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Far Zone Sensor uses the near- to far-field transform to compute antenna radiation and radar cross section (RCS) patterns at a theoretical infinite distance from the simulation space. It is available either when all six outer boundary conditions are absorbing, or when one PEC boundary and five absorbing are used.
Users can create a far zone sensor by right-clicking on Far Zone Sensors in the Project Tree, then selecting New Far Zone Sensor. The editor across the top of the Geometry window consists of two tabs: Geometry and Properties.
Under the geometry tab, users can define where to collect far zone data by choosing a Coordinate System Type: Theta/Phi, Alpha/Epsilon, or Elevation/Azimuth.
The selected coordinate system determines the available field values and settings below. By default, the theta, phi coordinate system's start and stop angles define a 3-D radiation pattern.
Under the properties tab, users can choose to collect either broadband or steady-state data.
The Collect Broadband Data option computes time-domain far-field results during timestepping. A fast Fourier transform (FFT) of the time-domain signal provides broadband results. The default Use Project Value setting determines the sampling interval according to project properties editor specifications, including the Use Automatic Time Domain Data Sampling Interval setting, frequency range of interest, and active waveforms. Deselecting the default setting allows users to manually enter a sampling interval.
Users should note that computation time increases with the number of specified angles, and this calculation is therefore recommended when far-zone results are desired at only a few points, as well as when far-zone time-domain fields are needed.
The Collect Steady State Data option computes steady-state tangential electric and magnetic fields on the far-zone box in a manner consistant with all steady-state data. As a post-processing step, the near- to far-field transform computes the far-field data.