Analytic Port Types

Analytic mode alignment is available for certain port types by selecting Align modes analytically using coordinate system in the Modes tab in the Wave Port setup window. If analytic mode alignment is selected for a port that is not supported, the port setup becomes invalid. Here is a summary of the validation for analytic mode alignment:

• The port geometry must correspond to a known analytic type, as follows:
• Rectangular. The port must have four linear edges which meet at right angles. Square ports are a special case of rectangular.
• Circular. The port must have all curved edges. The radius, perimeter, and area of the face must be consistent with those of an ideal circle.
• Faceted Circular. The port must have at least 16 edges, all linear and of equal length. The radius, perimeter, and area of the face must be consistent with those of an ideal polygon.
• Circular or Faceted Coax.

Explicit. The port face must have one set of inner and one set of outer edges. The inner radius, outer radius, face area and perimeter must be consistent with an ideal coaxial circle or polygon.

Implicit. The port face itself must be circular or faceted circular, and it must have a circular or faceted circular conducting object touching it and aligned with the face center.

• The port must be assigned to a single face of a 3D object whose material is isotropic. Assignment to sheets is not allowed, as this makes it difficult to determine the object material.
• No other material can contact the port, except for the inner conductor of a coax.
• Only Perfect E and Finite Conductivity boundaries can contact the port.

When reading legacy projects prior to v12, HFSS automatically tests ports with the "Polarize E Field" option enabled. If they qualify for analytic alignment, that option will be selected, and U-V lines will be set from the first two modal integration lines.