Two wideband left-handed (LH) transmission lines are presented. A pure LH transmission line (PLH TL) materialized by a defected ground structure with an inter-digital capacitor on a microstrip line has a wide LH propagation region without a right-handed (RH) branch in the reduced Brillouin zone. Another is a broadband LH rectangular waveguide utilized by a shorted stub and twisted Eplane posts....

Coupling phenomena between artificial left-handed ~LH! transmission lines are explored on the basis of a transmission line approach of LH materials. A LH forward coupler in the form of an ideal lumped-element ladder network is presented and is shown to exhibit strong forward coupling that increases with decreasing of frequency. A quasi-lumped element microstrip implementation of a LH coupler is...

In this article, we demonstrate that in the case of a positive group velocity left-handed nonlinear (LH-NL) transmission line with series nonlinear capacitances, the spatial derivative of the voltage distribution satisfies the nonlinear Schrödinger (NLS) equation. Consequently, it will shown that a LH-NL transmission line with series varactors can be used to generate both bright and dark solito...

The composite right/left-handed (CRLH) transmission line (TL) is presented as a general TL possessing both left-handed (LH) and right-handed (RH) natures. RH materials have both positive permittivity and positive permeability, and LH materials have both negative permittivity and negative permeability. This paper aims to design and analyze nonlinear CRLH-TL transmission line loaded with resonant...

Composite transmission lines are one of the main developments in the increasingly popular field of electromagnetic metamaterials, artificial electromagnetic structures with both negative electric permittivity and magnetic permeability (Caloz & Itoh, 2005). These structures present a backward wave or left-handed (LH) propagation instead of the conventional right-handed one. The first experimenta...

Basic left-handed transmission line (LH-TL) characteristics made on PCB is an important future issue for the application of the EMC field. In this paper, possibility of a LHTL characteristic made by a folded-stepped impedance resonator (F-SIR) type is investigated experimentally and theoretically as a first time. The calculations by FDTD and/or FEM (HFSS) show the usability of the LH-TL. The ex...

This thesis work focuses mostly on investigating different potential applications of meta-transmission line (TL), particularly composite right/left handed (CRLH) TL and analyzing the new phenomena and applications of meta-TL, mostly left-handed (LH) TL, on other realization principle. The fundamental electromagnetic properties of propagation in the presence of left-handed material, such as the ...

We investigate left-handed (LH) travelling-wave fieldeffect transistors (TWFETs) to observe the reverse Doppler effect. Due to the nonlinearity, a TWFET can support shock fronts that can reflect incoming waves. By introducing the composite right/left-handed line structure to a TWFET, it enables to support LH waves. Because the shock front functions as a moving reflection wall to the incoming LH...