RF Channel Signal Differentiation via Phase Modulation
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Solution Overview
Problem
Existing methods for analyzing RF/MW energy systems struggle to differentiate the contributions of individual channels in multi-channel systems without causing significant disturbances or requiring expensive laboratory setups.
Innovation Solution
A method using dual-tone signals, comprising a large power signal and low-level test signals phase-modulated with specific frequencies, allows for non-invasive measurement of individual channel contributions by employing IQ modulation and demodulation techniques to extract amplitude and phase information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional scalar detection methods are used to measure RF feedback signals, then the measurement system is simple, but it is impossible to distinguish between concurrent signals from different channels
Solution Approach 1:
The patent segments the RF signal measurement problem by assigning unique modulation frequencies to each channel's test signal. This allows the total measured signal to be decomposed into individual channel contributions through frequency-based separation, enabling precise differentiation without requiring complex spatial or temporal segmentation of the measurement system.
Solution Approach 2:
The patent introduces low-level test signals modulated at specific frequencies as intermediaries to facilitate channel differentiation. These test signals are injected into each channel and serve as markers that allow the measurement system to identify and separate contributions from different channels through their unique modulation signatures, without directly modifying the main RF energy signals.
2Adaptability or versatility
If multi-channel RF energy systems combine coherent signals in the applicator, then flexibility for controlling EM field strength and distribution is maximized, but it becomes difficult to distinguish signal contributions from individual channels
Solution Approach 1:
The patent employs periodic modulation of test signals at distinct frequencies for each channel. This periodic action embeds channel-specific temporal signatures into the signals, allowing the measurement system to track and differentiate individual channel contributions even when the channels operate coherently and their EM fields combine in the applicator region.
Solution Approach 2:
The patent changes the modulation frequency parameter of test signals to differentiate channel contributions. By assigning unique modulation frequencies to each channel's test signal, the system maintains the ability to identify individual channel effects despite the coherent combination of EM fields in the applicator, thus preserving channel information while enabling flexible EM field control.
3Measurement precision
If small-signal tones are added to channels for measurement purposes, then channel contributions can be differentiated, but the system operation may be disturbed
Solution Approach 1:
The patent applies partial action by using low-level test signals that are sufficient for measurement purposes but insufficient to significantly disturb the main RF energy delivery. The test signal power is deliberately kept low (e.g., 10-20 dB below the main signal level) to minimize their impact on system operation while still enabling accurate channel contribution differentiation through their unique modulation frequencies.
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
Enables continuous, non-invasive monitoring and control of RF/MW energy systems, enhancing process efficiency and reducing disruptions by accurately measuring channel contributions without altering operational conditions.
Implementation Method 1
The later ones are phase or frequency modulated with signals, either harmonic ones or signals with different waveforms), which are unique and channel-specific.
Implementation Method 2
A method using dual-tone signals, comprising a large power signal and low-level test signals phase-modulated with specific frequencies, allows for non-invasive measurement of individual channel contributions by employing IQ modulation and demodulation techniques to extract amplitude and phase information.
Data Source
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AI summary
The present disclosure describes methods for measuring and analyzing the complex parameters of multitude of RF/MW signals, occurring in various points of the energy system. The application also describes embodiments of RF and mixed-signal hardware, implementing the invented methods. The methods deploy and process multi-tone signals in the channels of the RF/ MW energy system. The multi-tone signals consist of a high power signal, and one or multiple small-signal tones. The later ones are phase or frequency modulated with signals, either harmonic ones or signals with different waveforms), which are unique and channel-specific. The RF signals, sampled in different points of the system, could comprise the contributions of a multitude of channels. The contributions of the individual channels are differentiated, based on the applied modulation frequencies, and further analyzed, using appropriate demodulation and parameter estimation techniques. The magnitudes of the applied small-signal tones are, at least, in an order of magnitude lower than the large power ones and have insignificant impact on system's operation. Therefore, the disclosed methods can be applied both during the characterization phase of the RF/ MW energy applications, and in its "real-life" operation.