착용자의 인체에 따른 영향과 상관없이 RFID 태그와의 인식 거리가 일정하게 유지되는 RFID 리더기용 안테나를 제공하는데 목적이 있다.Another object of the present invention is to provide an antenna for an RFID reader that maintains a constant recognition distance with an RFID tag regardless of the influence of the wearer's body located on the rear side of the antenna for the RFID reader in the radiation direction.
상기와 같은 목적을 달성하기 위한 본 발명의 착용 가능한 UHF RFID 리더기용 안테나에 있어서,In the antenna for wearable UHF RFID reader of the present invention for achieving the above object,
제1레지스터(resistor)와 제1인덕터(inductor)를 포함하는 메인 패치;a main patch including a first resistor and a first inductor;
메인 패치와 동일한 평면상에 위치하며, 제2레지스터와 제2인덕터를 포함하는 기생 패치;a parasitic patch positioned on the same plane as the main patch and including a second resistor and a second inductor;
메인 패치와 평행하게 배치된 접지면; 및a ground plane placed parallel to the main patch; and
메인 패치와 접지면 사이에 형성된 유전체 기판;을 포함하며,a dielectric substrate formed between the main patch and the ground plane; and
메인 패치와 기생 패치는 서로 대각선 방향으로 배치되어,The main patch and the parasitic patch are placed diagonally to each other,
메인 패치에 의한 편파 및 기생 패치에 의한 편파가 서로 대각선 방향으로 형성되는 것을 특징으로 한다.It is characterized in that the polarization by the main patch and the polarization by the parasitic patch are formed in a diagonal direction to each other.
본 발명에 따르면, RFID 리더기용 안테나와 인접하는 물질의 특성과 상관없이 RFID 태그와의 인식 거리가 일정하게 유지되는 RFID 리더기용 안테나를 제공할 수 있는 효과가 있다.Advantageous Effects of Invention According to the present invention, it is possible to provide an antenna for an RFID reader in which a recognition distance to an RFID tag is kept constant regardless of characteristics of a material adjacent to the antenna for an RFID reader.
도 1은 본 발명의 안테나가 적용되는 웨어러블 RFID 리더기의 착용 예시도.1 is an exemplary view of wearing a wearable RFID reader to which the antenna of the present invention is applied.
도 2는 본 발명의 안테나의 구조도.2 is a structural diagram of the antenna of the present invention.
도 3은 본 발명의 안테나의 상하 단면도.3 is a vertical cross-sectional view of the antenna of the present invention.
도 4는 본 발명의 안테나의 회로도.4 is a circuit diagram of the antenna of the present invention.
도 5는 본 발명의 안테나의 좌표계 및 방사 패턴.5 is a coordinate system and radiation pattern of the antenna of the present invention.
도 6은 본 발명의 안테나의 Smith Chart.6 is a Smith Chart of the antenna of the present invention.
도 7은 본 발명의 안테나의 주파수 그래프.7 is a frequency graph of the antenna of the present invention.
도 8은 본 발명의 안테나의 성능-이득 그래프.8 is a performance-gain graph of the antenna of the present invention.
상술한 본 발명의 특징 및 효과는 첨부된 도면과 관련한 다음의 상세한 설명을 통하여 보다 분명해 질 것이며, 그에 따라 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 본 발명의 기술적 사상을 용이하게 실시할 수 있을 것이다. 본 발명은 다양한 변경을 가할 수 있고 여러 가지 형태를 가질 수 있는바, 특정 실시 예들을 도면에 예시하고 본문에 상세하게 설명하고자 한다. 그러나 이는 본 발명을 특정한 개시형태에 대해 한정하려는 것이 아니며, 본 발명의 사상 및 기술범위에 포함되는 모든 변경, 균등물 내지 대체물을 포함하는 것으로 이해되어야 한다. 본 출원에서 사용되는 용어는 단지 특정한 실시 예들을 설명하기 위한 것으로, 본 발명을 한정하려는 의도가 아니다.The features and effects of the present invention described above will become more apparent through the following detailed description in relation to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains can easily implement the technical idea of the present invention. will be able Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. The terms used in the present application are only for describing specific embodiments, and are not intended to limit the present invention.
