Example1 Waveguide Filter Loaded with Dielectric Material

General

  • A waveguide filter is loaded with dielectric material.
     

  • Its S-parameters are solved.
     

  • Unless specified in the list below, the default conditions will be applied.
     

 

  • [How to Reduce the Calculation Time]

 

Analysis Space

Item

Settings

Analysis Space

3D

Model unit

mm

 

Analysis Conditions

Item

Settings

Solvers

Electromagnetic Analysis [Hertz]

Analysis Type

Harmonic analysis

Options

Select “Ignore the influence of face/edge electrode thickness” *

* This is the default setting. There are no face electrodes with this model. Therefore it is irrelevant to select it or not.

 

The harmonic analysis is set up as follows.

Tab

Setting Item

Settings

Mesh Tab

Element type

2nd-order element

Multigrid/Adaptive Mesh Method

Select “Use the adaptive mesh method”.

Frequency-Dependent Meshing

Reference frequency: 2.3×10^9[Hz]

Select “The conductor bodies thicker than the skin depth constitute the boundary condition.”

 

The surface of Metal is treated as the boundary condition having some loss,

as Metal is thicker than the skin depth.

Harmonic analysis

Frequency

Minimum: 1.5×10^9[Hz]

Maximum: 3.0×10^9[Hz]

Sweep Type

Select Linear step by division number.

Division number: 100

Sweep Setting

Select Fast sweep

S-parameters variation: 1×10^-3

Input

1.0[W]

 

Model

The model consists of a solid body for WaveGuide, two solid bodies for Metal, and a solid body for dielectric material DR. Metal and DR are placed in WaveGuide.

Set the I/O port boundary condition on both ends of WaveGuide.

 

Body Attributes and Materials

Body Number/Type

Body Attribute Name

Material Name

0/Solid

WaveGuide

000_Air(*)

1/Solid

Metal

008_Cu *

2/Solid

Metal

008_Cu *

3/Solid

DR

DRMat

* Available from the Material DB

 

The material DRMat is dielectric, and its relative permittivity is set up as follow.

Material Name

Tab

Properties

DRMat

Permittivity

Relative permittivity: 2.6

Boundary Conditions

Boundary Condition Name/Topology

Tab

Boundary Condition Type

Settings

PORT1/Face

Electric

I/O Port

Reference Impedance: Select
“Use the characteristic impedance calculated from the port structure”

Number of Modes

Number of precalculated modes: 5

Number of modes used in the actual analysis: 1

Select modes: none

PORT2/Face

Electric

I/O Port

Reference Impedance: Select
“Use the characteristic impedance calculated from the port structure”

Number of Modes

Number of precalculated modes: 5

Number of modes used in the actual analysis: 1

Select modes: none

Outer Boundary Condition

Electric

Electric wall

 

 

 

Results

The diagram below shows the I/O characteristics (S-parameters) of the dielectric loaded waveguide filter.

The pass band is around 2.32 GHz.