An electromagnetic wave reflector includes a panel having a reflective surface that reflects a radio wave of a frequency band selected from 1 GHz to 170 GHz, and a support body that supports the panel. The support body has a connector part electrically connected to the reflective surface, the connector part being configured to propagate a reference potential of a reflection having occurred at the reflective surface.

The present disclosure provides a sub-wavelength structural material having compatibility of low detectability for infrared, laser, and microwave, which includes, from top to bottom, a metal type frequency selective surface layer I, a dielectric layer I, a metal type frequency selective surface layer II, a dielectric layer II, a resistive film, a dielectric layer III. Each of the metal type frequency selective surface layers is a sub-wavelength patch type array, and metal used by the metal type frequency selective surface layers has a characteristic of low infrared emissivity. The present disclosure modulates a phase by using a phase difference generated by patches with different sizes on the metal type frequency selective surface layer I, so as to control backscattering of incident electromagnetic waves to achieve compatibility of low detectability for laser and infrared, while the bottom three layers achieve absorption of microwave.

This application discloses an antenna, including a first antenna and a second antenna. The first antenna includes a first radiating element and a reflector. The reflector is located between the second antenna and the first radiating element. The reflector includes a connection part and a tooth part. The tooth part includes a plurality of comb teeth that are disposed side by side and that extend from the connection part toward the first radiating element. A gap is disposed between adjacent ones of the plurality of comb teeth. The tooth part further includes a profile facing the first radiating element. Each comb tooth includes an end part facing the first radiating element. The profile includes a concave part that is concave to the connection part.

A deployable reflector for an antenna is disclosed. The deployable reflector comprises a deployable membrane configured to adopt a pre-formed shape in a deployed configuration, and an electrically conductive mesh disposed on a surface of the membrane wherein the electrically conductive mesh is configured to permit relative lateral movement between the electrically conductive mesh and the membrane during deployment of the reflector. In the deployed configuration, the conductive mesh adopts the shape of the membrane and forms a reflective surface of the reflector. A method of manufacturing the deployable reflector is also disclosed.

Base station antennas are provided that include a reflector assembly and a radiating element. The reflector assembly includes a reflector. The radiating element extends forwardly from the reflector. The reflector includes a nonmetallic substrate, and a metal layer mounted on the substrate.

A stiffened part formed from at least two members of thermoset composite material including at least one body of a first structure and optionally a second structure. A manufacturing method includes: forming a fibre preform and impregnating each body of the first structure with thermosetting resin or forming a pre-impregnated fibre preform to obtain a body formed from uncured thermosetting composite material supported by a mandrel; optionally partially or fully polymerising at least one body supported by a mandrel; optionally, providing the second structure formed from uncured, partially uncured or fully uncured thermosetting composite material; optionally, depositing a layer of uncured thermosetting adhesive on an area where a fully cured member makes contact with another member of the part; joining the members, each member being juxtaposed with; or stacked upon, at least one other member; fully curing the assembly by heat treatment; removing the mandrel from each fully cured body.

A deployable reflector for an antenna is disclosed. The deployable reflector comprises a deployable membrane configured to adopt a pre-formed shape in a deployed configuration, and an electrically conductive mesh disposed on a surface of the membrane wherein the electrically conductive mesh is configured to permit relative lateral movement between the electrically conductive mesh and the membrane during deployment of the reflector. In the deployed configuration, the conductive mesh adopts the shape of the membrane and forms a reflective surface of the reflector. A method of manufacturing the deployable reflector is also disclosed.

The present disclosure relates to a dichroic spherical antenna. In one embodiment of the present disclosure, a dichroic spherical antenna comprises a collector disposed within a spherically-shaped reflector; wherein the reflector comprises a coating. In some embodiments, the coating comprises a plurality of ferromagnetic particles dispersed throughout an epoxy-based medium. In some embodiments, the collector's interior is held at a pressure less than the pressure exerted on the exterior of the collector. The present disclosure also relates to a method of receiving radio signals, the method comprising the steps of receiving, at a collector disposed inside a spherical reflector, electromagnetic radiation; wherein the exterior of the reflector comprises a coating.

A multilayer thin film that reflects an omnidirectional structural color having a reflective core layer comprising a metallic material, a second layer extending across the reflective core layer, a third layer extending across the second layer, and an outer layer extending across the third layer. The multilayer thin film reflects a single narrow band of visible light that is less than 30° measured in Lab color space when viewed from angles between 0° and 45°, and the reflective core layer has a skin depth δ of greater than or equal to 1.0 μm in a frequency range from 20-40 GHz, as calculated by: $\delta =\sqrt{\frac{2\rho }{\left(2\pi f\right)\left({\mu }_0{\mu }_r\right)}}\approx 503\sqrt{\frac{\rho }{{\mu }_{r}f}},$
δ is skin depth in meters (m); ρ is resistivity in ohm meter (Ω.Math.m); f is frequency of an electromagnetic radiation in hertz (Hz); μ.sub.0 is permeability; and μ.sub.r is relative permeability of the metallic material.

A millimeter-wave (mmW) reflective structure configured to reflect incident millimeter waves is provided. The mmW reflective structure includes: a transparent substrate in which unit cells in the form of a matrix are defined, the transparent substrate having an upper surface parallel to first and second directions which are orthogonal to each other; and conductive patterns arranged in the unit cells on the transparent substrate, each of the conductive patterns having a hollow rectangular shape.