Abstract
This paper adumbrates a novel tunable metamaterial consisting of triangular split ring resonator (TSRR) and wire strip (WS) at THz frequency. Ansoft high frequency structure simulator (HFSS) has been used to design and analyse the metamaterial having Rogers RT/duroid 5870 (εr = 2.33) and FR4 (εr = 4.4) as substrate material. Nicolson Ross Weir (NRW) method has been used to retrieve the material parameters from transmission and reflection coefficient. 4% maximization has been obtained in the location of the negative region (or resonance frequency for permeability) by using FR4 with 0.75 μm instead of 1.25 μm as substrate thickness. In addition, 18% minimization has been achieved by using FR4 with 0.25 μm instead of RT/duroid 5870 substrate with the same thickness. Tunability has been proved by showing dependence of resonant frequency over the substrate thickness and substrate material.
Highlights
“Metamaterials” (MTMs) are engineered to modify the bulk permeability and/or permittivity of the medium
Ansoft high frequency structure simulator (HFSS) has been used to simulate the unit cell designed in Figure 5(a) having metamaterial in the dielectric substrate bounded by box on either side having air as material and radiation boundary
Each configuration is placed in a two-port waveguide formed by a pair of both perfect electric conductor (PEC) and perfect magnetic conductor (PMC) walls
Summary
“Metamaterials” (MTMs) are engineered to modify the bulk permeability and/or permittivity of the medium It is realized by placing periodically structures that alter the material parameters, with elements of size less than the wavelength of the incoming electromagnetic wave. It was observed that increasing the number of layers decreased the phase of transmitted EM wave at LH frequency region All electronically switchable THz MTM devices are hybrid of schottky diode structure and eSRR array, where it is necessary to connect all eSRRs together serving as schottky contact It proved that there is neither a shift of resonance frequency nor a change of resonance strength of eSRR by connecting wires. It showed that where dispersion curves of waveguide modes and evanescent field cross, a waveguide mode is excited
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