Abstract: An assembly for a mobile communications antenna system includes a bracket assembly onto which an antenna array is mounted. The bracket assembly includes a steering arrangement configured to provide angular adjustment of an antenna beam azimuth, and an electromechanical tilting arrangement configured to adjust a tilt position of the antenna array. The steering arrangement and the electromechanical tilting arrangement are controllable in remote and manual operational modes to independently and variably adjust both azimuthal angle and tilt position of the antenna array. These operational modes ensure remote control of signal propagation and network coverage accuracy, and manual adjustment of the azimuth of the antenna beam and tilt position of the antenna array in case of field service or component failure.

Abstract: The present invention is directed to an antenna system that includes a broadband free-space antenna (i.e., an antenna that does not utilize a ground plane to create a resonant structure) and a high-impedance backing that allows the antenna to be positioned adjacent to a conductive surface that but for the high impedance backing would adversely affect the broadband operation of the antenna. The high-impedance backing substantially preserves the bandwidth of the antenna while also allowing the antenna to be positioned within ?/4 of the conductive surface and accommodate a predetermined amount of power.

Abstract: The present disclosure relates to an expandable antenna for a security system that is installed within a wall. The security system may include a control unit. The control unit may include a casing that houses one or more internal components of the control unit and a radio-frequency (RF) communication module that is situated within the casing. The RF communication module includes an antenna connected that is exposed to the exterior of the casing. An expandable antenna connects to the antenna connector. The expandable antenna is fit through an aperture in a wall and is then expanded to an enlarged size within the gap of the wall.

Abstract: An antenna arrangement 10 comprises a first elongate limb 12 and a second elongate limb 14. The first and second elongate limbs converge towards one another at a first electrical connection point 16 and a spaced second anti-phase electrical convection point 18. The first and second limbs collectively forming a closed FIG. 20 with a first appendage 22, a second appendage 24, a third appendage 26 and a fourth appendage 28 to the closed figure.

Abstract: A wideband antenna for receiving digital television signals includes a substrate, a radiating plate, a first radiating element, and a second radiating element. The radiating plate is formed on the substrate and the radiating plate has a first radiating area, a second radiating area and a slit formed between the first and the second radiating areas. The first and the second radiating elements are pivotedly connected to the radiating plate. The first radiating element and the second radiating element are constructed as a dipole antenna structure of the antenna so as to excite a first resonant mode. The radiating plate also acts as a matching circuit thereon so as to excite a second resonant mode. The center frequency of the second resonant mode is shifted toward the center frequency of the first resonant mode with the incorporation of the radiating plate so that the antenna has a wideband characteristic.

Abstract: A wideband antenna for receiving digital television signals includes a substrate, a radiating plate, a first radiating element, and a second radiating element. The radiating plate is formed on the substrate and the radiating plate has a first radiating area, a second radiating area and a slit formed between the first and the second radiating areas. The first and the second radiating elements are pivotedly connected to the radiating plate. The first radiating element and the second radiating element are constructed as a dipole antenna structure of the antenna so as to excite a first resonant mode. The radiating plate also acts as a matching circuit thereon so as to excite a second resonant mode. The center frequency of the second resonant mode is shifted toward the center frequency of the first resonant mode with the incorporation of the radiating plate so that the antenna has a wideband characteristic.

Abstract: The invention relates in part to a folded dipole having a dipole axis and a pair of arms which together have a profile which is concave on one side and convex on the other when viewed along the dipole axis. The dipoles may be arranged as a dipole box around a central region, typically in a generally circular or square configuration. Further elements may be placed in the dipole box or in the gaps between dipole boxes. The antenna may be a single-band antenna, or a multi-band antenna with the further elements operating in a different frequency band to the dipole boxes. The further elements may be concentric dipole boxes. The invention is particularly suited for use in a cellular base station panel antenna. A novel coaxial to microstrip transition is also described.

Abstract: An antenna comprising a reflective surface; and an array of dipole antenna elements disposed adjacent to the reflective surface. Each antenna element has a pair of arms which together define a dipole axis, and the dipole axis is tilted at an acute angle with respect to the reflective surface. The pair of arms may be dipole arms, or may be Yagi director arms. In some embodiments the dipole axis is tilted at an acute angle with respect to a feed axis. In some embodiments the antenna element comprises a feed portion defining a feed axis; and the feed portion has a mounting portion which is tilted at an acute angle with respect to the feed axis.

Abstract: Contactless label designed to ensure the traceability of an object featuring a microcircuit (16) and a Y-shaped dipole antenna connected to the microcircuit, which contains information necessary for tracing the object, which can be read with a reader through the exchange of ultra high frequency (UHF) electromagnetic waves. The antenna includes three main wires, a first main wire (10), a second main wire (12) forming a first dipole with the first main wire and a third main wire (14) forming a second dipole with the first main wire. The angle between the first and second main wires is equal to the angle between the first and the third main wires and the angle between the second main wire and the third main wire is between 60° and 180°. Each of the main wires features a secondary wire (24, 26, or 28) at its end perpendicular to the main wire.

