Abstract: A method for operating an electromagnetic compatibility testing system includes for selected frequencies, adjusting incrementally the lengths of each of the plurality of length-adjustable elements for selected combinations of length ratios between the driven element and other length-adjustable elements, including length ratios where the driven element is longer than the other length-adjustable elements, for each selected frequency storing in a table one of the incremental lengths at one of the selected combinations of length ratios having one of the lowest VSWR and a VSWR lower than a threshold value that has highest signal strength, for each selected frequency adjusting the lengths of each of the length-adjustable elements to the stored lengths, driving RF energy at the selected frequency at a EMC test power level into the EMC antenna generating an e-field in the equipment under test, and measuring behavior of the equipment under test in the presence of the e-field.

Abstract: Aspects of the subject disclosure may include, for example, receiving wirelessly a first transmission of data from a network interface device, wherein the network interface device includes a receiver and a transmitter. The network interface device receives, via the receiver, electromagnetic waves that propagate on a surface of a dielectric transmission medium. The network interface device converts, via the receiver, the electromagnetic waves to an electrical signal, and transmits, via the transmitter, a first transmission of the data based on the electrical signal. A determination is made that the data is to be directed towards a recipient device connected to at least one electrical circuit and, based on the determination, a second transmission of the data is initiated as a power line communication transmission of a utility power line via the at least one electrical circuit. Other embodiments are disclosed.

Abstract: Aspects of the subject disclosure may include, for example, a system for generating first electromagnetic waves and directing instances of the first electromagnetic waves to an interface of a transmission medium to induce propagation of second electromagnetic waves substantially having a non-fundamental wave mode. Other embodiments are disclosed.

Abstract: Aspects of the subject disclosure may include, for example, a system for receiving telemetry information from an apparatus that induces electromagnetic waves on a wire surface of a wire of a power grid for delivery of communication signals to a recipient communication device coupled to the power grid, and detecting a condition from the telemetry information that is adverse to a delivery of the communication signals to the recipient communication device. Other embodiments are disclosed.

Abstract: Aspects of the subject disclosure may include, for example, a node device includes an interface configured to receive first signals. A plurality of coupling devices are configured to launch the first signals on a transmission medium as a plurality of first guided electromagnetic waves at corresponding plurality of non-optical carrier frequencies, wherein the plurality of first guided electromagnetic waves are bound to a physical structure of the transmission medium. Other embodiments are disclosed.

Abstract: According to one embodiment, a wireless apparatus includes a first antenna and a second antenna. The first antenna is positioned on a first imaginary plane orthogonal to a rotation axis and includes a first main radiating element. The second antenna is positioned on a second imaginary plane orthogonal to the rotation axis and opposite to the first imaginary plane at a first space from the first imaginary plane and includes a second main radiating element. The second antenna is rotatable around the rotation axis and performs at least one of transmission and reception of electromagnetic wave to and from the first antenna, and at least one of the first main radiating element and the second main radiating element is displaced from the rotation axis.

Abstract: The present disclosure provides systems and methods associated with an antenna system comprising a tension member configured to be towed by an aerial platform and/or secured to an orbiting satellite. In some embodiments, a first end of the tension member may be secured to the aerial platform and the second end may extend unsecured from the aerial platform at a different elevation than the first end. A plurality of antenna assemblies, each comprising at least one antenna, may be secured to and spaced along the length of the tension member. Each of the plurality of antennas may be adapted for use with a particular frequency or frequency bandwidth. For example, each of the plurality of antennas may be adapted or tuned for one or more frequencies useful for synthetic aperture radar (SAR). In some embodiments, a receiving system, a communication link, and/or an antenna location system may be utilized.

Abstract: The present disclosure provides systems and methods associated with an antenna system comprising a tension member configured to be towed by an aerial platform. In some embodiments, a first end of the tension member may be secured to the aerial platform and the second end may extend unsecured from the aerial platform at a different elevation than the first end. A plurality of antenna assemblies, each comprising at least one antenna, may be secured to and spaced along the length of the tension member. Each of the plurality of antennas may be adapted for use with a particular frequency or frequency bandwidth. For example, each of the plurality of antennas may be adapted or tuned for one or more frequencies useful for synthetic aperture radar (SAR). In some embodiments, a receiving system, a communication link, and/or an antenna location system may be utilized.

Abstract: A stabilized field sensor apparatus collects field data, in particular magnetic field data, with reduced motion noise. The apparatus includes a tear drop shaped housing, a tow frame in the housing, a plurality of vibration isolating dampers spaced around the frame, a base assembly mounted to the dampers, a support pedestal having a bottom end fixed to the base assembly and an upper free end, a single spherical air bearing connected to the upper free end of the pedestal, an instrument platform with a lower hollow funnel having an upper inside apex supported on the air bearing for a one point support, principal and secondary gyro stabilizers for maintaining pivotal and rotational stability, and at least one field sensor mounted to the instrument platform for collecting the field data while being stabilized against motion noise including vibration, pivoting and rotation from the base assembly, from the tow frame and from the housing.

