An UC dielectric waveguide of the embodiments includes: a dielectric substance wiring propagating a terahertz wave; and a medium disposed around the dielectric substance wiring and having a large refractive index difference with respect to the dielectric substance wiring. A THz circuit of the embodiments includes a dielectric substance THz circuit connected between a first and second UC dielectric waveguides. The dielectric substance THz circuit includes a circuit including a linear-shaped UC dielectric waveguide, a bent-shaped UC dielectric waveguide, and a Y-coupled branch circuit. There are included a first holding unit holding the first UC dielectric waveguide and a second holding unit holding the second UC dielectric waveguide. The THz circuit of the embodiments may include a 2×2 evanescent coupler. Provided is a THz circuit having mechanical strength obtained by applying the UC dielectric waveguide having high confinement and transmission efficiencies of THz waves with a simple structure.

According to various embodiments, systems and methods for spatial sampling in proximity to the Nyquist limit in traveling-wave antenna systems are disclosed. An apparatus can include a traveling-wave antenna array comprising a plurality of adjacent traveling-wave antennas that each include a plurality of tunable elements that are spaced at, near, or above a Nyquist limit spacing to form an array of tunable elements. The apparatus also includes a phase diversity feed coupled to the traveling-wave antenna array that is configured to provide input to the traveling-wave antenna array including phase diverse input to two or more of the plurality of adjacent traveling-wave antennas. Further, the apparatus includes a plurality of grayscale tuning elements configured to tune the plurality of tunable elements along one or more ranges of one or more tuning variables to form one or more specific output radiation patterns through the traveling-wave antenna array based on the input.

The invention relates to a multifilar helix antenna (1) comprising a wave feed and polarizing section (2) comprising a cover portion (3) comprising a through opening (4). The antenna (1) comprises a helix radiator (5) comprising three or more resonant helical elements (6) evenly distributed about an imaginary circle. Each helical element (6) extends in a longitudinal direction (Z) from the feed and polarizing section (2) through the opening (4) in the cover portion (3) and wound to form the helix radiator (5). Each helical element (6) comprises one or a plurality of wave perturbations (7) separated in the longitudinal direction (Z) and that each set of perturbations are positioned at the same level in the longitudinal direction (Z) to yield an equivalent array of stacked helical radiators, wherein the cover portion (3) comprises a rotationally symmetric corrugated assembly (8).

A leaky travelling wave array of elements provide a broadband radio frequency antenna.

A leaky travelling wave array of elements provide a broadband radio frequency antenna.

A tapered Microstrip Leaky Wave Antenna (MLWA) may include: a grounded metallic plane; conducting traces disposed on the grounded metallic plane, the conducting traces may include: a tapered leaky section extending in a first direction from a first end of the tapered leaky section to a second end of the tapered leaky section, the tapered leaky section including two rectangular slots; and a monopole disposed at the second end of the tapered leaky section and extending in a second direction, the second direction crossing the first direction, a dielectric layer disposed between the grounded metallic plane and the conducting traces; and three Yagi elements disposed adjacent to at the second end of the tapered leaky section in parallel with the monopole.

A tapered Microstrip Leaky Wave Antenna (MLWA) may include: a grounded metallic plane; conducting traces disposed on the grounded metallic plane, the conducting traces may include: a tapered leaky section extending in a first direction from a first end of the tapered leaky section to a second end of the tapered leaky section, the tapered leaky section including two rectangular slots; and a monopole disposed at the second end of the tapered leaky section and extending in a second direction, the second direction crossing the first direction, a dielectric layer disposed between the grounded metallic plane and the conducting traces; and three Yagi elements disposed adjacent to at the second end of the tapered leaky section in parallel with the monopole.

According to various embodiments, systems and methods for suppressing grating lobes in a traveling-wave antenna system are disclosed. An apparatus can include a traveling-wave antenna array comprising a plurality of adjacent traveling-wave antennas. The apparatus also can include a phase diversity feed coupled to the traveling-wave antenna array. The phase diversity feed can be configured to provide phase diverse input to two or more of the plurality of adjacent traveling-wave antennas.

A steerable, high-power microwave antenna includes: a forward-traveling, leaky-wave feed antenna; a trans-reflecting conical-sectional reflector disposed spaced-apart and above said leaky-wave feed antenna and having a conical surface facing said leaky-wave feed antenna and formed of a plurality of electrical conductors held in parallel order in a grill; and a twist-reflector pivotally mounted opposite and spaced-apart from said conical surface of said trans-reflecting conical-sectional reflector. The twist-reflector is adapted to receive microwave energy reflected to it from said conical surface of said trans-reflecting conical-sectional reflector and to rotate the polarization of said microwave energy and reflect said microwave energy back to said trans-reflecting conical-sectional reflector for passing through said trans-reflecting conical-sectional reflector and forming a narrow, pencil-like beam of high energy radiation in polarized form extending outward from said conical surface of said trans-reflecting conical-sectional reflector.

A steerable, high-power microwave antenna includes: a forward-traveling, leaky-wave feed antenna; a trans-reflecting conical-sectional reflector disposed spaced-apart and above said leaky-wave feed antenna and having a conical surface facing said leaky-wave feed antenna and formed of a plurality of electrical conductors held in parallel order in a grill; and a twist-reflector pivotally mounted opposite and spaced-apart from said conical surface of said trans-reflecting conical-sectional reflector. The twist-reflector is adapted to receive microwave energy reflected to it from said conical surface of said trans-reflecting conical-sectional reflector and to rotate the polarization of said microwave energy and reflect said microwave energy back to said trans-reflecting conical-sectional reflector for passing through said trans-reflecting conical-sectional reflector and forming a narrow, pencil-like beam of high energy radiation in polarized form extending outward from said conical surface of said trans-reflecting conical-sectional reflector.