RL-GO modeling of reflector antenna
__Hi everyone. I have difficulties with modeling of dual reflector antenna of big size (radii of main reflector is more than 200 lambda) using RL-GO. Since PO with 2 (or more reflections) is very slow, i have to use RL-GO. The problem is that I can not reach convergence of directivity value in main beam direction. Probably i will address to you with this problem next time.
__Here is the question concerning a model of single reflector antenna solved with RL-GO at frequency 9 GHz. After solvinig this problem, i will return to dual reflector one. Geometry parameter's are R=6000.0, f_par=6000.0.
__From FEKO warning in .out file
"...Angular increment to fulfil the convergence criterion (min. number of rays per linear wavelength on the geometry >= 10.00):
Eff. uniform angular increment theta-axis: 0.05004 degrees (uniform grid allows max.: 0.02299 degrees)
phi-axis: 0.05000 degrees (uniform grid allows max.: 0.02570 degrees)..."
i see, that FEKO suggest's values of angular increment's of source's far field pattern pattern less than dθmax=0.02299 degrees, dϕmax=0.02570 degrees. I estimated, that there are about 22.14 point per dθmax (ϕmax=const)and 12.38 point per dϕmax (θmax=const) on the rim of paraboloid. See image i attached.
__Ok i choosed
dϕ =0.015 deg < dϕmax
and different values of angular step
dθ= 0.015, 0.011, 0.010, 0.009, 0.008, 0.007, 0.006 < dθmax.
1) Main question is: why don't i see convergence of results, when decrease angular step dθ. I expected results to converge with decreasing dθ.
Additional questions:
2) From description in help i made a conclusion, that your RL-GO solver look's like physical optics.
3) Am i correct, that your PO solver does not support curvelinear mesh?
Remark:
__I want to point out, that my feeder horn pattern was calculated at frequency 10.6 GHz. Project with reflector antenna is modelled at frequency 9 GHz and FEKO doesn't give me any warnings that this 2 frequencies are different.
__I attached .cfx file of reflector antenna and zipped file with horn far field pattern (forum refuced to attach ".ffe" file).
