Abstract: A radome wall structure includes one or more laminate plies, a first syntactic foam layer on one side of the one or more laminate plies, and a second syntactic foam layer on the other side of the one or more laminate plies. One or more laminate plies are between a third outer syntactic foam layer and the first syntactic foam layer and one or more laminate plies are between a fourth inner syntactic foam layer and the second syntactic foam layer. An interior matching layer is adhered to the fourth inner syntactic foam layer.

Abstract: An antenna assembly and related methods are described. The antenna assembly (1) comprises an extendible mast (2) constructed and arranged so as to be configurable between a coiled form and an extended form. The extended mast (2) is resiliently biased in the form of an elongate tube having a slit along its length. The coiled mast is wound about an axis extending transversely to the longitudinal extent of the mast. An antenna (6) is integrally coupled to the mast such that when extended, the mast supports and positions the antenna, and when coiled, the mast and antenna are coiled together.

Abstract: A radar antenna is provided. The radar antenna includes an antenna body, a housing housing a plurality of components for controlling the antenna body, and a ventilation path formed in a predetermined ventilating direction and penetrating the housing. One or more of the plurality of components are disposed inside the housing to be separated from the rest of the components with respect to the ventilation path therebetween.

Abstract: An electromagnetic anechoic chamber includes an anechoic chamber, an adjusting apparatus, and an antenna device. The anechoic chamber includes a bottom wall defining a rectangular receiving space, and a shielding plate supported on a bottom wall. The adjusting apparatus is received in the receiving space and includes a supporting bracket, two adjusting pulleys respectively installed to two opposite ends of the supporting bracket, and a transmission belt wrapping around the adjusting pulleys. The antenna device includes a base slidably supported on the supporting bracket and an adjusting pole perpendicularly extending up from the base. The adjusting pole extends through the transmission belt and the shielding plate. A motor drives one of the adjusting pulleys to rotate, the transmission belt is moved through the adjusting pulley to move the antenna device.

Abstract: A subsurface deployable antenna array is provided which expands upon deployment and contracts for storage to provide an antenna array that can be stored in a comparatively compact space. Electronically interconnected antenna modules are connected by expandable/contractable connectors. A helically-organized bundle of optical cables and electrical wiring are utilized in the expandable/contractable connectors. Mechanical, electrical, or hydraulic means may be utilized to control the spacing between the antenna modules.

Abstract: A signal receiving mechanism includes a cord reel, a cord wound around the cord reel, a signal receiving element assembled to a top of the cord reel, a grounding unit, and a pivot unit for rotatably connecting the cord reel to the grounding unit. The cord reel includes a hollow tubular body having a horizontal inner annular section. The cord includes a first and a second wire, inner ends of which are extended into the hollow tubular body below the inner annular section. The signal receiving element has a lower end downward extended through the inner annular section to electrically connect to the first wire of the cord. The grounding unit includes a first annular conductive plate, which is set at an underside of the inner annular section to electrically connect to the second wire of the cord, and is in contact with a conduction module for grounding.

Abstract: The retractable cable device includes a base, a rotary portion, a spring, a cover, and at least two medal plates. The rotary portion cooperates with the base to form a cavity, and the cable is disposed on the rotary portion. The spring is disposed in the cavity for driving the rotary portion to rotate. The cover is coupled to the base. The metal plate is connected to the rotary portion for maintaining an electrical connection between the antenna and the cable when the rotary portion rotates.

Abstract: A lightweight active phased array antenna including modular active electronics assemblies and passive radiating element aperture panels that are integrated into a lightweight support structure of a minimum depth which provides a cooling system for the electronics assemblies. The electronics assemblies and aperture panels are fully accessible from one or both faces of the antenna and can be readily removed/replaced as required.

Abstract: A pedestal system comprises a base having a lower cylinder and an upper rotatably supported with respect to the lower vertical cylinder. A lower motor is coupled between the lower and upper cylinders to selectively cause rotational motion between the cylinders. Also provided is a top-most horizontal cylinder with a rotating shaft. The shaft has a bearing coupling the top-most horizontal shaft with respect to the upper vertical cylinder. Finally, an upper motor is provided. The upper motor is coupled between the top-most horizontal shaft and upper cylinder to selectively cause a rotational motion between the top-most horizontal shaft and the upper vertical cylinders.

