Publisher： Taylor & Francis Ltd
ISSN： 1569-3937
Source： Journal of Electromagnetic Waves and Applications, Vol.15, Iss.7, 2001-01, pp. : 865-883
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
A frequency extrapolation technique is proposed to obtain the broad band radiation patterns of antenna-platform radiation problems. A frequency-dependent time-of-arrival model is applied to the induced current computed at low frequencies. The model parameters are estimated by applying the ESPRIT superresolution algorithm to the computed data. A pre-multiplication scheme in conjunction with the complex time-of- arrival estimation from ESPRIT is used to determine the additional frequency-dependent factors in the model. The current at high frequencies is then extrapolated based on the model and the radiated field is computed using the extrapolated current. The algorithm is applied to several 2D and 3D antenna-platform radiation problems. The extrapolated radiation patterns are found to be in good agreement with those generated by brute force computation. Since the current required for the extrapolation is only computed at lower frequencies, large savings in computation time and memory can be achieved.
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