Abstract: In a glass antenna for a windshield such as a side windshield located at either side of a passenger compartment of an automotive vehicle, a feed terminal is disposed on a proximity to a first corner of the windshield, a substantially letters shaped antenna element comprising: a first wire segment (3a, 3b, 3a′) extended from the feed terminal at the proximity to the first corner toward a substantially opposite direction to the first corner along at least a first side edge of the windshield, a second wire segment (3c) is extended from a tip of the first wire segment toward a proximity to a center of a second side edge of the windshield, a third wire segment (3d) is extended from a tip of the second wire segment toward a proximity to a second corner of the windshield which is opposite to the first corner, a fourth wire segment (3e) is extended from a tip of the third wire segment toward a substantially opposite direction to the second corner along a third edge of the windshield, and a plurality of other an

Abstract: The present invention relates to a rigid surface reflecting electromagnetic waves, especially for antenna reflectors, electromagnetic shielding, and waveguides. According to the invention, this surface consists of an interlacement (7) of electrically conducting wires (2, 3) which consist, on the surface, of a stable metal diffusion alloy ensuring that said wires are fastened together and that said surface is rigidified.

Abstract: The invention discloses a transmission device comprising an antenna having a plurality of aerial wires uniformly distributed regularly in a helix about a cylindrical generatrix, and means for feeding the aerial wires with a radio frequency signal. The invention is characterized in that the means for feeding produces an equi-phase and equi-amplitude signal which directly feeds the plurality of aerial wires.

Abstract: A serrated slot antenna includes two annular conductors separated by a slot having a serrated edge. A shorting post connects the annular conductors to each other at some point along the slot. The slot antenna can be made, e.g., by affixing conductive tape to a flexible substrate, photoetching a pattern in the copper-clad surface of a flexible substrate, or machining material from a conductive tubing.

Abstract: In a glass antenna for a windshield such as a side windshield located at either side of a passenger compartment of an automotive vehicle, a feed terminal is disposed on a proximity to a first corner of the windshield, a substantially letter-S shaped antenna element comprising: a first wire segment (3a, 3b, 3a′) extended from the feed terminal at the proximity to the first corner toward a substantially opposite direction to the first corner along at least a first side edge of the windshield, a second wire segment (3c) is extended from a tip of the first wire segment toward a proximity to a center of a second side edge of the windshield, a third wire segment (3d) is extended from a tip of the second wire segment toward a proximity to a second corner of the windshield which is opposite to the first corner, a fourth wire segment (3e) is extended from a tip of the third wire segment toward a substantially opposite direction to the second corner along a third edge of the windshield, and a plurality of other a

Abstract: A system and method are disclosed for deploying a plurality of point-to-point receiver transmitter pairs such that the main beam of transmitting radio does not point directly at any receiving radio antenna other than the desired receiving antenna. A three dimensional lattice matrix deploying nodes in different horizontal planes and aligning the nodes such that nodes of a particular row of nodes do not point directly at one another is used. Accordingly, particular horizontal and vertical angles, ideally greater than ½ the main beamwidth, are used to align nodes of the lattice. Additionally, inter-nodal distances and polarization isolation are taught to improve mutual interference.

Abstract: An antenna-oriented reflecting material using triaxial woven fabric is usable for frequency bands as high as 20-60 GHz. A reflecting material 1 usable for the high frequency bands is manufactured without spoiling advantages of triaxial woven fabric 2 by controlling mainly a construction n, a volume resistivity .rho. and a mass per unit length .eta. of the triaxial woven fabric. Particularly the setting of each parameter is determined by a composite model reflection ratio .GAMMA. obtained from a sum of a first reflection ratio .GAMMA.'s based on a surface resistance of the triaxial woven fabric and a second reflection ratio .GAMMA.p based on opening, holes of the triaxial woven fabric. It is preferable that a construction be 5-28 yards/in a mass per unit length .eta. be 10-460 tex g/1000 m, and a volume resistivity .rho. be 0.7 to 2.0.times.10.sup.-3 .OMEGA..multidot.cm.

