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Recent content by Shehata

  1. S

    insertion loss and attenuation

    |S21| dB is the insertion loss but I would call it gain (power gain) for an active circuit/amplifier >0dB and will call it insertion loss if passive/lossy circuit <0dB For passive circuits/reciprocal S21 = S12.. This is not the case for active ones. For instance, amplifier magnify the signal...
  2. S

    design of antenna using hfss software

    Hi, There are hfss examples for antenna. The simplest way, i believe is to use hfss antenna design kit to create the model. After that, you can optimize the antenna for your application
  3. S

    Help! hfss err: Typically a lumped port contains 2 conductors ...

    The lumped port does not touch the ground. Try to extend it
  4. S

    Omnidirectional Antenna Optimization in HFSS

    Hi I would say minimize the difference between the MAX and the MIN of the gain in this plane. Thanks Shehata
  5. S

    design Substrate integrated wave guide slot antenna using CST microwave

    You can start with slots on metallic waveguide. Then add the VIAs later on.
  6. S

    Antenna_Conception_Problem

    do u want to send ur antenna schematic and i can simulate it
  7. S

    Problem in HFSS with meshing at different frequencies

    It beame only stable when meshing at 160GHz. I have a large discontinuity in my structure but I expected the adaptive meshing to be smart enough to get it. I think the way hfss does its convergence check is not efficient. It should check the actual field values instead of S parameters
  8. S

    Problem in HFSS with meshing at different frequencies

    Hi I am simulating a filter with HFSS 13 driven modal When I mesh at different frequency I have a very big difference in the response Attached is a picture for meshing at 77 and 75GHz Thanks
  9. S

    Simulation of CB-CPW on ADS momentum in the W band

    Thanks a lot! I want also to add that this type of simulation agrees with HFSS if you make sure that the modes are slot e.g. no parallel plate modes Attached is a snapshot for a simple CPW line. The figure shows the agreement between HFSS and momentum
  10. S

    Simulation of CB-CPW on ADS momentum in the W band

    I have found the best results can be done with slot line based simulations as advised in ADS examples
  11. S

    Simulation of CB-CPW on ADS momentum in the W band

    Hi I am trying to simulate CB-CPW on ADS momentum. I am a bit worried about the ground port definition in momentum. Any clue? Thanks
  12. S

    How to model a slot antenna in HFSS

    Re: slot antenna in hfss Hi I suggest you start with the waveguide alone (2 port problem) and verify the simulations with the theory. Then add the antenna. If you have any problem plz send the file
  13. S

    How to reduce the first sidelobe level of microstrip antenna array

    Hi I did not look in the file but decreasing SLL is usually achieved by tapering the amplitude of the array factors.
  14. S

    need to match this dipole array URGENTLY

    Hi You can sweep the phases offsets and find the value set that corresponds to the beam direction you want. It is a post processing sweep so you do not need to re-simulate, Cheers, Shehata
  15. S

    how to make an electromagnetic wave detector

    what is the freq.
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