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2D Hexagonal Periodic Array
Posted 9 avr. 2014, 05:13 UTC−4 Version 4.3a 1 Reply
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I am trying to built a model on 2D Hexagonal Periodic Array with periodicity in the xy-plane. For that I have defined a 3D hexagonal unit cell with the top and bottom hexagonal faces as the excitation and destination ports respectively. For the remaining 6 rectangular faces I define 3 (2 faces each) periodic conditions on the opposite faces. A plane wave is incident along the z direction( presently normal to the xy plane but later would like to change for different incident angles) with E polarized along the x-direction.
First of all is the unit cell definition along with the periodic condition application sides are correct?
Secondly how do I use Floquet Periodicity with correct Kf definitions? Will it be similar to plasmonic wire grating case where array periodicity and Floquet kf are parallel which is not in my case ?
A pdf showing the model geomerty along with the periodic Boundary conditions is attached.
I would be really grateful if you guys help me out.
Attachments:
Hello Johnson Singh
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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?