Wideband filters employing multilayer gratings

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Wideband filters employing multilayer gratings

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Multilayer surfaces, consisting of stacked inductive and capacitive strips or grids, have been used to design wideband filters in the 5–40 GHz range, with rapid transitions between reflection and transmission. For singly polarised applications, transmission bandwidths of 70–100% and edge transition ratios of 1.1–1.3 are realisable at 45° TM incidence using 4–8 layers of capacitive and inductive strips. Factors which constrain the passbands are highlighted. In dual polarised designs using doubly periodic grids, the widths are restricted to 35–40% by TE incidence grating responses at the upper passband edge. In TM they are even more restricted by a TE11 mode resonance. Wider passbands require high inductances to reduce the low frequency edge, implying very fine conductors.

Inspec keywords: strip line components; band-pass filters; microwave filters

Other keywords: multilayer surfaces; singly polarised applications; capacitive strips; passband edge; TE11 mode resonance; dual polarised designs; 5 to 40 GHz; doubly periodic grids; multilayer gratings; wideband filters; TE incidence; TM incidence; edge transition ratios; frequency selective surfaces; inductive strips; transmission bandwidths

Subjects: Waveguide and microwave transmission line components; Passive filters and other passive networks

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