Abstract: A phased array antenna is made up of linear arrays. Each of the linear arrays has a printed circuit board spine. Split waveguides are formed from two symmetrical portions conductively joined to ground on opposite sides of the printed circuit board spine. Planar transmission line-to-waveguide transitions are mounted on the printed circuit board spine within the split waveguides. Phase shifter/TTD devices are mounted on the circuit board spine within the split waveguides for steering the phased array antenna beam. Bias and control circuitry is etched on the circuit board spine for biasing and controlling the phase shifter/TTD devices. The phased array antenna may be made up of the linear arrays combined into a two-dimensional array and fed with a waveguide feed or a printed feed manifold attached to the printed wiring board spine.

Abstract: Solvent-resistant polybenzimidazole membranes, methods of making them and crosslinking them and composite membranes and hollow fiber membrane modules from them are disclosed.

Abstract: An electronically scanned slotted waveguide antenna radiates an RF signal as a scannable beam. The antenna has radiation waveguides positioned in an array. Radiation slots in the radiation waveguides radiate the scannable beam. A feed waveguide is coupled to the radiation waveguides. The feed waveguide feeds the RF signal to the radiation waveguides through coupling slots. The feed waveguide has sidewalls with tunable electromagnetic crystal (EMXT) structures thereon. The EMXT structures vary the phase of the RF signal in the feed waveguide to scan the radiated beam in one dimension. The radiation waveguides may also have tunable EMXT structures on the sidewalls to vary the phase of the RF signal to scan the radiated beam in a second dimension. The EMXT structures may be discrete EMXT devices or a EMXT material layer covering the feed and radiation waveguide sidewalls.

Abstract: A phased array antenna is formed from an array of apertures having walls containing phase shifter devices for phase shifting and beam steering a radiated beam of the phased array antenna. The phase shifter devices are interconnected with an interconnect structure formed from substrate slats that form the walls of the apertures. The substrate slats may be thin film circuitized column slats having a metal substrate, dielectric layers, metal bias/control circuitry, a shielding layer, and circuit terminations to connect to a phase shifter device attached to the substrate slat.

Abstract: A method of forming a conformal electronic scanning array (ESA) is disclosed. The ESA is formed using rolling techniques similar to those used in forming LCD displays. If the layers forming the ESA are made of substantially transparent materials, the ESA may be applied to an outer surface of a display, such as a flexible display. The ESA may also be applied to a window or other non-planar surface such as an outer surface of a vehicle, or may be integrated into a computer display.

Abstract: A phased array antenna with an egg crate array structure is formed from metallic row slats that form a floor and ceiling of each array element. Column slats with slots engage the row slots to form the egg crate array structure. EMXT devices are located on the column slats such that a pair of EMXT devices form array element walls. The column slats are formed from U-shaped column strips configured such that a left side of the U-shape forms a left-hand side of each array element in a column and a right side of the U forms an opposing right-hand side. The column strips sides are mounted back-to-back with sides of adjacent column strips to form the column slats. Circuit devices for operation of the antenna are mounted on the U-shaped column strip and a connector is mounted at an apex of the U-shaped column slat.

Abstract: A reflectarray antenna with a scanned radiated beam has an antenna feed for radiating a wave. A reflecting surface excited by the wave is reflected from a reflecting surface located on a tunable substrate in accordance with a variable surface impedance of the tunable substrate modulated to scan the radiated beam. The tunable substrate surface impedance is varied by modulating the dielectric constant or the permeability. The tunable substrate may be an electromagnetic band gap (EBG) material electromagnetic crystal (EXMT) structure to vary the surface impedance. The reflecting surface may be located on short-circuited waveguides with a variable surface impedance modulated to scan the radiated beam by adjusting phase shifts of the waveguides with tunable substrate phase shifter located in the waveguides or by adjusting the position of a piezoelectric movable short.

Abstract: A controlled release delivery composition which can be administered to a high fat use environment such as the human gastrointestinal tract following a high fat meal. The delivery composition is embodied as a core surrounded by an asymmetric polymeric membrane. In a preferred embodiment, the asymmetric polymeric membrane is cellulose acetate.

