Browsing by UPNA Author "Orazbayev, Bakhtiyar"
Now showing items 1-20 of 20
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77-GHz high-gain bull’s-eye antenna with sinusoidal profile
Beaskoetxea Gartzia, Unai
; Pacheco-Peña, Víctor ; Orazbayev, Bakhtiyar ; Akalin, Tahsin; Maci, Stefano; Navarro Cía, Miguel (IEEE, 2015)
Artículo / Artikulua 
A high-gain Bull’s-Eye leaky-wave horn antenna working at 77 GHz with sinusoidal profile has been designed, fabricated, and experimentally measured. The influence of the number of periods on the gain and beamwidth is ... -
Advanced metamaterials for high resolution focusing and invisibility cloaks
Orazbayev, Bakhtiyar (2016)
Tesis doctoral / Doktoretza tesia
Los metamateriales, descendientes de los dieléctricos artificiales, tienen parámetros electromagnéticos inusuales y proporcionan más posibilidades que los dieléctricos naturales para el control de la propagación de la luz. ... -
All-metallic ε-near-zero (ENZ) lens based on ultra-narrow hollow rectangular waveguides: experimental results
Orazbayev, Bakhtiyar ; Torres Landívar, Víctor ; Pacheco-Peña, Víctor ; Falcone Lanas, Francisco Javier ; Teniente Vallinas, Jorge ; Beruete Díaz, Miguel ; Sorolla Ayza, Mario ; Navarro Cía, Miguel ; Engheta, Nader (IEEE, 2014)
Contribución a congreso / Biltzarrerako ekarpena
Here we perform numerical and experimental investigation of plano-concave all-metallic ε-near-zero (ENZ) lens with operational frequency f = 144 GHz. The ENZ lens is achieved by stacking an array of narrow hollow rectangular ... -
Diffusive-light invisibility cloak for transient illumination
Orazbayev, Bakhtiyar ; Beruete Díaz, Miguel ; Martínez, Alejandro; García Meca, Carlos (American Physical Society, 2016)
Artículo / Artikulua
Invisibility in a diffusive-light-scattering medium has been recently demonstrated by employing a scattering-cancellation core-shell cloak. Unlike nondiffusive cloaks, such a device can be simultaneously macroscopic, ... -
Experimental demonstration of a millimeter-wave metallic ENZ lens based on the energy squeezing principle
Torres Landívar, Víctor; Orazbayev, Bakhtiyar ; Pacheco-Peña, Víctor ; Teniente Vallinas, Jorge ; Beruete Díaz, Miguel ; Navarro Cía, Miguel ; Sorolla Ayza, Mario (IEEE, 2015)
Artículo / Artikulua
The performance of an epsilon-near zero (ENZ) plano-concave lens is experimentally demonstrated and verified at the D-band of the millimeter-waves. The lens is comprised of an array of narrow metallic waveguides near cut-off ... -
Experimental demonstration of metasurface-based ultrathin carpet cloaks for millimetre waves
Orazbayev, Bakhtiyar ; Mohammadi Estakhri, Nasim; Alù, Andrea; Beruete Díaz, Miguel (Wiley, 2016)
Artículo / Artikulua
A metasurface carpet cloak for millimeter-wave range with polarization-independent performance is experimentally demonstrated. It is shown that the cloak is able to mimic the ground plane by fully restoring the amplitude ... -
Exploiting the dispersion of the double-negative-index fishnet metamaterial to create a broadband low-profile metallic lens
Orazbayev, Bakhtiyar ; Pacheco-Peña, Víctor ; Beruete Díaz, Miguel ; Navarro Cía, Miguel (Optical Society of America, 2015)
Artículo / Artikulua
Metamaterial lenses with close values of permittivity and permeability usually display low reflection losses at the expense of narrow single frequency operation. Here, a broadband low-profile lens is designed by exploiting ... -
Mechanical 144GHz beam steering with all-metallic epsilon-near-zero lens antenna
Pacheco-Peña, Víctor ; Torres Landívar, Víctor ; Orazbayev, Bakhtiyar ; Beruete Díaz, Miguel ; Navarro Cía, Miguel ; Sorolla Ayza, Mario ; Engheta, Nader (AIP Publishing, 2014)
Artículo / Artikulua
An all-metallic steerable beam antenna composed of an ε-near-zero (ENZ) metamaterial lens is experimentally demonstrated at 144 GHz (λ0 = 2.083 mm). The ENZ lens is realized by an array of narrow hollow rectangular waveguides ... -
Metasurface-based ultrathin carpet cloaks for millimeter waves
Orazbayev, Bakhtiyar ; Mohammadi Estakhri, Nasim; Alù, Andrea; Beruete Díaz, Miguel (2017)
Artículo / Artikulua
A metasurface carpet cloak for millimetre-wave range with polarization independent performance is experimentally demonstrated. It is shown that the cloak is able to mimic the ground plane by fully restoring the amplitude ... -
Soret fishnet metalens antenna
Orazbayev, Bakhtiyar ; Beruete Díaz, Miguel ; Pacheco-Peña, Víctor ; Crespo López, Gonzalo ; Teniente Vallinas, Jorge ; Navarro Cía, Miguel (Springer Nature, 2015)
Artículo / Artikulua
