Abstract: Carbon nanotube-based devices that can be used to meet the growing miniaturization and performance needs of electronic systems, are provided. In particular, a transmission line and inductor that include nanotube bundles is disclosed. In a further embodiment a method for isolating nanotubes with proteins is disclosed. In another embodiment a nanoswitch using nanotubes is disclosed. In a final embodiment a low loss, high permeability material is disclosed that includes a conductive coil and a set of nanotube toroids.

Abstract: Carbon nanotube-based devices that can be used to meet the growing miniaturization and performance needs of electronic systems, are provided. In particular, a transmission line and inductor that include nanotube bundles is disclosed. In a further embodiment a method for isolating nanotubes with proteins is disclosed. In another embodiment a nanoswitch using nanotubes is disclosed. In a final embodiment a low loss, high permeability material is disclosed that includes a conductive coil and a set of nanotube toroids.

Abstract: Single and dual frequency band spatial null steering antenna arrays are disclosed, comprised of primary resonant quadrifilar helix antennas and auxiliary resonant patch antennas, which comprise stacked patches in the dual-band embodiments. Several feed networks are described for producing, preferably, circularly polarized radiation in satellite frequency bands (e.g., L1 and L2) with pattern nulls steerable to desired elevation angles. Various top and bottom-fed quadrifilar helix antennas configurations are also described.

Abstract: Single and dual frequency band spatial null steering antenna arrays are disclosed, comprised of primary resonant quadrifilar helix antennas and auxiliary resonant patch antennas, which comprise stacked patches in the dual-band embodiments. Several feed networks are described for producing, preferably, circularly polarized radiation in satellite frequency bands (e.g., L1 and L2) with pattern nulls steerable to desired elevation angles. Various top and bottom-fed quadrifilar helix antennas configurations are also described.

Abstract: Dual-band quadrifilar helix antennas, comprising four radiating elements arranged helically to define a cylinder of constant radius, each radiating element having an upper portion and a lower portion and a gap there between, each upper portion having an open end, and each lower portion having a feed point for receiving feed signals in phase quadrature. Disposed within each gap and electrically connected to each upper and lower portion is a corresponding parallel LC circuit configured to have a first impedance at a first frequency, and a second impedance greater than the first impedance, at a second frequency. Alternative embodiments include structures with ground planes and top-fed helices without ground planes.

Abstract: A low radar cross section lens antenna having high gain is disclosed. A spherical lens having a dielectric radial gradient focuses planar RF energy coupled thereto onto a focal point on the surface of a lens located diametrically opposite from the first intersection of the plane wave and the lens. The lens partially encloses a wedge shaped RF absorbing portion having the edge of the wedge passing through the center of the lens. The lens is partially surrounded by a second RF absorbing portion having a bowl-like shape. An antenna feed having its aperture located adjacent the surface of the lens is mounted to rotate about an axis lying substantially along the edge of said wedge shaped absorbing portion. Elevation rotation means is provided to rotate the feed antenna within a slot contained within the second RF absorbing portion.

Abstract: An antenna for inertialess scanning a beam through 360 degrees or any desired sector thereof. A reflector, in the shape of a truncated cone that is tangential to an imaginary sphere in the central plane of the cone, is positioned above a feed array located in the equatorial plane of the sphere. The feed array is fed by a network with a plurality of input ports, each of which corresponds to a beam in space. By successively energizing these input ports the beam is caused to scan continuously over the desired sector.

Abstract: A system for transmitting and receiving very wide instantaneous bandwidth signals. Synchronized short pulse generators are positioned at the feed location of each element of a linear array of short capped monopole antennas to sequentially excite the antenna elements which are spaced in accordance with the sequential interval to provide a beam in the desired direction and space. Reflections of the radiated short pulses are received by a feed monopole backed by a reflecting monopole and coupled to a short pulse receiver through a duplexing switch.

Abstract: A dielectric trough waveguide antenna composed of a metallic guide having a dielectric substrate covering the bottom of the guide and a plurality metal radiators placed periodically on the dielectric at the dielectric-air interface provides a low loss antenna suitable for millimeter wave applications.

Abstract: A 360 degree fan beam scanning antenna which includes a transreflector created by a plurality of reflecting elements arranged on a surface of revolution formed about a generating axis and a feed antenna rotatable about the internal focal circle of the transreflector that provides an illumination beam for the transreflector which minimizes spillover and antenna pattern skewing.

Abstract: A geothermal well power-generation system is monitored by sensors permanently associated with the operating power generation system. These sensors detect changes in well water temperature, water pressure below and above the pump, and pump rotating speed. The data obtained is transmitted to a receiver at the earth's surface via sections of the system's plumbing which are utilized as an electromagnetic transmission line.