Analysis and Characterization of Edge Coupled Coplanar Waveguide Discontinuities for Filter Applications

This paper presents a technique for analysis and characterization of several types of edge coupled coplanar waveguide (ECCPW) discontinuities such as ECCPW open end-capacitive, ECCPW short circuit inductive and ECCPW symmetric stepped discontinuities in center conductor at elements at 30 GHz with coupling coefficient 17dB as microwave reactive elements. The topology assumes the fact that ECCPW coupled strip with small gap is equivalent to the center conductor strip of the CPW structure. The model element values de embedded for the measured S-parameters. The results show that ECCPW discontinuities can be used successfully as reactive elements for related applications. ECCPW are widely use in realizing band pass filters in communication circuit. Open end discontinuity shows the return loss (S11) of -0.282 dB, short circuit discontinuity gives the return loss(S11) of -0.010 dB and step discontinuity return loss (S11) of -12.9 dB and S12 of -17.667 dB with coupling coefficient of -17dB. Being simple and computationally efficient, the method is suitable to deal with extensive edge coupled CPW discontinuities problems. All discontinuities structure realizing on substrate 450-μm thick GaAs with dielectric constant 12.9.

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