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  1. A

    a question about Maxwell equation

    thanks lagrange, i just realized my math flaw when i am taking a shower:) hail to the maxwell equations
  2. A

    Gain differences between HFSS simulation and test results

    how do you manage to simulate a transistor device (LNA) in HFSS?
  3. A

    a question about Maxwell equation

    But i think the ambiguity here is between (a) & (b) (a) Physically, change of coordinate system should NOT change how fast the charge accumulates in a point. (b) Mathematically, change of coordinate system does seem to change how fast the charge accumulates in a point.
  4. A

    a question about Maxwell equation

    please refer to the attached picture. thanks:)
  5. A

    How to calculate/estimate the resonate frequency in Microstrip Resonator?

    Hi, If i have a microstrip line with dimension W and L, (L>W). The substrate is of height H and dielectric constatnt Er ( Hence an effective dielectric constant Eeff can be calculated). This segment of microstrip line should resonate at certain frequency right? So I have 2 questions: (1) How...
  6. A

    HFSS interpolating sweep problem

    i saw 'interpolating' sweep missed resonate frequency for several times. but i never saw it reported a false resonate freq.
  7. A

    compact phase shifter at 1MHz

    Hello, I am trying to build a compact phase shifter at low frequency, say 1MHz, with a phase shift of ±140~150 degree. The phase shift does not have to be tunable. Could you please show me some directions on it? Thanks a lot! p.s. i have done some literature review and found out that phase...
  8. A

    HFSS to ADS design Export: Help Plz

    to export gerber file from an HFSS file decribing a multi-layered structure (say 6 metal layers) you need to define 6 offset coordinates, whose origin lie on eatch of the 6 layers. Then you export them one by one to gerber format.
  9. A

    Measurement using UTF (Universal Test Fixture)

    universal test fixture Hi there, I have fabricated stripline bandpass filter on LTCC. A pair of extra vias and pads are added to elevate the buried striline port up to the surface so that measurement can be done by UTF. The performance of the filter looks fine under HFSS simulation. However...
  10. A

    [Matrix Manipulation] Help plz!

    A,B,C,D (hence P,Q) and X are all unknown...
  11. A

    [Matrix Manipulation] Help plz!

    Hi Louis the 'X' is in the equation \[P\times X\times Q=T2\]
  12. A

    [Matrix Manipulation] Help plz!

    Assuming \[P=\left[\begin{array}{cc}A & B \\C & D\end{array}\right]\] and \[Q=\left[\begin{array}{cc}D & B \\C & A\end{array}\right]\] where A, B, C, D are unknown. It's also known that \[P\times M\times Q=T1\] \[P\times X\times Q=T2\] where X is unknown M, T1 and T2 are known. All the...
  13. A

    How to synthesize lumped model from s-param of inductor?

    this is a huge area of research... which often leads to a phd work so you would not find any easy to use software. you may like to search inductor modelling on IEEE
  14. A

    PML thickness in HFSS

    did you mean the 'largest frequency'?
  15. A

    [Modelling] Good capacitor model?

    hi i am trying to find a better Metal-Insulator-Metal capacitor model. This is what I have right now: C=Er*E0*(a+f)*(b+f)/h where a, b are the width and length of the two rectangular plates; h is this distance between the two plates, (or thickness of the insulator) and f represents effective...
  16. A

    Loss tangent DECREASES with frequency???

    Thanks for the reply. It helps me a lot! I have one more question: for lossless medium, σ=inf, then what can we say about the current? Does it flow everywhere in the medium or on the surface or what? Thanks!
  17. A

    Loss tangent DECREASES with frequency???

    /(Thanks for the reply! I have another doubt. When σ increases, that means the medium is more "conductive" right? That means "less lossy". Then how come loss in the medium will increase according to equation tanδ=σ/(ωε)
  18. A

    [Help]Solutions for Cam Nguyen's book

    Could anyone please upload the solution manual to "Analysis Methods for RF,Microwave, and Millimeter-Wave Planar Transmission Line Structures" by Cam Nguyen Thank you very much!
  19. A

    Loss tangent DECREASES with frequency???

    hi as loss tangent can be expressed as tanδ=σ/(ωε) so it decreases with frequency. but i also heard that loss tangent will increase over frequency. e.g. page 16 of Cam Nguyen's "Analysis Methods for RF, microwave, and millimetr-wave planar transmission line structures" so am I missing...
  20. A

    how can i set the lumped port for ltcc capacitor?

    I guess your C equation is incorrect. please try: C=im(Y11)/(2*pi*freq)

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