Abstract: A mobile terminal device includes a circuit board accommodated in a casing and an antenna disposed on the outside of the casing electrically connected to each other via a opening formed in the casing, a first conductive member fixed to an inner surface of the casing while being connected to the circuit board, a second conductive member detachably attached to an outer surface of the casing while being connected to the antenna, and a conductive fastening member fitted into the opening from outside the casing and fastening the first conductive member and the second conductive member together.

Abstract: The present invention is a double-suspension receiver coil apparatus and system for conducting electromagnetic surveys including, both ground-based and airborne measurements. The present invention includes at least one receiver coil suspended by way of first suspension members within an inner frame and said inner frame being suspended by second suspension members within an inner ring which is further enclosed within an outer frame. The double-suspension receiver coil apparatus functions so as to maintain the receiver coil position while minimizing vibrations in order to achieve a high signal-to-noise ratio and enable accurate measurements. The receiver coil may be in an airborne system in a near-horizontal position or in a ground system in a vertical position.

Abstract: An airborne electromagnetic prospecting system (10) is disclosed. The system (10) comprises a transmitter loop structure (12) hat is attached to, and arranged to be towed by, a helicopter (14). A transmitter (22) is fitted to the transmitter loop structure (12) for transmitting a primary electromagnetic field. A high drag bird (26) is attached to, and arranged to be towed by, the transmitter loop structure (12). A receiver (38) is fitted to the high drag bird (26) for receiving a primary and secondary resulting electromagnetic field, the secondary field arising from the interaction of the primary field with ground conductors that are traversed by the helicopter (14). Significantly, the high drag bird (26) is also attached to, and arranged to be towed by, the helicopter (14), so as to keep the position of the receiver (38) relative to the transmitter (22) substantially constant.

Abstract: The present invention provides apparatus and an associated method for remotely energizing power storage devices. Energization may preferably be effected through the use of RF energy within frequencies of the wireless fidelity standards. The remote station preferably has at least one antenna having an effective area greater than its physical area. The invention may advantageously be used on wireless fidelity products which are energized by the power storage device.

Abstract: An airborne time domain electromagnetic surveying system is provided. The system includes a tow assembly with a flexible support frame. The flexible support frame spaced apart from the aircraft includes a transmitter section with a transmitter loop and a receiver section with a sensor aligned with the central axis of the transmitter section. The flexible support frame has a lightweight modular structure that enables the surface area of the transmitter section to be increased and decreased to suit particular survey applications. The transmitter loop sends a pulse in an “ON” interval, and in an “OFF” interval the sensor measures the earth response to the pulse. The tow assembly also includes a sensor for generating selected survey data in the “ON” interval. A transmitter driver enables the creation of earthbound pulse. The system components are linked to a computer and control computer program linked thereto for controlling the functions thereof.

Abstract: A broad-band antenna includes in a common plane tow symmetrical parts (2,3) each including at least two interconnected conductor strands (4,5,7,8;19,20,21) powered by a double-wire line (10;22), each strand including in its portion opposite the double-wire line, a resistive load (11,12,14,15;23,24,25,26).

Abstract: A wire antenna having a Vivaldi taper that is used to radiate or receive low frequency RF energy from or to an airborne platform. The antenna comprises two conducting wires that trail from the platform, and which comprise a radiator having a Vivaldi taper. The shape of the conducting wires is maintained by a combination of aerodynamic drag on the conducting wires, a weight connected to the end of the lower wire, a chute connected to the end of the upper wire, and nonconducting guy-wires connecting the upper and lower conducting wires. The nonconducting guy-wires are positioned at locations between the upper and lower conducting wires to form and maintain an optimal taper between the conducting wires. A method of deploying a Vivaldi antenna from an airborne platform is also disclosed. A lower conducting wire is attached to the enclosure, and an upper conducting wire is attached to a chute. The antenna and chute are stored in the enclosure, and the enclosure is disposed beneath the platform.

Abstract: A sphere and cable deployer apparatus for deploying a cable and associated spheres from a vehicle such as a spinning satellite. The sphere and cable deployer apparatus has a drum for storing the cable that is driven by a drive shaft and gears form a drive motor to deploy the cable and sphere away from the satellite. The drive motor also drives a drive roller through a series of gears and clutch that applies tension to the cable as it is being unwound from the drum. The sphere and cable deployer apparatus also has a housing with an outer and inner pair of shell-like halves that pivot outward due to spring forces to release the spheres. Each pair of pivoting housing halves also provide a storage compartment for a short cable portion that is attached to that sphere.