Abstract: A system and apparatus for deployment of a decoy from a moving object, such as an aircraft, to protect the aircraft from an enemy missile. The decoy is stored in a housing mounted on the aircraft and is connected by a cable containing fiber optics and high voltage conductors. The cable is stored on a spool which is reciprocally moveable along a rotating shaft provided with a double helix and which is located coaxially within an outer rotatable de-bailer. The cable is drawn through a passage formed in an outer cylindrical side wall and end wall of the de-bailer as the decoy is deployed from the aircraft. The cable causes the de-bailer to rotate about the spool which reciprocates back and forth along the double helix shaft. The spool is connected to the helix of the shaft by a pawl and a brake mechanism controls the rotational speed of the shaft, and thus the payout speed of the cable.

Abstract: To provide connecting means between an antenna structure, which is in a PC main body, and a PC card that does not have an extruding section. There are included a housing 8, an antenna structure, a slot 10 of the housing into which a PC card is inserted, a high frequency cable 5 one end of which is connected to the antenna structure electrically and part of which is pulled outside the housing, a connector plug 6 that is connected to the other end of the high frequency cable 5 electrically and is outside the housing, and an elastic body such as rubber 13 which is configured so that the high frequency cable is pulled inside the housing.

Abstract: A flexible antenna cable is deployed or retrieved by movement along a helical path through an enclosure passage formed between internal surfaces of an assembly within which a plurality of cable pulleys are disposed in contact with the cable for exercising drive control over cable movement. A plurality of solid inserts shaped to occupy spaces between the pulleys within the helical passage, preclude buckling of the antenna cable during deployment and thereby prevent jamming.

Abstract: A transmitter (12) for a remote control convenience system (10) has a housing (22). A pushbutton (e.g., one of 24-30) is located on the sousing (22) and is manually actuatable for requesting remote control performance of a function by a remotely located receiver (14). Transmit circuitry (32) of the transmitter (12) is located within the housing (22) and is operatively connected to the pushbuttons (e.g., one of 24-30). The transmit circuitry (32) outputs an electrical signal that conveys a message requesting performance of the function in response to actuation of the pushbutton. A flexible antenna (34) is operatively connected to receive the electrical signal from the transmit circuitry (32) and to output a signal (18) intended for reception by the receiver (14). The antenna (34) has a stored position coiled inside the housing (22) and an extended position extending outside of the housing.

Abstract: A power antenna for automatically stopping an electric motor when a telescoping trouble occurs with the antenna to thereby cause a load of more than a predetermined magnitude to be applied to the electric motor and preventing the electric motor from being burned out and a telescoping operating mechanism from getting damaged, whereby the occurrence of an erroneous operation of the antenna such as repeated contracting and expanding operations thereof can be controlled. A worm wheel (2) inside an antenna mechanism is pivotally supported in such a manner as to slide in an axial direction and an engagement groove (21) is formed in an annular fashion, and an operating portion (32) of a movable body (17) of a limit switch (30) provided in a driving circuit for the motor is brought into engagement with the engagement groove (21) of the worm wheel.

Abstract: Continously variable-length antenna, operating in a wide frequency range that's simple, lightweight and reliable, and can be constructed by using a metal case-resided, coiled steel band spring returnable metal tape for the actual antenna, and pulling or releasing it by a thin insulating line. A strong, lightweight insulating tube, guiding the metal tape in its mechanical excursions, also provides for weatherproof construction. Remote controlling and an extremely wide range of antenna lengths can easily be realized.

Abstract: A retractable antenna for a communications device includes a housing; an elongated, flexible antenna mast having an inner end and an outer free end; a take-up spool rotatably mounted in the housing, the inner end of the mast secured to the take-up spool; and a connector extending from the housing and adapted to be received in a communications device housing.

Abstract: The invention relates to a device for positioning antennas, the device comprising an assembly having an antenna-carrier mast movably mounted in a reserve provided between a particular absorbent wall of the measurement chamber and the adjacent wall of the envelope of the chamber; the mast passes through the particular wall via an associated slot to extend into the measurement chamber, each antenna is mounted to slide along the mast without interfering mechanically with any other antenna carried by the mast, thereby making it possible to position a desired antenna at a desired location while retracting the other antennas inside the reserve, behind the above-mentioned particular wall.

Abstract: A retractable distributed array antenna has a multiplicity of radiative elements arranged in a beam-forming array of desired configuration and resolvable into a plurality C of columns, with each column having at least one of the antenna radiator elements. Each of a number P of elongated column members, up to but not exceeding C in number, supports the antenna elements of an associated column. The column members are arranged with their elongated dimension generally parallel to one another. The adjacent end portions of each pair of column member, or of a column member and a central stowage module, are joined by a spring-loaded hinge assembly, which urges the joined column member end portions away from each other, to place the columns of elements into the desired distributed array antenna configuration, if no retroactive forces are present.

