decblue
Newbie level 4
We know at frequency below plasma frequency of metal the Im(permittivity ε) is large, and/or the Re(ε) is large bu negative.
according to the Debye's function:
ε(ω)=ε∞ - (ωp²)/(ω² +iωγ)
=> ε=ε' +iε''
Now, I wanna simulate accurately metal SRR in the gigahertz region, so I need to key in the right number, but I'm not sure the sign of Dielectric Loss Tangent.
in the "HFSS online Help.pdf" page 15-77, it said
ε=ε' +iε''
can be expressed as
ε=ε'(1-i(ε''/ε'))
where (ε''/ε') is the dielectric loss tangent. then I confused.
for example:
the permittivity of material x, εx
εx=a+ib
then, in the Dielectric Loss Tangent column, what should I enter ???
(b/a) or (-b/a)???
P.S: where can we get the ωp (plasma frequency of metal) and the damping item??
according to the Debye's function:
ε(ω)=ε∞ - (ωp²)/(ω² +iωγ)
=> ε=ε' +iε''
Now, I wanna simulate accurately metal SRR in the gigahertz region, so I need to key in the right number, but I'm not sure the sign of Dielectric Loss Tangent.
in the "HFSS online Help.pdf" page 15-77, it said
ε=ε' +iε''
can be expressed as
ε=ε'(1-i(ε''/ε'))
where (ε''/ε') is the dielectric loss tangent. then I confused.
for example:
the permittivity of material x, εx
εx=a+ib
then, in the Dielectric Loss Tangent column, what should I enter ???
(b/a) or (-b/a)???
P.S: where can we get the ωp (plasma frequency of metal) and the damping item??