Cselyuszka Norbert, Sakotic Zarko, Kitic Goran, Crnojevic-Bengin Vesna, Jankovic Nikolina
BioSense Institute-Research Institute for Information Technologies in Biosystems, University of Novi Sad, Dr Zorana Djindjica 1a, 21101, Novi Sad, Serbia.
Sci Rep. 2018 May 29;8(1):8332. doi: 10.1038/s41598-018-26705-w.
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.
在本文中，我们展示了两种基于衬底集成波导（SIW）结构色散所诱导的类表面等离激元极化激元（SPP-like）传播的新型双带通滤波器。这两种滤波器均实现为三层SIW结构，其中每一层都代表一个具有本征有效介电常数的子SIW结构，该有效介电常数取决于其宽度和填充的介电材料。这些层被设计为在特定频率范围内具有相反符号的有效介电常数，这使得类SPP传播能够在它们的界面处发生。由于三层可以提供两种不同的类SPP传播，因此这些滤波器呈现出双带行为。我们使用了详细的理论和数值分析以及数值优化来设计这些滤波器，随后使用标准印刷电路板技术进行制造。子SIW的几何参数和/或相应介电材料的独立选择为在频谱中任意定位通带提供了极大的自由度，这是所提出滤波器的一个显著优势。同时，由于它们被实现为SIW结构，它们满足低成本低剖面配置的要求，以及具有优异的带内特性和选择性，测量结果证实了这一点。