Abstract: A drum is used to wind and unwind conductors that comprise the elements of an adjustable dipole antenna. The length of the elements is adjusted by rotating the drum. As the elements are unwound, they extend into tubular TEFLON guides that provide support for the elements.

Abstract: A deployable crossed log-periodic dipole array antenna includes a plurality of bays, each associated with four elongated, flexible antenna elements, each element having an S-shaped cross-section for stiffness. Each bay also includes a spool. The spools have a "squared circle" shape adapted to the natural curvature of the antenna elements. A drum surrounds and is coaxial with all the spools, and the antenna elements extend through apertures in the drum. Rotation of the drum winds and unwinds the flexible antenna elements from their spools simultaneously. When the drum begins to wind for retraction of the elements toward a stowed condition, some bays are arranged so that the elements begin to wind about the spools immediately, whereas other bays are arranged so that the antenna elements rotate about hinges over an angle such as 90.degree. or 180.degree. before beginning to wind onto their spools.

Abstract: A deployable crossed log-periodic dipole array antenna includes a plurality of bays, each associated with four elongated, flexible antenna elements, each element having an S-shaped cross-section for stiffness. Each bay also includes a spool. The spools have a "squared circle" shape adapted to the natural curvature of the antenna elements. A drum surrounds and is coaxial with all the spools, and the antenna elements extend through apertures in the drum. Rotation of the drum winds and unwinds the flexible antenna elements from their spools simultaneously. When the drum begins to wind for retraction of the elements toward a stowed condition, some bays are arranged so that the elements begin to wind about the spools immediately, whereas other bays are arranged so that the antenna elements rotate about hinges over an angle such as 90.degree. or 180.degree. before beginning to wind onto their spools.

Abstract: A lens assembly for a window shade radar includes two adjacent membranes rolled onto separate rollers. Expandable side masts are pivotally secured to the rollers and the collapsible main beams by slip joints. The main beams enclose wire busses which are directly connected to the membrane modular elements without interposed rotary connections.

Abstract: An antenna device includes a base, a metal band having two opposite ends, a reel disposed within the base and having one end of the band connected thereto for winding the band thereon, the opposite end of the band being received in the base, and a guide receives the band outside the base for forming the band into substantially horizontal and vertical components, and for adjusting the length of the horizontal and vertical components of the band.

Abstract: A reusable portable device for providing location data by a lost individual as well as a signal enhancer for radios or other signal emitting devices. The device is in the form of a briefcase size unit containing a deflated airfoil with air brake and a gas cylinder containing ligher-than-air gas such as helium. The helium is released into the airfoil and is temporarily sealed with a clip. A signal emitting tether line attaches to the airfoil at one end and a reel at the other end. The reel contains a trim capacitor to adjust frequency of the antenna to different signal emitting devices which may be attached to the reel. Incorporated into the reel is a lightning arrestor which can be attached to an anchor permitting use in adverse weather. The reel may adjust the height of the airfoil and bring it back to the ground to be deflated and reused another time.

Abstract: A flexible antenna which operates to control both the reactance as well as the resistance of the antenna. A motorized pulley system attached between two supports is utilized to control the effectrive length of the wire as well as the height of the antenna above ground. The antenna includes a flat base portion suspended between the supports and leg portions extending from the base to the apex of the triangle close to the ground. The total length of the antenna as well as the height of the base portion above the ground is dependent upon the particular frequency which is to be transmitted or received.

Abstract: In an electrically powered mechanism for expanding and contracting antenna in which an operation strip coupled to antenna overcoat members that are telescopically connected to expand or contract, is expanded or contracted by a rotary member driven by a motor, and the operation strip has a width greater than the thickness thereof, and has arcuate surfaces or flat surfaces; the rotary member is rotatably provided in a case body which is provided with an annular guide portion with a guide groove for guiding the operation strip to the side of the drum and to the side of the antenna overcoat members, and a strip-receiving groove is formed along said rotary member into which the operation strip is fitted; and the operation strip is fitted in a curved manner to the strip-receiving groove, and a torque for delivering or pulling the operation strip when the rotary member is roated is so selected as to produce a required holding force depending upon the thickness of the operation strip, the radius of curvature of the s

Abstract: A flexible cord and antenna is paid out at a controlled rate from a radiosonde as it is lifted into the upper atmosphere by a balloon. The cord is knit into a tubular body and folded into a compartment in the radiosonde. The extended end is wrapped around the rotor of a centrifugal brake which limits the pay out rate. The knit tubular body unravels as the cord and antenna are paid out.

