Showing papers on "Stub (electronics) published in 1987"

Increasing the bandwidth of a microstrip antenna by proximity coupling

Abstract: The letter presents experimental results for a proximity-coupled microstrip patch antenna capable of 13% bandwidth. The impedance match (VSWR ≤ 2), copolarised radiation patterns and crosspolarised radiation were measured over this bandwidth to confirm operation. The construction is quite simple, consisting of a microstrip feedline on a substrate proximity-coupled to a rectangular microstrip patch on a covering superstrate; a small open-circuit tuning stub is connected in shunt with the feed line.

Method of forming stub ends

Abstract: A method of forming stub ends used for joining pipes together by depositing successive layers of weld metal on the outer circumference of a rotating length of pipe. Initial layers having a common forward edge but of decreasing width are deposited to provide metal for the machining of a radius joining the flange to the pipe. Thereafter, successive layers of weld metal of substantially the same width and the same common forward edge are deposited to form the flange. The method is preferably practiced by inert gas shielded pinch arc welding to provide an integral flanged stub end made up completely of weld metal. The resulting structure is substantially uniform and homogeneous with a desirable grain structure, and is pore and defect free. The method further provides economical manufacture of flanged stub ends with relatively little waste of materials.

Ceramic-metal brazed joint for turbochargers

Abstract: A rotor-shaft assembly which includes a ceramic, solid hubbed turbine rotor having an integral stub shaft brazed within one end of a generally cylindrically shaped sleeve member. A metal shaft is either brazed or cold press fitted within the other end of the sleeve member in a torque transmitting relationship. The stub shaft is formed with an annular relief therearound in order to reduce the compressive forces acting on the stub shaft by the sleeve member.

A Very Broadband Matched Termination Utilizing Non-Grounded Radial Lines

Abstract: A novel very broadband termination has been developed, using radial lines in a "shamrock" configuration. Broader bandwidths are achievable than adopting both a conventional straight stub and an "half-moon" configuration. with respect to the latter case, the circumferential mode excitation, that tipically results in a further narrowing of the useful bandwidth, is also avoided. An accurate modelling, developed by the authors, has been used in the design. Good agreement between theory and experiments has been obtained.

Resonant coupled stub in nonradiative dielectric waveguide

Abstract: The properties of resonators for application to filters in non-radiative dielectric waveguide is described. The resonators are very simple and the resonant performance is easily predicted. The resonance is primarily determined by the stub length and not by the tightness of coupling.

Bandstop Filter in Nonradiative Dielectric Waveguide Using Rectangular Resonators

Abstract: A bandstop filter realized by means of rectangular resonators coupled to the center dielectric strip of a nonradiative dielectric (NRD) waveguide is described.This filter has the advantage that it is simple to manufacture, making use of a center dielectric of standard cross section. The design procedure is similar to the conventional strip line design procedure, with the stubs replaced by "stubs" of dielectric, or resonators. The design equations for the stub coupling are derived the properties of the stubs are obtained through measurement.

Improved circular disk 3–dB hybrids

Abstract: Methods of improvement on a planar-circuit-type 3-dB hybrid consisting of a four-port circular disk-shaped resonator are proposed and described. The characteristics of a conventional circular disk hybrid are degraded gradually by higher-order modes of the disk resonator as the ratio of the disk radius to the port width decreases, i.e., as the center frequency becomes higher. This is caused mainly by the fact that the ports arrangement is based only upon the field distribution of the fundamental (1, 1) resonant mode (dipole mode). It is important in practice to prevent the deterioration of the hybrid characteristics because of the suitability of the hybrid for application at relatively high microwave frequencies. This is due to simplicity of its structure, and a small value of the ratio is desired for broadening the bandwidth. From the foregoing viewpoint, the purpose of this paper is to improve the hybrid characteristics without loss of simplicity. Great improvement is obtained by rearrangement of the four ports upon consideration of the higher-order resonant modes and/or addition of a capacitive stub at the circumference of the resonator. Furthermore, the bandwidth of the hybrid is broadened considerably by adding an impedance step between the resonator and each 50-Ω coupling port. These improvements also are confirmed experimentally.

