Invention Grant
- Patent Title: Carrier frequency variation for device detection in near-field communications
- Patent Title (中): 近场通信中设备检测的载波频率变化
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Application No.: US13650031Application Date: 2012-10-11
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Publication No.: US09124302B2Publication Date: 2015-09-01
- Inventor: Koushik Krishnan , Rainer Gaethke , Faramarz Sabouri
- Applicant: Qualcomm Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Mahamedi Paradice LLP
- Main IPC: H04B5/00
- IPC: H04B5/00 ; H04B17/11
Abstract:
A near-field communications (NFC) device includes an NFC antenna, a matching network coupled to the NFC antenna, and a transmitter coupled to the matching network. The transmitter applies a signal to the matching network and varies a frequency of the signal. A parameter is measured while varying the frequency of the signal. A peak value of the parameter is identified and compared to a threshold. A communication protocol is initiated in response to a determination that the peak value satisfies the threshold.
Public/Granted literature
- US20140106669A1 CARRIER FREQUENCY VARIATION FOR DEVICE DETECTION IN NEAR-FIELD COMMUNICATIONS Public/Granted day:2014-04-17
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