Abstract: A sphere and cable deployer apparatus for deploying a cable and associated sphere from a vehicle such as a satellite. The sphere and cable deployer apparatus has a drum for storing the cable that is driven by a drive shaft and gears form a drive motor to deploy the cable/sphere away. The drive motor also drives a drive roller through a series of gears and clutches that applies tension to the cable as it is being unwound from the drum. The sphere and cable deployer apparatus also has a sphere housing with two shell-like halves that pivot outward due to spring forces to release the sphere. The pivoting housing halves also provide a storage compartment for a short cable that is attached to the outer surface of the sphere. The pivoting housing halves are held in place by two cables that are under tension and associated pins that fit in holes in the housing halves and are released by cable cutters that cut the cables.

Abstract: A broadband omnidirectional antenna has a monopole element driven by an rf source at one end and a load at its other end consisting of insulated parallel conductors tuned to different resonant frequencies. The parallel conductors are equidistantly spaced so that transmission line coupling occurs between adjacent conductors. The parallel conductors progressively decrease in length the further away each conductor is supported from the driven element. The antenna elements can be fabricated from attached insulated wires or ribbon cable and thus the antenna can have low weight, little bulk and great flexibility.

Abstract: Disclosed is an arrangement of two conical radiators that electromagnetically interact with one another to produce circularly polarized radiation in a surface wave transmission system. One of the radiators includes an annular conductive region that coaxially surrounds the surface wave transmission line with a pair of spiral antenna arms extending outwardly along the conical surface of the radiator from oppositely disposed positions on the outer boundary of the annular conductive region. The second radiator, which is spaced apart from the first radiator, includes a circular conductive region to which the end of the surface wave transmission line is joined and further includes a pair of spiral antenna arms that extend outwardly along the surface of the second conical radiator.

Abstract: Disclosed is a conically shaped reflector for producing dual polarized electromagnetic radiation in a surface wave transmission system. The reflector includes a circular conductive region that covers the apex of the conical reflector with the surface wave transmission line being joined to the center of the circular conductive region. Extending outwardly from equally spaced apart positions along the circumference of the circular conductive region are four conductive log-periodic arms.

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: In a system for launching RF energy as a traveling surface wave onto a single wire transmission line and causing such energy to be radiated away from the line at a downstream location, a series of window radiators of annular shape are spaced along the line, coaxial therewith, each for radiating a portion of the surface wave energy. Each radiator has a conductive component that causes decoupling and radiation of a portion of the RF energy, and a dielectric window that allows the remaining portion of RF energy to pass therethrough and continue, as an attached surface wave, downstream to a succeeding, similarly formed radiator where the decoupling and partial radiation occurs again. Thus, from the same surface wave transmission line system, it is possible to radiate RF energy from two or more discrete locations along the line.

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: An antenna, suitable for being deployed from an aircraft or other vehicle and characterized by broadband, omnidirectional radiation/reception is provided by a coaxial transmission feed line that is terminated by an electrically conductive ball that is electrically and mechanically connected to an extension of the center conductor of the coaxial line, and by a telescopically adjustable sleeve choke having the end adjacent the ball conductor, electrically bonded to the outer conductor of the coaxial line. The choke is adjusted in length to form a matched counterpoise to the ball radiator.

Abstract: A trailing wire antenna coupling and control method for providing maximum voltage limited power output from power amplifiers of a high power low frequency RF transmitter system while varying the inductance of the coupling circuit to present a high resistance load having practically zero reactance to the power amplifiers, all during extension and retraction of the antenna toward and from its optimum length, as well as at the optimum length.

Abstract: 1. Apparatus for long-range transmissions of messages by means of electromagnetic waves, comprising a long-wave transmitting plant including a message-storing unit, a transmitter, an antenna whose length equals a quarter length of the emitted waves or a multiple thereof, and a missile for hoisting said antenna, a parachute detachably connected to said missile, an elastic cord, said parachute being connected to said antenna by means of said elastic cord, said elastic cord being dimensioned in accordance with the required antenna dimensions and transmission time.

Abstract: An airborne time domain electromagnetic surveying system is provided. The system includes a tow assembly with a flexible support frame. The flexible support frame spaced apart from the aircraft includes a transmitter section with a transmitter loop and a receiver section with a sensor aligned with the central axis of the transmitter section. The flexible support frame has a lightweight modular structure that enables the surface area of the transmitter section to be increased and decreased to suit particular survey applications. The transmitter loop sends a pulse in an “ON” interval, and in an “OFF” interval the sensor measures the earth response to the pulse. The tow assembly also includes a sensor for generating selected survey data in the “ON” interval. A transmitter driver enables the creation of earthbound pulse. The system components are linked to a computer and control computer program linked thereto for controlling the functions thereof.