High dip insertion loss due to periodic defect structure in high speed transmission line

Abstract

Periodic impedance caused by periodic structure in transmission lines is simulated by high frequency 3-D EM simulators and RF/MMW circuit simulator. From the simulated data, the dip trend of insertion loss, which is also called as suck-out effect of high speed bulk cable, is presented. A simplified N-section LC lumped-circuit model with periodic circuit elements interpreting the periodic structure of transmission line is proposed for describing the dip trend, suck-out effect, of insertion loss. With proper number of sections, under the condition of quasi-static, the lumped circuit model could also perform the suck-out effect due to the periodic structure up to several tens GHz frequency range.