Showing papers on "Stub (electronics) published in 1992"

Mobile computer with pen base/keyboard input modes

Abstract: A mobile computer includes a liquid display unit pivoted to a mainframe unit consisted of a keyboard, a floppy diskdrive, a hard diskdrive, a battery power supply and a mother board circuit assembly, wherein the liquid crystal display unit is consisted of a display board revolvably fastened inside a rectangular frame by stub tubes and has a penbase input circuit inserted through the stub tubes for connecting a penbase so that data entry can be made through a penbase as the display board is turned upside down on the rectangular frame.

Back fire helical antenna

Abstract: A first radiation member 165 includes radiation conductors 166 and 167, an arm 168 and a lower connection piece 169 all integrally formed by blanking. A stub 170 is likewise integrally formed on radiation conductor 166. A second radiation member 171 includes radiation conductors 172 and 173, an arm 174 and a lower connection piece 175 all integrally formed by blanking. A stub 176 is likewise integrally formed on radiation conductor 173. A first loop comprised of radiation conductors 167 and 172, arms 168 and 174 and lower connection pieces 169 and 175 exhibits capacitive impedance at a wavelength for use. The overall length of a second loop comprised of radiation conductors 166 and 173, arms 168 and 174 and lower connection pieces 169 and 175 is set equal to that of the first loop. The second loop, however, exhibits inductive impedance at the wavelength for use by adjustment of the length of stubs 170 and 176. Adjusting stubs 170 and 176 enable control of a phase of a current flowing through the second loop.

Optical fiber coupling/connector element

Abstract: An optical fiber connector element comprises a ferrule and an optical fiber stub secured within a through passage of the ferrule. The optical fiber stub comprises a core, an inner cladding having a diameter no more than six times the core diameter and a refractive index less than the core refractive index, and an outer cladding having a refractive index greater than the inner cladding refractive index and less than or equal to the ferrule refractive index. A length of the outer cladding is in intimate contact with the ferrule. A rearward part of the ferrule passage may have an inner diameter greater than the outer diameter of the fiber stub, and a plastic plug having a through passage for receiving the fiber stub may be located in the rearward part of the ferrule passage. The plastic plug has a refractive index equal to or greater than the outer cladding refractive index and less than the ferrule refractive index. The optical fiber connector element provides the convenience of a stub connector while reducing modal interference effects.

Optically controlled remote by-pass switch

Abstract: An optical bypass switch for a fiber optic local area communications network (LAN) with a ring topology allows an optical signal carried on the ring to by pass a node, which includes terminal equipment and a stub cable, associated with the switch. In a non-bypass mode, the optical signal is transmitted to and from the associated terminal. The switch assembly is remote from its associated terminal and includes optical couplers and associated optical receivers and activity detectors to produce electrical signals indicative of an optical input to and output from the terminal. Logic circuitry analyzes these signals and produces an appropriate drive signal for a switch controller. The remote switch has a local power supply and is preferably located at the junction of the ring and an associated, purely dielectric stub cable. The terminal can include a dual path transceiver and bridging equipment to provide cross links between terminals in the event of a link failure to complement the node failure protection of the bypass switch.

A new simple and accurate formula for microstrip radial stub

Abstract: A closed-form formula is derived for the input impedance of the microstrip radial stub. The formula combines the simplicity of the radial transmission line approach and the accuracy of the resonant mode expansion technique. >

Miniature dual mode planar filters

Abstract: A dual mode microstrip resonator (1) usable in the design of microwave communication filters. The substantially square resonator (1) provides paths for a pair of orthogonal signals which are coupled together using a perturbation located in at least one corner of the resonator (1). The perturbation can be introduced by notching (3) the resonator (1) or by adding a metallic or dielectric a stub (83) to the resonator (1).

