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1. (WO2018125137) SYSTÈME ET PROCÉDÉ D'ANALYSE D'UNE RÉPONSE EN FRÉQUENCE D'UN DISPOSITIF DE CUISSON ÉLECTROMAGNÉTIQUE
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What is claimed is:

1. A method for analyzing a frequency response of an electromagnetic cooking device comprising a resonant cavity comprising:

controlling a plurality of RF signals comprising a first RF signal and a second RF signal within an operating range of the cooking device at plurality of phase shifts between the first RF signal and the second RF signal;

measuring a plurality of efficiencies of at least one reflection signal in the resonant cavity in response to a plurality of RF feeds generated from the RF signals for the plurality of phase shifts; and

modeling the frequency response of the resonant cavity with a numeric model;

calculating a plurality of interpolation parameters for the numeric model based on the plurality of measured efficiencies of the RF feeds in response to the plurality of phase shifts;

estimating a frequency response of the cavity for the operating range of the cooking device based on the numeric model with the plurality of interpolation parameters.

2. The method according to claim 1, further comprising:

amplifying the RF signals and generating a plurality of RF feeds; and

emitting the RF feeds into the cavity.

3. The method according to claim 2, wherein the frequency response comprises a plurality of resonant modes corresponding to resonant frequencies of the cavity induced by the RF feeds.

4. The method according to any one of claims 2-3, further comprising:

mapping the frequency response of the resonant cavity induced by the RF feeds in response to at least three phase shifts within the operating range of the cooking device.

5. The method according to any one of claims 1-4, wherein the plurality of phase shifts between the first RF signal and the second RF signal comprise at least three phase shifts.

6. The method according to claim 5, wherein the measuring of the plurality of efficiencies comprises measuring at least three efficiencies corresponding to the at least three phase shifts.

7. The method according to any one of claims 1-6, wherein the efficiencies of the plurality of phase shifts are measured sequentially thereby identifying the plurality of efficiencies.

8. The method according to any one of claims 1-7, wherein the interpolation parameters correspond to coefficients of the numeric model.

9. The method according to any one of claims 1-8, further comprising:

identifying at least one resonant mode as localized maxima from the efficiency of the resonant cavity and calculated based on the numeric model with the plurality of interpolation parameters.

10. An electromagnetic cooking device comprising:

an enclosed cavity configured to receive a food load;

a plurality of amplifiers configured amplify a first RF signal and a second RF signal thereby supplying a plurality of RF feeds to the enclosed cavity;

at least one measurement device configured to measure a plurality of reflection signals from the RF feeds;

a controller in communication with the plurality of amplifiers and the

measurement device, the controller configured to:

control the first RF signal and the second RF signal within an operating range of the cooking device at plurality of phase shifts between the first RF signal and the second RF signal;

control the amplifiers to amplify the RF signals thereby generating the plurality of RF feeds;

measure a plurality of efficiencies of the reflection signals in the cavity induced by the RF feeds for the plurality of phase shifts; and

estimate efficiency results for the frequency response of the cavity comprising additional phase shifts estimated for the operating range of the cooking device, wherein the additional phase shifts are different from the plurality of phase shifts.

11. The device according to claim 10, wherein the controller is further configured to: identify at least one resonant mode as a localized maxima from the efficiency results.

12. The device according to any one of claims 10-11, wherein the controller estimates the efficiency results based on a numeric model comprising a plurality of interpolation parameters.

13. The device according to claim 12, wherein the controller is further configured to: calculate the interpolation parameters for the numeric model based on the plurality of efficiencies measured for the reflection signals.

14. The device according to any one of claims 12-13, wherein the interpolation parameters are updated by the controller for the cavity for a food load.

15. The device according to any one of claims 12-14, wherein the controller is further configured to:

update the interpolation parameters during a cooking process based on additional efficiencies of the reflection signals measured by the at least one

measurement device.

16. The device according to claim 15, wherein the updated interpolation parameters are configured to improve the estimate of the efficiency results by accounting for changes in the cavity and the food load during the cooking process.

17. An electromagnetic cooking device comprising:

an enclosed cavity configured to receive a food load;

a plurality of amplifiers configured amplify a first RF signal and a second RF signal thereby supplying a plurality of RF feeds to the enclosed cavity;

at least one measurement device configured to measure a plurality of reflection signals from the RF feeds;

a controller in communication with the plurality of amplifiers and the

measurement device, the controller configured to:

control the first RF signal and the second RF signal within an operating range of the cooking device at a plurality of phase shifts between the first RF signal and the second RF signal;

control the amplifiers to amplify the RF signals thereby generating a plurality of RF feeds;

measure a plurality of efficiencies of the reflection signals in the cavity induced by the RF feeds for the plurality of phase shifts;

model the frequency response of the cavity with a numeric model;

calculate a plurality of interpolation parameters for the numeric model based on the plurality of measured efficiencies; and

generate estimated efficiency results with the numeric model for a frequency response of the cavity, wherein the estimated efficiency results comprise additional phase shifts estimated for the operating range of the cooking device, wherein the additional phase shifts are different from the plurality of phase shifts.

18. The device according to claim 17, wherein the efficiencies of the plurality of phase shifts are measured sequentially thereby identifying the plurality of efficiencies.

19. The device according to any one of claims 17-18, wherein the plurality of phase shifts between the first RF signal and the second RF signal comprise at least three phase shifts.

20. The device according to any one of claims 17-19, wherein the controller is further configured to:

identify at least one resonant mode as localized maxima from the of the estimated efficiency results.