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HFSS questions (missed eigenmodes, visualization)

  1. Feb 16, 2014 #1
    Hi all,

    I am new to Ansoft HFSS, and there are a couple of issues I cannot resolve. I've simulated a box shaped cavity (22 x 12 x 10 mm) with PerfE boundary condition using Eigenmode solver.

    1. I've looked for the first 10 mode. However when comparing with the exact frequencies it turned out that actually a lot of modes are missing from the solution, including the lowest possible mode.

    2. How can I visualize the field distribution in the different modes? In HFSS -> Field -> Plot Fields I cannot choose which mode to plot.

    3. I also tried to get the eigenfrequencies with a different strategy. I've set two faces of the box as waveport and made a frequency scan in Driven mode, looking for peaks in abs( S_{1,1}) vs. frequency plot. However I can get only one frequency. Interestingly this frequeny is not found by the eigensolver.

    Any ideas?
  2. jcsd
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