Hi,
In the plasmonic wire grating problem of RF module, for calculating the diffraction orders, a logic expression ( imag(emw.beta_3)==0) ) term is multiplied to the S parameter. According to the pdf manual, this is done to set the S parameter to zero when the wave is evanescent and to multiply with one
when it is propagating (since the diffraction orders are not propagating for all angles). Now I have a couple of questions.
(i) why use only the strings like 'imag' , 'beta' and not anything else ....... I mean are these the default settings in comsol to mean for a logical expression just like c_const to mean for speed of light?
(ii) If so, can you explain me in little detail or can you provide me some source where can I find the details regarding how to use logic expressions in comsol?
(iii) Do I have to multiply this logical expression every time when I want to calculate diffraction orders... or are there some specific rules?
In the plasmonic wire grating problem of RF module, for calculating the diffraction orders, a logic expression ( imag(emw.beta_3)==0) ) term is multiplied to the S parameter. According to the pdf manual, this is done to set the S parameter to zero when the wave is evanescent and to multiply with one
when it is propagating (since the diffraction orders are not propagating for all angles). Now I have a couple of questions.
(i) why use only the strings like 'imag' , 'beta' and not anything else ....... I mean are these the default settings in comsol to mean for a logical expression just like c_const to mean for speed of light?
(ii) If so, can you explain me in little detail or can you provide me some source where can I find the details regarding how to use logic expressions in comsol?
(iii) Do I have to multiply this logical expression every time when I want to calculate diffraction orders... or are there some specific rules?
