An apparatus for space and terrestrial communication applications includes a Ka-band horn combined with a S-band cross-polarization cup. The S-band cross-polarization cup is placed around a neck of the Ka-band horn in a form of a collar.

The present disclosure relates to a curved conformal frequency selective surface (FSS) radome. The radome includes a dielectric radome and a curved conformal FSS array arranged on an outer wall of the dielectric radome, where the dielectric radome includes a dome, a circular truncated cone and a hollow cylinder which are integrally formed from top to bottom, and the curved conformal FSS array is formed by periodically arraying foldable FSS units on an outer surface of the dielectric radome, the foldable FSS unit being of an axially symmetrical and centrally symmetrical gap structure, and having an overall shape consisting of foldable gaps on a left side, an upper side, a right side and a lower side, the four foldable gaps being sequentially connected in a square shape, and remaining parts of the foldable FSS unit except for the four foldable gaps being all metal patches.

The disclosed structures and methods are directed to antenna systems configured to transmit and receive a wireless signal in and from different directions. An antenna for transmission of electromagnetic (EM) waves comprises a phased array and a metastructure. The phased array has radiated elements configured to radiate the EM waves. The metastructure is located at a phased array distance from the phased array to receive the EM waves at the first angle and to transmit the EM waves at a second angle, the second angle being larger than the first angle. The metastructure comprises three impedance layers arranged in parallel to each other and each impedance layer comprising a plurality of metallization elements. Each metallization element has a first dipole and a pair of first capacitance arms located on each end of the first dipole approximately perpendicular to the first dipole.

A unitary radome layer assembly is provided and includes a first nanocomposite formulation and a second nanocomposite formulation. The first and second nanocomposite formulations are provided together in a unitary radome layer with respective distribution gradients.

The invention discloses shared-aperture dual-band dual-polarized antenna array and communication equipment. The antenna array comprises a first dielectric substrate, a second dielectric substrate, a third dielectric substrate, a fourth dielectric substrate, and a fifth dielectric substrate. The first dielectric substrate, the second dielectric substrate, and the third dielectric substrate constitute a dielectric substrate group. The dielectric substrate group is provided with a low-frequency antenna element and four high-frequency antenna elements. The low-frequency antenna element is loaded with a filtering structure. The low-frequency antenna element and the high-frequency antenna element are fed by coaxial lines. The fourth dielectric substrate and the fifth dielectric substrate form a dual-function metasurface. When the dual-function metasurface is used as an artificial magnetic conductor reflector, the radiation of the low-frequency antenna element is enhanced in a low profile, and when used as a frequency selective surface, the electromagnetic scattering of the low-frequency antenna element in the high-frequency band is suppressed. Compared with the existing solutions, the present invention is more compact, and maintains high cross-band isolation and stable radiation patterns in dual bands.

The present disclosure is a system comprising at least three electronically steered antennas arranged so that there is a baseline difference of a predetermined amount of wavelength between the centers of the antennas, typically configured as an obtuse or scalene triangle, where the distance between each antenna on an array is selected to provide the required accuracy and precision, the array having a timing circuit to ensure that the beam of each antenna is steered to the same azimuthal and elevation coordinates in space simultaneously. This enables the three electronically steered antennas to operate as an interferometer to determine a bearing to a target to ultimately determine the location thereof. The electronically steered antennas enable the system to be mounted on a platform in a small package that was previously difficult for traditional interferometers.

Embodiments of the disclosure include a Radio Detection and Ranging (Radar) system with reduced transmitter antenna and receiver antenna mutual coupling. The radar system includes a transmitter antenna disposed on a first side of the dielectric substrate and a receiver antenna disposed on the same side of the dielectric substrate. The radiation boundaries of the transmitter antenna and the receiver antenna are substantially parallel to a line connecting centroids of the transmitter antenna and the receiver antenna. The radar system also includes a ground plane disposed on a second side of the dielectric substrate, opposite to the first side, operatively connected to the transmitter antenna and the receiver antenna through probes. The ground plane comprises at least one groove, separating vertical projections of the transmitter antenna and the receiver antenna on the ground plane.

A switchable element, a device and a method for analogue and programmable computing operating on electromagnetic waves having a frequency, wherein the switchable element is configured to configured to, in response to an activation signal, switch from having a first dielectric permittivity for electromagnetic waves having a frequency to having a second dielectric permittivity for electromagnetic waves having the frequency, and the device comprises a plurality of the switchable elements that are adapted to be switched individually in accordance with the computing operation.

A method and apparatus for processing a terahertz frequency electromagnetic beam are disclosed. For example, the method receives the terahertz frequency electromagnetic beam via a metamaterial having a plurality of addressable magnetic elements, where a resonant frequency of each of the plurality of addressable magnetic elements is capable of being programmably changed via an adjustment, and activates selectively a subset of the plurality of addressable magnetic elements to manipulate the terahertz frequency electromagnetic beam.

The invention discloses shared-aperture dual-band dual-polarized antenna array and communication equipment. The antenna array comprises a first dielectric substrate, a second dielectric substrate, a third dielectric substrate, a fourth dielectric substrate, and a fifth dielectric substrate. The first dielectric substrate, the second dielectric substrate, and the third dielectric substrate constitute a dielectric substrate group. The dielectric substrate group is provided with a low-frequency antenna element and four high-frequency antenna elements. The low-frequency antenna element is loaded with a filtering structure. The low-frequency antenna element and the high-frequency antenna element are fed by coaxial lines. The fourth dielectric substrate and the fifth dielectric substrate form a dual-function metasurface. When the dual-function metasurface is used as an artificial magnetic conductor reflector, the radiation of the low-frequency antenna element is enhanced in a low profile, and when used as a frequency selective surface, the electromagnetic scattering of the low-frequency antenna element in the high-frequency band is suppressed. Compared with the existing solutions, the present invention is more compact, and maintains high cross-band isolation and stable radiation patterns in dual bands.