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This article presents a W‐band air‐filled coaxial bandpass filter with multiple transmission zeros using micro metal additive manufacturing technology. The coaxial structure was fabricated through the electroforming of thick copper layer by layer and inner conductor of coax is supported by SU‐8 photo‐resist. The internal cross‐section size of the coaxial lines is 0.3 mm × 0.3 mm, which is very compact...
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