Abstract: A resonant cavity such as a diplexer filter and a coaxial resonator, for example, wherein its interior resonant cavity structure is packed with a powdered polytetrafluoroethylene material to prevent arcing within the resonant cavity structure due to the multipacting phenomenon.

Abstract: A tapped delay line transversal filter utilizing both surface acoustic wave and charge coupled device technologies, the surface acoustic wave tapped delay line portion providing a coarse selection and the charge coupled device tapped delay line portion providing vernier weighting.

Abstract: A method of eliminating a substantial portion of the nonlinear effects that occur in passive microwave devices operating under relatively high power conditions by use of small lightweight permanent magnets about the device structure while monitoring the level of such undesired signals.

Abstract: The specification describes a cylinder lock including a plurality of driver and associated follower pins movably residing in axially alignable bores in the lock core and cylinder, the lock also including spheres normally located in notches in the outer extremity of core cylinder wall, one or more of the spheres moving to a position between associated driver and follower pins preventing the alignment of these associated pins at the peripheral surface of the core when the follower or tumbler pins are manipulated without the use of a properly designed key.

Abstract: A horn antenna is disclosed having a built-in circular polarizer and a cross polarization attenuator. A square-apertured horn antenna has a plurality of pairs of conductive fins disposed along opposite edges of the horn interior. The individual fins are separated from each other by approximately one-fourth wavelength. The fins are at a 45 degree angle to that linear wave and react with that linear wave by imparting a circular rotation to that wave as the wave propagates past each pair of fins. A stepped attenuator is mounted in the input section to the horn antenna perpendicular to the linear input wave. The attenuator substantially absorbs cross-polarized signals whether reflected from the aperture of the horn or provided by the incoming signal.

Abstract: There is described a hermetic coaxial cable particularly adapted to be produced in miniature form and having a completely solid cross section with a solid metal central conductor, a tubular metal outer conductor, and a continuous glass dielectric insulator therebetween.

Abstract: A conical horn antenna is disclosed having dual dielectric bands mounted therein for improving the rotational symmetry or elipticity of the radiated beam as well as the efficiency. The first and second dielectric bands are coaxially mounted to each other and to the conical horn. The lengths of the bands are determined by the frequencies being propagated. A circularly polarized dominant wave such as TE.sub.11 mode is applied to the antenna and excites a series of higher order waves such as the TM.sub.11 mode. The circularly polarized dominant and the higher order modes are propagated toward the aperture where they are in phase and therefore add vectorially. The dual dielectric band acts as a slow wave structure and higher order waves which in turn provide an improved phasing between the dominant modes.

Abstract: A wideband synchronously pumped parametric amplifier is described that features minimum time delay along with wide bandwidth, a low noise figure and cost for advantageous use in receivers designed to receive television signals from a satellite through a relatively small antenna, the amplifier obtaining maximum bandwidth by the use of two diodes in parallel and two double-tuned circuits, where the diode capacities are large enough to swamp parasitic and coupling capacitances.

Abstract: A surface acoustic wave device embodying a novel technique of weighting the tapping amplitude of an interdigital surface acoustic wave transducer, the amplitude weights being implemented by means of planar resistors deposited so that one is connected in series with each sampling electrode of the interdigital transducer.

Abstract: A polarization selective screen allowing only electromagnetic waves having a desired linear polarization to pass therethrough, the screen includes an array of relatively thin, parallel and evenly spaced conductive flat ribbons supported between end portions of a frame structure, the broad surface of the ribbons being orthogonal to the plane of the screen and being supported and maintained in place under a predetermined tensional force by tension means such as spring-loaded ribbon hangers.

Abstract: A TEM-mode transmission line switch coupling essentially all input power at a first port to a fourth port when in its uncoupled position and coupling a predetermined significant fraction of the input power to a second port with the remainder coupled to the fourth port when in its coupled position, the switch including a relatively wide spaced parallel transmission line section with a rotatable conductive vane disposed between the parallel lines to allow coupling of power between the lines in the coupled position and inhibit such coupling in the uncoupled position.

Abstract: A bulk acoustic wave delay line adapted to increase triple-transit signal suppression by selective aperture limiting, the device including a bulk acoustic wave-supporting body having a planar end face at each end of the bulk acoustic wave propagation path, the device also including an annular absorbing structure disposed on at least one of the end faces immediately adjacent to and surrounding a transducer for absorbing the portion of the propagating bulk acoustic wave energy impinging on an end face not covered by the transducer.

