A method to realize epsilon-near-zero-like materials for waveguide discontinuities

Frequency-Selective Energy Tunneling in Wire-Loaded Narrow Waveguide Channels

“…1(b). The metallic wires, in such a configuration, are separated by a periodicity of T and are directed parallel to the electric (E) field [5]. The concept was inspired by the method of excitation of the waveguide cavities using probe antennas [6].…”

“…The corresponding full-wave simulations of the transmission coefficient show a resonance peak at this frequency. Hence, the waveguide system acts as a cavity whose frequency response can be tuned by simply varying the length of the wires without affecting the size of the waveguide [5].…”

Applications of wire-loaded waveguide bends and channels

“…Subsequently, many studies also focused on exploiting the dispersion characteristics of the wire-media (without the split-ring-resonators) and demonstrated interesting effects such as resonance-cone focusing and epsilon-near-zero (ENZ) tunneling in waveguide bends [3][4][5]. More recently, tunneling effects have also been demonstrated in waveguide bends that are loaded with the wire-medium [6]. Figure 1 shows one such configuration which consists of two waveguides connected through an aperture filled with the wire-medium.…”

“…The tunneling in the wire-loaded and ENZ-filled cavities is accompanied by intense electric fields and highly-selective frequency response [4,6]. Hence the concept can be applied in many useful applications such as filtering and dielectric sensing [6].…”

“…Hence the concept can be applied in many useful applications such as filtering and dielectric sensing [6]. Particularly, the wireloaded cavities offer more flexibility, ease of fabrication, and frequency scalability.…”