Abstract: A plane patch antenna has a dielectric substrate formed by calcining ceramic powder press-molded in a desired shape. On one surface of the dielectric substrate, a concave groove is continuously formed along the inside of its outer edge, and on an entire surface within a region partitioned by this concave groove, a patch electrode is thick-film printed.

Abstract: To provide an antenna element having a radiation electrode formed mainly on one surface of a dielectric substrate. The radiation electrode is substantially symmetric in form with respect to the center thereof, and has a first half and a second half with the same direction of main polarization of radiation emitted therefrom. Each of the halves of the radiation electrode may be a quarter-wave antenna for a wavelength of the emitted radiation. A power supply conductor to be connected to a high frequency signal source is connected to the first half of the radiation electrode, and a ground conductor to be connected to a ground is connected to the second half. A total impedance of the first half of the radiation electrode and the power supply conductor and a total impedance of the second half of the radiation electrode and the ground conductor can substantially match to one another, so that resonance between the halves of the radiation electrode can be enhanced and a wider bandwidth can be realized.

Abstract: A folded microstrip antenna for a flight aggregate or aircraft can be arranged around edges of thin structural parts, such as wings, tail units or control flaps, such that its surface is identical with the structure and folding takes place at the edge of the structure. The antenna is constructed such that its characteristic impedance is much higher at the folding edge than at ends of the structural antenna away from the edge. As a result, an approximately omnidirectional characteristic can be achieved.

Abstract: An antenna for receiving satellite signals and terrestrial signals comprises a monopole having a first end, which is connected to a feeding point, and a second end, and an unfed dipole which is arranged in spaced relationship with the second end of the monopole and in axial alignment with said monopole. By means of this arrangement a maximum antenna gain lying at an elevation angle of approx. 45° is achieved. An antenna modification device comprises a dipole and a connection element by means of which the dipole can be connected to the end of an existing monopole antenna in such a way that the dipole is unfed and arranged in spaced relationship with the second end of the monopole as well as in axial alignment with the monopole.

Abstract: A ring-shaped depressed groove 11 is formed between a joining surface 10 of a stem insulating material 6 with a tubular metal container 16 and a joining surface 9 with cathode leads 2a and 2b. A metallized layer 8, formed at joining surface 9 and joining surface 10, is separated from edges 12 and 13 of ring-shaped depressed groove 11. The resulting magnetron reliably prevents discharges generated between the joining surface of the stem insulating material, with the tubular metal container, and the joining surface, with the cathode leads.

Abstract: An antenna system adapted to be mounted on an exterior surface of a mobile platform and having a reduced overall height to reduce aerodynamic drag caused by the antenna system. The antenna system includes a movable platform disposed concentrically within an annular stationary platform. The movable platform includes a slip ring assembly formed on its lower surface which is in physical contact with a brush assembly supported from a lower surface of the stationary platform. By locating the slip ring assembly and the brush assembly adjacent the lower surface of the movable platform, the overall height of the antenna is reduced. Reliability is also improved since contaminants are less likely to accumulate on the slip ring assembly due to its presence on the lower surface of the movable platform.

Abstract: A null direction control method allows optimum antenna weights forming designated null beam directions without calculating an inverse matrix. In an N-element array antenna, a designated null beam antenna pattern is obtained by processing a 2-element antenna weight vector forming a null in a sequentially selected one of M designated null directions and a (N−M)-element antenna weight vector forming a beam in a designated beam direction to produce an antenna weight vector for the N-element array antenna. The final antenna weight vector is calculated by incrementing the number of elements of a work antenna weight vector each time a null is formed in a sequentially selected one of the M designated null directions.

Abstract: An antenna includes a feed generating a communication signal. A sub-reflector is positioned to reflect the communication's signal to form a sub-reflective signal. A main reflector is positioned to reflect the sub-reflective signal. The sub-reflector has an elliptical rim.

Abstract: An antenna arrangement comprises a patch conductor (102) having a feed conductor (106) connected to a first point and a grounding conductor (108) connected between a second point and a ground plane (104). An example of such an arrangement is a conventional planar inverted-F antenna. A problem with such antennas is that their impedance is inductive, making them difficult to feed. The present invention incorporates a slot (702) in the patch conductor (102) between the first and second points, which enables the inductive component of the antenna's impedance to be substantially reduced. Suitable positioning of the slot (702) on the patch conductor (102) also enables an impedance transformation to be achieved. The antenna described above may have a substantially reduced volume compared with known planar antennas with minimal reduction in performance.

Abstract: A present embodiment of the invention solves the problem by providing an antenna control system in a wireless communication system. A communication interface transfers a control signal to an antenna controller. The antenna controller processes the control signal. The antenna controller then substitutes an antenna with another antenna based on the control signal. Advantages of the embodiments include providing a reliable wireless communication system that decreases the number of lost calls by increasing the availability of antennas. Other advantages include providing flexible antenna coverage to an area by remotely controlling the antenna through a public communication network by means of a modem.

Abstract: A radiator includes a waveguide having an aperture and a patch antenna disposed in the aperture. In one embodiment, an antenna includes an array of waveguide antenna elements, each element having a cavity, and an array of patch antenna elements including an upper patch element and a lower patch element disposed in the cavity.