Abstract: A telescopic mast is provided in kit form with stays wound on reels in a predetermined order. This order is such that when erecting the mast it is only necessary to walk between the mast and pegs fixed into the ground and not between two pegs at a distance from the mast. This minimizes the amount of walking which is necessary in erecting the mast. Clamps between sections are formed from a strap around the outer of two concentric sections. The ends of the strap are secured together and attached to a member with a pressure face. A camming device between this member and the mast which acts against the pressure face and the mast enables the strap to be tightened thus gripping the outer mast portion against the inner mast portion. The top section of a telescopic mast is less inherent rigidity than the bottom section and this it is preferable to construct it from material with a greater resistance to longitudinal bending than the lower section and to vary the resistance of the intermediate sections accordingly.

Abstract: A transportable wireless communication system and method for employing lightweight, compact, low profile surface deployed current drivers which are capable of rapid deployment and quick retrieval and which are used for inducing ground currents in the earth so as to send and receive electromagnetic signals propagated through the atmosphere over a wide bandwidth. The impedance of the current driver and earth is adjusted to match the impedance of a transmitter/receiver connected thereto. The current driver is capacitively coupled to the earth so that the current driver and the earth effectively function together as a vertical plane polarized antenna which propagates a vertically polarized electromagnetic signal. The system utilizes either a single current driver or, where increased signal gain is desired, an array of current drivers spaced in parallel. A unidirectional vertically polarized signal may be produced by shortening the length of one current driver conducting arm with respect to the other arm.

Abstract: An extensible antenna, particularly for automobiles, incorporates a plurality of inter-connectable elements which are separated and wound on separate reels when the antenna is retracted. The antenna elements pass from the reels through a connecting mechanism, such as a plurality of rollers, to be connected together for extension of the antenna. The antenna elements each are formed with a longitudinal groove on one surface and a longitudinal projection on another surface, and are shaped so that the projection on one element is pressed into engagement with a corresponding groove on the next adjacent element by the rollers as the antenna is extended, to form a connected antenna.

Abstract: A novel broadband antenna system which is both portable and easily deployed. The system comprises a power splitter, one or more element feed units, and one or more conductive antenna cables, each cable being wound around a reel.Each reel is releasably secured on an end of an element feed unit. Each element feed unit comprises an impedance matching network, and the element feed units also include a novel clip. The clip functions both to releasably retain a reel on an end of the element feed unit during transportation and storage and to electrically and mechanically connect a conductive antenna cable to the element feed unit when the antenna system is being used.In use, the element feed units are connected to the power splitter, and the power splitter is connected to a transmitter/receiver device. One or more conductive antenna cables are then connected to the element feed units using the novel clips.

Abstract: A portable roll-out antenna system which forms a compact, transportable assembly when not being used. The roll-out antenna system is provided with flexible antenna elements which are individually wound onto reels for storage and transportation, and rolled out for use as an efficient antenna system. Each pair of antenna elements is connected to a balun for proper connection to unbalanced connecting cables. The baluns are housed in an end-cap assembly upon which are mounted the antenna element reels when the antenna system is not being used. A power splitter allows more than one connecting cable to be electrically coupled to a remote transmitter/receiver by way of a transmission line. The power splitter is housed in a center reel assembly which is provided with a component to lockably receive part of the end-cap assembly upon which is mounted the antenna-element reels, thus holding the antenna-element reels together and forming a compact, transportable assembly.

Abstract: The present invention relates to an airborne trailing cable-antenna which is multi-sectional. The cable-antenna comprises an electromagnetic radiating portion for the transmission of electromagnetic energy and a non-radiating portion which because of its weight, length, density and other aerodynamic characteristics provides the physical length necessary for the propagation of the radiated electromagnetic energy in a vertical polarized plane. This improved, multi-sectional, trailing, airborne cable-antenna facilitates the transmission of electromagnetic energy in a vertical polarized plane at higher frequencies not previously possible.

Abstract: A flattened resilient sheet metal band prestressed to assume the shape of an extended tubular rod when unstressed, is stored as a coil wound on a spool. The end of the band is fixed to a post. When the coil is released, the band assumes its tubular shape and the end of the band fixed to the post encircles the post. A clamp responsive to the change in shape of end of the band clamps it to the post when the band assumes its tubular rod shape.

