Tunable High-Performance Metamaterial Filters Based on Novel SRR Architectures

Metamaterials, known for their unique electromagnetic properties and lightweight design, are ideal for applications requiring high electromagnetic interference resistance and enhanced maneuverability. This study designed and fabricated four novel tunable passband metamaterial filters with ultra-thin ceramic substrates, combining both simulation and experimental approaches. The SM-2 model achieves over 97% electromagnetic wave transmittance, with surface reflectance below 0.017% at its resonant frequency, while maintaining a relative thickness of just 0.06 λ_L. Furthermore, by adjusting the unit cell geometry, SM-1 demonstrates a passband coverage of nearly 70%. Simulations identify two distinct filtering mechanisms: one driven by capacitive gain from local field superposition and the other by capacitive-inductive impedance matching, both of which enable efficient, low-loss transmission of electromagnetic energy. These metamaterials hold great potential for precise signal transmission and enhanced mobility in lightweight systems, making them promising candidates for advanced electromagnetic filtering systems.