At the expense of frequency narrowing, binary amplitude-only diffractive optical elements emulate refractive lenses without the need of large profiles. Unfortunately, they also present larger Fresnel reflection loss ... -
Terahertz carpet cloak based on a ring resonator metasurface
Orazbayev, Bakhtiyar ; Mohammadi Estakhri, Nasim; Beruete Díaz, Miguel ; Alù, Andrea (American Physical Society, 2015)
Artículo / Artikulua
In this work we present the concept and design of an ultrathin (λ/22) terahertz (THz) unidirectional carpet cloak based on the local phase compensation approach enabled by gradient metasurfaces. A triangular surface bump ... -
THz tripod metasurfaces for sensing applications: from the basic, to more elaborated designs
Jáuregui López, Irati ; Orazbayev, Bakhtiyar ; Pacheco-Peña, Víctor ; Beruete Díaz, Miguel (IEEE, 2021)
Contribución a congreso / Biltzarrerako ekarpena
In this work, we propose, design, and evaluate three types of : three types of metasurfaces using tripod-shaped unit cells when working as thin-film sensing devices. The three meta-atoms of the proposed metasensors area ... -
Tripod-loop metasurfaces for terahertz-sensing applications: a comparison
Jáuregui López, Irati ; Orazbayev, Bakhtiyar ; Pacheco-Peña, Víctor ; Beruete Díaz, Miguel (MDPI, 2020)
Artículo / Artikulua
The high electric field intensity achieved on the surface of sensors based on metasurfaces (metasensors) makes them an excellent alternative for sensing applications where the volume of the sample to be identified is tiny ... -
Tunable beam steering enabled by graphene metamaterials
Orazbayev, Bakhtiyar ; Beruete Díaz, Miguel ; Khromova, Irina (Optical Society of America, 2016)
Artículo / Artikulua
We demonstrate tunable mid-infrared (MIR) beam steering devices based on multilayer graphene-dielectric metamaterials. The effective refractive index of such metamaterials can be manipulated by changing the chemical potential ... -
Ultra-compact planoconcave zoned metallic lens based on the fishnet metamaterial
Pacheco-Peña, Víctor ; Orazbayev, Bakhtiyar ; Torres Landívar, Víctor ; Beruete Díaz, Miguel ; Navarro Cía, Miguel (AIP Publishing, 2013)
Artículo / Artikulua
A 1.5λ0 -thick planoconcave zoned lens based on the fishnet metamaterial is demonstrated experimentally at millimeter wavelengths. The zoning technique applied allows a volume reduction of 60% compared to a full fishnet ... -
Ultrathin and high-efficiency Pancharatnam-Berry phase metalens for millimeter waves
Moreno-Peñarrubia, Alexia; Teniente Vallinas, Jorge ; Kuznetsov, Sergei A.; Orazbayev, Bakhtiyar ; Beruete Díaz, Miguel (AIP Publishing, 2021)
Artículo / Artikulua
Applying the Pancharatnam–Berry (PB) principle to half-wave plate (HWP) metasurfaces allows the manipulation of wavefronts along with the conversion of the handedness of circularly polarized incident waves by simply rotating ... -
Wideband backscattering reduction at terahertz using compound reflection grating
Orazbayev, Bakhtiyar ; Rodríguez Ulibarri, Pablo ; Beruete Díaz, Miguel (Optical Society of America, 2017)
Artículo / Artikulua
Backscattering reduction is usually achieved by using either absorbers or diffractions gratings at the expense of a narrow bandwidth. In this paper, we propose a different strategy based on a metallic compound reflection ... -
Wood zone plate fishnet metalens
Orazbayev, Bakhtiyar ; Beruete Díaz, Miguel ; Navarro Cía, Miguel (EDP Sciences, 2015)
Artículo / Artikulua
Fresnel-zone plate lenses provide focusing performance while having low profile. Unfortunately, they usually display higher reflection losses than conventional dielectric lenses. Here, we demonstrate a low-profile Wood ... -
Zoned fishnet lens antenna with reference phase for side lobe reduction
Pacheco-Peña, Víctor ; Navarro Cía, Miguel ; Orazbayev, Bakhtiyar ; Minin, Igor V.; Minin, Oleg V.; Beruete Díaz, Miguel (IEEE, 2015)
Artículo / Artikulua
Reduction of first side lobe level and nulls in artificial fishnet metalenses is accomplished here by applying the reference phase concept along with the zoning technique. Higher focusing efficiency is achieved for a ... -
Zoned near-zero refractive index fishnet lens antenna: steering millimeter waves
Pacheco-Peña, Víctor ; Orazbayev, Bakhtiyar ; Beaskoetxea Gartzia, Unai ; Beruete Díaz, Miguel ; Navarro Cía, Miguel (AIP Publishing, 2014)
Artículo / Artikulua
A zoned fishnet metamaterial lens is designed, fabricated, and experimentally demonstrated at millimeter wavelengths to work as a negative near-zero refractive index lens suitable for compact lens antenna configurations. ...
