The invention concerns a monitoring method that comprises coupling in an integral manner at least one electromagnetic mirror of passive type with a given target to be monitored and monitoring the given target; wherein monitoring the given target includes: acquiring, via one or more synthetic aperture radar(s) installed on board one or more satellites and/or one or more aerial platforms, SAR images of a given area of the earth's surface where the given target is located; and determining, via a processing unit, a movement of the electromagnetic mirror on the basis of the acquired SAR images.

The invention concerns a monitoring method that comprises coupling in an integral manner at least one electromagnetic mirror of passive type with a given target to be monitored and monitoring the given target; wherein monitoring the given target includes: acquiring, via one or more synthetic aperture radar(s) installed on board one or more satellites and/or one or more aerial platforms, SAR images of a given area of the earth's surface where the given target is located; and determining, via a processing unit, a movement of the electromagnetic mirror on the basis of the acquired SAR images.

An antenna diameter adjustment method for adjusting an antenna diameter by changing a distance between a part of each of a plurality of reflectors at which the radio signal is reflected, the plurality of reflectors each being configured to reflect radio signals emitted from a plurality of radiators from a center of a circle along a radial direction thereof and to radiate the radio signal toward an opposite antenna apparatus, and the center of the circle along the radial direction of the circle.

An antenna diameter adjustment method for adjusting an antenna diameter by changing a distance between a part of each of a plurality of reflectors at which the radio signal is reflected, the plurality of reflectors each being configured to reflect radio signals emitted from a plurality of radiators from a center of a circle along a radial direction thereof and to radiate the radio signal toward an opposite antenna apparatus, and the center of the circle along the radial direction of the circle.

This disclosure relates generally to radar retroreflective articles comprising one or more dielectric layers adjacent to a reflective layer, wherein the dielectric layer or layers aids in increasing the radar cross section of the radar retroreflective articles.

This disclosure relates generally to radar retroreflective articles comprising one or more dielectric layers adjacent to a reflective layer, wherein the dielectric layer or layers aids in increasing the radar cross section of the radar retroreflective articles.

A radio frequency antenna array uses lenses and RF elements, to provide ground-based coverage for cellular communication. The antenna array can include two spherical lenses, where each spherical lens has at least two associated RF elements. Each of the RF elements associated with a given lens produces an output beam with an output area. Each lens is positioned with the other lenses in a staggered arrangement. The antenna includes a control mechanism configured to enable a user to move the RF elements along their respective tracks, and automatically phase compensate the output beams produced by the RF elements based on the relative distance between the RF elements.

A compact antenna test range equipment of the invention includes a microwave darkroom including a plurality of walls connected to each other, a reflector disposed in the microwave darkroom and comprising a reflecting surface having a polygon shape comprising a plurality of edges and a plurality of corners, each of the corners is located between two of the edges, wherein each of the corners aiming at one of the walls, a feeding antenna disposed in the microwave darkroom and corresponding to any position of the reflecting surface, and a test turning table disposed in the microwave darkroom and configured to bear a testing piece which is disposed in a quiet zone and exited by a plane electromagnetic wave. The feeding antenna transmits electromagnetic waves to the reflecting surface so as to generate a plane electromagnetic waves or receive electromagnetic waves from the quiet zone.

A compact antenna test range equipment of the invention includes a microwave darkroom including a plurality of walls connected to each other, a reflector disposed in the microwave darkroom and comprising a reflecting surface having a polygon shape comprising a plurality of edges and a plurality of corners, each of the corners is located between two of the edges, wherein each of the corners aiming at one of the walls, a feeding antenna disposed in the microwave darkroom and corresponding to any position of the reflecting surface, and a test turning table disposed in the microwave darkroom and configured to bear a testing piece which is disposed in a quiet zone and exited by a plane electromagnetic wave. The feeding antenna transmits electromagnetic waves to the reflecting surface so as to generate a plane electromagnetic waves or receive electromagnetic waves from the quiet zone.

A radio frequency antenna array uses lenses and RF elements, to provide ground-based coverage for cellular communication. The antenna array can include two spherical lenses, where each spherical lens has at least two associated RF elements. Each of the RF elements associated with a given lens produces an output beam with an output area. Each lens is positioned with the other lenses in a staggered arrangement. The antenna includes a control mechanism configured to enable a user to move the RF elements along their respective tracks, and automatically phase compensate the output beams produced by the RF elements based on the relative distance between the RF elements.