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DIY 10MHz-15GHz VNA: Outperforming Cheap Commercial Models

2025-04-15
DIY 10MHz-15GHz VNA: Outperforming Cheap Commercial Models

The author designed and built a 10MHz-15GHz vector network analyzer (VNA) that outperforms all existing low-cost VNAs. This four-receiver VNA supports advanced calibration methods like unknown-thru calibration and boasts over 120dB isolation. The article details the design process, covering architecture, directional couplers, receiver, ADC, FPGA, PCB design, and CNC-machined enclosure. Testing demonstrates excellent measurement accuracy and stability, accurately characterizing devices like bandpass filters and varactor diodes. While couplers require manual assembly, the total component cost is around $300 (excluding taxes and shipping), showcasing exceptional value.

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(hforsten.com)
Hardware Vector Network Analyzer Hardware Design High-Frequency Measurement

DIY Drone-Borne SAR: 1.5km Imaging on a Budget

2025-02-17

This project details the construction of a low-cost drone-borne synthetic aperture radar (SAR) system for under €800 and 10 months of spare time. The system achieves imaging up to 1.5km (and potentially further), weighs less than 1kg, and supports HH, HV, VH, and VV polarizations. The author meticulously documents the design, hardware choices, software algorithms (including a PyTorch-based autofocus algorithm), and the resulting imagery. This project showcases the potential of low-cost hardware for high-performance SAR imaging.

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(hforsten.com)
Tech Synthetic Aperture Radar Drone