LC Tank Antenna Coil Tuning via Channel Sounding Signal
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Solution Overview
Problem
Existing antenna coil tuning methods for Near-Field Magnetic Induction (NFMI) and Near Field Communication (NFC) systems are inefficient, requiring multiple tone measurements and significant time for tuning, which reduces data rate and increases power consumption due to the need for continuous antenna circuit driving during the tuning process.
Innovation Solution
An integrated circuit with an inductive-capacitive (LC) tank antenna circuit that uses a single channel sounding signal (CSS) to estimate the tank response and adjust the reactance to resonate at a predetermined carrier frequency, allowing for fast and efficient tuning by determining the oscillation frequency and adjusting the variable capacitor or inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple tone measurements are used for antenna coil tuning, then tuning accuracy is improved, but tuning time and power consumption increase
Solution Approach 1:
The patent applies preliminary action by performing a single channel sounding signal measurement before actual data transmission to pre-determine the oscillation frequency and adjust the variable capacitor accordingly. This preliminary tuning action eliminates the need for multiple measurements during operation, thereby reducing tuning time while maintaining accuracy.
Solution Approach 2:
The patent extracts only the essential information needed for tuning by using a single channel sounding signal instead of multiple tone measurements. By taking out only the necessary frequency identification step and removing unnecessary iterative measurements, the system achieves accurate tuning with minimal time loss.
2Measurement precision
If multiple tone measurements are used for antenna coil tuning, then tuning accuracy is improved, but power consumption increases
Solution Approach 1:
The patent performs the tuning measurement as a preliminary action before data transmission begins. By completing the frequency identification and capacitor adjustment in advance using a single channel sounding signal, the system avoids continuous power-consuming measurements during operation, thereby reducing overall power consumption while maintaining tuning accuracy.
Solution Approach 2:
The patent extracts only the essential frequency information from a single measurement rather than performing multiple measurements. This extraction approach obtains sufficient tuning data with minimal energy expenditure, eliminating wasteful repeated measurements that would increase power consumption.
3Measurement precision
If iterative tuning measurements are performed, then frequency identification accuracy is improved, but data rate decreases
Solution Approach 1:
The patent performs frequency identification as a preliminary action using a single channel sounding signal before actual data transmission. This one-time preliminary measurement establishes accurate frequency identification without requiring iterative measurements during data transmission, thereby maintaining high data rates while ensuring frequency accuracy.
Solution Approach 2:
The patent extracts the necessary frequency identification information from a single channel sounding signal measurement rather than requiring multiple iterative measurements. This extraction of essential information enables accurate frequency identification with minimal interruption to data transmission, preserving high data rates.
4Measurement precision
If continuous antenna circuit driving is performed during tuning, then tuning measurements can be completed, but power consumption increases
Solution Approach 1:
The patent completes all necessary tuning measurements as a preliminary action before actual operation using a single channel sounding signal. This preliminary completion of measurements eliminates the need for continuous driving during data transmission, thereby reducing power consumption while ensuring accurate tuning is achieved.
Solution Approach 2:
The patent extracts sufficient tuning information from a single measurement rather than requiring continuous measurements. This extraction approach obtains the necessary frequency and capacitance adjustment data with minimal antenna circuit driving, reducing power consumption while completing the tuning objective.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables rapid and accurate tuning of the antenna coil, reducing power consumption and system throughput impact, allowing for immediate oscillation frequency identification without iterations, and providing high accuracy and flexibility in bandwidth selection.
Implementation Method 1
an inductive-capacitive (LC) tank antenna circuit designed to operate at a predetermined carrier frequency
Implementation Method 2
Near field magnetic induction (NFMI)
Implementation Method 3
a controller to adjust a reactance of the LC tank antenna circuit to resonate the LC tank antenna circuit and change the oscillation frequency to the predetermined carrier frequency
Data Source
Figure 1~2
Figure 3~4
AI summary
Disclosed is an integrated circuit for a near-field radio, including an inductive-capacitive (LC) tank antenna circuit designed to operate at a predetermined carrier frequency, the tank LC tank antenna circuit including a variable capacitor and an antenna element, a transmitter configured to output a channel sounding signal (CSS) to the LC tank antenna circuit, a receiver to receive the CSS and a tank response from the LC tank antenna circuit, a tank response estimator to extract the tank response of the LC tank antenna circuit by removing the CSS from the received signal and determining an oscillation frequency of the LC tank antenna circuit, and a controller to adjust a reactance of the LC tank antenna circuit to resonate the LC tank antenna circuit and change the oscillation frequency to the predetermined carrier frequency.