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Recent content by wlcsp

  1. W

    Ferrite e.g. PC95 material properties

    Hi, Has anybody ever used ferrite in their simulation (CST or HFSS) ? Perhaps you would like to share the material properties :grin: wlcsp
  2. W

    Planar antenna with vertical polarization ?????

    I want to have my pcb horizontally planar (xy-plane), while I want to have vertical polarization (z-axis).
  3. W

    Planar antenna with vertical polarization ?????

    Can anybody refer me to a planar antenna (on-pcb) that has vertical polarization? Thank you.
  4. W

    180 phase shift with half-wavelength transmission line

    Hi Tony, Thanks for the reply. How to calculate it?
  5. W

    180 phase shift with half-wavelength transmission line

    Dear all Half-wavelength transmission line gives an 180 degree phase shift. Suppose I want to model it with T-network consisting 2 equal inductors and 1 capacitor (grounded) in the middle. How can I define the L and C values, say for 850 MHz. Many thanks.
  6. W

    MRI resonant frequency

    Hi all, How can I detect the resonant frequency of an MRI in HFSS? In CST-MWS, I simply place a field probe (Hy) in the center of my MRI. The frequency where the field is at maximum would be my resonant frequency. How should I do it in HFSS? thanks
  7. W

    iPhone 4 antenna diversity

    Hi vfone, thanks for the note. What I found from the internet is that iPhone 4 has two frame antennas (for bluetooth/WiFi/GPS and UMTS/GSM) and one internal antenna. My questions are: 1. Is there really internal antenna? What type e.g. patch ? 2. How can I create one frame for multi-band? with...
  8. W

    iPhone 4 antenna diversity

    Dear experts, Does anyone know what kind of antenna diversity (spatial, pattern, polarization, transmit/receive) iPhone 4 implements? thanks, wlcsp
  9. W

    "Numerical Techniques in Electromagnetics" by Mr.

    Yes, I do.
  10. W

    Transition from Near to Far Field in CST

    Near to Far Field in CST Dear all, I simulating a horn antenna in CST. I'd like to see the transition from near field to far field. Does anybody know how to do this? many thanks, wlcsp
  11. W

    S-parameter- what sort of reference should I implement?

    s-parameter reference node close Dear all, I have a BGA package with solder bumps on top and solder balls on bottom, which belong to power, ground, and signal nets. However, I would like to treat all of them as signals since I want to connect the S-parameter block in the circuit schematic with...
  12. W

    Mesh cells filled with PEC material in CST-MWS

    Dear all, Often, some mesh cells are filled with PEC material. Is there any trick to avoid it other than increasing the mesh? many thanks, wlcsp
  13. W

    HFSS - multiple ports

    internal ports hfss I am not really sure I can give you any reasonable explanation. But the way the setup the two simulations are totally different. In setup #1 you used lumped port as differential excitation which leaves your ground plane floating, no common-mode field. This means your...
  14. W

    Z0 in HFSS different results - help needed

    Re: Z0 in HFSS Make sure you use the proper impedance definition for microstrip i.e. Zp. Please check it in the manual. when you use ABCD matrix, make sure you used the proper length.
  15. W

    P and N Substrate using HFSS

    No, you don't have the option to define the silicon substrate as p-type or n-type. what you can do is to simulate your substrate in device simulator e.g. MEDICI and plot the concentration, hence, the resistivity, and then emulate this in your HFSS.
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