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| Number | Title | Issue Date |
| 5216327 | Magnetron coaxial adaptor having a cap which fits over the magnetron output antenna An impedance matching coaxial adaptor for use with magnetron power sources having output coaxial probes includes an outer cylindrical housing disposed around a cylindrical inner housing. The inner housing is disposed along a common axis of the outer housi... | 06/01/1993 |
| 5208508 | Cathode heater potting assembly A potted heater assembly and a method of forming such a potted heater assembly comprises the steps of introducing into a mold having a filament disposed therein a slurry containing a liquid vehicle and particles of a refractory ceramic, said particles hav... | 05/04/1993 |
| 5192470 | Method of stretching and polarizing polymer materials A sheet of polymer material is secured between a pair of clamp members. The sheet is directed through a localized heated region to provide a localized heated portion of said sheet. A first one of said clamp members is pulled away from a second fixed clamp... | 03/09/1993 |
| 5186540 | Power measurement calorimeter A calorimetric calibration system includes a thermoelectric calibration heat pump device disposed between fluid supplying inlet and outlet pipes coupled to the waterload. The calibration heat pump device provides a controlled delta temperature to the flui... | 02/16/1993 |
| 5187447 | Combiner/divider networks A planar interdigitated microstrip coupler comprises a plurality of adjacently disposed transmission lines being spaced such that the transmission lines gradually diverge from a close spacing to a wider spacing. The planar interdigitated microstrip couple... | 02/16/1993 |
| 5179542 | Signal processor A signal processor which operates on an incoming signal to separate the signal into locally compact wavelets in the time frequency domain is described. The processor includes means for separating an incoming signal into a plurality of signals, with said s... | 01/12/1993 |
| 5175516 | Waveguide termination A liquid cooled adjustable waveguide termination for use in high power applications is described. The liquid cooled adjustable termination includes a waveguide housing having a shorting plate disposed at an end portion of the housing and an electromagneti... | 12/29/1992 |
| 5173671 | Monolithic lumped element networks An RF circuit which may be for example a high pass filter, low pass filter, phase shifter, bandpass filter, termination network, bias network, or series or parallel resonance circuit includes at least one strip conductor coiled about a region and an outer... | 12/22/1992 |
| 5148128 | RF digital phase shift modulators A BPSK (Binary-Phase-Shift-Keying) modulator having reduced amplitude and phase errors includes two non-ideal N°-bit phase shifters disposed between two 3 dB quadrature couplers to perform out-of-phase combining. When the two phase bits are alternately s... | 09/15/1992 |
| 5142253 | Spatial field power combiner having offset coaxial to planar transmission line transitions A cylindrical multi-port combiner having a graceful degradation characteristic with a high degree of isolation (25 db) between ports and a high combining efficiency (>90°) is disclosed. A radially-spaced inner and outer conductor forms a transmission lin... | 08/25/1992 |
| 5140469 | Illumination apparatus for semiconductor fabrication including conical optical means A method of patterning a photoresist layer to provide an aperture having retrograde sidewalls is described. Illumination may be through a conical prism arrangement or a conical reflecting mirror and cylindrical mirror arrangement. The method includes the ... | 08/18/1992 |
| 5140386 | High electron mobility transistor A high electron mobility transistor includes a pair of charge screen layers disposed over a first one of active and charge donor layers of the high electron mobility transistor. The pair of screen layers are patterned to provide a double recessed channel.... | 08/18/1992 |
| 5136528 | Maintenance and operational simulators Apparatus for simulating a complex system includes controller means having a sequence of instructions executed by the controller means for providing digital signals representative of a selected state and location of at least one of a plurality of indicato... | 08/04/1992 |
| 5136720 | Matrixed mixer A matrix mixer includes an amplifier having a plurality of successively coupled transistors and a mixer stage comprised of a plurality of mixer elements successively connected by a common transmission line to output of the plurality of transistors of the ... | 08/04/1992 |
| 5126694 | Phase locked oscillator A SAW stabilized oscillator includes a phase locking circuit which is phase locked to a lower frequency reference signal having an odd order difference with respect to the fundamental frequency of the SAW oscillator. A mixer is disposed in the phase locki... | 06/30/1992 |
| 5126701 | Avalanche diode limiters An RF limiter circuit having an input terminal and an output terminal includes an RF propagation network having a first end coupled to the input terminal of the circuit and a second end coupled to the output terminal of the circuit. The RF limiter circuit... | 06/30/1992 |
| 5126081 | Polycrystalline zinc sulfide and zinc selenide articles having improved optical quality Articles of polycrystalline zinc sulfide and zinc selenide achieve substantially improved optical quality by a treatment of heat and isostatic pressure by means of an inert working fluid. The treated specimens are transparent and have substantial transmis... | 06/30/1992 |
| 5120602 | Optical elements and method of manufacture An optical element includes a base layer of a first material selected from the group consisting of gallium arsenide, gallium phosphide, cadmium telluride, mercury cadmium telluride, zinc sulfide and zinc selenide, and a coating layer of the selected base ... | 06/09/1992 |
| 5119425 | Sound synthesizer A pseudo-random or transient synthesized signal is provided by analysis of a plurality of related signals by vector quantization of linear predictive coding coefficients (cluster representatives) of time blocks of the signals and providing cumulative prob... | 06/02/1992 |
| 5105166 | Symmetric bi-directional amplifier A transceiver module includes a bi-directional amplifier having a pair of symmetric signal paths for amplification of both transmit and receive signals is described. The amplifier is a bi-directional amplifier and includes a pair of symmetric signal paths... | 04/14/1992 |
