Simulation: Solver > Setup Solver > Time Domain Solver > Excitation list
This dialog offers the possibility to define a specific selection of port modes for the time domain solverpic solver excitation. The selected modes can either be excited one after another or simultaneously considering different amplitudes, phase resp. time shifts and excitation signals. Keep in mind that no S-Parameter calculation is possible for a simultaneous simulation, but corresponding normalized DFT spectra will be plotted in these cases.
Excitation type:
With this dropdown list you can specify in which way the selected sources (in the excitation list below) are excited. You can choose between sequential and simultaneous processing. In case of sequential excitation, it is possible to calculate standard S-Parameter results with fixed amplitude and signal settings (Sequential (port S-parameter)), or to excite each port/source independently with arbitrary (user definable) amplitude and signal settings leading to so-called F-parameters (Sequential (user def.)).
Selecting the Simultaneous option, all ports/sources are excited simultaneously in accordance with the settings made in the excitation list below. This will also give so-called F-parameters as well as active S-parameters as 1D result curves.
Available excitations:
Here, all occurring Excitations (port modes as well as current distributions) are listed and can be chosen for excitation by activating the respective check button. These buttons are highlighted in green if the corresponding port mode has already been calculated successfully.
If a simultaneous excitation is activated, the specific settings for each excited port mode can be defined in this list. It is possible to enter different Amplitude values in combination with either different Time shift or alternatively, Phase shift values in respect to a defined reference frequency. All these settings are applied to arbitrary time Signals that can be selected from the previously-defined excitation signals. All these values are referring to a reference signal with amplitude one (1/sqrt(watt)) and zero phase shift for a waveguide port (see Reference and Normalizing for details). The corresponding excited Power average value is evaluated as amplitude^2 / 2 and shown as additional information in the tooltip.
Note: A positive value for the time shift means that the time signal is shifted to the left. in order to define a time delay one must set a negative time shift. The PIC solver only allows time shifts smaller or equal to zero.
You can definitely compare the MATLAB simulation result with CST simulation. Number of array element / cluster array element and array element / cluster array configuration must be same as you have used in MATLAB. Material property used in CST and MATLAB must be same along with other boundary condition like limit of radiation boundary also must be same. when number of element /cluster array element are same This imply number of excitation port in CST and MATLAB will also be same. now you might have chosen some distribution pattern for excitation from MATLAB library. First take out the excitation coefficient given in MATLAB It is a complex quantity. it means we need to take out complex data (excitation coefficient given in MATLAB) In next step in CST assign the port number in same sequence as given in the MATLAB. while giving the excitation in CST we can give respective amplitude and phase value as obtained from MATLAB. ( CST it is possible we can edit the complex excitation coefficient of individual port) . We feel if you fallow the steps as said above you must gate the same result from CST as you have obtain in MATALB. At last point if you have fallowed the steps particularly Merial property, boundary condition or port sequence and respective excitation coefficient and still result is not same then we need to optimist CST Grid (Mash).