Design and Implementation of High-Order Stripline Filters Tailored for Wideband Multi-Channel Digital Readout Systems

Radio and mm-wavelength astronomical instrumentation systems require anti-aliasing and band-defining filters with sharp band edges, high reproducibility, low thermal variability, and low susceptibility to radiofrequency (RF) interference. As large-scale deployments involving thousands of RF channels become more common, there is an increasing need for filter solutions that balance technical performance, scalability, and cost-efficiency. In this work, we present a practical framework for the design and implementation of high order stripline filters tailored for wideband digital readout systems. Emphasis is placed on achieving low unit-to-unit variation ([Formula: see text] on frequency response metrics), steep roll-off ([Formula: see text] [Formula: see text]dB/GHz), high stopband isolation ([Formula: see text] [Formula: see text]dB), minimal in-band ripple ([Formula: see text] [Formula: see text]dB), and environmental stability (thermal drift [Formula: see text]% across 0–115 ∘ C). These performance targets are realized specifically in stripline filters, which rely on an embedded layout structure, material selection, and electromagnetic shielding. While these filters are complex to design, for low production runs, their precision and process uniformity make them ideal for scalable batch fabrication. Case studies from radio astronomy applications validate the proposed approach against demanding real-world requirements, demonstrating that the combination of careful material stack-up and repeatable design methodology support scalable deployment of high-order filters for next-generation radio telescopes.