Everything
is a wave.

Electromagnetic waves are what pull me in — the way they radiate, guide, and interfere. I chase them across the spectrum: microwave circuits and antennas on one side, photonics on the other. Same physics, different wavelengths.

EE undergraduate at the University of Tehran; my thesis aims those waves at non-invasive deep brain stimulation. The details live in the CV — the instruments run live in the Lab.

Hassan Keshtkar — HASSAN KESHTKAR · TEHRAN

01 Lab

Instruments I've built. They aren't screenshots — everything here runs live, in this page, offline-capable, no frameworks.

Smith Chart Studio

RF · canvas · teaching tool · 0 dependencies

A full interactive Smith chart with a built-in tutor. Drag the reflection point and watch Z, Γ, SWR and return loss stay in sync; rotate along a transmission line; flip impedance/admittance grids — then work through seven guided lessons, from “what is this chart” to L-network matching.

And if you want the story rather than the tool: Folding infinity into a circle is an essay on where the chart came from — a bored Bell Labs engineer in 1929, an infinite plane folded down to the size of a coin, and why software never managed to kill it. Seven live figures, no RF background needed.

Open in new tab ↗ Read the essay

NEXT INSTRUMENT

On the bench. This slot is reserved — the lab is never finished.

02 Writing

Long essays on the things I keep circling back to. Same rule as the Lab — every figure is live and you can break it, nothing here is a screenshot.

Folding infinity into a circle 2026

ESSAY · RF & MICROWAVE · ~15 MIN · 7 LIVE FIGURES

Almost every engineering student is a little scared of the Smith chart — it looks like a dartboard left out in the rain. It isn't hard. A bored Bell Labs engineer drew it in 1939 to stop doing the same arithmetic every day, and every radio instrument built this year still puts his circles on the screen.

The story of how an infinite plane gets folded down to the size of a coin, why the grid lines survive the fold, and why software never managed to kill it. No RF background needed — every term gets explained the first time it shows up.

Read the essay

NEXT ESSAY

Being written. Probably about waveguides, or why every antenna is secretly the same antenna.

03 Curriculum Vitae

DOC. HK-CV · REV 2026.07 · SHEET 1 OF 1

Education

B.Sc. in Electrical Engineering — University of Tehran

Faculty of Electrical & Computer Engineering · Ranked #1 in Iran, QS World University Rankings 2026

Sep 2022 – Sep 2026 (exp.)

GPA 18.05 / 20 · ranked 13^th of 128 — top 10% of cohort

Thesis: Improving Spatial Focality in Temporal Interference Deep Brain Stimulation via Phase Modulation — supervised by Prof. Hoda Ameri

SELECTED COURSES ▾

Filter & Circuit Synthesis 20
Engineering Mathematics 20
Linear Control Systems 20
Electronics II 20
Microwave I 19.8
Signals & Systems 19.74
Microwave Lab 19.54
Electric Circuits I 19
Communication Systems 18.8
Electronics I 18.5
Electromagnetics 18.26
Fields & Waves 18.1

In progress: Antenna I · Wireless Communications · Communication Circuits · EMC

Research experience

Bioelectromagnetics Laboratory — University of Tehran

Undergraduate research intern · Profs. R. Faraji-Dana, H. Ameri & A. Mataji-Kojouri

Jun 2025 – Nov 2025

Developed a non-invasive deep brain stimulation technique that targets deep neural circuits without surgical implants.
Proposed PM-TI, a phase-modulated temporal-interference method that reduces unintended stimulation spread by ≈70%, sharpening spatial focus.
Simulated electric-field distributions in biological phantoms with COMSOL Multiphysics to validate the focused hotspot.
Built a 2-channel high-precision current source (enhanced Howland architecture) to generate the stimulation signals in hardware.
Co-authored the PM-TI methodology paper, accepted at ICEE 2026.

Publications

H. Keshtkar, M. Moltamesi, H. Ameri, A. Mataji-Kojouri, R. Faraji-Dana, “Spatial Focusing of Temporal Interference Deep Brain Stimulation via Phase Modulation,” 34th Int. Conference on Electrical Engineering (ICEE), 2026. accepted — pending IEEE indexing
M. Moltamesi, H. Keshtkar, et al., “Seizure Suppression in a Neural Mass Model via Input–Output Feedback Linearization and Backstepping Control,” 34th Int. Conference on Electrical Engineering (ICEE), 2026. accepted — pending IEEE indexing

Honors & awards

Top 0.5% nationwide in Iran's university entrance exam (Konkur, Math & Physics) among 146,000+ participants — 2022.
Ranked 13^th of 128 in the electrical engineering cohort.
Exam-exempt admission to the M.Sc. program at the University of Tehran, reserved for top-ranked undergraduates.

Teaching assistant

Electromagnetics	Prof. Hoda Ameri	University of Tehran	Fall 2025
Electromagnetics	Prof. Asghar Keshtkar	Imam Khomeini Int. University	Fall 2025
Electric Circuits I	Prof. Moein Abedini	University of Tehran	Fall 2024

Skills

MATLABPythonCVerilog HDL COMSOL MultiphysicsAnsys HFSSAnsys MaxwellADSNI MultisimArduino

Languages

English — professional working proficiency
Persian — native

04 Contact

Three ports, all matched — your message won't reflect back.