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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 

riiily

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About riiily

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  1. Is it possible to use the ray-launching geometric optics method with lossy materials? We are trying to model RF propagation in an empty airplane shell (consisting only of faces) but receive the following error when we change the shell material from PEC to copper with a thickness of 1 mm: ERROR 33858: Metallic triangles for ray-launching GO found with unsupported losses. Is there any way to work around this error (in FEKO Suite 7.0)? I cannot post the plane model, but the shell can be thought of as an arbitrary closed surface inside of which there is a dipole antenna source. We would like to make the metallic shell have a thickness so to eliminate fields being generated external to the airplane with PEC as the shell material.
  2. Is it possible to use the ray-launching geometric optics method with lossy materials? We are trying to model RF propagation in an empty airplane shell (consisting only of faces) but receive the following error when we change the shell material from PEC to copper with a thickness of 1 mm: ERROR 33858: Metallic triangles for ray-launching GO found with unsupported losses. Is there any way to work around this error (in FEKO Suite 7.0)? I cannot post the plane model, but the shell can be thought of as an arbitrary closed surface inside of which there is a dipole antenna source. We would like to make the metallic shell have a thickness so to eliminate fields being generated external to the airplane with PEC as the shell material.
  3. Thanks JIF, I am able to set my dielectric faces to copper. I meant to say that I was unable to set them to say, ePTFE or TEFZEL, the dielectric media I set the regions to be whereas I am only able to assign metallic media to faces of objects and not to the regions of objects. So the rules are, metallic objects are modeled with free space as the region and the desired metallic substance of the object as the face media and dielectric objects are modeled with the dielectric media assigned to the region and a "dielectric boundary" as the face media if the dielectric shares the face with another dielectric region or free space and as a metallic media if the dielectric shares the face with a metallic object. Will these rules hold true generally?
  4. I am attempting to model a short section of leaky coax with a single slit in the center of the outer conductor with FEKO Suite 7.0. The model is attached. We are trying to evaluate the S21 value between two waveguide ports on the ends of the cable segment but the resulting S21 value is essentially zero (about -115 dB), which I believe is incorrect. When I replace the lossless user-defined dielectric medium of "ePTFE" with free space in the dielectric of the cable, the S21 value becomes more realistic (about 0.995). I believe there is some mistake in my modeling of the dielectric between the inner and outer conductors. What restrictions are there on modeling dielectric materials, specifically regarding the assignment of dielectric materials to regions and faces? For instance, in modeling metallic objects only the faces are assigned the desired metallic media of the modeled objects while the regions are set to free space; I do not seem to be able to set the faces of the dielectric to the desired dielectric media (while I can set the "Jacket" and "Dielectric" regions to the desired dielectric material) and assume the same rule does not apply to the modeling of dielectrics. What are the "Default", "Dielectric Boundary", and PEC face media specifications used for in modeling dielectrics? CopperLFA280SegmentChaoParameters.zip
  5. Why can I not assign all the media I have added to my Media Library to the regions and faces of the objects in my FEKO models? What are the rules for assigning media to regions and faces of models? I was told in an email from the FEKO support team that a metal solid is modeled in FEKO not by setting the region of the object to a metallic medium (which is not allowed) but by making the region medium of the object free space, by making the medium of the object "surfaces" (by which I assume was meant "faces") the needed metallic medium, and by making the thickness of those "surfaces" greater than skin depth. I have tried this but the metallic medium I am using, copper, does not appear on all of the model faces I need to model as copper. I am using FEKO 7.0.
  6. How can a union in CADFEKO be broken back into its constituent components without duplicating the components and then deleting the old union? This workaround works but is annoying. Also is there a way to selectively hide components of a union without breaking up the union? I am using FEKO 7.0.