Showing papers on "Stub (electronics) published in 1981"

RF Applicator for in situ heating

Abstract: A coaxially fed applicator for in situ RF heating of subsurface bodies with a coaxial choke structure for reducing outer conductor RF currents adjacent the radiator. The outer conductor of the coaxial transmission line supplying RF energy to the radiator terminates in a coaxial structure comprising a section of coaxial line extending toward the RF radiator from the termination for a distance approaching a quarter wavelength at the RF frequency and a coaxial stub extending back along the coaxial line outer conductor from the termination for a distance less than a quarter wavelength at said frequency. The central conductor of the coaxial transmission line is connected to an enlarged coaxial structure approximately a quarter of a wavelength long in a region beyond the end of the outer conductor coaxial choking structure.

Patch antenna having tuning means for improved performance

Abstract: A patch antenna employing a matching stub for improved performance. The patch antenna comprises a conductive patch disposed closely over a ground plane, having a shorting pin shorting the conductive patch to the ground plane at a central point and a coaxial feed line attached to the conductive patch at a point between the shorting pin and the edge of the patch for conducting electromagnetic energy to or from the conductive patch. The matching stub comprises a conductive member extending at least partially between the ground plane and the conductive patch at a point located on the opposite side of the shorting pin from the feed line. Performance is further improved by leaving only a small portion of the inner conductor of the coaxial feed line uncovered by the outer conductor.

FET Microwave oscillator being frequency stabilized by capacitive reactance micro-strip stub line

Abstract: A microwave oscillator circuit with an FET, a dielectric resonator and a micro-strip line has a capacitive reactance element connected between the source terminal of the FET and ground or between the source and drain terminals of the FET, so that the oscillation frequency fluctuations due to the power supply voltage fluctuations or the ambient temperature variations can be suppressed.

Planar N-way combiner/divider for microwave circuits

Abstract: A microwave combiner/divider circuit instrumented in stripline medium and therefore planar in form. Circuit traces are produced by etching of a standard microwave printed circuit board having a conductive ground plane or base plate and a layer of low-loss insulation over which a copper layer is provided. A common signal port feeds a division point through a capacitive stub and a two-stage, ring-type impedance matching circuit. The multiple circuit traces emanating from the division point are arranged so that N individual branch ports are connected thereto. The stripline circuitry between the division point and the branch ports provide compensation for phase reversal. Resistors for branch port isolation connected within the stripline circuitry such that for equal loads or equal power sources connected to the branch ports (divider or combiner applications, respectively) zero currents flow in these resistors and they are therefore not required to provide a large power dissipating capability.

Surface acoustic wave convolver having a horn central ray transit time compensating stub

Abstract: A surface acoustic wave convolver (10) with parabolic horns (16, 18), a typical horn (16) having a compensating stub (16a) at the horn input end (16b) disposed centrally on the horn longitudinal axis (19) to maintain the phase coherence at the horn output end Z(16c) of a wave traversing said horn (16).

Printed dipole antenna

Abstract: PURPOSE: To attain the impedance matching at the operating frequency band through the connection of a simple stub by connecting the stub made of a microstrip line where a metallic foil forming a dipole is used as the grounding conductor to a feeder joint of the dipole. CONSTITUTION: Stubs 5, 6 are connected to a reference face A-A' near the joint between dipoles 2a, 2b and parallel 2-wires 3a, 3b in parallel. Since the admittance frequency characteristic before the stubs 5, 6 are connected is not subjected to the long feeder effect, the characteristic is smaller than the frequency characteristic at a reference face B-B' and the matching with a desired voltage standing wave ratio or below is taken by connecting the stubs 5, 6. The stubs 5, 6 are formed by a microstrip line and its ground conductor is the dipoles 2b, 2a. That is, since the structure that the two stubs are connected at the reference face A-A' is adopted, the range of the impedance with a good matching is wide in comparison with one stub. COPYRIGHT: (C)1987,JPO&Japio

Permanent magnet rotor for electrical machines - esp. bicycle dynamo, using ferrite magnet which is either sintered or bonded with polymer, and is joined to stub axle

Abstract: A multiple ring magnet which can be magnetised laterally is made with a counterbore at one or both ends. A hub is fixed in the counterbore and is used to hold a stub axle. The hub(s) and the stub axle(s) are pref. made of a metal; and an adhesive is pref. used to hold the hub(s) in the counterbore(s). The hubs are pref. joined to the stub axles by welding. The rotor is pref. made by mixing a ceramic magnet powder with a polymer and then using injection or pressure moulding to make a magnet from the mixt. During moulding, a magnetic field is used to make an anisotropic magnet. Alternatively, the ceramic magnet powder may be mixed with a binder and moulded into a ring which is then sintered. The rotor is lighter and stronger than similar conventional rotors but has comparable magnetic properties.

