Abstract: Tethered Unmanned Aircraft Antenna utilizing a Vertical Take Off and Landing (VTOL) Unmanned Aerial System (UAS) which may be provided by quadcopter drone (for example) constrained by a tether connected at one end to a maritime or land-based platform, the tether also being used as a RF antenna. The tether is capable of transmitting DC power to the UAS or drone at a desired antenna height and simultaneously supports RF transmission power with the help of a DC power isolation circuit. The tether is desirously lightweight and corona resistant.

Abstract: A playset comprises a near field communication extending system. The near field communication extending comprises a main antenna and a plurality of extending antennas. The main antenna is positioned at a first location of the playset and configured to wirelessly communicate to a near field communication device of a mobile device. The plurality of extending antennas is positioned at a plurality of different locations in an interior of the playset. Each of the plurality of extending antennas is connectable to the main antenna via a plurality of connection elements. The playset further comprises an antenna switching mechanism coupled to the plurality of extending antennas via a plurality of connection elements. The antenna switching mechanism is configured to switchably couple the main antenna with each of the plurality of extending antennas.

Abstract: A transportable directional antenna system includes an antenna pedestal, a plurality of outriggers, and an earth anchor. The earth anchor can be coupled to a horizontally centered point on the pedestal. Tension can be applied between the earth anchor and the pedestal to substantially preload the outriggers and the surface on which they bear to provide a highly stable antenna.

Abstract: Disclosed is an apparatus and methodology for providing an RFID device for integration into a tire. A printed circuit board (PCB) is provided with notches in opposed ends of the PCB that are provided with guide portions as a part of the notches that function as threads to guide an end portion of a matching single pitch helical antenna into appropriately placed vias on the PCB. Threading of the helical antenna is assisted by use of an assembly jig having antenna guiding channels and PCB retaining positioning elements.

Abstract: A satellite dish is mounted on a bracket which in turn is mounted over an uneven surface of a roof or a wall of a house. The bracket has an elevated bridge portion for supporting a mounting foot of the satellite dish. The bridge portion is integrally connected to and supported by two narrow leg portions which in turn are integrally connected to and supported by two narrow foot portions. The bridge portion is elevated from two foot portions by the leg portions in order to clear the uneven surface of the roof or wall of the house.

Abstract: A structure comprises a first component subject to loading and connected to a second component via a load transmitting member so that the loading exerted by the first component is imposed on the second component. The first component includes a surface secured to a complementary first surface of said load transmitting member and the second component includes a surface secured to a complementary second surface of said load transmitting member. The load transmitting member and the second component are formed of materials having relatively superior and inferior mechanical properties, respectively and the area of said surface of the second component is greater than the area of said surface of the first component. The first component may be an antenna and the second component a radome for a submarine formed of, for example, syntactic foam. The load transmitting member may be formed from fibre-reinforced plastics material.

Abstract: The aerostat-supported antenna/tether cable of a communication system is protected from destructive corona discharges by a dual corona ring assembly which attaches the feed cable of the transmitter to the antenna. The voltage divider assembly includes upper and lower corona rings which have a space between them which is an isolated and corona-free attachment point for the feed cable. By attaching the voltage divider assembly to the antenna/tether cable at about 12 to 15 feet above the ground, the base of the antenna/tether cable distributes the feed voltage along its length to levels below those voltage levels in which destructive ionization may occur.

Abstract: A roof mount for securely attaching dish antennae to roofs of houses typically supported by a plurality of spaced rafters has a two piece frame attached to a selected portion of a roof with one piece on top of the roof supporting the dish and its adjusting mechanism and the other piece of the frame underlying the first frame beneath the roof. A plurality of fasteners penetrate the roof and both frames and draw the frames toward each other to clamp them about the selected portion of the roof and provide steady support for the antenna.

Abstract: A hinged butt joint for connecting struts to multijoint fittings used in space structures is disclosed as two end fittings pivoted together, one of which is bifurcated and the other having a cammed butt end extending between the bifurcation with a pivot pin through aligned openings so that the fittings are rotatable to a desired angular position. Nominal manufacturing tolerances are used throughout. A wedge is forcibly fitted into the base of the bifurcation when the fittings are colinear, and bonded to the base in that position during manufacture or assembly, to preclude freeplay in the joint under alternating compression and tension leads and to create a solid mechanical path though which load is transmitted and heat and electricity conducted.