이하, 본 발명의 바람직한 실시 예를 첨부도면을 참조하여 상세히 설명한다. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
본 발명은 착용 가능한 UHF RFID 리더기용 안테나에 관한 것으로, 더욱 상세하게는 인접하는 물질의 특성과 상관없이 RFID 태그와의 인식 거리가 일정하게 유지되는 착용 가능한 UHF RFID 리더기용 안테나에 관한 발명이다.The present invention relates to an antenna for a wearable UHF RFID reader, and more particularly, to an antenna for a wearable UHF RFID reader that maintains a constant recognition distance from an RFID tag regardless of properties of an adjacent material.
도 1에는 본 발명의 안테나가 적용되는 웨어러블 RFID 리더기의 착용 예시도가 도시되어 있고, 도 2에는 본 발명의 안테나의 구조도가 도시되어 있으며, 도 4에는 본 발명의 안테나의 상하 단면도가 도시되어 있다.1 shows an example of wearing a wearable RFID reader to which the antenna of the present invention is applied, FIG. 2 shows a structural diagram of the antenna of the present invention, and FIG. 4 shows a vertical cross-sectional view of the antenna of the present invention .
착용 가능한 UHF RFID 리더기에 적용되는 본 발명의 안테나는 제1레지스터(resistor)(R1)와 제1인덕터(inductor)(L1)를 포함하는 메인 패치(2)와, 상기 메인 패치(2)와 동일한 평면상에 위치하며, 제2레지스터(R2)와 제2인덕터(L2)를 포함하는 기생 패치(6)와, 상기 메인 패치(2)와 평행하게 배치된 접지면(10)과, 상기 메인 패치(2)와 상기 접지면 사이에 형성된 유전체 기판(dielectric substrate)(8)을 포함하여 구성된다.The antenna of the present invention applied to a wearable UHF RFID reader includes a main patch 2 including a first resistor (R1) and a first inductor (L1), and the same as the main patch (2). A parasitic patch 6 positioned on a plane and including a second resistor R2 and a second inductor L2, a ground plane 10 disposed parallel to the main patch 2, and the main patch and a dielectric substrate (8) formed between (2) and the ground plane.
상기 유전체 기판(8)은 리더기 본체에 대해 수평 또는 수직 방향에 위치한다.The dielectric substrate 8 is positioned in a horizontal or vertical direction with respect to the reader body.
상기 메인 패치(2)와 상기 기생 패치(6)는 서로 동일한 형상 및 면적으로 형성된다.The main patch 2 and the parasitic patch 6 are formed to have the same shape and area.
상기 메인 패치(2)와 상기 기생 패치(6)는 상기 유전체 기판(8)의 폭방향으로 일정 간격(s) 이격되어 배치되는 것으로, 상기 메인 패치(2)의 타측과 상기 기생 패치(6)의 일측은 서로 일정 간격 이격된다. 상기 메인 패치(2)와 상기 기생 패치(6) 사이의 폭방향 간격을 조절하여 상기 메인 패치(2)와 상기 기생 패치(6) 사이의 결합 커패시턴스(couple capacitance) 정도를 조정하게 된다.The main patch 2 and the parasitic patch 6 are disposed to be spaced apart from each other by a predetermined interval (s) in the width direction of the dielectric substrate 8, and the other side of the main patch 2 and the parasitic patch 6 are disposed. One side of the is spaced apart from each other by a predetermined interval. By adjusting the width direction gap between the main patch 2 and the parasitic patch 6 , the degree of coupling capacitance between the main patch 2 and the parasitic patch 6 is adjusted.
이때, 상기 메인 패치(2)와 상기 기생 패치(6)는 서로 대각선 방향에 위치하도록 배치되며, 상기 유전체 기판(8)의 길이 방향으로 상기 메인 패치(2)의 타단과 상기 기생 패치(6)의 일단이 서로 일정 길이 겹쳐지도록 배치된다.At this time, the main patch 2 and the parasitic patch 6 are arranged to be positioned diagonally to each other, and the other end of the main patch 2 and the parasitic patch 6 are disposed in the longitudinal direction of the dielectric substrate 8 . One end of the is arranged to overlap each other by a predetermined length.
