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Communication device for motor vehicle

A technology for communication devices and motor vehicles, applied in the field of antenna circuits, can solve the problems that the frequency response of the carrier frequency varies greatly, the order of magnitude is equal to the antenna current, and the result is not as expected.

Active Publication Date: 2019-09-13
HUF HULSBECK & FURST GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0017] However, a system adapted and designed according to the prior art leads to problems in the carrier frequency range in that the input current is often greater than the antenna current, but is always equal in magnitude to the antenna current
Also, the frequency response to the carrier frequency varies widely and irregularly, so slight frequency shifts dictated by part tolerances can lead to less-than-expected results

Method used

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  • Communication device for motor vehicle
  • Communication device for motor vehicle
  • Communication device for motor vehicle

Examples

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Embodiment Construction

[0033] exist Figure 1a A schematic diagram of a circuit simulation for driving an NFC antenna is shown in . Part A represents the power grid for EMV filtering, part B represents the impedance matching circuit, and part C is the equivalent circuit diagram of the antenna array. In this example, the antenna parameters are 808 nH at a frequency of 11.68 MHz and its coil resistance is 390 mOhm.

[0034] The circuit shown is optimized according to the driver circuit manufacturer's requirements, first considering the antenna (C) and its measured performance, followed by the impedance matching device (B), and finally the filtering device (A) and finally the optimized device.

[0035] exist Figure 1b shown in the upper part of the Figure 1a Filter curve for the circuit shown. exist Figure 1b The frequency responses of the antenna current (AnC) and the input current (InC) are shown in the lower part of .

[0036] It is clearly seen that in this example the input current is above...

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Abstract

A communication device for a motor vehicle having a near field communication device, the communication device includes an antenna portion, a drive circuit, and a matching circuit and a filter circuit provided between the drive circuit and the antenna coil. The antenna part forms an electrical tank circuit having a first resonance frequency. The matching circuit and the filter circuit form at least one second oscillating circuit with the second resonant frequency, and the first oscillating circuit is coupled with the second oscillating circuit according to the critical coupling method.

Description

technical field [0001] The invention relates to an antenna circuit, in particular an antenna matching circuit for employing a transmitting antenna for near field communication. Background technique [0002] As is generally known in the prior art, Near Field Communication (NFC) is a communication technology that enables authentication, data exchange or payment processes by bringing two transmitting / receiving devices close to each other. [0003] Near Field Communication is a contactless technology that operates in the megahertz (typically 13.56 MHz) range using an inductive loop antenna. [0004] There are many ways in the prior art to drive such loop antennas in a cost-optimized but also quality-optimized manner. [0005] For example, patent document DE102013015736A1 discloses an antenna matching circuit with a symmetrical filter circuit. Furthermore, various standardization works are known which contain specific requirements for near-field-NFC-communication systems. Exam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04H03H7/01H03H7/38
CPCH03H7/38
Inventor 贝特霍尔德·西格
Owner HUF HULSBECK & FURST GMBH & CO KG
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