Showing papers on "Stub (electronics) published in 1969"

Directional nonreturn to zero computer bussing system

Abstract: A high-speed data transmission network employing data representations as changes in voltage along a transmission line. Directional coupling elements are spaced along the transmission line to couple information from the transmission line to stub lines. Each stub line is connected to a receiver circuit designed to interpret pulses on the stub line as one binary state and no pulses on the stub line as a second binary state.

Trailers with power transfer system

Abstract: A cargo trailer to be coupled in train to others and to be drawn by a drive vehicle provided with a single power source for the trailers. The trailer includes a chassis with rigidly running wheels and a rectangular platform with cargo conveyor rollers journaled between the platform sides. The several rollers have interconnected drive means so that driving torque applied to one roller will impart conjoint rotation to all. The trailer has a flexible shaft extending over its length, which drives stub shafts journaled in a gear box. Each stud shaft has a shaft which can engage a roller. A king pin pivotally joining the chassis and platform, permitting rotation of the latter to provide a cargo turntable.

Resonant cavity microwave applicator

Abstract: A resonant cavity, defined by a cylindrical sidewall and first and second transverse end plate members, is excited in the TM010 mode by a source of microwave energy to generate an electric field with lines extending generally parallel to the axis of the sidewall of the cavity. The intensity of the electric field increases in a radial direction of the cavity from a minimum at the sidewall to a maximum along the axis. A thin, continuous slot is provided in the sidewall and end plates so that a filament can be inserted into the cavity in an axial disposition and then moved lengthwise along the axis of the cavity for drying. Air is preferably circulated through the cavity for carrying away moisture and for cooling the sidewalls of the cavity. An adjustable stub, mounted for radial movement in the cavity, tunes the resonant frequency of the cavity to match the frequency of the source. A coupling probe is located on one of the end plates; and the tuning stub is adjusted to maximize power coupled to the probe for tuning.

Significance and application of stub column test results, June 1969 (71-18)

Abstract: l. INTRODUCTION 1 2. BASIC CONCEPTS 3 3. EFFECTIVE TANGENT MODULUS VS. EFFECTIVE MOMENT OF INERTIA RELATIONSHIPS 9 4. APPLICATION OF STUB COLUMN TEST RESULTS 17 5. SUMMARY AND CONCLUSIONS 20 6. ACKNOWLEDGEMENTS 23 7. NOMENCLATURE AND DEFINITIONS 24 8. APPENDIX 26 9. FIGURES 30 10. REFERENCES 46

Permanent waveguide connection for occasional use

Abstract: A coaxial coupling for connecting a test or other incidental signal with a waveguide by means of a probe within the guide is provided with a cavity forming cap so that when the connection is not in use and the cap is in place, the cap together with the probe forms a quarter wavelength shorted stub which renders the probe electrically invisible within the waveguide.

Tuning arrangement for a strip transmission line in a hermetically sealed package

Abstract: A tuning arrangement for a hermetically sealed strip transmission line is provided. A portion of the ground plane of the strip transmission line is removed leaving a portion of the dielectric substrate exposed. An enclosure surrounds the entire transmission line except for the area thereof where the ground plane is removed and the dielectric is exposed. A tuning stub is supported with respect to the removed area of the ground plane so as to enable tuning of the transmission line by the stub. Since the dielectric substrate remains between the inner area of the enclosure and the outside atmosphere, a seal can be maintained between the inner area of the enclosure and the outside atmosphere.

Bandstop filter for the H10 mode in a rectangular waveguide

Abstract: A bandstop filter for the H10 mode in a rectangular waveguide is established by a stub in the E-plane. The enlargement of the bandwdth of this filter by a stepped pattern of the stub or by cascading of stub filters is outlined.

Directional filter comprising a resonant loop coupled to a transmission line pair

Abstract: A DIRECTIONAL FILTER INCLUDES A RESONANT LOOP BETWEEN A PAIR OF NARROW MICROSTRIP TRANSMISSION LINES. AN OPEN CIRCUIT STUB AT THE END OF ONE OF THE LINES EXTENDS A PARTICULAR DISTANCE BEYOND THE IMMEDIATE COUPLING REGION BETWEEN THAT LINE AND THE RESONANT LOOP.

High performance dynamoelectric machine with permanent magnet stator

Abstract: High-performance dynamoelectric machine capable of rapid response to fast changing operational requirements and conditions incorporates stator having magnetic poles and shell. Each pole comprises two axially extending separated pole pieces connected to shell by two or more axially extending permanent magnets. Pole pieces are separated transversely by a space in which a conductor is disposed. Conductors are connected to form a short-circuited winding. Low inertia rotor includes a magnetic core having stub shafts secured to ends thereof and a commutator on one stub shaft. Conductors in circuit with commutator extend axial length of rotor core and are embedded in insulating material compatible with other insulation used, to maintain the conductors in place but permit effective dissipation of heat from the rotor assembly. Baffles may be used to force cooling fluid over and around the movable member to provide increased heat dissipation.

