Bandstop Filter Using Slow-wave CPW Resonator with Defected Ground Structure

Progress in Electromagnetics Research Symposium (PIERS 2009 Moscow) -- AUG 12-21, 2009 -- Moscow, RUSSIAWOS: 000276497300098A novel slow-wave CPW resonator with defected ground structures (DGSs) in rectangular spacing-like shapes is investigated. This structure has an extremely compact size. Simulations and experimental results have verified that the structure provides a size reduction of about 33% against a conventional CPW resonator. Two bandstop filter examples are demonstrated. The bandstop filter realized with a fractional 20-dB bandwidth of 25% at 1.575 GHz includes a slow-wave CPW with DGS loaded periodically by four spiral-shaped resonators.Moscow State Inst Radio Engn, Elect & Automat, Russian New Univ, NVK, VIST, Russian Fdn Basic Res, Russian Acad Sci, Sci Res Inst Automat Equipment na acad VS Semenihina, VIMPEL Interstate Corp, Zhejiang Univ, Zhejiang Univ, Electromagnet Acad, MIT Ctr Electromagnet Theory & Applicat, Res Lab Elect, Electromagnet Aca