Abstract: Superconducting persistent current rings are mass produced by passing each uperconducting ring through a tapered magnetic field that is tapered in strength so that when each ring passes through the maximum magnetic field of the tapered magnetic field which is above the critical field of the tapered magnetic field the superconducting ring becomes normal thereby admitting all of the flux to which its cross section is exposed. When the ring is passed to a region of field lower in strength than the critical field, the ring becomes superconducting again and traps the flux to which its cross section is exposed.

Abstract: An all polymer, electrochemically formed, thin film capacitor is provided thout use of any metal foil and found to yield reasonable capacitance values. The capacitor includes an electrochemically formed insulating polymer sandwiched between two electrochemically formed conductive polymers.

Abstract: Multidimensional quantum-well arrays are made by electron-beam lithographic atterning, followed by solid-state diffusion.

Abstract: A microstrip nonreciprocal latching phase shifter has a ferrite rod with ramp-shaped dielectric waveguide members at the ends thereof mounted on one surface of a microstrip dielectric substrate having a ground plane on the opposite surface thereof. The dielectric constants of the ramp members and the rod are substantially the same and the substrate dielectric constant is substantially less than the dielectric constant of the ramp members. A dielectric plate is on top of the rod. A microstrip conductor mounted on the substrate, the ramp members and the plate in axial alignment with the rod extends between the ends of the substrate. The rod has a rectangular longitudinally-extending passageway therein filled by a dielectric core insert having a dielectric constant greater than the dielectric constant of the rod. A single control wire is disposed in and aligned with the core insert.

Abstract: A microstrip antenna is improved by applying a thin coating of ferrite maial to the surface of the metal ground plane of the antenna by flame spraying or arc plasma spraying. The applied ferrite coating is not exposed to a high temperature anneal cycle.

Abstract: This disclosure relates to fiber optic connector keying arrangements which prevent the unintended mixing of traffic when a plurality of similar fiber optic cables are to be interconnected with electronic equipment handling traffic of various types and classifications. The connector assembly at each end of a fiber optic cable comprises a hermaphrodite connector end plug (i.e., a keying insert) that has an end face configuration which is unique to that particular cable. The equipment (bulkhead) connector assembly to be connected to a given cable also includes a keying insert end plug which is identical to that of the cable. Thus, a given cable connector can be connected or coupled to, and only to, a similarly configured, bulkhead, connector assembly. Each cable comprises at each end a unique, keying insert, end plug and, therefore, each cable can be connected to only one similarly configured, bulkhead connector; and, undesirable connections, and consequent traffic mixing, are thereby precluded.

Abstract: A cathode is made from a mixture of tungsten and aluminum powders.

Abstract: A circuit is shown for representing the internal temperature of a crystal, through a combination of certain harmonic frequencies excited in that crystal. By forming a signal which is equal to nF.sub.A -F.sub.B, i.e., n times a lower harmonic frequency minus F.sub.B, an nth harmonic frequency, or F.sub.A -1/n F.sub.B, e.g., it is possible to have a signal which is near linearly dependent upon temperature which can be used in representing same. This composite signal is also seen to be highly sensitive to temperature changes yielding an improved thermometric system as compared to conventional systems.

Abstract: An oscillator and a resonator included in the oscillator are operated at a requency that is not the resonator frequency but that is off resonance at a frequency where the resonator has a minimum acceleration sensitivity and the desired oscillator output frequency is then electronically produced using electronic frequency synthesis techniques.

Abstract: A magnesium/manganese dioxide electrochemical cell that has been stored fowing partial usage is improved by increasing the cathode moisture content at the time of making the cell to reduce the self discharge and increase the operating capacity after the cell has been stored following partial usage.

Abstract: A microwave mixer suitable for millimeter wave radar applications. A semi-insulating gallium arsenide dielectric waveguide structure contains an embedded planar doped barrier (PDB) structure as a non-linear mixing element. The local oscillator (LO) signal is guided to the PDB structure via a coplanar type waveguide. The radio frequency (RF) signal is guided to the PDB structure via an image guide and a microstrip circuit serves to transmit the intermediate frequency (IF).

Abstract: A method is provided of making a millimeter wave monolithic integrated ciit that allows for device isolation during epitaxial growth and integral heat sink with supporting circuitry on the substrate.

Abstract: Optical fibers are used in a utility piping system containing oil, water or as by coating the fibers after drawing with an inorganic hermetic coating which is impervious to both moisture and whatever fluid is contained in the system. The hermetic coating permits the fibers to undergo the mechanical stresses encountered during insertion in the piping system without causing degradation of either the mechanical or optical performance of the fibers.

Abstract: A high gain, primary receiving antenna and a single scannable auxiliary lar antenna array are utilized. The auxiliary linear array is coupled to means for forming multiple directive narrow receiving beams simultaneously on the auxiliary array, each of which are scanned over an assigned segment of space to locate and isolate a respective one of a plurality of interfering or jamming signals which are also contained in the signal received by the primary antenna. The interfering signals are cancelled by separately adjusting the phase and amplitude of each one of the interfering signals received and then feeding them to a respective signal subtractor coupled to the output of a receiver connected to the primary antenna.

Abstract: Interference signal cancelling is provided by a multiplexed interference celling system that utilizes a primary high gain antenna and an auxiliary antenna pair including a low gain notch antenna in conjunction with a low gain omnidirectional antenna. The output of the two low gain auxiliary antennas are subtracted from each other to provide an output that is substantially free of all input signals except for the interfering signal received in the narrow notch of the notch antenna. This signal is then subtracted from the composite output signal of the primary antenna. One of these auxiliary antenna pairs is employed for each separate jamming signal source to be cancelled, thus enabling each jamming signal to be orthogonally isolated, whereupon its magnitude and phase is then adjusted to be equal to and 180.degree. out of phase with the same component contained in the composite signal from the primary antenna.

Abstract: A planar monolithic self-oscillating mixer for millimeter wave applications s formed on a gallium arsenide substrate. A via hole extends from the bottom surface to the top surface of the substrate. Metal is plated on the bottom surface of the substrate and in the via hole forming a heat sink. Above the heat sink are disposed three gallium arsenide layers--an N layer between two N.sup.+ layers. The top layer has a metal connection formed thereon. The gallium aresenide layers are epitaxially deposited using vapor phase techniques. Unwanted portions of these layers are mesa etched away. A radio frequency microstrip transmission line is disposed on the upper surface of the substrate. This transmission line is gap coupled to the Gunn diode and extends to one edge of the substrate. An intermediate frequency microstrip transmission line is connected to the metal connection on the top N.sup.+ layer.

Abstract: Utilizing sections of charged transmission line cables and optically-actied semiconductor switches, the direct generation of high power RF is demonstrated.

Abstract: The surface of a substrate is passivated by the introduction of a thin la of (Hg,Cd)Te, of increased Cd content, on the substrate surface before the growth of the desired composition of (Hg,Cd)Te.

Abstract: A method of indicating the state of charge of a battery is provided wherein a LED clock electrically connected to the battery operates each time current passes through the battery and stops when there is no battery current; the clock retaining the amount of time already passed so that resumed battery operation again activates the clock to continue counting.

Abstract: An optical quality film is transferred from a master optical surface to a condary substrate by means of a replication technique using a master optical surface as a mold.