Showing papers on "Stub (electronics) published in 1970"

A New Class of Distributed Prototype Filters with Applications to Mixed Lumped/Distributed Component Design

Abstract: The distributed prototype filter consists of a cascade of shunt stubs of equal length alternating with uniform transmission lines, each of twice the stub length. If the stubs are open circuited, they may be replaced by lumped capacitors to synthesize a mixed lumped/distributed (L/D) filter having near optimum Chebyshev or Zolotarev characteristics. The rate of cutoff and the general character of the stopband region is predictable. The use of Zolotarev prototypes enables the impedance level within the filter to be controlled and gives greater selectivity. Designs suitable for either transverse electromagnetic (TEM) line or waveguide low-pass filters are presented. If the stubs are short-circuited, the prototype may be used to design quasi-high-pass or bandpass filters of very large bandwidth. An example is given of an inductive-iris-type filter of approximately 100-percent bandwidth for which previous theories have been unsuitable. The theory is capable of extension to more complicated mixed L/D structures containing both series and shunt elements.

Surface Wave Grating Reflectors and Resonators

Abstract: The realization of complex microsound circuits would be greatly facilitated if one were able, efficiently to reflect the surface waves. For example, such reflectors are required for making a "short-circuited" stub, or for a low mode-order resonator. It is known that the interdigital transducer can reflect a surface wave, with rather low losses; however, this approach involves the use of an external inductive tuning circuit, which must be attached to the transducer in order to resonate its self-capacitance. It is therefore a method which cannot be used in those situations where the primary objective is the achievement of very large component densities.

Valve position indicating system

Abstract: A valve position indicator particularly suited for use with valves having a first shaft driven by an operator and a second stub shaft for journaling the valve member. A piece of magnetically conductive material is imbedded in an end of the stub shaft which protrudes from the valve casing and which is received in a housing formed in part of magnetically conductive material. Within the housing is a pair of magnetic pole pieces each having an electrical winding associated therewith. One of the windings is connected to AC power while the other may be connected to a meter so that, dependent upon the position of the magnetically conductive material imbedded in the stub shaft and thus the position of the valve, a greater or a lesser amount of current will be induced in the second winding with the amount of current induced in the second winding being indicative of the valve position.

Impedance transformers for microwave transmission lines

Abstract: In an impedance matching transformer for a microwave transmission line wherein a pair of orthogonal rectangular waveguides are joined by a rotatable coaxial line including an inner conductor protruding into the interior of one of the waveguides to act as an impedance matching probe, an adjustable screw is provided through a wall of the one waveguide positioned right above the probe to attain impedance matching.

Microwave balanced mixer circuit

Abstract: A balanced microwave mixer for converting a microwave input signal to an intermediate frequency output using a microwave carrier as a local oscillator signal with the two microwave signals combined and divided out through two signal carrier lines via a hybrid ''''rat race'''' circuit ring. The two signal carrier lines are connected respectively one to the anode of a mixer diode and the other to the cathode of another mixer diode the opposite IF side electrodes of which are dc circuit interconnected via IF output circuitry connected thereto. Harmonic suppression filters are employed both at the inputs and outputs of the mixer diodes, and input signal quarter wavelength long outer end grounded stubs are also provided closely adjacent the mixer diodes on the RF signal input sides thereof. Low impedance RF termination stubs are provided at the diode IF outputs with each connected to an IF combining RF reactive onequarter RF signal wavelength long stub through high impedance lines of similar length and, further, a high impedance line of similar length interconnects the IF combining stub to an RF rejection filter in turn connected to an IF amplifier.

Sonic apparatus for drilling and stub setting

Abstract: This invention is a method and apparatus for facilitating the driving and anchoring of a tool, bolt, or fastening device in a refractory material or other material with the result that the tool, bolt or fastening device is firmly fastened in the material. Reference is made to the claims for a legal definition of the invention.

Replaceable traffic barrier gate

Abstract: A traffic barrier gate, adapted to be selectively raised from or lowered to a barrier position, wherein a wooden barrier arm is inserted into the mouth of a fitting provided with a jaw which may be manually opened to permit an end portion of the barrier arm to be moved into or out of the fitting mouth, or closed to retain the arm end portion firmly within the fitting. The device makes it possible to easily remove the stub of the arm from the fitting whenever the arm is broken off, and to quickly reinsert and lock into place an end of the remaining or a new arm.

