KR20200053345A - Smart key - Google Patents

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Publication number
KR20200053345A
KR20200053345A KR1020180136855A KR20180136855A KR20200053345A KR 20200053345 A KR20200053345 A KR 20200053345A KR 1020180136855 A KR1020180136855 A KR 1020180136855A KR 20180136855 A KR20180136855 A KR 20180136855A KR 20200053345 A KR20200053345 A KR 20200053345A
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KR
South Korea
Prior art keywords
antenna
vehicle
wireless power
smart key
communicate
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KR1020180136855A
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Korean (ko)
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KR102672188B1 (en
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진병수
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주식회사 아모센스
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Priority to KR1020180136855A priority Critical patent/KR102672188B1/en
Publication of KR20200053345A publication Critical patent/KR20200053345A/en
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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • G07C2009/00341—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks keyless data carrier having more than one limited data transmission ranges
    • G07C2009/00357—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks keyless data carrier having more than one limited data transmission ranges and the lock having more than one limited data transmission ranges
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00579—Power supply for the keyless data carrier
    • G07C2009/00603—Power supply for the keyless data carrier by power transmission from lock
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00793—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by Hertzian waves
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00968—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys shape of the data carrier
    • G07C2009/00984—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys shape of the data carrier fob

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lock And Its Accessories (AREA)

Abstract

Disclosed is a smart key capable of charging power through wireless power transmission and performing wireless communication with a vehicle based on charged power to control vehicle functions. The smart key includes: a wireless power receiving antenna receiving wireless power from a wireless power transmitting antenna installed in the vehicle; and a first antenna driven by the wireless power received from the wireless power receiving antenna and communicating with the vehicle. The first antenna is a UWB antenna and the first antenna can communicate with the vehicle through an anchor installed in the vehicle. At this time, the first antenna may communicate with a mobile terminal through the anchor installed in the vehicle.

Description

스마트 키{SMART KEY}Smart key {SMART KEY}

본 발명은 스마트 키에 관한 것으로, 더욱 상세하게는 차량과의 무선 통신을 통해 차량을 제어하는 스마트 키에 관한 것이다.The present invention relates to a smart key, and more particularly, to a smart key for controlling the vehicle through wireless communication with the vehicle.

최근에는 차량마다 무선 통신을 통해 차량의 다양한 기능을 제어하는 스마트 키가 적용되고 있다. 스마트 키는 차량과의 무선 통신을 위한 안테나 모듈, 안테나 모듈로 구동 전력을 제공하는 전원 모듈을 포함한다.Recently, smart keys for controlling various functions of a vehicle through wireless communication have been applied to each vehicle. The smart key includes an antenna module for wireless communication with a vehicle, and a power supply module that provides driving power to the antenna module.

스마트 키는 차량의 제어 유닛과 무선 통신을 통해 암호화 데이터를 송신하여 기기 인증을 수행한다. 스마트 키는 기기 인증이 완료되면 차량과의 무선 통신(LF, RF)을 통해 차량의 도어 잠금, 도어 잠금 해제, 원격 시동, 라이트 점등/점멸, 자동 잠금 등의 기능을 제어할 수 있다.The smart key performs device authentication by transmitting encrypted data through wireless communication with the vehicle's control unit. When the device authentication is completed, the smart key can control functions such as door lock of the vehicle, door unlock, remote start, light on / off, auto lock through wireless communication (LF, RF) with the vehicle.

한국공개특허 제10-2018-0116826호(명칭: 카드형 스마트키 및 그 제어방법)Korean Patent Publication No. 10-2018-0116826 (Name: Card type smart key and control method thereof)

본 발명은 상기한 종래의 문제점을 해결하기 위해 제안된 것으로, 무선 전력 전송을 통해 전력을 충전하고, 충전된 전력에 의해 차량과 무선 통신을 수행하여 차량의 기능을 제어하도록 한 스마트 키를 제공하는 것을 목적으로 한다.The present invention has been proposed to solve the above-described conventional problems, and provides a smart key to control power of a vehicle by charging power through wireless power transmission and performing wireless communication with the vehicle by the charged power. It is aimed at.

