Abstract
Local leaky electromagnetic (EM) waves can impact the performance of the whole systems obviously due to the compact arrangement of integrated systems, including circuits based on spoof surface plasmon polaritons (SPPs). However, the widely used metallic shielding box in the traditional EM compatibility technology will affect the propagation of SPP modes dramatically. In this letter, we propose the double-layer dielectric shielding box made by materials with high permittivity, which can reduce leaky EM waves without affecting the transmission efficiency of SPP transmission lines (TLs). We demonstrate in simulation and experiment that the dielectric-shielded SPP TLs perform better in propagation than metallic-shielded SPP TLs. The effectiveness of the dielectric shielding boxes is investigated as well, and the calculated and measured results indicate that the double-layer dielectric structure can produce outstanding shielding effectiveness.
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