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MOHAMED HAMDALLA

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Everything posted by MOHAMED HAMDALLA

  1. hi all, I am trying to do some coupling analysis for simple wire loaded with diode. I know that FEKO 2019 can handle spice models however i am facing a problem when i am using my simple diode model. Can you please help me to fix this issue. I have attached the FEKO file and two different spice files for a diode. Thanks 1.5KE39A.cir ideal.cir nonlinear.cfx
  2. Thank you very much mvogel. that file is really helpful. i will really appreciate if you can share with us a good reference paper that uses the similar values of the carbon fiber composite/Plexiglass you have attached. in other words, DO you think the attached values are practical values? Thanks
  3. Dear all, I just get to know that FEKO has a great capability of simulating anisotropic multi-layer carbon-fiber-reinforced composite materials from the attached file. However, I couldn't find the .CFX file of such simulations in the example guide, I am using FEKO 2019 and have all the older versions. Can anyone share the .CFX file of the case reported in the attached PDF file? It will be a great help for everyone to have this file as a reference. If its not possible to share this file, Can you please help me to understand how to assign anisotropic multi-layer carbon-fiber-reinforced composite material such as the case in the attached PDF file. Thanks EM Environmental_effects_on_Aircraft_with_CM_web.pdf
  4. Hi, I am trying to calculate the coupling to a wire above a dielectric cube for different wire orientation. So the structure is a fixed cube and a wire with variable orientation. Therefore i am using parametric sweep because i thought this may save the computational time. I know that the impedance matrix of the cube it self and the wire by it self should not change but only the coupling matrix. but as the parametric is sequential process it takes longer time than having multiple FEKO files ruining in parallel. Can anyone please help me to find out away to save the matrices of the individual parts in my structure to make the simulation faster or if any one has any idea to make it faster for the same parts but just different orientations. Hint: Domain Green's Function Method (DGFM) option is checked. Thanks
  5. Hi, what is the optimum mesh size to mesh a dielectric structure to make sure that it has been meshed enough for CMA? is lambda/20 is enough? "where lambda = c/highest frequency" Is there any way to confirm the CMA results for (dielectrics+conductng) structures? because as far as I know, no other software handle CMA for only dielectrics. for example, CST approximates the effect of the dielectric bodies on the conducting parts because the software cannot handle only dielectric objects. Thanks
  6. Thank you for your help. Sorry, It is in GHz.
  7. @Torben Voigt Thanks a lot. However, do you have any explanation for the disagreement between the two ways? Also is it a good way to simulate the experiment mentioned previously or there I another way to get s21 results rather than the voltage in this case. I am mentioning this because CST-Cable Studio shows completely different values and they are also using MTL and the values are quite similar to the measured values. Thanks
  8. Hi all, I am trying to simulate crosstalk between wires. I have used both the cable wires and normal wires with ports( both attached). I am not sure why i am not getting any crosstalk (voltage at wire 2 ends) for the cable setup. While i am getting some voltage on the other setup. However, the voltage I am getting from setup 2 doesn't match with CST results (voltage average is -20 dB). I am not sure which setup is more accurate to model the crosstalk between two wires (wire 1 connected from one end to VNA and the other end connected to SMA load resistor, Wire 2 both ends terminated by SMA resistors. ). Thanks crosstalk.cfx crosstalk2.cfx
  9. Thank you JIF for your great help. "I don't Know Lua scripting that's why I am using EDITFEKO". I believe if you have documentation for EDITFEKO it will be great for everyone trying to use it. one last question: how can I define the port of that labeled wire? that is I want to define a wire port at the middle of the wire. Thanks
  10. Hi all, I am trying to simulate two wires with loads. I am uploading each wire points from a .txt file. When I am trying to run the file it shows an error that I didn't assign a wire segment ports for the loads. However, they are defined in lines [52-56]. I have attached my editfeko file and wire points files to check if you can help me with this problem. Thanks Done.pre wire1.txt wire2.txt
  11. Hi all I am trying to simulate an unterminated twisted pair using CMA. every time it shows me an error. "Characteristic mode analysis cannot be used when the number of MoM basis functions is zero".This is also the same case when I terminated the cable with resistance. If I use the MOM in the harness properties it gives me another error "The combined MoM/MTL solution method may only be applied to shielded or single conductor cables". Is there a way to apply the CMA analysis on the unshielded (terminated/unterminated) twisted pair? Thanks UTP-cat6.cfx
  12. Hi all, If I loop over multiple field incident angles in FEKO and calculate Modal excitation coefficient, The calculated curve will be the results of which angle? I have attached my file to be clear if the question is confusing. Thanks straight.cfx
  13. I am so sorry. I couldn't understand how to do it. can you please refer a documentation so that I can follow step by step.
  14. Thanks a lot, JIF. Can you please tell me how can I request this file.
  15. Hi all, for the following matrix equation: I know how to extract the impedance matrix using the .mat file. However, I need to know how to extract the right-hand side of the MOM matrix i.e. VE and VH. [the external source information] Thanks.
  16. Thanks. So if I am trying to terminate the wire with impedance to ground, should I use the ground plane and connect my wire through the resistance to the ground? Is this configuration ok?
  17. Thank you very much for replay. My concern now is, if I add load at the end of the wire does it mean that the wire is terminated or no?. In other words, the load at the end of the wire is grounded or it is just floating?
  18. Hi, How can I add capacitive loads at both ends of my curved wire configuration? Attached the file. Thanks circle.cfx
  19. Thank you very much. So, if I disabled the tracking I will still get the actual 6 modes or it will give me whatever 6 significance modes at my starting frequency.
  20. Thanks a lot for replying. My concern is the following: in the attached figure, file.out will not arrange the modes according to their numbers all the time. At Some frequencies, the order will be changed to be mode 2 mode 3 mode 1 and at another frequency, it will be mode 3 mode 1 mode 2. Also, when I request 2 modes only I got 4 modes sometimes and if I request 6 modes it will give me more than 100 in some cases. I know that's because of the tracking algorithm " which is great and thanks a lot for your efforts" but till now there is no way to solve this issue? Thanks
  21. Hi all, is there any way to sort the modes for characteristic mode analysis in PostFeko. That is mode 1 is the actual mode 1 and mode 2 is the actual mode 2 and so on. Because sometimes I cheek the modal significance to find some of them is a point of two points. Thanks
  22. Hi JIF, What I want to do is to select a different frequency for each plane wave for the attached file. I can only select one frequency which will be automatically added to all the plane waves. Thanks multiplanewaves.cfx
  23. First, thanks a lot for your continuous great help. I need to excite my structure by two plane waves simultaneously each of different frequency . is there any way to do this? hint: I don't want to use superposition theory. Thanks.
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