Abstract: Attenuating apparatus is provided for reducing disturbance between transmitting and receiving aerials mounted vertically one above the other. Attenuation is achieved by a grounded screen (1) and a spacer, both mounted between the aerials. The screen is provided with cutouts (6) having a pitch (c) of .lambda./2, where .lambda. is the mean frequency of the pertinent frequency band and .lambda./4 is the depth (d) of the cutouts. The length of the spacer is 0.70.lambda..

Abstract: A broadband RF isolator system for connection between RF devices such as inear antennas is disclosed. In accordance with this invention, two or more antennas are spaced several wavelengths apart, connected to coaxial feeds and choked at their adjacent ends to establish the electrical length. In one embodiment of the invention, the isolator is formed by placing a second line adjacent the coaxial line connected to the upper antenna. The addition of this second line forms a balanced transmission line having a given characteristic impedance. The second line is terminated at one end by a resistor having a resistance equal to the value of the characteristic impedance. In a second embodiment the second line is replaced by a coaxial sleeve which is also terminated at one end with a resistor having a resistance value equal to the characteristic impedance. In four additional embodiments, which are essentially variations of the second basic embodiment, coaxial sleeves are also utilized to form the isolation system.

Abstract: An end supported antenna having inner and outer elements extending outwardly from a supported end and of which the inner and outer elements each form one element of the dipole. Such antennas are driven centrally of the inner and outer ends or intermediate the ends between the dipoles. There is a decoupling sleeve on the inner element that functions as a coaxial transmission line of variable characteristic impedance on its inside and functions as a radiating element of the antenna on its outside. Generally, one or two sleeves are employed, the sleeves being of non-uniform cross section so as to be either conical or generally conical in shape, flaring from the supported end. A dielectric member separates the inner and outer elements and has an impedance matching network formed therewith. A support pipe extends outwardly from its supporting end to adjacent the impedance matching network.

Abstract: A multiple antenna system for a ship mast top with the individual antenna sections being in stacked relationship. The uppermost antenna is a Global Positioning System antenna. The intermediary antenna is a Tactical Air Navigation antenna. The lowermost antenna is a Joint Tactical Information Distribution System antenna. Isolation between antennas is provided in the form of decoupling chokes which permit the individual systems to run freely.

Abstract: A circularly polarized broadcast antenna includes a vertical mast and a plurality of bays spaced along the mast. Each bay includes at least one crossed dipole fed in quadrature mounted adjacent the mast. Each bay also includes a sleeve which may be .lambda./2 long disposed about the mast to act as a choke to prevent induced current flow on the mast. Current flow in the sleeve creates a vertically-polarized field component which perturbs the directly radiated field and increases the axial ratio. A polarizer is mounted orthogonal to the mast, and the currents induced in the polarizer are orthogonal to and in phase quadrature with the reradiated field of the sleeve to improve the axial ratio.

Abstract: A flat slip ring which is larger in diameter than a conventional slip ring/brush assembly is attached to the rotatable unit concentric with and facing axially with respect to the shaft to carry the conventional slip ring/brush assembly. A circular brush is mounted on the housing of the slip ring/brush assembly concentric with the shaft and facing the flat slip ring. An electrically conductive spring urges the circular brush into contact with the flat slip ring and provides a low impedance ground from the rotatable unit to the housing of the slip ring/brush assembly.

Abstract: This disclosure deals with a three-element unit array (or stacked groups of the same) that enables the use of very large length-to-diameter dipole elements to cover broad frequency bands, greater than 2:1 in frequency ratio, by novel feed structures exciting the element gaps.

Abstract: A feed device is tuned to resonance at a selected frequency, to provide essentially infinite impedance between, for example, a system being fed and the power source. The feed device allows passage of feedline currents, which are equal in magnitude and opposite in phase, but prevents passage of any other, unbalanced currents, e.g., common mode currents, antenna radiation currents, etc. This is due to the fact that the infinite impedance of the feed device defines extremely high attenuation to currents other than feedline currents, at the selected frequency. Thus the resonant feed device acts as an isolating circuit for transmitting and receiving antenna systems and the like, since any unbalance in the antenna elements is isolated from the feedlines, and vice versa, whereby the antenna is truly ground and/or feedline independent.

