A few years ago, I acquired a box of Vaisala RS80-15G radiosondes from eBay. A radiosonde is typically attached to a helium or hydrogen balloon and released into the atmosphere. As it ascends, it measures atmospheric pressure, temperature, and humidity and transmits that data back to a ground receiving station. These observations are foundational for weather forecasting. In the Vaisala RS80-15G...
In my last post Designing and Fabricating a Microwave Microstripline Filter: From HFSS Simulation to PCB Testing, I designed, simulated and manufactured a Interdigital microstrip bandpass filter for the 5.5 GHz microwave band. One common issue with microwave filters designed for a specific frequency is the presence of spurious out-of-band responses, often occurring at harmonic frequencies...
Microstripline filters are essential components in RF and microwave circuits, offering a compact and efficient way to shape frequency response. In this post, we’ll walk through the complete process of designing, simulating, fabricating, and testing a microstripline filter. Starting with electromagnetic simulations in Ansys HFSS, we’ll validate the design before exporting it to KiCad for PCB...