Type: Posts; User: PlanarMetamaterials

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  1. Closed: Re: Difference of Incident field>>scattered field>>total field

    Hello abidahmad2020,

    The total fields are equal to the scattered fields plus the incident fields.

    When you excite an incident plane wave or other variety, this is the incident field. HFSS then...
  2. Closed: Re: what is 'Phi' and 'Theta' angle in far field
  3. Replies

    [SOLVED]Closed: Re: Half-mode SIW Simulation


    Ok, so look at this figure. Your port is exciting a full mode in the HM-SIW, which is why it shows cutoff around 10 GHz.

    There's not an obvious reason why this is happening, it's just...
  4. Replies

    [SOLVED]Closed: Re: Half-mode SIW Simulation

    Alright, so your half-mode data is not self-consistent: the S-parameters clearly indicate that the cutoff frequency is around 5 GHz, but the Beta plot is showing that you have a cutoff around 10 GHz....
  5. Replies

    [SOLVED]Closed: Re: Half-mode SIW Simulation

    They look to be about the same (cutoff around 5 GHz).

    So you showed us the simulations that worked, but not the ones that didn't work. How are we supposed to help you? Please show us the same...
  6. Replies

    [SOLVED]Closed: Re: Half-mode SIW Simulation

    Thank you.

    The setup and solution appear to be correct -- so what is the issue, exactly?

    Can you plot the S-parameters of this setup and that of a similar full-mode SIW?
  7. Closed: Re: Grounded co planar microstrip antenna excitation in HFSS

    - Edit the waveport to excite three modes.
    - Plot the S11 and S21 of each mode.
  8. Replies

    [SOLVED]Closed: Re: Half-mode SIW Simulation

    Can you please show us:

    The fields of the mode(s) you are exciting.
    The surrounding radiation box (extent of the simulation domain).
  9. Replies

    Closed: Re: Direction of wave in HFSS

    Set the k-direction vector in the settings box. I believe this can be a variable.
  10. Closed: Re: Grounded co planar microstrip antenna excitation in HFSS

    Welcome BilalMir,

    You're using a waveport, but only exciting one mode. Have you checked which mode this is? Typically for a CBCPW it's a parallel-plate type mode.

    I would suggest exciting 3...
  11. Replies

    Closed: Re: Free Space VNA Calibration

    You can't use a SOLT calibration for free-space measurement. You need to perform some sort of TRL calibration (ignore the "six-port" title; it's for a two-port analyzer).
  12. Closed: Re: Phase and attenuation constant 1-D periodic structure using CST or HFSS

    I've plotted the results here for n = 1; they look like the results you want (I didn't include the period d or convert from degrees to radians).

  13. Closed: Re: Phase and attenuation constant 1-D periodic structure using CST or HFSS

    The equation is correct (using acosh instead of acos to find complex Gamma, and don't forget to divide by the period of the unit cell!), but you do need to consider branching: try adding some some...
  14. Closed: Re: Phase and attenuation constant 1-D periodic structure using CST or HFSS

    Make sure you are observing the correct mode; the authors in that papers state it's a microstrip mode that they're working with.

    Floquet ports are for exciting plane-wave harmonics, not...
  15. Replies

    Closed: Re: receiver simulation in HFSS

    If you have a voltage source, you should have a set of field solutions.

    Simply draw a line around the transverse cross-section of one of the conductors in the Rx TL, and integrate the H-field...
  16. Closed: Re: What is the cutoff frequency of the capacitively loaded Transmission line

    That's probably for an infinite cascade of embedded capacitors. I'm not sure how well one capacitor would reproduce this result. I would recommend to try additional periods and see of anything...
  17. Closed: Re: Problem with current flow line of Lumped RLC boundary in HFSS

    Welcome anas171,

    The object should be a surface, not a volumetric structure. You can select one face of the box to accomplish this.
  18. 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...
  19. 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...
  20. 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...
  21. 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.
  22. 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.
  23. Replies

    Closed: Re: Capacitance from S parameters

    The above responses have not asked a simple question: the capacitance of what? Please provide a circuit model.
  24. Replies

    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...
  25. Closed: Re: Circular polarization using coupler

    Unfortunately, the issue is then your antenna, and not the excitation. Is it a circular patch?
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