BW media—media with negative parameters, capable of supporting backward waves

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An idea for thin subwavelength cavity resonators using metamaterials with negative permittivity and permeability (2002, background): “have been suggested such as “left-handed” media [17]–[22], media with negative refractive index [17]–[22] “backward media” (BW media) [24], “double negative metamaterials” [25], [26], to name a few.”
A Study of Using Metamaterials as Antenna Substrate to Enhance Gain (2005, background): “waves propagation [ 12 ], waveguides [13, 14], Cerenkov radiation [15], resonators [16], etc.”
Guided modes in a waveguide filled with a pair of single-negative (SNG), double-negative (DNG), and/or double-positive (DPS) layers (2004, neutral): “interface of the DPS and DNG half-spaces described in [19] and [41].”
A positive future for double-negative metamaterials (2005, background): “…double-negative (DNG) materials [12], [13] (also known as LH medium [1], negative-index materials (NIMs) [14], [15], backward-wave media (BW) [16], and negative-phase-velocity (NPV) media [17], [18] to name a few); electromagnetic bandgap (EBG) structured materials, and complex surfaces…”
Negative refraction in indefinite media (2004, background): “The sign of Eq. ( 14 ) determines which of the calculated solutions propagates toward the interface and which propagates away from the interface.”