The behaviour of attenuation losses in CPWs is studied for quasi planar transmission lines with constant characteristic impedance (Zo) and resistivity, having different geometries. Minimisation of loss for a chosen substrate thickness, conductivity and Zo is analysed. A sensitivity analysis for effective dielectric constant with respect to gap width, strip width,dielectric constant and substrate height, is presented 157 0-7803 -3619 -4
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