A polarizing reflector for broadband antennas includes a flat dielectric substrate, a patch array layer formed by a bi-dimensionally periodic lattice of thin metallic patches along first and second perpendicular directions x, y, and a ground layer. All the patches have a same shape elongated along the second direction y and form electric dipoles when electrically excited along the second direction y. For each row the patches of the said row are interconnected by an elongated metallic strip oriented along the first direction x and having a width c. The geometry of the patch array, the thickness h and the dielectric permittivity .sub.r of the substrate, and the width c of the elongated metallic strips are tuned so that the patch array including the elongated metallic strips induces a fundamental aperture mode and a complementary fundamental dipolar mode along two orthogonal TE and TM polarizations within a single operating frequency band or two separate operating frequency bands, and the differential phase between the two fundamental modes over the single or the first and second frequency bands being equal to 90 or to an odd integer multiple of 90. The polarizing reflector can comprise also a curved substrate and a patch array layer formed by a bi-dimensionally lattice of metallic patches along first curvilinear rows and second curvilinear columns.

An active electronically scanned array (AESA) is disclosed. The AESA includes a linear-to-circular polarizer coupled to a radiating aperture and one or more transmit-receive modules coupled to radiating elements and a liquid cooling manifold having a plurality of distributed liquid cooling ducts disposed adjacent the one or more transmit-receive modules to provide cooling of the AESA during high-power operation.

A method for generating a circular polarisation signal from at least two transponders of a satellite able to process linearly polarised signals includes: a transmission of at least two linearly polarised signal components so as to produce a circularly polarised signal by at least two transponders of a satellite; processing signals by the two transponders of the satellite to produce a circular polarisation of the signals transmitted by the satellite; ground receiving by at least one circularly polarised antenna; measuring a physical parameter from the received signals, and determining a correction parameter to be applied to the generation of the components of linearly polarised signals; generating a compensation of the components of linearly polarised signals transmitted to the satellite.

A nonplanar metamaterial polarizer includes: a substrate including dielectric material transmissive to electromagnetic radiation and having a nonplanar shape; a first conductive pattern on a first side of the substrate; and a second conductive pattern on a second side of the substrate. The first and second conductive patterns are configured to alter the polarization of the electromagnetic radiation as it transmits through the substrate. In some cases, the first and second conductive patterns include split-ring resonators, and the nonplanar shape is a cylinder. An antenna system includes the nonplanar metamaterial polarizer and an antenna inside or adjacent to the nonplanar metamaterial polarizer and configured to transmit or receive the electromagnetic radiation through the nonplanar metamaterial polarizer while the nonplanar metamaterial polarizer alters the polarization of the transmitted or received electromagnetic radiation. In some cases, the antenna is a monopole antenna, a dipole antenna, a biconical antenna, or a discone antenna.

Methods, systems, and devices for wireless communications are described. Wireless communications systems may support communications between various network nodes via repeaters to extend coverage to areas that may be otherwise uncovered. A repeater may forward a signal using a circular polarization type. A receiving network node may receive a signal transmitted with a circular polarization type using a linear antenna configuration without a risk of the signal being orthogonal to the linear antenna configuration, and therefore not received by the receiving network node. A repeater may report, to a control entity, a capability of the repeater to forward signals using a set of one or more polarization types (e.g., including at least one circular polarization type), and in response the repeater may receive scheduling information indicating for the repeater to forward a signal in a given communication resource using a particular polarization type (e.g., a particular circular polarization type).

A polarizing screen for altering a polarization state of a radio frequency waveform radiated from a parallel plate waveguide (PPW) wherein the waveform has a centre frequency and a bandwidth, the polarizing screen comprising a plurality of developable sheets arranged stacked in parallel to each other in direction of a local normal vector of a first sheet at respective inter-sheet spacings, each sheet comprising an electrically conductive pattern forming a one-dimensional periodic structure of unit-cells in an extension direction, wherein the periodic structure is associated with a height measured orthogonally to the extension direction and orthogonally to the local normal vector of the shat, where each cell comprises an aperture configured to transmit the radio frequency waveform at a predetermined polarization state, wherein the height is determined in dependence of the centre frequency and/or the bandwidth of the radio frequency waveform such that the pre-determined polarization state is provided as well as matching between the PPW and a transmission medium of the radio frequency waveform.