Abstract: A dished reflector is illuminated by a primary radiation feed including a rectangular waveguide and a secondary radiation feed comprising two dipoles flanking that waveguide. In order to minimize distortion of the radiation diagram from the secondary feed by the waveguide envelope, at least one elongate corrective member paralleling the dipoles is externally mounted on that envelope and is capacitively coupled or conductively connected thereto at a location where a peripheral current induced by the dipoles is at a maximum. The corrective member, like the dipoles themselves, may be a plate with major faces lying in planes perpendicular to the waveguide axis.

Abstract: A method for decreasing radiation from a guy wire located in a strong electromagnetic field is disclosed. The method comprises placing inductive impedances at regular intervals along a guy wire, each interval being less than a half wavelength long. Each inductive impedance is made greater than Z.sub.o but usually less than 5 Z.sub.o where Z.sub.o is the characteristic impedance of the span between inductances. It is shown that induced current distribution in a span between inductances has, say, a negative current in the central portion of the span and positive currents near the two ends of the span. It is this reversal of the direction of the induced current, together with low magnitude, that results in very low re-radiation. In practice the inductive impedances may be constructed by using coils in shunt with guy insulators. In some applications the inductive impedances may take a different form, for example, inductive sleeves or just coils may be used as inductances.

Abstract: A method for decreasing radiation from a guy wire located in a strong electromagnetic field is disclosed. The method comprises placing inductive impedances at regular intervals along a guy wire, each interval being less than a half wavelength long. Each inductive impedance is made greater than Z.sub.o but usually less than 5 Z.sub.o where Z.sub.o is the characteristic impedance of the span between inductances. It is shown that induced current distribution in a span between inductances has, say, a negative current in the central portion of the span and positive currents near the two ends of the span. It is this reversal of the direction of the induced current, together with low magnitude, that results in very low re-radiation. In practice the inductive impedances may be constructed by using coils in shunt with guy insulators. In some applications the inductive impedances may take a different form, for example, inductive sleeves or just coils may be used as inductances.

Abstract: A method and apparatus for controlling reradiation from conductors, such as guy wires, by controlling the current distribution on the conductors, is provided. The invention comprises a cylindrical annular shaped sleeve that is positioned at predetermined distances along an electrically conducting structure to eliminate the reradiation caused by electromagnetic waves. The sleeve is made of a high magnetic permeability material, and a plurality of sleeves is positioned at predetermined spaced-apart distances along the conductor. The predetermined positioning of the sleeve renders the conductor electrically equivalent to a plurality of discrete cable lengths separated by insulators.

Abstract: A unitary broadband high impedance isolation section for a plurality of cely spaced antennas as well as other electrical apparatus wherein the respective separate coaxial cables feeding the antennas and the shielded multi conductor cable for the other electrical apparatus are wound in the same direction on a common core and have the same number of turns, with the shields or outer conductors of all the cables being respectively connected together at the beginning and the end of the windings. The multiport cable choke thus configured can be provided with respective connectors at each end of the choke for facilitating ease of installation into the electrical system, that is, a single multiport cable choke can be inserted in the feed lines of multiple antennas and other electrical equipment simply by means of making suitable interconnections by way of the connectors on both sides of the multiport cable choke assembly.

Abstract: A method and preferred apparatus for introducing radio frequency isolation near the base of a conductive tower to prevent significant flow of RF current into the ground, thereby to produce an elevated vertical antenna. The invention further relates to a method and apparatus for introducing RF power into the upper portion of the isolated tower to cause said portion to radiate or receive at desired frequencies. Isolation and "excitation" are accomplished by the placement of tuned shortened quarter wave conductive sections along selected portions of the tower, the quarter wave sections used for antenna excitation being also used for impedance transformation to match a coaxial transmission line of nominal inmpedance.