| 5103130 | Sound reinforcing seal for slotted acoustic transducers A split-ring or split-cylinder transducer in which a full or partial boot covering a shell is caused to be looped into the gap of the shell so that outward radial movement and circumferential expansion of the shell causes the boot to also move outwardly t... | 04/07/1992 |
| 5091051 | Saw device method Techniques for adjusting the surface acousic wave velocity of a packaged SAW device are described. A first technique involves depositing a film from a cover of the device onto a surface wave propagating surface thereby providing a localized region on said... | 02/25/1992 |
| 5084750 | Push-pull heterojunction bipolar transistor A heterojunction bipolar, push-pull transistor includes a substrate, a first bipolar transistor region including a first collector layer, a first base layer and a first emitter layer disposed over said substrate and a second bipolar transistor region incl... | 01/28/1992 |
| 5079527 | Recombinant, in-phase, 3-way power divider A power divider circuit having an input port and three output ports is described. The circuit includes a first power divider stage having an input port which corresponds to the input of the power divider circuit and a pair of output ports with a first res... | 01/07/1992 |
| 5077875 | Reactor vessel for the growth of heterojunction devices A metalorganic chemical vapor deposition (MOCVD) reactor vessel is provided for the growth of Group II-VI, Group III-V, or Group IV layers particularly for use in thin heterostructure devices. The reactor vessel includes a chamber having a top surface sub... | 01/07/1992 |
| 5067781 | Optical elements and method of manufacture An optical element resistant to thermally induced damage and oxidation includes a base layer of a first material selected from the group consisting of gallium arsenide, gallium phosphide, cadmium telluride, mercury cadmium telluride, zinc sulfide and zinc... | 11/26/1991 |
| 5067901 | Simulated multimeter An apparatus for simulating a multimode meter having a pair of test leads, a function switch, and a range select switch is provided. The simulated multimeter apparatus is fed by digital display data signals and provides a numeric display representative of... | 11/26/1991 |
| 5063361 | Serrodyne modulator A direct digital synthesizer (DDS) includes a phase accumulator which generates phase words periodically and means for changing the phase of an RF signal. In a preferred embodiment, a DDS includes a pair of phase shifter channels having inputs and outputs... | 11/05/1991 |
| 5060030 | Pseudomorphic HEMT having strained compensation layer A pseudomorphic high electron mobility transistor includes a substrate for supporting a semiconductor active region. The semiconductor active region includes a channel layer comprised of InGaAs, which when disposed over said substrate develops an intrinsi... | 10/22/1991 |
| 5053719 | Wide-band push-pull amplifier A radio frequency amplifier includes a first pair of quadrature couplers arranged to provide in response to an input signal first and second radio frequency signals having equal amplitudes and a first single-ended amplifier is fed by said first radio freq... | 10/01/1991 |
| 5039957 | High power surface acoustic wave devices having copper and titanium doped aluminum transducers and long-term frequency stability A surface acoustic wave device having interdigitated transducers comprised of an improved metalization system including copper and titanium doped aluminum transducers. A method of producing the interdigitated transducers includes deposition of the metals ... | 08/13/1991 |
| 5036450 | Spike limiting circuit A switching circuit having an input voltage source for producing a DC voltage, a transformer having a pair of inductively coupled primary windings, a controller for electrically coupling the produced DC voltage across a first one of the pair of windings d... | 07/30/1991 |
| 5027084 | Transceiver modules for phased array antenna A transceiver module includes a bi-directional amplifier having a pair of symmetric signal paths for amplification of both transmit and receive signals is described. The amplifier is a bi-directional amplifier and includes a pair of symmetric signal paths... | 06/25/1991 |
| 5025225 | Amplifier having substantially constant D.C. to r.f. conversion efficiency A power combiner which maintains substantially constant power combining efficiency with variable output power includes a set of unit amplifiers that are coupled by the power combiner. The power combiner includes a first plurality of a quarter wavelength t... | 06/18/1991 |
| 5024872 | Sheets of stretched and polarized polymer materials and method of manufacturer A sheet of polymer material is secured between a pair of clamping members. The sheet is directed through a localized heated region to provide a localized heated portion of said sheet. A first one of said clamping members is pulled away from the second cla... | 06/18/1991 |
| 5023494 | High isolation passive switch A radio frequency switch disposed over a substrate having ground plane conductors disposed over an opposite surface thereof is described. The switch has at least two terminals, and includes a plurality of pairs of transistors, each one of said transistors... | 06/11/1991 |
| 5021743 | Biasing networks for matrix amplifiers A radio frequency matrix amplifier includes an input propagation network for successively connecting input electrodes of a first plurality of transistors. Output electrodes are successively coupled by an intermediate propagation network. The amplifier als... | 06/04/1991 |
| 5022052 | Analog signal binary transmission system using slope detection A system for transmitting an analog signal comprises converting the input analog signal to a binary signal by detecting the change in sign of the slope of the analog signal and generating a binary signal whose transition occurs at each change of sign of s... | 06/04/1991 |
| 5021756 | Transversal and recursive filters useable in a diplexer Transversal and recursive filters having an input propagation lumped element network with a band pass filter response, a low pass filter response, or a high pass filter response, and an output propagation network having a low pass frequency response, a hi... | 06/04/1991 |
| 5021300 | Solder back contact An integral solder back contact is provided over a semiconductor circuit. The solder contact includes a pair of layers which form an alloy at elevated temperatures. A semiconductor device having the integral solder back contact is mounted on the carrier a... | 06/04/1991 |
