Jump to content

mel

Moderators
  • Content Count

    278
  • Joined

  • Last visited

  • Days Won

    13

mel last won the day on January 7

mel had the most liked content!

1 Follower

About mel

  • Rank
    Super User

Profile Information

  • Gender
    Female
  • Country
    South Africa
  • Are you University user?
    No

Recent Profile Visitors

1694 profile views
  1. For the AR card you should use the Position and Rotation boxes. But it would be easier with CADFEKO. Use Field data and the Workplane tab to orient/position the antenna.
  2. Any chance you can send the model? Or maybe just even a section of the model that still generates the error should do. If you can't upload here, contact your local support - see "Technical support" in the Feko User Manual.
  3. mel

    GPU & RL-GO

    It will depend on what angular increment or ray front spacing you specify. You should do a run with GPU on and with GPU off.
  4. I would have to check with the developers on this specific error message, limitations, etc. This will probably only be in the 2nd week of January.
  5. This happens when the waveguide is over-moded. For example if a horn antenna is designed for 3 GHz and you solve it for 10 GHz there will be many propagating modes, where, usually, you would want only 1 mode to propagate.
  6. Just plot the loads/networks results on a new Cartesian graph in POSTFEKO. The image below for a monopole with a load on the wire port and a plane wave over 3 frequencies solved.
  7. Two waveguide ports cannot touch. Maybe offset the center one as seen in the attached file. A very small offset in terms of wavelength would likely not change the results much. triaxialcable_Alt2.cfx
  8. mel

    GPU & RL-GO

    Limited scope for GPU support for RL-GO is currently (Feko 2019) as follows: Only for flat PEC and dielectric triangles but also including isotropic and anisotropic thin dielectric sheets, coated PEC, lossy metallics, surface impedance and characterised surfaces. Note also it is only when manual ray launching settings have been set. If the graphics card is a CUDA card there should be no need to install additional drivers, but always ensure you have the latest drivers installed.
  9. The scope tab only operates on surface currents. So you should specify the Faces not the Regions to include in the near field calculation.
  10. You can add the inductance to a port on the wire that connects to the ground. For a port on the cylinder, you can use the edge port. See e.g here below an edge port for a cylinder dipole. (Or you can make a small gap and use a short wire with a wire port.)
  11. >> However, how can we mesh the cylinder into triangles with the edge lengths the same as the spacing between the inner and outer conductor Just apply a local mesh size on the inner cylinder face. >> what about the outer conductor connection to the ground? should i use wire approximation or cylindrical? You can use either. You will be adding stray inductance to ground with either of them. But at low frequencies this inductance will be very small.
  12. Feko uses the thin wire approximation. You will not necessarily get accurate results by just specifying the wire radius. It only modifies the self impedance of the wires and will not necessarily accurately model the coupling to the shield, which is critically based on the physical spacing between the inner and outer conductors. It would be better, although computationally more expensive, to model the center conductor as a cylinder meshed into triangles. You must ensure that the meshed triangle edge lengths are roughly the same as the spacing between the inner and outer conductor. Secondly the radiation from the terminations can become significant if the the electrical length of the termination segments become large (so at high frequencies). This electrical length is not modeled in the MTL terminations. At higher frequencies you can compensate for the inductive effect by adding an equivalent capacitance.
  13. That problem was fixed in a later version of Feko. Please download and install version 2019.
  14. Hi Lostarmour. Could you please attach the .out file as well. Thanks.
×
×
  • Create New...