Pushhead
Full Member level 4
cst waveguide
Hello all,
I am trying to calculate losses of a waveguide using a 20 mm microstrip line on a grounded dielectric slab.
The formula (and some other microstrip calculators) show that overall losses should be ~ 5.65 dB/m (0.113 dB for 20mm line).
The Problem :
After simulating the waveguide i'm getting losses of ~3.1 dB/m, which disagrees with the m.s. calculators.
Can you help me understanding what's wrong ?
Tnx alot,
P.
Line specifications:
freq.=5GHz
Zo=50ohm
sub. height = 20*mil
Copper(line) thickness = 1.4*mil
Copper(line) width=44*mil
ε=3.48, tgδ=0.004
Copper cond. σ=5.8e7[S/m]
εeff~2.72
overall length = 20mm
BTW :
In my opinion the meshing is OK, i.e. even the thickness of the line is defined by 2 congruent mesh lines.
Tnx again,
P.
Hello all,
I am trying to calculate losses of a waveguide using a 20 mm microstrip line on a grounded dielectric slab.
The formula (and some other microstrip calculators) show that overall losses should be ~ 5.65 dB/m (0.113 dB for 20mm line).
The Problem :
After simulating the waveguide i'm getting losses of ~3.1 dB/m, which disagrees with the m.s. calculators.
Can you help me understanding what's wrong ?
Tnx alot,
P.
Line specifications:
freq.=5GHz
Zo=50ohm
sub. height = 20*mil
Copper(line) thickness = 1.4*mil
Copper(line) width=44*mil
ε=3.48, tgδ=0.004
Copper cond. σ=5.8e7[S/m]
εeff~2.72
overall length = 20mm
BTW :
In my opinion the meshing is OK, i.e. even the thickness of the line is defined by 2 congruent mesh lines.
Tnx again,
P.