Coaxial cable plug for adapting stepped coaxial cable ends to housing input connecting stubs or the like

Abstract: In the case of a coaxial cable plug (1) for adapting stepped coaxial cable ends (3) to housing input connecting stubs (2) or the like having a contact means (9) for making contact between the stepped outer conductor (4) and the inner surface of the housing input connecting stub (2) and having contact means (14) for making contact with the inner conductor (5), the contact means for the inner conductor being mounted in an insulating plastic supporting body (6), it is intended to improve the quality, especially the good electrical functionality, mechanical robustness and simple production This is achieved in that the contact means (14) for the inner conductor are equipped with inner clasps (15) or the like for mechanical engagement in the outer surface on the inner conductor, and are guided by means of their outer surfaces (13) on inclines (12) on the plastic supporting body (6), which inclines are directed against the withdrawal direction (11) of the inner conductor (5)

Platen for typewriters or similar machines

Abstract: A platen for typewriters or similar machines comprising a platen tube with a resilient outer cover and having stub shaft assemblies press fitted into each end. Each assembly comprises a circular end piece having a central bore into which a stub shaft is press fitted, and a circular plate having a central depression into which one end of the stub shaft is press fitted. The arrangement allows for a platen construction of few easily produced parts which can be easily assembled to provide an inexpensive assembly.

Arrangement for protecting optical and optoelectronic measuring heads, in particular for coordinate measuring machines

Abstract: Arrangement for protecting optical and optoelectronic measuring heads for coordinate measuring machines, having a housing part 1, which can be mounted on the lens cone 9, and in which there is provided in a three-point support a tube stub 8 which concentrically encloses the lens 11 at a distance and on the end of which facing the measurement object there is provided a sleeve 13 which can be moved in the direction of the axis 12 of the lens 11 between two end positions and can be locked in each of these end positions. Switching arrangements 17, 18; 19 which are provided in the housing part 1 and are operationally connected to the tube stub 8 have the effect that damage signals are produced in the event of a rlative movement between the tube stub 8 and housing part 1. A switch 21 which can be actuated by the sleeve 13 and signals the position of the sleeve 13 is provided in one end position of the sleeve 13.

Moving blade made of titanium

Abstract: PURPOSE:To obtain the stub damper structure suitable for a titanium- manufactured moving blade so as to enhance both wear resistance and damping performance, by applying the titanium-beta-alloy padding or flame plating to the stub part of the said moving blade CONSTITUTION:The titanium-beta-alloy like Ti-15Mo-5 Zr, whose wear resistance is about 15 times superior to that of the blade material, is built up by welding on a stub part 1a of a stab damper part 1e in a blade 1 made of Ti-6 Al-4V material or the like This build-up welding of this titanium-beta-alloy is carried out partially in an inactive gas seal atmosphere During this build-up welding, a cooling means is adopted lest a large thermal effect should exercise on the other parts of the blade 1 In addition, as the finishing work to the built-up part 1b, the surface of the built-up part 1b is smoothed out by a grinder, while the parts other than the built-up part 1b are applied with the shot-peening in order to restore the fatigue strength Meanwhile, the WC-flame-plating or the like may be applied to the stub part 1d

Flap support arrangement

Abstract: A transverse pivotable flap is cantilevered between movable sidewall members (10) which include a stub flap (14). A removable central flap portion (18) is secured between the stub flats (10) by a pair of joints (26) having alternating lug sets 28, 30, secured by respective elongated pins (32, 34). Flow area (40) is provided to conduct internal cooling air (16) into the central flap portion (18).

