LibreVNA is a USB vector network analyzer with two ports and is open source. The device serves as an RF interface with some computing power, while the main processing is performed by software on a PC. LibreVNA is capable of performing 10,000 dual-port point measurements per second and has an effective dynamic range of 100dB. The analyzer board is equipped with three ADCs and an FPGA for signal processing.
With two measurement ports, the analyzer can measure the full set of reflection and transmission coefficients (S11/S12/S21/S22). Although the LibreVNA hardware is designed as a vector network analyzer, its architecture is so similar to that of a spectrum analyzer that it can also perform basic dual-channel spectrum measurements.
Features.
Covers a wide frequency range from 100kHz to 6GHz, allowing measurements at different frequencies
Measurement of SWR (VSWR) of antennas, smear diagram
Equipped with two test ports, allowing you to measure a full set of reflection and transmission coefficients (S11, S21, S12, S22)
Capable of performing up to 10,000 dual-port point measurements per second
Has an effective dynamic range of more than 95dB for frequencies up to 3GHz and more than 50dB for frequencies up to 6GHz
Built-in 3 analog-to-digital converters (ADCs) and a programmable logic gate array (FPGA)
Has an open source code
Specifications.
VNA specifications:
Frequency Range: 100kHz - 6GHz
Test ports: 2
Output power: -40dBm - 0dBm
Frequency accuracy: <2ppm
Measurement points: 2 - 4501
Measurement bandwidth: 10Hz - 50kHz
Dynamic range:
>95dB (<3GHz)
>50dB (<6GHz)
Measurement parameters: S11, S21, S12, S22
Impedance: 50Ω
Power supply: DC 5V, 1.5A (USB or 3.5mm jack)
Support: Windows, Linux, MacOS
Dimensions: 122x98x16mm
Weight: 371g
Technical characteristics of the signal generator:
Frequency range: 100kHz - 6GHz
Output power: -40dBm - 0dBm
Technical characteristics of the spectrum analyzer:
Frequency range: 100kHz - 6GHz
Input power: <-5dBm
Bandwidth resolution: 13Hz - 112kHz
Phase noise: -103dBn/Hz (1GHz, 10kHz offset)
Notes:
Since the LibreVNA analyzer is open source, there are some design limitations:
Due to some structural limitations, the isolation of S12 is 10dB worse than that of S21
Above 3GHz, the performance decreases with increasing frequency, resulting in a port isolation of only 50dB at 6GHz
Below 1MHz, performance decreases with frequency, and effective dynamic range is reduced to 70dB at 100kHz
Output power may decrease if the frequency is below 1MHz or above 3GHz
With this LibreVNA, the use of more accurate calibrators ensures higher measurement accuracy.
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