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Type: Posts; User: PlanarMetamaterials

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  1. 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...
  2. 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?
  3. 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...
  4. [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...
  5. 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...
  6. [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...
  7. 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...
  8. 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...
  9. Closed: Re: Broadband Horn Antenna Input Impedance Matching

    How did you conclude this? What equation did you use?
  10. 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?
  11. 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"?
  13. 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.
    ...
  14. 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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    Closed: Re: Patch antenna using lpkf

    Hi Unaz,

    It depends which software you are using. Is it CircuitPro or the older CircuitCAM?
  18. Closed: Re: HFSS Multimode Port definition

    Hi kato01 ,,



    Solve for a sufficiently large number of modes.



    Integration lines are not required for driven-modal waveports.
  19. Closed: Re: Problem with microstrip transient simulation HFSS ANSYS

    When setting up the terminals, did you select the ground plane to be the reference? There should only be one terminal per port.

    If this is set up properly, then you may have unintentional contact...
  20. Closed: Re: Solve for er from propagation constant

    γ = α + jβ, so you want to extract β = Im{γ}

    β = ω/v_Φ, so you want to solve v_Φ = ω/Im{γ} for each radial frequency ω = 2πf

    Lastly, √(e_r) = c/v_Φ, so finally, you have: e_r = (c*Im{γ}/(2πf))˛
  21. Closed: Re: Solve for er from propagation constant

    Aside from the fact that your DUT has an open connection in it, everything looks correct (assuming your substrate is non-magnetic).

    The e_r is the k_eff given in linecalc, 3.006.
  22. Closed: Re: HFSS Cavity with spherical perturbation

    Welcome toumbous,

    The typical course of action is to subtract the smaller object from the larger (ensuring a clone is made), such that the objects no longer intersect.
  23. Closed: Re: Problem with microstrip transient simulation HFSS ANSYS

    It sounds like you need a driven terminal setup. When setting up your wave port, be sure to add terminals (or assign them manually HFSS->Excitations->Assign->Terminal...)
  24. [SOLVED]Closed: Re: Calculating current in a wire in hfss

    Hi Unaz,

    Yes, this is simple. Under the "Draw" menu use the "Line" tool to draw a closed path. By default, HFSS will fill the path to make a surface using the "CoverLines" process. Simply delete...
  25. Closed: Re: HFSS Design Properties No Longer Update

    I've never seen that happen before... check the units to make sure they are correct?
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