상기 메인 패치(2)의 일단에서 일측 모서리에는 상기 유전체 기판(8)의 상면과 하면을 단락시키는 제1쇼트핀(Short Pin)(12)이 형성되고, 상기 유전체 기판(8)에서 상기 메인 패치(2)의 길이 방향 후단에는 급전을 위한 피드 프로브(feed probe)(20)가 형성된다.A first short pin 12 for shorting the upper and lower surfaces of the dielectric substrate 8 is formed at one edge at one end of the main patch 2 , and the main patch is formed on the dielectric substrate 8 . A feed probe 20 for feeding power is formed at the rear end in the longitudinal direction of (2).
상기 제1쇼트핀(12)의 하단에는 U.FL 케이블이 연결된다.A U.FL cable is connected to the lower end of the first short pin 12 .
상기 피드 프로브(20)의 상단은 상기 메인 패치(2)와 동일한 평면상에 배치되는 제1패드(22)와 연결된다.An upper end of the feed probe 20 is connected to a first pad 22 disposed on the same plane as the main patch 2 .
상기 제1패드(22)와 상기 메인 패치(2)는 상기 피드 프로브(20)와 상기 메인 패치(2) 간의 정합을 위한 직렬 커패시터(Capacitor)(Ca)에 의해 연결된다.The first pad 22 and the main patch 2 are connected by a series capacitor Ca for matching between the feed probe 20 and the main patch 2 .
상기 피드 프로브(20)의 일측에는 상기 유전체 기판(8)의 상면과 하면을 단락시키는 제3쇼트핀(16) 및 제4쇼트핀(18)이 형성된다.A third short pin 16 and a fourth short pin 18 for shorting the upper and lower surfaces of the dielectric substrate 8 are formed on one side of the feed probe 20 .
상기 제3쇼트핀(16) 및 제4쇼트핀(18)의 상단은 상기 메인 패치(2)와 동일한 평면상에 배치되는 제2패드(24)와 연결된다.Upper ends of the third short pin 16 and the fourth short pin 18 are connected to a second pad 24 disposed on the same plane as the main patch 2 .
상기 제2패드(24)와 상기 메인 패치(2)는 상기 접지면(10)과 상기 메인 패치(2) 간의 정합을 위한 병렬 커패시터(Capacitor)(Cb)에 의해 연결된다.The second pad 24 and the main patch 2 are connected by a parallel capacitor Cb for matching between the ground plane 10 and the main patch 2 .
상기 기생 패치(6)의 타단에서 타측 모서리에는 상기 유전체 기판(8)의 상면과 하면을 단락시키는 제2쇼트핀(Short Pin)(14)이 형성된다.A second short pin 14 for shorting the upper and lower surfaces of the dielectric substrate 8 is formed at the other edge at the other end of the parasitic patch 6 .
상기 메인 패치(2)에서 결합(couple)된 전류는 대각선 방향에 위치한 상기 제2쇼트핀(14)으로 흐르게 된다.The current coupled in the main patch 2 flows to the second short pin 14 located in the diagonal direction.
도 4에는 본 발명의 안테나의 회로도가 도시되어 있다.4 is a circuit diagram of the antenna of the present invention.
상기 메인 패치(2)는 제1레지스터(R1)와 제1인덕터(L1)를 포함하여 구성된다. The main patch 2 includes a first resistor R1 and a first inductor L1.
상기 제1레지스터(R1)의 값은 상기 메인 패치(2)의 radiation resistance와 loss resistance의 합이며, 상기 메인 패치(2)의 면적 크기에 의해 결정된다.The value of the first register R1 is the sum of radiation resistance and loss resistance of the main patch 2 , and is determined by the size of the area of the main patch 2 .
상기 제1인덕터(L1)의 값은 상기 메인 패치(2)의 면적 크기 및 상기 메인 패치(2)의 일측과 상기 제1쇼트핀(12) 사이의 이격거리(d)로 조절된다.The value of the first inductor L1 is adjusted by the size of the area of the main patch 2 and the separation distance d between one side of the main patch 2 and the first short pin 12 .
상기 메인 패치(2)의 중앙부에는 상기 유전체 기판(8)의 폭방향으로 일정 길이의 슬롯(4)이 형성되는데, 상기 슬롯(4)의 길이를 조절하여 상기 제1인덕터(L1) 값을 미세 조절하게 된다.A slot 4 of a predetermined length is formed in the central portion of the main patch 2 in the width direction of the dielectric substrate 8. The length of the slot 4 is adjusted to fine-tune the value of the first inductor L1. will be regulated
상기 기생 패치(6)는 제2레지스터(R2)와 제2인덕터(L2)를 포함하여 구성된다. The parasitic patch 6 includes a second resistor R2 and a second inductor L2.
