Showing papers on "Stub (electronics) published in 1977"

Triband vehicle antenna

Abstract: An antenna for simultaneous connection to a citizen's band transceiver, an AM receiver and a FM receiver, particularly suitable for use on a vehicle such as an automobile. The antenna proper is a center-loaded upstanding rod which, in the preferred form, telescopes downwardly to a retracted position where it does not protrude above the ground plane. The antenna proper is connected to a T-connected open stub transmission line and to a FM resonant relatively high impedance signal-carrying transmission line. The former has inductive reactance in the FM band which offsets the capacitive reactance of the relatively short effective length of the antenna proper in the FM frequencies. The signal-carrying transmission line is substantially half wave in length in the FM band so as to reflect impedance at its far end substantially equal to the impedance present at the T-connection. The signal-carrying transmission line is also of length that provides resonant action transforming the relatively low impedance at the T-connection or base of the antenna in the CB band to a higher impedance, such as 50 ohms, at the end of that transmission line. Finally, the signal-carrying transmission line, because of its relatively high characteristic impedance, has very low capacitance and therefore does not tend to load the AM radio. The end of the signal-carrying transmission line is connected to the input terminal of splitter containing resonant circuits which are in turn connected to two transmission lines, one leading to the CB transceiver and the other leading to the AM/FM radio.

Gas turbine having a ceramic rotor

Abstract: A ceramic turbine rotor fitted to a metal shaft has an integral shaft stub, extending into the hollow end of the metal shaft, and is resiliently retained therein. In order to prevent relative rotation between the rotor and the shaft during torque transfer, the stub shaft and a clamping and tightening member, within the metal shaft, are provided with interengaging parts. The stub shaft, the clamping member and the hollow metal shaft may be formed with mating, interengaging corrugations and grooves running substantially axially. The stub shaft may alternatively have a polygonal cross section, and the clamping member and the void in the hollow shaft will then have mating, but successively bigger cross sections.

Sliding support for a superconducting generator rotor

Abstract: The sliding support connection of the inner rotor to the rotating outer rotor and stub shaft of the generator power train is closed by a flexible diaphragm which has protruding axially therefrom a plurality of integrally attached fingers. These fingers, at an outside radial surface, bear into a complementary cylindrical cavity in the end of the stub shaft having female spline receiving concavities. The fingers on their inside dimension define a frustoconical surface which bears against a spring loaded frustoconical mandrel, preferably loaded by a Belleville spring. During thermal axial excursion incident to cool down, the fingers by sliding into and out of the spline concavities in the stub shaft accommodate relative axial movement of the inner rotor relative to the outer rotor. During on-line operation of the rotor, the fingers maintain a positive and nonsliding fit with the stub shaft so that by positive outward pressure at the fingers, slip and fretting corrosion of the fingers and stub shaft is prevented. All necessary rotational flexure of the inner rotor is taken by the flexible diaphragm closing the inner rotor.

Input Impedance of Coaxial Line to Circular Waveguide Feed

Abstract: The expressions for the real, imaginary parts of the input impedance seen by a coaxial line driving a thin cylindrical probe in a dominant TE/sub 11/ mode circular waveguide are derived. The analysis is carried out by assuming that the cylindrical post is replaced by a curvilinear strip having maximum width equal to the diameter of the probe. Theoretical results on input VSWR and input impedance seen by a coaxial line are in close agreement with experimental data.

Thermoplastic pipe stub end

Abstract: An improved thermoplastic pipe stub end for welding to thermoplastic pipe is disclosed. The stub end has a flange portion integrally joined to a neck portion which has inner and outer surfaces and terminates at a welding face. The improvement resides in the reduction of the length of neck portion such that it extends from the flange a distance in millimeters of not greater than 1.5 √O.D., where O.D. is the outer diameter in centimeters of the neck portion at the welding face. The improved stub end permits higher strength heat welds to be made by butt fusion between the thermoplastic stub end and a thermoplastic pipe to be joined thereto.

