In case of a failed or erroneous detection it is possible to define a decoupling plane manually in the Plane Wave dialog. Any PEC plane touching the boundaries is automatically detected as a decoupling plane. If the calculation domain is intersected by a metallic plane which is supposed to extend to infinity, it is necessary to define this structure as a decoupling plane. There is also an automatic detection algorithm for a multilayered background which has been manually built in the model in the z direction. The layers can be defined in either x, y or z direction. The multilayered background may be defined using the editor in the Background Properties dialog window. Ohmic sheets cannot be used as a decoupling plane. The regions above and below the stack are considered as an extension of their respective adjacent layer. This material is isotropic and may have losses. In this configuration each layer represents a block of homogeneous material which extends to infinity in two directions. up Multilayered backgroundĪlternatively an arrangement of materials in layers may be stimulated with a plane wave source (currently it is only available for the frequency domain solver with tetrahedral mesh). This implies that the background material is set to a normal, not to a conducting material. Moreover the surrounding space should consist of a homogeneous material distribution. When using a plane wave source, other excitation ports must not be located on boundary conditions. At a minimum, the boundaries at xmin, ymin and zmin must be defined as open boundaries (for an undisturbed propagation, xmax, ymax and zmax must be open as well). In the picture below, a plane wave is passing the calculation domain in the (1, 1, 1) direction. First, open boundary conditions must be defined at the direction of incidence. When exciting with a plane wave, several conditions must be satisfied. Note: In case of plane wave excitation onto an infinite periodic structure, the unit cell approach is recommended which is accessible via the boundary dialog. When exciting with a plane wave, several conditions must be satisfied which will be discussed in the following section. The phase reference location of the plane wave excitation is the origin of the global WCS (0,0,0). Please note that the input signal of an excited plane wave is normalized due to the user-defined value of the electric field vector (unit: V/m). In combination with farfield monitors, the radar cross section (RCS) of a scatterer may be calculated. The plane wave excitation source provides you the opportunity to simulate an incident wave from a source located a large distance from the observed object. ContentsįSM export as NFS nearfield scan data exchange format Nearfield sources allow for the excitation of the time domain solver, the integral equation solver and the asymptotic solver by nearfield data described in various formats. Farfield sources allow for the excitation of the integral equation solver and the asymptotic solver by data exported in a farfield source file by CST Microwave Studio. Field Source Overview Field Source Overview Several types of field sources are available for imprint in CST Microwave Studio: Plane wave sources allow for the efficient excitation of linear, circular or elliptical plane waves at the boundary of the calculation domain.
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