Mutual coupling suppression in microstrip lines using metamaterial on Low Temperature Co-fire Ceramic (LTCC) substrate

This paper introduces a mutual coupling-reduction scheme for high-density circuits within aptotic volumes that allows adjacent lines operating at the same frequency band to lie closer. We address a specific case of transmission line coupling that occurs when the lines carry the same signals, as in a densely antenna array feeding network. The transmission line couple mode is equivalent to a symmetrical four-port network. This network can be analyzed by the even and odd modes method described by Reed and Wheeler. Metametarial resonators consisted of metal microstructures are symmetrically embedded in substrate between two transmission lines. The results show that mutual coupling can be reduced prominently.