Stub binding for the filing of loose sheets and interposed sheets

Abstract: The binding (1) has a stub (2) and, emerging from the stub, one or several filing sheets (3, 4, 5, 6, 7). Each sheet comprises one or two vertical strips (8,9) covered with a pressure-sensitive adhesive layer protected by a protective film. The thickness of the strips (adhesive layer and protective film) is equal to the thickness of a compensation sheet (12) provided between two sheets of the binding (1), so as to permit emplacing an interposed filing sheet. The invention is applicable to filing, particularly of account sheets or the like.

Miniature microwave and millimeter wave tuner

Abstract: A miniature, electrostatically actuated, stub tuner which is operable to dynamically tune a transmission line in response to control signals. With the use of integrated circuit processing the transmission line is fabricated on a substrate and at least one stub tuner is fabricated over the substrate and is movable relative to the transmission line in response to electrostatic fields produced when the control signals are selectively applied to rows of control electrodes.

Capacitively loaded microwave cavity resonator with temp. compensation - is frequency-stabilised by gap between stub and wall deformed centrally by thermal expansion of strap

Abstract: The cavity is formed by two walls (W1, W2), a sleeve (M) of circular or square cross-section and a loading stub (BSt) mounted pref. at the centre of the plane wall (W1). All four components are mfd. pref. of Invar or other metal having a low thermal expansion coefft. A strap (Bu) having a higher coefft. of expansion is stretched across the other wall (W2), spaced from it by a central block (K1) and screwed (S1, S2) to the sleeve (M). ADVANTAGE - Frequency of resonance is adjusted automatically to counteract detuning introduced by thermal expansion of entire cavity.

Apparatus for preventing a turbine from exceeding revolution speed

Abstract: An apparatus comprises a first rotational speed detecting device provided on a stub shaft at a position closer to a turbine than a pump, a second revolution speed detecting device provided at the other end of the stub shaft, a comparator for continuously comparing values detected by these first and second rotational speed detecting devices, and a device for tripping the turbine when a difference is determined between the values compared by the comparator.

Monolithic compatible, absorptive, amplitude shaping network

Abstract: The present invention is an equalizer circuit for RF frequencies comprising a microstrip transmission line having a stub tuner extending transversely therefrom and further having resistive means coupled to the stub tuner to de-Q the stub tuner, thereby selectively determining an attenuation profile for the equalizer circuit.

Modeling, simulation, and measurement considerations of high-speed digital buses

Abstract: Some of the major limiting factors of high-speed buses are discussed. It is shown that on loaded backplanes, the propagation delay is a function of the device's trigger threshold. The stub-ringing phenomenon is also discussed. For single, capacitively loaded stubs, the ringing frequency is shown to be lower than what is expected from quasi-lumped models. A simple dual-stub butterfly model is introduced to predict the ringing of backplanes. This model predicts the stub ringing in high-impedance states of TTL buses of high-level states of BTL buses. It is shown that the damping factor of the oscillation depends on the ratio of stub spacing and stub length, and is a very weak function of the termination resistance used at the end of the backplane. >

Handle and handled implement

Abstract: A handle for a handled implement. The handle has a stub, a yoke and a haft. The stub has a shank and a head. The stub has a longitudinal axis. The yoke is disposed on the shank. The yoke abuts the head axially. The yoke is free to rotate about the axis relative to the stub. The yoke has at least one lug disposed in spaced radial relation to the shank. The haft is elongate and engages the head. The haft is joined to the yoke in fixed rotational relation.

Motion insensitive phase compensated coaxial connector

Abstract: In a motion insensitive coaxial cylindrical connector a male member has a substantially cylindrical body having a male or diameter and a substantially cylindrical stub having a minor diameter which stub extends from the body of the male member. The stub fits into a dielectric sleeve within a cavity in a female member. Preferably, the dielectric sleeve has two portions made of different dielectric materials.

