A dual polarized antenna feed system can include a first single polarized antenna feed element oriented on a first axis relative to a polarization filter and a second single polarized antenna feed element oriented on a second axis relative to the polarization filter such that the first and second axes are not common and not parallel. The polarization filter can include a plurality of conductors, a polarization of the first single polarized antenna feed element can be parallel to the plurality of conductors so that the polarization filter can reflect a majority of incident signals originating from the first single polarized antenna feed element, and a polarization of the second single polarized antenna feed element can be orthogonal to the plurality of conductors so that the polarization filter can be transparent to a majority of incident signals originating from the second single polarized antenna feed element.

Disclosed are devices and methods for selecting, at an antenna reflector, electromagnetic waves with a certain polarization and frequency and rejecting electromagnetic waves with different polarizations and/or frequencies. In one aspect, a directional antenna includes a shaped reflector surface with a series of conforming layers attached to the surface. The layers include a reflecting layer that causes reflection of electromagnetic waves at a specific frequency and polarization. Underneath the reflecting layer is a frequency selective surface (FSS) layer that absorbs electromagnetic waves not at the specific frequency or polarization which pass through the reflecting layer. Underneath the absorbing layer is a conductive layer.

Embodiments disclosed herein relates to a radar device, and more particularly, to a radar device having a structure that reduces the influence of an internal reflected wave, which is capable of preventing a target sensing performance from being deteriorated by a reflected wave reflected within the radar device, while having a cover structure that is capable of protecting an antenna from the outside.

An imaging system includes a first camera and a second camera. A first antenna arrangement collects image light from a first scene as seen by the first camera, and a second antenna arrangement collects image light from a second, different scene as seen by the second camera. The first antenna arrangement includes a first polarized dish antenna and the second antenna arrangement includes a second polarized dish antenna. The first camera and the second camera are supported with a first polarization of the first polarized dish antenna orthogonal to a second polarization of the second polarized dish antenna such that at least some of the image light from the first scene travels through the second polarized dish antenna to reach the first camera and at least some of the image light from the second scene travels through the first polarized dish antenna to reach the second camera.

An antenna device comprises a PCB support divided into at least first, second, third and fourth subsections, a plurality of receiver means including at least first receiver means for receiving telecommunications signals at least a first receiver frequency band and a second receiver frequency band, a second receiver means for receiving telecommunications signals with in a third receiver frequency band and a fourth receiver frequency band, and third receiver means for receiving telecommunications signals in a fifth receiver frequency band, a plurality of transmitter means including at least first transmitter means for transmitting telecommunications signals in at least a first transmitter frequency band and a second transmitter frequency band, second transmitter means for transmitting telecommunications signals in a third transmitter frequency band and a fourth transmitter band, and at least a third transmitter means for transmitting telecommunications signals in a fifth transmitter frequency band. The first receiver means are arranged in the first subsection and are arranged to receive telecommunications signals in a first polarisation, the second receiver means are arranged in the second support subsection to receive telecommunications signals in said second polarisation, the first transmitter means are arranged in the third support, subsection to transmit telecommunications signals in a second polarisation, and the second transmitter means are arranged in the fourth subsection to transmit telecommunications signals in said first polarisation.

An antenna device comprises a PCB support divided into at least first, second, third and fourth subsections, a plurality of receiver means including at least first receiver means for receiving telecommunications signals at least a first receiver frequency band and a second receiver frequency band, a second receiver means for receiving telecommunications signals with in a third receiver frequency band and a fourth receiver frequency band, and third receiver means for receiving telecommunications signals in a fifth receiver frequency band, a plurality of transmitter means including at least first transmitter means for transmitting telecommunications signals in at least a first transmitter frequency band and a second transmitter frequency band, second transmitter means for transmitting telecommunications signals in a third transmitter frequency band and a fourth transmitter band, and at least a third transmitter means for transmitting telecommunications signals in a fifth transmitter frequency band. The first receiver means are arranged in the first subsection and are arranged to receive telecommunications signals in a first polarisation, the second receiver means are arranged in the second support subsection to receive telecommunications signals in said second polarisation, the first transmitter means are arranged in the third support, subsection to transmit telecommunications signals in a second polarisation, and the second transmitter means are arranged in the fourth subsection to transmit telecommunications signals in said first polarisation.

A twistarray reflector includes: a reflector having front reflecting surface comprising wires and a back reflecting surface, the front reflecting surface fabricated from the wires and composites where the wires are placed having an orientation at each point on the front surface to decompose an incident field into orthogonal components so that an electromagnetic reflected from the front surface when superposed with a phase-inverted electromagnetic field reflected from the back reflecting surface produces a net reflected electromagnetic field that is polarized in a specific vector direction with consistent phase.

A twistarray reflector includes: a reflector having front reflecting surface comprising wires and a back reflecting surface, the front reflecting surface fabricated from the wires and composites where the wires are placed having an orientation at each point on the front surface to decompose an incident field into orthogonal components so that an electromagnetic reflected from the front surface when superposed with a phase-inverted electromagnetic field reflected from the back reflecting surface produces a net reflected electromagnetic field that is polarized in a specific vector direction with consistent phase.

The present invention is a radio signal transmitting antenna (10) including a first wave source (11) including a plurality of antenna elements (A1 to AN) configured to form a first helical beam (H) for OAM (Orbital Angular Momentum) from the plurality of antenna elements (A1 to AN) and output the first helical beam (H) and a second wave source (15) configured to receive the first helical beam (H) and form a second helical beam (L) output in a constant direction and transmits the second helical beam (L). The radio signal transmitting antenna (10) can transmit a helical beam (L) for OAM with a simplified and smaller device configuration.

The present invention is a radio signal transmitting antenna (10) including a first wave source (11) including a plurality of antenna elements (A1 to AN) configured to form a first helical beam (H) for OAM (Orbital Angular Momentum) from the plurality of antenna elements (A1 to AN) and output the first helical beam (H) and a second wave source (15) configured to receive the first helical beam (H) and form a second helical beam (L) output in a constant direction and transmits the second helical beam (L). The radio signal transmitting antenna (10) can transmit a helical beam (L) for OAM with a simplified and smaller device configuration.