Transverse impedance of Ceramic collimator.

Comparison of HFSS versus GdfidLA.Grudiev

07.05.08

GdfidL setup

Z

Lc

PML PMLPerfect ConductorCollimator: εr, σ Z

Lc

PML PMLPerfect Conductor

Collimator: εr, σ

2b

d

Setup 1: PML b.c.infinitely long setup

Setup 2: Short Circuit b.c. finite length setup

Dependence on the Lc. εr=5, σ=0Setup1: PMLBC

Setup2: SCBC

Numerical effect

f[MHz]

f[MHz]

Dependence on the mesh. Lc=1m, εr=5, σ=0Setup1: PMLBC

Setup2: SCBCf[MHz]

f[MHz]

HFSS setup. Infinitely long setup

From V. Vaccaro (1994)

2

22

0

0

000

000

0

000

0

1

1

lt

R

RDl

R

D

cZZ

k

kkjZZ

C

jRLZ

LCL

Rjk

LCL

Rjk

b=2mmd=10mm

L0

Δ/2=1mm

Variation of σ=1 - 10-6, εr=1 , Lc=1m, d=10mm

Very good agreement between HFSS and GdfidL

f[MHz]

Variation of σ=1 - 106, εr=1, Lc=1m, d=10mm

No agreement between HFSS and GdfidL for σ > 10. GdfidL mesh is too bad ?

f[MHz]

Variation of εr=2-20, σ=0, d=10mm

Imaginary part of the transverse impedance

f[MHz]

Variation of d=1-20mm, σ=0, εr=5. HFSS setup

f[MHz]

Variation of d=1-20mm, σ=1, εr=1. HFSS setup

f[MHz] f[MHz]