Matching circuit for semiconductor element

Abstract: PURPOSE:To maximize the capability of a semiconductor element and to simply attain it by arranging an adjustment land connected by a metallic wire to a tip of an open stub and connecting the stub in the shortest way in the sending direction of a main line. CONSTITUTION:The microstrip main line 2 is arranged longitudinally to the semiconductor element 3, the microstrip open stub 1 is arranged adjacently to the main line 2, and plural adjusting lands 5 are arranged to the tip of the open stub 1. Further, a mark 7 is formed by the ruggedness of a prescribed pitch to a part of the main line 2. then the adjustment land connected by the metallic wire 6 is arranged to the tip of the open stub 1 and the open stub 1 is connected by using the metallic line 6 in the sending direction of the main line 2 in the shortest way. Thus, the forecast of the circuit operation is attained, the adjustment is much facilitated, the adjustment time is remarkably reduced and the maximum capability of the semiconductor element is simply attained.

Gutter connection stub

Abstract: The invention presents a gutter connection stub which is to be inserted between roof gutter and downpipe or pipe bends, is designed as a tank-type transition part, is suspended on one gutter bead of the roof gutter, can be fastened on the other gutter bead by means of a lug, which is to be laid around said bead, and is connected on the downpipe or on a pipe bend via a discharge stub. The gutter connection stub is typically characterised in that it is provided with means which are formed, in particular, by stamped material and are intended for only temporary, clamping fixing both on the roof gutter and on the downpipe or on the pipe bend. The means, for the clamping fixing of the gutter connection stub both on the roof gutter and on the downpipe or pipe bend, are formed in each case by stamped portions, on the one hand, of the lugs of the gutter connection stub and, on the other hand, of the discharge stub of the latter, and the arrangement at least of the stamped portions in the lugs of the gutter connection stub effects a clamping or latching fixing of the gutter connection stub on the roof gutter by exploiting the resilient properties of the material from which the gutter connection stub is produced.

A Printed Circuit Stub Tuner for Microwave Integrated Circuits

Abstract: A novel microwave tuning eIement capable of continuous adjustment has been realized in the form of a planar printed circuit. As such, it is suitable for incorporation into microwave integrated circuits (MIC's), where it can be used for fine-tuning the impedance match between two parts of a circuit when the two parts are either subject to variations due to manufacturing tolerances or are difficult to model. In either case, the tuner is a compact on-circuit tuning facility which does not have to be removed after use. The tuner has been shown to have unique impedance-transforming properties, being capable of matching any realizable impedance to a 50-Omega load. Its main part consists of a coupled-line section and across the gap in the sectiou at different places along its length are positioned two short-circuit bridge conductors. Movement of these bridges produces the variation in impedance transfomration.

Driving and supporting arrangement for two rotor systems rotating side by side an in opposite directions

Abstract: of EP0272713In the driving and supporting arrangement for disintegrators, the rotor bearers at the drive hubs are mounted directly rotatably by means of a rotor bearing in each case on a common, vibration-absorbing, elastically supported bearing and supply pipe and the ends of the drive hubs are mounted rotatably by means of a drive bearing in each case on an axially movable axle stub in a bearing block in each case.

Measuring instrument for falling speed of blast furnace charge

Abstract: PURPOSE:To take a measurement with high accuracy by installing a microwave antenna in a blast furnace, radiating a microwave to an in-furnace charge, and finding the falling speed of the charge from the Doppler wave period between the sent wave and its reflected wave. CONSTITUTION:This measuring instrument consists of a lance 1 which can scan in a furnace radial direction, the driving device 2 for the lance 1, and a microwave laser 3 mounted on the tip part of the lance 1, and its signal processor 4. The lance 1 is moved radially in the furnace 6 by the driving device 2 to select an optional measurement position in the furnace and stops at the measurement position only for a set time. The microwave oscillated by a microwave oscillator 13 is transmitted from the antenna 8 after passing through a circulator 14 and a stub tuner 15. The microwave which is reflected by the charge and received by the antenna 8 again is inputted to a detector 16 through the stub tuner 15 and circulator 14. The transmitted wave and received waves are mixed and detected by the detector 16 to generate a Doppler signal corresponding to the falling speed of the charge.