상기 제2레지스터(R2)의 값과 상기 제2인덕터(L2)의 값은 상기 기생 패치(6)의 면적 크기 및 상기 기생 패치(6)의 타측과 상기 제2쇼트핀(14) 사이의 이격거리로 조절된다.The value of the second resistor R2 and the value of the second inductor L2 are the area size of the parasitic patch 6 and the distance between the other side of the parasitic patch 6 and the second short pin 14 . controlled by distance.
상기와 같은 배치 구조에 의해 상기 메인 패치(2)에 의한 편파 및 상기 기생 패치(6)에 의한 편파가 서로 대각선 방향으로 형성된다. By the arrangement structure as described above, the polarization by the main patch 2 and the polarization by the parasitic patch 6 are formed in a diagonal direction to each other.
착용 가능한 UHF RFID 리더기를 착용한 사용자의 특성상 안테나를 태그(Tag)의 수직 또는 수평선상에 일직선으로 위치시키게 되므로 편파를 대각선으로 방사하도록 하여 착용 가능한 UHF RFID 리더기에 적용된 안테나를 기준으로 수직 및 수평선상에 위치한 태그를 모두 읽을 수 있도록 하였다.Due to the characteristics of the user wearing the wearable UHF RFID reader, the antenna is placed in a straight line on the vertical or horizontal line of the tag, so the polarized wave is radiated diagonally to the vertical and horizontal lines based on the antenna applied to the wearable UHF RFID reader. All tags located in .
도 5에는 본 발명의 안테나의 좌표계 및 방사 패턴이 도시되어 있다.5 shows the coordinate system and radiation pattern of the antenna of the present invention.
x, y, z는 본 발명의 편파 다이버시티 안테나의 방사 방향을 표시하기 위한 좌표계이며, 전파는 +z 방향으로 방사된다. 붉은 공이 2개 겹쳐진 모양이 방사 패턴이 된다.x, y, and z are coordinate systems for indicating the radiation direction of the polarization diversity antenna of the present invention, and radio waves are radiated in the +z direction. The shape of overlapping two red balls becomes a radiation pattern.
도 6은 본 발명의 안테나의 Smith Chart로, 본 발명의 안테나의 임피던스 정합 상태를 표시하며, 920MHz 근처에서 50 ohm 임피던스 정합이 되었다는 것을 알 수 있다.6 is a Smith chart of the antenna of the present invention, which shows the impedance matching state of the antenna of the present invention, and it can be seen that 50 ohm impedance matching is achieved near 920 MHz.
도 7은 본 발명의 안테나의 주파수 그래프이고, 도 8은 본 발명의 안테나의 성능-이득 그래프로, 본 발명의 안테나의 중심 주파수가 920MHz 근처에 있다는 것을 알 수 있다.7 is a frequency graph of the antenna of the present invention, and FIG. 8 is a performance-gain graph of the antenna of the present invention. It can be seen that the center frequency of the antenna of the present invention is near 920 MHz.
앞서 설명한 본 발명의 상세한 설명에서는 본 발명의 바람직한 실시 예들을 참조하여 설명하였지만, 해당 기술 분야의 숙련된 당업자 또는 해당 기술 분야에 통상의 지식을 갖는 자라면 후술 될 특허청구범위에 기재된 본 발명의 사상 및 기술영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경시킬 수 있음을 이해할 수 있을 것이다.In the detailed description of the present invention described above, although it has been described with reference to preferred embodiments of the present invention, those skilled in the art or those having ordinary knowledge in the technical field will be described later in the claims of the present invention And it will be understood that the present invention can be variously modified and changed without departing from the technical scope.