Abstract: The invention relates to high stiffness parabolic structures utilizing integral reinforced grids. The parabolic structures implement the use of isogrid structures which incorporate unique and efficient orthotropic patterns for efficient stiffness and structural stability.

Abstract: A light weight parallel plate polarizer (100) employs a sandwich construction design including a polarizer section (102) and a foundation section (104). The polarizer section (102) is formed from low dielectric constant, low density foam or honeycomb layers (112) alternating with polarizer panels (110). The foundation section (104), which supports the polarizer section (102), is formed from a low density, low dielectric constant foundation material. In an alternate embodiment of the present invention, the light weight parallel plate polarizer employs a suspension design (400). The suspension design (400) includes individual sections of dielectric mesh (602) which support polarizer plates (402). The individual mesh sections (602) are suspended between first and second support posts (404, 406) and compression springs (410) may be provided for adjusting and maintaining the tension in the mesh sections (602).

Abstract: A carbon fiber hybrid laminate includes a first group of carbon fiber reinforced laminae having a positive CTE and, second group of carbon fiber reinforced laminae having a negative CTE, wherein the hybrid laminate has a tailorable in-plane CTE in the range of .+-.0.2.times.10.sup.-6 in/in/.degree. F.

Abstract: One aspect of the invention relates to a reflective mat useful to provide an electromagnetically reflective surface on a high-frequency radio antenna. In one version of the invention, the reflective mat includes a conductive mat shaped to conform to a signal receiving surface of an antenna core. The conductive mat has a core contacting surface, which is coated with an adhesive material for joining the conductive mat to the receiving surface, and a signal reflecting surface which is coated with a curable finishing material.

Abstract: An antenna coil, in particular for a contactless smart card, includes coil turns formed of thin conductor tracks having first and second ends. The first end of a respective one of the conductor tracks is electrically conductively connected to the second end of an adjacent one of the conductor tracks. The conductor tracks include first and last conductor tracks, and the first end of the first conductor track and the second end of the last conductor track form coil connections. The conductor tracks are disposed in parallel on a flexible, non-conductive carrier strip. The carrier strip has bends and forms a polygon containing the connected ends of the conductor tracks. The bends are guided through approximately 180.degree., and the coil turns lie approximately in the same plane.

Abstract: A composite antenna and method for constructing same is disclosed. The composite antenna has a grid comprised of electrical conductors woven into the warp of a resin reinforced cloth forming one layer of the multi-layer laminate structure of the antenna.

Abstract: Continuous, elongated nickel plated graphite fibers are bound with an epoxy and are formed into a structural shape (11). An area (13) of the epoxy is removed by bead blasting to expose a layer of the plated graphite fibers (14), which are aligned in the desired direction of radio frequency current propagation. The bead blasted area (13) is then silver plated to obtain good contact to the plated graphite fibers (14) and resultant high conductivity from the structural shape (11).

Abstract: A multi-band, variable, high-frequency antenna comprises a pair of transmission lines for conveyance of signals from and to a transceiver, and a pair of braided copper conductor elements, each in electrical communication at a proximal end thereof with one of the transmission lines. Each of the braided copper conductor elements is mounted on a non-conductive support cord, the braided copper conductor elements being expandable and retractable along the support cords on which the conductor elements are mounted. A cord lock is proximate a distal end of each of the conductor elements for releasably locking the distal end of the conductor element at a selected position on the support cord on which the conductor element is mounted. Release of the cord locks permits lengthening and shortening of the braided copper conductor elements, and locking of the cord locks is operative to lock the conductor elements in place on the support cords to selectively fix a length of each of the conductor elements.