Microwave monolithic integrated circuit

Abstract: PURPOSE:To obtain an MMIC in which no grounding circuit is necessary and a forward gate current is suppressed and which has good working efficiency and is capable of being inspected in its characteristic by arranging all the FET and an RF short circuit capacitor provided with electrode terminals and the high resistance of prescribed connection on the same substrate CONSTITUTION:In a microwave monolithic circuit(MMIC) chip 200, a terminal-grounded 1/4 wave length line 50 and a source bias resistance 60 are series-connected to the source terminal 40 of the FET 30, and line 90 of impedance 50OMEGA is connected to the gate terminal 70 of it through a DC blocking capacitor 80, and a short-circuit stub 130 whose terminal is high-frequency-grounded by the RF short-circuit capacitor 120 is connected to the drain terminal 110 of it The high resistance 100 is formed between the grounding side electrode of the capacitor 120 and the terminal 70 In this constitution, the grounding circuit of the terminal 70 need not be provided on a resonance circuit 20 side, and besides, the forward gate current to be generated at the time of the oscillation of large amplitude operation is suppressed by the resistor 100 In a wafer state in which many chips are connected, since the terminal 70 and the terminal 110 are intercepted for a DC, the DC characteristic inspection of the FET 30 can be executed correctly

Hose with connection stub

Abstract: The invention relates to a hose with a connection stub, which is provided fixedly on the end, and with intersecting reinforcing inserts which are arranged between the inner and outer casing, consisting of rubber or rubber-like plastic, and comprise thread spirals which run round the hose in the form of helical lines and are each located one next to the other. The essence of this hose consists in the fact that the reinforcing inserts are resin-bonded within the connection-stub region.

Device for connecting a hose end to a connection stub

Abstract: The invention relates to a device for connecting a hose end to a connection stub, having a bush, used for pushing on the hose end, as constituent part of the connection stub. The clamp enclosing the connection stub comprises at least two part-shells and is connected to a bracing lever closure mechanism, the bracing lever of which is articulated on one part-shell and the spring of which non-releasably connects the bracing lever to a neighbouring part-shell. Provided on the connection stub is a ring attachment over which the retaining flanges, which are located on one side of the part-shells of the bracing lever closure mechanism, engage. The clamping flanges pressing the hose onto the bush are provided on the other side of the part-shells. The invention is characterised in that the ring attachment is formed by a ring which is pushed axially onto the connection stub and fixed at a predetermined point in the axial direction, and in that a ring collar is formed on the connection stub as a stopping surface for a union nut.

A cyclone with forced gas stream whirling

Abstract: of EP0231931A cyclone with forced gas stream whirling, as per this invention, is built up from an inlet chamber of spirally shaped side walls connected to a whirling chamber, wherein a middle pipe (4) is mounted. On the upper part of the middle pipe (4) a worm-wheel (5) is wound, while the lower part of the middle pipe (4) is built up from a number of cylinders (6) of an increasingly smaller diameter, concentrically superimposing one another. From outside, the cylinders (6) are provided with oblique guide vanes (10) and from inside with vanes being in parallel to the axis of the middle pipe (4). In the inlet chamber there are installed an inlet stub pipe (7) and an outlet stub pipe. The whirling chamber terminates in a drain stub pipe (9).

Transmission-line bias T

Abstract: A TEM-mode transmission line comprising an elongate conductor (3) and at least one ground plane (e.g. microstrip) has a short-circuited shunt stub (4) connected to the line for supplying a bias voltage, the stub (4) having a characteristic impedance which is substantially greater than that of the line at the point where the stub (4) is connected. To provide a broad operating bandwidth, the line has a substantial decrease in characteristic impedance in one or both senses along the line towards said point provided by one or a succession of progressively lower impedance-transforming sections (5, 6); the stub and the or each section have the same effective electrical length which suitably is a quarter wavelength at the centre of the operating frequency range. The bias T may be designed as a band-pass filter, and with a succession (5) of three impedance-transforming sections can provide a bandwidth of 10:1.

