Numerical studies of bandwidth of parallel-plate cut-off realised by a bed of nails, corrugations and mushroom-type electromagnetic bandgap for use in gap waveguides

Untilted Narrow-Wall Slots Excited by Parasitic Dipoles in Groove Gap Waveguide Technology

“…3a. As for the dimensions of the bed of nails, the interesting fact is that a wide range of values can provide the high-impedance condition required for the working band [7]. As a rule of thumb, nails must be around of a quarter of a wavelength in height with a periodicity ranging from λ/4 to λ/2.…”

Metasurfing since 1987 - a personal story involving soft and hard surfaces, EBG surfaces, cloaking, gap waveguides and mass production

“…However, the stopband of the parallel-plate waves in the gap is very different from and much larger than the bandwidth of the PMC itself. Therefore, the dispersion diagrams of the gapwaves are determined by this stopband [19]. The gap waveguide technology is in particular applicable for solving the problem of electronic packaging at millimeterwaves: of passive devices [20], filters [22], RF front-ends and MMICs [23].…”

Investigation of a Microstrip-to-Ridge Gap Waveguide transition by electromagnetic coupling

“…The textured surface is a periodic structure which behaves as an Artificial Magnetic Conductor (AMC) when it is separated a distance smaller than λ/4 from the smooth metal plate. The AMC emulates artificially the behavior of the Perfect Magnetic Conductor (PMC) in a certain frequency range (called stop band or cut-off bandwidth [6]). A local Quasi-TEM mode is allowed to propagate through a metal ridge, strip or groove located in the middle of the periodic structure [2].…”