Abstract: Space antenna reflectors comprising composite membranes having a fabric core comprising high modulus fibers, such as of graphite, woven along three or more axes and encapsulated within a cured plastic as a single ply composite material, such reflectors having quasi isotropic strength properties, i.e., the same strength, thermal stability and distortion-resistance in substantially all directions although they are based upon a single, lightweight ply of woven graphite fabric. The present reflectors may have a molded or honeycomb support, for attachment to a spacecraft or satellite.

Abstract: A diamond matrix metallic mesh suppresses RF energy, and particularly side lobe energy, in a phased array antenna, while passing main beam energy. The metal mesh emulates the structure of the bond segments joining the carbon atoms in a diamond structure. The wire diamond lattice structure is placed above an array of radiating elements to absorb side lobe energy. The wire lattice structure is fabricated through use of complementary forms which compress a wire into a required unit shape. Many unit shaped wires are placed in a form which hold the wires in the proper position. Other unit shaped wires are rotated 90 degrees and attached in place to the held wires. Additional unit shaped wires are added to form the basic interlocking cube structure of the diamond lattice.

Abstract: Antenna assemblies and stowage and restraint system thereof, comprising at least one dual band reflector having overall L-band-reflective properties and having a central stiffened Ku-band-reflective area having high reflector surface accuracy surrounded by a flexible annular area having L-band reflective properties. The reflector also has a support hingedly attached to a spacecraft body for deployment between a stowage position in which it is pivoted and restrained up against a face of the spacecraft body and the flexible annular reflector areas partially flexed therearound, and a deployed position in which it is enabled to relax and return to extended, parabolic condition.

Abstract: Continuous, elongated nickel plated graphite fibers are bound with an epoxy and are formed into a structural shape (11). An area (13) of the epoxy is removed by bead blasting to expose a layer of the plated graphite fibers (14), which are aligned in the desired direction of radio frequency current propagation. The bead blasted area (13) is then silver plated to obtain good contact to the plated graphite fibers (14) and resultant high conductivity from the structural shape (11).

Abstract: Films of thermoplastic poly(arylene ether imidazole)s (PAEI)s are used as surface modifiers for neat resin panels and composite resin panels. The PAEI polymer contains imidazole groups along the backbone which co-cure, i.e., react chemically, with epoxies or bismaleimides during processing and thereby provide excellent adhesion between the PAEI film and an epoxy or bismaleimide neat resin or composite resin facesheet. The film provides good adhesion and a smooth surface to the finished part and acts as a release agent from the mold. The as-processed integral structures have very smooth (specular) surfaces, and since the film releases readily from a glass mold, no release agent is necessary. The PAEI film is thermally stable, resistant to electron radiation, and adheres tenaciously to the facesheet. The film maintains good adhesion even after thermal cycling from room temperature to .about. -196.degree. C.

Abstract: An open mesh material for use as a high performance RF reflective antenna surface and which is formed as a Leno type weave using electrically conductive composite yarns which have a construction for avoiding loose metal-to-metal contacts which generate undesirable passive intermodulation products (PIM). The composite yarns are formed by counter-wrapping stretch resistant nonconductive strands about an insulated metal strand and a stretch resistant nonconductive filler yarn. The insulated metal strand preferably includes a beryllium-copper wire which is encapsulated within a polyamide coating. The woven mesh is coated with a RF energy transparent silicone-based paint to provide additional insulation to the plastic coated wires at the weave junctions and has a surface resistivity sufficiently low to facilitate bleed off of building electro-static charges.

Abstract: A method for sewing a plurality of gore-shaped metalized mesh fabric panels to each other to form a parabolic dish-shaped reflector surface for subsequent attachment to the radially extendable rib members of a deployable parabolic reflector. The method includes using a template having "cut" and "sew" lines indicated thereon for cutting out a desired number of gore-shaped panels from a bolt of metalized mesh fabric and sewing the panels together along adjacent side edges thereof to form the dish-shaped reflector surface. The dish-shaped reflector surface is then attached to the reflector by sewing the mesh fabric panels to stitch holes provided in each rib member. The reflector surface is accurized by using a wedge-shaped tool which is placed on a slack reflector panel adjacent a gore seam.

