Showing papers on "Stub (electronics) published in 1985"

Dual-band reactively loaded microstrip antenna

Abstract: A previously derived theory is applied to a microstrip antenna with a reactive load to produce a dual-band radiator. A model consisting of a rectangular patch radiator loaded with a variable length short-circuited coaxial stub was investigated experimentally. Comparisons of theoretical predictions and experimental data are made for the impedance and resonant frequencies as a function of the position of the load, the length of the stub, and the characteristic impedance of the stub.

Broad-Band RF Match to a Millimeter-Wave SIS Quasi-Particle Mixer

Abstract: An integrated superconducting microstrip is shown to be a convenient, flexible, and well-characterized matching element for a super-conductor-insulator- superconductor (S1S) quasi-particle heterodyne mixer. The resonant interaction (Fiske modes) between the Josephson oscillations of a voltage-biased junction and the microstrip provides a convenient method for determining the electrical length of the microstrip line. An open-circuited microstrip stub that reflects a parallel inductance across the junction is used to broaden the bandwidth of the RF match of a 36-40-GHz S1S- mixer. Measurements with Pb-alloy junctions in a full-height waveguide mixer with fixed mechanical tuning give an instantaneous bandwidth of '10 to 15 percent with a mixer noise temperature T /sub M/ (DSB) = 10+- 2.5 K.

Variable optical attenuator

Abstract: The variable optical attenuator (1) comprises two spherical lenses (7, 8), one at the input end and one at the output end, between which a bundle of parallel rays is present. A disk (4) having areas (9) with neutral density filters (10) of different attenuation is rotatable through the bundle of rays. A locking mechanism (13, 14, 15) acts on a stub shaft (11) at the disk (4), and its stop positions correspond to the locations of the areas (9). This permits the attenuation of the attenuator (1) to be adjusted in steps.

Water treatment plastic products for rectangular clarifiers

Abstract: A water and sewer treatment rectangular tank is provided wherein substantially all the working parts are made of non-metallic material. The system includes a telescoping non-metallic drive shaft connected to sprockets for driving chain with the sprockets being mounted to non-metallic stub posts which are mounted to the side walls of the tank.

Single mode optical fibre attenuators

Abstract: A single mode optical fibre preset attenuator is made by forming a fusion splice (2) between a length of silica fibre possessing no internal waveguiding structure to a length (1) of single mode optical fibre. Then the silica fibre is cut to a predetermined length to form a short stub (3) which is fusion spliced to a second length (4) of single mode fibre. The fusion splicing equipment may subsequently be used to heat soften the central region of the stub to enable it to be shortened or lengthened to fine tune the attenuation provided.

Modular encapsulated cross-connect terminal unit

Abstract: A terminal unit which is both modular and encapsulated is disclosed. The cable stub and cross-connect blocks are connected to the unit. The unit contains hinged panels on which the cross-connect blocks are mounted. The stub pairs are wired to the rear of the blocks. The rear of the blocks and the base wherein the cable stub enters the unit are then encapsulated. The assembled encapsulated modular unit may then be installed in a suitably arranged terminal enclosure.

Adjustable steering stop apparatus

Abstract: A steering axle stop for an axle steering joint assembly is defined by a stub shaft rigidly supported within a steering knuckle boss. In a preferred form, the stub shaft contains a plurality of apertures which extend through the shaft and perpendicularly to the longitudinal axis of the shaft. The steering knuckle boss is pivotal relative to the axle housing, and the stub shaft extends through an aperture of the boss which has its axis extending tangentially to the swing movement of the boss. The stub shaft is rigidly secured in any one of the selectable apertures by means of a clevis pin which extends through the boss perpendicularly to the latter swing movement. Also in a preferred form, the axle housing contains a projection which includes a contact surface disposed for limiting the rotation of the steering knuckle via contact of one end of the stub shaft with the latter surface. In a preferred form, the contact surface is concave and is geometrically shaped to accomodate abutting contact with one end of the stub shaft upon pivotal movement of the boss regardless of aperture selection.

