Analysis of Periodic Structures Made of Pins Inside a Parallel Plate Waveguide

Abstract

In this work, we have analyzed different versions of periodic structures made with metallic pins located inside a parallel plate waveguide (PPWG), varying the symmetry and disposition of the pins. The analysis focuses on two main parameters related to wave propagation. On one hand, we have studied how the different proposed structures can create a stopband so that the parallel plate modes can be used in gap waveguide technology or filtering structures. On the other hand, we have analyzed the dispersion and equivalent refractive index of the first propagating transverse electromagnetic mode (TEM). The results show how the use of complex structures made with pins in the top and bottom plates of a PPWG have no advantages in terms of the achieved stopband size. However, for the case of the propagating mode, it is possible to find less dispersive modes and a higher range of equivalent refractive indices when using double-pin structures compared to a reference case with single pins.

On the Benefits of Glide Symmetries for Microwave Devices

“…For example, in [80] the authors proposed the use of a glide-symmetric multilayer configuration. As a final remark, the EBG properties of glide-symmetric metallic pins have also been investigated in the literature [81], including their possible use in gap waveguide technology [82].…”

Periodic Structures With Higher Symmetries: Their Applications in Electromagnetic Devices

“…Additionally, the first mode is able to produce higher refractive indexes and it is more isotropic. Although the first implementations of two-dimensional glide-symmetric structures were based on holey structures [25], similar properties were also found for glide-symmetric pins [55], [56]. This technique was employed in [57] to produce a broadband Luneburg lens antenna in the K a -band in for 5G communications.…”

Potential Use of Cold Plasma Discharges for Frequency Reconfigurability in a Sievenpiper Mushroom Metasurface

“…From this circuit, we can have the equivalent surface impedance Z s for the structure, as exposed in Equation ( 5) [1]. However, with this analysis, we cannot obtain properly the stop-band generated by this lattice: To evaluate the stop-band generated by this structure, we proceed to do an irreducible Brillouin zone analysis, from which we can retrieve its dispersion diagram and therefore the frequency range where there are no propagating modes [16,35]. This analysis is done using the software ANSYS HFSS [36], where a unit cell of the mushroom structure is implemented and analyzed.…”