Claims (17)

  1. 제1레지스터(resistor)와 제1인덕터(inductor)를 포함하는 메인 패치;a main patch including a first resistor and a first inductor;
    상기 메인 패치와 동일한 평면상에 위치하며, 제2레지스터와 제2인덕터를 포함하는 기생 패치;a parasitic patch disposed on the same plane as the main patch and including a second resistor and a second inductor;
    상기 메인 패치와 평행하게 배치된 접지면; 및a ground plane disposed parallel to the main patch; and
    상기 메인 패치와 상기 접지면 사이에 형성된 유전체 기판;을 포함하며,a dielectric substrate formed between the main patch and the ground plane;
    상기 메인 패치와 상기 기생 패치는 서로 대각선 방향으로 배치되어,The main patch and the parasitic patch are disposed in a diagonal direction to each other,
    상기 메인 패치에 의한 편파 및 상기 기생 패치에 의한 편파가 서로 대각선 방향으로 형성되는 것that the polarization by the main patch and the polarization by the parasitic patch are formed in a diagonal direction to each other
    을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.Antenna for wearable UHF RFID reader characterized by.
  2. 제1항에 있어서,According to claim 1,
    상기 유전체 기판의 폭방향으로 상기 메인 패치의 타측과 상기 기생 패치의 일측은 서로 일정 간격 이격되며,The other side of the main patch and one side of the parasitic patch are spaced apart from each other by a predetermined distance in the width direction of the dielectric substrate,
    상기 유전체 기판의 길이 방향으로 상기 메인 패치의 타단과 상기 기생 패치의 일단은 서로 일정 길이 겹쳐지는 것The other end of the main patch and one end of the parasitic patch overlap each other by a predetermined length in the longitudinal direction of the dielectric substrate
    을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.Antenna for wearable UHF RFID reader characterized by.
  3. 제2항에 있어서,3. The method of claim 2,
    상기 메인 패치와 상기 기생 패치 사이의 폭방향 간격을 조절하여 상기 메인 패치와 상기 기생 패치 사이의 결합(couple) 정도를 조정하는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.The wearable UHF RFID reader antenna according to claim 1, wherein the degree of coupling between the main patch and the parasitic patch is adjusted by adjusting the width direction gap between the main patch and the parasitic patch.
  4. 제2항에 있어서,3. The method of claim 2,
    상기 메인 패치의 일단에서 일측 모서리에는 상기 유전체 기판의 상면과 하면을 단락시키는 제1쇼트핀(Short Pin)이 형성되는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.A wearable UHF RFID reader antenna, characterized in that at one edge of one end of the main patch, a first short pin for shorting the upper and lower surfaces of the dielectric substrate is formed.
  5. 제4항에 있어서,5. The method of claim 4,
    상기 유전체 기판에서 상기 메인 패치의 길이 방향 후단에는 급전을 위한 피드 프로브(feed probe)가 형성되는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.A wearable UHF RFID reader antenna, characterized in that a feed probe for feeding power is formed at the rear end of the main patch in the longitudinal direction of the dielectric substrate.
  6. 제5항에 있어서,6. The method of claim 5,
    상기 피드 프로브의 상단은 상기 메인 패치와 동일한 평면상에 배치되는 제1패드와 연결되는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.A wearable UHF RFID reader antenna, characterized in that the upper end of the feed probe is connected to a first pad disposed on the same plane as the main patch.
  7. 제6항에 있어서,7. The method of claim 6,
    상기 제1패드와 상기 메인 패치는 상기 피드 프로브와 상기 메인 패치 간의 정합을 위한 직렬 커패시터(Capacitor)에 의해 연결되는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.The wearable UHF RFID reader antenna, characterized in that the first pad and the main patch are connected by a series capacitor (Capacitor) for matching between the feed probe and the main patch.
  8. 제5항에 있어서,6. The method of claim 5,
    상기 피드 프로브의 일측에는 상기 유전체 기판의 상면과 하면을 단락시키는 제3쇼트핀 및 제4쇼트핀이 형성되는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.A wearable UHF RFID reader antenna, characterized in that a third short pin and a fourth short pin for shorting the upper and lower surfaces of the dielectric substrate are formed on one side of the feed probe.
  9. 제8항에 있어서,9. The method of claim 8,
    상기 제3쇼트핀 및 제4쇼트핀의 상단은 상기 메인 패치와 동일한 평면상에 배치되는 제2패드와 연결되는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.The wearable UHF RFID reader antenna, characterized in that upper ends of the third and fourth short pins are connected to a second pad disposed on the same plane as the main patch.
