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Edge-coupled coplanar waveguide bandpass filter design

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1 Author(s)
Weller, T.M. ; Dept. of Electr. Eng., Univ. of South Florida, Tampa, FL, USA

This paper describes a new technique for the design of edge-coupled coplanar waveguide (CPW) bandpass filters at microwave and millimeter-wave frequencies. The topology consists of coupled-slot pairs that are symmetric about the center of the CPW line. By applying duality and symmetry, a design methodology is developed that follows the well-known coupled-strip approach. In order to provide filter design guidelines, a spectral domain integral equation analysis was used to characterize coupled slots on silicon with a range of geometrical parameters, through which a series of design curves were generated. Experimental results are given for 10-GHz filters printed on high-resistivity silicon, with bandwidths from 5% to 20%. It is shown how the manner of connecting filter sections can influence the frequency response

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:48 ,  Issue: 12 )