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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...
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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...
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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...
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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...
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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 ...
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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...
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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...
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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...
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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...
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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 ...
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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...
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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...
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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...
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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...
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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...
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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 ...
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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...
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WO/1997/039493A1 |
A small-sized planar antenna attached to a portable radio device is only for a narrow band. Therefore, the resonance frequency of the antenna is fluctuated by the interaction between the antenna and a peripheral dielectric, such as the e...
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WO/1997/037400A1 |
A helical antenna (1) is manufactured by plating a first molded body (7) provided with a spiral groove (4) in the surface of an insulator, a fitting section (3) at one end, and a boss section (6) for cutting at the other end while the bo...
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WO/1997/037401A2 |
In a radio communication system operating in at least two spaced-apart frequency bands above 200 MHz, a quadrifilar helical antenna (1) having an elongate dielectric core with a relative dielectric constant greater than 5 has a conductiv...
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WO/1997/035357A1 |
A helical antenna with built-in duplexing means, including two decoupled coaxial helices that each consist of printed radiating wires (111 to 114) on a substrate and are combined with respective separate miniaturised broadband radiating ...
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WO/1997/035356A1 |
A resonant helical antenna including at least one helix consisting of at least two radiating wires (111 to 114) printed on a substrate, a miniaturised broadband radiating wire power supply structure printed on said substrate, and at leas...
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WO/1997/033341A1 |
When the peripheral length C of a single-wire spiral antenna is set at, for example, 2.3 'lambda' ('lambda': wavelength of using frequency), the beam radiated from the Z-axis perpendicular to the surface of the antenna tilts. The tilting...
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WO/1997/027642A1 |
A miniature antenna (10) for operation at frequencies in excess of 200 MHz has a ceramic core (12) in the form of a cylindrical rod having a relative dielectric constant greater than 5. Plated on the outer surfaces of the core is an ante...
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WO/1997/019488A1 |
When the antenna element of an antenna is expanded, a helical element (4) acts as a parasitic element, and a high-frequency current flows through an element conductor (3), causing the element (4) to act as a parasitic element which is ex...
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WO/1997/011507A1 |
A dual-band octafilar helix antenna (100) operational at two frequencies, while maintaining a relatively small package size. The dual-band octafilar antenna (100) is manufactured by disposing radiators (104, 1304, 2304, 2306) and a feed ...
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WO/1997/010623A1 |
A new and improved antenna-transmission line coupling system is provided wherein the electro-magnetic oscillations in the antenna are prevented from entering the circuitry which couples the antenna to its transmission line. The coupling ...
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WO/1997/007560A1 |
An antenna (20) including a continuous planar conductor (22) disposed in a coaxial connector. The planar conductor (22) is made by stamping an array of slots (30) in a continuous sheet of metal with ends of adjacent slots (30) being offs...
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WO/1997/007559A1 |
An electrically small antenna is disclosed that is constructed from a generalized contrawound toroidal helix (1, 2) made from a single continuous conductor divided into two length portions each of which are substantially the same length ...
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WO/1997/006575A1 |
A 180� power divider (1100) accepts an input signal and splits it into two ouput signals that are equal in amplitude and differ in phase by 180�. In a first region (1132), an unbalanced input signal travels along a trace (1108) on a ...
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WO/1997/006579A1 |
A quadrifilar antenna is comprised of four radiators which, in the preferred embodiment, are etched onto a radiator portion of a microstrip substrate. The microstrip substrate is formed into a cylindrical shape such that the radiators ar...
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WO/1997/006577A1 |
An antenna structure (10) includes a plurality of transmit linear elements (22a-22d) arranged parallel to one another and a plurality of receive linear elements (24a-24d) also arranged parallel to one another. Individual ones of the plur...
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WO/1997/004895A1 |
A composite structure (26) comprises a body (27) having a surface. Cladding (28) covers at least a part of the surface. The body (27) and the cladding (28) are formed of different materials, at least one of which is a shape memory alloy ...