Improvements in or relating to hydraulic shock absorbers

Abstract: 1,145,942 Making stub axles, stamping ARMSTRONG PATENTS CO Ltd 9 Sept, 1967, No 41281/67 Headings B3A and B3Q A method of sizing and attaching an hydraulic shock absorber cylinder to a stub axle housing 2 comprises reducing the diameter of a length of the cylinder to correspond to the diameter of a bore 10 in the stub axle housing, further reducing the diameter of a portion of said length adjacent an end of the cylinder, attaching a cap member 6 to the further reduced portion and attaching the first reduced portion within the bore 10 The diameter of the cylinder is variable within commercial limits and is reduced to the accurate dimensions required in a swaging die 3, which includes a stop 7 The cap 6 is welded in place in the end of the cylinder, which is brazed to the axle housing 2

Means for producing relative movement between two bodies

Abstract: Means for moving one body relative to another comprises a main toothed rack carried on one body and at least three actuators carried on the other body. Each actuator carries a stub rack of similar form to the main rack and is operable to force the stub rack into engagement with the main rack. The spacing between the actuators is such that sequential operation of the actuators causes the bodies to move relative to one another in the required direction.

Frequency selective attenuation apparatus

Abstract: The specification discloses a frequency selective or gain equalizing attenuator having a highly controllable profile of attenuation versus frequency of microwave energy propagated along a transmission line. Spaced a quarter-wavelength apart, a pair of resonant stubs are coupled to the line through resistive loss elements. Depending upon the frequency of the incident energy and the length of the stubs, the coupling of the lossy elements to the line varies as the stub reactance varies from short to open and, accordingly, provides a predetermined desired attenuation characteristic. The overall discontinuities on the transmission line caused by the stubs and lossy elements substantially mutually cancel each other because of their symmetry and quarter-wave spacing along the transmission line. A full reading of the specification is recommended for details of the concepts involved.

High power,high efficiency silicon avalanche diode uhf and l band oscillator

Abstract: A IMPROVED SILICON AVALANCHE DIODE OSCILLATOR FOR PULSED OPERATION IN THE UHF OR L BAND, WHICH HAS AN EFFCIENCY (40 PERCENT OR BETTER) AT LEAST EQUAL TO THAT OF VACUUM TUBE OSCILLATORS OPERATING AT THESE FREQUENCIES, IS OBTAINED BY UTILIZING AT LEAST THREE SPACED SLIDING SHORT STUB TUNERS AS PART OF A COAXIAL STRUCTURE IN WHICH IS SITUATED THE DIODE.

Improved Door Handle Assembly

Abstract: 1,159,161. Furniture &c. handles. B. WANSBROUGH and R. M. TURNBULL. 23 Sept., 1966, No. 42593/66. Heading A4U. [Also in Division E2] In a door handle assembly, which is mounted without visible screws, the escutcheon plate consists of a base plate 4, secured to the door by screws 19, and a cover plate 5 having an externally threaded hollow boss which is in threaded engagement with an internally threaded aperture in the base plate. The boss forms a bearing for a stub shaft having a squared end 9 operatively engaged in a lock 18, and an end 10 embedded in epoxy resin in a cavity 15 as a knob 6. Bearing washers 2, 3, coverplate 5, and knob 6 are secured to the shaft by the setting of the resin, and this assembly is mounted on the door, on which the base plate is already screwed, by insertion of the shaft through co-incident apertures in the base plate and in the door and rotating the cover plate in threaded engagement in the aperture in the base plate. The base plate has projections 8 for preliminary marking of the door at the positions where apertures should be drilled for the screws 19.

High speed logical gates

Abstract: A NOR gate comprising a first module including a plurality of NPN inverter transistors having a common emitter resistor and a common collector resistor and bases respectively connected to input data terminals, a line stub of a given characteristic resistance having its input connected across said common emitter or collector resistor and a second module including a NPN emitter follower separator transistor having an emitter connected to the output data terminal of the gate, a base bias resistor connected across the output of said line stub, an emitter resistor and eventually a collector resistor, said common emitter or collector resistor and base bias resistor having both a resistance equal to the line stub characteristic resistance. A delay line may be optionally connected to the line stub for giving to the whole of the delay line and line stub a predetermined propagation time. Thanks to this arrangement, which eliminates the influences of stray capacities in the transistors and their connections, the device is capable of operating at a very high speed.

Transmission line filter circuit

Abstract: A filter circuit stage for pulse shaping having a main shieldgrounded transmission line having a characteristic impedance 2Zo and a time length T terminated at both ends with legs of the same 2Zo impedance and same characteristic time length T. The first leg comprises an open-circuited shield-grounded stub of 2Zo impedance, and the other leg comprises a resistor Zo impedance connected at one end to the main line and at the other end to an open-circuit shield-grounded transmission line stub of Zo impedance. The filter is only required to be connected to a matching impedance of Zo at the juncture of the first leg and the main transmission line. The input transition pulse can be applied at either end of the main line and the output pulse produced at its other end is an ultimate composite of two replicas of the input pulse. Each replica is one-half of the input amplitude. One is delayed by the time length T of the stage and the other is delayed by 3 times the time length of the stage.

