Filter design is the process of designing a filter (in the sense in which the term is used in signal processing, statistics, and applied mathematics), often a linear shift-invariant filter, which satisfies a set of requirements, some of which are contradictory.
ANSYS, Inc. is a engineering simulation software (computer-aided engineering, or CAE) developer that is headquartered in Canonsburg, Pennsylvania, United States. The company was founded in 1970 by Dr. John A. Swanson and originally named Swanson Analysis Systems, Inc.
WR-22 to round waveguide adapter
The Cassegrain reflector antenna on my 47 GHz radio has a round waveguide feed, whereas the electronics in the radio interface with standard WR-22 waveguide for easier testing, verification, and alignment.
The adapter was designed and modeled in Ansoft's HFSS.