2101340 (2 of 9) www.advopticalmat.de Figure 6. Comparisons of simulated and measured E-field distributions of E obj2 from port 2, including copolarized RHCP and cross-polarized LHCP radiations. Six transversal xoy-planes along the propagation path at corresponding z = 200, 250, 300, 350, 400, and 450 mm, respectively.
The spoof localized surface plasmon (LSP) has been widely investigated but mostly with fixed multipole resonances. This Letter proposes a method to generate multipole resonances by adding a slit on the metallic ring of a complementary LSP. This slit theoretically introduces two new boundary conditions and new modes. To validate this approach, complementary LSPs with and without slits at three different angular positions are theoretically analyzed and numerically simulated. To validate and demonstrate the potential application of the proposed LSP structure, a bandpass filter (BPF) in a single-layer substrate is designed and measured by exciting the LSP with a slit on the metallic ring. The measured results show that by simply adding a slit, the BPF achieves a fractional bandwidth of 42.7% (2.5 GHz), for both
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