Effect of strain rate on cold-formed steel stub columns

Abstract: The material properties of steel and the strength of steel members are affected by strain rate. To investigate this characteristic for compression members, 49 stub columns fabricated from 35XF sheet steel and 48 stub columns fabricated from 50XF sheet steel are studied experimentally and analytically under different strain rates. The strain rate ranged from 10-5 to 0.1 in./in./sec (10-5 to 0.1 mm/mm/s). The material properties of 35XF and 50XF sheet steels developed from previous tests are used for the evaluation of the test data obtained from the member tests using specimens fabricated from the same sheet steel. The results show that the strength of stub columns increased with the strain rate. The amount of increase is found to be dependent on the type of material, the FuFy ratio, the width‐to‐thickness ratio (w/t) of the compression element, and the strain rate used in the tests. The effective width approach included in the American Iron and Steel Institute (AISI) specification for cold‐formed steel mem...

Continuous traverse stub element devices and method for making same

Abstract: A dielectric material is formed into a structure having two parallel broad surfaces with one or more raised integral portions extending transversely across at least one of the broad surfaces. The exterior is uniformly conductively coated (12, 13) resulting in a parallel plate waveguide (10) having a continuous transverse stub element (11) disposed adjacent one plate (13) thereof. Purely reactive elements are formed by leaving the conductive coating on the terminus of the stub element, or by narrowing the terminus of the stub element. Radiating elements (15) are formed when stub elements (11) of moderate height h are opened to free space. Radiating, coupling and/or reactive continuous transverse stub elements may be combined in a common parallel plate structure in order to form a variety of microwave, millimeter wave and quasi-optical components including integrated filters, couplers and antenna arrays. Fabrication of the dielectrically-loaded continuous transverse stub element can be efficiently accomplished by machining, extruding or molding the dielectric structure, followed by uniform conductive plating in order to form the parallel plate transmission line. In the case of antenna applications, machining or grinding is performed on the stub terminus to expose the dielectric material at the end of the stub element.

Conductance Oscillations in a Quantum Wire with a Stub Structure due to Quantum Interference

Abstract: Y-shaped structures of a quantum wire with a stub were fabricated in a split gate configuration Periodic oscillations in the conductance versus split gate voltage curve were observed for the Y-shaped structure of a quantum wire with a stub In contrast, aperiodic conductance oscillations were observed in a Y-shaped branch in which the reflection wall in the stub had been removed The distinct difference between the characteristics of these structures suggests that the observed periodic oscillations were caused by quantum interference in the stub In addition, the calculated gate voltage period based on a model that attributes conductance oscillations to quantum interference in the stub is in good agreement with the experimental period

Frequency balanced six-port reflectometer with a variable test port impedance

Abstract: A source of microwave power is connected to the first, input, port of a six-port device whose second, output, port is connected to a device under test. A variable impedance is connected between the source and the input port. Preferably, the variable impedance is a mechanical three stub tuner. The six-port device includes a first directional coupler whose first input comprises the input port and whose first output comprises the output port. First, second and third hybrid couplers have outputs which constitute the third, fourth, fifth and sixth outputs of the six-port device. A power divider connects the directional coupler to the hybrid couplers.

Negative slope phase skewer

Abstract: A negative slope phase skewer for use between radiating elements of series fed antenna array. The phase skewer has a four part coupler having two segments lying parallel to one another, each segment being a near and a far branch. The two near branches connect to the transmission line, while the far branches are at some distance from the transmission line. A series of spaced apart, progressively longer, high impedance open circuited stubs extends outward perpendicularly from each far branch. Two conductive connections connect the two segments between the transmission line and the stubs. Each stub is designed to be one quarter wavelength long of an average frequency in a band region of an operating band width, and are spaced apart by a quarter wavelength of the midpoint of the operating band.

