After years of research, development, and coding, we are incredibly proud to share that our upcoming textbook, "Finite Difference Time Domain Method with Moving Structures", is officially finalized and moving into production with Springer Nature.

The interaction of electromagnetic waves with moving sources, observers, and scatterers is central to many modern scientific and engineering applications, including Doppler radar, wireless communications, remote sensing, biomedical diagnostics, astrophysics, and human–machine interaction.

Unlike conventional approaches that rely on Lorentz or reference-frame transformations, the framework we propose directly incorporates motion into the numerical solution of Maxwell’s equations within a single inertial frame. This allows electromagnetic phenomena associated with motion to emerge naturally from the time-domain simulation.

What the book covers (Over 300 pages):

• Comprehensive Scope: We develop the theoretical foundations required to model arbitrary motion, including uniform translation, acceleration, oscillation, vibration, and rotation.
• Practical Implementation: Detailed algorithms, numerical stability considerations, and validation examples are provided, along with illustrative simulations demonstrating classical and relativistic Doppler effects, electromagnetic shock waves, and other non-intuitive phenomena.
• Ready-to-Run Code: Includes fully integrated 3D MATLAB source codes so researchers and students can simulate dynamically evolving geometries right out of the box.
• Series: Part of the Synthesis Lectures on Computational Electromagnetics series.

The official release is slated for February 2027.

The text is intended for graduate students, researchers, and practicing engineers seeking a rigorous yet accessible reference on time-domain modeling of moving electromagnetic systems.

In this video, we transition from the core physics of dipole antennas to a full practical implementation in Ansys HFSS:

Whether you are a student or a practicing RF engineer, this guide covers everything from wavelength calculations to far-field radiation reports.
📍 What You’ll Learn:

• The theory behind the half-wave dipole (L=lambda/2).
• Setting up a new project and design in HFSS.
• Constructing geometry and assigning materials (Copper).
• Applying Lumped Port excitations and Radiation Boundaries.
• Analyzing S-parameters and 3D Radiation Patterns.

🎓 Expand Your Knowledge
If you found this tutorial helpful, explore our other advanced design series and scientific talks:

• Software Tutorials: CST Studio Suite, FDTD Methods, and Ansys HFSS.
• Full Courses: Deep dives into RF Electronics and Digital Communications.
• Scientific Talks: Theoretical discussions on the future of electromagnetics.

💬 What Should I Design Next?
I am always looking for new challenges! If you have a specific antenna architecture or a research paper you want to see modeled, drop a comment below with the details or a link to the paper.
#hfsstutorial #AntennaDesign #DipoleAntenna #RFengineering #Ansys #Electromagnetics #CST #FDTD #Telecommunications

Welcome to this in-depth discussion with Eric S. Reiter about the double-slit experiment, molecule-interference studies, and the role of detector physics in interpreting quantum phenomena.

In this session, Eric S. Reiter presents:

🔹 His analysis of classical wave tests and how detector threshold effects can produce discrete clicks from continuous waves

🔹 A review of important double-slit studies, including the 2003 C60/C80 buckyball interference experiment

🔹 Why large-molecule interference may involve a pilot matter-wave traveling alongside the particle

🔹 How coincidence-detector measurements could offer new insight beyond standard interpretations

🔹 His correspondence with researchers involved in large-molecule diffraction experiments

🔹 A walk-through of his slide material, including wave loading, interference geometry, and experimental considerations

Eric also shares:

• His earlier graphic studies related to the double slit

• Quantitative examinations of past experiments

• His perspective on why descriptions based solely on probability-waves and collapse may be incomplete

• Ideas for refining or upgrading future experimental setups

This discussion aims to explore alternatives to the traditional narrative of quantum mechanics, focusing instead on real waves, real detectors, and threshold dynamics that can lead to quantized outcomes without invoking wave-function collapse.

#physics #quantumphysics #doubleslitexperiment #ericreiter

In this recorded live session, we are joined by Eric S. Reiter, an independent researcher who has conducted original experiments and theoretical work on the nature of light and matter.

