﻿ Balanced Line(Coupled Line) without ConnectorExamples | Product | Murata Software Co., Ltd.

# Example19Balanced Line(Coupled Line) without Connector

### General

• The differential-mode and common-mode S-parameters are solved for a balanced line with connectors.

• 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.

xx

Mesh tab, Harmonic analysis tab and Open boundary tab are set 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: 1×10^9[Hz] Select “The conductor bodies thicker than the skin depth constitute the boundary condition.” Harmonic analysis Frequency Minimum: 1×10^8[Hz] Maximum: 1.5×10^9[Hz] Sweep Type Select Linear step Division number: 10 Sweep Setting Select Discrete sweep Input 1.0[W] Open boundary Type Absorbing boundary Order of Absorbing Boundary 1st degree

### Model

Two microstriplines are placed in parallel. They are connected to co-axial connectors.

The connectors are octagonal cylinders. Their end faces are set with the “I/O port” boundary condition. The integral path

is bridging the inner conductor and the outer perimeter.

Electric wall surrounds the model.

### Body Attributes and Materials

 Body Number/Type Body Attribute Name Material Name 1/Solid CONNECTOR Resin 4/Solid CONNECTOR Resin 5/Solid CONNECTOR Resin 7/Solid CONNECTOR Resin 15/Solid AIR 000_Air(*) 22/Solid METAL 003_Ag * 23/Solid METAL 003_Ag * 25/Solid METAL 003_Ag * 26/Solid METAL 003_Ag * 27/Solid METAL 003_Ag * 28/Solid METAL 003_Ag * 29/Solid SUBSTRATE 006_Glass_epoxy *

* Available from the Material DB

Resin’s property is as follows.

 Material Name Permittivity Resin 2.3

### Boundary Conditions

 Boundary Condition Name/Topology Tab Boundary Condition Type Settings AUTO_PORT_1/Face Electric I/O Port 50[Ω] AUTO_PORT_2/Face Electric I/O Port 50[Ω] AUTO_PORT_3/Face Electric I/O Port 50[Ω] AUTO_PORT_4/Face Electric I/O Port 50[Ω] Outer Boundary Condition Electric Electric wall

### Results

On the [Results] tab

click [Chart] and select SYZ Matrix.

On the SYZ matrix dialog box menu, click “Edit” and “Port Order Exchange/Balance Conversion”.

Select PORT1 and PORT2, and click the “Pair up” button. Then

select PORT3 and PORT4, and click the “Pair up” button.

You will see PORT(1,2)DIF, PORT(1,2)COM, PORT(3,4)DIF, PORT(3,4)COM in this order. You may change the listing order. For example,

select PORT(1,2)COM and PORT(3,4)DIF and press the “Exchange” button.

The S matrix will be listed as in the table below.

Table 1. S Matrix Listing Order and Abbreviation

 Port Number Before Conversion After Conversion Title in Edit Dialog Title in Edit Dialog Note Abbreviatied Title 1 AUTO_PORT_001:m1 DIFF(AUTO_PORT_001:m1,AUTO_PORT_002:m1) Differential mode of AUTO_PORT_001 and AUTO_PORT_002 1d 2 AUTO_PORT_002:m1 DIFF(AUTO_PORT_003:m1,AUTO_PORT_004:m1) Differential mode of AUTO_PORT_003 and AUTO_PORT_004 2d 3 AUTO_PORT_003:m1 COM(AUTO_PORT_001:m1,AUTO_PORT_002:m1) Common (same phase) mode of AUTO_PORT_001 and AUTO_PORT_002 1c 4 AUTO_PORT_004:m1 COM(AUTO_PORT_003:m1,AUTO_PORT_004:m1) Common (same phase) mode of AUTO_PORT_003 and AUTO_PORT_004 2c

In the SYZ Matrix dialog box, select “1 1”, “1 2” “1 3” and “1 4”, and press the [XY Graph]button.
The frequency plots of S parameters will appear.

See the table below for the S(x,x) notation.

Table 2. S Matrix Lookup Table

 Title in Graph With Abbreviated Title S(1,1) S(1d,1d) S(1,2) S(1d,2d) S(1,3) S(1d,1c) S(1,4) S(1d,2c)

1d,2d,1c and 2c are the abbreviated titles.

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