Specification of list of frequencies for time domain approximate sinc signal

Altair Forum User

Hi,

 

I wish to provide list of discrete points in Solution frequency in CADFEKO for the purpose of specifying time-domain sinc signal in POSTFEKO. 

1. When I specify Single frequency,  , I understand that solution is obtained for this frequency only. In POSTFEKO, ideally a time-signal can be constructed, such as cosine or sine, with exact frequency. Is it correct?
2. FEKO user manual mentions following about frequency specification: 

I wish to specify List of discrete points that construct a specific time-signal in POSTFEKO. The time signal is a sinc function. Can it be defined mathematically in POSTFEKO? Here I limited sinc to two side-lobes only.

Overall time duration of signal is 290 μs. How to decompose above signal to: 1. cos() signal for central lobe, and 2. two sin()/cos() functions for negative side-lobes in POSTFEKO? Can frequency of these individual functions be specified as List of discrete points?

 

Thanks,

FieldForcer

mvogel

In CADFEKO, where you set up the simulation, you should just specify a range of frequencies that is wide enough to represent the time-domain signal later. Don't worry yet about specific frequencies; only make sure you have a proper minimum frequency, maximum frequency and a large-enough number of frequencies to see a reasonable plot of the frequency-domain behavior.

In POSTFEKO, you can define the time-domain signal mathematically or import a text file with time-domain samples. All the calculations needed for the time-domain results will be done in POSTFEKO.