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E-Theta Radiation Pattern (Sweep Frequency): SF_ETheta

Summary

Also known as a Swept Frequency measurement polarized along Eθ, this measurement fixes the values of Theta and Phi while sweeping Frequency.

Parameters

Name Type Range
EM Structure Name Subcircuit 1 to 1000 ports
Include Resistive Losses [1] Check box N/A
Include Reflection/Coupling Losses Check box N/A
Theta (degrees) Real 0 to 90 if there is an infinite ground plane below the antenna, or 90 to 180 if there is an infinite ground plane above the antenna, or 0 to 180 if there is not an infinite ground plane.
Phi (degrees) Real -180 to 180
Use Interpolated Data Check box N/A
Sweep Freq Frequency See [2]

[1] NOTE: Some solvers do not support the calculation of resistive loss. If the selected solver does not support this option an error message displays if you select it. (EMSight does not support this; the AWR® AXIEM® simulator does.)

[2] These parameters are dynamic; they change based upon which data source is selected. See “Swept Parameter Analysis ” for details on configuring these parameters.

NOTE: All measurements will have additional parameters that allow you to specify the plotting configuration for swept parameters. These parameters are dynamic; they change based upon which data source is selected. See “Swept Parameter Analysis ” for details on configuring these parameters.

Result

This measurement returns a complex value which represents the normalized far field radiation in the specified direction and polarization.

Definitions

Average Radiation Intensity (ARI):

where

[Ω](impedance of free space)

Total Reflected Power (TRP): Prefl

Assuming you have an antenna with N feeding voltage sources

you solve the corresponding electromagnetic problem and obtain the values of the corresponding Scattering Matrix.

where

are internal impedances of the sources.

Normalized Far Field Radiation Pattern (FFP):

The Add/Modify Measurement dialog box includes Include Resistive Losses and Include Reflection/Coupling Losses options for antenna measurements.

The antenna far-field radiation pattern is normalized by:

  • the average radiation intensity (the Include Resistive Losses and Include Reflection/Coupling Losses options are not selected)

  • the average radiation intensity plus the ohmic losses in the metal components of the antenna (the Include Resistive Losses option is selected and the Include Reflection/Coupling Losses option is not selected.)

  • the average radiation intensity plus the ohmic losses in the metal components of the antenna, plus the total reflected power (the Include Resistive Losses and Include Reflection/Coupling Losses options are both selected.)

E-Theta Radiation Pattern:

This measurement fixes the values of Phi (φ) and Theta (θ) while sweeping Frequency (f).

The result is an equivalent wave variable in the specified direction, such that |result|2 is the partial directivity in that particular direction. This allows you to create arrays of these elements by directly adding the complex results of multiple elements. The result can be displayed as a real value by specifying the magnitude, angle, real or imaginary component in the Add/Modify Measurement dialog box. This value can also be displayed in dB by selecting the dB check box which displays 20 log(|result|). The independent axis for this measurement is in angle units.

EMSight NOTE: During Prad computation a progress bar may display to warn you that a lengthy computation is in progress at the specified frequency. The bar window may display an "Increased Accuracy Required: dAng=value." message. This message delivers a warning that the average power is repeatedly computed at increased accuracy and the angular step used in numerical integration was reduced by half.

The phase center of the measurement is located at the center of the top surface of the enclosure.

AXIEM NOTE: The phase center of the measurement is located at the x=0, y=0 at the bottom boundary.

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