Abstract: An open mesh material for use as a high performance RF reflective antenna surface and which is formed as a Leno type weave using electrically conductive composite yarns which have a construction for avoiding loose metal-to-metal contacts which generate undesirable passive intermodulation products (PIM). The composite yarns are formed by counterwrapping stretch resistant nonconductive strands about an insulated metal strand and a stretch resistant nonconductive filler yarn. The insulated metal strand preferably includes a beryllium-copper wire which is encapsulated within a polyamide coating. The woven mesh is coated with a RF energy transparent silicone-based paint to provide additional insulation to the plastic coated wires at the weave junctions and has a surface resistivity sufficiently low to facilitate bleed off of building electro-static charges.

Abstract: The first embodiment is a 4-wire fractional-winding helical antenna in which a spiral conductor pattern is formed easily and precisely on the surface of a supporting member in the form of a cylindrical tube or a stepped cylindrical tube form by the photoetching technology. This 4-wire fractional-winding helical antenna has improved characteristics, in particular broader frequency bandwidth. Further, it can solve the problems with the winding of the helical conductors. The second embodiment is an antenna unit in which a shield plate is provided between the antenna and coupling and conversion circuits, the antenna-side face of the shield plate is coated with a material for absorbing electromagnetic waves, and the antenna plate comprises an aluminum or copper plate and a layer of ferrite on the antenna-side face of the aluminum or copper plate.

Abstract: A laminated composite shell structure having quasi-isotropic thermal expansion and contraction characteristics and a method for its fabrication. The laminated composite shell structure includes multiple layers of overlapping strips of composite material conforming to an axisymmetric doubly-curved surface. The fibers in the multiple layers are arranged at different relative angular orientations, with the composite strips being shaped to maintain the fibers at a constant relative angular orientation throughout the shell structure.

Abstract: A laminate (10) which is transparent to radio frequency emissions, useful as a thermal control and electrostatic discharge surface, for example for protecting spacecraft antenna hardware, comprises a conductive layer (12) for dissipating electrostatic charges and a thermal control layer (24) for reflecting thermal radiation and reducing the effect of temperature variations on one side of the laminate on the region on the other side of the laminate. In a preferred embodiment, the conductive layer (12) preferably comprises a semiconductor, such as germanium. The thermal control layer (24) comprises a film layer (14), for example of polyimide film, a mesh layer (16), for example of polyamide fabric, attached to the film layer (14), and a thermally reflective coating (20), applied to the mesh layer (16) for aiding the conductive layer (12) and thermal control layer (24) in reflecting radiation.

Abstract: An elongated rod 11 of dielectric material, for example fiberglass--plastic or the like, has a central conductor (12) located coaxially therein, the conductor having a length L=3/2 .lambda.; in the central .lambda./2 range, the insulating rod is surrounded by a conductive layer (13, 16, 20, 25), for example of conductive lacquer, a mesh or braid of conductive material, a conductive foil or tube or the like. In the lower .lambda./2 region of L1, the bottom terminal of the central conductor will provide a high resistance output for the higher one of the frequency ranges which, for example, can be a radio telephone, or vehicular communication frequency of between 450-470 MHz. The entire antenna is suitable as an AM-FM/radio-telephone combination antenna. .lambda. is the median operating wave length of the higher one of the frequency ranges for which the antenna is suitable. Preferably, the antenna is covered with a sleeve of insulating material, for example a heat shrinkable plastic (27).

Abstract: A helical type of antenna has at least one radiating cord, helically wound in a rotational shape. The antenna has a circuit for the supply of the radiating cords formed by a strip line type of transmission line which fulfills both the supply distribution function and the function of matching the radiating cords of the antenna.

