KR100374064B1 - Printed Slot Antenna for IC-card - Google Patents
Printed Slot Antenna for IC-card Download PDFInfo
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- KR100374064B1 KR100374064B1 KR10-2000-0005269A KR20000005269A KR100374064B1 KR 100374064 B1 KR100374064 B1 KR 100374064B1 KR 20000005269 A KR20000005269 A KR 20000005269A KR 100374064 B1 KR100374064 B1 KR 100374064B1
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- 238000000034 method Methods 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 10
- 230000006870 function Effects 0.000 claims description 13
- 239000004020 conductor Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 230000010287 polarization Effects 0.000 abstract description 10
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 230000009977 dual effect Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000015654 memory Effects 0.000 abstract description 4
- 238000007639 printing Methods 0.000 abstract description 4
- 230000005855 radiation Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
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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
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
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- 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
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
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- Waveguide Aerials (AREA)
- Details Of Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
최근 활용이 급증되고있는 비접촉 IC카드 시스템에서, 고주파수대 전파를 이용하여 정보의 대용량 고속접속을 하고자하면 IC카드내에 고주파수용 안테나의 내장이 필요하다. 본 발명은 이와 같은 고주파수용 IC카드에 적합한 안테나로써 평면형으로 인쇄기술에 의해 IC카드에 내장이 가능하도록 coplanar 급전구조의 슬롯 안테나를 고안, 설계 제작하였다. 그중 슬롯의 구조를 직선형태뿐만 아니라 듀얼편파 효과를 확인하기 위해 슬롯의 일부를 직각으로 구부린 듀얼편파 프린트형 슬롯 안테나를 제작하였으며, 이들의 제특성 측정결과에 대해 기술하였다.In the non-contact IC card system, which has been rapidly increasing in recent years, in order to use a high-capacity high-speed connection of information by using high frequency band radio waves, it is necessary to embed a high frequency antenna in the IC card. The present invention devised, designed and manufactured a slot antenna of a coplanar feeding structure so that the antenna is suitable for such a high frequency IC card and can be embedded in the IC card by a printing technology in a flat type. Among them, in order to confirm the dual polarization effect as well as the linear structure of the slot, a dual polarized print type slot antenna having a part of the slot bent at right angles was fabricated.
제특성 측정결과 직선편파 프린트형 슬롯 안테나의 경우 반사손실 30.1dB, 임피던스 52.3+j0.8Ω, -10dB 대역폭 650MHz (26.5%), E패턴의 -3dB 빔폭 78°, 이득 1dBd로 일반 다이폴 안테나와 유사한 8자 패턴의 방사특성이 얻어졌다. 듀얼편파 프린트형 슬롯 안테나의 경우 구조변형에 따른 편파특성이 얻어져 편파분리가 가능함을 확인하였다.As a result of measuring characteristics, the linearly polarized printed slot antenna has a return loss of 30.1dB, impedance of 52.3 + j0.8 Ω , -10dB bandwidth of 650MHz (26.5%), E pattern of -3dB beam width of 78 °, and gain of 1dBd. Similar eight-character pattern radiation characteristics were obtained. In the case of the dual polarized printed slot antenna, the polarization characteristic according to the structural deformation is obtained and it is confirmed that polarization separation is possible.
한편 IC카드상에서 슬롯 안테나와 메모리소자와의 사이에 부가된 스위치 연결형태에 따른 ASK식 데이터 전송 방법을 제시하였다.On the other hand, an ASK data transmission method according to a switch connection type added between a slot antenna and a memory element on an IC card is proposed.
따라서 본 발명은 coplanar 급전구조를 이용한 슬롯 안테나로 고주파수용 비접촉 무선 IC카드에 적합한 새로운 형태의 IC 카드용 프린트형 슬롯 안테나 및 데이터 전송방식의 발명에 관한 것이다.Accordingly, the present invention relates to a new type of printed slot antenna for IC cards and a data transmission method suitable for a high frequency contactless wireless IC card as a slot antenna using a coplanar feeding structure.
Description
본 발명의 목적은 비접촉식 IC카드 시스템에서 정보의 대용량 고속접속을 위하여 평면형이고 인쇄기술에 의해 제작 가능한 고주파용 coplanar 급전구조의 슬롯 안테나를 IC카드내에 장착시켜 데이터 전송기능을 갖게 하는 IC카드용 슬롯 안테나의 발명과 급전선상에 부착된 스위치 역할에 따라 ASK(Amplitude Shift Keying)식 데이터 전송방식의 발명을 목적으로 한다.An object of the present invention is to install a slot antenna of a high frequency coplanar feeding structure that can be manufactured by a flat printing technology for a high-capacity high-speed connection of information in a non-contact IC card system by mounting a slot antenna in the IC card to have a data transmission function. According to the invention and the role of the switch attached to the feed line, the purpose of the invention of the ASK (Amplitude Shift Keying) data transmission method.
