Microwave directional filters using metamaterial closed-loop resonators.

Authors :: Lobato-Morales, H.
Corona-Chavez, A.
Rodriguez-Asomoza, J.
Source :: Microwave & Optical Technology Letters. May2009, Vol. 51 Issue 5, p1155-1156. 2p. 2 Diagrams, 3 Graphs.
Publication Year :: 2009
Abstract: The design and construction of two Metamaterial (MTM) directional filters (DF) for multiplexing applications at 900 MHz is presented. The four-port filters are realized using composite-right-left-handed (CRLH) closed-loop resonators, which present small dimensions and suppression of harmonic resonances due to the zeroth-order resonance produced by MTM's. The first filter uses two conventional transmission lines (TL) between resonators to generate the necessary constructive-destructive interference for directional behavior. The second design is further miniaturized by a CRLH TL. The simulated responses are compared with measured data showing good agreement. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1155–1156, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24275 [ABSTRACT FROM AUTHOR]