또한, 본 발명의 실시 예에 따른 스마트 키는 LF 통신 및 UWB 통신 중 하나를 선택하여 차량과 통신하도록 하는 것을 다른 목적으로 한다.In addition, the smart key according to an embodiment of the present invention has another purpose to select one of LF communication and UWB communication to communicate with the vehicle.

상기한 목적을 달성하기 위하여 본 발명의 실시 예에 따른 스마트 키는 차량에 설치된 무선 전력 송신용 안테나로부터 무선 전력을 수신하는 무선 전력 수신용 안테나 및 무선 전력 수신용 안테나에서 수신한 무선 전력을 통해 구동하여 차량과 통신하는 제1 안테나를 포함한다. 제1 안테나는 UWB 안테나이고, 제1 안테나는 차량에 설치된 앵커를 통해 차량과 통신할 수 있다. 이때, 제1 안테나는 차량에 설치된 앵커를 통해 휴대 단말과 통신할 수도 있다.In order to achieve the above object, the smart key according to an embodiment of the present invention is driven through a wireless power receiving antenna that receives wireless power from an antenna for wireless power transmission installed in a vehicle and wireless power received from a wireless power receiving antenna. It includes a first antenna to communicate with the vehicle. The first antenna is a UWB antenna, and the first antenna can communicate with the vehicle through an anchor installed in the vehicle. At this time, the first antenna may communicate with the mobile terminal through the anchor installed in the vehicle.

본 발명의 실시 예에 따른 스마트 키는 무선 전력 수신용 안테나에서 수신한 무선 전력을 통해 구동하여 제1 안테나와 다른 주파수 대역을 통해 차량과 통신하는 제2 안테나를 더 포함하고, 제2 안테나는 LF 안테나일 수 있다.The smart key according to an embodiment of the present invention further includes a second antenna that is driven through the wireless power received from the antenna for wireless power reception to communicate with the vehicle through a different frequency band from the first antenna, and the second antenna is the LF. It can be an antenna.

본 발명에 의하면, 스마트 키는 무선 전력 전송을 통해 전력을 충전하고, 충전된 전력에 의해 차량과 무선 통신을 수행하여 차량의 기능을 제어함으로써, 스마트 키의 배터리 교체를 최소화할 수 있다.According to the present invention, the smart key charges power through wireless power transmission, and performs wireless communication with the vehicle by the charged power to control the function of the vehicle, thereby minimizing battery replacement of the smart key.

또한, 스마트 키는 LF 통신 및 UWB 통신 중 하나를 선택하여 차량과 통신함으로써, LF 안테나만을 이용하는 종래에 비해 차량과의 통신 성능을 향상시킬 수 있는 효과가 있다.In addition, the smart key communicates with a vehicle by selecting one of LF communication and UWB communication, and thus has an effect of improving communication performance with a vehicle as compared to a conventional method using only an LF antenna.

또한, 또한, 스마트 키는 LF 통신 및 UWB 통신 중 하나를 선택하여 차량과 통신함으로써, 기존 스마트 키에서 제어가 가능한 기능 이외에도 차량의 다른 기능을 제어할 수 있는 효과가 있다.In addition, the smart key communicates with the vehicle by selecting one of LF communication and UWB communication, thereby having the effect of controlling other functions of the vehicle in addition to the functions that can be controlled by the existing smart key.

도 1 내지 도 3은 본 발명의 실시 예에 따른 스마트 키를 설명하기 위한 도면.1 to 3 are views for explaining a smart key according to an embodiment of the present invention.