Stub-supported transmission line device

Abstract: A stub-support arrangement for a coaxial transmission line wherein the line has inner and outer conductors and the stub is in the form f oppositely disposed stubs each having a length of 1/8 wavelength at the center operating frequency or less. One of the stubs is an open-circuit stub and the other is a short-circuit stub. In the case of the stubs being of 1/8 wavelength, the characteristic admittances of the stubs are equal and in the case of the stubs being less than 1/8 wavelength the characteristic admittance of the open-circuit stub becomes larger and that of the short-circuit stub becomes smaller as the physical length of the stub is reduced.

Nonradiative Dielectric Waveguide T-Junctions for Millimeter-Wave Applications (Short Paper)

Abstract: A high-performance T-junction has been fabricated based on the nonradiative dielectric waveguide. Widths of the main arm and subarm were determined experimentally. The T-junction was provided with a dielectric stub and thin-metal patches which proved to be effective matching elements in improving the performance. Well-balanced outputs in excess of -4 dB were obtained over a frequency range of 2 GHz at a center frequency of 35 GHz.

Bearing and stub shaft assembly

Abstract: A bearing and stub shaft assembly for a belt conveyor or the like provides a non-rotatable connection between the stub shaft and the inner race of a bearing supporting one end of a cylindrical roller. An inner surface of a central cup in the inner race and the deformed elliptical outer surface of a hollow end of the stub shaft interfit to give a simple, non-rotational connection. At the same time, a cylindrical coil spring captured within the end of the stub shaft as it is deformed is compressed within the central cup to provide a preload to the bearing.

Automatic controlling apparatus for a domestic water supply system

Abstract: 1. Automatic controlling apparatus for a domestic water supply system having the following features : - it has a detecting and impulse fitting (10) for determining water flow, and a shutoff valve (20) of electromagnetic type which is connected with said fitting to constitute an integral unit, also unions (13, 23) for connection to the water conduit ; - an adjustable timing relay (4) is connected electrically to the detecting and impulse fitting (10) and to the shutoff valve (20) ; - a stub pipe (101) of the detecting and impulse fitting accommodates a magnetic floating element (107) which is held by influence of forces on an inlet aperture (102) and is lifted off by the pressure of the throughflowing water, and in the lifted-off position it actuates a magnetic switch (103) arranged externally on the stub pipe (101) ; characterised by the following features : - the stub pipe (101) of the detecting and impulse fitting (10) is of rectilinear construction and is connected to the shutoff valve (20) in a rectilinear arrangement ; - there is fixedly arranged in the stub pipe (101) concentrically and with spacing from the pipe wall, adjoining the inlet aperture (102), a sleeve (104) wherein the cylindrically constructed magnetic floating element (107) is displaceably accommodated ; - a counter-magnet (106) is fixedly arranged at that end of the sleeve which is remote from the inlet aperture (102) ; - provided in the sleeve wall are throughflow apertures (105) which are at least partly unmasked by the lifted-off floating element, and the magnetic circuit (108) of the floating element actuates the magnetic switch (103).

Impedance Transformation and Matching for Lumped Complex Load with Nonuniform Transmission Line

Abstract: New nonuniform transmission-linematching networks for a class of lumped complex loads are presented. A parabolic (or reciprocal parabolic) tapered transmission line, whose exact equivalent circuit is represented by a mixed lumped and distributed circuit, can transform the lumped series RC (or parallel RL) loads into different lumped impedances which are more convenient than the original load impedances for ordinary matching network design. Simple design procedures are described and useful design charts are given. Also, numerical examples are shown including experimental verification.

