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Found 3 results

  1. Hi, Everyone! I am new to Feko and Antenna Design in general. I am trying to model a simple turnstile antenna for a 1-Unit CubeSat, which then I am going to build using tape-measure (as conductors of turnstile antenna) and a PCB in the middle for feed circuit. here is a link where you can learn more about CubeSats (if needed): https://www.isispace.nl/cubesats/ When I model the antenna in Feko, there's always at least one dielectric region that has negative power loss in *.out file. For example, when I model the antenna without metallic body of CubeSat, image 1 shows the negative power loss in *.out file and image 2 shows the far field pattern. When I add the metallic body, images 3 and 4 show the results. I have also attached my CAD files. Can you tell me why this negative power loss happens and how can I fix it? And also, what other ways can I use to validate my results? Since, radiation pattern in image 4 doesn't seem correct to me Thank you very much, Yasaman Parhizkar full_turnstile_fixed.cfx full_turnstile_fixed_metal3.cfx
  2. Dear sirs, I have some doubts regarding the iron losses model. We are simulating a simple ring core transformer with a material loaded from the library and defined by its k1,k2,k3, alpha1, alpha2, alpha3 parameters. The results from the simulations are quite acceptable. In order to draw a graphic with the power losses versus the maximum induction, I have used the Bertotti modified model equation using the same parameters used by the program. Surprisingly for me, the values obtained with equation are very far from those obtained as a result of the simulation. How can this be possible? What could be the reason for it? Thanks for your help
  3. I'm currently modeling a segment of leaky coax using MoM. The segment has a waveguide source on one end and is terminated with a 50 Ohm structure on the other. I keep receiving the following warning: "WARNING 3397: The power loss is larger than the active power". The warning makes me question the validity of the results (which are not exactly what I expected numerically). In the past I have found this warning has occurred with this model with lossless dielectrics and has been fixed by making the loss tangent of the dielectrics a small nonzero number. In this case however, I am using copper as the only lossy medium (as a friend did in a simulation of the same structure with COMSOL). Why are the losses exceeding the power inputs and does this incorrect result have significant physical meaning? Obviously the model has nonphysical results, but does that invalidate the results entirely? What are the unrealistic features of the model causing this incorrect calculation? Can this situation be resolved without making the dielectrics lossy (to maintain equivalence with my friend's COMSOL model)? Even with lossless dielectrics, how can the solution of the wave equations result in the power loss being noticeably (~1%) greater than the active power? CopperLFA280Segment.zip
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