Abstract: A unidirectional wireless antenna with a front-to-back ratio of 20 dB comprises a loop antenna and a dipole antenna interconnected by a metallic element and printed on a printed circuit board. The antenna is small in size but provides good unidirectional transmission.
October 23, 2008
Date of Patent:
April 2, 2013
City University of Hong Kong
Edward Kai Ning Yung, Pak Wai Chan, Hang Wong
Abstract: This disclosure discloses an RFID tag communication apparatus comprising: a housing including a bottom surface; an antenna provided at a distance h from the bottom surface; and a radio frequency circuit including a carrier wave transmitting device that generates a carrier wave of a frequency fc; wherein the correlation as fo<fc<fm is satisfied under the conditions of a resonance frequency fm of the antenna when the bottom surface is fixed in contact with a metal surface, a resonance frequency fo of the antenna when the bottom surface is fixed in contact with a non-metal surface.
Abstract: According to one embodiment, an antenna array includes a plurality of racks that are each configured with a plurality of antenna elements. Each rack may be rotated relative to the other racks through an axis that is generally parallel to the axis of other racks. Each antenna element within each rack has an axial orientation that is generally similar to and has an elevational orientation that is individually adjustable relative to one another.
March 13, 2009
Date of Patent:
May 25, 2010
James A. Pruett, Timothy E. Adams, Christopher T. Moshenrose, Jerry M. Grimm
Abstract: To avoid searching for a new location for very high hectometric wave antennas, an antenna according to the invention comprises an existing vertical structure having a height of at least approximately ten meters and including at least one electrically conductive element connected to the ground, and an excitation conductor wire (4a) that is essentially electrically conductive, disposed at least in part in the vicinity of and outside the structure and connected to a emitter (E) so that the structure radiates substantially hectometric waves. The existing structure may be a broadcasting tower, a water tower, a chimney, a lighthouse or a lamp standard, wherein the excitation wire merges visually. The wire can be replaced by a conductive loop a few meters long, magnetically coupled to the structure.
Abstract: A contactless memory card that includes a card body (1), an integrated circuit (3) embedded in the card body, and a coupling antenna (4) connected to two contact pads (6) of the integrated circuit. The antenna is made in a spiral pattern, with its turns passing over the flush face (5) of the integrated circuit.
Abstract: This invention provides an improvement in Glide Slope antenna systems of the earth-image type. The standard antenna usually is mounted on a steel tower located several hundred feet to one side of the runway, considered a safe distance to avoid being struck by an airplane. This invention, however, employs an antenna system using wide aperture slotted cable elements. Frangible construction permits it to be located safely much closer to the runway. The closer spacing, with the wide aperture, provides for a vertical guidance pattern that is narrower in azimuth, resulting in improved quality of guidance. An additional slotted cable, fed only with clearance signal, provides fly-up indication, both sides, over a wider azimuth sector.
January 20, 1999
Date of Patent:
February 5, 2002
Watts Antenna CO
Chester B. Watts, Jr., John Henry Johnson
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 flexible antenna which operates to control both the reactance as well as the resistance of the antenna. A motorized pulley system attached between two supports is utilized to control the effectrive length of the wire as well as the height of the antenna above ground. The antenna includes a flat base portion suspended between the supports and leg portions extending from the base to the apex of the triangle close to the ground. The total length of the antenna as well as the height of the base portion above the ground is dependent upon the particular frequency which is to be transmitted or received.
Abstract: A dipole antenna and a feedline therefor both formed from coaxial line. The dipole coaxial line has the jacket removed from a central portion thereof to expose the outer conductor which is there severed and spread apart to form a gap exposing the dielectric layer, the lengths of coaxial line on each side of the gap comprising dipole elements. The feedline has the jacket removed from one end portion thereof with its inner conductor being connected to the outer shield conductor of one dipole element on one side of the gap and the outer conductor thereof being connected to the outer shield conductor of the other dipole element on the other side of the gap thereby to form center feedpoint connections between the feedline conductors and the dipole elements. Clamping means comprising a pair of relatively thin flat clamping members of substantially rigid insulating material are provided to be fastened together face to face with the feedpoint connections and adjacent coaxial line portions therebetween.
Abstract: An antenna configuration in which multiple frequency band coverage is obtained in simple structures. This invention is most useful in the high-frequency spectrum where other techniques of providing multiple frequency operation become physically difficult to implement. The antenna configuration includes a multiplicity of conductor elements, a coaxial cable network for interconnection of the elements and connection to a feedline, and a high permeability core to aid decoupling to the feedline exterior from the antenna proper.