Two circuit modelling and parameterisation techniques for optimisation of a left-handed microstrip transmission line for antenna applications are presented. Such a transmission line is characterised by high transmission loss ripples in the required frequency band, which hinders its use as a wideband feeding network in antenna array applications. The first circuit modelling technique is based on...

We systematically examine the conditions of obtaining left-handed ~LH! behavior in photonic crystals. Detailed studies of the phase and group velocities as well as the phase np and group ng refractive indices are given. The existence of negative refraction does not guarantee the existence of negative index of refraction and so LH behavior. A wedge type of experiment is suggested, which can unam...

A novel composite right/left handed transmission line (CRLH TL) is proposed, for the first time using the Wunderlich-shaped dentiform capacitor and meandered-line short-circuited stub inductor (SSI). The CRLH TL features a larger value of CL and in turn a lower resonance relative to the previous one employing an interdigital capacitor and an SSI. The unique feature of the CRLH TL is applied to ...

Based on bionics, we design and analyze the left-handed (LH) characteristics of meta-elements with leaf-shaped structure. The double negative (DNG) frequency band initial LH structure is 5.77-6.17 GHz a fractional bandwidth 6.7%. Inspired by two overlapping leaves, based topology, evolve into line-line coupled double-leaf DNG bands are 2.96-3.86 4.14-4.18 GHz. This not only retains some radiati...

Parallel (P) and antiparallel (AP) configurations are widely applied in magnetic heterostructures have significant impacts on the spin-wave transmission magnonic devices. In present study, a theoretical investigation was conducted into of exchange-dominated spin waves with nanoscale wavelengths type heterostructure including two media, which magnetization state can be set to P configuration by ...

This paper presents the numerical modelling and simulation of a 2D vertical well tubular model excited by coaxial radiofrequency transmission line placed in its annular space for purpose downhole RF energy transmission. The study identifies mechanism losses due to coupling between steel tubing casing using resonance mode analysis. design left-handed artificial power is proposed minimize right-h...

We report terahertz metamaterial waveguides based on the concept of composite right/left-handed transmission-lines. The waveguides are implemented in a metal-insulator-metal geometry fabricated with spin-coated Benzocyclobutene and contact photolithography. Angle-resolved reflection spectroscopy shows strong resonant absorption features corresponding to both right-handed and left-handed (backwa...