Abstract: A distributed antenna device includes a plurality of transmit antenna elements, a plurality of receive antenna elements and a plurality of amplifiers. One of the amplifiers is a power amplifier operatively coupled with each of the transmit antenna elements and mounted closely adjacent to the associated transmit antenna element, such that no appreciable power loss occurs between the power amplifier and the associated antenna element. At least one of the amplifiers is a low noise amplifier and is built into the distributed antenna device for receiving and amplifying signals from at least one of the receive antenna elements. Each power amplifier is a relatively low power, relatively low cost per watt linear amplifier chip.

Abstract: An ultra-wideband magnetic antenna includes a planar conductor having a first and a second slot about an axis. The slots are substantially leaf-shaped having a varying width along the axis. The slots are interconnected along the axis. A cross polarized antenna system is comprised of an ultra-wideband magnetic antenna and an ultra-wideband dipole antenna. The magnetic antenna and the dipole antenna are positioned substantially close to each other and they create a cross polarized field pattern. The present invention provides isolation between a transmitter and a receiver in an ultra-wideband system. Additionally, the present invention allows isolation among radiating elements in an array antenna system.

Abstract: A label for identifying an object includes a radio frequency transponder and a hologram. The radio frequency transponder has an antenna and a transponder circuit sandwiched between two layers of material which form exterior surfaces of the transponder. The hologram comprises a first layer of non-metallic material applied to one of the exterior surfaces and forming a non-metallic reflector of light. A generally transparent second layer contains a holographic image and extends across the first layer. Because the reflective first layer is made of a non-metallic material, its close proximity to the radio frequency transponder does not detune the transponder as may occur when metallic holograms are placed in close proximity to the transponder. Thus the hologram provides a deterrent to unauthorized use of the label without affecting the operation of the radio frequency transponder.

Abstract: According to the invention, a multi-beam radar sensor for microwaves is proposed, in which between a lens and the transmitter/receiver elements (6), focusing bodies (1) are disposed in such a way that they prefocus the radiation of an applicable transmitter/receiver element (6) with respect to the dielectric lens (8). The focusing bodies (1) are retained by a dielectric plate (2), into which a mount (4) is inserted. The mount (4) is embodied with regard to its material and geometric dimensions such that the least possible coupling between the individual focusing bodies (1) occurs. To attain this object, the mount (4) is embodied by recesses (5) in the regions between the focusing bodies (1). For simpler assembly and adjustment, bores (3) and adjustment openings (10) are provided.

Abstract: An apparatus for reducing earth station interference in a receiver antenna from non-GSO and terrestrial sources is disclosed. The apparatus comprises an absorber coupled to a receiver antenna feed assembly disposed between the non-GSO or terrestrial source and the feed assembly. Embodiments are disclosed in which the absorber is strategically placed where it minimally affects the receiver antenna mainlobe performance, while reducing interference from non-GSO and terrestrial sources.

Abstract: The invention relates to an antenna device comprising a group antenna (310) with radiating elements (340-347) in M rows and N columns M, where N<M, which group antenna (310) has a width measurement (b) and a height measurement (h). The group antenna (310) is so arranged in the antenna device that the projection (P) of the group antenna in the sideways direction of the antenna in the horizontal plane (210) exceeds the width measurement (b) of the group antenna, whereby the group antenna is given a narrower main lobe in the horizontal plane (210).

Abstract: An antenna having a reversibly retained torque wrench. The torque wrench has a deformable lip region of the upper portion of its hollow inner region that allows the torque wrench to be reversibly retained, or coupled, within a wrench coupling region of the antenna during shipping and uncoupled after installation. The torque wrench also is capable of assisting in installing the antenna on its intended base structure by coupling a lower portion of its hollow inner region over a multi-sided torquing region of the lower attachment portion of the antenna and twisting its outer region to tighten the antenna onto its base structure.

Abstract: An embodiment of a dual port antenna system includes a balanced 90° hybrid coupler integrated with a crossed-field antenna to provide stable high isolation between the two input ports of the system. Unlike conventional antennas, the crossed-field antenna is made up of two radiating elements separately fed at a phase difference of 90°. This allows all of the power from the two transmitters to be coupled to the antenna via the hybrid coupler. A balanced 90° hybrid coupler provides isolation between the two ports of the system by matching the electrical characteristics of the antenna. The isolation between ports provided by the balanced 90° hybrid coupler is approximately 35-40 db which is sufficient to allow the independent operation of transceivers connected to the input ports. The crossed-field antenna exhibits loose electrical coupling so that the electrical characteristics remain stable and sufficiently high isolation between input ports is maintained.

Abstract: A signal sensing module senses an RF signal and produces one or more secondary signals representative of the RF signal. An impedance matching control module generates a control signal, based on the one or more secondary signals, which is indicative of an impedance mismatch between a load and a communications device. The control signal is then applied to at least one variable impedance device to adjust the impedance of an impedance matching network and thereby reduce the impedance mismatch between the load and the communications device. In an embodiment, the at least one variable impedance device is a barium strontium titanate, thin film, parallel plate capacitor. In other embodiments, other variable impedance devices such as other types of thin film capacitors or varactor diodes are be used to adjust the impedance of the impedance matching network.