Abstract: An electronically scanned antenna comprising a travelling wave guiding structure having a bottom conductor and a top conductor developing each along a first direction, the top conductor comprising a plurality of first conductive patches arranged periodically along said first direction and connected in series by tuning circuits; the electronically scanned antenna further comprising a plurality of amplifiers arranged for compensating resistive and radiation losses along the length of the travelling wave guiding structure.

Abstract: A technique is proposed for reducing leakage electromagnetic field that reduces the electromagnetic leakage from a connection point between a communication coupler and a signal transmission apparatus and that can conduct both communication and transmission of electric power. The signal transmission apparatus includes: a first sheet conductive body portion constituting a lower portion electrode; and a second sheet conductive body portion in a mesh shape which is laminated on the first sheet conductive body portion while a gap area is sandwiched therebetween and which includes an uneven mesh size area on which a sheet impedance is continuously changed.

Abstract: A waveguide structure including (i) a base that has a mounting surface, (ii) a metal plate member that has elasticity, that is stacked on the mounting surface, and that functions together with the base to constitute a waveguide, (iii) a positioning mechanism that is constituted by a positioning pin that is disposed so as to protrude from the base and an interfitting portion that is formed on the plate member, and that is fitted together with the positioning pin, the positioning mechanism positioning the plate member on the mounting surface of the base and also restricting movement along the mounting surface by fitting together of the positioning pin and the interfitting portion, and (iv) a holder that holds the plate member in a state of close contact with the mounting surface by pressing the plate member so as to generate a reaction force in the plate member.

Abstract: Provided is a radiator transition assembly for exciting a long slot radiator of an antenna, the transition assembly including a folded flexible circuit substrate including at least two folds forming a long slot radiator, an excitation circuitry configured to generate signals for exciting the long slot radiator, and a microstrip transmission line coupled to the excitation circuitry and positioned along the folded flexible circuit substrate, where the microstrip transmission line extends across an opening of the long slot radiator.

Abstract: A cavity antenna for an electronic device such as a portable computer is provided. The antenna may be formed from a conductive cavity and an antenna probe that serves as an antenna feed. The conductive cavity may have the shape of a folded rectangular cavity. A dielectric support structure may be used in forming the antenna cavity. A fin may protrude from one end of the dielectric support structure. The antenna probe may be formed from conductive structures mounted on the fin. An inverted-F antenna configuration or other antenna configuration may be used in forming the antenna probe. The electronic device may have a housing with conductive walls. When the cavity antenna mounted within an electronic device, a planar rectangular end face of the fin may protrude through a thin rectangular opening in the conductive walls to allow the antenna to operate without being blocked by the housing.

Abstract: A cavity antenna for an electronic device such as a portable computer is provided. The antenna may be formed from a conductive cavity and an antenna probe that serves as an antenna feed. The conductive cavity may have the shape of a folded rectangular cavity. A dielectric support structure may be used in forming the antenna cavity. A fin may protrude from one end of the dielectric support structure. The antenna probe may be formed from conductive structures mounted on the fin. An inverted-F antenna configuration or other antenna configuration may be used in forming the antenna probe. The electronic device may have a housing with conductive walls. When the cavity antenna mounted within an electronic device, a planar rectangular end face of the fin may protrude through a thin rectangular opening in the conductive walls to allow the antenna to operate without being blocked by the housing.

Abstract: A cavity antenna for an electronic device such as a portable computer is provided. The antenna may be formed from a conductive cavity and an antenna probe that serves as an antenna feed. The conductive cavity may have the shape of a folded rectangular cavity. A dielectric support structure may be used in forming the antenna cavity. A fin may protrude from one end of the dielectric support structure. The antenna probe may be formed from conductive structures mounted on the fin. An inverted-F antenna configuration or other antenna configuration may be used in forming the antenna probe. The electronic device may have a housing with conductive walls. When the cavity antenna mounted within an electronic device, a planar rectangular end face of the fin may protrude through a thin rectangular opening in the conductive walls to allow the antenna to operate without being blocked by the housing.

