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Analysis of Two Coaxial Microwave Chambers having Possible use for Characterization of Materials a Finite Element Analysis ( FEA ) using Comsol Multiphysics. Craig E. Nelson - Consultant Engineer.

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slide1

Analysis of Two Coaxial Microwave Chambers having Possible use for Characterization of Materials

a Finite Element Analysis ( FEA )

using

Comsol Multiphysics

Craig E. Nelson - Consultant Engineer

slide2

The two kinds of coaxial microwave chambers are analyzed for the purpose of obtaining a better understanding of the nature and structure of the internal fields.

Within the chambers is a region where the conductivity is .001 Siemens/meter. This value of conductivity is that of a semiconductor or weakly conducting electrolyte solution.

slide3

Coaxial Microwave Chamber Type 1

A numerical experiment with a semiconducting material within the microwave energy flow path

slide4

Name

Variable

Value

Description

epsilon0

epsilon0_weh

8.854187817e-12

Permittivity of vacuum

mu0

mu0_weh

4*pi*1e-7

Permeability of vacuum

nu

nu_weh

1e9

Frequency

mu = free pace

eps = free pace

Conductivity = 0 Siemens/meter

mu = free pace

eps = free pace

Conductivity = .001 Siemens/meter

3.2.1. Scalar Variables.

slide5

One radial mode is present

complex radial modes are present and the wavelength is decreased

Radial Component of the E field

slide6

Coaxial Microwave Chamber Type 2

A numerical experiment with a semi-conducting material within the microwave energy flow path

In this model, the inner conductor had been enlarged so as to control the radial modes that are otherwise be present

slide7

Name

Variable

Value

Description

epsilon0

epsilon0_weh

8.854187817e-12

Permittivity of vacuum

mu0

mu0_weh

4*pi*1e-7

Permeability of vacuum

nu

nu_weh

1e9

Frequency

mu = free pace

eps = free pace

Conductivity = 0 Siemens/meter

mu = free pace

eps = free pace

Conductivity = .001 Siemens/meter

3.2.1. Scalar Variables.

slide8

One radial mode is present

complex radial modes are not present but the wavelength is decreased

Azimuthal Component of the E field

slide9

Summary and Conclusions

Two types of similar but different coaxial chambers have been analyzed by means of the finite element method ( FEA ).

The results show the effect of material conductivity on wavelength within the coaxial chambers.

The results show that control of radial modes requires expanding of the dimensions of the inner conductor

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