이하, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 본 발명의 기술적 사상을 용이하게 실시할 수 있을 정도로 상세히 설명하기 위하여, 본 발명의 가장 바람직한 실시 예를 첨부 도면을 참조하여 설명하기로 한다. 우선 각 도면의 구성요소들에 참조부호를 부가함에 있어서, 동일한 구성요소들에 대해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호를 가지도록 하고 있음에 유의해야 한다. 또한, 본 발명을 설명함에 있어, 관련된 공지 구성 또는 기능에 대한 구체적인 설명이 본 발명의 요지를 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명은 생략한다.Hereinafter, with reference to the accompanying drawings, the most preferred embodiments of the present invention will be described in detail so that those skilled in the art to which the present invention pertains can easily implement the technical spirit of the present invention. . First, when adding reference numerals to the components of each drawing, it should be noted that the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in describing the present invention, when it is determined that detailed descriptions of related well-known structures or functions may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

도 1을 참조하면, 본 발명의 실시 예에 따른 스마트 키(100)는 차량(10)과의 통신, 차량(10)을 통해 휴대 단말(20)과의 통신을 지원한다. 즉, 스마트 키(100)는 LF 통신 또는 UWB 통신을 통해 차량(10)과 통신하고, UWB 통신을 통해 휴대 단말(20)과 통신을 수행한다. 이때, 스마트 키(100)는 인증 정보, 제어 정보 등의 차량(10) 관련 정보를 차량(10) 또는 휴대 단말(20)과 송수신한다.Referring to FIG. 1, the smart key 100 according to an embodiment of the present invention supports communication with the vehicle 10 and communication with the mobile terminal 20 through the vehicle 10. That is, the smart key 100 communicates with the vehicle 10 through LF communication or UWB communication, and communicates with the mobile terminal 20 through UWB communication. At this time, the smart key 100 transmits and receives information related to the vehicle 10 such as authentication information and control information to and from the vehicle 10 or the mobile terminal 20.

도 2를 참조하면, 스마트 키(100)는 인쇄회로기판(110), 무선 전력 수신용 안테나(120), 제2 안테나(140) 및 제1 안테나(130)를 포함한다. 여기서, 도 2에서는 스마트 키(100)의 일례를 도시한 것으로, 무선 전력 수신용 안테나(120), 제1 안테나(130) 및 제2 안테나(140)의 위치, 형상, 크기 등은 다양하게 변형이 가능하므로 도면에 한정되지 않는다.Referring to FIG. 2, the smart key 100 includes a printed circuit board 110, an antenna 120 for receiving wireless power, a second antenna 140 and a first antenna 130. Here, FIG. 2 shows an example of the smart key 100, and the position, shape, size, etc. of the antenna 120 for wireless power reception, the first antenna 130, and the second antenna 140 are variously modified. Since this is possible, it is not limited to the drawings.

인쇄회로기판(110)은 인증, 제어 등을 수행하는 제어 회로(112)가 형성된 기판이다. 인쇄회로기판(110)은 제어 회로(112)를 구성하기 위한 다양한 소자들이 실장될 수 있다. 인쇄회로기판(110)은 스마트 키(100)의 구동 전력 공급을 위한 배터리(116)가 연결될 수 있다. 이때, 인쇄회로기판(110)은 디스플레이 모듈(114)과 연결될 수도 있다.The printed circuit board 110 is a substrate on which a control circuit 112 that performs authentication, control, and the like is formed. The printed circuit board 110 may be mounted with various elements for configuring the control circuit 112. The printed circuit board 110 may be connected to a battery 116 for supplying driving power of the smart key 100. At this time, the printed circuit board 110 may be connected to the display module 114.

