The functions of the low-frequency antenna in the car of Pacific Automotive Network: 1. It is mainly used to receive external signals. The car owner can listen to the radio in the car, relying on the function of the antenna; 2. There are also some special functions. The function of the antenna on the police car is to receive mobile radio stations, especially the police's special band information; 3. The car antenna is also a static discharger, which mainly discharges the static electricity accumulated in the car shell to protect passenger safety and body circuits.
Manufacturing method of wearable device with metal shell and NFC function Technical field 0001 The utility model relates to the technical field of wearable devices, and in particular to a wearable device with metal shell and NFC function. BACKGROUND OF THE INVENTION 0002 Near Field Communication (Near Field Communication, referred to as "NFC") is a short-range, high-frequency radio technology that operates at a frequency of 13.56 MHz within a distance of 10 to 20 centimeters. NFC can provide easy, safe, and fast automatic communication between various devices, and is widely used in access control, public transportation, mobile payment, wearable device communication and other fields. 0003 Existing wearable devices tend to use metal casings, but metal casings will have serious eddy current effects on the NFC antenna, resulting in a shortened NFC communication distance of the wearable device. Moreover, because the NFC function needs to be turned on all the time, the existing Wearable devices don’t have enough battery life. SUMMARY OF THE INVENTION 0004 In order to solve the problem in the prior art that the metal shell of a wearable device affects the NFC communication distance and the wearable device with NFC function has poor battery life, embodiments of the present invention provide a device with a metal shell and NFC-enabled wearable devices. The technical solution is as follows: 0005 Embodiments of the present utility model provide a wearable device with a metal casing and NFC function, including: 0006 a metal casing, an NFC chip installed in the metal casing, and connected to the NFC chip NFC antenna, a booster chip connected to the NFC chip and the NFC antenna respectively, the metal shell includes an open-ring metal upper shell and an open-ring metal lower shell, 0007 the wearable device also includes: a power supply, A first control circuit, a second control circuit, a first low-frequency antenna, a processor, and a third control circuit. The power supply is electrically connected to the processor and is electrically connected to the first low-frequency antenna through the first control circuit. connection, the first low-frequency antenna is electrically connected to the processor through the first control circuit and the second control circuit, and the processor is electrically connected to the NFC chip through the third control circuit, 0008 The card reader that cooperates with the wearable device is provided with a second low-frequency antenna that cooperates with the first low-frequency antenna. When the distance between the first low-frequency antenna and the second low-frequency antenna is less than the preset distance, the first low-frequency antenna sends a first control signal to the processor through the first control circuit, and the processor sends a first control signal to the third control circuit based on the first control signal. Two control signals are used to control the NFC chip to start working. On the other hand, a third control signal is sent to the second control circuit to close the discharge path of the first low-frequency antenna. When the work of the NFC chip is completed, The NFC chip sends a fourth control signal to the processor through the third control circuit, and the processor sends a fifth control signal to the second control circuit according to the fourth control signal to turn on the The discharge path of the first low-frequency antenna.
(Pictures/Text/Photos: Pacific Automotive Network Question and Answer Calling the Beast)