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Recent content by cherne-he

  1. C

    the electromagnetic wave the radar transmitted

    hi, everyone which mode is the electromagnetic wave the radar transmitted, TE, TM or TEM mode? thank you in advance!
  2. C

    Calculating S11 of a multi-layer EM absorber using COMSOL

    Hi, everyone I'm a newcomer to COMSOL. I want to simulate S11 of a multi-layer EM absorber. My issues are below: 1. The top face is set port, and the bottom face is set Perfect Electric Boundary to reflect EM wave totally. Someone said the face that is set port should define Perfect Electric...
  3. C

    How to define boundary in interface of different layers in HFSS?

    Hi, everyone I want to simulate a electromagnetic absorber which is a multilayer structure in HFSS. What boundary should I define in interface of different layers? Thank you in advance!
  4. C

    calculate the reflection coefficient using MATLAB program

    Hi, evryone I wrote a program using MATLAB to calculate the reflection coefficient, but the value of the RC is 3.8282. so the program is incorrect. Could you check it for me? Thank you in advance! The program is below. clc clear epsilon=[10.98+6.96j 14.36+11.15j 7.89+3.63j 2.91+0.113j]...
  5. C

    How to assign TE and TM wave in HFSS?

    Hi, Thank you very much for your reply! Assign the integration line. Is it mean a electric field is perpendicular to the direction of propagation and a magnetic field along the direction? Then, how to assign TM wave? Thank you! Cherne he
  6. C

    How to assign TE and TM wave in HFSS?

    Hi everyone, I assign Wave Port for Driven modal. But I want the plane electromagnetic wave to be TE or TM wave. What should I do? Any suggestions? Thank you in advance! Cherne he
  7. C

    scattering parameters and electromagnetic reflection coefficient

    Hi, Thank you for your warm reply! My model is simple. I just simulate the normal incidence angle. Do you have relevant experience to simulate S11. Could you spare time to help me to check it. My email address is chernehe@gmail.com. Thank you in advance! Cherne he
  8. C

    Calculating reflection coefficient of a multi-layer structure using HFSS

    Thank you for your reply! Could you write it more clearly? Thank you!
  9. C

    Calculating reflection coefficient of a multi-layer structure using HFSS

    Hi everyone, I want to simulate a model described in a paper. But my simulation result isn’t the same with that in the paper. I’m not sure how to enter the complex relative permittivity. The real part is 9.52, and the imaginary is 5.27. Is the setup right in figure1 attached? The air box include...
  10. C

    scattering parameters and electromagnetic reflection coefficient

    Hi Volker, Thank you very much for your warm reply. You are a kind-hearted man. You are right. I refer to my thread posted 10 days ago. I want to test my electromagnetic absorber, and the magnitude of electromagnetic reflection coefficient represents its capability of electromagnetic wave...
  11. C

    scattering parameters and electromagnetic reflection coefficient

    Hi everyone, I want to stimulate the reflection coefficient of the electromagnetic absorber. There are scattering parameters in HFSS or CST. Does the S11 represent electromagnetic coefficient? Thank you! Best regards,
  12. C

    Using HFSS to simulate EM reflection coefficient, which method is correct?

    Hi ehsan_faal, I created a sheet, the size of which is 10 mm*10 mm as is smaller than former's 200 mm*200 mm, on the face of air box. Then assign the port on it. The face is coplanar to multi-layer's bottom face. The E field is attached. But i don't know how to modify the size of port according...
  13. C

    Using HFSS to simulate EM reflection coefficient, which method is correct?

    Hi ehsan_faal, I want to extract S11, so I must assign wave port. The material of multi-layer structure is dielectric. Is it correct that I assign wave port for the surface of air box? If it is right, should I assign wave port for the surface of air box, or create a sheet on the surface of air...
  14. C

    Using HFSS to simulate EM reflection coefficient, which method is correct?

    Hi Vahidqc, Thank you for your warm reply. Your suggestions are very useful. Is the wave port assigned for side of air box? Regards, Cherne-he
  15. C

    Using HFSS to simulate EM reflection coefficient, which method is correct?

    Hi everyone, I want to use HFSS to simulate the electromagnetic reflection coefficient of a multi-layer structure (namely electromagnetic absorber), the thickness of each layer of which is about 5 mm, made by dielectric material. The electromagnetic wave, the frequency of which is about 5 GHz...
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