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Helical filter design

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Helical filter design

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145 MHz Low Loss Bandpass Helical Filter. Basic design of the filter is from RSGB VHF-UHF Manual, but I made some modifications. Coils has 6 turns. The tuning capacitors are made from two copper or stainless steel round plates, about 31 to 32 mm in diameter each. (about 760 mm2) One must be very careful using other variable capacitors instead ...Helical Resonator Design for Filters: There is a frequency region between around 600 MHz and 1500 MHz where the self-resonant frequencies of discrete components make filter design very difficult, and where the physical dimensions of transmission lines and cavity filters are too large for practical implementation.