Cobalt Tungstate Characterization Using Matryoshka‐Structure Filter

Green synthesis is a sustainable alternative to conventional material synthesis methods, minimizing environmental impact, and improving process safety. This study reports the synthesis of cobalt tungstate (CoWO ₄ ) via a green synthesis route using natural polymerizing agents derived from plant‐based (agar–agar) and animal‐based (gelatin) sources. Structural characterization is performed by X‐ray diffraction, complemented by Rietveld refinement to obtain precise crystallographic parameters. A microwave filter featuring a Matryoshka‐type fractal geometry is fabricated and utilized for the experimental evaluation of the electromagnetic response of the synthesized samples. Transmission losses are correlated with the crystalline structure of CoWO ₄ , with the aim of optimizing the material for microwave‐frequency applications. The results indicate that the stoichiometric composition and crystal structure directly influence the interaction of CoWO ₄ with electromagnetic waves, impacting transmission levels and losses at different frequencies.