Truncated Cone

The Truncated Cone Command

The Truncated Cone command allows you to create a “frustum”—a cone with the top portion removed. This versatile tool can be used to model anything from standard conical sections to transitions in horn antennas or even specialized cylindrical supports.

To open the tool, navigate to Draw > Wire Grid / Solid Surface > Truncated Cone.

Defining the Geometry

In the Truncated Cone tab, you configure the physical dimensions and orientation of the structure using the following parameters:

• Base Point Coordinates (Px, Py, Pz): The center of the bottom circular face (Figs. 1 and 2).
• Base Radius & Top Radius: By adjusting these two values, you can create a wide variety of shapes:
  • Top Radius ≈ 0: Approaches a standard Cone.
  • Top Radius = Base Radius: Creates a Cylinder.
  • Different Radii: Creates a standard Truncated Cone.
• Aperture Angle: The angle of the conical slope.
• Orientation (Theta and Phi): These angles define the direction of the central axis connecting the base and top centers.

Curvature Options

• Curved Segments: This provides an exact mathematical representation of the circular edges and the sloped surface. It is recommended for precision modeling to ensure correct current distribution at high frequencies.
• Straight Segments: Approximates the structure using flat facets made of linear wires, forming a polygonal shape.

Faceting and Mesh Attributes

In the Attributes tab, you determine the density of the simulation mesh:

• Facets: Define the number of divisions along the Axis (from base to top) and Azimuthally (around the circumference).
• Wire Grid: Select Circular cross-section to create a “cage” or mesh structure.
• Solid Surface: Select Flat or Rectangular cross-sections. AN-SOF will automatically calculate the necessary strip widths to form a continuous, gapless metallic sheet.

Materials

The Materials tab allows you to set the resistivity (e.g., Aluminum, Brass, or Copper) and apply any optional dielectric insulation to the surface.