Release 11.0 Documentation for ANSYS
This example describes how to do a modal high-frequency analysis of a cavity using ANSYS commands. You can also perform the analysis through the ANSYS GUI menus, using the procedures described in the next example.
This example analysis calculates the TE101 mode eigenfrequency and quality factor in a Teflon filled cavity with copper walls. The example assumes that the dielectric and surface losses are small and do not affect the eigenfrequency solution.
μr = 1.0
εr = 2.05
ρ = 1.0361x105
d = 1.0 m, w = 0.4 m, h = 0.3 m
τ = .58x108 S/m
μr = 1.0
Below is the command input stream used to perform this analysis. All text preceded by an exclamation point (!) is a comment.
/batch,list /prep7 /show /title, Eigenvalue analysis of a dielectric-filled cavity /com, Calculate the TE101 mode eigenfrequency and Quality /com, factor in a Teflon-filled cavity with copper walls /com, _length=1.0 _width=0.4 _height=0.3 epsr=2.05 rvsigma=1.0361e5 cond=0.58e8 et,1,hf120,2 ! HF solid brick element, 2nd order mp,murx,1,1. ! Relative permeability - teflon mp,perx,1,epsr ! Relative permittivity - teflon mp,rsvx,1,rvsigma ! Resistivity - teflon _h=0.08 block,0,_length,0,_width,0,_height ! Create cavity /view,1,1,1,1 /replot esize,_h mshape,0,3d ! Hex elements mshkey,1 ! Mapped mesh vmesh,1 ! Mesh volume da,all,ax,0 ! Set electric wall boundary cond. (tangential E=0) sfa,all,,shld,cond,1.0 ! specify surface shielding properties finish /solu antype,modal ! Modal analysis modopt,lanb,1,2.2e8,4.0e8,,on ! Block Lanczos solver (the default) mxpand,,,,yes ! Expand mode solve finish /post1 set,last /view,,.75,.5,.6 /vup,1,z plvect,h,,,,vect,node,on ! display H field plvect,ef,,,,vect,node,on ! display E field qfact finish
