A Metasurface-Based Dual Band Stop Filter with High Angular Stability for ISM Band Applications
摘要
The proposed work introduces a metasurface-based dual band stop filter having very high attenuation; thus making it suitable for wearable biomedical applications. The use of jeans substrate makes the structure perfectly wearable and suitable for biomedical applications. Each unit cell in the proposed structure comprises of an outer metallic strip and inner novel double dumbbell shaped resonators. Each unit cell has a dimension of 0.24λ0 × 0.24λ0 with a thickness of 0.002λ0 making it quite small and size efficient. The first stop band from this design is realized at exactly 2.45 GHz while the second stop band is achieved at 5.74 GHz with an attenuation greater than 30 dB at both the bands. To comprehend the reflection and transmission phenomena better, the surface current distribution on the patches is also examined. The study of the electric field distributions at the two bands reveals the roles of the patches used in the unit cell design. The structure has also been found to be angularly stable up to 75⁰ incidence.