Method and apparatus for separating mixtures of fine grain materials

Abstract: Installation for separating a mixture of particles of two different materials, one of which materials has an affinity for a gas into fractions in which with a cylindrical tank in one wall having a centrally positioned inlet stub for a mixture of the materials for separation, in the other end wall of the tank a centrally disposed outlet for part of the liquid together with one fraction of the mixture, a tangential liquid inlet stub near the central inlet stub and a tangential outlet stub near the other end wall thereof, said outlet stub adapted for discharging the part of the liquid together with the other fraction of the mixture and there being means for commingling the gas with the liquid introduced.

Tube coupling for large diameter tubes

Abstract: A tube coupling for large diameter tubes is comprised of a coupling body having a camming mouth, a tube stub with an integra ferrule, and a coupling nut adapted to retain the ferrule of the tube stub in sealing engagement with the camming mouth The tube stub is adapted to be interconnected into a fluid line by welding or otherwise securing the free end of the tube stub to a tube or other conduit

Wheel-type exercise device

Abstract: The present invention comprises an exerciser device taking the form of an annular tilted platform or support having a central stub shaft or the like. The platform is provided with means for enabling hand and foot placement, this so that the user, by shifting his weight, may revolve the device about an axis disposed proximate the point of contact of the stub shaft with its support plane. The stub shaft may be supported and/or journaled by appropriate means when desired.

Microwave Networks with Equiripple Delay Characteristics

Abstract: The problem of finding a characteristic polynomial to provide equiripple delay characteristics in commensurate TEM microwave networks is solved numerically. These polynomials enable the synthesis of such filters in the form of cascaded transmission lines or in the form of stub filters to be undertaken. Results for the orders 2 through 6 are presented. The synthesis of constant delay all-pass networks can also be performed and the method for doing so is presented. The attenuation characteristic corresponding to the equiripple delay filter does not, of course, possess a sharp cutoff, since these filters are of the minimum phase type.

Lumped-Elements in Microwave Integrated Circuits in the 1-12 GHZ Range

Abstract: Lumped elements have found increasing use in microwave integrated circuits at low UHF and S-band frequencies. At this laboratory they have been used in various circuits such as filters, quadrature hybrids, and impedance matching networks for high-power transistor amplifiers. Limiting the use of lumped elements has been: (1) the uncertainties of the reactance and Q's of the elements at frequencies above 2.5 GHz, and (2) the difficulty of fabricating the high-Q components necessary for large impedance transformations to low-impedance active devices. The past difficulty in measuring the reactance and Q values above S-band has been the unavailability of a measurement system at high frequencies that is compatible with the size of the element. However, suitable resonant techniques have now been developed for frequencies from 1 to 12 GHZ. Lumped inductors and capacitors fabricated at this Iaboratory have been measured by these new techniques. The results demonstrate that high-Q capacitors have been achieved by recent improvements in thin-film dielectric processing, and that capacitors and single-turn inductors are "truly lumped" through 10 GHz.

System for improving signal-to-noise ratio of a communication signal

Abstract: A superconductive resonant cavity is energized with radiofrequency energy. The cavity includes a tuning stub having a piece of semiconductor material mounted on the end thereof. An incoming communication signal modulates a light source optically coupled to the semiconductor by a fiber optic bundle. This varies the dielectric constant of the semiconductor which, in turn, varies the resonant frequency of the cavity. An angle modulation demodulator senses the frequency of the radio-frequency oscillations in the cavity and produces a replica of the communication signal with improved signal-to-noise ratio.

Wide band balun

Abstract: A wide band balun for connecting an unbalanced coaxial input line to a balanced load. The input line is separated into a first and a second portion by a gap in its outer conductor. The balun achieves wide band operation by the use of two short circuited stubs in shunt with respect to the gap and an open circuited stub in series with respect to the gap.

Archery bow with removable inserts to vary draw force

Abstract: An archery bow having a handle, a pair of limbs and a pair of stub members selected from a plurality of stub members having different lengths. All of the stub members are substantially shorter than the limbs. The inner ends of the limbs and the inner ends of the stub members are respectively removably secured to the handle ends with the inner ends of the stub members being respectively sandwiched between the handle ends and the belly sides of the limbs adjacent their inner ends. The limbs and stub members respectively extending outwardly from the handle ends in side-by-side relationship. The outer ends of the stub members respectively engage the belly sides of the limbs intermediate the ends of the latter when the bow is strung and cooperate therewith to provide a draw weight determined by the length of the selected stub member.

Microwave power density meter

Abstract: A power density meter for monitoring the energy density of an electromagnetic field, having a first radiant field and a stationary field, in the near-zone region of an electromagnetic apparatus. The power density meter comprises an antenna arrangement having a conical horn, a stub, an output portion and an input portion. The electromagnetic wave energy of the radiant field is received by the horn and stub. The input portion is located in front of the horn and comprises a sheet of lossy material sandwiched between a pair of thin sheets of plastic. When the lossy material is brought into the stationary field, a current is induced into the material which is representative of the electromagnetic energy of the stationary field. The current established in the lossy material generates a second radiant field which is additive to the first radiant field of the electromagnetic wave energy. The output portion includes a cryster detector receiving the combined electromagnetic energy from the first and second radiant fields. A circuit is provided for coupling the detector to a meter so that a signal representative of the value of the power density in the near-zone region may be displayed on the meter.