Abstract: An antenna element is disclosed that includes a first antenna portion having a hemispherical shape; and a second antenna portion having a conical shape, and a feeding portion disposed at an apex of the conical shape and configured to be fed with an electrical power from an external power source, wherein the first antenna portion and the second antenna portion are engaged with each other to form the antenna element having a teardrop shape.

Abstract: An antenna core design. An antenna assembly is provided for use in tracking and locating equipment used to track and locate tools with underground drilling systems. The antenna assembly comprises an elongate core, a plurality of metal strips supported on an external surface of the core, an insulating material adapted to insulate each of the plurality of metal strips from the other metal strips and the core, and a wire disposed around the external surface of the strips. Alternatively the antenna assembly comprises an elongate core, an insulating material disposed around a perimeter of the core, and a wire disposed around the insulating material. The core has a plurality of slots cut from one end of the core so that the core defines a plurality of metal strips. A support ring is disposed on the internal surface of the core to support the metal strips.

Abstract: An antenna for radiating and/or receiving signals. The antenna includes (i) a first hollow and helical pipe, (ii) a second hollow and helical pipe, (iii) a first transmission wire, (iv) a second transmission wire, and (v) a dielectric connector. The dielectric connector physically couples to the first hollow and helical pipe and the second hollow and helical pipe. The first hollow and helical pipe and the second hollow and helical pipe comprise an electrically conductive material. The first transmission wire comprises a first portion and a second portion. The second transmission wire comprises a third portion and a fourth portion. The first portion of the first transmission wire and the third portion of the second transmission wire are inside the first hollow and helical pipe.

Abstract: A device for emitting and receiving electromagnetic radiation, in particular microwave radiation, including at least one feed element, at least one hollow conductor and at least one rod radiator, the feed element being situated on a first end of the hollow conductor in such a way that the power emitted by the feed element is passed through the hollow conductor and/or the received power that is passed through the hollow conductor is injected into the feed element and the rod radiator is situated at a second end of the hollow conductor in such a way that the transmit power passed through the hollow conductor is bundled and emitted via the rod radiator and/or the incoming received power is bundled by the rod radiator and conducted into the hollow conductor.

Abstract: An antenna arrangement for a communication device is provided that may include a monopole antenna element having a bottom side joined to a first lateral side and joined to a second lateral side. The bottom side may be joined to each lateral side at an angle less than 90 degrees for forming an antenna element area defined at least by the bottom side and the first and second lateral sides. The antenna element area may include an central part arcuate around a longitudinal axis in a conical fashion, so that at least a part of the bottom side is provided half a turn around the longitudinal axis.

Abstract: An antenna (10) having outer and inner sections (12, 14) of electrically conductive material and coaxial with a longitudinal axis (19). The outer section includes an outer side wall (22) extending from the bottom to join an outer top wall at the top of the antenna. The inner section includes an inner side wall extending upward from the bottom to join an inner top wall. The outer and inner sections define an interior region (32) filled with dielectric material. The outer section has at least one slotted opening (34) with opposed ends, wherein each such slotted opening extends from one end in the outer side wall, across the outer top wall, and to the opposed end in the outer side wall. The inner section including at least one feed (36) to convey electromagnetic energy into or out of said interior region of the antenna.

Abstract: A wide band-width antenna, comprising a copper tube in a main structure, wherein the copper tube is closed at one end and is provided with a screw thread at the other end inside the copper tube so as to be connected with a feed-in terminal.

Abstract: An existing monopole is strengthened to accommodate loading associated with additional elements included in over-the-air communications systems by placing expanding foam and aggregate, light weight aggregate concrete, normal weight aggregate concrete or other types of fill material into the hollow bore in the interior of the monopole. Monopole strengthening may equire base plate strengthening, adding anchor bolts and/or foundation strenghtening. This permits an existing monopole to accommodate more elements than were initially envisioned when the monopole was initially erected.