Abstract: The present invention provides a digital television receiving antenna for a plug-and-play device. The digital television receiving antenna includes a first conducting portion; and a second conducting portion, coupled to the first conducting portion and having a resonance path, wherein the second conducting portion is position-adjustable relatively to the first conducting portion, and an effective length of the resonance path is greater than a straight-line distance between two end points of the resonance path.

Abstract: A reduced height log periodic antenna that may safely be positioned under the rotating blades of a helicopter sitting on the ground and still resonate in the frequency range at which the antenna was originally designed to resonate. The antenna comprises a pair of antenna booms, a first plurality of vertical antenna radiating elements connected to the booms, and a second plurality of vertical antenna radiating elements connected to the booms. In addition, the antenna includes a plurality of tuned horizontal antenna radiating elements, each tuned horizontal radiating element being connected to the top of one of the second plurality of vertical antenna radiating elements, and a plurality of tuned upwardly bent horizontal antenna radiating elements, each tuned upwardly bent horizontal antenna radiating element being connected to the bottom of one of the second plurality of vertical antenna radiating elements.

Abstract: A compact multi-polarized antenna for transmitting and/or receiving radio frequency (RF) signals, and a method for constructing same, is disclosed. The antenna comprises at least two radiative antenna elements each having a first end and a second end. The second ends of the antenna elements are electrically connected at an apex point and are disposed outwardly away from the apex point at an acute angle relative to and to a first side of an imaginary plane intersecting the apex point. The antenna also includes an electrically conductive, non-planar ground reference located at and/or to a second side of the imaginary plane.

Abstract: A wiper-type phase shifter with a cantilever shoe that ensures that the electrical contact on the wiper arm remains in electrical communication with the transmission trace located on the antenna backplane without relying to an element, such as a spring-loaded set screw, that passes through the backplane. The cantilever shoe thus provides a wiper hold-down mechanism without requiring holes or slots through the backplane, which could allow rain or other elements to get inside the antenna enclosure. A dual-polarization antenna that includes a wiper-type phase shifter for each polarization. The wiper arms define gear portions that engage each other, which allows a single actuator, typically located on the rear of the backplane opposite the location of the wiper arms, to drive both wiper arms in a coordinated manner. The antenna is suitable for use as a wireless base station antenna.

Abstract: An Rf device (100) that comprises unique MEMS RF transmission and circuit components (104–106) that are integrated together on a semiconductor chip (101) to form the RF device (100). These MEMS components (104–106) are monolithically formed on the chip (101) and are also reconfigurable on the chip (101).

Abstract: An antenna is located at the end of a wireless communication system, or other radio system, and more particularly, a wideband planar antenna with linear and circular polarization uses different polarization for transmission or reception to increase the isolation between the transmission and reception by suggestion and using a type of radiation element. The disclosed antenna is more efficient than other similar antennas that can transmit/receive linear or circular polarization. The disclosed invention makes it possible to pr vide an antenna having dual polarization, which has an orthogonal characteristic in both linear and circular polarization, and which can lower the height of the antenna by embodying a micro strip planar antenna which has linear and circular polarization that has high gain over a wide frequency band, and which transmits/receives linear or circular polarization.

Abstract: Two one-wavelength antenna elements (1) and (2) arranged in diamond-wise opposition to each other so that one-ends of the antenna elements (1) and (2) are provided with a feeding portion (3) and the other-ends (4) of the same are opened, and so that the angle (&agr;) of each of bent portions (1a) and (2a) in the centers of the antenna elements (1) and (2) respectively is selected to be an optimal angle to obtain optimal radiation directivity with a simple configuration, thereby obtaining an antenna device which has a high gain. Accordingly, a small-size and low-profile antenna device can be obtained as a mobile communication antenna in UHF and submicro wave bands.

Abstract: An compact and rugged antenna system particularly suited to direction finding includes a plurality of antenna arrays for receiving respective frequency bands and colocated on a mast with separation between antenna arrays along the mast. The mast includes a coil wound of an insulator and functioning as a loaded inductor to shift the mast resonance out of the frequency band of the antenna system. A VHF dipole array having elements shaped to reduce scattering to UHF and SHF arrays is supported on movable arms which allow retraction that reduces height and provides mechanical protection to one or more other arrays as well as damping against vibration by contacting the mast with shaped portions of the dipole elements. The bowtie elements of the UHF array are angled at a central region to optimize array diameter at low UHF frequencies. A finned RF electronics housing is preferably provided which reduces solar loading and dissipates heat from antenna electronics.

Abstract: A circularly polarized cross dipole antenna according to the present invention includes a cross dipole antenna element formed of two pairs of inverted-V-shaped dipole antenna elements, which are bent like an inverted “V” at a set angle, so as to cross each other on a ground plane, and a feeding mechanism provided to perform a single-point feed through a feeding section common to the inverted-V-shaped dipole antenna elements of the cross dipole antenna element.

