An illustrative example detector for use on a vehicle includes a radiation emitter having a near field region that is defined at least in part by a wavelength of radiation emitted by the radiation emitter. A radiation steering device includes a plurality of reflectors, an actuator, and a controller. The reflectors are situated to reflect the radiation emitted by the radiation emitter. The reflectors are in the near field region and have at least one characteristic that limits any phase shift of the reflected radiation. The actuator is configured to adjust an orientation of the reflectors. The controller is configured to determine an orientation of the plurality of reflectors relative to the radiation emitter to steer the emitted radiation reflected from the reflectors in a determined direction. The controller is configured to control the actuator to achieve the determined orientation.

An illustrative example detector for use on a vehicle includes a radiation emitter having a near field region that is defined at least in part by a wavelength of radiation emitted by the radiation emitter. A radiation steering device includes a plurality of reflectors, an actuator, and a controller. The reflectors are situated to reflect the radiation emitted by the radiation emitter. The reflectors are in the near field region and have at least one characteristic that limits any phase shift of the reflected radiation. The actuator is configured to adjust an orientation of the reflectors. The controller is configured to determine an orientation of the plurality of reflectors relative to the radiation emitter to steer the emitted radiation reflected from the reflectors in a determined direction. The controller is configured to control the actuator to achieve the determined orientation.

A steerable, high-power microwave antenna includes: a forward-traveling, leaky-wave feed antenna; a trans-reflecting conical-sectional reflector disposed spaced-apart and above said leaky-wave feed antenna and having a conical surface facing said leaky-wave feed antenna and formed of a plurality of electrical conductors held in parallel order in a grill; and a twist-reflector pivotally mounted opposite and spaced-apart from said conical surface of said trans-reflecting conical-sectional reflector. The twist-reflector is adapted to receive microwave energy reflected to it from said conical surface of said trans-reflecting conical-sectional reflector and to rotate the polarization of said microwave energy and reflect said microwave energy back to said trans-reflecting conical-sectional reflector for passing through said trans-reflecting conical-sectional reflector and forming a narrow, pencil-like beam of high energy radiation in polarized form extending outward from said conical surface of said trans-reflecting conical-sectional reflector.

A steerable, high-power microwave antenna includes: a forward-traveling, leaky-wave feed antenna; a trans-reflecting conical-sectional reflector disposed spaced-apart and above said leaky-wave feed antenna and having a conical surface facing said leaky-wave feed antenna and formed of a plurality of electrical conductors held in parallel order in a grill; and a twist-reflector pivotally mounted opposite and spaced-apart from said conical surface of said trans-reflecting conical-sectional reflector. The twist-reflector is adapted to receive microwave energy reflected to it from said conical surface of said trans-reflecting conical-sectional reflector and to rotate the polarization of said microwave energy and reflect said microwave energy back to said trans-reflecting conical-sectional reflector for passing through said trans-reflecting conical-sectional reflector and forming a narrow, pencil-like beam of high energy radiation in polarized form extending outward from said conical surface of said trans-reflecting conical-sectional reflector.

Antenna assembly comprising the combination of a steerable phased array antenna with omnidirectional sector and a GNSS antenna, and antenna system comprising the antenna assembly.

An antenna device includes a main reflector (11), a sub-reflector (12) including sub-reflector panels and having a reflecting surface facing a reflecting surface of the main reflector, and a primary emitter (13) to receive a radio wave reflected by the sub-reflector (12). Each of sub-reflector panel drive mechanisms coupled to the sub-reflector panels is finely driven. A phase calculator (171) calculates a relative phase of an element electric-field vector corresponding to each of the sub-reflector panels based on a change in received electric-field strength of the radio wave received by the primary emitter (13) during driving of the sub-reflector panel drive mechanisms, and determines positions of the sub-reflector panels at which a phase distribution on an aperture surface of the main reflector (11) is minimized.

An antenna device includes a main reflector (11), a sub-reflector (12) including sub-reflector panels and having a reflecting surface facing a reflecting surface of the main reflector, and a primary emitter (13) to receive a radio wave reflected by the sub-reflector (12). Each of sub-reflector panel drive mechanisms coupled to the sub-reflector panels is finely driven. A phase calculator (171) calculates a relative phase of an element electric-field vector corresponding to each of the sub-reflector panels based on a change in received electric-field strength of the radio wave received by the primary emitter (13) during driving of the sub-reflector panel drive mechanisms, and determines positions of the sub-reflector panels at which a phase distribution on an aperture surface of the main reflector (11) is minimized.

The application discloses a one or two dimensional array of electromagnetic scatterers n scatterers (ED), whereby the aforementioned scatterers (ED) are arranged aperiodically on a curved line or surface (S). Further, the application describes a reflectarray antenna comprising at least one such array of electromagnetic scatters (ED) and at least one receiving and/or transmitting feed (F), cooperating with said array to generate an antenna beam A method for designing and manufacturing sais array and said antenna is explained. The method optimizes in a several stages all degrees of freedom in order improve the performance of reflectarrays, increase the flexibility thereof and/or the conformity thereof with design specifications (radio pattern) and/or allowing said specifications to be satisfied with a smaller number of scatters.

The application discloses a one or two dimensional array of electromagnetic scatterers n scatterers (ED), whereby the aforementioned scatterers (ED) are arranged aperiodically on a curved line or surface (S). Further, the application describes a reflectarray antenna comprising at least one such array of electromagnetic scatters (ED) and at least one receiving and/or transmitting feed (F), cooperating with said array to generate an antenna beam A method for designing and manufacturing sais array and said antenna is explained. The method optimizes in a several stages all degrees of freedom in order improve the performance of reflectarrays, increase the flexibility thereof and/or the conformity thereof with design specifications (radio pattern) and/or allowing said specifications to be satisfied with a smaller number of scatters.

A Cassegrain-type metamaterial antenna, includes: a metamaterial main reflector having a central through-hole, a feed source disposed in the central through-hole, and a sub-reflector disposed in front of the feed source, where an electromagnetic wave radiated by the feed source is emerged in a form of a plane wave after being reflected by the sub-reflector and the metamaterial main reflector in sequence; the metamaterial main reflector includes: a first core layer and a first reflection layer disposed on a rear surface of the first core layer, where the first core layer includes at least one first core layer lamella, and the first core layer lamella includes: a first base material and multiple first conductive geometric structures disposed on the first base material; and a far focus of the sub-reflector coincides with a phase center of the feed source. A paraboloid is replaced with a lamellar metamaterial main reflector.