Abstract
In this paper, a quasi-elliptic bandpass fllter was designed, simulated, and fabricated using four-pole cross-coupled stepped impedance resonators (SIR). Using a special type of stepped impedance resonators, a great increase in rejection band width of the fllter was obtained. In order to perform the mentioned design practically, we utilized a compound sandwich model of two substrates (in strip line form). Furthermore, we used Defected Ground Structure (DGS) in order to omit the flrst spurious resonant frequency and increase bandwidth of the fllter. The fabricated sample was measured, and the results showed a good agreement with simulated results.
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