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Example 32: Murata's MAGICSTRAP®

General

The data is available from Murata's web site.
The directivity of MAGICSTRAP® is solved.

Results will vary depending on Femtet version and the PC environment.

[How to Reduce the Calculation Time]

Analysis Space

Item	Settings
Analysis Space	3D
Model Unit	mm

Analysis Conditions

Item	Settings
Solver	Electromagnetic Analysis [Hertz]
Analysis Type	Harmonic Analysis

Harmonic Analysis tab and Open Boundary tab are set as follows.

Tab	Setting Item	Settings
Mesh	Element Type	2nd-order Element
	Multigrid/Adaptive Mesh Method	Select [Apply adaptive meshing].
	Frequency-Dependent Meshing	Reference Frequency: 9.1x108 [Hz] Select [The conductor bodies thicker than the skin depth constitute the boundary condition].
Harmonic Analysis	Sweep Type	Select [Linear Step by Frequency]
	Sweep Values	Minimum: 0.7x109 [Hz] Maximum: 1.2x109 [Hz] Frequency Step: 1.0x106 [Hz]
	Sweep Setting	Select Fast sweep S-parameter Tolerance: 1x10-3
	Input	1.0 [W]
Open Boundary	Type	Absorbing Boundary
Open Boundary	Order of Absorbing Boundary	1st-order

Graphical Objects

A piece of MAGICSTRAP^® is placed on a substrate. They are enclosed in an air cube.

The ports are set inside the device, so they are invisible.

Whole Model	Zoomed in	MAGICSTRAP^®
		*1 External Electrodes

Model Creation

Download the MAGICSTRAP^® (P/N: LXMS21ACMF-218) data from Murata's web site. Unzip it in a folder.
Read the database file, LXMS21ACMF-218.fvdb from the folder. See [How to Utilize Black Box DB].
Import the MAGICSTRAP^® (P/N: LXMS21ACMF-218) data from the model DB tree.
Import the associated PCB data file (MS218_PCB_Normal.x_t). The import procedure is explained in [Parasolid File]. When the x_t file is imported, the MAGICSTRAP^® and the PCB are aligned in position automatically.
Create the air cube.

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
1/Solid	PCB	008_Cu *2
2/Solid	PCB	006_Glass_epoxy *2
3/Solid	Air	000_Air(*2)
4/Solid	MagicStrap	MagicStrap *1

*1 Imported from Murata's CAE data
The body attributes and material properties related to the inductor will be replaced by the black box data when the solver runs. Therefore the settings here are irrelevant.

*2 Available from the material DB.

Boundary Conditions

The ports are set inside the device, so they are invisible. The impedance of the IC is set on the ports even though it is not visible.

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Settings
Outer Boundary Condition	Electric	Open Boundary

Results

The radiation pattern of MAGICSTRAP^® at 910 MHz is plotted with polar graph.

The unit is [dB].