Design of a novel CRLH-TL structure
2007 IEEE Antennas and Propagation International Symposium
Two new types of interdigital capacitors (IDC) are proposed to be used in a novel Composite Right/Left-Handed Transmission Line (CRLH-TL) structure. The LC parameters of the traditional and novel IDC are respectively extracted for comparisons with Ansoft HFSS9 full-wave simulation. In contrast with traditional structure, such two new IDC enhance the capacitance values dramatically by about 38.7% and 100%, respectively, compared with the traditional structure within the same size of etched area.
... ize of etched area. Also dispersion relationships are calculated by both simulation and Bloch theorem. A one dimension (1-D) CRLH-TL structure consisting of such new IDC and meandering grounded inductors is designed, modeled and simulated. The presented structure is able to operate within a much lower and wider Left-handed (LH) frequency band than traditional ones. Keywords CRLH-TL structure . LH operating frequency . Interdigital capacitors Introduction Left-handed materials (LHM), also named negative index materials (NIM) for their negative refraction index resulting from simultaneously negative real parts of electric permittivity and magnetic permeability, were firstly expected and theoretically investigated by Russian Physicist Veselago in late 1960 . Three decades later, Smith et al. fabricated the first LHM using a periodic array of split-ring resonators (SRRs) combined with an array of straight conducting wires, on the basis of Pendry's theoretical work in [3, 4] . Since then, LHM has highly attracted both scientific and engineering communities for its extraordinary characters which are not generally found in nature. In 2003, Parazzoli experimentally verified and simulated negative refraction index of LHM using Snell's Law