Abstract: A weather radar antenna for radiating a desired beam formed by feeding quadrants of the antenna uses a dual-mode switched aperture antenna feed. The dual-mode switched antenna feed has an input divider that splits the input signal. A left switch switches the split input signal using a left first diode and a left second diode to top left and bottom right quadrants of the antenna. A right switch switches the split input signal using a right first diode and a right second diode to top right and bottom left quadrants of the antenna. The diodes are forward and reverse biased as required to feed top, bottom, left and right portions of the antenna to obtain the desired beam. When all the diodes are reversed biased the split signal is fed to all quadrants of the antenna.

Abstract: Solvent-resistant polybenzimidazole membranes, methods of making them and crosslinking them and composite membranes and hollow fiber membrane modules from them are disclosed.

Abstract: A multi-band phased array antenna for radiating low frequency band signals and high frequency band signals. The multiband phased array antenna is formed from unit cells having waveguides for radiating high frequency band signals and end-fire radiating elements for radiating low frequency band signals. The unit cells have four walls with an open input end and an open radiating end. End-fire radiating elements are disposed on inner surfaces and outer surfaces of the four walls and radiate out the radiating end. Four waveguides are disposed together to radiate into the input end of the low frequency assembly.

Abstract: Solvent-resistant polybenzimidazole membranes, methods of making them and crosslinking them and composite membranes and hollow fiber membrane modules from them are disclosed.

Abstract: Solvent-resistant polybenzimidazole membranes, methods of making them and crosslinking them and composite membranes and hollow fiber membrane modules from them are disclosed.

Abstract: A pharmaceutical composition comprises a dispersion comprising a low-solubility drug and a matrix combined with a concentration-enhancing polymer. At least a major portion of the drug is amorphous in the dispersion. The compositions improve the stability of the drug in the dispersion, and/or the concentration of drug in a use environment.

Abstract: In one aspect, pharmaceutical compositions comprising dispersions of an acid-sensitive drug and a neutral dispersion polymer are disclosed. The acid-sensitive drug has improved chemical stability relative to dispersions of the drug and acidic polymers. In another aspect, pharmaceutical compositions of low-solubility drugs and amphiphilic, hydroxy-functional vinyl copolymers are disclosed.

Abstract: Pharmaceutical compositions comprised of low-solubility and/or acid-sensitive drugs and neutralized acidic polymers are disclosed.

Abstract: A system for deploying a wireless LAN in a battlefield which includes a quasi-cylindrical antenna/housing which is adapted to be positionally unstable in orientations where the antenna would be non-operational.

Abstract: A high-isolation polarization diverse circular waveguide orthomode feed apparatus capable of supporting any arbitrary linear, right-hand circular, left-hand circular or elliptically polarized electromagnetic wave with desirable performance over a broad range of frequencies and small size is disclosed. The waveguide feed employs the combination of a circular waveguide segment, stepped septum polarizer, and a novel arrangement of diametrically opposed electric field probes in the bifurcated region of the circular waveguide segment to achieve low crosspolarization when operating in arbitrary linear mode and high-isolation for rejection of undesired cross-polarization components when operating in circular or elliptical polarization mode. This apparatus is an elegant, simple, compact, rugged, and cost effective design that is applicable to a broad family of microwave antennas, but in particular those required to meet minimal radome swept volume requirements.

Abstract: The present invention is directed generally to phased array antennas. The invention allows for the realization of a low-cost, ferroelectric material loaded feed manifold for phase shifting an antenna. This type of architecture can take many forms, with the preferred embodiment being waveguide. In an embodiment of the present invention, the Ferroelectric/Paralectric/Composite material loaded feed manifold described herein may solve the space/weight problem by integrating the material into the traditional waveguide feed manifold. A feed structure suitable for receiving and routing electromagnetic energy may include a subassembly including material suitable for shifting phase of electromagnetic radiation when an electrical field is applied. Material having a dielectric constant at least one of equal to and greater than the phase shifting material may also be included.

Abstract: A high-isolation broadband polarization diverse circular waveguide feed apparatus capable of supporting any arbitrary linear, right-hand circular, left-hand circular or elliptically polarized electromagnetic wave with desirable performance over a broad range of frequencies and small size is disclosed. The waveguide feed employs the combination of a symmetrical shaped conical frustrum waveguide and circular waveguide segments together with a novel arrangement of orthogonal and nonplanar electric field probes and radio frequency impedance posts to achieve broad bandwidth, low cross-polarization when operating in arbitrary linear mode, and high-isolation for rejection of undesired cross-polarization components when operating in circular or elliptical polarization mode. Details of a 10.95-12.7 gigahertz embodiment of the waveguide feed including dimensions are provided.