Method for providing a tubular node in a frame work truss structure such as offshore platforms for oil drilling and production

Abstract: A method for providing a tubular node in frame work struss structures, such as offshore platforms for oil drilling and production activities of the type consisting of interconnected legs and braces of steel tube elements. For formation of the transition between leg and brace in the node is in accordance with the invention utilized a blank of rolled plate steel, which is given the desired curved shape corresponding to the curvature of the leg. The blank is by means of pressing or extrusion in a suitable press tool formed with an outwardly extending brace stub at the desired angle, which brace stub is designed for welding to a complementary brace tubing in the frame work. Thereafter the blank with the brace stub is welded into the leg proper and will constitute a wall segment of the leg in the node.

Bearing support for microwave oven antenna

Abstract: A microwave oven having a low friction bearing support for a rotatable microwave feed assembly which includes a primary radiating antenna axially coupled to a cylindrical metal stub that vertically extends from the microwave cavity through an aperture into the waveguide where it is excited by microwave energy. The stub has a bottom cylindrical bore which inserts over a microwave transparent post that extends upwardly through the aperture from a horizontal cross bar suspended by two legs connected to the cavity ceiling. The cross bar may be oblique to the waveguide to centrally and positively align the post in the aperture. The roof of the bore has a downward spherical surface which provides a low friction bearing with the microwave post. The feed assembly also includes a microwave transparent turbine against which a stream of air is directed to rotate the feed assembly.

Miniature Millimeter-Wave Integrated Circuit Wideband Downconverters

Abstract: The miniature millimeter-wave integrated circuit LO/mixer assembly was developed with over the full waveguide band coverage and good temperature stability. A conversion loss of less than 7 dB was achieved over 16 GHz instantaneous IF frequency with the RF swept from 30 to 46 GHz and the LO at 48 GHz. With another mixer, when the RF was swept from 18 to 30 GHz and the LO was at 32 GHz, similar results were achieved. Using resonant stub and dielectric temperature compensation produced good temperature stability.

Impedance adjusting element for a microstrip circuit

Abstract: Impedance adjusting elements for a microstrip circuit of the kind employing a signal transmission line connected to an active circuit element and impedance matching elements, such as parallel-connected open-ended stubs, are formed of one or more wire elements arranged in proximity to the transmission line and the open-ended stub and connected at one end to the ground plane on the side of the substrate opposite the transmission line, wherein the free end of the wire elements can be freely moved, thereby adjusting the spacing of the wire elements from the respective signal path and open-ended stub and adjusting the angle of intersection of the wire elements and the respective signal path and open-ended stub, so that the effective impedances of the circuit can be controlled.

Dual Function Mixer Circuit for Millimeter Wave Transceiver Applications

Abstract: A monolithic mixer circuit capable of performing either a receiver or transmitter function has been fabricated. The mode of operation is determined by applying either forward bias or reverse bias to a pair of mixer diodes. The circuit integrates Schottky-barrier diodes, bias lines, Ta/sub 2/O/sub 5/ blocking and by-pass capacitors, a radial line stub filter and a microstrip branch-line coupler. For the receiver function the unit exhibits a conversion loss of 6.5 +- 0.5 dB from 34 to 36 GHz. For the transmitter function the circuit directs the signal from the local oscillator port to the antenna port with an insertion loss of approximately 2 dB at 33.5 GHz over a bandwidth of 1 GHz.

Dipole array with phase and amplitude control

Abstract: A bistatic VHF Doppler radar is utilized to detect and track one or more intruders crossing a large annular ring surveilance zone surrounding a central high security installation A central omni-directional transmitter radiates the surveillance zone with a continuous wave (CW) signal Predetermined ones of a plurality of receiver antennas circumferentially spaced around the surveillance zone receive a portion of the signal which is reflected by an intruder crossing the surveillance zone and a portion of the signal which is directly radiated from the transmitter antenna The reflected signal portion may be received by antenna arrays each of which is controlled to form a null in its pattern toward the transmitter antenna to overcome direct signal overload The direct signal portion may be received by stub antennas Each antenna array and each stub antenna is connected to a separate channel of a dual channel receiver An intruder moving across the surveillance zone causes signals representative of Doppler cycles of phase change to be generated The outputs of the two separate channels are compared and their relative phase changes measured A detected intruder causes an alarm signal at a central processing station and the Doppler information is processed to generate tracking data which is shown on a display device An automatic null control circuit may also be utilized to accommodate multipath conditions and static clutter due to environmental factors