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WO/1997/002622A1 |
The invention is directed to an antenna assembly which, when a rod antenna unit is retracted in the radio housing, permits transmission and reception with no influence thereon by the retracted rod antenna unit and which resonates with tw...
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WO/1997/001197A1 |
The present invention provides a method (400) and antenna (100) for providing an omnidirectional pattern. The antenna (100) is smaller than prior art omnidirectional antennas with the same bandwidth. The smaller size is made possible by ...
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WO/1997/001196A1 |
An antenna element is described. It comprises a ground plane (1) and a conical support (2) of a dielectric that with its bottom portion is attached to the plane and supports first to fourth radiation means having the shape of helical wir...
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WO/1997/000542A1 |
A double helix antenna (10) comprised of orthogonally-wound helix conductors. The double helix antenna (10) includes a first helix conductor (14) wound in a first direction about a vertical axis, V, of the double helix antenna (10). A se...
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WO/1996/041397A1 |
An antenna is disclosed that has windings that are contrawound in segments on a toroid form and that have opposed currents on selected segments. An antenna is disclosed that has one or more insulated conductor circuits with windings that...
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WO/1996/041398A1 |
An antenna is disclosed that has windings that are contrawound in segments on a toroid form and that have opposed currents on selected segments. An antenna is disclosed that has one or more insulated conductor circuits with windings that...
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WO/1996/041399A1 |
A transmit and receive loop antenna (10) includes a first loop element (12) coupled to an electrical circuit element for generating near fields and far fields and a shunt loop element (16) surrounding the first loop element (12) such tha...
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WO/1996/036087A1 |
The proposal is for a process for producing a helical aerial in which glass fibres (4) are extruded together with a curable plastic compound (5) to form a glass-fibre rod (1), the compound (5) is cured, an electrically conductive wire (2...
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WO/1996/036089A1 |
The proposal is for a process for producing a rod aerial. Here, an electrically non-conductive rod (1) is coated with an electrically conductive paste (5).
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WO/1996/034425A1 |
An efficiently radiating helical antenna includes a conductive helix receiving signals to be radiated at a first end of the conductive helix device for capacitively pulling fields generated by the signals towards a second end of the cond...
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WO/1996/029787A1 |
A mobile communication system includes a bracing system that protects and secures the internal components of a mobile communication system. The bracing system includes an upper housing (230) comprised of a shock resistant material. The u...
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WO/1996/024965A1 |
An antenna which operates in two frequency bandes even when its sliding antenna section (30) is housed in or pulled out from an enclosure. The antenna system is provided with a fixed antenna section (20) and the sliding antenna section (...
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WO/1996/022618A1 |
A loop antenna for circularly polarized wave has a simple structure and can receive circularly polarized waves over a wide band. Electric power to be radiated and fed to a feeding point (5) through a coaxial line (4) and a feeding conduc...
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WO/1996/019846A1 |
An adjustable helical antenna in which the length and pitch of the antenna may be varied whilst the radius is kept substantially constant. Ends of the wires (23a-d) may be secured to first and second carriages (15a, 15b) which may be mov...
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WO/1996/018220A1 |
A helical antenna having one or more wires (3, 3a, 4, 5; 14, 15, 16, 17; 27, 28, 29) fed at a voltage maxima along each wire at resonance. Preferably the antenna is a multifilar helical antenna and the wires (3, 3a, 4, 5; 14, 15, 16, 17;...
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WO/1996/015564A1 |
A shell structure for a collinear coaxial element array antenna is made of electrical conducting material and includes first (11) and second (13) circular sections separated by a web (15). The first circular section has an inner diameter...
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WO/1996/007216A1 |
Each conductor of the antenna is fed with a successively delayed phase representation of the input signal to optimize transmission characteristics. Each of the conductors is separated into a number Z of discrete conductor portions by Z-1...
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