LibreVNA: The Open-Source Vector Network Analyzer
A Vector Network Analyzer (VNA) is an essential tool for characterizing the performance of radio frequency (RF) circuits. Traditional VNAs are expensive, bulky, and closed-source, limiting access to this technology. However, the open-source community has developed a solution: LibreVNA.
LibreVNA is an open-source VNA based on the Arduino platform. It uses a direct digital synthesis (DDS) signal generator and a fast analog-to-digital converter (ADC) to measure the reflection and transmission of RF signals. The open-source nature of LibreVNA means that anyone can contribute to its development and modify the design to suit their needs.
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RF Path |
LibreVNA was created by Jan Kärrman, a Swedish engineer, and software
developer. He wanted to create an affordable and accessible VNA for the
amateur radio community and other electronics enthusiasts. His design
uses a combination of off-the-shelf components and custom-designed PCBs
to create a compact and efficient VNA.
The LibreVNA project is
hosted on GitHub, where users can find all the necessary information to
build their own VNA. The project provides detailed documentation,
including schematics, PCB layouts, bill of materials, and assembly
instructions. The source code for the firmware and the PC software is
also available on GitHub.
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Digital Block diagram |
One of the unique features of LibreVNA
is its PC software. The software, also developed by Jan Kärrman,
provides a user-friendly interface to control the VNA and display
measurement results. The software is cross-platform, meaning it can run
on Windows, macOS, and Linux.
LibreVNA supports a frequency range
of 1 MHz to 6 GHz, with a dynamic range of up to 70 dB. It can measure
the reflection coefficient (S11) and transmission coefficient (S21) of
RF circuits. The VNA can also be used for antenna measurements, filter
design, and impedance matching.
LibreVNA has already gained a
following in the amateur radio community and has been used in various
DIY projects. Its open-source nature makes it an attractive option for
electronics enthusiasts and hobbyists who want to learn more about RF
circuits and measurement techniques.
Even though the PCB design uses Eagle, KiCAD can import Eagle files very well.
In conclusion, LibreVNA is an open-source VNA that provides an affordable and accessible option for measuring RF circuits' performance. Its user-friendly interface, cross-platform software, and detailed documentation make it easy to build and use. With its high frequency range and dynamic range, LibreVNA is an excellent tool for antenna measurements, filter design, and impedance matching. The open-source community has once again provided a solution to an expensive and exclusive technology, making it available to everyone.
Follow the project below:
LibreVNA - The Open-Source Vector Network Analyzer
