Abstract: A compressive receiver of the type having a dispersive delay line is provided by an additional mixer which is responsive to the compressive receiver's local. oscillator and to an additional RF input. The output of the additional mixer is delayed and applied to the input of the dispersive delay line. The output of the dispersive delay line is divided, one of the divided outputs being delayed. The delayed output and the other dividend output are compared in a comparison circuit. The compressive receiver may be advantageously used as a direction finding or side lode cancelling compressive receiver.

Abstract: A modified branch line coupler amplitude equalizer circuit employing cross arms and branch lines of varying lengths and impedances to minimize the return loss of the circuit.

Abstract: The present invention is an anisotropically loaded helix assembly for use in a traveling-wave tube, and the corresponding method for making the same. The present invention includes a helix circuit concentrically supported within a conductive cylindrical housing by a plurality of dielectric support members. The present invention effects an improved efficiency and bandwidth in the performance of TWT by the material used to form the dielectric support members, the shape of the dielectric support members and the manner by which the anisotropic load is affixed to the dielectric support members.

Abstract: A power amplifier for microwave frequencies utilizes a FET device operating from a common voltage source. The voltage source has the positive terminal coupled to the drain electrode of the FET. The gate electrode of the FET is adapted to receive a RF signal while the source electrode of the FET includes a voltage limiting diode that is in parallel across the source impedance. In operation the extra current required from the voltage source during power amplification is passed through the diode and the FET source bypass capacitor. This results in the FET source voltage remaining relatively constant to enable improved power and gain operation.

Abstract: A helmet mounted night vision device for a pilot that is automatically propelled away from the pilot before the pilot ejects from an aircraft, thereby preventing injury to the pilot caused by the night vision device striking the ejecting pilot. In a preferred embodiment, the present invention night vision device is a binocular device, having a right optical assembly and a left optical assembly that are viewed by the right and left eyes of the pilot, respectively. The right and left optical assemblies are each attached to elongated arm members. Each of the arm members, supporting the optical assemblies, are pivotably coupled to a common mounting plate that is removably attachable to the helmet of the pilot. Prior to ejection, the left and right optical assemblies are joined in front of the eyes of the pilot, thereby forming the binocular device.

Abstract: An equalizer circuit for equalizing RF frequencies implemented as an MMIC or MIC having a series of microstrip transmission lines between an RF input terminal and an RF output terminal and having at least one shunt path comprised of a series combination of a FET able to be switched between a conducting state and a nonconducting state and a stud tuner microstrip transmission line, wherein the FET is used as a voltage variable resistor to selectively de-Q the stub tuner and thereby control the depth of the equalization curve. In a modified embodiment, artificial transmission lines which include a plurality of inductive elements and FETs are coupled to each shunt path, wherein the shunt paths may be selectively shorted by changing the state of the FETs, thereby permitting the center frequency of the equalizer circuit to be shifted as well.

Abstract: A thin film, intagliated phosphor screen structure includes an optical fiber bundle in which each of the fibers has its glass core etched below the level of its cladding sheath at the internal surface of the screen, and a phosphor layer is deposited as a thin film which fills in the core recesses. Preferably, the upper surfaces of the phosphor layers are formed with a spherical or parabolic shape, which is obtained by surface tension when the phosphor film is annealed. The upper surfaces of the phosphor layers may also be finished by polishing. An aluminum reflective layer may also be coated on the phosphor layer. The bottom walls of the cores are preferably etched to be convex or concave to provide a lens effect. The intagliated phosphor screen can transmit 90% to 95% or more of the light generated in the phosphor layers, for an output gain factor of 5 or more over conventional phosphor screens.

Abstract: An apparatus and corresponding method for converting static data, obtained for a simulated theoretical logic circuit, into a dynamic visual display. The present invention selectively reads static simulated data produced for a theoretical logic circuit, divides the data into smaller time intervals, synchronizes the time intervals and recursively converts the data contained in each time interval into a graphical waveform image. The waveform images are recursively updated in real-time, thereby creating a dynamic visual display for the waveform.

Abstract: A negative electron affinity device has acceptor dopant concentration increased proximate the emitter face of the III-V semiconductor layer and within the depletion zone effected by an overlying CsO negative electron affinity coating. Methods to accomplish dopant concentration include diffusion, ion implantation and doping during crystal growth.

Abstract: An image intensifier tube that utilizes a photoresponsive layer for producing electrons in response to received radiation, a solid state electron amplifier for multiplying the electrons produced by the photoresponsive layer, a cold cathode for emitting electrons into vacuum, and a phosphor screen for converting impinging electrons into a visible image. The solid state electron amplifier is formed as a semiconductive layer interposed in between a photoresponse layer and a negative electron affinity layer on the photocathode. The solid state electron amplifier receives the electrons produced by the photoresponsive layer, multiplies the electrons and directs the electrons to the negative electron affinity layer. The negative electron affinity layer then directs the electrons through a vacuum to the phosphor screen producing a viewed image.