Abstract: An arrow incorporating a radio signal transmitting device allows a hunter to find a lost arrow. The arrow includes a hollow aluminum shaft which acts as the primary transmitting antenna. A braded metal cable inside the hollow shaft acts as a secondary antenna when the primary antenna is broken, for whatever reason.

Abstract: The invention is an electromagnetic wave reflector for an antenna and its production method. The wave reflector comprises a rigid curved support provided with a convex front face coated with a heat-insulating paint, a metal fabric suitable for reflecting the electromagnetic waves and covering the paint, hook and loop strip type fixing means secured to the rear face of the support ensuring that the fabric is maintained on the support, and a thermal extra-insulating material situated on the entire rear face of the support, said extra-insulation material being kept in place by adhesive polyimide strips.

Abstract: A panel shaped mesh-type structure is provided as one of the conductive or radiating members of a radio frequency mobile antenna fed by a coaxial cable. The mesh-type structure appears to decouple antenna currents in the coaxial cable at short distances, while maintaining performance as a transmitter at long distances. The radiating elements are surrounded by an insulating material which serves as a dielectric, further improving antenna performance and also serving as environmental protection. The radiating elements are made from readily available mesh and sheet stock materials aligned in a generally planar configuration attached to a either the shield or center lead of the coaxial cable. A small section of the central cable conductor is stripped of insulation and shielding, to serve as a miniature loading coil for the first plate-type conductive element. Shielding of the coaxial cable is attached directly to a mesh-type element serving as the counterpoise.

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 discontinuous panel shaped element forms one of the radiating dipole members of a radio frequency mobile antenna fed by a coaxial cable. The discontinuous element decouples antenna currents in the coaxial cable placed at short to medium distances from the element, while maintaining matched element performance as a long distance transmitter. The radiating elements are surrounded by an insulating material which serves as a dielectric, further improving antenna performance and also serving as environmental protection. The radiating elements are made from readily available sheet stock materials aligned in a generally planar configuration. The discontinuous dipole member is attached to the shield and the other dipole member is connected to the center lead of the coaxial cable. A small section of the central cable conductor is stripped of insulation and shielding, to serve as a miniature loading coil for loading the first plate-type conductive element.

Abstract: A radio-frequency reflective surface is made of a fabric woven from a yarn having an effective coefficient of thermal expansion of substantially zero over a useful temperature range. The yarn comprises a metallic filament around which non-metallic rovings are wound. The coefficients of thermal expansion of the filament and the roving material are related to each other so that mechanical strain thermally induced in the filament by changes in temperature is counteracted by mechanical strain thermally induced in the rovings. Intermodulation products at yarn intersections of the fabric are substantially zero.

Abstract: A primary slotted array antenna operates at 10 GHz. In front of the primary antenna there is disposed a secondary antenna which operates at 1 GHz and is substantially transparent at 10 GHz. The secondary antenna is formed by an array of patch radiators and a transmission line feed network. The radiators and feed network are all formed by a conductive grid sandwiched between dielectric layers and designed to achieve the transparency at 10 GHz. At 1 GHz the grid appears as a continuous conductor forming one conductor of a microstrip transmission line. The other conductor (ground plane) is formed by the conductive front surface of the primary antenna. The grid/dielectric sandwich is suitably spaced from the ground plane by low dielectric pads. Other embodiments use slotline or coplanar stripline techniques. The ground plane may be an integral part of the secondary antenna, also constructed to be transparent at primary frequency.

Abstract: An antenna reflector material for electromagnetic waves is comprised of knitted strands of fine diameter graphite filaments, which have been individually coated with a stress absorbing layer (e.g. a thin metallic or dielectric cladding). Because of the stress absorbing coating, the graphite fibers, which, by themselves, are inherently brittle and unable to tolerate substantial changes to their bend radius profiles, are able to be successfully knitted into a tricot mesh configuration and thereby yield an antenna surface material that possesses a near-zero coefficient of thermal expansion and a sufficiently low in-plane mechanical stiffness. After the tricot knit graphite mesh material has been formed, the cladding layer may be removed (e.g. by heat or chemically dissolved), without affecting the mechanical properties of the graphite strands of the tricot knit.

