Designing with Simulation Results for Magnetically-/Electrically-tunable Dual-band and Triple-band Microwave Filters

In this paper, a magnetically as well as electrically tunable dual-band and also, a triple-band filter, with high rejection depth are proposed using a microstrip line which can be loaded with two/three optimally coupled square-shaped but different sized split ring resonators. The split-ring resonators, each having a single split-gap in middle to one vertical arm of the resonator (with respect to microstrip line), are placed successively on opposite sides of the microstrip line. So, the centre-to-centre distance between the resonators along the strip line is the sum of half of side-lengths of the rings.