무선 전력 수신용 안테나(120)는 인쇄회로기판(110) 상에 형성된다. 무선 전력 수신용 안테나(120)는 차량(10)에 실장된 무선 전력 송신용 안테나와의 무선 전력 전송을 통해 무선 전력을 수신한다. 무선 전력 수신용 안테나(120)는 수신한 무선 전력을 이용하여 인쇄회로기판(110)에 연결된 배터리(116)를 충전한다. 무선 전력 수신용 안테나(120)는 WPC 안테나인 것을 일례로 한다.The antenna 120 for wireless power reception is formed on the printed circuit board 110. The antenna 120 for wireless power reception receives wireless power through wireless power transmission with an antenna for wireless power transmission mounted on the vehicle 10. The antenna 120 for wireless power reception uses the received wireless power to charge the battery 116 connected to the printed circuit board 110. For example, the antenna 120 for wireless power reception is a WPC antenna.

도 3을 참조하면, 스마트 키(100)가 차량(10)에 설치된 무선 충전 영역에 삽입됨에 따라, 무선 전력 수신용 안테나(120)는 차량(10)의 무선 전력 송신용 안테나와 정렬되어 무선 전력 전송을 수행한다. 무선 전력 수신용 안테나(120)는 수신한 무선 전력을 이용하여 배터리(116)를 충전한다.Referring to FIG. 3, as the smart key 100 is inserted into the wireless charging area installed in the vehicle 10, the antenna for wireless power reception 120 is aligned with the antenna for wireless power transmission of the vehicle 10 to wireless power Perform transmission. The antenna 120 for wireless power reception charges the battery 116 using the received wireless power.

제1 안테나(130)는 차량(10)에 설치된 앵커(Anchor)를 통해 차량(10)과 무선 통신한다. 제1 안테나(130)는 앵커를 통해 차량(10)과 통신하여 인증 정보, 제어 정보 등을 전송한다. 제1 안테나(130)는 차량(10)에 설치된 앵커를 통해 사용자의 휴대 단말(20)과 무선 통신을 수행할 수도 있다. 여기서, 제1 안테나(130)는 UWB 안테나인 것을 일례로 한다.The first antenna 130 wirelessly communicates with the vehicle 10 through an anchor installed in the vehicle 10. The first antenna 130 communicates with the vehicle 10 through an anchor to transmit authentication information, control information, and the like. The first antenna 130 may perform wireless communication with the user's portable terminal 20 through an anchor installed in the vehicle 10. Here, it is assumed that the first antenna 130 is a UWB antenna.

제2 안테나(140)는 차량(10)과의 무선 통신을 통해 인증 정보, 제어 정보 등을 차량(10)으로 전송한다. 이때, 제2 안테나(140)는 차량(10)에 설치된 복수의 제2 안테나(140)와 무선 통신을 통해 인증 정보, 제어 정보 등을 전송한다. 여기서, 제2 안테나(140)는 LF 안테나인 것을 일례로 한다.The second antenna 140 transmits authentication information, control information, and the like to the vehicle 10 through wireless communication with the vehicle 10. At this time, the second antenna 140 transmits authentication information, control information, and the like through wireless communication with the plurality of second antennas 140 installed in the vehicle 10. Here, it is assumed that the second antenna 140 is an LF antenna.

한편, 차량(10)에는 복수의 LF 안테나 또는 복수의 앵커가 실장된다. 차량(10)은 복수의 앵커를 통해 스마트 키(100)에 실장된 제1 안테나(130)와 통신하여 스마트 키(100)의 위치를 검출할 수 있다. 차량(10)은 복수의 LF 안테나를 통해 스마트 키(100)에 실장된 제2 안테나(140)와 통신하여 스마트 키(100)의 위치를 검출할 수 있다. Meanwhile, a plurality of LF antennas or a plurality of anchors are mounted on the vehicle 10. The vehicle 10 may detect the location of the smart key 100 by communicating with the first antenna 130 mounted on the smart key 100 through a plurality of anchors. The vehicle 10 may detect the location of the smart key 100 by communicating with the second antenna 140 mounted on the smart key 100 through a plurality of LF antennas.

