Amirkabir University of Technology

Amirkabir University of Tehran

Mehran Ahadi

Amir Jafargholi

Parviz Parvin

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

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.

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Tehran, Iran

Mehran Ahadi