Waveguide-microstrip line converter

Abstract: PURPOSE:To avoid generation of an undesired resonance and to attain broad band with simple constitution by providing a balanced-unbalanced conversion circuit comprising a short circuit stub of almost 1/4 wavelength between a tapered fin line and a microstrip line CONSTITUTION:An antipodal line stub 6 toward a wall face (on one's right) of a waveguide 5 is formed by a ridge of a conductor film A on an upper side of a board 4 and a conductor film B of a lower side of the board 4 Then the stub 6 is short circuited with a right side wall face of the waveguide 5 The length of the stub 6 is equivalent to a distance from a strip to the waveguide side wall, and when the length is selected to be 1/4 wavelength with respect to the center frequency of the waveguide band, the stub 6 is opened and the transmission wave of a tapered fin line 1 is converted into the transmission wave of a microstrip line 2 The conversion characteristic of the fin line and the microstrip line is improved through the provision of the stub 6, undesired resonance is eliminated and the broad band conversion able to cover the entire waveguide band is attained

Drivepipe guide and installation method for wells

Abstract: Offshore well slots are recovered by cutting off old drive or surface pipe below the mud line to form a stub end. A new drivepipe is installed with a guide and shield device disposed on the scarfed lower end or "mule shoe" of the new drivepipe. The guide and shield device includes a saddle contiguous with the lower end of the new drivepipe having one or more hooks formed on the outer surface thereof for engagement with the stub end to locate the device and the new drivepipe. Shear pins interconnect the new drivepipe with the device and are sheared in response to downward driving action on the new drivepipe or allowing the full weight of the drivepipe to be exerted on the shield device after engagement with the old drivepipe.

Design considerations for comb line microstrip travelling wave antennas

Abstract: An efficient design procedure for microstrip stub traveling wave arrays is presented. The design frequency of 24.125 GHz and the desired sidelobe suppression of more than 20 dB demand an accurate array synthesis and a high fabrication accuracy. Special attention is given to the influence of the T-junction which connects the stub to the microstrip feed line and its overall effect on the radiation mechanism. To demonstrate the quality of the design approach several arrays are shown having one or two excitation ports and main beams 45 degrees off broadside. Considering the design frequency of 24.125 GHz, the scan angle of more than 40 degrees off broadside, and the achieved sidelobe suppression, a considerable improvement has been reached compared to the state of the art. >

Composite electronic parts having open-circuits stub and short-circuited stub

Abstract: This composite electronic part comprises a dielectric layer on which earth electrodes are formed, a dielectric layer on which conductive lines are formed, and a dielectric layer on which electronic parts are pattern-formed. A plurality of the dielectric layers are so laminated that the dielectric layer with the earth electrodes is disposed next to the dielectric layer with the conductive lines. These conductive lines and earth electrodes form strip lines. A short-stub or an open-stub is formed by connecting one end of the conductive line to the earth electrode or opening that one end. A composite electronic part is obtained by connecting the short-stub, open-stub, and the electronic parts.

Characterization of non-symmetric coplanar waveguide discontinuities

Abstract: A general technique to characterize non-symmetric coplanar waveguide (CPW) discontinuities with air-bridges, where the fundamental coplanar and slotline modes may be excited together, is presented. First, the CPW discontinuity without air-bridges is analyzed using the space-domain integral equation method. Second, the parameters (phase, amplitude, and wavelength) of the coplanar and slotline modes are extracted from an amplitude modulated-like standing wave existing in the CPW feeding lines. Then, a 2n*2n generalized scattering matrix of the discontinuity without air-bridges is derived which includes the occurring mode conversion. Finally, this generalized scattering matrix is reduced to an n*n one by enforcing suitable conditions at the ports which correspond to the excited slotline mode. For the purpose of illustration, the method is applied to a shielded nonsymmetric short-end shunt CPW stub, whose scattering parameters are compared with those of a symmetric one. >

Arrangement for reinforcing parts of a wall with a hardenable mass

Abstract: A device for reinforcing a rear surface of a wall includes a receiving bag (4) attached to one end of an axial extending filling stub (1). Webs (3) are attached to the receiving bag (4) and the filling stub (1) so that the webs and receiving bag can be folded from a radially outwardly extending position toward the axis of the filling stub whereby the receiving bag and the webs can be folded into a position so that the combination of the webs (3), the receiving bag (4) and the one end of the stub (1) can be inserted through an opening (6a) in the wall (6). In the inserted position, the webs (3) return to the radially outwardly extending position along with the receiving bag (4) and the bag is filled with a hardenable mass (7) through the filling stub (1). A fixing element (5) is inserted between radially and circumferentially extending ribs (2) on the filling stub (1) located on the opposite side of the wall from the receiving bag (4). The fixing element (5) limits the depth that the filling stub (1) is inserted through the wall. After the mass (7) has hardened, a part of the wall (6) is reinforced at its rear surface by the mass, and fastening elements, such as screws, nails and the like, can be inserted through the wall into the hardened mass.