Microwave attenuator circuit

Abstract: PURPOSE:To obtain a circuit having an attenuation characteristic designed theoretically by acting the 2nd resistor as a stub and cancelling the reactance component caused by the stub formed at a transmission line part connected to the resistor. CONSTITUTION:When the 2nd resistor 7 forms a capacitive reactance equivalently at the operating frequency band, the dimansions are set so that the stub 9 forms an inductive reactance nearly equal to the capacitive reactance and conversely with the 2nd resistor 7 forms the inductive reactance, the dimensions are selected so that the stub forms the capacitive reactance. It is detected how many reactance is formed from the 2nd resistor 7 at the operating frequency band by measuring various parameters of the attenuator circuit, various dimensions of the stub 9 to cancel the reactance are almost obtained by the microwave design technology, and the optimum dimensions are selected by applying trimming after the stub is formed.

Safe door bushing

Abstract: A bushing 10 for a safe door combination lock supports a spindle 20 extending through inner and outer door walls 13 and 12 separated by a space filled with insulation. A stub 15 secured in a hole 17 in the inner wall 13 by a rotational rivet 16 has an axial bore hole and a machined periphery for receiving components of the combination lock. A thin walled tube 11 extends through the bore hole in stub 15 and through the space between the inner and outer walls. An outer end of tube 11 is flared against an outer surface of outer wall 12 and an inner end of tube 11 is flared against an inner end of stub 15. Tube 11 then receives spindle 20 for the combination lock without providing a large heat conductor through the interior of the safe. Also, if tube 11 and spindle 20 are driven into the interior of the safe with a punch, stub 15 retains the tumbler wheels of the combination lock to keep the lock secure.

Ground-working machine for agriculture

Abstract: Ground-working machine for agriculture. The machine has a rotor (2) which is connected releasibly to its two ends and fixedly in terms of rotation to shaft stubs (30) mounted in the frame (1) of the machine. One of the shaft stubs can be driven. Each end of the rotor (2) can be connected to each shaft stub (30). The selective mounting of the rotor (2) in such a way that one rotor end (34) or the other is coupled to the driven shaft stub ensures that, without individual tools (42, 43) being changed over, these first strike the ground with one side or the other, as a result of which different working effects are achieved with tools (42, 43) not arranged radially or with tools designed differently on both sides.

Hinge locking mechanism for wall of collapsible flat

Abstract: A locking mechanism for wall of collapsible flat comprises a latch 19 mounted by a loose pivot 36,37 between plates 25 welded to plank plates 26 which mount corner post 6 The plank plates pivot at 29 to the deck 4 of the flat The latch hooks over the edge of a stub post 28 extending upwards from the deck The wall is prevented from outward pivoting by faces 31 of the plates 25 contacting the upper face of the stub post, when the latch is locked faces 21 and 30 of the latch and stub post respectively prevent inward pivoting of the wall The latch is released by downward pressure on boss 22 which causes the hook part 20 to move up and out of contact with face 30 on the stub post

Structure of radiator fin

Abstract: PURPOSE:To improve the efficiency of heat dissipation by annexing a radiator fin constituted of an inductive stub and a capacitive stub onto a pattern in the vicinity of a heat-generating part for an electronic circuit and dissipating heat without having an effect on the impedance of the electronic circuit. CONSTITUTION:A predetermined pattern 6 consisting of a conductor metal such as copper is formed onto a dielectric substrate 5, and a heat-generating part 2 such as a mini-molded type transistor is loaded on the pattern 6. A radiator fin 7, which is composed of a metal having excellent thermal conduction such as copper and in which an inductive stub 71 and a capacitive stub 72 are shaped in parallel at a regular interval, is bonded so as to cross at a right angle with the pattern 6 on the pattern for an electrode, where heat dissipated from the inside of the electrode for the heat-generating part 2 extremely collects, and near the heat-generating part 2. The inductive stub 71 having length longer than lambda/4 and the capacitive stub 72 having length shorter than lambda/4 are selected so as not to have an effect on circuit impedance and selected so that both admittance is brought to zero at that time.

Length-measuring tool

Abstract: Length-measuring tool, for example a cord (1) with marks, on which there is mounted at least at one end a fastening device for fastening to spatially differing initial measuring points. For the purpose of ease of fastening, for example to a pipe stub or thread, the fastening device is constructed as a clip-on fastening device, for example as a collar-shaped elastic holder (5) or as a screw-on fastening device, for example as a sleeve nut.