| 摘要 |
The present application relates to an apparatus (20) and method for estimating a characteristic, such as resonant frequency, bandwidth or insertion loss, of a microwave resonant device (12), that is to say a device that resonates in response to an excitation signal in the microwave frequency range. A broadband excitation signal is applied to the microwave resonant device (12) and a response signal output by the microwave resonant device (12) in response to the excitation signal is received. The response signal is compared to the output of an adaptive filter (14) to which the excitation signal is input, and a filter weight update algorithm calculates revised filter weights to match an output of the adaptive filter (14) to the response signal output by the microwave resonant device (12). The filter weights so calculated are used to calculate an estimate of the spectral response of the microwave resonant device (12), and this spectral response estimate is used to calculate an estimate of the desired characteristic. |