Abstract: The present invention is directed to a wireless fracture-mapping tool utilized for determining fracture directional and length characteristics of hydraulically induced fractures in subterranean earth formations containing recoverable energy values. The apparatus of the present invention utilizes antenna packages from which a transmitting antenna is propelled from a wellbore penetrating the earth formation into the fracture system. Signal-receiving antennas disposed on opposite sides of the transmitting antenna are likewise propelled into the fracture system for receiving signals from the transmitting antenna that are indicative of the fracture orientation and length. With the present invention the axial and singular three-dimensional location of the fracture or other fracture profiles may be readily mapped.

Abstract: An extendible tubular boom includes a metallic ribbon which is prestressed to assume a rigid tubular shape when extended and which can be flattened and coiled for storage, and a plurality of conductive foil strips fixed to the ribbon which provides electrical paths between sensors located at the tip of the boom remote from the spacecraft and electronics located within the spacecraft. Remote positioning of sensors permits the measurement of parameters of the local plasma without the perturbing effect of the presence of the main body of the spacecraft. The conductive foil strips are electrically isolated from the metallic ribbon comprising the boom structure by a layer of insulating material. Both the foil strips and the insulating layer are sufficiently flexible so as to withstand the transverse and longitudinal stresses encountered as the boom is furled and unfurled.

Abstract: A bi-directional underwater communication system provides a submerged operator with the capability to communicate with a surface site. A face-mask-mounted microphone and an earphone are connected to a submerged, watertight radio. The radio antenna cable is carried by a buoy to the surface of the body of water in which the operator is submerged.

Abstract: Transmission lines using tubular extendible elements in which two such elements are combined to form a coaxial type transmission line or a two-wire transmission line and in which a single element is constructed as a two-wire transmission line and tubular extendible elements and other structures using materials having various temperature coefficients.

Abstract: An antenna has a housing at least one opening with a drum rotatably mounted in said housing perpendicular to the opening and a wave receiving stylus carried by the drum for projection from the housing through said opening. The stylus is a band preformed according to a given curved shape about its longitudinal axis with the band being sufficiently resilient so as to be flattened and wound up on the drum and being sufficiently flexible so as to assume a tubular configuration in cross-section in the absence of stress when in a position extended from the housing. Idler rollers are carried by the housing around the drum in spaced relation thereto to limit band sliding frictions with respect to the housing and guide elements are interposed between the idler rollers to promote a correct superimposition of the band spirals on and off the drum.

Abstract: An extensible antenna assembly defined by a strip wound into a coil and extensible out of the coil through a guide for forming the strip into an elongated tubular length. In two embodiments the strip is made of a metal whereby the tubular length establishes the antenna for radiating and receiving radio frequency energy and the coiled or wound coil portion defines a coil integrally coupled and electrically continuous with the tubular portion to define a variable inductive reactance for automatically maintaining the antenna resonant to a predetermined frequency in correlation with and responsive to the extended position of the antenna. An insulating means, comprising a strip in the first embodiment and a conical spindle in the second embodiment, insulates the turns of the strip defining the coil and is configured to change the inductance of the coil non-linearly in response to linear movement of the antenna.

Abstract: Transmission lines using tubular extendible elements in which two such elements are combined to form a coaxial type transmission line or a two-wire transmission line and in which a single element is constructed as a two-wire transmission line and tubular extendible elements and other structures using materials having various temperature coefficients.

Abstract: A buoy is towed by a submerged submarine through means of an electro-mechanical cable. A cable reel is disposed in the buoy to store an inflatable buoyant cable having a pressure accumulator containing a medium under a given pressure attached to one end of the buoyant cable adjacent the outer surface of the buoy. The other end of the buoyant cable is attached to the cable reel. Through slip rings connected to the cable reel and a conductor connected between the slip rings and the electro-mechanical cable radio communication with a submerged submarine is possible employing the buoyant cable when it is deployed and inflated. An arrangement in the buoy associated with the buoyant cable and the cable reel assists in deploying and retrieving the buoyant cable with the deploying and retrieving of the buoyant cable being under the control of sea pressure acting on the buoyant cable.

Abstract: This antenna arrangement includes a primary buoy connected to the submarine through a first electro-mechanical cable, a secondary buoy carrying an antenna connected to the primary buoy by a second electro-mechanical cable and a system contained within the primary buoy connected to the second cable to automatically control the deploying and the retrieving of the secondary buoy and to provide electrical continuity between the first and second cables. The deployment of the secondary buoy is produced primarily by hydrodynamic forces rather than only hydrostatic forces.

Abstract: The antenna structure possesses a multi-sided configuration with means being provided for equally changing the lengths of at least two sides facing each other to thereby adjustably vary the physical size of the antenna. A parasitic reflector having a similar configuration and means for adjustability is positioned a predetermined distance behind the antenna proper for increasing the gain of the antenna structure.