본 발명이 속하는 기술분야는 무선통신의 안테나 기술분야 중 슬롯 안테나에 관한 것이다.The technical field to which the present invention pertains relates to a slot antenna in the antenna technical field of wireless communication.
최근 활용이 급증되고 있는 비접촉식 IC카드 시스템에 있어서, 고주파수대 전파를 이용하여 정보의 대용량 고속접속을 하고자 하는 경우에는 IC카드 내에 고주파수용 안테나의 내장이 필요하다.종래의 슬롯 안테나의 경우에는 동축선을 이용하여 급전하기 때문에, IC카드와 같은 평면형 구조에서는 공간상 제약을 받으며 공정도 번잡하여 비경제적이다.또한 IC카드용 안테나에 있어서, 기존의 안테나는 coplanar급전 구조를 적용한 예가 없으며, 코일을 루프나 스파이럴 형태로 감은 다층구조를 사용하고 있을 뿐, 슬롯 안테나를 사용한 경우는 전무한 상태이다.In the non-contact IC card system, which has been rapidly increasing in recent years, in order to use a high-capacity high-speed connection of information by using high-frequency band radio waves, a high-frequency antenna is required to be embedded in the IC card. Because of the power supply by using, the planar structure such as the IC card is restricted in space and the process is complicated and uneconomical. In addition, in the antenna for the IC card, there is no example of applying the coplanar power supply structure to the antenna for the IC card, I use a multi-layer structure wound in a spiral form, and no slot antenna is used.
IC 카드용 안테나에서 기존의 슬롯 안테나에 coplanar 급전구조를 적용시킴으로써, 단층구조로 마이크로파(2.45GHz) 대역에서 인쇄기술에 의해 평면으로 IC카드에 내장 가능한 IC 카드용 프린트형 슬롯 안테나를 제공하는 것을 그 목적으로 한다.By applying the coplanar feeding structure to the existing slot antenna in the antenna for the IC card, it is to provide a printed slot antenna for the IC card that can be embedded in the IC card in a single layer structure by the printing technology in the microwave (2.45 GHz) band. The purpose.
도 1은 본 발명에 따른 I C 카드용 프린트형 슬롯 안테나의 제1실시예를 개략적으로 나타내는 개념도.1 is a conceptual diagram schematically showing a first embodiment of a printed slot antenna for an I C card according to the present invention;
도 2는 본 발명에 따른 I C 카드용 프린트형 슬롯 안테나의 제1실시예에 있어서 급전선에 스위치를 부착한 상태를 개략적으로 나타내는 개념도.2 is a conceptual diagram schematically showing a state in which a switch is attached to a feed line in a first embodiment of a printed slot antenna for an IC card according to the present invention;
도 3은 본 발명에 따른 I C 카드용 프린트형 슬롯 안테나의 반사손실을 나타내는 그래프.Figure 3 is a graph showing the return loss of the printed slot antenna for the IC card according to the present invention.
도 4는 본 발명에 따른 I C 카드용 프린트형 슬롯 안테나의 방사패턴 특성을 나타내는 그래프.Figure 4 is a graph showing the radiation pattern characteristics of the printed slot antenna for the IC card according to the present invention.
