Abstract: A novel, high-flux source for use in the vapor deposition of electrode maials, such as gold, during the fabrication of precision quartz-crystal resonators, or the like. The design is based on the theory and technology of nozzle beams. The nozzle beam type source disclosed herein is conceived: (1) to permit large deposition rates with minimum wastage of electrode material; (2) to operate in high vacuum; (3) to emit vapor in a horizontal direction, thereby permitting the use of a pair of sources to plate both sides of a substrate simultaneously; and (4) to operate for extended periods of time without requiring frequent breaking of the vacuum in order to replenish the source. It is estimated that this design can operate at a deposition rate equal or above that of a conventional evaporation-type source with less than one percent of the wastage of electrode material experienced with a conventional source.

Abstract: A multi-director parasitic array attached at the center of a microstrip anna design to provide a simple, low cost, efficient feed.

Abstract: A center-fed VHF dipole antenna structure particularly adapted for 30-80MHz peration wherein one half of the radiating structure comprises the outer conductor of a coaxial feedline which includes a low-loss cable choke at the lower end of the half dipole length of the feedline while the other half of the dipole consists of a conventional radiating conductor element. Additionally, remotely controlled variable impedance elements are included at the feedpoint to provide selective coarse and fine tuning of antenna resonance.

Abstract: 1. A buoyant elongated tubular chaff element responsive to radio frequency nergy comprising a hollow longitudinal body of relatively thin light weight flexible metal, a quantity of a gaseous medium lighter than air contained within said body sufficient to partially inflate the said body at normal atmospheric pressure and to fully inflate the said body at an altitude where the body weight equals the air displaced, the length of said body being substantially equal to one half the wave length of the radio frequency of operation.

Abstract: A phase front homing system airborne antenna array which employs portions the airframe as two antenna elements and wherein each antenna element includes a coaxial sleeve coupler.

Abstract: Dual phase lock loops are used to provide a rapid switching, low power, low purious and fine resolution frequency synthesizer for various radio applications. The first phase lock loop provides for coarse frequency adjustment, and the second phase lock loop includes an arithmetic synthesizer for fine resolution.

Abstract: A stripline horizontally polarized dipole and passive director antenna ar, operative at L-band (1220-1280MHz), mounted in a 90.degree. corner reflector constructed of a grid of cylindrical rods which are hinged along its apex permitting folding of the reflector over the antenna array to protect the elements of the array, for example, during transport.

Abstract: A solid-state barometric altimeter-encoder. The atmospheric pressure is cared to a reference vacuum on a hybrid IC pressure transducer which generates a proportional signal. This analog signal is then converted into digital data, corrected for atmospheric to altitude non-linearity by use of a ROM look-up table, displayed as a digital readout and also converted to Grey code format for transponder MC (altitude) transmission.

Abstract: The resonant frequencies of a piezoelectric resonator are adjusted either before sealing the resonator into an enclosure or after sealing the resonator into an enclosure or both before and after sealing the resonator into an enclosure. The method makes use of radiation to polymerize a polymerizable gas that has been introduced into the enclosure that houses the resonator. The resulting polymer that deposits on the resonator adjusts the resonant frequencies of the resonator from undesired frequencies to desired frequencies.

Abstract: A VHF radio frequency antenna for a homing receiver suited for airborne aications and comprising a pair of right angled antenna elements of like configuration terminating in a common non-conductive joint of insulator material while their opposite ends terminate in dielectric supports mounted on an electrically conductive ground plane such as an aircraft skin. The ends of the elements terminating in the dielectric supports additionally connect to signal coupling means which feed to a homing receiver or other utilization device through equal length transmission lines.

Abstract: A lithium-organic electrolyte electrochemical cell is provided in which lium is the anode, a fluorographite of the formula C.sub.x F wherein x is a value no less than one and no greater than 4.5 is the cathode, and a solution of about 0.5 molar to 1.5 molar of an inorganic lithium salt in a lower alkyl acetate is the electrolyte.