  10. 제9항에 있어서,10. The method of claim 9,
    상기 제2패드 정합을 위한 병렬 커패시터(Capacitor)에 의해 연결되는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.Wearable UHF RFID reader antenna, characterized in that connected by a parallel capacitor (Capacitor) for matching the second pad.
  11. 제2항에 있어서,3. The method of claim 2,
    상기 기생 패치의 타단에서 타측 모서리에는 상기 유전체 기판의 상면과 하면을 단락시키는 제2쇼트핀(Short Pin)이 형성되는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.A wearable UHF RFID reader antenna, characterized in that at the other edge of the other end of the parasitic patch, a second short pin for shorting the upper and lower surfaces of the dielectric substrate is formed.
  12. 제11항에 있어서,12. The method of claim 11,
    상기 메인 패치에서 결합(couple)된 전류는 상기 제2쇼트핀으로 흐르는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.A wearable UHF RFID reader antenna, characterized in that the current coupled in the main patch flows to the second short pin.
  13. 제4항에 있어서,5. The method of claim 4,
    상기 제1인덕터는 상기 메인 패치의 면적 크기 및 상기 메인 패치의 일측과 상기 제1쇼트핀 사이의 이격거리로 조절되는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.The wearable UHF RFID reader antenna, characterized in that the first inductor is adjusted by the size of the area of the main patch and the separation distance between one side of the main patch and the first short pin.
  14. 제2항에 있어서,3. The method of claim 2,
    상기 메인 패치에는 일정 길이의 슬롯이 형성되며,A slot of a certain length is formed in the main patch,
    상기 슬롯의 길이를 조절하여 상기 제1인덕터를 미세 조절하는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.A wearable UHF RFID reader antenna, characterized in that the first inductor is finely adjusted by adjusting the length of the slot.
  15. 제12항에 있어서,13. The method of claim 12,
    상기 제2인덕터는 상기 기생 패치의 면적 크기 및 상기 기생 패치의 타측과 상기 제2쇼트핀 사이의 이격거리로 조절되는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.The second inductor is a wearable UHF RFID reader antenna, characterized in that adjusted by the size of the area of the parasitic patch and the separation distance between the second short pin and the other side of the parasitic patch.
  16. 제4항에 있어서,5. The method of claim 4,
    상기 제1쇼트핀의 하단에는 U.FL 케이블이 연결되는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.A wearable UHF RFID reader antenna, characterized in that a U.FL cable is connected to the lower end of the first short pin.
  17. 제1항에 있어서,According to claim 1,
    상기 유전체 기판은 리더기 본체에 대해 수평 또는 수직 방향에 위치하는 것을 특징으로 하는 착용 가능한 UHF RFID 리더기용 안테나.The wearable UHF RFID reader antenna, characterized in that the dielectric substrate is positioned in a horizontal or vertical direction with respect to the reader body.
PCT/KR2020/015104 2020-05-06 2020-11-02 Antenna for wearable uhf rfid reader WO2021225235A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080071890A (en) * 2007-01-31 2008-08-05 후지쯔 가부시끼가이샤 Rfid tag
KR20100074541A (en) * 2008-12-24 2010-07-02 전북대학교산학협력단 Rfid tag antenna
KR20110031614A (en) * 2009-09-21 2011-03-29 중앙대학교 산학협력단 Small zeroth-order resonant antenna with spiral slot on the ground plane
KR20120046805A (en) * 2010-10-27 2012-05-11 삼성전자주식회사 Mimo antenna apparatus
KR20160046314A (en) * 2014-10-20 2016-04-28 한국전자통신연구원 RFID reader antenna

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* Cited by examiner, † Cited by third party
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KR101720688B1 (en) 2014-01-08 2017-03-28 한국전자통신연구원 Microstrip antenna

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080071890A (en) * 2007-01-31 2008-08-05 후지쯔 가부시끼가이샤 Rfid tag
KR20100074541A (en) * 2008-12-24 2010-07-02 전북대학교산학협력단 Rfid tag antenna
KR20110031614A (en) * 2009-09-21 2011-03-29 중앙대학교 산학협력단 Small zeroth-order resonant antenna with spiral slot on the ground plane
KR20120046805A (en) * 2010-10-27 2012-05-11 삼성전자주식회사 Mimo antenna apparatus
KR20160046314A (en) * 2014-10-20 2016-04-28 한국전자통신연구원 RFID reader antenna

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