a1 Institute National de la Recherche Scientifique (INRS), University du Québec, Varennes J3X 1S2, Canada
a2 Poly-Grames and Centre for Radiofrequency Electronics Research, Ecole Polytechnique de Montréal, Montréal H3T 1J4, Canada
A novel waveguide called multilayer porous waveguide (MPW) is proposed as microwave low-loss transmission lines. MPW is a fully rectangular dielectric waveguide composed of several periodically rectangular air gaps in a bulk dielectric that can be easily formed by placing several dielectric substrates in interval with air gaps. The loss and propagating characteristics of both TE and TM modes in MPW are studied. The TE mode confined in the air gaps has a lower loss than the TM mode spread out in air gaps and dielectric; however, the loss of TM mode is still less than that of conventional microwave waveguides. Finally, MPW is an artificial material with desirable electrical permittivity and loss that can be used in structure of conventional waveguides.
(Received November 15 2010)
(Revised February 15 2011)
(Online publication May 18 2011)