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Patent Searching and Data


Matches 601 - 650 out of 2,787

Document Document Title
WO/1999/017395A2
A quadrifilar antenna for use in satellite communications comprises four conductive elements arranged to define two separate helical pairs, one slightly differing in electrical length than the other, defined by a cylinder of constant rad...  
WO/1999/017398A2
Radiotelephone antennas include rigid antenna elements integral to the antenna substrate or housing. As such, the present invention configures the antenna without requiring a separate flex circuit winding to provide the conductive windin...  
WO/1999/014819A1
Antenna systems for transmitting and receiving electrical signals in two widely separated frequency bands are provided which comprise a helix antenna and a parasitic element which is adjacent to the helix antenna. The parasitic element i...  
WO/1999/009609A1
A contrawound helical winding is manufactured by forming first (30) and second (40) conductors in respective first and second cyclic patterns of opposite spatial phase relative to one another and which cross one another at a plurality of...  
WO/1999/009608A1
An electromagnetic antenna (10) comprises a continuous conductor (12) comprising a first length portion (14) and a second length portion (16), the first and second length portions each having a first end and a second end whereby the firs...  
WO/1999/009536A1
A highly efficient resonant switching driver circuit (10) includes a matching reactance (16) coupled between a resonant antenna (12) and a driver circuit (14). The matching reactance performs a series to parallel impedance match from the...  
WO/1999/007032A1
A process for manufacturing a helix antenna in a simple manner is characterised by the following steps: 1. an injection-moulded preform (1) made of a metallisable plastic material and consisting essentially of a cylindrical core (4) join...  
WO1998050982A3  
WO/1999/003169A1
A retractable antenna (10) for use with a communications device such as a cellular telephone is described and which may be moved from a fully extended position to a fully retracted position with respect to the telephone housing. The tele...  
WO/1999/001908A1
A helical antenna having stubs spaced along the helix curve length and extending toward the central axis of the helix, such that the performance characteristics of the antenna, such as gain and circular polarization, are maintained while...  
WO1998044589A3  
WO/1998/056072A1
A method for producing an antenna (10), by introducing a moldable material into a mold and molding the material in the mold into an antenna having a desired shape, preferably a helical shape (12). The method is used to produce an antenna...  
WO/1998/053524A1
A multiple frequency band, multi-spiral antenna (50) that employs filters (88, 90) to pass the band of one spiral (60) and reject the band of the other spirals (70). Additional isolation is achieved by arranging adjacent spirals to have ...  
WO/1998/053523A1
A radiotelephone matching switching system and associated antenna and printed circuit board contact configurations for a retractable antenna employ at least two contacts which are traversely spaced apart in the radiotelephone housing so ...  
WO/1998/050982A2
A method and an apparatus are described which will allow an Integrated Services Digital Network (ISDN) subscriber to establish a permanent or semi-permanent connection to a data network using the D channel as a low-speed, low-cost connec...  
WO/1998/049749A1
A hybrid logarithmic yagi antenna system (10) characterized by the absence of a balum or other conventional log periodic yagi antenna system balanced feed and impedance matching means. The reflector (12) is configured as a supporting con...  
WO/1998/049740A1
Radiotelephones configured with integrated matching circuit components in the housing and antenna are disclosed. The present invention configures the antenna and the associated housing receiving passage to define a capacitor and inductor...  
WO/1998/044589A2
A dual-band helical antenna provides operation in two frequency bands. The dual-band helical antenna includes two single-band antennas (1304, 1308), each having a feed network (1804, 1808), a ground plane (412) opposite the feed network,...  
WO/1998/044590A1
An area-efficient network is configured such that a section of the feed network (1804, 1808) is disposed on a radiator portion of an antenna (1304, 1308) and the remainder of the feed network is disposed on a feed portion. Because part o...  
WO1998030038A3
A multi-piece retractable radiotelephone antenna and associated communication method is employed to provide improved signal quality. The multi-piece antenna includes conductive windings, such as helical quadrafillar windings, disposed se...  
WO/1998/043313A1
A communication antenna (10) having a driven element (16) extending between a feed point (13) and an attachment point (15) to a top loaded element in which the driven element (16) is longer than the shortest distance (P) between the feed...  
WO/1998/042042A1
The invention concerns an antenna for re-transmitting to the ground images produced by an orbiting satellite imaging instruments, characterised in that it comprises a plurality of elementary radiating antennae (1) with a plurality of cor...  
WO/1998/040930A1
An RFID circuit for incorporation in an identification device which includes a polymeric substrate (12), the circuit being formed or integrally connected with said substrate whereby the substrate becomes a component of the RFID circuit. ...  
WO/1998/039816A1
An antenna element for circular polarization is described. It comprises a ground plane (1), with first to fourth radiation members (2-5) in the form of helical wires, symmetrically arranged around a symmetry axis (6), as well as a distri...  
WO/1998/036469A1