Plug-in cable fitting

Abstract: In the case of a cable fitting which is constructed as a straight plug for the plug-in connection of a screened heavy-current cable to an electrical apparatus, in order to provide conductive electrical access to the conductor of the heavy-current cable, the insulating body (1) of the cable fitting is provided with a second connecting stub (10) which, in the region of the screening electrode (5) of the insulating body is arranged at right angles to the straight-line continuous hole (2) in the insulating body. This connecting stub (10) is of the same design as the opening (4) of the continuous hole (2) on the apparatus side.

Turbine rotor for gas turbine engine

Abstract: A rotor for a gas turbine engine includes a turbine wheel with a centerbore therethrough, a main shaft projecting through the centerbore, a turbular stub shaft surrounding the main shaft at a turbine end of the latter and being rigidly connected thereto so that the stub shaft defines a radially spaced reverse flange on the main shaft, a tubular reference shaft around the main shaft having an output end rigidly connected to an output end of the main shaft and a turbine end rotatably journaled on an inside surface of the stub shaft, a plurality of axial slots in the stub shaft, a plurality of pole supports projecting radially from the reference shaft turbine end through the stub shaft slots, a plurality of first pole pieces on the pole supports, a plurality of second pole pieces on the stub shaft between the first pole pieces, and a stationary pick-up operative to develop an electrical signal proportional to the spacing between the pole pieces while the rotor rotates which spacing is proportional to rotor torque.

Swivelling pipe discharge for fittings

Abstract: In the case of a swivelling discharge for fittings, a pipe end (12) engages into a discharge stub (11). The pipe end (12) has, on its outer side, a peripheral groove (16) in which a securing element (17) is inserted. By means of an attachment (18), the securing element (17) can be fixed axially on the discharge stub (11), in an opening (19) of said discharge stub (11). It is likewise possible for the securing element (17) to engage in a groove on the inner side of the discharge stub (11). The securing element (17) can be deformed to such an extent that it is located entirely inside the groove (16) of the pipe end (12).

Feeds for transmission lines

Abstract: It is often desired to transfer microwave energy into a coaxial cable transmission line in circularly symmetric (Transverse Electromagnetic) mode One case is in low power radar systems, wherein rotating joints are employed in the transfer of microwave electromagnetic radiation energy between two sections of apparatus one of which rotates relative to the other The well-known "stub-supported" fashion is one way of feeding the joint, but it is not problem-free, and necessitates a significant length of conductor between the two stubs, which means that such joints are considerably longer than is desirable The invention provides a novel way of supplying the energy to each joint conductor, where there is employed a conductive feed ring (or short tube) positioned around and spaced from the conductor, and this ring is itself fed by a stub and is shorted to the relevant outer joint conductor at a point diametrically opposite the stub

Multiplexers and methods of measuring conditions in harsh environments

Abstract: @ A passive multiplexer for processing a plurality of conditions in a harsh environment comprises a transmission line (12) having a measurable impedance characteristic. A plurality of crystals (31 - 33) are coupled to the transmission line (12), each crystal having a different resonant frequency. Each crystal (31-33) has a first impedance when excited by its resonant frequency and a second impedance when not excited by its resonant frequency. A switch or other transducer (34-36) is connected to each crystal (31-33) or between each crystal and the transmission line (12) for selectively connecting or disconnecting the crystal, or otherwise influencing the impedance of the crystal in response to each condition of interest in the harsh environment (10). A frequency sweep generator (56) is connected to the transmission line (12) for supplying the line with a range of frequencies within which all of the resonant frequencies lie, so that each of the crystals (31-33) can be excited. A detector (58) is connected to the transmission line (12) for detecting changes in its impedance which results from impedance influence of the crystal (31-33) on the line depending on whether the transducer (34-36)has connected or otherwise effected the crystal and whether the crystal is being excited by its resonant frequency.