A control system is presented for controlling operation of a phased-array antenna comprising N antenna elements each comprising H and V polarization terminals. The control system includes: an analogue circular polarization system (ACTS) and a digital polarization control system (DPCS). The ACPS comprises an array of N analogue circular polarization circuits (ACPCs) associated with said N antenna elements, respectively, such that each ACPC is connectable to the V and H polarization terminals of the respective antenna element. The ACPS is configured and operable with N analog circular polarization signal components each being either left or right circular polarization signal. The DPCS comprises: an array of N convertors associated with said N ACPCs, respectively, for converting between the N analog circular polarization (ACP) signals and N respective digital circular polarization (DCP) signals, such that each antenna element is associated with a respective single one of said N convertors; an array of N digital polarization controlled beamformers (DPCBs) connectable to said N convertors; and a plurality of digital signal splitters and/or combiners. Each DPCB comprises at least two beam forming channels associated with at least two, first and second, respective beams of different beam directions and/or different polarizations being operated by the antenna element, and is configured and operable to apply phase shifting to the respective DCP signal based on data indicative of a beaming direction () of a respective beam to be operated and the left or right polarization of circular polarization signal, and a relative phase () associated with the beaming direction () and a location of the respective antenna element in the array, to thereby form at least two phase shifted signals corresponding to said at least two, first and second, respective beams. Digital signal splitters and/or combiners operate to separately combine the phase shifted signals corresponding to respectively the at least first and second beams, wherein at least two convertors of said N convertors are connected to a respective one of the signal splitters and/or combiners, and wherein each digital splitter and/or combiner, connected to the at least two converters, converts between the DCP signals of opposite left and right circular polarizations of the at least two convertors and V and H linear polarization components and splits and/or combines the opposite left and right circular polarization signals of the at least two convertors.

In a vital sign sensor of the present invention, an antenna assembly radiates an oscillation signal generated by a SIL oscillator to an object in a form of a wireless signal and receives a reflected signal from the object, and the reflected signal can have the SIL oscillator injection-locked. The wireless signal radiated from the antenna assembly is transmitted to a demodulator for demodulation such that the vital signs of the object can be obtained. Additionally, an isolator of the antenna assembly is provided to prevent the SIL oscillator from receiving a clutter reflected from the demodulator and an environment where the demodulator is placed. As a result, the clutter can't influence the vital sign detection of the object.

A steerable beam antenna includes a feed line and first and second arrays of switchable scatterers along opposite sides of the feed line. The first array scatters an electromagnetic wave propagating through the feed line to form a first beam portion with a first polarization, and the second array scatters the propagating wave to form a second beam portion with a second polarization orthogonal to the first polarization. Each scatterer in the first and second arrays is switchable between a high state and a low state, the high state scatterers and the low-state scatterers in each of the first and second arrays defining a periodic pattern. The scatterers in the first and second arrays are switchable to shift the pattern of scatterers in one of the arrays relative to the pattern in the other array by a selectable period shift that yields a desired polarization for the beam.

Systems and methods for polarization converters are disclosed. An example wireless communication system includes a first transceiver module of a wireless communication system configured to form one or more linearly polarized communication links with a second transceiver module of the wireless communication system, and a polarization converter positioned between the first and second transceiver modules and configured to convert the one or more linearly polarized communication links to circularly polarized communication links. The polarization converter includes first and second frequency selective surfaces (FSSs) formed from respective first and second metalized layers of a printed circuit board (PCB), each FSS includes an array of capacitive patches and inductive traces forming an array of unit cells, and each unit cell of the second FSS is aligned with each unit cell of the first FSS.