Differential transmission lines on silicon based on periodic photonic bandgap structures

Differential transmission lines (DTL) can be synthesized by identical or different periodic structures (PS). These PS can be used not only for matching one circuit to another; also small resonators can be established serving in filters or oscillators. These new DTL - by using the proposed PS - allow characteristic impedances beyond that of classical TL and in addition at much smaller size. It is the first time that DTL structures form a real alternative for applications in MMIC design below 10 GHz.