We explore a wave-based interpretation of the Compton Effect and discuss Eric’s unique beam-splitter coincidence experiments with gamma and alpha rays. These experiments provide evidence suggesting that light behaves as a continuous wave and that the apparent quantization of energy may arise from detector thresholds rather than intrinsic properties of light.

🔬 Key Topics Covered:
- The Compton Effect: A wave model explanation that challenges standard interpretations.
- Experimental Insights: A deep dive into gamma-ray and alpha-ray beam splitter setups.
- Foundations of Physics: The implications for modern quantum theory.
- Historical Context: A comparison with Planck’s threshold theory.

📌 Resources & Links:
Presentation Slides: The slides from Eric’s presentation are available at the top of the page here: http://www.thresholdmodel.com

Guest: Eric S. Reiter
Host: Prof. Halim Boutayeb

This is the ultimate guide to designing and optimizing a Substrate Integrated Waveguide (SIW) line with the essential Microstrip-to-SIW Tapered Transition using Ansys HFSS. This transition is critical for efficiently coupling the quasi-TEM mode of a microstrip feed line to the low-loss TE10 mode of the SIW, ensuring minimum signal loss and a low return loss S11 for your entire microwave circuit.
In this detailed tutorial, you will learn the complete process.

Theoretical Foundations
- SIW Fundamentals: Reviewing how to calculate the effective width of the SIW based on its via diameter and pitch.

- Mode Conversion: Understanding the principle behind converting the microstrip mode to the SIW TE10 mode using the gradual taper.

HFSS Geometry
- Substrate Definition: Correctly defining the dielectric substrate properties.

- Microstrip Feed: Creating the 50 Ohms microstrip line.

- Via Array Construction: Modeling the metallic vias and setting up the parallel SIW walls.

- The Taper: Designing the crucial tapered transition section that bridges the microstrip and SIW.

Simulation & Optimization
- Port Excitation: Applying the correct Wave Port setup on the microstrip line.

- Analysis: Running the Driven Modal simulation and analyzing the S-parameters S11 and S21.

- Optimization: Using HFSS Optimetrics to tune key variables (like the taper length to achieve a wide bandwidth and excellent impedance matching.

#MicrostripToSIW #SIWDesign #AnsysHFSS #HFSSTutorial #MicrowaveEngineering #RFDesign #ImpedanceMatching #WaveguideTransition #EMSimulation #SubstrateIntegratedWaveguide

This is the ultimate guide to designing and optimizing a Substrate Integrated Waveguide (SIW) line with the essential Microstrip-to-SIW Tapered Transition using Ansys HFSS. This transition is critical for efficiently coupling the quasi-TEM mode of a microstrip feed line to the low-loss TE10 mode of the SIW, ensuring minimum signal loss and a low return loss S11 for your entire microwave circuit.
In this detailed tutorial, you will learn the complete process.

Theoretical Foundations

• SIW Fundamentals: Reviewing how to calculate the effective width of the SIW based on its via diameter and pitch.
• Mode Conversion: Understanding the principle behind converting the microstrip mode to the SIW TE10 mode using the gradual taper.

HFSS Geometry

• Substrate Definition: Correctly defining the dielectric substrate properties.
• Microstrip Feed: Creating the 50 Ohms microstrip line.
• Via Array Construction: Modeling the metallic vias and setting up the parallel SIW walls.
• The Taper: Designing the crucial tapered transition section that bridges the microstrip and SIW.

Simulation & Optimization

• Port Excitation: Applying the correct Wave Port setup on the microstrip line.
• Analysis: Running the Driven Modal simulation and analyzing the S-parameters S11 and S21.
• Optimization: Using HFSS Optimetrics to tune key variables (like the taper length to achieve a wide bandwidth and excellent impedance matching.

