Planewave Excitation Defined as a Port

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Planewave Excitation Defined as a Port

• Workbench 4
• High Frequency Electromagnetics

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Defining planewave radiation before release 9.0

• Prior to release 9.0, planewave excitation was
  prescribed with the PLWAVE command
• Not compatible with the periodic problems that
  can now be set up with the CPCYC command.
• No calculations of transmission and reflection
  coefficients were possible.
• Example planewave propagating through free
  space
• Incoming planewave (E 1,0,0V, ? 90?, ?
  45?) as shown below.
• An animation of the resulting field appears at
  right.

z
PML
??45?
The incoming planewave is not defined at any
particular location. PLWAVE,1,0,0,90,45 PML is
required on all 6 faces of the computational
domain. This procedure is not compatible with
periodicity and no calculations of transmission
and reflection coefficients are possible.
x
y
??90?
3
Defining planewave radiation at release 9.0

• Now, at release 9.0, planewave excitation is
  prescribed with the HFPORT command
• Compatible with the periodicity defined with the
  CPCYC command.
• May calculate transmission and reflection
  coefficients with FSSPARM and HFPOWER.
• Example planewave propagating through free space
• Incoming planewave (E 1,0,0V, ? 90?, ?
  45?) as shown below.
• An animation of the resulting field appears at
  right.

z
PML
??45?
Incoming planewave is now defined as a soft port
on a plane of nodes (the nodes may not be on the
boundary between the computational domain and the
PML). The soft port allows for calculations of
reflection and transmission coefficients. HFPORT,1
,PLAN,,,SOFT,1,0,0,90,45 The port sends radiation
in opposite directions as shown in the animation
above.
y
??90?
x
4
Example Scattering off of a 20 X 20 array of a
periodic structure

• Objectives
• Read in file to automatically create model shown
  below
• Determine variation of x component of electric
  field at 0.1m for ? 90?, -90? lt ? lt 0?
• Calculate RF power parameters with HFPOWER.

z
Incoming planewave 10GHz E 1,0,0V ? 90?, ?
45?
??45?

• Lossy substrate
• ?r 7.5
• 4.5e-2 O-m
• Bottom surface grounded.

y
??90?
x
PML
Equivalent source flags for far field
calculations.
Pattern of nodes on top surface are constrained
in AX (perfectly electric conductor)
air
Substrate
5
Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 1
• Create model by reading in input file
  hf_prdc.inp.
• Command line /input,hf_prdc,inp
• GUI FilegtRead input fromgtchoose
  hf_prdc.inpgtok
• Note predefined components and assemblies in the
  plot at right. You will apply boundary conditions
  and excitation on these.

Apply PEC to top surface of PML mesh
Soft excitation planewave and reflection
coefficient extraction port
Equivalent source flags to enable far field
calculations.
Apply PEC to bottom of substrate and conductive
strip patterned on top
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Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 2
• Apply PEC conditions to components PML_A,
  GROUND_A, and DIPOLE_A. Note that these are area
  components. Consider using box selection as shown
  at right.

2
3
1
4
7
Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 3a
• Use the component manager to select component
  assembly EQV_SRC.

3
1
2
8
Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 3b
• Set equivalent source flags on component
  assembly EQV_SRC. This will allow calculations of
  far field quantities (beyond the boundaries of
  the modeled domain).

1
2
9
Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 4
• Establish periodic boundary conditions
• Select the entire model
• Specify periodicity of prd (a predefined
  parameter) in the x direction as shown at right.
• Repeat the procedure for the y direction.

2
3
1
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Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 5a
• Define soft interior planewave port
• Use the component manager to select component
  PORT_A.

3
1
2
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Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 5b
• Continue defining soft interior planewave port
• Define port 1 (interior port excitation on
  areas) to be a planar wave source.

1
3
2
4
5
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Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 5c
• Continue defining soft interior planewave port
• Define port field polarization and propagation
  direction as shown at right.

1
2
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Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 6
• Declare that this will be a harmonic response
  analysis.

2
1
3
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Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 7
• Set the frequency of the incoming wave to 10 GHz.

1
2
3
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Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 8
• Solve.

1
2
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Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 9
• Read in real part of results
• Command line set
• GUI General Postproc gt Read Results gt First
  Set
• Plot electric field vectors as shown at right.

2
1
3
17
Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 10a
• Plot the x component of the electric field for a
  20 X 20 array of cells having x and y dimensions
  equal to predefined parameter prd.

2
3
1
4
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Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 10b
• Plot the far field for ?90?, with -90?lt?lt0? in
  1? increments at a distance of 0.1m.

2
1
3
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Example Scattering off of a 20 X 20 array of a
periodic structure

• Step 11
• Calculate the power parameters (input and
  reflected power and dielectric loss).

2
3
1
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