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Tunable Bandstop Filter based on Cascaded Spiral Shaped Defected Ground Plane CPW

This paper presents the design and simulation of a tunable band stop filter. This paper explores the properties of a particular periodic structure for planar transmission line which is a spiral DGS CPW. In this filter, both ground planes of the CPW structure embraces spiral shape defects. There is an improvement in the slow wave effects and equivalent shunt inductance due to these spiral shapes when compared to standard CPW. From tunable resonant frequencies ranging from 26 GHz to around 30 GHz, this filter is designed to function in Ka frequency band. The switchable stop band filter is fabricated on RTI Duroid substrate with MEMS switches for tuning. A tuning range of more than 10% is shown in measured results. Additionally, periodic cascading of the unit elements and their performance comparisons through simulation is also mentioned.