HFSS Electromagnetic Simulation

HFSS Tutorial

HFSS is a full-wave 3D electromagnetic field solver used to test and analyze RF, microwave, antenna, and superconducting quantum circuit designs before manufacturing. In the QClang documentation, place this tutorial after chip synthesis because the synthesized chip geometry becomes the input for electromagnetic simulation.

HFSS tutorial image: superconducting quantum circuit, transmon, resonator, field distribution, and fabrication layers.

Why HFSS is needed	It predicts device performance before manufacturing, reduces design mistakes, and saves prototype cost.
Core method	HFSS uses the Finite Element Method to solve Maxwell’s equations in complex 3D geometries.
Driven Modal	Used for antennas, filters, waveguides, S-parameters, field overlays, gain, and radiation patterns.
Driven Terminal	Used for PCB traces, connectors, cables, voltage/current behavior, impedance, and signal integrity.
Eigenmode	Finds natural resonant frequencies, cavity modes, waveguide cutoffs, and Q-factors without ports.
Results	Field plots, S11 reflection, S21 transmission, resonant frequencies, and quantum circuit field behavior. Workflow: geometry, materials, boundaries, mesh, simulation, results.

Field visualization used to inspect electromagnetic behavior.