A test system for testing a device under test is described, which comprises an antenna array having a plurality of antenna elements and an adjustment unit having a Fresnel structure. The adjustment unit is placed between the antenna array and the device under test. Further, a method for testing a device under test is described.

A terahertz wave lens includes a substrate having a surface provided with an uneven structure that changes a phase of the terahertz wave. The uneven structure includes a plurality of holes that are periodically arranged. The uneven structure includes a plurality of regions where the plurality of holes are arranged. A height of the hole in a thickness direction of the substrate and a width of the pillar differ for each of the regions. Outer end portions of the uneven structure in the thickness direction are located on the same plane.

A reconfigurable aperture includes a plurality of metallic particles confined to a volume extending across an aperture area. The metallic particles are repositioned within the volume to form opaque regions in the aperture area. The opaque regions, and transmissive regions between the opaque regions, can form a reconfigurable zone plate that can change the collimation of a microwave beam via diffraction therethrough. The zone plate can be located a fixed distance away from a microwave source and a detector in a housing, so that for any specified wavelength produced by the microwave source, the zone plate can reconfigure to have a focal length equal to the fixed distance. The reconfigurable zone plate can effectively collimate microwaves produced by the microwave source, can direct the collimated microwaves in a specified direction, can receive microwaves returning along the specified direction, and can focus the received microwaves onto the detector.

A system comprising a dielectric substrate and a coating system disposed on the dielectric substrate is described. The coating system comprises a Fresnel zone plate lens composed of n coaxial elliptical zones CEZn, n being a positive integer and numbered from 1 to N (n=1, 2, 3, . . . , N wherein N is a positive integer greater than or equals to 2 (N2)) defining odd and even coaxial elliptical zones. The odd coaxial elliptical zones are partially decoated with a specific odd decoating pattern and/or the even coaxial elliptical zones are partially decoated with a specific even decoating pattern. A method to decoat and a method to use the system to focalize an incident EM wave having wavelengths between 0.3 GHz and 110 GHz through the system to an indoor equipment at a desired location is also described.

A radome having multi-size metal patterns and a radar device using the radome are provided. The radome includes alternately-arranged dielectric substrates and metal layers. Each metal layer includes metal frames and metal patterns wherein the metal patterns are electrically insulated from each other. A gap width corresponding to one metal pattern of one metal layer is a width of a gap defined between the metal pattern and a nearest metal frame to the metal pattern. The gap widths corresponding to the metal patterns are increasing, decreasing and further increasing in sequence along a radial direction extending from a center to an outer edge of the metal layer. The outmost layers at both sides of the radome are metal layers. The metal layers have substantially identical layout.

An antenna module and communication device containing the antenna module are disclosed. The antenna module is disposed in a metal cavity. The antenna module includes a switched beam mm-wave antenna array having radiating elements separated by less than a wavelength of the radiating elements. The array is fed by a single transceiver chain. The array is disposed at the focal length of a low-profile mm-wave lens configured to steer the beam. A sub-10 GHz antenna is disposed closer to the opening of the cavity than the lens. The lens is a Fresnel Zone Plate lens having a focal length of less than about the wavelength of the beam, or a Saucer lens having shells of different refractive indexes and having a profile that is more than 6 times smaller than a Luneburg lens with a same focal length.

A lens design method is disclosed for designing a lens to reshape an actual far-field radiation pattern of a radiation source, such as a spiral antenna, to a preferred far-field radiation pattern. The method comprises: determining a preferred far-field radiation pattern of the radiation source; deriving a corresponding near-field radiation pattern from the preferred far-field radiation pattern; determining an actual near-field pattern of the radiation source; mapping an electric field and a magnetic field of the actual near-field radiation pattern to the derived near-field radiation pattern using a transfer relationship, the transfer relationship comprising material parameters which characterise the lens; and, determining the material parameters.

Disclosed is a Cassegrain microwave antenna, which comprises a radiation source, a first metamaterial panel used for radiating an electromagnetic wave emitted by the radiation source, and a second metamaterial panel having an electromagnetic wave convergence feature and used for converting into plane wave the electromagnetic wave radiated by the first metamaterial panel. Employment of the principle of metamaterial for manufacturing the antenna allows the antenna to break away from restrictions of conventional concave lens shape, convex lens shape, and parabolic shape, thereby allowing the shape of the Cassegrain microwave antenna to be panel-shaped or any shape as desired, while allowing for reduced thickness, reduced size, and facilitated processing and manufacturing, thus providing beneficial effects of reduced costs and improved gain effect.

Disclosed is an offset feed satellite television antenna comprising a metamaterial panel (100) arranged behind a feed (1). The metamaterial panel (100) comprises a core layer (10) and a reflective panel (200) arranged on a lateral surface of the core layer (10). The core layer (10) comprises at least one core layer lamella (11). The core layer lamella (11) can be divided into multiple belt areas on the basis of refractive indexes. With a fixed point as a center, the refractive indexes on the multiple belt areas are identical at a same radius, while the refractive indexes on each belt area decrease gradually as the radius increases. For two adjacent belt areas, the minimum value of the refractive indexes of the inner belt area is less than the maximum value of the refractive indexes of the outer belt area. A connection between the center and the feed (1) is perpendicular to the core layer lamella (11), while the center does not overlap the center of the core layer lamella (11). In addition, the present invention also provides a satellite television receiver system having the offset feed satellite television antenna. The present invention allows for facilitated manufacturing and processing, and for further reduced costs.

A front feed microwave antenna, which comprises a radiation source, a first metamaterial panel used for radiating an electromagnetic wave emitted by the radiation source, a second metamaterial panel, and a reflective panel affixed to the back of the first metamaterial panel. The electromagnetic wave is emitted via the first metamaterial panel, refracted by entering the second metamaterial panel, reflected by the reflective panel, and finally re-refracted by reentering the second metamaterial panel, then finally parallel-emitted.