Railway flat car having stub center sills

Abstract: A railway flat car having a plurality of spaced beams extending longitudinally of the car, each beam being of generally uniform dimensions and forming an upper lading support surface especially for relatively heavy items such as steel ingots, slabs, coils, billets, and the like. A shear plate is secured beneath the beams adjacent each end of the car and a stub center sill structure is secured beneath the shear plate adjacent each end of the car. The center sill structure terminates at a cross bearer member secured beneath the beams and extending transversely the entire width of the car.

Digital data processing system having a signal distribution system

Abstract: Logic signals are distributed to a plurality of logic cards in a digital computer. Each logic card taps into a motherboard transmission line with a conductor stub. Signal distribution on the motherboard is along a transmission line of a primary system impedance up to a first stub. At the first stub, signal distribution continues along a secondary impedance line of a suitable impedance such that signal discontinuities due to stubs and loads will be minimized. At a last stub signal distribution continues along a transmission line of the primary system impedance and is terminated in the primary impedance.

Method for making an underwater pipeline connection

Abstract: A lateral pipeline being laid is connected to a main pipeline lying on the bottom of the ocean by a tie-in assembly that is connected to the lateral line above the surface of the water The main line is equipped with a stub section of pipeline to which the lateral is to be connected The angle between the lateral and the main line is measured and from this the tie-in assembly is designed This assembly also includes two ball and socket type joints that permit limited misalignment between the sections of the tie-in assembly and the stub section of the pipeline connected to the main line and also allows relative rotation between at least two portions of the tie-in assembly A connector assembly is used to connect the tie-in assembly to the stub pipeline section An actuator is releasably connected to the tie-in assembly above the surface of the water and lowered with the tie-in assembly into the water to actuate the connector assembly to connect the tie-in assembly and the stub pipeline section This actuator can then be recovered and used again

Compact drive assembly for a paper disinte - grator

Abstract: The disintegrating or cutting cylinders are driven through a high ratio reduction gearbox provided with a short motor stub shaft a small part only of which projects out of the bearing pedestal. The shaft is hollow in order to receive the stub shaft of a pinion having no more than eight teeth which have an offset evolute profile and which mesh with a gear mounted on the shaft of the disintegrating or cutting cylinder.

Center plate fan wheel and shaft construction

Abstract: A center plate fan wheel and shaft assembly having two stub shafts secured to opposite sides of the center plate, with each stub shaft end adjacent the center plate being enlarged and hollowed to form enlarged diameter ring shaped shaft end mounting flanges thus providing a ring of thermal and mechanical contact at the center plate, and with each side of the center plate being provided with a countersunk ring surface in which the shaft flanges are seated, and with fastening bolts extending through the flanges and center plate.

Improvements relating to Furnaces

Abstract: 1,194,035. Rollerway conveyers for furnaces. GIBBONS BROS. Ltd. 16 Aug., 1968 [22 Aug., 1967], No. 38609/67. Heading F4B. A continuous furnace for the firing of ceramics or heat treatment of metals comprises a rollerway conveyer with hollow ceramic or alloy rollers 101 with ends disposed in openings 105 in the side walls 102 and stub shafts 106 passing through bearings 107, each stub shaft carrying a counterweight 108 providing compensating bending moment for the blocks 109 carried by the rollers. Alternate rollers have longer and shorter stub shaft's with the weights adjusted to provide even moments. Gas burners 103, 104 are disposed in the side walls near the roof and floor respectively. Alternatively, the compensating bending moment can be applied through springs or fluid pressure motors applied between supplementary shaft bearings and a fixed part of the kiln. In the latter case the pressure may be applied in groups and in response to load detecting means. The stub shafts may be disposed in the ends of the rollers as disclosed in Specification 1,107,481.

Norton TLM Based Stub-link Conversion Technique

Abstract: This paper presents a fast and efficient way of simulating multistage power electronic circuits with stages operating at widely separated frequencies, using the Norton transmission line modelling (TLM) technique. A multistage circuit can be decoupled into several sub-circuits which can then be simulated individually with different time steps according to their circuit time constants. Energy exchange between linked sub-circuits are made possible via the use of a stub-link conversion technique. Simulation is carried out using a forward voltage converter circuit. Results are compared with those from PSpice.