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Cheng, Fei; Li, Xuan-Tan; Lu, Ping; Huang, Kama
Electronics letters, 12/2019, Letnik: 55, Številka: 25Journal Article
This Letter presents a third-order multilayer substrate integrated waveguide (SIW) filter with broadband stopband. The filter is composed of three vertically stacked square SIW cavities. The input/output feeding structure and the coupling slot in the middle metal layer of two cavities are properly designed to just allow the fundamental resonant mode to a couple while other higher spurious resonant modes are isolated. The fabricated filter is at a centre frequency of 6.96 GHz with a stopband suppression of 24 dB up to 2.77f0.
