Subwavelength Meta-Waveguide Filters and Meta-Ports
Maliheh Khatibi Moghaddam, Romain Fleury

TL;DR
This paper introduces ultra-compact, subwavelength waveguide filters using locally resonant metamaterials, demonstrating customizable bandwidths and compatibility with standard interfaces, suitable for satellite and 5G applications.
Contribution
It presents a novel design of miniaturized waveguide filters based on subwavelength resonant metamaterials and introduces a unique method for matching these filters to standard waveguide interfaces.
Findings
Demonstrated sub-lambda mode with customizable bandwidths
Built and tested Ku-band prototypes showing size reduction
Prototypes are compatible with standard waveguide interfaces
Abstract
This paper proposes a novel technique for the design of miniaturized waveguide filters based on locally resonant metamaterials (LRMs). We implement ultra-small metamaterial filters (Meta-filters) by exploiting a subwavelength (sub-lambda guiding mechanism in evanescent hollow waveguides, which are loaded by small resonators. In particular, we use composite pin-pipe waveguides (CPPWs) built from a hollow metallic pipe loaded by a set of resonant pins, which are spaced by deep subwavelength distances. We demonstrate that in such structures, multiple resonant scattering nucleates a sub-lambda mode with a customizable bandwidth below the induced hybridization bandgap (HBG) of the LRM. The sub-lambda guided mode and the HBG, respectively, induce pass- and rejection- bands in a finite-length CPPW, creating a filter whose main properties are largely decoupled from the specific arrangement of…
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