Transfer Function Approximations for a New Class of Bandpass Distributed Network Structures

Abstract: Characteristic functions for a new class of prototype bandpass transmission-line structures have been derived for both the maximally flat and equiripple or Chebyshev characteristics The class of bandpass distributed structures considered in this paper consists of commensurate transmission lines with constraints in the form of a shunt open-circuited stub and/or a series short-circuited stub The gain-bandwidth restrictions imposed by the reactance constraints have been derived and some explicit results are presented for the synthesis of this class of bandpass transmission-line networks Results presented in this paper are directly applicable to the design of broad-band microwave passive and active networks In particular, the results are applied to the design of broad-band matching networks for octave-band GaAs FET amplifiers

Multiway pipe junction for hydraulic pipes - has base member for selective attachment of stub pipes by friction welding

Abstract: The multiway pipe junction esp. for hydraulic pipes comprises a base member (1) of prismatic pref. cubic shape to which stub branch pipes (2) are connected by adhering or welding. The base member has holes at right angles to its surfaces and meeting at its centre. The branch pipes pref. have bevels (3) which fit opposite bevels at the mouths of the holes. The branch pipes may be joined in the base member at surfaces where the latter does not already have a hole, and the hole may be drilled using the branch pipes as a pilot. The joining may be by friction welding.

Allochirally divided connector for tubular frame members

Abstract: The invention relates to a member for assembling tubular elements designed to form a two-dimensional or three-dimensional structure. Such member comprises two half-shells which can be nested one on the other, thus defining a passage for a tube of the structure, and having stub tubes onto which the other tubes are to be fitted.

Single-stub transmission line elements in communication networks

Abstract: An element in a transmission line network consists of a single, short, open-ended stub which is attached to a transmission line at a single station on that line and which has a characteristic impedance of one-half that of the line. The stub acts on a passing wavefront to: first, reduce the forward voltage for the momentary duration of the two-way transit time within the stub; then, to restore the forward voltage completely and without ringing. With the addition of a high-input-impedance amplifier, an improvement in communication branching is obtained.

Connector for multiple pipes - has flexible stub ducts for connection to individual flexible hose lines

Abstract: The pipe connector for multiple pipe lines has a body connectable at one side to rigid ducts and provided at the other side with individual flexible stub ducts (2) connectable to respective flexible hose lines (6). The body and stub ducts are an integral moulding of elastomeric material. The hose lines are connected to the stub ducts by short individual connectors (8). The arrangement enables the hose lines to be deflected without strain at their junction with the body. The body may have a metal reinforcement and be provided with flanges for connection to a support.

Microwave equalizer with coaxial cable resonant stubs

Abstract: An improved, more compact microwave equalizer is provided by utilizing a length of coaxial transmission line to which at least a pair of relatively small diameter, flexible, coaxial cable resonant stubs are coupled through film type impedance means. Each coaxial cable stub is disposed adjacent the outer conductor of the transmission line, for compactness, and the length of each stub is minimized by use of high dielectric constant material therein. By shortening the length of each resonant stub and by shunting a capacitor across each resonant stub, the frequencies of the upper and lower band edges of the equalizer's attenuation curve are spread apart, while simultaneously providing the desired operating frequency band. Slots and/or an annular recess provided in the relatively thick outer conductor of the transmission line receive the stubs and the retaining apparatus for the film type impedance means. The characteristic impedance of the equalizer is maintained relatively constant throughout its length by providing air dielectric in the region of the structure in the internal diameter of the outer conductor portion associated with said annular recess. The voltage standing wave ratio of the equalizer may be improved by providing a slightly reduced diameter, and a corresponding air gap in the surrounding dielectric material, for a portion of the central series conductor of the transmission line which is located between the coupling points of the stubs.

A method for handling free cells through critical point drying.

Abstract: SUMMARY A method is described in which free cells were dehydrated in suspension, put on double-coated tape attached to a specimen stub and dried from CO2. The method provides a simple, fast means of handling free cells when using the critical point method of drying.

Conformal Dielectric-Filled Edge-Slot Antennas for Bodies of Revolution

Abstract: : A class of circumferential-slot antennas that are ideally suited for conformal mounting on conducting bodies of revolution has been developed. The simplest form of the antenna is a disk of dielectric substrate that is copper- plated on both sides and mounted between two parts of the conducting body so that the aperture coincides with the surface. The antenna is excited by a single coaxial stub at the center and is tuned for proper operating frequency by inductive posts that connect the two copper-plated sides of the disk. By varying the number and location of the inductive posts, the operating frequency of a single antenna can be tuned over a six-to-one range. In practice, plated-through holes are used as inductive posts in order to provide mounting and access holes. The single coaxial feed excites azimuthally symmetric fields that are not significantly distorted by the symmetrically placed inductive posts. Therefore, radiation patterns of edge-slot excited bodies display a high degree of azimuthal symmetry. The small size, light weight and inexpensive fabrication procedure make the edge-slot attractive for many applications.

