Overview of the User’s Guide
The RF Module User’s Guide gets you started with modeling using COMSOL Multiphysics. The information in this guide is specific to this module. Instructions how to use COMSOL in general are included with the COMSOL Multiphysics Reference Manual.
As detailed in the section Where Do I Access the Documentation and Application Libraries? this information can also be searched from the COMSOL Multiphysics software Help menu.
Modeling with the RF Module
The RF Modeling chapter familiarize you with the modeling procedures. A number of examples available through the Application Libraries window also illustrate the different aspects of the simulation process. Topics include Preparing for RF Modeling, Simplifying Geometries, and Scattered Field Formulation.
RF Theory
The Electromagnetics Theory chapter contains a review of the basic theory of electromagnetics, starting with Maxwell’s Equations, and the theory for some Special Calculations: S-parameters, lumped port parameters, and far-field analysis. There is also a list of Electromagnetic Quantities with their SI units and symbols.
Radio Frequency
Radio Frequency Interfaces chapter describes:
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The Electromagnetic Waves, Frequency Domain Interface, which analyzes frequency domain electromagnetic waves, and uses time-harmonic and eigenfrequency or eigenmode (2D only) studies, boundary mode analysis and frequency domain, modal.
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The Electromagnetic Waves, Transient Interface, which supports the Time Dependent study type.
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The Electromagnetic Waves, Time Explicit Interface, which solves a transient wave equation for both the electric and magnetic fields.
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The Electromagnetic Waves, Asymptotic Scattering Interface, which supports the Frequency Domain study type.
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The Electromagnetic Waves, Boundary Elements Interface, which analyzes time-harmonic electromagnetic waves using the boundary element method.
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The Electromagnetic Waves, FEM-BEM Interface, which uses the BEM method to compute the electric fields outside the FEM domains, and supports frequency-domain modeling in 2D and 3D.
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The Transmission Line Interface, which solves the time-harmonic transmission line equation for the electric potential.
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The Transmission Line, Transient Interface, which solves the time-domain transmission line equation for the electric potential.
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The Transmission Line, Parameters Interface, which computes the per-unit-length parameters, characteristic impedance, and propagation constant for two-conductor transmission lines, with a frequency-domain formulation.
The underlying theory is also included at the end of the chapter.
Electrical Circuit
AC/DC Interfaces chapter describes The Electrical Circuit Interface, which simulates the current in a conductive and capacitive material under the influence of an electric field. All three study types (Stationary, Frequency Domain, and Time Dependent) are available. The underlying theory is also included at the end of the chapter.
Heat Transfer
Heat Transfer Interfaces chapter describes the Microwave Heating interface, which combines the physics features of an Electromagnetic Waves, Frequency Domain interface from the RF Module with the Heat Transfer interface. The predefined interaction adds the electromagnetic losses from the electromagnetic waves as a heat source and solves frequency domain (time-harmonic) electromagnetic waves in conjunction with stationary or transient heat transfer. This physics interface is based on the assumption that the electromagnetic cycle time is short compared to the thermal time scale (adiabatic assumption). The underlying theory is also included at the end of the chapter.