Millimeter wave imaging devices are provided. A millimeter wave imaging device includes a housing and one or more heating elements inside the housing. The millimeter wave imaging device includes a flexible gasket on the housing. The millimeter wave imaging device includes a main lens attached to the housing by the flexible gasket. The millimeter wave imaging device includes a protective lens on an outer surface of the main lens. Moreover, the millimeter wave imaging device includes an Electromagnetic Impulse (EMI) filter attached to the housing and extending along an inner surface of the main lens. Methods of operating millimeter wave imaging devices are also provided.

An apparatus and method for mitigating polarization mismatch in reflector antenna systems. A feed unit is configured to determine a polarization mismatch between a first polarization associated with a first wave and a second polarization associated with a reflector unit. The feed unit pre-distorts the first wave to achieve a compensated polarization for reducing and/or eliminating a polarization mismatch. The pre-distorted first wave having the compensated polarization is used to illuminate the reflector unit. A re-radiated wave is reflected by the reflector unit. Furthermore, the level of the re-radiated wave is increased as a result of the pre-distortion.

An apparatus and method for mitigating polarization mismatch in reflector antenna systems. A feed unit is configured to determine a polarization mismatch between a first polarization associated with a first wave and a second polarization associated with a reflector unit. The feed unit pre-distorts the first wave to achieve a compensated polarization for reducing and/or eliminating a polarization mismatch. The pre-distorted first wave having the compensated polarization is used to illuminate the reflector unit. A re-radiated wave is reflected by the reflector unit. Furthermore, the level of the re-radiated wave is increased as a result of the pre-distortion.

Provided is a dual-band multimode antenna feed for a high-frequency band and a low-frequency band. The feed includes four high-frequency waveguide ports, where each high-frequency waveguide port is connected to a respective high-frequency input/output waveguide. Each high-frequency input/output waveguide includes a high-frequency waveguide aperture facing a first section for mixing electromagnetic modes in the E-plane. The first section is connected to a second section for mixing electromagnetic modes in the H-plane. The feed further includes a low-frequency waveguide port connected to a low-frequency input/output waveguide. A filter is arranged inside the first section to be transparent for plane wave modes exhibited at lower frequencies and reflecting for plane wave modes exhibited at higher frequencies.

A system, in a programmable active reflector (AR) device associated with a first radio frequency (RF) device and a second RF device, receives a request and associated metadata from the second RF device via a first antenna array. Based on the received request and associated metadata, one or more antenna control signals are received from the first RF device. The programmable AR device is dynamically selected and controlled by the first RF device based on a set of criteria. A controlled plurality of RF signals is transmitted, via a second antenna array, to the second RF device within a transmission range of the programmable AR device based on the associated metadata. The controlled plurality of RF signals are cancelled at the second RF device based on the associated metadata.

A system, in a programmable active reflector (AR) device associated with a first radio frequency (RF) device and a second RF device, receives a request and associated metadata from the second RF device via a first antenna array. Based on the received request and associated metadata, one or more antenna control signals are received from the first RF device. The programmable AR device is dynamically selected and controlled by the first RF device based on a set of criteria. A controlled plurality of RF signals is transmitted, via a second antenna array, to the second RF device within a transmission range of the programmable AR device based on the associated metadata. The controlled plurality of RF signals are cancelled at the second RF device based on the associated metadata.

Provided are a broadband wavelength plate device having a simple configuration and being capable of precisely performing optical modulation and a method of manufacturing the broadband wavelength plate device, the broadband wavelength plate device including a first conductive layer, a multiple-quantum-well layer in which well layers and barrier layers are alternately stacked, disposed on the first conductive layer, and an antenna layer disposed on the multiple-quantum-well layer and having a shape of a plurality of stripes parallel to one another.

Provided are a broadband wavelength plate device having a simple configuration and being capable of precisely performing optical modulation and a method of manufacturing the broadband wavelength plate device, the broadband wavelength plate device including a first conductive layer, a multiple-quantum-well layer in which well layers and barrier layers are alternately stacked, disposed on the first conductive layer, and an antenna layer disposed on the multiple-quantum-well layer and having a shape of a plurality of stripes parallel to one another.

Millimeter wave imaging devices are provided. A millimeter wave imaging device includes a housing and one or more heating elements inside the housing. The millimeter wave imaging device includes a flexible gasket on the housing. The millimeter wave imaging device includes a main lens attached to the housing by the flexible gasket. The millimeter wave imaging device includes a protective lens on an outer surface of the main lens. Moreover, the millimeter wave imaging device includes an Electromagnetic Impulse (EMI) filter attached to the housing and extending along an inner surface of the main lens. Methods of operating millimeter wave imaging devices are also provided.

A system including a plurality of circuits in a first radio frequency (RF) device which are configured to control a plurality of reflector devices based on a set of criteria. The controlled plurality of reflector devices transmit a plurality of RF signals in a specified direction and a specified location of a second RF device within transmission range of the controlled plurality of reflector devices. The plurality of RF signals are transmitted in the specified direction and the specified location of a second RF device based on a request for signal cancellation. The request for the signal cancellation is based on a noise from the second RF device and the plurality of RF signals are cancelled in the specified direction and the specified location of the second RF device.