Abstract:
The efficiency and brightness of particulate, crystalline phosphors of oxysulfides on lanthanum series metals activated with trivalent metals having atomic numbers from 50 to 70, such as GD2O2O:Tb crystalline phosphors, containing 0.6 mol percent Tb and particularly those also containing 0.1 to 5 mol percent Dy are increased up to 2 to 3 times by treating the phosphors in a H2/SO2 atmosphere at a temperature from 750 C to 1,250 C for 15 minutes to 3 hours. Life tests have shown no decrease in brightness after 1,000 hours of tube operation.
Abstract:
An electronically scanned array antenna (18) useful for millimeter wavelength energy. The antenna comprises a fully ferrite (21) loaded square or round waveguide (20) having radiating apertures (22) spaced along part of its length. Rf energy is circularly polarized (26) in the waveguide. The phase velocity of the wave is controlled by applying a longitudinal magnetic field to the ferrite to produce a controllable linear progressive phase of the energy radiated from the apertures (22) to form a beam in the desired direction. The phase control (28) is of a latching type using flux drive. The particular structure of the invention enables combining a plurality of branching array elements (66) with a feed element (68) to form an array capable of two dimension beam scanning.
Abstract:
A multi-gate field effect transistor (102) having source (111) and drain (109) regions and a plurality of active channels (104a, b) extending therein between. A plurality of gates (116, 120), each having a corresponding like plurality of gate contacts (114a, b, 118a, b) commonly overlying the active channels (104a, b), are provided to control the flow of charge carriers between the source (111) and drain (109) regions. The gate contacts (114a, b, 118a, b) are uniquely ordered and correspondingly positioned with regard to each of the active channels (104a, b) so that each of the gates has a substantially symmetric electrical characteristics in controlling the flow of charge carriers.
Abstract:
A DC-to-DC up-converter (41) of the type wherein voltage is built up across a capacitor (17) by alternately connecting a coil (19) by means of a pulse width modulator-controlled switching transistor (23) across a low DC voltage source (13') and, in series with that source, across the capacitors (17). Operation is initiated by converting the switching circuit into a blocking oscillator, running the oscillator from the low DC voltage source, and using the up-converted voltage to power the rest of the up-converter, making it possible to run the entire up-converter circuit from a very low voltage source.
Abstract:
A high-density MOSFET (10) having field oxide (24) self-aligned channel stops (26, 27) for device isolation and an optimal method of fabricating such a device. The process provides channel stops (26, 27) underlying and aligned with the edges of a field oxide layer (24) and allows the dopant concentration of the channel stops (26, 27) to be established separately from that of the active device channel region (16) by use of an independent channel stop implant. The active devices (10) thus formed require minimal isolation area, have a high field threshold voltage, a low junction capacitance, and minimal body effect. They are particularly useful in high-speed, high-performance integrated circuits.
Abstract:
A high density CMOS device structure (6) that is essentially immune to latch-up, and a method of fabricating the structure (6). This is obtained by providing a well region (14) within and adjacent a surface of a substrate (12), the well region (14) having a multiple retrograde doping density profile, and by providing source and drain regions (18, 20) within the well (14) and adjacent the surface of the substrate (12), the source and drain regions (18, 20) having associated therewith a greater than average density of residual defects within said well region (14), the greater density of residual defects being generally associated with the deepest portions of the source and drain regions (18, 20) and the immediately underlying portions of said well region (14), respectively.
Abstract:
A process for depositing on the surface of a substrate a layer of a chosen material having continuous gradations in refractive index in a predetermined periodic pattern. The substrate is exposed to two vapor phase reactants which react upon radiation-inducement to produce the chosen material, and the relative proportion of the reactants is varied in a predetermined and continuous sequence to produce continuous gradations in the stoichiometric composition and refractive index of the deposited layer as a function of thickness. Additionally, predetermined changes in refractive index and/or thickness across the horizontal surface of the substrate may be produced in combination with the change in refractive index as a function of thickness. Diffraction optical elements formed by such a process include various optical filters and reflective optical coatings.
Abstract:
Shutter (30) produces a pulsed emission from a beacon. Hot plate (40) radiates upward through openings (67). Shutter plate (52) slides to open and close the view of the hot plate. Outer optical plate (38) has divergent and adjoining reflector openings (67) so that a large area source is seen when the shutter is open.
Abstract:
A two-axis gyroscope in which precession may be effected by application of a DC current to the stationary precession windings (16). The rotor assembly (22) has a pair of ring-shaped permanent magnets (18, 20) with their magnetic vectors aligned parallel with the gyro spin axis. This structure presents a magnetic field to the precession windings (16) which does not change as the rotor assembly rotates. Thus the gyroscope may be precessed by application of a DC current to the precession windings. The precession windings are located along two orthogonal axes to allow precession of the gyro in two orthogonal directions.
Abstract:
A dual band, phased array antenna especially adaptable for tactical radar capable of performing search, track and identification in a hostile jamming environment. The dual band array antenna is essentially two antennas sharing a common antenna aperture. The two antennas possess separate feed system and beam steering control. Thus, the beams for each frequency band can be steered independently and simultaneously. This design utilizes an ultra-wide band radiating element which can operate over approximately an octave bandwidth encompassing two adjacent microwave bands. In particular, the dual band signals can be received efficiently by the radiating element. A dual band coaxial-to-waveguide transition can be used to carry the signals to a diplexer. The dual band signals are separated at the diplexer and can be processed in separate feed networks. The advantages of this dual band phased array technique include not only good impedance characteristics but also the absence of grating lobe formation and cross coupling problems.