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Recent content by vacikel

  1. V

    Microstrip large to have 50 ohm

    characteristic impedance of a transmission line is the ratio of voltage wave to current wave propagating in the same direction. And if there is no reflection at the end of the transmission line ( a matched load or a infinite TL) your signal will always see the characteristic impedance of the...
  2. V

    What is the big difference in using DCT and DFT?

    dft vs dct when using dft you have to keep complex numbers also you have to perform complex computation however by using dct you all deal with real numbers you perform your computation with real numbers and you keep real coefficients. So, you gain memory locations and your computational cost...
  3. V

    HFSS "mesh size" lumped

    Re: PCB design at RF as I know you must use surface mount lumped elements if you need to use any.
  4. V

    problem with Orcard Capture CIS and PSPICE

    can you upload your file or send an e-mail to me I may check it
  5. V

    WHICH IS FAST? BJT or MOS

    bjts, diodes, mos if you drive BJT circuit with current, I mean the state of BJTs will be determined by current instead of voltage, and if you avaoid BJT to go in saturation deeply,this can be done by using schotky clamping diodes, BJT circuits are faster.
  6. V

    JPEG: pixel variation Vs Spatial frequency

    spatial frequency pixel I hope you asked this if you get the pixel size smaller you make the spatial frequency higher and if you make pixel size higher you make the spatial frequency lower we may formulate it like this pixel length = 1/(some constants*spatial frequency)
  7. V

    wat is the meaning of K=0 in root locus method

    K=0 means you are seeing the roots of open loop system you can check it with matlab plot a root locus with matlab and point the roots of open loop system with data curser you will see 'Gain=0'
  8. V

    MATLAB: Converting Character to Decimal ASCII Code

    ascii matlab try this >>'asd'-0 ans = 97 115 100 this might be helpful
  9. V

    how to read .D2 files in matlab

    I've already open it in notpad and its format is disorganized. also I found a way to get date thanks for your reply
  10. V

    how to read .D2 files in matlab

    matlab importdata variable filename I have datas taken from a spectrum analyzer they are in the form DATA.D2 and the question is how the files with D2 extantion read in matlab
  11. V

    How to see all results when solving an equation by changing variables in Matlab?

    Re: matlab help did you try to keep result in a vector ?
  12. V

    HFSS S11 with voltage source

    it can be usefull for some people; I found that you can not look S parameters with voltage source
  13. V

    Circuit Simulator software / freeware

    you can use 5spice it is easy to assign IC and transistor types
  14. V

    waveport problem in HFSS

    I totaly changed the geometry of waveport part now I see characteristic S11 of birdcage coil thanks
  15. V

    waveport problem in HFSS

    I made this waveport in HFSS but there are problems with it. It has a linear S11 which is totaly wrong. can anyone help me? I attached the project file :)
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