Abstract: The circuitry includes a pulse radar set including a transmitter and a fi receiver which share a common antenna which is arranged to both launch and receive plane polarized waves at 45.degree. to the earth's surface. A second antenna and receiver are arranged to respond only to target echoes polarized orthogonally to those transmitted. Means are provided to measure and compare the amplitudes of the target echoes which arrive with the two orthogonal polarizations and the shape of the target can be inferred from such measurements.

Abstract: A low profile camouflaged antenna for military vehicles and the like. The tenna comprises an elongated, typically rectangular, sheet of metal curved to conform to the curvature of the vehicle. Insulated spacers, for example of plastic or fiberglass, maintain a fixed spacing between the metal plate and the vehicle, thus forming two elongated slots which, when suitably energized, act as a dual-slot antenna.

Abstract: A digital filter for pulse code modulation signals employs interpolation. A digital filter can handle a multiplicity of multiplexed pulse code modulation channels.

Abstract: A thermal shunt is provided to recover the rejected heat from a radioisot thermoelectric generator utilized in a hybrid configuration with a chemical battery to maintain the chemical battery at a temperature above the environmental ambient temperature.

Abstract: A transmission photodetector operable at wavelengths greater than 0.86 micrometers comprising a substrate transparent to the radiation to be detected, at least one epitaxial intermediate layer comprising (Ga.sub.1-x Al.sub.x).sub.1-y In.sub.y As and an epitaxial p-type Ga.sub.1-y In.sub.y As detector layer. The said one intermediate layer may be p-type. If desired a second epitaxial intermediate layer comprising (Ga.sub.1-x Al.sub.x).sub.1-z In.sub.z As may be provided between the substrate and the said one intermediate layer. In the foregoing 0<x.ltoreq.1, 0<y<1, and .ltoreq.0 z< y.

Abstract: A photoconductor-switched electroluminescent matrix panel for use in a laser-addressed tactical data display system in which photoconductor elements on the back of a screen are connected in series with electroluminescent display and feedback elements which form the front of the screen and an a-c power supply. The photoconductor has a high dark impedance so that in the initial OFF position insufficient a-c power passes through the electroluminescent elements to cause significant light emission. When the photoconductor is illuminated with a light pulse from a scanning laser beam, the impedance drops sharply so that substantially all of the a-c supply voltage is received by the electroluminescent element thereby causing the element to luminesce. The photoconductivity persists long enough for the electroluminescent emission to build up and sustain the low photoconductor impedance via optical feedback.

Abstract: A lithium primary cell including lithium as the anode, a solution of an iganic salt in an inorganic solvent as the electrolyte, and a current collector as the cathode is improved in cell performance by coating the lithium anode with calcium.

Abstract: A line source antenna adapted for a light weight, compact phased array ra and consisting of a plurality of series fed radiating slots periodically located in the narrow side wall of a length of waveguide together with non-reciprocal latching ferrite phase shifters including dielectric loading sections and matching transformer sections on either side of phase shifters located between adjacent slot pairs.

Abstract: A broadband active isotropic receiving antenna for use with a conventional lectromagnetic interference receiver to measure weak near-zone electric fields of unknown polarization. The antenna consists of three mutually orthogonal active dipoles, including RF amplifier circuitry and light emitting diode means, located therein coupled to fiber optic waveguide means. The frequency range of each of the three field components is amplified and used to modulate respective light emitting diodes whose modulated infrared or visible signals are guided through the fiber optic waveguide means to photo-detectors at the far end of the fiber optic guides. These photo-detectors recover the RF modulation from the IR carrier which is then time multiplexed for input to the electromagnetic interference receiver. The DC output from the receiver is processed to provide an output voltage proportional to the square root of the sum of the squares, i.e. the Hermitian magnitude of the three mutually orthogonal electric field components.