A novel patch-via-stripline resonator for coplanar waveguide (CPW) is proposed, which exhibits wide stopband property. Combine the proposed structure with CPW defected ground structure (DGS), a novel wide stopband CPW lowpass filter (LPF) is designed. Its excellent lowpass property is verified by both simulated and measured results. This designed LPF has advantages of wide stopband, compact size, low cost and easy fabrication.
A novel highly selective six-pole elliptic filter based on a substrate integrated waveguide (SIW) is proposed for the first time. The filter is composed of two planar SIW extend doublets. The modular design approach based on cascading small building blocks is adopted to reduce the effect of manufacturing tolerance on the performance of the filter. The proposed filter can produce four finite transmission zeros, and has an excellent stopband rejection characteristic. Measured results are presented and compared with results simulated by a high frequency structure simulator. Good agreement between simulated and measured results is observed.Introduction: The rapid development of microwave and millimetrewave communication systems has greatly stimulated the demand for high performance microwave filters with compact size and low cost. Elliptic and pseudoelliptic filters offer optimal solutions to the filtering structure, having sharp cutoff skirts and low in-band insertion loss. Although canonical folded coupling schemes, possibly with additional diagonal coupling, to implement an elliptic and pseudoelliptic filter of arbitrary orders and with arbitrary positioned transmission zeros are known, they tend to be too sensitive to manufacturing tolerances, especially for high-order filters. Recently, a modular design approach based on cascading small building blocks has been proposed and tested, which can reduced the effect of manufacturing tolerance on the performance of elliptic and pseudoelliptic filters [1 -3].
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