A Versatile Fourier Domain Filtering Library for Diverse Applications
Yibo Wang, Zhong Chen, Andrew Shyne, Dennis Lewis · 2023
Fourier domain filtering is a commonly applied data post processing technique used in many engineering applications, e.g., time domain gating is often used to remove or isolate responses in a multiple reflective environment. Many commercial vector network analyzers (VNAs) include the gating algorithm as a “black box“ function. A user has little recourse to reprocess or further process the data once the data has been downloaded from a VNA. A versatile Fourier domain filtering library has been developed recently, giving users much more flexibility and convenience over the VNA-dependent process. It is well known that the gated results can exhibit significant “band edge effects“ due to the band limited measurement data. The new library toolset incorporates the standard edge treatment techniques often found in commercial VNAs. In addition, it includes a newly developed spectrum extension technique which improves the gated data accuracy significantly for many practical applications. The library works equally well for spatial and spectrum applications, such as for image processing and spectrum analyses in antenna measurement applications.