Low-Loss Compact SIW Filters with Shielded Complementary Split-Ring Resonator

This paper proposes two novel low-loss compact filters by stacking two substrate-integrated waveguide (SIW) cavities vertically and incorporating a complementary spilt-ring resonator (CSRR) in-between. These filters feature a completely shielded structure with the CSRR etched on middle metal surface. Wide stopband rejection is achieved owing to the combination of different resonators. The working ...