Abstract: A collapsible antenna is provided; it is preferably a folded dipole antenna. The antenna has a main body section and two arm sections attached to the main body. At least one of the arms may be moved from an extended position to a collapsed position, thereby reducing the overall length of the antenna. Preferably, the arms may be rotated or pivoted from a first expanded configuration in which they extend in opposite directions from one another to a second collapsed configuration in which they subtend an angle substantially less than 180°. Preferably, the arms extend from the body section in substantially the same direction when they are in the collapsed configuration. A locking mechanism selectively secures the arms in both configurations. Alternatively, one or both arms may telescope. The invention also includes mutual inductance cancelling coils for further reducing the overall length of the antenna without reducing the effective length of the antenna.

Abstract: A hybrid shield and antenna unit for a printed circuit board is disclosed. A shielding enclosure for providing RF and electromagnetic shielding of the electronic components of a circuit board is integrated with an antenna as a single unit. The hybrid shield and antenna combination may be fabricated as a single unit to provide for reduced steps in the manufacturing process thereby leading to improved economy. The hybrid shield and antenna includes a shielding enclosure for providing RF and electromagnetic shielding of an electronic component, and an antenna disposed at an end of said central enclosure, wherein the antenna and the central enclosure comprise a single continuous unit.

Abstract: An antenna assembly includes a straw having a substantially linear passageway and a helix base coil with an angled tapered guide, the passageway having a width wider than the widest portion of the angled tapered guide. An antenna element has a stopper portion and a straw. For a vertical retraction and a slanted extension, the antenna element is movable between a slanted position wherein the antenna element is inclined from the housing when the stopper of the antenna element is positioned inside the angled tapered guide of the base coil and a retracted position substantially within the straw inside the radio housing wherein the antenna element is retracted vertically within the straw.

Abstract: A radio communication device includes a radio signal source (415) positioned in the first housing portion (101). A second housing portion (103) has a first end movably supported on the first housing portion such that the housing portions are reconfigurable between an extended position and a collapsed position. A dipole antenna (107) has a first arm (440) positioned in the first housing portion and a second arm (441) positioned in the second housing portion. A respective end of each of the arms is connected to the signal source. Plates (450, 451) are positioned on the first and second housing portions and connected to the antenna arms such that they are capacitively coupled when the housing portions are collapsed and are not coupled when the housing portions are extended.

Abstract: In order to create a directional antenna, in particular a dipole antenna, that is improved over the prior art, can be produced and is designed comparatively simply, and furthermore has further improved electrical properties, it is provided that the symmetrizer (7) is made from the material of the reflector (5), in that the symmetrizer (7) is cut from the remaining material of the reflector wall (5), except for a connecting segment (11), by suitable cuts and/or stamping operations, and preferably in the region of the immediate connecting point (11) with the remaining material of the reflector wall (5) is bent out relative to the plane of the reflector wall.

Abstract: A cabinet and antenna assembly for a television set includes an antenna which is selectively mountable at different locations on a cabinet to accommodate different signal receiving environments. When the cabinet is sitting on a lower support, the antenna is mounted at one location on the cabinet to accommodate the antenna in a position extending upward above a cabinet top surface. When the cabinet is suspended under an upper support, the antenna is mounted at a different location on the cabinet to accommodate the antenna in a position extending downward below a cabinet bottom surface.

Abstract: An antenna apparatus has a first wire-like antenna element formed into a rectangular planar loop and a second antenna element which comprises two L-shaped plates electrically connected to the loop and mounted to a rectangular planar base member. The loop is hinged to the planar base member along long sides of the respective rectangles so that the angle between the planes of the loop and base member is adjustable. The base member pivots about an axis on a mount which can be secured to a television receiver.

Abstract: An antenna arrangement for personal radio transceivers in which a main antenna extends from the housing of the transceiver which is excited by a high frequency connector thereof, includes an auxiliary antenna which is coupled to a cold terminal of the connector to form a counterweight for the main antenna. Both the main and auxiliary antennas are resonant and shorter than the quarterwavelength, whereby the housing is placed at a potential minimum and the effects of the close presence of a human body on radiational properties for the arrangement will be reduced.

Abstract: An articulated element for an antenna such as a log-periodic dipole antenna having an elongated boom comprises an inner tubular section secured to the boom and an outer tubular section movable relative to the inner section between an extended or operative position colinear with the inner section to a folded or inoperative position transversely of the inner section. The element sections are interconnected by spring means which is always in tension and exerts a compressive force between the two sections for good electrical conductivity when in the operative position while permitting the outer section readily to be pivoted to the stowed position. A T-shaped sleeve secured to the inner section has slotted longitudinal and transverse legs which releasably clamp and provide strong mechanical support of the outer section in both positions.

Abstract: An automobile antenna adapted to be mounted onto the roof of an automobile and which includes an antenna body portion formed with antenna receiving grooves which is adapted to be mounted onto the roof of the automobile with suitable suction cups or magnets mounted on the bottom of the antenna body and including a pair of rod shaped telescoping antennas which in a stored position are received in the antenna receiving grooves and which are movable to a second position to form a predetermined V-shape. Locking mechanisms lock the rod antennas in the antenna receiving grooves when in the stored position and means are provided for holding the rod antennas in the extended position when in use.