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Shaping near-field emission signals

A technology for transmitting signals and near-field communication. It is applied in near-field transmission systems, electrical components, transmission systems, etc., and can solve problems such as impact, damage to the integrity of the RF field of the transmitted data signal, and communication interruption.

Active Publication Date: 2017-04-05
MARVELL ASIA PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the transmitting device's antenna may be affected by mutual inductance with the receiving device's antenna
While this mutual inductance can contribute to data transmission to the receiving device, changes in mutual inductance often affect or distort the transmitted signal or RF field generated by the transmitting device
[0005] Distortion due to variable mutual inductance can compromise the integrity of the RF field in which the data signal is transmitted, which can lead to communication disruption or data loss
Typical solutions for reducing these distortions of the RF field often rely on reducing the quality factor of the antenna by adding resistors to the antenna interface circuit

Method used

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  • Shaping near-field emission signals
  • Shaping near-field emission signals
  • Shaping near-field emission signals

Examples

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Embodiment Construction

[0021] Conventional techniques for reducing RF field distortion caused by varying coupling conditions, such as reducing the antenna's quality factor, often impair the communication capabilities of the transceiver. For example, adding quality factor reducing resistors to the antenna network reduces the power efficiency of the transmitter, reduces the sensitivity of the receiver, and / or reduces the frequency selectivity of the transmitter associated with the antenna network. This disclosure describes apparatus and techniques for shaping short-range transmit signals that effectively reduce RF field distortion associated with coupling conditions.

[0022] As an example, consider two devices implementing near field communication (NFC) to transmit data. In NFC, a first device (eg, polling device) actively transmits a signal to a second device (eg, listening device). To this end, a first device generates a high-frequency alternating magnetic field, which is coupled to a second devic...

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Abstract

This disclosure describes apparatus and techniques for shaping near-field transmitted signals. In some aspects, the baseband data signal is shaped based on coupling conditions of the antenna. A radio frequency (RF) carrier signal is modulated with a shaped baseband data signal to provide a shaped transmit signal, which is then applied to an antenna to generate an RF field. The shaped transmit signal may be effective in reducing distortion of the RF field associated with coupling conditions.

Description

[0001] Cross References to Related Applications [0002] This disclosure claims priority to U.S. Patent Application Serial No. 13 / 932,797, filed July 1, 2013, filed July 2, 2012 pursuant to 35 U.S.C. § 119(e) Priority to US Provisional Patent Application Serial No. 61 / 667,107, the disclosure of which is hereby incorporated by reference in its entirety. Background technique [0003] The background description provided herein is for the purpose of generally presenting the context of the disclosure. To the extent of the work described in this Background section and aspects of the description that would not otherwise constitute prior art at the time of filing, the work of the present inventors is neither express nor implied to be admitted as relative to the present invention. Published prior art. [0004] Wireless communications between computing devices or circuits are often transmitted as modulated radio frequency (RF) fields. A transmitting device typically encodes a signal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B5/00
CPCH04B5/24H04B5/266H04B5/70H04B5/72
Inventor M·康塔尔多F·德克勒克
Owner MARVELL ASIA PTE LTD