Amirkabir University of Technology

Other

Amirkabir University of Tehran

Amir Jafargholi

Parviz Parvin

Mehran Ahadi

Ali Bavali

Farzad Mokhtari

Mohsen Hashemi

Mehdi Veysi

Jun H Choi

Azadeh Niazi

Mohammad Hossein Mazaheri Kalahrudi

Jalaledin Tayebpour

Seyed Ali Dehghanian

Alireza Jahanbakhshi

Alireza Mashhadi

Ali Jafargholi

Parisa Zhalefar

Mohammad Amin Bassam

Zahra Khodabakshi

Mahmood Akbari

A system for EMNZ metamaterial-based direct antenna modulation. The system includes a signal generator, a metamaterial switch and an antenna. The signal generator may is configured to generate a microwave signal. The metamaterial switch is configured to generate a modulated microwave signal from the microwave signal. The modulated microwave signal is generated by selectively passing the microwave signal through the metamaterial switch. The metamaterial switch includes a first conductive plate and a first loaded conductive plate. The first loaded conductive plate includes a second conductive plate and a first monolayer graphene. The first monolayer graphene includes a first tunable conductivity. The first monolayer graphene is positioned between the first conductive plate and the second conductive plate. An effective permittivity of the metamaterial switch is configured to be adjusted to a predetermined value. The effective permittivity of the metamaterial switch is adjusted responsive to tuning the first tunable conductivity.

EMNZ metamaterial switch configured for antenna modulation in a switched-beam array antenna

EMNZ metamaterial switch configured for use in a phase array antenna and a leaky-wave antenna

A method for determining sucrose concentration in honey. The method includes preparing a sample of honey, stimulating the sample by emitting a first laser beam on the sample in a first stimulation direction, detecting a fluorescence spectrum from a first fluorescence emission emitted from the sample in a first detection direction, detecting a first pair of fluorescence peaks and a second pair of peak wavelengths in the fluorescence spectrum, and determining a sucrose concentration based on one of the first pair and the second pair utilizing a database. The database includes a plurality of predetermined sucrose concentrations associated with the first pair or the second pair.

Determining sucrose concentration in honey based on fluorescence spectroscopy

An epsilon-and-mu-near-zero (EMNZ) metamaterial. The EMNZ metamaterial includes a waveguide. A length l of the waveguide satisfies a length condition according to l&#x2264;0.1&#x3bb;, where &#x3bb; is an operating wavelength of the EMNZ metamaterial. The EMNZ metamaterial further includes a magneto-dielectric material deposited on a lower wall of the waveguide. The waveguide includes an impedance surface placed on the magneto-dielectric material.

EMNZ metamaterial configured into a waveguide having a length that is less than or equal to 0.1 of a wavelength

A metamaterial switch. The metamaterial switch includes a first conductive plate, a first loaded conductive plate, and a magneto-dielectric material. The first loaded conductive plate includes a second conductive plate and a first tunable impedance surface set. Each tunable impedance surface in the first tunable impedance surface set includes a respective tunable conductivity. An effective permittivity of the metamaterial switch is configured to be adjusted to a first predetermined value. The effective permittivity of the metamaterial switch is adjusted responsive to tuning a respective tunable conductivity of each respective tunable impedance surface in the first tunable impedance surface set.

EMNZ metamaterial configured to form a switch, a multiplexer, and a phase shifter

A method for optical imaging based on spectral shift assessment. The method includes generating a sample by mixing an object with a fluorophore, stimulating the sample by emitting a laser beam, extracting a plurality of fluorescence spectra from a plurality of fluorescence emissions emitted from the sample, detecting a plurality of fluorescence peaks and a plurality of peak wavelengths in the plurality of fluorescence spectra, extracting a plurality of fluorophore concentrations from a database, and generating a concentration image. The plurality of peak wavelengths are detected by detecting a respective peak wavelength of the plurality of peak wavelengths. Each of the plurality of fluorophore concentrations is associated with a respective peak wavelength of the plurality of peak wavelengths. The concentration image includes a first plurality of pixels. The concentration image is generated based on a respective fluorophore concentration of the plurality of fluorophore concentrations.

Optical imaging based on spectral shift assessment

A microstrip antenna is disclosed. The microstrip antenna includes a dielectric substrate with a first relative permittivity, a metal patch, and a magneto-dielectric superstrate. The metal patch is printed on the dielectric substrate, and the magneto-dielectric superstrate is placed above the metal patch.

Reducing mutual coupling and back-lobe radiation of a microstrip antenna

A substrate integrated waveguide (SIW) slot antenna may include a substrate that may have a first substrate portion with a first permittivity less than unity and a second substrate portion with a second permittivity. The substrate may include a top surface and a bottom surface. The exemplary SIW slot antenna may further include a first conductive layer disposed on the top surface, a second conductive layer disposed on the bottom surface, a transverse slot on the first conducting layer, waveguide sidewalls that may include a plurality of spaced-apart metal-lined vias traversing the substrate, and a microstrip feed line on the first conducting layer.

Wideband substrate integrated waveguide slot antenna

Growing community of inventors

Tehran, Iran

Amir Jafargholi