[分享]Time Domain Analysis Using TimeFEKO

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Time Domain Analysis Using TimeFEKO <`oCz Q1  
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图片:timefeko_thumbnail_small.jpg

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http://www.feko.info/feko-product-info/technical/special-module-and-feature-articles/timefeko (#fm (@T  
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Brief description on how TimeFEKO can be used to get time-domain information from FEKO. fcgDU *A%  
FEKO is based on a frequency domain formulation. Time-domain information can however be obtained by applying Fourier Transforms on broadband frequency-domain data. The specification of time-domain pulse shapes and the required frequency domain simulations is automated by the TimeFEKO module. J=f:\]@Oy  
Available Pulse Forms GI0x>Z+  

• Gaussian >reaIBT  
  
• Ramp Fw(b1d>E  
  
• Double exponential B2ek&<I7N  
  
• Triangle. v9j4|
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Example: p?J~'  
The time domain response of the mono-static scattered electric field (Ez) is to be determined for a Gaussian pulse illuminating a cube along the x-axis. f_Wkg)g  
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Surface currents at 250 MHz. zbF:R[)  
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图片:TIMEFEKO_model.gif

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feko能够设置高斯普？ ^ s4|  
那的确很爽，能不能设置锥面柱的激励呢？

引用第2楼ham119804于2008-11-09 23:19发表的 : Nfh(2gK+  
feko能够设置高斯普？ A )cb
 
那的确很爽，能不能设置锥面柱的激励呢？

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不是很清楚....锥面柱的激励 IYPLitT  
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但是這是在時域下才可以做.

*.tim input file 跟 Defining the pulse form = 4If7  
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25 The program TIMEFEKO a'Z"Yz^Eo  
25.1 Description _?ym,@}#  
With the program TIMEFEKO electromagnetic scattering problems can be solved in the 8HzEH-J   
time domain. It is based on the program FEKO (that does the relevant calculations in the L2$%h1  
frequency domain) and an FFT algorithm (that transforms the data to the time domain). 4ZIXG,@mZJ  
For the excitation a number of different pulses have been pre-defined and stored in the < 5ow81  
function library (see section 25.3.1). C9h8d
 
The program TIMEFEKO is constructed in such a way that all the data in the output i=ba=-"Mt  
file (*.out) from FEKO is transformed, i.e. in the input file the cards have to be specified "elh~K  
in the correct way to ensure that the correct data is transformed. Information on the tua+R_"  
correct card definitions is given in the following section. &e(de$}xt  
The program TIMEFEKO uses two input files,10 that have to be created by the user. xASjw?  
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25.3 The *.tim input file yVL~SH|  
In the file *.tim the pulse form, position and the point in time are assigned. This file a4
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consists of a number of sections which are optional at present. EQ28pAZ  
• Set the pulse form with characteristic value and the time shift. SG~R!kN}Q  
• Set the value of the highest frequency and the sampling points. y& )z\8  
• Set the normalisation (normalise time to the speed of light). 0ode&dB  
• Set whether the output is written to the output file. x~W&a*WNT  
• Set the time points. ;23F8M%wH  
In the *.tim file, empty or comment lines (starting with **) are allowed. The parameters Jd |hwvwFe  
need not be entered in any particular column, but they have to be in the correct order. mU
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The keywords used in the *.tim file exist in German and English (for example ANREGUNG B 5?(gb"  
and EXCITATION). Both versions of each keyword will be given in the discussion below. l6&R g-  
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25.3.1 Defining the pulse form 8wBns)wy@  
The assignment of the pulse form is necessary. Each pulse has a predefined T<OLf
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particular characteristic parameters. The parameters must be assigned absolute it.l;L_nW  
and not normalised values. The amplitude factor u0 is 1. It can be changed _]\mh,}  
Ax card (in the file *.pre) with the appropriate amplitude value. 6jn<YR E-  
Time shifting t0: indicates the time (in seconds) that the pulses are delayed 'D1@+FFU0  
in Figure 25-1). The time shift should be such that the excitation of the D526X0  
t = 0 is approximately 0. Since both the time and frequency domain data G/y< bPQ  
this is not strictly required, but it simplifies working with the results. /<})+=>6f  
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1. Gaussian pulse GAUSS / GAUSS (see Figure 25-2) f /jN$p  
Example: qG;WX n  
** Pulse form u$0>K,f  
GAUSS vF_?1|*|  
** t0 Exponent a W46sKD;\^W  
2.0E-08 3.0E+08 K= 69z  
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2. Triangular pulse DREIECK / TRIANGLE (see Figure 25-3) csC3Wm{v  
Example: *"#>Ov>  
** Pulse form .(sT?M`\J  
TRIANGLE = *sP, 6  
** t0 Impuls Duration T a^2?W
 
2.0E-08 1.0E-08 ,Zdc  

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3. Double exponential pulse DEXP / DEXP (see Figure 25-4) Ei#"r\q j_  
Example: y]Y)?])  
** Pulse form kxKBI{L  
DEXP eq"~by[Uq  
** t0 T tau1 tau2 p\(%bO
 
0.0 10.0E-09 5.0E-9 10.0E-9 dLAElTg  
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4. Ramp pulse RAMPE / RAMP (see Figure 25-5) &t4j px  
Example: mJT7e  
** Pulse form tDi<n}  
RAMP pd|c7D!6U,  
** t0 Impuls Duration T tau1 tau2 '\9A78NV{;  
20.0E-09 15.0E-09 5.0E-09 10.0E-09 a9"Gg}h\  
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5. Double exponential impulse (second type) DBLEXP / DBLEXP (see Figure 25-6) w}'E]y2.  
Example: 
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** Impulse form 'Ct+0X:D  
DBLEXP H}:apRb  
** Time. t0 Parameter tau1 Parameter tau2 $N+azal+y  
20.0E-9 70.0E-9 5.0E-9

开始还认为是时域积分方程求解，原来傅氏变换来的

如果能把fdtd的功能加入进来 SX$v&L<  
估计用的人会更多

引用第5楼cem-uestc于2008-11-10 16:28发表的 : 03Pa; n  
开始还认为是时域积分方程求解，原来傅氏变换来的

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感謝 cem-uestc 的關注... 9tvLj5~  
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目前是 傅氏变换来.... 沒錯.... 頻域的東西就是如此.... 但是至少讓使用者可以轉到時域下去觀看他想看的問題. X YO09#>&  
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目前還沒 FDTD Code 加入.這是明確的....以後也許會有...

這是明確的....以後也許會有... V\axOz!  
webhugo 语法有问题  哈哈

引用第8楼ham119804于2008-11-11 09:59发表的 : <[xxCW(2  
這是明確的....以後也許會有... ssW+'GD  
webhugo 语法有问题  哈哈 [表情]

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抱歉..也就是說 ....  目前僅有 MOM, FEM, UTD, PO, GO, MLFMM, GA ... <\x/Y$jm0n  
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但是沒有 FDTD Code..... 9bjjo;A  
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目前想要看  Time Domain 僅能透過 Fourier Transforms ... (跟 網路分析儀一樣...都是需透過轉換) HZ=Dd4!  
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FEKO is based on a frequency domain formulation. Time-domain information can however be obtained by applying Fourier Transforms on broadband frequency-domain data.