Method for introducing a high voltage conductor into a television cathode ray tube

Abstract: A method of introducing a high voltage electrical conductor through the neck of a television cathode ray tube comprising the providing of a gun-base assembly comprising a hollow glass stub tubulation on one end of which is an annular glass base carrying an electron gun assembly. On the distal end of the stub tubulation is temporarily secured a hollow holder. An electrical conductor is provided which passes through the stub tubulation. The gun-base assembly is inserted into the neck and hermetically bonded to the neck. The cathode ray tube is evacuated through the stub tubulation and the temporary holder. Heat is applied circumferentially to the stub tubulation to soften and pinch off the tubulation, sealing the evacuated tube against re-entry of air. The temporary holder is detached from the stub tubulation to form a cup in the end of the tubulation for receiving an electrical connector.

Compact suspension for beam axle - with trailing arms and single vertical brace in pivotted sleeve for lateral stability

Abstract: The beam axle (2) is supported on trailing arms pivotted on the chassis and is braced by two sets of vertical dampers. One set (3) provides simple vertical support while the other set (6) has a vertical stub which is located in a sleeve (13) pivoted on the side of the chassis. This provides lateral stability without affecting the vertical movement. The pivotted sleeve replaces the large and heavy triangular pivot frame on the beam axles. It enables low profile suspensions to be used. Only one stub and sleeve are required on each axle. On tandem axles the stub and sleeve systems are on opposite sides of adjacent axles.

Metal shearing machine with vertically descending mobile cutter - guided by rollers which are laterally adjustable via stub axle offset on rotatable mounting stud

Abstract: The metal shearing machine incorporates a series of rollers (8, and 8') which guide the vertically descending mobile cutter block (5) The lateral station of the rollers can be adjusted to compensate for wear of the cutting plaques Roller adjustability is contrived by mounting them on stub axles (19), of which the axies are offset relative to a rotatable friction locking support shaft (92) The support shaft (92) extends to the rear of the stub (19) and is used to mount the axles and thus individual roller on the machine sub-frame (11) The axis of the shaft is parallel to that of the stub axle and the shaft itself (92) may be tapered cone-form In the latter case a nut (16) motivated expanding cone-form sleeve (14) is used to lock the shaft (92) in the hole (14) in the sub-frame (11)

Gain-Bandwidth Limitations and Synthesis of Single-Stub Bandpass Transmission-Line Structures

Abstract: Gain-bandwidth limitations and synthesis of a class of bandpass transmission-line structures with a single shunted stub and n cascaded commensurate lines are presented in this paper. With a shunt shorted stub as the reactive constraint, the optimum gain bandwidth is derived for an ideal bandpass gain characteristic. Explicit gain-bandwidth and synthesis results have been obtained for the class of single-stub cascaded line structures with one and two cascaded lines for both maximally flat and Chebyshev characteristics. For the general case of n cascaded lines approximate gain-bandwidth limitations have also been derived. The explicit results including gain-bandwidth limitations and element values can be used for the design of this class of bandpass transmission-line networks for broad-band matching of the reactive constraint as well as impedance transformation.

Apparatus for coupling microwave energy from two oscillators to a common transmission line

Abstract: A microwave system provides signals of two separate microwave frequencies, designated F.sub.(1) and F.sub.(2), alternately or simultaneously to a common coaxial transmission line by combining the outputs of two microwave frequency oscillators of frequencies F.sub.(1) and F.sub.(2). Each oscillator contains a waveguide output with which is associated at least one means, such as a resonant iris, for passing microwave energy of the oscillator's design frequency and for reflecting microwave energy of other frequencies, such as the different frequency of the other oscillator. A waveguide type transmission line is provided having first and second input ends and which line is of a length so as to be nonresonant at either of the two oscillator frequencies, F.sub.(1) or F.sub.(2). Each oscillator is coupled to a corresponding one of the two input ends of the waveguide. The waveguide is of a length in which signals of frequency F.sub.(1) form a field maxima at a certain location along the waveguide and in which signals of frequency F.sub.(2) form a field maxima along the waveguide at essentially the same said location. A microwave energy coupling probe is positioned in the waveguide at the location thereby defined to extract the microwave energy from the waveguide.

