Abstract
Abstract In this present paper, an investigation is conducted on a dual-band waveguide with independently controllable band-notched characteristics. The proposed slot structure, featuring a loaded gap, facilitates the operation of the plasmonic waveguide at two distinct frequency bands. Moreover, the working bandwidth of the waveguide can be flexibly adjusted through the use of varactors loaded across the gap. Notably, the dual band can be adjusted independently and flexibly by regulating the varactors. The measurement results demonstrate that the plasmonic filtering waveguide possesses excellent frequency selectivity and compact physical size, particularly concerning its real-time controllable notched-band response with the varactor voltages.
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