Resonance Simulation
Resonant frequency and mode analysis in EMWORKS for cavities, filters, resonators and related RF structures.
What Resonance Analysis Does in EMWORKS
The resonance solver in EMWORKS finds the natural resonant frequencies and field distributions (modes) of 3D structures. It runs on models defined in the RF & MICROWAVES module and is used to understand how geometry and materials set the resonant behaviour of a device.
Typical uses include cavity and waveguide resonators, resonant filters, planar and dielectric resonators and other structures where discrete modes and Q-factors are important.
Key Capabilities
Eigenmode analysis: Compute resonant frequencies and associated field patterns (eigenmodes) for closed or partially open structures.
Mode identification: Inspect electric and magnetic field distributions, surface currents and stored energy to identify which physical mode is being excited and how it relates to the geometry.
Q-factor estimation: Estimate unloaded Q-factors based on stored energy and loss, including the effect of material properties and, when relevant, conductor losses.
Material and geometry impact: Assess how changes in dimensions, cut-outs, tuning elements or materials shift resonant frequencies or modify field confinement.
Boundary condition control: Set appropriate boundary conditions (for example, perfect electric or magnetic conductors, symmetry planes or absorbing regions) to reflect the intended physical setup.
Devices and Structures Commonly Analyzed
Resonance analysis in EMWORKS is typically applied to:
Cavity resonators – Rectangular, circular and more complex cavities used in filters, oscillators and measurement fixtures.
Waveguide resonators and sections – Waveguide sections with irises, posts or other features that support specific modes.
Dielectric resonators – Resonant structures based on dielectric materials used in filters and oscillators.
Planar and microstrip resonators – Printed resonators and related structures on PCBs or substrates that form the basis of filters and frequency-selective elements.
Filter structures – Resonant sections within waveguide, cavity or planar filters where mode behaviour and coupling must be understood.
Output of EMWORKS' Resonance Analysis
A typical resonance study in EMWORKS provides:
A list of resonant frequencies within the specified range
Field plots for each computed mode (electric and magnetic field distributions)
Estimates of stored electric and magnetic energy by mode
Estimates of unloaded Q-factor when material and conductor losses are included
These results help link geometric features to resonant behaviour and guide adjustments in dimensions, materials or coupling structures.