A microwave transmission structure is disclosed that includes a mode converter coupling a rectangular waveguide section in which microwave energy propagates in a first mode to a transmission line section in which microwave energy propagates in a second mode. The waveguide section, the mode converter and the transmission line section are cooperatively configured and arranged along a common propagation axis such that microwave energy can propagate in a linear direction through the microwave transmission structure while undergoing a mode conversion at the mode converter.

A metalens capable of concentrating terahertz waves having a high light concentration efficiency. The metalens includes a first region that has a plurality of microstructures disposed therein to concentrate terahertz waves; and a second region that is a region that surrounds the first region and that is a region different from the first region, in which in a case where terahertz waves having a wavelength of 0.3 mm, a wavelength of 1 mm, and a wavelength of 3 mm are incident, assuming that a wavelength having a highest light concentration efficiency is a wavelength X, a transmittance of the terahertz waves having the wavelength X in the first region is a transmittance T1, and a transmittance of the terahertz waves having the wavelength X in the second region is a transmittance T2, the transmittance T2 is lower than the transmittance T1.

A metalens capable of concentrating terahertz waves having a high light concentration efficiency. The metalens includes a first region that has a plurality of microstructures disposed therein to concentrate terahertz waves; and a second region that is a region that surrounds the first region and that is a region different from the first region, in which in a case where terahertz waves having a wavelength of 0.3 mm, a wavelength of 1 mm, and a wavelength of 3 mm are incident, assuming that a wavelength having a highest light concentration efficiency is a wavelength X, a transmittance of the terahertz waves having the wavelength X in the first region is a transmittance T1, and a transmittance of the terahertz waves having the wavelength X in the second region is a transmittance T2, the transmittance T2 is lower than the transmittance T1.

Provided is a wave control medium capable of controlling waves while miniaturizing and expanding the bandwidth of metamaterials or the like. The wave control medium according to the present technique includes a three-dimensional structure that includes a combination of a plurality of microstructures. The present technique makes it possible to provide a wave control medium capable of controlling waves while miniaturizing and expanding the bandwidth of metamaterials or the like.

Provided is a wave control medium capable of controlling waves while miniaturizing and expanding the bandwidth of metamaterials or the like. The wave control medium according to the present technique includes a three-dimensional structure that includes a combination of a plurality of microstructures. The present technique makes it possible to provide a wave control medium capable of controlling waves while miniaturizing and expanding the bandwidth of metamaterials or the like.

A C-Band array is formed of beamwidth-controlled radiator column. Each beamwidth-controlled radiator columns comprises a plurality of radiators; and a reconfigurable lens disposed over the plurality of radiators, wherein the reconfigurable lens has a bottom layer that has a plurality of bottom layer holes, and a middle layer that has two middle layer sections that are separated along an azimuth axis by a gap, and wherein the reconfigurable lens has one or more beamwidth control sliders that are configurable to translate along a vertical axis, wherein the reconfigurable lens is formed of a dielectric material. By translating the beamwidth control sliders, one can adjust the azimuth beamwidth of the radiators. This may be done remotely after the antenna is deployed, to adjust for optimal beamwidth in the presence of interferers.

A C-Band array is formed of beamwidth-controlled radiator column. Each beamwidth-controlled radiator columns comprises a plurality of radiators; and a reconfigurable lens disposed over the plurality of radiators, wherein the reconfigurable lens has a bottom layer that has a plurality of bottom layer holes, and a middle layer that has two middle layer sections that are separated along an azimuth axis by a gap, and wherein the reconfigurable lens has one or more beamwidth control sliders that are configurable to translate along a vertical axis, wherein the reconfigurable lens is formed of a dielectric material. By translating the beamwidth control sliders, one can adjust the azimuth beamwidth of the radiators. This may be done remotely after the antenna is deployed, to adjust for optimal beamwidth in the presence of interferers.

An antenna feed network includes an asymmetric annular waveguide coupled between first and second cylindrical waveguides. The asymmetric annular waveguide is configured to transform a linearly polarized signal propagating in the first cylindrical waveguide into a circularly polarized signal propagating in the second cylindrical waveguide.

An antenna feed network includes an asymmetric annular waveguide coupled between first and second cylindrical waveguides. The asymmetric annular waveguide is configured to transform a linearly polarized signal propagating in the first cylindrical waveguide into a circularly polarized signal propagating in the second cylindrical waveguide.

A radio frequency (RF) waveguide device fabricated by additive manufacturing is provided that includes a RF channel comprising a wall and a RF component comprising an unsupported span extending from the wall of the RF channel. The unsupported span can include at least one unsupported surface extending from the wall at an oblique angle relative to the wall. The RF component formed in this manner with additive manufacturing does not negatively impact the RF performance of the RF waveguide.