Abstract: An optical device for reorienting an optical image from a first optical pathway to a second optical pathway and the method of manufacturing such an optical device. In a preferred embodiment, a housing is provided that defines at least two optical pathways. Both optical pathways align with a common aperture in the housing. Since both optical pathways are generally cylindrically shaped and the common aperture aligns with both optical pathways, the common aperture is elliptical in shape so as to correspond to the plane of intersection between the two cylindrical pathways. A generally rectangular mirror, that is larger than the elliptical aperture in the housing, is placed over the aperture on the exterior of the housing. As a result, the mirror covers the area of the elliptical aperture and redirects any light passing through the elliptical aperture from one of the optical pathways into the other optical pathway.

Abstract: The present invention is an anisotropically loaded helix assembly for use in a traveling-wave tube, and the corresponding method for making the same. The present invention includes a helix circuit concentrically supported within a conductive cylindrical housing by a plurality of dielectric support members. The present invention effects an improved efficiency and bandwidth in the performance of TWT by the material used to form the dielectric support members, the shape of the dielectric support members and the manner by which the anisotropic load is affixed to the dielectric support members.

Abstract: A speaker verification system which accepts or rejects the claimed identity of an individual based on analysis and measurements of the speaker's utterances. The utterances are elicited by prompting the individual seeking identification to read test phrases chosen at random by the verification system composed of words from a small vocabulary. Nearest-neighbor distances between speech frames derived from such spoken test phrases and speech frames of corresponding vocabulary "words" from previously stored utterances of the speaker seeking identification are computed along with distances between such spoken test phrases and corresponding vocabulary words for a set of reference speakers. The claim for identification is accepted or rejected based on the relationship among such distances and a predetermined threshold value.

Abstract: A capacitor element for an integrated circuit comprises a thin layer of dielectric material laminarly disposed between first and second layers of electrically conductive material. Each of the layers has n sides, where n is an even intergergreater than four. Preferably, each layer of the capacitor, and therefore the capacitor itself, is shaped as an equiangular polygon. Although, the capacitor may be configured as a hexagon, a decagon, etc., an octagonal configuration is preferred. By eliminating the 90 feed bend, substantial reductions in discontinuity reactances are obtained.The capacitor element may be provided as an element of a hybrid or a monolithic circuit. When the capacitor element is employed as an element of a microwave circuit, the first conductive layer is deposited on a substrate of a semi-insulating material such as gallium arsenide.

Abstract: The photocathode of an image intensifier is pulsed ON and OFF at a rate determined by a thyristor or SCR having the anode to cathode path coupled to the photocathode and the gate electrode triggered by a variable resistor, capacitor (RC) circuit to cause the photocathode to draw or conduct current only during the OFF interval of the SCR. During the ON interval of the SCR, the photocathode is OFF or non-conducting, wherein the controlled image intensifier tube exhibits a relatively constant resolution over a wide range of input light input values as from 10.sup.-6 to 10.sup.1 foot-candles.

Abstract: The present invention is a periodic permanent magnet (PPM) assembly used to produce a focussing field within an electron tube, and the corresponding method of manufacturing the same. The present invention PPM includes producing two opposing semi-cylindrical stacks by alternately stacking semi-annular shaped magnets and pole pieces. Once the two semi-cylindrical stacks are formed, they are joined around the electron tube, such that the various pole pieces and magnets of the two semi-cylindrical stacks align. As a result of the joining of the two semi-cylindrical stacks, a cylindrical periodic permanent magnet assembly is formed around the electron tube in a cost effective and labor efficient manner.

Abstract: The present invention is a mounting assembly for mounting a night vision apparatus onto a standard army issue helmet. The present invention includes a support member for retaining the night vision apparatus and a clamping assembly used to join the support member to the helmet. The clamping assembly is removably attachable to a standard army issue helmet above the eyes of the wearer. The support member is pivotably connected to the clamping assembly in a manner that enables the support member to be pivotably rotated about the clamping assembly between an operational position and a stowed position. At the operational position, the support member retains the night vision apparatus in front of the eyes of the wearer. At the stowed position, the night vision apparatus is "flipped up" to a position above the field of view of the wearer, where the night vision apparatus can be retained until again needed.

Abstract: A negative electron affinity device has acceptor dopant concentration increased proximate the emitter face of the III-V semiconductor layer and within the depletion zone effected by an overlying CsO negative electron affinity coating. Methods to accomplish dopant concentration include diffusion, ion implantation and doping during crystal growth.

Abstract: An automation system for assembling photocathodes into vacuum tube housings so as to produce vacuum tube assemblies. Photocathodes are loaded, cleaned and otherwise processed in a first evacuated chamber. Similarly, vacuum tube housings are loaded, cleaned and otherwise processed in a second evacuated chamber. The first and second chambers are selectively interconnected wherein the photocathodes from the first chamber are transferred into the second chamber by an automated transfer mechanism. Once in the second chamber, the photocathodes are joined to the vacuum tube houses in an automation process, creating the final product vacuum tube assemblies.