A Study on Equivalent Circuit of Highly Isolated Coupled Microstrip Line Employing PGS on GaAs MMIC

摘要

In this work, equivalent circuit of highly isolated coupled microstrip line employing periodic ground structure (PGS) were investigated using theoretical analysis. Equivalent circuits for the PGS cell were extracted, and all lumped circuit parameters were expressed by closed-form equation. The high isolation characteristic was originated form a resonance between adjacent microstrip lines employing PGS. According to results, a much better isolation characteristic was observed from the adjacent microstrip lines employing PGS compared with conventional microstrip lines. Microstrip lines employing PGS are very useful for application to compact signal lines of highly integrated MMIC.