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Helical resonator filters with improved multipactor performance exploiting rigorous modelling and the large gap approach - Salza - 2019 - IET Microwaves, Antennas & Propagation - Wiley Online Library
RF/Microwave bandpass filter implementations, Part 3: Microstrip, coaxial, and helical filters
Figure 7 from Realization of a Filter with Helical Components * | Semantic Scholar
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Filters for RadioJove