Dominant Pole Synthesis of Transmission Line Networks

Abstract: This paper describes a procedure for synthesizing transmission networks which are interconnections of uniform line elements. An iterative, digital computer algorithm is developed which achieves a dominant pole synthesis. The line lengths and the characteristic impedances are controlled individually, which gives design flexibility not found in synthesis procedures based on Richard's transformation. Thus, the characteristic impedances may be restricted by upper and lower bounds when there is no restriction on the line lengths. The procedure is detailed for a TEM mode structure of alternating open stubs and connecting lines. The method uses a Newton-Raphson iterative scheme to adjust the characteristic impedances and lengths of the transmission lines for a prescribed set of dominant transmission poles. If the poles are chosen to give a low-pass characteristic when all of the transmission zeros are at infinity, the finite transmission zeros produced by the stubs modify substantially the transfer characteristic realised. By controlling the stub line lengths and modifying the dominant pole positions an improved transmission characteristic and bounded characteristic impedances can be achieved simultaneously.

Improvements relating to washing machines

Abstract: 1,141,607. Converting rotary motion into oscillatory motion. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. 19 May, 1966 [1 June, 1965], No. 23358/65. Heading F2Q. [Also in Division D1] In a washing machine, a plate-like cover 22 carries an input shaft 1, an output shaft 7 and gearing which converts uni-directional rotation of input shaft 1 into oscillatory-rotary motion of output shaft 7. The gearing comprises a spur gear 4, rotatably mounted on a stub shaft 5, which meshes a pinion 3 on driving shaft 1 and carries a stub shaft 10 to which one end of a link 8 is pivotally connected. The other end of the link 8 is pivotally mounted on a stub shaft 11 carried by a sector gear 9 which is pivotally mounted on a stub shaft 9a and meshes a pinion 6 on the driven shaft 7. A pulley 2 on the driving shaft 1 is driven by a V-belt from an electric motor. A timer drive plate 29 is connected to spur gear 4.

Improvements in or relating to Road-Vehicle Suspension Systems

Abstract: 1,165,976. Vehicle independent suspensions. MECHANICAL SERVICES (TRAILER ENGS.) Ltd. 22 April, 1968 [22 April, 1967], No. 18619/67. Heading B7D. In a spring suspension system comprising stub axles D for a pair of laterally spaced wheels mounted at the free ends of arms C swingable about a common horizontal axis against the resistance of a resilient material in compression, each arm C is provided, at the end and side remote from the stub axle D, with a spindle extending parallel to the stub axle and journalled at at least the outboard end of a square tubular housing A, the remainder B of the spindle being of square section and having a length of rubber or other elastomeric cord H compressed between each face thereof and an adjacent internal corner of the housing A. The housing A is preferably of square section and provided with angle-iron mounting brackets G. In Fig. 5 (not shown), the inner end of the spindle is journalled in the end of the housing.

Pole Synthesis of Transmission Line Networks

Abstract: Abstracf—’llds paper deseribes a procedure for synthesizing transmission networks which are interconnections of uniform line elements. An iterative, digital computer algorithm is developed which achieves a dominant pole synthesis. The line lengths and the characteristic impedances are controlled individually, which gives design flexibility not found in synthesis procedures based on Richards’ transformation. Thus, the characteristic impedances may be restricted by upper and lower bounds when there is no restriction on the line lengths. The procedure is detailed for a TEM mode structure of alternating open stubs and connecting lines. The method uses a Newton-Raphson iterative scheme to adjust the characteristic impedances and lengths of the transmission lines for a prescribed set of dominant transmission poles. By controlling the stub line lengths and the dominant pole positions, the principsd transmission zeros and bounded characteristic impedances can be achieved simultaneously, N ETWORK functions that characterize a lossless transmission line section can be expressed in terms of a single function tanh (s/4~0), where s= u+j~ is the complex frequency, and ~0 is the frequency, in hertz, at which the length of the transmission line element is a quarter wavelength. Using the transformation k =.2 +jfl = tanh (s/4~o) Richards [1] showed that distributed circuits composed of lumped resistors and equal length transmission line elements can be treated exactly as lumped networks in the new variable k. Thus all the power of conventional lumped parameter synthesis techniques is made available to the designers of distributed parameter networks. Richards’ transformation has been successfully employed for the analytical design of distributed networks by Ozaki and Ishii [2], Horton and Wenzel [3], Wenzel [4], and many others. While this transformation has been a powerful tool for the analytic design of distributed structures, techniques based on it have certain weaknesses. Foremost among these is the requirement that all the transmission line elements have the same electrical length. One-half of the available degrees of freedom are being fixed for analytic convenience, and all of the design control rests in the characteristic impedances of the transmission line elements. This can lead to practical difficulty since the range of feasible characteristic impedance is much less than the element value range available with lumped inductances and capacitances.