I tried to modify the bend waveguide example from the website. The modifications, which I made were change the material from dielectric to metal and chopping the metal waveguide with air waveguide to make it to be a hollow metal waveguide. But I got problem, I got two black square and grow as the simulation time run.... how that can happen and how to fix those black things??? (image attached)
-------------------snip-------------------
(reset-meep)
(define-param sx 40)
(define-param sy 40)
(set! geometry-lattice (make lattice (size sx sy no-size)))
(define-param pad 5) ; padding distance between waveguide and cell
edge
(define-param w 6) ; width of waveguide
(define-param lam 5) ; wavelength
(define-param thk 1) ; thickness of the
hollow metal waveguide
(define-param ctime (* 10 lam) ) ; computational time 10 periods
(define wvg-ycen (* 0.5 (- sy w (* 2 pad)))) ; y center of horiz. wvg
(define wvg-xcen (* 0.5 (- sx w (* 2 pad)))) ; x center of vert. wvg
(set! geometry
(
list
(make block (center (* -0.5 pad) wvg-ycen) (size (- sx pad) w
infinity)
(material metal)
)
(make block (center wvg-xcen (* -0.5 pad)) (size w (- sy pad)
infinity)
(material metal)
)
(make block (center (- (* -0.5 pad) (* 0.5 thk)) wvg-ycen) (size (- sx (+
pad thk)) (- w (* 2 thk)) infinity)
(material air)
)
(make block (center wvg-xcen (- (* -0.5 pad) (* 0.5 thk))) (size
(- w (* 2 thk)) (- sx (+ pad thk)) infinity)
(material air)
)
)
)
(set! pml-layers
(
list
(make pml (thickness 1.0))
)
)
(set! resolution 10)
(set! sources
(
list
(make source
(src (make continuous-src (wavelength lam)))
(component Ez)
(center (+ 1 (* -0.5 sx)) wvg-ycen)
(size 0 w)
)
)
)
(run-until ctime
(at-beginning output-epsilon)
(to-appended "ez" (at-every 0.6
output-efield-z))
)
---------------------------snap---------------------------------------
Thanks
Sendy Phang
Engineering Physics
Computational Electromagnetics Resarch Group
Bandung Institute of Technology
Indonesia
<<attachment: error.png>>
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