Non-contacting RF shielding gasket with molded stub members

Abstract: An RF shielding gasket is provided for establishing low impedance paths, in a given frequency range, in the interface area between two conductive surfaces. The gasket includes a first and second plurality of stubs. The stubs are joined to one another by a conductive member. The stubs are open circuited at one end and connected to the conductive member on the other end. Each stub is folded back upon itself between the two ends. In the interface area, portions of each of the conductive surfaces function as ground planes and a first and second plurality of microstrip lines are thus provided. The open circuits are transformed into low impedance paths, in the frequency range of interest, between the second end of the stubs and the portions of the first and second conductive surfaces. In one embodiment, the stubs and conductive member are formed into a substantial U-shape with a resilient core in the central volume to form a compact RF gasket.

Multi-purpose chemical industrial apparatus

Abstract: The multi-purpose chemical industrial apparatus according to the invention, particularly for carrying out different processes of pharmaceutical technologies, -which has preferably a double-walled basic apparatus assembled from cup and connected aponable dome cover, the basic apparatus having a part for admission of the material to be processed, e. g. one or several intake stub(s) arranged on the dome cover, a part for removal of the material, e.g. discharge stub arranged on the cup, and devices suitable for a given case for temperature variation of the material- formed in such a way that the basic apparatus is connected with at least one washing unit and filter unit, as well as a combined attachment unit connectible to the discharge stub of the cup of the basic apparatus. Further criterion of the multi-purpose chemical industrial apparatus according to the invention is that the cup of the basic apparatus has a heater stub connectible to heat source, e.g. heat exchanger, and the heater stub is led into the jacket space between the double wall of the cup.

Track-bound electric motor vehicle

Abstract: Disclosed is a driving arrangement for an electric motor vehicle in which each of the two wheels of an axle is supported on separate shaft sections. Each motor or each rotor of a dual rotor motor drives only one driving wheel of an axle in order to mechanically decouple the driving wheels. One of the separate shaft sections of the axles includes a tapered portion which forms a shaft stub and the other shaft section includes a hollow shaft stub. The tapered shaft stub is supported in the hollow shaft stub by a slide bearing disposed inside the hollow shaft stub. Speed differences at the slide bearing between the axle sections can result only from slippage when negotiating a turn or from uneven wear of, for example, the wheels.

Wideband 180 DEG hybrid junctions

Abstract: Coaxial, impedance-matched, four-port 180 DEG hybrid junctions for multioctave bandwidth operation include a gap in the outer shields of a port and a stub line at their interface for forming a uniform electric field within the gap. This gap and the interconnections between inner conductors and shields of certain ports and the stub, and the lengths of the port and stub lines are such that power input to a first port divides equally and in phase between two other ports with matched impedances and no power is at present at the fourth port. Similarly power fed into the fourth port divides equally, but 180 DEG out of phase, between the two other ports with matched impedances and no power is present at the first port.

Shear Strength of Slabs in Stub Girders

Abstract: The results of a test of a stub girder which failed by longitudinal shear in the slab are presented. The measured force in the slab at failure is compared to the theoretical longitudinal shear transfer strength. A procedure is outlined for the investigation of shear strength in slabs of stub girders. A numerical example is given to illustrate the procedure.

Broadband non-contacting RF shielding gasket

Abstract: An RF gasket for reducing the flow of energy in the interface area between two conductive surfaces includes a plurality of stub pairs. These stub-pairs are dimensioned to form sub-groups of low impedance paths between the two conductive surfaces with each sub-group being effective in a different frequency sub-band of a large frequency range. The low impedance paths are established without the use of direct current connections between the two conductive surfaces. Such a gasket provides a broadband, non-contacting RF shield in the interface area between the two conductive surfaces.

