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RF & Microwave Engineering Blog Posts

Exploiting Symmetries in RF and Wave Optics Modeling

April 9, 2025

We can simplify and reduce the size and computational complexity of a wave electromagnetics model by taking advantage of any symmetries it may have. Learn how to do so here.

Designing ESD-Safe Electronic Components

August 1, 2024

In the design of electronic components, electrostatic discharge (ESD) can be modeled to provide insight into how to prevent damage. Learn about the capabilities in COMSOL® for modeling ESD in this blog post.

Methods That Accelerate the Modeling of Bandpass-Filter-Type Devices

July 18, 2024

Designing bandpass-filter type high-Q devices with the finite element method in the frequency domain? Here are some methods you can use to speed up the modeling process.

Modeling a THz Photoconductive Antenna with COMSOL Multiphysics®

June 13, 2024

Photoconductive antennas are commonly used in terahertz engineering. Learn how these devices work and how to model one with the Semiconductor Module and RF Module.

Modeling the Speed and Stealth of the Darkstar

March 28, 2024

What would the shock waves around the Darkstar really look like at Mach 7.5? How stealthy is this hypersonic jet? Here, we use modeling and simulation to find out.

Learning from the Two-Capacitor Paradox: Do Capacitance and Inductance Exist?

March 11, 2024

What is the two-capacitor paradox? How can it be resolved with modeling and simulation? Do capacitance and inductance exist? Get answers here.

Understanding Higher-Order Diffraction

January 9, 2024

Explore how to use the Ewald sphere to study diffraction from planar periodic structures. (Interact directly with the model to get the full picture!)

From TV Signals to Toasting: Tuning a Yagi–Uda Antenna to Heat Muffins

December 29, 2023

See how modeling and simulation can be used to test an unconventional heating method. Here, we explore how a Yagi–Uda antenna performs as a hypothetical oven replacement to heat muffins.

Using Different Physics Interfaces for RF Electromagnetic Heating Models

May 4, 2023

RF heating problems can be modeled with both the RF Module and the AC/DC Module. Learn more about their capabilities here.

Verifying the Friis Transmission Equation with FEM–BEM Coupling

February 24, 2023

The RF Module can be used to model transmitter and receiver antennas for line of sight communication. Learn about this application of FEM-BEM coupling here.

Shape Optimization in Electromagnetics: Part 2

December 16, 2022

See 2 examples of how shape optimization can benefit the design of microwave and millimeter wave applications. Part 2 of a 2-part series.

The Use of COMSOL Multiphysics® in the Food Industry

October 13, 2022

Food for thought: Explore how previously failed products and the use of multiphysics simulation inspire innovation in the food industry.

How to Use the New Spatial FFT Feature for Applications in Optics

August 19, 2022

COMSOL Multiphysics® version 6.0 includes the new Spatial FFT feature. Learn how this feature can be used in applications in optics here.

Mode Analysis for Electromagnetic Waveguides in COMSOL®

July 5, 2022

Get an introduction to mode analysis, which can be used to investigate mode characteristics in complex waveguide structures.

Modeling Graphene in High-Frequency Electromagnetics

June 15, 2022

Graphene exhibits a variety of interesting properties, including high elasticity and mechanical strength. In this blog post, we’ll explore how to model graphene in an electromagnetic simulation.

Designing Antireflecting Microstructures for Infrared Applications

June 29, 2021

Explore how 2 microstructure designs can improve the bulk transmittance of silicon (~70%) and cadmium zinc telluride (~79%) to more than 90% within the specific wavelength spectrum.

Voltage and Ground When Modeling Wave-Like EM Fields

June 17, 2021

We continue our discussion of voltage and ground by defining and interpreting these terms for sinusoidally time-varying electromagnetics models.

Do Voltage and Ground Exist?

June 15, 2021

Remember how the terms “voltage” and “ground” were taught in your university electrical engineering classes? Get a precise definition (in terms of modeling computational EM problems) here.

8 Uses of COMSOL Multiphysics® in the Biomedical Industry

June 10, 2021

Read about 8 real-world examples of how engineers and researchers in the biomedical industry are using simulation to advance their innovative designs.

Designing Cavity Filters for 5G Devices with Multiphysics Modeling

April 13, 2021

From radar and microwave ovens to particle accelerators, RF cavity filters are found in a variety of different application areas. Among them: 5G devices and infrastructure.

2020 Isaac Newton Medal and Prize Awarded to Nader Engheta

December 16, 2020

Get an overview of the Isaac Newton Medal and Prize — and the optical physicist who won this year.

3 Examples of Modeling Transitions for Rectangular Waveguides

October 20, 2020

Waveguide to planar, coaxial to waveguide, and rectangular to elliptical: These 3 different transitions for rectangular waveguides can be modeled using COMSOL Multiphysics® and the RF Module.

Modeling Waveguides that Support Multiple Modes 

August 12, 2020

2 ways you can model a waveguide that supports multiple modes: add a PML that can be used to absorb any modes, or explicitly add ports for each possible mode.

Computational Electromagnetics Modeling: Which Module to Use?

July 28, 2020

If you work with a particular electromagnetic device or application area, you might be wondering which module in the COMSOL product suite is right for you. Keep reading for a comprehensive intro.


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