This technology is a sub-wavelength ultra-wideband bandstop filter that utilizes the zeroth-order resonance mode of a duality CRLH-type metamaterial transmission line to provide wide-band rejection across X, Ku, and Ka bands. It features a configuration combining upper and lower bypass lines with varying widths and electrical lengths, an irregular interdigital structure with concentrated overlapping fingers at the bottom, and stepped impedance.
Conventional low-pass noise suppression filters based on transmission line theory suffer from increased overall length and degraded skirt characteristics as the required order increases. Expanding the stopband typically requires connecting multiple resonators, which leads to higher insertion loss and the generation of unwanted harmonics in adjacent bands.
This technology creates a wide stopband through strong interdigital coupling and compensates for insufficient inductance using stepped impedance with varying lengths and impedances for each branch, reducing the size to a sub-wavelength level compared to half-wavelength resonance methods. Since each resonator and the entire filter share the same electric field direction, it offers excellent frequency selectivity and skirt characteristics. It can be applied to the front-end of UWB transceivers to filter out interference signals in satellite and radar bands with a small footprint.
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