WHY THE DFT IS FASTER THAN THE FFT FOR FDTD TIME-TO-FREQUENCY DOMAIN CONVERSIONS

被引：35

作者：

FURSE, CM

GANDHI, OP

机构：

[1] Department of Electrical Engineering, University of Utah, Salt Lake City

来源：

IEEE MICROWAVE AND GUIDED WAVE LETTERS | 1995年 / 5卷 / 10期

关键词：

Manuscript received March 21; 1995. This work was supported by the National Institute of Environmental Health Sciences; Research Triangle Park; NC; under grant ES-03329. Computer time was provided by a grant from the Utah Supercomputing Institute. The authors are with the Department of Electrical Engineering; University of Utah; Salt Lake City; UT 84112 USA. IEEE Log Number 94 14 124;

D O I：

10.1109/75.465048

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Although it is a time-domain method, the finite-difference time-domain (FDTD) method has been used extensively for calculating frequency domain parameters such as specific absorption rate, radar cross-section, and S-parameters. When a broad frequency band is of interest, using a broad-band pulsed excitation can provide this frequency response with a single FDTD simulation. The frequency domain data can be calculated from the time domain data using either a discrete Fourier transform (DFT) or a fast Fourier transform (FFT). This letter examines both methods and analyzes why the DFT is generally more efficient and easier to use than the FFT for FDTD time-to-frequency domain conversions.

引用

页码：326 / 328

页数：3

共 12 条

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