Twisting-moment measuring method in twist applying test

Abstract: PURPOSE:To simplify measurement and to prevent errors, by fixing the tips of wires to the circular outer surface of a force applying stub, which is linked to a test specimen, winding wires by less than 180 deg., and measuring the tensile force of the wires by an actuator. CONSTITUTION:A pair of positively and negatively twisting, hydraulic jacks 6 and 7 is fixed to gate type frames 5 and 5 on a floor 4 in a diagonal relation. A test specimen 8 is fixed on a base 9 on the floor 4 between the frames 5 and 5. A vertical-force applying, hydraulic jack 11 is mounted on a beam member 10 that is provided on the frames 5 and 5. A pair of U shaped fixing pieces 13 is fixed to the outer surface of a force applying stub 12, which is linked to the test specimen 8. The tips of PC steel stranded wires 14, which are liked to the jack 6 or 7, are fixed to the fixing pieces 13. The wires 14 are wound around the outer surface of the stub 12 by less than angle of 180 deg. and pulled by the jack 6 or 7. In this way, the tensile force is measured, and the twisting moment can be found.

Abrasive polishing/finishing machine

Abstract: A machine is adapted to carry outpolishing/finishing action, using a magnetic abrasive medium, on a shafted gear (5) of the type used in hydraulic gear pumps and having a pair of stub shafts projecting one on either side of a gear wheel. The machine comprises a rotatable work table (1) having on its periphery clamping devices (2) each comprising a bracket fixed to the table (1) and supporting upper and lower holders which engage with the ends of the stub shafts to hold the shafted gear (5) in position to be worked on. A plurality of working stations (4, 6, 7, 8) are spaced around the periphery of the work table (1) and the work table (1) is rotatable incrementally to advance the clamping devices (2) from one station to another to enable the series of working actions to be carried out. A driving device anociated with each clamping device (2) includes a drive gear driven by a motor and resiliantly engaged with the shafted gear (5) when the latter is undergoing treatment at one of the working stations. At least one of the working stations (4) is arranged to carry out polishing action on the stub shafts of the shafted gear (5) and comprises pairs of blades which embrace respective stub shafts therebetween, means for magnetising the blades and means for feeding magnetic abrasive medium into the spaces between the blades and the stub shafts.

Optical fibre reflectometer

Abstract: An optical fibre reflectometer in which the end of the optical fibre 4-port coupler for optical coupling to test fibres is not protected from damage by the use of a sapphire window because of the problems of unwanted reflections that this engenders. Instead the end is coupled to the test fibres by means of a replaceable slug (33) containing a stub length of fibre (20). This fibre stub (20) is intrinsically just as susceptible to cumulative damage when test fibres are repeatedly butted against its end, but it protects the coupler because it is itself butted against the coupler only once in its life. When the cumulative damage becomes excessive the slug can be replaced more simply and cheaply than replacing the whole coupler.

Hollow shaft with a permanently connected flange

Abstract: In the case of a hollow shaft (1) with a permanently connected flange (2) composed of a material with a higher shear modulus than the material of the hollow shaft, the flange has a tubular stub (3) which is pushed into the hollow shaft (1) with the interposition of a layer (4) of adhesive. To relieve the load on the end region - critical in terms of strength - of this layer (4) of adhesive at the end of the tubular stub, one half of a bush (6) is seated in the tubular stub (3) and the other half is seated in the hollow shaft (1), with the interposition of a layer (5) of adhesive, the material chosen for the bush (6) having a shear modulus which is less than that of the material of the tubular stub (3) or permanently connected flange (2) and greater than that of the material of the hollow shaft (1).