Abstract: A frequency scan antenna utilizing either parallel or series beam spoiling for increasing the radar beam width and increasing the data rate is disclosed. As a radar beam is scanned from the horizon to a maximum altitude or angle above the horizon, the beam width is broadened or spoiled, thereby allowing a higher data rate collection and storage. A first embodiment according to the present invention utilizes coaxial cables of incrementally varying lengths connecting the delay line with an array of parallel line source radiators. The cables having the minimum length are connected at the extreme radiators while the maximum length cables are connected at the center line source radiators. The wavefront is bowed and a greater sector in space may be scanned. A second embodiment of the present invention utilizes a delay line with unequal tap spacings which is series coupled to the array of line source radiators.

Abstract: An improved folding chair structure having a pair of parallel frame tubes and a pair of parallel support tubes that are laterally foldable, each pair held in respective parallel relationships by front and rear x-braces, and also included is a pair of parallel seat tubes the rear end of which being pivotally attached to a fixed intermediate point along an associated support tube, the structure further including a separate guide movably mounted along intermediate portions of each of the frame tubes, the guides being pivotally attached to the upper ends of associated brace members of both the front and rear x-braces and also to an associated one of the seat tubes whereby the collapsing of the structure by moving the parallel frame, support and seat tubes together causes the guides to move upwardly while the angle between the planes defined by the respective frame and support tubes and between the planes defined by the respective support and seat tubes, decreases.

Abstract: A transmission system for use in a communications satellite is disclosed which utilizes a power divider providing equal power output from N output ports having a uniform phase progression from port to port, the sense of which depends upon which of two input ports is excited. In an illustrated embodiment, one input port generates a first sense of circular polarization and the other generates the opposite sense. The two oppositely polarized circular waves are applied to the multiphase power divider. The cylindrical-bodied power divider has N output ports, where N is an odd integer, arranged at 360.degree./N about the cylindrical surface. Disposed within the power divider is an N-bladed septa for providing power division and isolation. A 180.degree. phase inverter is connected to (N-1)/2 output ports for providing a wave having a phase progression of 180.degree./N from the power divider.

Abstract: A surface acoustic wave device wherein a reflective array is disposed on a surface of material capable of supporting propagating surface acoustic wave energy, the array including a plurality of spaced, parallel elements having longitudinal axes angularly oriented with respect to the direction of a beam path of propagating straight crested phase fronts, the device also including matching structures disposed adjacent the leading and trailing ends of the elements for converting the normal mode, straight crested phase front outside the reflective array region to the normal mode, sawtoothed shaped, phase front within the reflective array region, and the reverse thereof, and thereby avoid diffractive effects at the entry and exit points of the reflective array.

Abstract: A mode-converting type bulk acoustic wave delay line adapted to suppress triple transit signals and provide response tailoring, the device including a body of acoustic wave supporting material with at least one mode-converting planar surface capable of reversably converting longitudinal wave mode acoustic energy to shear wave mode acoustic energy, the device also including an attenuating structure disposed on the mode-converting planar surface for absorbing a predetermined amount of propagating shear wave mode energy and thereby increase insertion loss.

Abstract: Hammock portion of a tiltable stretcher supports the lower half of patient at a first elevation in prone position while a tray portion of the stretcher supports head, arms and shoulders at lower elevation until stretcher is swung to a near-vertical position where tray may be adjusted to a suitable angle facilitating reading, eating, playing games and the like. The device may be provided with handrims which drop below level of stretcher in horizontal position to eliminate obstacles during patient transfer.

Abstract: A surface acoustic wave device having spaced tapping output transducers disposed in the path of surface acoustic wave energy propagating along a planar substrate surface from an input transducer. The device including an ion-etched groove array disposed in the planar surface between the tapping transducers to reduce acoustic wave reflections at desired frequencies within a desired passband and suppress spurious signal-producing surface acoustic wave reflections.

Abstract: A table having a table top writing surface and adapted to house a concealed sewing machine and the like until needed, the table including a movable machine storing drawer having a lower surface above the normal knee level which sloped downward toward the rear, the machine being mounted on a plate arranged in the drawer with a lifting mechanism that moves the plate flush with the table top when the drawer is in its extended position and that moves the plate downward to bring the machine into a position within the drawer to allow the drawer to be pushed into its retracted position beneath the table top.