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Patent Searching and Data


Matches 651 - 700 out of 2,790

Document Document Title
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...  
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...  
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...  
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...  
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 ...  
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...  
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...  
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...  
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...  
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 ...  
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 ...  
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...  
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 ...  
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 ...  
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...  
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...  
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 ...  
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...  
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 ...  
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...  
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...  
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...  
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...  
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...  
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...  
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).  
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...  
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...  
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 (...  
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...  
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...  
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;...  
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...  
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...  
WO/1996/007215A1
A quadrifilar helical antenna including four conductive helices having a common central axis, a common direction of turn about said axis, a common pitch, and a common length between opposite ends, the helices being uniformly spaced from ...  
WO/1996/006468A1
An antenna for use at UHF and upwards has a cylindrical ceramic core (12) with a relative dielectric constant of at least 5. A three-dimensional radiating element structure, consisting of helical antenna elements (10A - 10D) on the cylin...  
WO/1996/000990A1
An antenna device is provided with a spiral first antenna and linear second antenna which slides in the first antenna in the axial direction. When this antenna device is housed, the upper end of the conductor portion of the second antenn...  
WO/1995/012224A1
The invention relates to a broadband antenna means which comprises a first and a second helical antenna (203, 207) wherein the antennas (203, 207) have different resonance frequencies. An antenna which has essentially a larger bandwidth ...  
WO/1994/027338A1
A mobile vehicular antenna for use in accessing stationary geosynchronous and/or geostable satellites. A multi-turn quadrifilar helix antenna (300) is fed in phase rotation at its base and is provided with a pitch and/or diameter adjustm...  
WO/1994/021002A1
A mechanically steerable antenna suitable for mobile earth stations of satellite communication systems comprises a support member (12; 74) mounted upon a base member (14; 72) and an active antenna element (10; 70) or array of elements mo...  
WO/1994/021005A1
An antenna suitable for mounting upon vehicles, vessels or aircraft for communication via satellites comprises a conductive ground plane (18; 124) and a radiator element in the form of a conductor (20; 120) helically wound to define a fr...  
WO/1994/016471A1
An antenna (102) for simultaneously transmitting and receiving electromagnetic energy is disclosed. The antenna (102) includes first and second transmit element (104, 106) and a transmitter (108) for supplying a first current to the firs...  
WO/1994/016472A1
It is an object of the present invention to receive simultaneously signals with different polarizations with the aid of helical feeders without gain degradation compared to known systems. According to the invention two or more helical fe...  
WO/1994/014207A1
The aim of the invention is to reduce significantly the number of parts required to produce an antenna (4). This is achieved by virtue of the fact that the antenna consists only of a core element (5) and a sheath (6) which can be slid ov...  
WO/1994/010720A1
The antenna device of the present invention is intended for a portable equipment for transmitting and/or receiving radio signals. Said antenna device comprises a helical antenna (6) substantially having the characteristics of a half-wave...  
WO/1994/006170A1
An array of collinear coaxial lines (11, 13) utilizes standard size brass tubing (23c, 24c) with brass rods (23a, 24a) inserted therein to establish each half-wavelength coaxial section. A coupler (20) positioned between each half-wavele...  
WO/1993/022804A1
A variable helix antenna consisting of one or more conductors (35, 36) affixed to a furled dielectric sheet (30). The antenna beam being steerable by furling and unfurling of the dielectric sheet either rotationally, axially or by a comb...  
WO/1993/011582A1
Arrangements of compact broadband microstrip antennas are disclosed. Each arrangement comprises a dielectric material (32, 62) with the microstrip antennas mounted to one side and a ground surface (GP) on the opposite side. A first arran...  
WO/1993/006631A1
A VHF radio (10) which includes an adjustable antenna (20) formed from a component (28) shaped like an open helical compression spring which engages and can be screwed into a metal supporting collar (40) for tuning the antenna (20). An e...  
WO/1992/021159A1
The present invention presents a radiowave antenna system, which includes means for the concentration of said means, like a parabolic reflector or a Luneburg-type lens. A primary feed (14), which receives the concentrated radiowaves, is ...  

Matches 651 - 700 out of 2,790