Abstract: Radio frequency antenna is buried in the earth with its top substantially flush with the surface with a significant portion of the antenna buried therebelow. The antenna is configured so that, if much of the top is removed, as by blast, the remaining portion of the antenna remains operative without significant functional deterioration.

Abstract: Disclosed is an electroconductive fibrous material comprising a composite yarn comprising a core yarn composed of at least one kind of fiber selected from organic fibers and inorganic fibers and a covering layer composed of a ribbon-shaped metal fiber spirally wound around the core yarn, the coverge of the ribbon-shaped metal fiber to the core yarn being at least 50%. The electroconductive fibrous material is used for a parabolic reflecting body of a parabolic antenna and as an electromagnetic were shielding material. A collapsible parbolic antenna is also disclosed which has a collapsible framework comprising a central shaft, a plurality of wing ribs rotatably pivoted on one point of the central shaft, a bracket slidably attached to the central shaft and a plurality of push-up ribs for connecting the wing ribs to the bracket, and a sheet supported by the wing ribs to cover spaces between adjacent wing ribs, which sheet is made of the electroconductive fibrous material.

Abstract: The present invention relates to fiber structures and methods for obtaining tuned response to high frequency electromagnetic radiation, particularly at microwave frequencies. In one embodiment, a woven fabric is prepared with ferrite filled fibers oriented perpendicular to dielectric filled fibers. The fill of the fibers is selected to reflect radiation having a known frequency and polarization. In other embodiments, tuned structures are provided by disposing sheets containing oriented ferrite and dielectric fibers parallel to one another and moving the layers relative to one another to achieve the desired impedance for incident radiation.

Abstract: High magnetic permeability composites are obtained by incorporating ferrite fibers in the composites. The ferrite fibers consist of a polymer and particulate ferrite fill at a concentration above the percolation threshold for the ferrite fill in the polymer (typically greater than 30 volume percent). The aspect ratio and ferrite concentration of the fibers are selected to minimize demagnetization fields in the fibers. The fibers can be dispersed in low concentration in an unoriented fashion in the composites to impart high magnetic permeability to the composite. In other embodiments, the fibers are oriented in the composites to impart high magnetic permeability to the composite for incident radiation of a particular linear polarization.

Abstract: This structure for a dichroic antenna can be used in a reflector antenna capable of operating at the same time at two different frequencies or with two orthogonal polarizations, and presents mechanical characteristics allowing its use on board the satellites. The structure, suitable for a subreflector, comprises a plurality of layers with high mechanical stiffness in the external part, followed by layers with low dielectric constant and one or a plurality of metallic grids in the most internal part, separated by low-dielectric constant layers.

Abstract: A deployable spacecraft borne circular reflector structure comprises a plurality of plies of graphite fiber reinforced epoxy (GFRE) fibers, each ply comprising at least two layers of graphite epoxy reinforced fibers having quasi-isotropic properties. A circular ring of multiple layer plies of like construction as the reflector and having a U-shaped cross-section is bonded to the reflector rear surface adjacent the reflector peripheral edge. Each layer of each structure is formed from prepreg graphite fiber epoxy reinforced material.

Abstract: An improved antenna mesh material is made of gold-plated tungsten wire. Because gold-plated tungsten can be drawn to a very fine diameter (less than one mil) it results in a knit mesh having low mechanical stiffness. It also has high electrical conductivity, thereby enhancing its operation as an antenna reflector up to the higher RF frequencies (EHF). In addition, gold-plated tungsten has both sufficient tensile strength and a low coefficient of thermal expansion which enables it to maintain high reflector surface accuracy for changing thermal conditions.