The present invention presents an antenna device for an automotive vehicle comprising first coil installed horizontally to receive radio signals, capacitors connected with the first coil in electrical parallel, second coil connected elec...  
WO/1998/033231A1
An improved antenna for a radio transmitter and receiver which is capable of more efficiently transmitting and receiving radios by providing the same in a radio transmitter and receiver such as a Personal Communication Service (PCS) syst...  
WO/1998/031069A1
A helical antenna element including a metallic coil, a dielectric support element inserted in the coil, the support element being formed with a generally hollow core, and a dielectric tuning element inserted into said core, the tuning el...  
WO/1998/031067A1
A dual band antenna for a mobile communication system which includes: a metal tube having an open end; a coaxial feed line having inner and outer conductors, with one portion of the coaxial line inserted into the metal tube, a ground pla...  
WO/1998/030038A2
A multi-piece retractable radiotelephone antenna and associated communication method is employed to provide improved signal quality. The multi-piece antenna includes conductive windings, such as helical quadrafillar windings, disposed se...  
WO/1998/028817A1
A quadrifilar helix antenna system capable of providing a positive gain, quasi-hemispherical antenna pattern over widely separate transmit and receive frequency bands. This new antenna system comprises concentrically arranged, but electr...  
WO/1998/028815A1
Physically small quadrifilar helix antenna systems capable of providing a positive gain, quasi-hemispherical antenna pattern over a relatively broadband frequency range in the L-Band frequency band. The antenna systems according to the p...  
WO/1998/028816A1
Quadrifilar helix antenna systems for half-duplex communications which are capable of providing a positive gain, quasi-hemispherical antenna pattern over widely separate transmit and receive frequency bands. The antenna systems according...  
WO/1998/028814A1
An antenna operable in two disparate frequency bands is disclosed as including a first quadrifilar helix having four conductive elements arranged helically to define a cylinder of substantially constant radius, where the first quadrifila...  
WO/1998/024143A1
The present invention relates to a thin antenna in which an eletric conductor (20) of a helical shape is formed at a thin plate (10). The thin antenna has a construction that the thin plate (10) composed of an insulating material has a p...  
WO/1998/024144A1
A dielectric-loaded loop antenna for operation at frequencies above 200 MHz has an elongate cylindrical core with a relative dielectric constant greater than 5, a pair of co-extensive helical antenna elements, a coaxial feeder structure ...  
WO/1998/021779A1
An antenna assembly having an operating frequency and a vertical radiation pattern with a main lobe axis defining a downtilt angle with respect to the earth's surface. The antenna assembly comprises a plurality of antennas in first, seco...  
WO/1998/018178A1
A tilted helical element antenna array has increased effective aperture. By tilting individual helical radiators relative to one another, the region of aperture overlap may be decreased to thereby increase the effective aperture of the a...  
WO/1998/015028A1
According to exemplary embodiments of the present invention, non-uniform helical antennas are described for use in two or more frequency hyperbands. For example, non-uniform helical antennas can be designed according to the present inven...  
WO/1998/015029A1
According to exemplary embodiments of the present invention, retractable antennas are described for use in two or more frequency hyperbands. The retractable antennas can include a whip antenna, operable when the retractable antenna is ex...  
WO/1998/011623A1
A dielectric-loaded antenna for operation at frequencies over 200 MHz has a cylindrical ceramic core (12) with a relative dielectric constant greater than 5. The core is formed with recesses (34A, 34B, 34C, 34D) in its cylindrical outer ...  
WO1997037401A3  
WO/1998/005087A1
A dual-band coupled-segment helical antenna is provided operating in two frequency bands. The dual-band coupled-segment helical antenna (1200) includes a radiator portion (1202) having two sets of one or more helically wound radiators (1...  
WO1997041695A3  
WO/1998/005090A1
A bent-segment helical antenna (700A, 700B) utilizes one or more radiators (720) wrapped in a helical fashion. The radiators (720) are comprised of a plurality of segments (712, 714, 716). A first segment (712) extends from a feed networ...  
WO/1998/002936A1
A modified helical antenna having increased gain over that of a conventional axial mode helical antenna (200) without increasing the length of the antenna. The modified helical antenna (700) uses a conducting cylinder (702) placed around...  
WO/1998/001920A1
The invention discloses a transmission device comprising an antenna having a plurality of aerial wires (B�1? to B�4?) uniformly distributed in helical configuration about a common cylindrical generator, and means (C, U) for supplying...  
WO1997042682A3  
WO/1997/042682A2
A Multi-Band, Concentric Helical Antenna (20) operating in a conical mode which produces a uniform radiated flux within a footprint is disclosed. This antenna offers substantial benefits for satellite communication systems, since the siz...  
WO/1997/041695A2
A coupled multi-segment helical antenna is provided having a length that is shorter than otherwise obtainable for a conventional half-wavelength antenna. The coupled multi-segment helical antenna includes a radiator portion (800) having ...  
WO/1997/040548A1
A composite antenna with which stable communication with communication satellites flying in any direction in the sky is possible. A microstrip planar antenna and a helical antenna are arranged substantially coaxially, and the ground cond...  

Matches 601 - 650 out of 2,787