도 5는 본 발명에 따른 I C 카드용 프린트형 슬롯 안테나의 제2실시예를 개략적으로 나타내는 개념도.5 is a conceptual diagram schematically showing a second embodiment of a printed slot antenna for an I C card according to the present invention;
도 6은 본 발명에 따른 I C 카드용 프린트형 슬롯 안테나의 제3실시예를 개략적으로 나타내는 개념도.6 is a conceptual diagram schematically showing a third embodiment of a printed slot antenna for an I C card according to the present invention;
본 발명에 따른 IC 카드용 프린트형 슬롯 안테나의 제1실시예는 도 1에 나타낸 바와 같이, coplanar 구조의 50Ω급전선(2) 연장 끝선이 슬롯(1)의 중심점을 가로질러 접지면(3)과 접촉되어 있으며, 이 접지면(3)에 표면전류를 형성시키고 이것이 슬롯(1)에 의해 차단됨으로써 자기적 다이폴 안테나 역할을 하게 된다. 만일 IC카드에 내장시킬 경우 인쇄기술을 이용하여 카드 중간층에 본 발명에 따른 IC 카드용 프린트형 슬롯 안테나의 제1실시예의 구조를 형성시키고 그 상하에 기존의 IC카드용 물질로 피복시켜 안테나 자체가 카드속에 내장되도록 한다. 또한 본 실시예에서는 임피던스 매칭을 쉽게 하기 위해서 급전점으로부터 슬롯(1)상의 급전선(2)을 50Ω급전선(2) 폭에 비해 상당히 좁게 함으로써 가능한 한 슬롯(1) 상에서의 급전선(2) 임피던스 매칭효과를 높이고자 하였다. 본 실시예는 직선편파 특성을 나타낸다.도면에 있어서 부호 (4) 및 (5)는 유전체(플라스틱)를 나타내고, 부호 (6)은 IC메모리를 나타낸다.상기에서 접지면(3)은 IC 카드의 내부 또는 표면에 도체막을 피복하여 형성한다.상기한 슬롯(1)은 급전선(2)이 형성되는 수직부와, 상기한 수직부의 위쪽에서 직각으로 구부려 양쪽으로 형성하는 수평부로 이루어진다.상기와 같이 구성되는 본 발명에 따른 IC 카드용 프린트형 슬롯 안테나의 제1실시예를 설계 주파수는 옥내무선용 주파수 2.450GHz로 제작하여 반사손실 및 방사패턴을 측정하고, 그 결과를 도 3 및 도 4에 나타낸다. 도 3 및 도 4에 나타낸 바와 같이, 반사손실 30.1dB, 임피던스 52.3+j0.8Ω, -10dB 대역폭 650MHz (26.5%), E패턴의 -3dB 빔폭 78°, 이득 1dBd로 일반 다이폴 안테나와 유사한 8자 패턴의 방사특성을 나타냄을 알 수 있다.그리고 질문기로부터 입사된 전파로부터 IC카드가 정보를 수신하여 데이터내용을 판단한 다음 IC카드내의 정보를 외부로 나타내고자 할 때는 도 2에 나타낸 바와 같이, coplanar급전선(2)상에 스위치(SW)를 장착시켜 50Ω급전선(2)과 연결(SW ON)시킬 시에는 슬롯(1)을 안테나로써 작용케 함으로써 IC카드에 의한 반사파를 없게 하고, 단락(short) 또는 개방(open)으로 연결(SW OFF)시에는 슬롯(1)을 안테나로 작용되지 않게 함으로써 카드 전체가 일반 도체로 되어 RCS(Rader Cross Section) 값을 크게 함으로써 IC카드내의 정보를 전송하는 방식으로 구성한다.즉 급전선(2)에 장착된 스위치(SW)가 온(on)으로 되어 급전선(2)을 연결시키면 정상적인 안테나로서 기능하고, 스위치(SW)가 오프(off)로 되어 급전선(2)의 연결을 차단시키면 슬롯(1) 전체가 반사체로 기능한다. 따라서 질문기로부터 입사되는 특정 신호의 전파에 대응하여 스위치(SW)가 특정한 패턴으로 온-오프 작동하여 정보를 IC 카드 내의 IC메모리(6)로 전달하고 IC메모리(6)에 저장된 데이터와 비교 판단하여 정해진 작업을 수행하도록 구성하는 것이 가능하다. 또 정해진 작업을 수행한 결과를 외부(예를 들면 질문기나 응답기 등)로 내보내고자 하는 경우에는 결과에 대응하여 스위치(SW)가 온-오프 작동하여 데이터를 출력하도록 구성하는 것도 가능하다.본 발명에 따른 IC 카드용 프린트형 슬롯 안테나에 의하면, 급전선(2)에 스위치를 장착하는 것에 의하여 ASK(Amplitude Shift Keying)식 데이터 전송방식으로 외부와 IC 카드 사이에 정보교환을 수행하는 것이 가능하다.도 2에는 스위치(SW)를 구성하는 2가지 방법에 대하여 나타낸다. 첫번째 방법은 급전선(2)과 50Ω라인을 연결시키면 슬롯(1)이 안테나로서 기능이 되도록 하여 IC카드의 RCS효과를 줄이고, 접지면(3)과 50Ω라인을 연결(short)시키면 슬롯(1)이 안테나 기능을 상실하여 IC카드 자체에 피복된 도체막이 반사판으로 작용하게 하여 RCS(Rader Cross Section)효과를 증가시키므로, IC카드내의 정보를 ASK식으로 데이터를 전송하도록 구성한다. 두번째 방법은 급전선(2)과 50Ω라인을 연결시키면 슬롯(1)이 안테나로서 기능이 되도록 하여 IC카드의 RCS효과를 줄이고, 급전선(2)을 개방(open)시키면 슬롯(1)이 안테나 기능을 상실하여 IC카드 자체에 피복된 도체막이 반사판으로 작용하게 하여 RCS효과를 증가시키므로, IC카드내의 정보를 ASK식으로 데이터를 전송하도록 구성한다.In the first embodiment of the printed slot antenna for an IC card according to the present invention, as shown in Fig. 1, the 50 Ω feed line 2 extending end line of the coplanar structure crosses the center point of the slot 1 to the ground plane 3. In contact with the ground plane 3, a surface current is formed in the ground plane 3, which is blocked by the slot 1, thereby acting as a magnetic dipole antenna. If it is embedded in the IC card, the structure of the first embodiment of the printed slot antenna for the IC card according to the present invention is formed on the middle layer of the card using a printing technology, and the antenna itself is coated with the material for the existing IC card. Make sure it's embedded in the card. In this embodiment, the impedance matching of the feed line 2 on the slot 1 as much as possible by making the feed line 2 on the slot 1 relatively narrower than the width of the 50 Ω feed line 