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Home / Examples / Electromagnetic Analysis [Hertz] / Example 26: Patch Antenna Array

Example 26: Patch Antenna Array


General

  • The characteristics of a patch antenna array are analyzed.
     

  • The directivity and S-parameters are solved.
     

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

  • Obtain this session's project file. (Right-click and choose 'Save link as')


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

 

Analysis Space

Item

Settings

Analysis Space

3D

Model Unit

mm

 

Analysis Conditions

Item

Settings

Solver

Electromagnetic Analysis [Hertz]

Analysis Type

Harmonic Analysis

 

 

Mesh tab, Harmonic analysis tab and Open boundary tab are set as follows.

Tab

Setting Item

Settings

Mesh Tab

Frequency-Dependent Meshing

Reference Frequency: 6x109 [Hz]

Select [The conductor bodies thicker than the skin depth constitute the boundary condition].

Harmonic analysis

Sweep Type

Select [Linear Step by Number of Divisions]

Sweep Setting

Minimum: 5×109 [Hz]

Maximum: 7x109 [Hz]

Number of Divisions: 100

Sweep Setting

Select Fast sweep

S-parameter Tolerance: 1x10-3

Input

1.0 [W]

Open boundary

Type

Absorbing Boundary

Order of Absorbing Boundary

1st-order

 

Model

Antenna pattern METAL is a sheet body created on a rectangle substrate SUBSTRATE.

It is covered with spherical air (AIR). Open boundary is set on the surface of AIR.

 

 

Body Attributes and Materials

Body Number/Type

Body Attribute Name

Material Name

1/Sheet

METAL

003_Ag

5/Sheet

METAL

003_Ag

10/Sheet

METAL

003_Ag

15/Solid

SUBSTRATE

006_Glass_epoxy

16/Sheet

METAL

003_Ag

19/Sheet

Imprinting body

 

20/Sheet

Imprinting body

 

24/Solid

AIR

000_Air

* Available from the material DB

 

Boundary Conditions

Boundary Condition Name/Topology

Tab

Boundary Condition Type

Settings

Port_001/Face

Electric

Port

Reference Impedance: Select [Specify]

and enter 50 [Ohm].

Number of Modes

Number of Precalculated Modes: 5

Number of Modes Used in the Actual 3D Analysis: 1

  Select Modes: None

Port_002/Face

Electric

Port

Same as Above.

Outer Boundary Condition

Electric

Open Boundary

 

 

Results

S-parameter S11 is shown below.

 

 

The figure below shows the radiation pattern with the weighed input.

See the Field Superposition Setting for the detail.

 

 

 

MAG

PHASE [deg]

Red line

Port_001

1.0

0.0

Port_002

1.0

0.0

Black line

Port_001

1.0

0.0

Port_002

1.0

180