slot offset waveguide antenna
Hi
with a λ bounadry, it'll take years to solve the problem and it'll take too much memory, and the meshs won't get as dense as it must.
In a Ansoft 2003 Global seminars, there was a section about generating a slot design curve for a broadwall displaced slot design. The curve showed the resonant length of wave guide slot vs. offset distance. The boundary was stated as λ/4. It had done sweeps for a fixed air box and waveguide structure, with just the change of slot's offset and length. with a little change in the air box, everything will change.
I asked the writter of the seminar, and he answered this, with no more explanation or reply to my mail:
" You are right that you set 1/4 lambda of radiation box. But you did not
tell me other settings when solve: Delta S, number of passes, etc.
I have some comments for your case(wave guide slot antenna):
1. make seed mesh on radiation boundary and the slot. For the radiation
boundary, the default mesh is 1/3 lambda in HFSS v9. Please make 1/6 or 1/8
lambda seeding mesh( for your case, 10GHz, 4mm or 5mm is OK). For the slot,
you'd better make about 1/10 of the slot length seeding.
2. build a "virtual object" around the slot to make the mesh better( not so
long and thin mesh)
What about pmls? Are responses with PMLs really accurate? and how should i choose it's settings?
Thanks a lot
sara