2 from the feed point to facilitate impedance matching. To increase the effect. This embodiment shows linear polarization characteristics. In the drawings, numerals 4 and 5 denote dielectric materials (plastics), and numeral 6 denotes IC memories. In the above, the ground plane 3 denotes an IC card. The slot 1 is formed of a vertical portion on which the feed line 2 is formed, and a horizontal portion formed by bending at right angles from the upper portion of the vertical portion. The first embodiment of the printed slot antenna for an IC card according to the present invention is designed at a frequency of 2.450 GHz for indoor radio frequency to measure the return loss and radiation pattern, and the results are shown in FIGS. 3 and 4. 3 and 4, return loss 30.1dB, impedance 52.3 + j0.8 Ω , -10dB bandwidth 650MHz (26.5%), -3dB beamwidth 78 ° of E-pattern, and gain 1dBd. When the IC card receives the information from the radio wave incident from the interrogator, judges the data content, and then displays the information in the IC card to the outside, as shown in FIG. When the switch (SW) is mounted on the coplanar feed line (2) and the switch (SW ON) is connected to the 50 Ω feed line (2), the slot 1 acts as an antenna so that the reflected wave caused by the IC card is eliminated. When short or open (SW OFF), the slot 1 is not operated as an antenna, so the entire card becomes a general conductor, and the information in the IC card is transmitted by increasing the value of the radar cross section (RCS). To the feeder line 2 When the connected switch SW is turned on and the feeder line 2 is connected, it functions as a normal antenna, and the switch SW is turned off to cut off the connection of the feeder line 2 so that the entire slot 1 is connected. Functions as a reflector. Therefore, in response to the propagation of a specific signal incident from the interrogator, the switch SW is turned on and off in a specific pattern to transfer information to the IC memory 6 in the IC card and compare with the data stored in the IC memory 6. It is possible to configure to perform a predetermined task. In addition, when a result of performing a predetermined task is to be exported to the outside (for example, an interrogator or an answering machine), the switch SW may be configured to output data by operating on / off in response to the result. According to the IC card printed slot antenna according to the present invention, it is possible to exchange information between the IC card and the outside in an ASK (Amplitude Shift Keying) data transmission method by attaching a switch to the feed line 2. 2 shows two methods of configuring the switch SW. The first method is to connect the feeder line 2 with the 50 'line so that the slot 1 functions as an antenna to reduce the RCS effect of the IC card, and when the ground plane 3 and the 50' line are shorted, the slot 1 This antenna function is lost so that the conductor film coated on the IC card itself acts as a reflector, thereby increasing the effect of the RCS (Rader Cross Section). Thus, the information in the IC card is transmitted in an ASK manner. In the second method, when the feeder line 2 and the 50-kV line are connected, the slot 1 functions as an antenna to reduce the RCS effect of the IC card. When the feeder line 2 is opened, the slot 1 functions as an antenna. The conductive film coated on the IC card itself acts as a reflecting plate to increase the RCS effect. Therefore, the information in the IC card is transmitted in an ASK manner.