Carbon electrode production

Abstract: A method including baking two carbon articles in a chamber, wherein the improvement comprises the steps of: A. providing a protrusion and a stub hole on a face of one of the articles and arranging the articles side by side in the chamber with said protrusion and said stub hole located between the articles, whereby during baking any bonding between the articles is limited to the region of the protrusion so that the articles can later be separated with relative ease, and B. subsequently baking the carbon articles in the presence of a carbonaceous particulate support, with the carbonaceous particulate support being present in the stub holes, whereby the prevention of stub hole distortion and adjoining carbon article blistering is improved.

Pushpull mixer with oscillator signal input decoupling - has insulating plate with slotted line recess in metal coating and stripline end connected to 2 mixer diodes

Abstract: The stripline pushpull mixer has low noise, high decoupling between oscillator and signal inputs over a wide band and is used to construct a double pushpull mixer. An insulating plate, metallised on both sides, has a recess in its metal coating on one side forming a slotted line. On the other side opposite the slotted line, a stripline is located with its ends connected to the two mixer diodes. This stripline overlaps the slotted line by roughly lambda/4. The diodes are located between the stripline and lambda/4 stub lines.

Permeation method of potting agent for sealing stub cable

Abstract: PURPOSE:The air between twisted wires of a stub cable is compulsorily excluded by the use of a vacuum pump to form the vacuum state and the potting agent is permeated in every nook and corner between twisted wires, then the reliability on air-tightness is improved.

Shut-off valve for gas supply - includes electrical insulation to separate gas mains from domestic line

Abstract: Shut-off valve for domestic gas supply has an electrical insulation introduced to separate the domestic gas line from the main gas supply. The valve has a housing (1) contg. a closure member (2) and provided with two stub ducts (4) for the mains and the domestic line respectively. One of the stub ducts contains a metallic lining (5) for connection of a pipe. The periphery of the lining is separated from the inside of a counterbore in the stub duct by an insulating sleeve (9) and the end of the lining is separated from the bottom of the counterbore by an insulating washer (8).

Adapter for preloading bearings

Abstract: An adapter particularly suited for use in preloading bearings in the final drive of a crawler-type vehicle, including a plate adapted to be mounted concentrically with the sprocket shaft of a final drive, securing devices associated with the plate for securing the plate in concentric relation to the sprocket shaft, a stub shaft extending from one side of the plate, an arm rotatably mounted on the stub shaft and having a radial part extending beyond the periphery of the plate and an axial part terminating in an end on the side of the plate opposite of the stub shaft, a jaw mounted on the end of the arm and adapted to engage a bearing adjusting nut on the final drive, and a torque receiving formation on the arm for receiving a rotative force from a torque wrench or the like and being generally concentrically located with respect to the stub shaft.

Simple multisample stage for the scanning electron microscope

Abstract: The stage is made by drilling a large stub so that it will receive three small stubs. The rotary control allows all three stubs to be viewed.

Anti-jam apparatus for baseband radar systems

Abstract: A filter which highly attenuates CW signals within specified frequency bands while allowing baseband pulses to pass therethrough with relatively low attenuation is provided. The filter comprises a main transmission line and stub transmission lines that are coupled in parallel relationship with the main transmission line. Each of the stub transmission lines is terminated with a short circuit or other appropriate impedance and is of such a length that a pulse coupled thereto from the main transmission line and reflected from the terminating impedance will arrive at the coupling plane with the main transmission line after the pulse propagating on the main transmission line has completely passed the coupling plane, thus eliminating the possibility of cancellation of any portion of the propagating pulse. The length, spacing and terminating impedance of each of the stub transmission lines is selected to provide stop bands for CW signals so that a pulse is coupled to the output terminals of the filter that is substantially free of CW interfering signals that may exist at the input terminals thereof.