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Type: Posts; User: PlanarMetamaterials

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  1. Closed: Re: Diagonalization of Impedance Matrix

    I think it may be instructive to look at diagonalization of the matrix in the first place.

    If we have such a diagonalization, then: [Z]I = Iλ, with λ being the eigenvalues and I being the...
  2. Closed: Re: Regarding RF PCB layout design in my company product, some questions

    My guess would be [in the absence of specifics] that the antenna ground plane section plus inductor is acting as a half-wavelength (free-sapce) resonator, where most of the phase is being provided by...
  3. Closed: Re: Microstrip line and ground on same layer

    I believe what you're looking to do is match the characteristic impedance of the microstrip with that of the CPW-like mode of a conductor-backed CPW. You can find approximate solutions in works like...
  4. Closed: Re: Diagonalization of Impedance Matrix

    Diagonalization is only possible iff there exists a complete set of eigenvectors.

    Is [Z] a Hermitian matrix?

    See Horn and Johnson's Matrix Analysis.
  5. Closed: Re: Why does HFSS ask for me to click and draw every single time, also a few other is

    Hi Nhera,

    I'm not aware of any way around your posted issues. The objects are each created with a "history"; you can view/edit these in the middle pane when the project is selected.
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    Closed: Re: Capacitance from S parameters

    The above responses have not asked a simple question: the capacitance of what? Please provide a circuit model.
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    Closed: Re: S parameters in HFSS

    The S21 and S12 represent the power travelling from port 1 to port 2, and vice-versa. They are the same, since the device is reciprocal (the power sees the same effect travelling either way; the same...
  8. Closed: Re: Circular polarization using coupler

    Unfortunately, the issue is then your antenna, and not the excitation. Is it a circular patch?
  9. Closed: Re: Circular polarization using coupler

    Hi gayathrim,

    Yes, it is possible. Using either lumped ports or wave ports, you can set the sources excitation phase under "HFSS"->"Fields"->"Edit Sources...".

    Good luck!
  10. Closed: Re: Parallel Plate Capacitor using HFSS

    Hi G_V,

    The DC static fields inside the capacitor should be similar to those of the transverse cross-section of the PPW mode. A lumped/wave port should excite both, but these also are a 50 Ohm...
  11. Closed: Re: Parallel Plate Capacitor using HFSS

    Hi G_V,

    There might be some confusion here. How and why are you trying to excite the capacitor? Why would you want different modes inside of it?
  12. Closed: Re: Parallel Plate Capacitor using HFSS

    Welcome G_V,

    In order to excite a TEM guided-wave mode, the port needs to contact both plates; this is why in your case it must be in either y-z or x-y. A lumped port is used for internal...
  13. [SOLVED]Closed: Re: [DISCUSSION] Maximum ram usage for Sonnet/HFSS simulation

    The structure in that case consisted of a number of small 100 um features, but was cubic and approximately 20mm on each size.

    I still can't overemphasize what has been said: more RAM doesn't fix...
  14. Closed: Re: How i can applied a lumped port on coaxial cable at HFSS?

    Hi hanadi_alsalti,

    Usually what I do in such cases is integrate the lumped port into the ground plane. Subtract a hole out of the ground plane at your feed location, and put a circular sheet there...
  15. [SOLVED]Closed: Re: [DISCUSSION] Maximum ram usage for Sonnet/HFSS simulation

    I use an off-the-shelf server with 1TB of RAM for simulating large arrays of complex structures. One HFSS instance; the machine has 24 cores so I can usually run up to 48 simultaneous parametric...
  16. Closed: Re: How to get s paramter from finite structure in HFSS? (metmaterial)

    It's actually not a silly question: incident plane wave is probably the hardest to work with; because you have to calculate the scattering parameters yourself.

    The easiest route from here is to...
  17. Closed: Re: How to get s paramter from finite structure in HFSS? (metmaterial)

    Welcome 1dbduddls,

    I assume for an absorber the mode you're interested in is a free-space plane wave. For finite simulations, you pretty much always want driven modal simulations. In the case of...
  18. Closed: Re: Broadband Horn Antenna Input Impedance Matching

    How did you conclude this? What equation did you use?
  19. Closed: Re: About Stripline design questions

    Hi bejing,

    Depending on you feeding mechanism, it could be easier to excite unwanted modes, yes. What are you using?
  20. Closed: Re: HFSS simulating an LC circuits, and understanding ports

    Welcome itsdik,

    It looks like you want to use a lumped port -- placement depends how you want to excite your structure. Is the source in series, or parallel, with this resonator?
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    Closed: Re: Circular Waveguide Module

    Hi musmanm,

    What are you referring to by "flat phase"?
  22. Closed: Re: Unitary property of scattering matrix

    Hi promach,

    Mathematically speaking, a unitary matrix is one which satisfies the property [S]^* = [S]^{-1}. Re-arranging, we see that [S]^* [S] = [I], where [I] is the identity matrix.
    ...
  23. Closed: Re: [Basics] Why is (RF) current "flowing back" underneath the "forward line" ?

    I feel like some clarification may be in order. You're talking about transmission-line modes, in which the currents on the conductors (in this case, the microstrip and ground plane) are balanced...
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    Closed: Re: Patch antenna using lpkf

    Hmm, I havent used that one, although I did use the D104 a bit.

    Did assigning the board outline layer help?
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    Closed: Re: Patch antenna using lpkf

    You probably also need to assign the dielectric to the "Board Outline" layer.

    What milling machine do you have? I may be able to send you a template file.
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