도 5 및 도 6에는 본 발명에 따른 IC 카드용 프린트형 슬롯 안테나의 제2실시예 및 제3실시예를 나타내며, 듀얼편파 및/또는 원편파의 특성을 나타내도록 구조를 변형시켜 편파분리가 가능하게 한다. 즉 도 5에 나타낸 바와 같이 슬롯(1)의 양쪽 끝부분을 각각 한쪽은 위쪽으로 다른쪽은 아래쪽으로 향하여 직각으로 구부려 형성하는 것에 의하여 듀얼편파 및 원편파 특성을 얻고, 도 6에 나타낸 바와 같이 슬롯(1)의 한쪽 끝부분을 위쪽으로 향하여 직각으로 구부리고 다른쪽은 중간부분부터 위쪽으로 향하여 직각으로 구부린 다음 다시 수평으로 구부려 형성하는 것에 의하여 원편파 특성을 얻는다.본 발명에 따른 IC 카드용 프린트형 슬롯 안테나의 제2실시예는 도 5에 나타낸 바와 같이, 상기한 슬롯(1)의 수평부 양쪽 끝부분을 위쪽 또는 아래쪽으로 서로 반대방향으로 직각으로 구부려 형성한다.본 발명에 따른 IC 카드용 프린트형 슬롯 안테나의 제3실시예는 도 6에 나타낸 바와 같이, 상기한 슬롯(1)의 수평부 한쪽 끝부분을 위쪽 또는 아래쪽으로 직각으로 구부리고, 다른쪽 부분을 중앙부에서 상기한 한쪽 끝부분과 동일 또는 반대방향인 위쪽 또는 아래쪽으로 직각으로 구부린 다음 끝부분을 다시 수평방향으로 직각으로 구부려 형성하고, 급전선(2)을 45°각도로 형성한다. 상기와 같이 형성하는 것에 의하여 90°의 위상차를 갖는 원편파를 얻을 수 있다.또 도면에 나타내지 않았지만, 슬롯(1)을 곡선형으로 돌려 형성하는 경우에도 원편파 특성을 얻는 것이 가능하다.5 and 6 show a second embodiment and a third embodiment of a printed slot antenna for an IC card according to the present invention, and polarization separation is possible by modifying the structure to show the characteristics of dual polarization and / or circular polarization. Let's do it. That is, as shown in FIG. 5, both ends of the slot 1 are bent at right angles to one side and the other side downward to obtain dual polarization and circular polarization characteristics, and as shown in FIG. 6. Circular polarization characteristics are obtained by bending one end of (1) upward at a right angle and bending the other at a right angle from the middle to upward and then horizontally bending it. A printed type for an IC card according to the present invention In the second embodiment of the slot antenna, as shown in Fig. 5, both ends of the horizontal portion of the slot 1 are bent upwardly or downwardly at right angles in opposite directions to each other. As shown in FIG. 6, the third embodiment of the slot antenna has at least one horizontal end of the slot 1 perpendicularly upward or downward. Bent at the center, and the other part is bent at a right angle upward or downward in the same or opposite direction from the one end at the center, and then bent at the end again at a right angle in the horizontal direction, and the feed line 2 is formed at a 45 ° angle. Form. By forming as described above, circularly polarized waves having a phase difference of 90 ° can be obtained. In addition, although not shown in the drawing, circularly polarized wave characteristics can be obtained even when the slot 1 is formed by turning it into a curved shape.
상기와 같이 이루어지는 본 발명에 따른 IC 카드용 프린트형 슬롯 안테나에 의하면, coplanar 급전구조를 이용하므로 기존의 동축선으로 급전하던 슬롯 안테나에선 불가능했던 박막화가 가능하다.According to the printed slot antenna for the IC card according to the present invention made as described above, because the coplanar feeding structure is used, it is possible to thin the film was impossible in the slot antenna that was fed by the conventional coaxial line.
또한 질문기로부터의 수신전파를 이용하여 카드에서 필요로 하는 전원을 효율 좋게 공급하기에 용이할 뿐 아니라, 안테나 기능을 없앨 시 카드 자체에 의한 RCS가 크게 될 수 있어서, 급전선에 스위치를 장착하면 안테나 기능 유·무에 의한 데이터 전송 방식을 사용할 수 있다.In addition, it is easy to efficiently supply the power required by the card by using the received radio wave from the interrogator, and the RCS by the card itself can be increased when the antenna function is removed. A data transmission method with or without a function can be used.
Claims (9)
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| KR10-2000-0005269A KR100374064B1 (en) | 2000-02-02 | 2000-02-02 | Printed Slot Antenna for IC-card |
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