Autoregressive (AR) Spectral Estimation Technique for Faster TLM Analysis of Microwave Structures

C. Eswarappa and W. J. R. Hoefer

IEEE MTT-S International Microwave Symposium, pp 701-704, San Diego Convention Center, San Diego, California USA, May 23-27 1994.


A spectral estimation technique based on the Autoregressive (AR) method has been successfully implemented to increase the efficiency of the TLM method. It can be used to compute the full time-domain response from a relatively short segment of the early TLM response. It was found that the Least-Square technique of estimating the AR parameters requires a shorter time record than solving the Yule-Walker equations through the Levinson-Durbin algorithm. Application to a three-section waveguide bandpass filter at 35 GHz shows that this technique gives very accurate scattering parameters with a computational savings of up to five times.

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