Abstract: A base station for a cellular telephone system provided with a solar shield formed of conductive material. The solar shield also functions as a ground plane for an antenna mounted to its outer surface.

Abstract: An electric dipole antenna includes a first and a second arm extending along a dipole axis away from a feed gap in substantially opposite directions. A first and a second end body are operatively coupled to opposite ends of the first and the second arms. Each end body has a width dimension which extends perpendicular to the dipole axis. A dipole length dimension extends along the dipole axis through the first and the second arms and the first and the second end bodies. A current conduction circuit provides a radiation field for the electric dipole antenna. The circuit passes along the first and the second arms and around a closed perimeter of the first and the second end bodies. As a result, the electric dipole antenna exhibits a series resonant frequency at a wavelength which is at least eight times the dipole length dimension. In addition, an electric monopole antenna design is used. The monopole is situated over a conducting ground plane which reflects the above-ground plane portion of the antenna.

Abstract: A system and method to monitor the specific location of a person, pet or item of personal property by employing elements that enable the user to pinpoint both the distance and the direction of the person or object being monitored relative to the position of the monitoring or transmission unit (the "source"), comprising a tracking transceiver unit, which tracks and monitors the person or object, and the target transceiver unit, which is worn or affixed to the person or object being monitored. The tracking transceiver unit broadcasts a signal to a target transceiver unit, which, upon receiving the signal, will then broadcast a response signal back to the tracking transceiver unit.

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: An electronic theft detection apparatus for detection of saturable magnetic targets has transmitter and receiver antennas formed of single turn loops of rigid metal pipe. The antennas are rectangular and have a width, in the direction of passage, through the interrogation zone, less than the length of a shopping cart. The transmitter antenna is in the form of a rectangular loop and the receiver antenna is of the same overall size and configuration but is bisected with a conductor to form two balanced loops. The antennas are purely inductive and a series resonant circuit is inductively coupled into the transmitter antenna and a parallel resonant circuit is inductively coupled out of the receiver antenna. Special circuits are also provided for temporarily disabling the apparatus when a related lower harmonic frequency signal decreases in amplitude.

Abstract: Spherical antenna arrangements are disclosed utilizing annular slots in polar regions which are associated with resonant cavities having a TE.sub.01 mode or a TE.sub.11 mode of field distribution. This field distribution within the cavity produces a cosine field distribution around the annular slot which serves via proper cavity excitation to produce nearly hemispherical isotropic radiation characteristics. The resonant cavities may take on the form of a parallel-plate structure or a coaxial cylindrical structure. Circular polarization and hemispherical coverage with uniform gain is characteristic of the antenna when the cavities contain probes placed ninety degrees apart in azimuth at the same radius from center and coupled to the quadrature phase related ports of a signal coupler.

Abstract: A buoyant body having one end of a plurality of elongated electrically conductive spring members affixed thereto with the other end of the spring members attached to a movable member, which is in turn affixed to the body and movable with relation thereto, said movable member being held in a first or stored position and biased by the spring members to a second or erected position wherein the spring members define spaced apart arcuate portions of a sphere and are connected as elements of the antenna.

Abstract: A pager antenna system having two conductive containers which act as radiators and form a dipole antenna is disclosed. A metallic coil constructed of tubular material is positioned between the conductive containers and has a first end electrically connected to one of the containers. The tubular coil forms part of an antenna impedance matching network and also serves as a conduit for wires which interconnect circuit components located in each of the conductive containers. High frequency isolating chokes are connected in series with the interconnecting wires emerging from a second end of the tubular matching coil and prevent these wires from forming low impedance RF paths between the conductive containers. By making the RF impedance matching coil also serve as a conduit for low frequency interconnecting wires, fewer parts are required, the interconnecting wires are shielded from external influences, and low Q chokes can be used by connecting them across points which have a low RF impedance therebetween.