Abstract
In this paper, we present two novel dual-band bandpass filters based on surface plasmon polariton-like (SPP-like) propagation induced by structural dispersion of substrate integrated waveguide (SIW). Both filters are realized as a three-layer SIW where each layer represents a sub-SIW structure with intrinsic effective permittivity that depends on its width and filling dielectric material. The layers are designed to have effective permittivities of opposite signs in certain frequency ranges, which enables SPP-like propagation to occur at their interfaces. Since three layers can provide two distinct SPP-like propagations, the filters exhibit dual-band behaviour. A detailed theoretical and numerical analysis and numerical optimization have been used to design the filters, which were afterwards fabricated using standard printed circuit board technology. The independent choice of geometrical parameters of sub-SIWs and/or the corresponding dielectric materials provide a great freedom to arbitrarily position the passbands in the spectrum, which is a significant advantage of the proposed filters. At the same time, they meet the requirements for low-cost low-profile configuration since they are realized as SIW structures, as well as for excellent in-band characteristics and selectivity which is confirmed by the measurement results.
Highlights
The advantageous properties of SPPs such as slow-wave behaviour and field confinement are very desirable in frequency regimes other than optical since they open up possibilities for significant improvement of components and devices
If a parallel-plate waveguide is divided into two parts by an array of wires placed along the plane normal to the plates, and if the parts are filled with different materials, the two parts exhibit effective permittivities of opposite signs in a certain frequency range, BioSense Institute—Research Institute for Information Technologies in Biosystems, University of Novi Sad, Dr Zorana Djindjica 1a, 21101, Novi Sad, Serbia
The proposed filters are realized as a microstrip-fed three-layer substrate integrated waveguide (SIW) where each layer represents a sub-SIW structure with intrinsic structural dispersion depending on its geometry and dielectric material
Summary
The advantageous properties of SPPs such as slow-wave behaviour and field confinement are very desirable in frequency regimes other than optical since they open up possibilities for significant improvement of components and devices. Which allows for SPP to occur at their interface This methodology was applied in somewhat different waveguide structure - substrate integrated waveguide (SIW), and the realized configuration demonstrated potential for filtering applications at microwave frequencies[34]. It is well-known that the rapid growth of communication systems imposes the requirements for high-performance, low-cost, low-profile components that operate at two or more non-harmonically related frequencies. Since the layers are designed to have effective permittivities of opposite signs in certain frequency ranges, two distinct SPP-like propagations occur at the interfaces between the top and middle sub-SIWs and the middle and bottom sub-SIWs, which provides two passbands in the filters’ response
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