Rotors for mechanically-driven superchargers

Abstract: of EP0514040A rotor (2) for a mechanically-driven supercharger includes a solid rotor barrel (2a) of aluminium alloy, integral with each of whose ends is a coaxial stub shaft (2b) of aluminium alloy. A rotor shaft (3') of carbon steel is connected to each stub shaft (2b).

Electrical welding torch with fume exhaust - has 2 piece tubular handle, 1 part having hollow cylindrical front part, hose connection stub at back, other part contg. switch

Abstract: Electrical welding torch has a tubular handle (1) consisting of two half shells (2,3), one of which has a hollow cylindrical front part (4) A connecting stub (6) is provided at the rear end for the hoses The front of one half-shell (3) contains the fixed switch housing which has a rear part which can be pushed into recesses (23,24) extending from a mating face (16) and engages in grooves (17,25) of the sloping bearing face (15) of the other half-shell A locking ring is fixed to the connecting stub and holds the half-shells together USE/ADVANTAGE - Pref for torches with fume exhaust, can be assembled easily without tools

Method and device for feeding high frequency power for plasma apparatus

Abstract: PURPOSE:To efficiently transmit high frequency power by eliminating capacity equivalent to the impedance of plasma and using a cable having a characteristic impedance matched with resistance when feeding the power from a high frequency power source to a plasma apparatus. CONSTITUTION:A terminal Q of the power feeding cable is connected through a matching box 14 to a high frequency power source 15, and the high frequency power is sent out. Then, a point P of a power feeding cable 13 is connected to a pair of electrodes 12 for discharging in a plasma chamber 11 of a plasma apparatus 10. At a position separated from the terminal P of the cable 13 for a distance l1, a stub 16 having a length l2 is connected while short-circuiting the tip. The length l2 is decided by the wave length of a high frequency current to be transmitted, and the length l1 is decided by calculating a position, where a standing wave ratio is made minimum, on the cable 13 when connecting the stub 16. Thus, the capacity equivalent to the plasma impedance is eliminated and the resistance is matched with the characteristics impedance of the cable 13.

Modified Stub‐Girder Floor System: Full‐Scale Tests

Abstract: This paper summarizes the results of load tests on two full‐size stub‐girders. The first, specimen M‐1, had a conventional girder‐to‐column connection and the second, specimen M‐2, featured a modified connection in which an extended end stub was connected to the column support. The modified end details offer some economic advantages, greater convenience for the erection and for installation of services. The test specimens were designed as spandrel stub girders for a typical office floor loading and consisted of three continuous spans. The concrete slab was continuous over the end supports of the interior span. The test results indicated that the stub girder with the modified end details is structurally as efficient as the conventional system. Specimen M‐1 failed by shear yielding of the steel girder, while specimen M‐2 failed by crushing of the concrete slab. The measured ultimate loads were 1.58 and 1.81 times the design factored load for specimens M‐1 and M‐2, respectively. Specimen M‐2, with the modifi...

Three-terminal operation of a quantum interference device using a quantum wire with a novel stub structure

Abstract: We describe three-terminal operation of a quantum interference device using a quantum wire with a stub structure Clear periodic conductance oscillations as a function of stub-tuner gate voltage, by which a stub length is independently controlled, were observed The observed periodic conductance oscillations can be explained quite well by taking conductance modulation through the quantum interference of electron waves in the stub into consideration >