Embodiment of the present disclosure provides a slow wave structure of a traveling wave tube. The structure comprises a bottom plate and a top plate placed apart at a predefined distance. The bottom plate and the top plate form a rectangular structure. The structure also comprises a plurality of dielectric substrates, wherein a pair of the plurality of dielectric substrate is mounted on the metal bottom plate and metal top plate towards each other. Further, the structure comprises a plurality of meander lines slow wave structures (ML-SWS), each of the ML-SWS is mounted on the dielectric substrate on the bottom plate and top plates in contra coupled direction. The ML-SWS’s are placed on the contra coupled direction for passage of electron beam and achieving optimized bandwidths.