Drive bearing for square end shaft of lift out winding cylinder - has axially fixed and axially slidable halves forming square recess

Abstract: The arrangement is intended for carrying and locking in position the square-section stub end of the shaft of a winding cylinder for paper, textile, plastics foil, metal strip or the like. This enables it to be driven by a drive shaft (2). The shaft (2) end (7) has an open V-shaped recess capable of receiving the square stub end and a bush (3) with a V-shaped recess open in the opposite direction which is axially slidable so that the two recesses form a square-section opening in which the stub end fits. The bush is moved by a pivoted lever (6) to which it is coupled via a radial pin (4) in the bush carrying a roller (5) in a recess (6a) in the lever.

Strip line filter

Abstract: PURPOSE:To increase the attenuation of a stopping band without increasing the degree of attenuation of a pass band, by attaching a capacitive or inductive stub at the opposite side of the area of a transmission line where a resonator approximates. CONSTITUTION:The area of a terminal-opened line from its end to a length equivalent to the 1/4 wavelength of a resonator 1 forming a filter is set close and in parallel to a transmission line 2. The terminal-opened transmission line has a length equivalent to 1/2 wavelength of the resonator 1. Then a capacitive or inductive stub 8 is attached at the place to oppose to either one of both the ends at the area equivalent to a length of 1/4 wavelength of the line 2 as well as at the opposite place.

A continuous form assembly of mailer sets

Abstract: A continuous form mailer set assembly is provided in which the interior plies (36) of each mailer set are extended into both line hole stubs (54). The interior plies associated with each mailer set are completely separate one from another and there is no continuous stub on either side of the interior plies. Thus, only the two outside plies are glued together where the form is folded and this eliminates the tenting problem. Both sides of all of the interior plies have slots (34) punched through them and the glue lines are put down so that when the form is assembled the glue bleeds through the corresponding holes of the interior plies to maintain their registration.

Fishing bobber with line release

Abstract: A bobber having an automatic line release feature wherein line to be released is stored on a spool formed by an annular flange on one side and a bobber on the other side. A pin extends through the bobber with a hook-shaped end which retains the fishing line in place. An opposite end of the pin is terminated in a cylindrical stub which is free to move up and down within a well. Fishing line is connected to the stub so that upward tension occurs during casting, forcing the pin and in particular the hook-shaped portion retaining the line upwardly, closing the spool. When line tension is released, the cylindrical stub falls and so does the hook which retains the line. The line is now free to slide off of the spool.

Tension-band held pipe stub for flue pipe side openings - has one end flanged and shaped to flue pipe contour and carries two-piece tension band

Abstract: The tension-band held chimney flue pipe-stub is for fitting to lateral openings in flue pipes. The stub and seating against the flue pipe is flanged to produce a continuous sealing surface between the two and they are held together stressably and releasably by a flexible two-piece tension band fixed to the stub. This is of constant dia., less than or equal to that of the flue pipe, the flanged portion only being shaped to match the latter's contours. Pipe-stub bore is pref. between 100 and 300 mm; wall thickness 0.3 - 3.00 mm.

The ultrasonic stress distribution in the fatigue dumb-bell specimen

Abstract: With ultrasonic fatigue-cycling, a dumb-bell design of specimen is commonly used, some being of a shape for which the well-known stress equations pertaining to a stub dumb-bell would only give a poor approximation to the actual stress endured. In cases where the gauge-fillets are too large to be ignored theoretically, the stress distribution is examined in detail and expressions are found for the maximum stress amplitude S and resonant half-length l. Special requirements for S and l leading to optimum specimen design are also found.

Knob for car window winding handle - is moulded of plastics around perforated curved conical portion of bearing bush, rotatable on stub end of handle

Abstract: The rotary knob (38) is intended for fitting at the end of a crank handle (44) for the window winding mechanism in a car. It consists of soft plastics and is rotatable and axially located on a hollow stub end (40) integral with the crank handle. The knob is injection-moulded around a bearing bush (31) in a harder material, which is rotatable on a, preferably plastics, stub end. The bush comprises a central tubular portion surrounded by a portion (32) which extends in radially outward direction and has a curved conical contour. This portion is provided with cut-outs to anchor the knob moulded around it.