Abstract: This disclosure deals with a three-element unit array (or stacked groups of the same) that enables the use of very large length-to-diameter dipole elements to cover broad frequency bands, greater than 2:1 in frequency ratio, by novel feed structures exciting the element gaps.

Abstract: A very thin antenna assembly consisting of three electric microstrip ante systems arrayed on a single dielectric substrate over a ground plane and tuned to three different frequency bands. The low physical profile of the antennas and the assembly hollow conformal arraying capability about an aircraft body without disrupting the aerodynamics of the vehicle. A phase difference of 90.degree. between two elements of the UHF antenna system is used to obtain a wider bandwidth with good matching and also improves the radiation patterns of the array. Button type tuning capacitors in each of the elements of the UHF array permits compensation for variations in the center frequency of the UHF antenna system that are caused by the variation in the substrate dielectric constant, fabrication processes, etc.

Abstract: The drive coupling for an antenna having a shorting assembly traveling along a helix to tune the antenna includes a metal rotating drive shaft extending concentrically through the shorting assembly with flutes on the drive shaft in the region of the helix. A metal shielding cylinder is disposed coaxial to and spaced from the outer surface of the drive shaft and provides an outer member of the shorting assembly. A drive bearing of dielectric material is disposed to engage the flutes and the shielding cylinder so that rotation of the drive shaft rotates the shielding cylinder to cause the shielding assembly to travel along the helix. A guide bearing of dielectric material is disposed to engage the shielding cylinder and the end of the drive shaft remote from the flutes.

Abstract: The structure includes a tunable high power MF/HF transmitting antenna having a vertical axis and a shorting assembly driven along the vertical axis to tune the high power antenna. A hollow rotating drive shaft is disposed coaxially of the vertical axis within and coupled to the shorting assembly to drive the shorting assembly. A plurality of additional antennas are disposed in a vertical stacked arrangment above the high power antenna. A plurality of service conductors each coupled to a different one of the plurality of additional antennas are enclosed in a conduit disposed coaxially of the vertical axis and within the drive shaft. A tunable ferrite isolator is disposed below the drive shaft and includes the conduit to enable the conduit and the service conductors to pass through the high power antenna with a minimum of modification to the performance of the high power antenna.

Abstract: A wall lead-through structure for live feeders, particularly for use in antenna matching systems. The feeder is led through a wall opening which is covered on its outer side by an insulating mounting fixture which provides a centrally located opening for the feeder lead-through. The surface defining the wall opening is covered with a sheet metal lining, preferably sheet copper which serves as a corona protector, and a metallic corona protector encloses and is secured to the live feeder where it passes through the central opening in the insulating mounting fixture.

Abstract: In combination with a plastic fuze radome, a structure for protecting the ternal electronic components housed within said radomes during flight, said structure being a strap-on metal cap designed to slip on or over the ogive of the radome of a fuze. This metal cap is a metal cone having two open windows. The antenna of the fuze electronics is permitted to radiate through the windows while being protected from rain damage by the large umbrella at the top over the plastic nose cone, and from heat flux into electronic components by the large metal band at the bottom. Mechanical ablation of the tip is prevented by the cone of metal acting as a heat sink and as a shield against the wind-stream stagnation pressure. Triboelectric charging is prevented by two conductive straps down the side of the structure, and by a grounding electrical connection.

Abstract: A broadband isolation section comprised of a plurality of series connected able chokes having respective damping resistors shunted thereacross located between at least two dipole antennas mounted one above the other in a generally vertical plane. The isolator section is particularly adapted to be utilized with dipole antennas having respective pairs of radiating elements substantially aligned in a common vertical axis and being fed from respective radio signal sources by feedlines directed along the common vertical axis through the various radiating elements. The cable chokes included in the isolator section are formed from coaxial cable feedlines and the respective damping resistors shunted thereacross are connected to the sleeve or outer conductor of the feedline(s) feeding the upper antenna(s). Thus adjacent antennas have intermediate broadband isolator sections separating them.

Abstract: Protection against the Corona effect is obtained, at the junction between a conductor cable and an insulating cable, by means of loops at an acute angle with the insulating cable, these loops being made of conductor elements clamped in the fixing means, and at least one of the loops being formed by the conductor cable itself.