Electromagnetic Tuesday 24. 2. 2026

Come again after a year to see an informal performance of the Department of Electromagnetic Field. In the second week of the summer semester, we are preparing for you the 8th annual Electromagnetic Tuesday event, where you can watch interesting experiments, try to build something and learn something new. And we won’t let you die of hunger or thirst either. 

This time we have the following demonstrations and experiments for you:

Engrave your own antenna
The station where you can make your own antenna is a regular feature at EMiT, and it will be there again this year. The now traditional opportunity to make your own small multi-band antenna for modern mobile devices (laptops, tablets, phones) will be enhanced this year with an interesting technical innovation. The antenna design itself will be created using a CNC milling machine for the production of printed circuit boards directly on the PCB. You will be able to measure the parameters of the final product and take it home with you… in your pocket.

Hyperthermia laboratory
To demonstrate the application of microwaves in the treatment of cancer, we will use a poster that describes the biological basis of microwave hyperthermia. Its physical principle will be explained by calculating the 3D treated area heating (with respect to time) with the EM field simulator Sim4Life. With an emphasis on the information, we must first simulate the 3D distribution of EM wave absorption and consequently the 4D temperature distribution. We will support this simulation by experimenting with microwave heating of an agar phantom and monitoring the temperature increase using an IR camera. Demonstration of IR camera (including an offer for students to make their own IR portrait).

Size matters!
You will try to solder a matching circuit from a few SMD components on a printed circuit board with an antenna. There will be several component sizes to choose from and you can test your soldering skills and dexterity. You will learn that size matters and that matching circuits must take into account the parasitic parameters of the components used. You will be able to check the resulting adjustment immediately on the available NanoVNA.

Home RF measurements
We will focus on home measurement of RF parameters using several affordable or easily home-built instruments. Specifically, we’ll be using a NanoVNA, a TinySA (pocket spectrum analyzer), a small oscilloscope, an RF current probe, a field strength meter, a power and SWR meter.
We’ll demonstrate selected basic measurements useful for “home RF tinkering,” including:
– antenna matching measurements
– measurement of coaxial cable losses, velocity factor, and fault identification
– measurement of RF power and field strength, Wi-Fi analyzer
– measurement of real components in the RF range
– oscilloscope measurement of circuits
– measurement of common-mode currents on coaxial cables (effects of asymmetric termination) and of so-called line isolators / clip-on ferrites / air-wound coaxial chokes
– measurement of antenna baluns with ratios 1:1, 1:4, and 1:49

Tones over photons
Did you know that you can receive a radio signal with an antenna and then transmit it wirelessly and over an optical fiber using a laser beam? You can tune an AM or FM radio transmission at the end of the hybrid transmission chain and verify the effect of individual parameters on the transmission quality.

Occult booth
Transforming carbon into iron using a microwave oven, measuring life energy with a wheel on a dry bearing, or looking inside a Czech harmonization device. All this awaits you in the Occult corner, where physics collapses like a house of cards.

Paper spectrum analyzer
It’s not difficult to disperse white light into a rainbow. But would you like to make a spectrum analyzer with a calibrated scale? All you need is a bit of physics knowledge, patience, and diffraction foil. And if you succeed, you can make an accessory for your camera that will also record a piece of the infrared spectrum.

And there’s more…

Photos from previous years:

EMiT 2025 – photo
EMiT 2024 – photo
EMiT 2023 – photo
EMiT 2022 – photo
EMiT 2020 – photo
EMiT 2019 – photo
EMiT 2018 – photo