Compact stub mounting for windscreen wiper - has drive lever alongside wiper arm lever with offset bearing

Abstract: The compact mounting for a windscreen wiper stub has the drive arm (13) and the wiper connection (17) fitted close to each other on the same side as the stub bearing. A water deflector is included while the stub base is secured by a short mounting. The wiper drive can be fitted into a shallow recess and is fitted from one side only. No access is required behind the mounting bulkhead.

Furniture and appliance castor - with elastomer sleeve for stub shaft swivel

Abstract: A castor for furniture and domestic appliances consists of a carrier housing, made of plastics or a light metal pressure die casting, for two plastic roller wheels with a rubber tyre. The castor is attached to the furniture by a threaded stub shaft which runs on a ball inside a metal bush. The metal bush is located in an elastic sleeve, made of rigid polyurethane, in a recess of the carrier housing. This combines a cushioning of shocks with an effortless directional running stability.

Grease gun for windscreen wiper stub - has screw fitting over stub and screw operated plunger

Abstract: The grease gun for windscreen wiper stubs has a screw fitting over the stub, after the wiper arm and rubber seal have been removed. The grease is forced into the stub bearing by screwing down a plunger (1) in the top of the gun. The greasing prolongs the life of the wiper linkage. The gun is screwed onto the stub after loosening the packing to allow grease to flow into the bearing. Graphite grease packs the bearing and protects it. The gun is simple and effective and requires little skill to use. The wiper linkage does not have to be removed.

Semiautomatic rotary razor

Abstract: A semiautomatic rotary razor comprises a rectangular box-like frame (1), an annular cap (4) mounted on the front face 2) of the frame and having a reticulate outer blade (5), a rotary shaft (6) extending across the frame with one end protruding out of the front face of the frame, an inner blade assembly (7) mounted on the protruding end of the rotary shaft inside the blade (5), a fly wheel (8) and a pinion (9) mounted on the rotary shaft within the frame, a partition wall (10) extending within the frame along the length thereof, a stub shaft (12) displacably mounted in the frame adjacent to and parallel to the rotary shaft (6), and a slidable rack bar (17) having rack teeth (18) thereon for driving a pinion (13) on the stub shaft to rotate the stub shaft and displace the stub shaft so that a transmission pinion (14) on the stub shaft engages and drives the pinion (9) and thus the rotating shaft together with the flywheel and the blade assembly to provide a shaving action.

A compound with trimmable electric impedance i.e.a stub

Abstract: A uniform electric component realizing a resistive-capacitive impedance, or a stub, comprising such a parallel connection of shorted and open structures of various lengths and widths of distributed RC-structures, where different structures are manifested as a steplike or smoothened shape of the line opposite the driving point of the component The structures are also manifested as a mutual electric connection or disconnection between the resistor layer (13) and the ground plane (221) at various points of the said line The measures of the stub are defined in a successive iteration process between the employed frequencies (f1, f2) and the required admittances (Y1, Y2) The stub is trimmed by shortening it or by removing or disconnecting one or more layers so that the endline of the remaining structure becomes perpendicular to the conduction band (211) The stub can also be manufactured as a reversibly trimmable structure The stub can be used as part of a bandrejection filter

Slotline-Microstrip Transition on Iso/Anisotropic Substrate : Broadband Design

Abstract: The two-stub transition design is analysed on isotropic and anisotropic substrates Broadband design is made by optimizing the slotline and the stub lengths Sensibility analysis of the behaviour of the whole structure with these parameters shows the slotline length and impedance to be the dominant factors An extended-octave design can easily be achieved, with VWSR less than 15, for double-transitions

Furniture door hinge mechanism - has outer eccentric lever end engaging spaced stub axles forming hinge axis

Abstract: A movable piece on a door and a fixed piece on a furniture unit are linked by an inner and an outer guide lever, in an eccentric hinge mechanism. The hinge axis (13) of the outer lever (a) on the movable piece (3) comprises two stub axles (27,28) rotatably mounted, in the side (18) of this piece's hinge cup (16) let into the door (7) at opposite points in bearing holes (35,36). The axles are axially spaced, with their open inner end faces (30) engaged by the end part of the outer lever. The side edges of this are non-rotatably and eccentrically connected to the stub inner end faces.