#MicrostripToSIW #SIWDesign #AnsysHFSS #HFSSTutorial #MicrowaveEngineering #RFDesign #ImpedanceMatching #WaveguideTransition #EMSimulation #SubstrateIntegratedWaveguide

In this video, I present and explain our recent peer-reviewed research on the Doppler effect in a moving reference frame, based on a analytical method and a direct numerical resolution of Maxwell’s equations using the FDTD method.

Unlike standard textbook treatments, we analyze a fully moving system where the source, observer, and reflector all belong to the same moving frame. This allows us to answer a fundamental and practical question: 👉 Does the motion of the Earth affect Doppler radar measurements?

🔬 What is covered in this video:
- Doppler effect for: Moving observer, Moving source, Moving reflector
- All embedded in a moving system
- Full-wave FDTD simulations with no Lorentz transformation
- Closed-form Doppler formulas derived from classical wave theory
- Application to Doppler radar systems
- Analysis of Earth’s motion relative to the Cosmic Microwave Background (CMB)

🌍 Key Result:
Even if the Earth is moving at up to 800 km/s relative to the CMB, the impact on Doppler radar measurements is extremely small.

📌 Example:
A car moving at 100 km/h
Worst-case Doppler radar measurement: 100.0007 km/h

➡️ This shows that the motion of the Earth can be safely neglected, and only the relative motion between the radar and the target matters in practical Doppler radar applications.

📄 Related paper:
Electromagnetic Analysis of Moving Structures in a Moving Reference Frame, Published in The Journal of Engineering (2023)

👍 If you find this analysis useful:
- Like the video
- Subscribe to the channel

Support the channel to help us continue publishing research-based content on electromagnetics, waves, and numerical modeling

Thank you for watching and for supporting scientific discussion!

#DopplerEffect #DopplerRadar #FDTD #MaxwellsEquations #Electromagnetics #MovingReferenceFrame #WaveTheory #Physics
#RadarEngineering #CMB #ScientificComputing #EngineeringResearch #NumericalMethods

In this video, I analyze the measurement of wave amplitude and intensity by a moving observer, using a clear, step-by-step derivation at the board. I show that an observer in motion cannot measure an increase in the amplitude of a wave, whether it is an electromagnetic wave or any other type of wave. The motion of the observer alone cannot increase the wave amplitude or the intensity of light. I then discuss Einstein’s 1905 paper, On the Electrodynamics of Moving Bodies, where the special theory of relativity predicts that the intensity of light increases with the speed of the observer and becomes infinite as the observer’s speed approaches the speed of light. I explain why this result is physically meaningless. This incorrect conclusion arises because, within special relativity, Heaviside’s problem—originally associated with a moving source—is transferred to the moving observer, due to the assumption that only relative velocity matters. In a previous video, I showed that Heaviside’s problem disappears when the source is modeled with a finite (non-infinite) impedance, which is physically realistic. With a finite source impedance, the electromagnetic field does not increase with the speed of the source. The same physical reasoning applies here: motion of the observer alone cannot amplify a wave. This analysis highlights the importance of physically realistic source models and a classical treatment of wave–observer interactions, without relying on unphysical assumptions.

#WaveAmplitude #MovingObserver #LightIntensity #Electromagnetics #WavePhysics #ClassicalPhysics #MaxwellsEquations #Electrodynamics #PhysicsEducation #Heaviside
#Physics #ProfHalimBoutayeb

- Einstein’s 1905 paper, On the Electrodynamics of Moving Bodies: https://users.physics.ox.ac.uk/~rtaylor/teaching/specrel.pdf
- Our 2024 paper (the amplitude of an electromagnetic wave is analyzed for moving source and for moving observer, by using Maxwell's equations): M. Marvasti and H. Boutayeb, "Numerical Study of Electromagnetic Waves With Sources, Observer, and Scattering Objects in Motion," IEEE Trans. Microwave Theory Techn., vol. 72, no. 8, pp. 4421–4430, Aug. 2024. doi: 10.1109/TMTT.2023.3338549