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Recent content by snowland

  1. S

    A wonderful FDTD codes---openGEMS ( open source codes )

    opensource fdtd code Thanks i will try
  2. S

    about microstrip simulation questions using HFSS!

    I think a PML BC may be more effieient for Microstrip Simulation Problem
  3. S

    What's wrong with my current distribution in HFSS?

    how do you excite the structure? using a lumped port between the feed line?
  4. S

    how to define ports in CST/HFSS for this loop antenna?

    hi, JimLiu I still get confused with the definition of lumped port could you help me modify my CST modle ? i attatched the file below! thank you so much !
  5. S

    how to define ports in CST/HFSS for this loop antenna?

    i mean in my question can i define just one port?
  6. S

    How to draw a triangle brick in CST ?

    Triangle brick in CST I just use extrude command, draw a triangle then extrude to 3D
  7. S

    how to define ports in CST/HFSS for this loop antenna?

    Thanks JimLiu, but could you tell me the detail ? Added after 32 minutes: should i define two discret port at point 1 and point 2 ? or just define 1 discret port connect 1,2?
  8. S

    how to define ports in CST/HFSS for this loop antenna?

    I have tried useing a lumped port but i did't got the right answer,. I thinks you didnot get the point of my question ,so i post the whole circuits here , please pay attension to the connection between the antenna and the chip! please see my attachment below , thanks you guys anyway. :cry::D i...
  9. S

    how to define ports in CST/HFSS for this loop antenna?

    hi, all i have truble in define ports for simulation this loop antenna! the antenna is placed on a FR4 board (it is not a microstrip! but a conductor wire placed on a dielectric board), point 1,2 are the feeding point conneted to a difference signal source ,so how to define the ports?
  10. S

    what's differential antenna?

    I am a newer in the field of antenna design. who can tell me what's a differential antenna? and what's a single ended antenna? in which book i can find the priciple of these kind of antenna? thanks1
  11. S

    Question about (2D FDTD program with pml )

    pml 2d yes, the theory in sullivan's book is not quit right. the PML sullivan deduced is only applicable for 1D and in the edge part of the PML, at the corner where both sigx, sigy exit, the program is not right . you must using the original berenger's PML theory and deduce the correct formula
  12. S

    MATLAB codes for wavelet based FDTD using Haar wavelet...

    haar matlab this method is not so promising I think, it is cumbsom and not very easy to use
  13. S

    About Battle-Lemarie wavelet reg...

    lemarie wavelet matlab B-L wavelets is not a compact supported wavelet But it has application because it has exact formula in time domain ( a recurcive formula? i can't remember very clearly) you can search its property in matlab toolbox if you are trying to apply wavelets in EM i hope you...
  14. S

    How to apply boundary conditions & calculate S-parameter

    Re: How to apply boundary conditions & calculate S-param IN MRTD we use PEC because the basis wavelet function for expanding the fields is not locally supported. using PEC and image theory we can know the field components outside the boundary .

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