Abstract: This invention relates to an antenna material and more particularly to an antenna material comprising, in its preferred embodiment, a woven mesh of amorphous silica fibers, a conductive metal coating on at least the outer surfaces of the mesh and a lubricant covering and adhering to non-metallized surfaces of the silica fibers.

Abstract: A cross polarized wire grid antenna is disclosed which produces circularly polarized electromagnetic radiation. A subarray layer of the present invention comprises a plurality of interconnected rectangular elements. The elements are connected and fed so that the short sides of the rectangles serve essentially as radiating elements, and the long sides of the rectangles serve essentially as nonradiating transmission line elements. In an embodiment of the present invention, a first subarray comprises two layers of horizontally polarized radiators and a second subarray comprises two layers of vertically polarized radiators. The two subarrays are combined to form a cross-polarized antenna array which produces circularly polarized electromagnetic radiation. The layers of each subarray are electrically isolated from one another and are displaced 1/2.lambda. with respect to each other perpendicular to the direction of polarization of the subarray.

Abstract: Metallized sheet-form textile materials of synthetic polymers or natural fibres, to which a metal layer has been applied by currentless wet-chemical deposition, are particularly suitable for use as reflectors for electromagnetic waves in the range from 10 MHz to 1000 GHz. In the case of stretched metallized fabrics, the reflecting radiation is partly polarized which can facilitate or improve the recognition of an object by radar beams. By periodically stretching and relaxing the fabric, it is even possible to modulate the reflected microwaves.

Abstract: An electrically conducting, electromagnetic wave reflector comprises a knit wire reflecting surface consisting of two superimposed knitted wire meshes. The wire mesh reflector is impregnated with a transparent thermo-setting resin so that the metallic structure is no more than 3 mils from the outer surface of the reflector. The knitted wire mesh permits the fabric to be smoothly stretched over a three-dimensional surface of predetermined shape. The two wire meshes are staggered with respect to each other to reduce the effective size of the openings between the loops of the mesh. A reinforcing structure preferably consisting of two layers of glass cloth impregnated with a thermo-setting resin is utilized to provide a lightweight reflector substantially impervious to environmental corrosion. The resulting structure may be used as an antenna or reflector and is suitable for the microwave region such as the K band. There is also disclosed a method of constructing such a reflector.

Abstract: A lightweight structural part is formed of band-shaped fiber strands woven into a lattice-type structure. Each fiber strand is made up of a number of carbon fiber rovings impregnated with a synthetic resin. The rovings in each strand are arranged in at least two layers with a plurality of rovings in each layer. The fiber strands are disposed in spaced relation in the lattice-type structure and are woven in a repetitive pattern. In forming a structural part or a support, the lattice-type structure can be cut into sectors or other shapes with the shapes being joined together, if necessary, to provide the desired finished configuration.SUMMARY OF THE INVENTIONThe present invention is directed to a lightweight structural part formed of carbon fiber-reinforced plastic which is constructed from carbon fiber rovings wound on a mandrel and subsequently processed by pressing.Carbon-fiber-reinforced plastics are used for structural parts which must have a high rigidity and a very low specific weight.

Abstract: This invention relates to a deployable antenna or reflector having an offset paraboloid shape. The antenna can be packaged in a small volume. Radial ribs, interconnected by stiffeners, extend from a semicircular support hub. A metalized mesh is stretched between the radial ribs to form a reflective surface.

Abstract: An electrical structure having a wire conductor secured to a supporting substrate is fabricated by stitching the substrate with a sewing machine using a wire as one sewing filament of the machine. The particular electrical structure described is a parabolic antenna having a wire screen reflector consisting of a plurality of wire screen sections or "squares" secured in checkerboard fashion to a supporting frame with the edges of adjacent squares in electrical contact. Each square is fabricated by utilizing the wire stitching technique of the invention to lock stitch a supporting substrate in a grid pattern consisting of the stitched wires disposed in intersecting parallel rows and electrically joined to one another at their intersections to form a screen square.