스마트 키(100)는 차량(10)과의 통신을 통해 차량(10)에 설치된 LF 안테나 또는 앵커를 식별한다. 스마트 키(100)는 식별 결과에 따라 제1 안테나(130) 또는 제2 안테나(140)를 구동시킨다. 즉, 스마트 키(100)는 차량(10)에서 앵커가 식별되면 제1 안테나(130)를 구동시켜 차량(10)과 통신한다. 스마트 키(100)는 제1 안테나(130) 및 차량(10)의 앵커를 통해 휴대 단말(20)과 무선 통신을 수행할 수도 있다. 스마트 키(100)는 차량(10)에서 LF 안테나가 식별되면 제2 안테나(140)를 구동시켜 차량(10)과 통신한다. The smart key 100 identifies an LF antenna or anchor installed in the vehicle 10 through communication with the vehicle 10. The smart key 100 drives the first antenna 130 or the second antenna 140 according to the identification result. That is, when the anchor is identified in the vehicle 10, the smart key 100 drives the first antenna 130 to communicate with the vehicle 10. The smart key 100 may perform wireless communication with the mobile terminal 20 through the anchors of the first antenna 130 and the vehicle 10. When the LF antenna is identified in the vehicle 10, the smart key 100 drives the second antenna 140 to communicate with the vehicle 10.

이상에서 본 발명에 따른 바람직한 실시 예에 대해 설명하였으나, 다양한 형태로 변형이 가능하며, 본 기술분야에서 통상의 지식을 가진자라면 본 발명의 특허청구범위를 벗어남이 없이 다양한 변형 예 및 수정 예를 실시할 수 있을 것으로 이해된다.The preferred embodiment according to the present invention has been described above, but various modifications and modifications are possible without departing from the scope of the claims of the present invention. It is understood that it can be practiced.

10: 차량 20: 휴대 단말
100: 스마트 키 110: 인쇄회로기판
112: 제어 회로 114: 디스플레이 모듈
116: 배터리 120: 무선 전력 수신용 안테나
130: 제1 안테나 140: 제2 안테나10: vehicle 20: mobile terminal
100: smart key 110: printed circuit board
112: control circuit 114: display module
116: battery 120: antenna for wireless power reception
130: first antenna 140: second antenna

Claims (6)

차량에 설치된 무선 전력 송신용 안테나로부터 무선 전력을 수신하는 무선 전력 수신용 안테나; 및
상기 무선 전력 수신용 안테나에서 수신한 무선 전력을 통해 구동하여 상기 차량과 통신하는 제1 안테나를 포함하는 스마트 키.A wireless power receiving antenna for receiving wireless power from a wireless power transmitting antenna installed in a vehicle; And
A smart key including a first antenna that is driven through wireless power received from the wireless power receiving antenna to communicate with the vehicle. 제1항에 있어서,
상기 제1 안테나는 UWB 안테나인 스마트 키.According to claim 1,
The first antenna is a UWB smart key. 제2항에 있어서,
상기 제1 안테나는 상기 차량에 설치된 앵커를 통해 상기 차량과 통신하는 스마트 키.According to claim 2,
The first antenna is a smart key that communicates with the vehicle through an anchor installed in the vehicle. 제2항에 있어서,
상기 제1 안테나는 상기 차량에 설치된 앵커를 통해 휴대 단말과 통신하는 스마트 키.According to claim 2,
The first antenna is a smart key that communicates with a mobile terminal through an anchor installed in the vehicle. 제1항에 있어서,
상기 무선 전력 수신용 안테나에서 수신한 무선 전력을 통해 구동하여 상기 제1 안테나와 다른 주파수 대역을 통해 차량과 통신하는 제2 안테나를 더 포함하는 스마트 키.According to claim 1,
The smart key further includes a second antenna that is driven through the wireless power received from the wireless power receiving antenna to communicate with the vehicle through a different frequency band from the first antenna. 제5항에 있어서,
상기 제2 안테나는 LF 안테나인 스마트 키.The method of claim 5,
The second antenna is a smart key that is an LF antenna.
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