# What is FEM and FDTD?

## What is FEM and FDTD?

FDTD is for time varying field and FEM is for harmonic field (time is frozen).

### What is FDTD lumerical?

Lumerical FDTD is the gold-standard for modeling nanophotonic devices, processes and materials. This finely tuned implementation of the FDTD method delivers reliable, powerful and scalable solver performance over a broad spectrum of applications.

What is FDTD solver?

The Finite-Difference Time-Domain (FDTD) method[1,2,3] is a state-of-the-art method for solving Maxwell’s equations in complex geometries. Being a direct time and space solution, it offers the user a unique insight into all types of problems in electromagnetics and photonics.

What is FDTD used for?

What is FDTD? The Finite-Difference Time-Domain (FDTD) method is a rigorous and powerful tool for modeling nano-scale optical devices. FDTD solves Maxwell’s equations directly without any physical approximation, and the maximum problem size is limited only by the extent of the computing power available.

## What is Yee cell?

Finite-difference time-domain (FDTD) or Yee’s method (named after the Chinese American applied mathematician Kane S. Yee, born 1934) is a numerical analysis technique used for modeling computational electrodynamics (finding approximate solutions to the associated system of differential equations).

### What is lumerical used for?

Lumerical develops photonic simulation software – tools which enable product designers to understand light, and predict how it behaves within complex structures, circuits, and systems.

What is finite integration technique?

The finite integration technique (FIT) is a spatial discretization scheme to numerically solve electromagnetic field problems in time and frequency domain. It preserves basic topological properties of the continuous equations such as conservation of charge and energy.

Why is Hfss used?

HFSS captures and simulates objects in 3D, accounting for materials composition and shapes/geometries of each object. HFSS is one of several commercial tools used for antenna design, and the design of complex radio frequency electronic circuit elements including filters, transmission lines, and packaging.

## What is lumerical simulation?

### What is finite integration technique CST?

The Finite Integration Technique (FIT) is a consistent formulation for the discrete representation of Maxwell’s equations on spatial grids. First proposed by Weiland [1] in 1977, the finite integration technique can be viewed as a generalization of the FDTD method. It is also similar to the finite element method.

Are Maxwell’s equations Hyperbolic?

Maxwell’s equations can be formulated as a hyperbolic system of partial differential equations. This gives access to powerful techniques for numerical solutions.

Is Ansys and HFSS same?

Ansys HFSS is a 3D electromagnetic (EM) simulation software for designing and simulating high-frequency electronic products such as antennas, antenna arrays, RF or microwave components, high-speed interconnects, filters, connectors, IC packages and printed circuit boards.

## How do I learn Lumerical FDTD?

Learn how to best use your Lumerical products

1. Take an online course today. Ansys Innovation Courses offers online courses to help users quickly learn how to use our products.
2. Find it in our extensive knowledge base.
3. Get started using our application gallery.

### What is CST use?

CST Studio Suite® is a high-performance 3D EM analysis software package for designing, analyzing and optimizing electromagnetic (EM) components and systems. Electromagnetic field solvers for applications across the EM spectrum are contained within a single user interface in CST Studio Suite.

What is finite integration?

What is a full wave solver?

Solves small, critical structures up to very high frequencies, typically for SerDes channels. Solver jobs can be distributed across all the cores in a computer and across multiple machines.

## What is D and H in Maxwell’s equations?

5.1 MAXWELL EQUATIONS Here, D is the electric displacement, H is the magnetic vector, σ is the specific conductivity, ε is the dielectric constant (or permittivity), and μ is the magnetic permeability.

### What is the difference between HFSS and CST?

HFSS is based on Finite Element Method (FEM) which is more accurate for designing antennas while CST is based upon Finite Integration in Technique (FIT) and is also popular among antenna designers due to ease in simulations. So, you can go for anyone, but for microwave tubes, use CST simulation tool.