"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 7969378 | Radio antenna assembly An antenna assembly is provided for mounting on a predetermined support structure positioned on a surface, the support structure having a peripheral edge at an elevated position above the surface. The antenna assembly includes an antenna and a support for supporting... | 06/28/2011 |
| 7372006 | Low cost heating devices manufactured from conductive loaded resin-based materials Heating devices are formed of a conductive loaded resin-based material. The conductive loaded resin-based material comprises micron conductive powder(s), conductive fiber(s), or a combination of conductive powder and conductive fibers in a base resin host. The ratio... | 05/13/2008 |
| 7268479 | Low cost lighting circuits manufactured from conductive loaded resin-based materials Lighting devices are formed of a conductive loaded resin-based material. The conductive loaded resin-based material comprises micron conductive powder(s), conductive fiber(s), or a combination of conductive powder and conductive fibers in a base resin host. The rati... | 09/11/2007 |
| 7239286 | Antenna with dipole connector An antenna assembly has a lower break assembly and an upper break assembly. Both have a center fed transmission line within a conductive tube, and both are mutually connectable for connecting the transmission lines to each other at a junction. When connected, the lo... | 07/03/2007 |
| 7236139 | Low backscatter polymer antenna with graded conductivity Polymer antenna structures having low reflectivity and high efficiency are disclosed. Wire antennas can be configured from coaxial cable having center conductors and outer conductors made from conductive polymer. Fabrics can also be configured with conductive polyme... | 06/26/2007 |
| 7180460 | Antenna with power matching circuit A mobile antenna includes a center-fed, broadband, dipole radiator, and a coupler assembly for mounting the dipole radiator to a mount. A power matching circuit is connected between the dipole radiator and the coupler assembly to maintain an effective balance of cur... | 02/20/2007 |
| 7145517 | Asymmetric flat dipole antenna An asymmetric flat dipole antenna includes a first radiating body, a second radiating body, and a conductivity element. The first radiating body has a first frequency radiator, at least two second frequency radiators, and a first electrically connecting part. The se... | 12/05/2006 |
| 7109821 | Connections and feeds for broadband antennas The present invention relates to connecting and impedance matching a balanced electrical signal, such as that received by an antenna, with an unbalanced transmission circuit, such as that delivered to an amplifier. A planar circuit board is described that delivers s... | 09/19/2006 |
| 7098861 | Hooked stub collinear array antenna A hooked stub collinear array antenna formed from a single conductor. The antenna operates at a design frequency having an associated wavelength. The antenna includes a plurality of radiating elements that are substantially one half the wavelength. The radiating ele... | 08/29/2006 |
| 7053851 | Dual dipole antenna with isolation circuit A multiband antenna has a dipole radiator that resonates in a lower frequency band, and a stacked dual dipole radiator that resonates in a higher frequency band. An isolation circuit, tuned to block signals in the higher frequency band, is connected between one end ... | 05/30/2006 |
| 7042415 | Dual band and broadband flat dipole antenna A dual band and broadband flat dipole antenna comprises a first radiating body, a second radiating body, and a conductivity element. The first radiating body has two first frequency-radiating parts, two second frequency-radiating parts, and a first electrically conn... | 05/09/2006 |
| 7006050 | Low cost antennas manufactured from conductive loaded resin-based materials having a conducting wire center core Low cost moldable antennas and methods of forming the antennas are described. Elements of the antennas are conductive loaded resin-based material having a conducting wire center. The conducting wire center can be single strand, multi-strand, insulated, or non-insula... | 02/28/2006 |
| 6965353 | Multiple frequency band antenna and signal receiving system using such antenna A multiple frequency band antenna includes a dipole antenna (4a), which is formed of two dipole antenna elements (8a, 10a). Two extension elements (24a, 26a) extend outward from respective ones of... | 11/15/2005 |
| 6956539 | Multiple antenna configuration and support structure A mounting configuration for a plurality of broadcast antennas that enables location of each antenna above the top of a support structure. Antenna spacing greater than the cross section of the support structure is obtained by mounting the antennas at either end of s... | 10/18/2005 |
| 6947006 | Colinear antenna of the alternating coaxial type The invention relates to an antenna of colinear type. It comprises a radiating portion comprising: three substantially rectilinear conductive wire elements that are mutually parallel, comprising a central conductor and two lateral ... | 09/20/2005 |
| 6947005 | Low cost antennas and electromagnetic (EMF) absorption in electronic circuit packages or transceivers using conductive loaded resin-based materials Low cost antennas and electromagnetic absorbing parts formed of a conductive loaded resin-based material. The conductive loaded resin-based material comprises conductive fibers, conductive powders, or in combination thereof in a resin base host wherein the ratio of ... | 09/20/2005 |
| 6940468 | Transformers or inductors (“transductors”) and antennas manufactured from conductive loaded resin-based materials A low cost moldable transformer or trans-inductor core, referred to in this description as a transductor. Elements of the transductor core are formed of a conductive loaded resin-based material. The conductive loaded resin-based material comprises micron conductor f... | 09/06/2005 |
| 6771227 | Collinear antenna structure The present invention relates to a collinear antenna structure. The structure comprises a dipole antenna, a coil, and a set of stacked radiator, wherein the length of the dipole antenna is ½λ, the ground end and the signal end of the dipole antenna are connected t... | 08/03/2004 |
| 6720934 | Parallel fed collinear dipole array antenna A parallel fed colinear dipole array antenna for broadcasting and receiving a signal of a selected wavelength. The antenna comprises a plurality of elongate dipole antennas attached end-to-end in a linear array. A power divider divides and transmits a signal in para... | 04/13/2004 |
| 6608599 | Printed conductive mesh dipole antenna and method A printed conductive mesh dipole antenna, and a method of use of the antenna. The printed dipole antenna includes a dielectric substrate 12 and a conductive mesh 14 formed of a plurality of symmetric shapes 18 printed on the dielectric substrate. Each of ... | 08/19/2003 |
| 6518934 | Parasitically driven dipole array A steerable dipole array including a plurality of end loaded electrically short dipole antenna sections arranged along a common longitudinal axis. The antenna sections include active transmit/receive modules with a common DC power line used to power the m... | 02/11/2003 |
| 6486848 | Circular polarization antennas and methods Antenna systems employing multiple linear polarization antennas that have capacitively loaded magnetic dipoles and that are magnetically coupled to generate a circular polarization. In a first embodiment of the present invention, two intersecting linearly... | 11/26/2002 |
| 6249261 | Polymer, composite, direction-finding antenna A direction-finding antenna constructed from polymer composite materials which are electrically conductive is shown with the polymer composite materials replacing traditional metal materials. An inherent advantage of replacing metal materials is significa... | 06/19/2001 |
| 5898411 | Single-element, multi-frequency, dipole antenna A single element, multi-frequency dipole antenna including two substantially equal arm sections of conductive material extending co-axially in a straight line in opposite directions from each other, each arm section being a mirror image of the other arm s... | 04/27/1999 |
| 5568161 | Sectionalized antenna A sectionalized electromagnetic antenna formed of a plurality of co-linear stacked dipole sections. Each of the sections includes a plurality of co-linear conductor elements for conducting an electrical current. A phasing section is disposed between the c... | 10/22/1996 |
| 5187488 | Tunable high-frequency antenna Tunable high-frequency antenna which has, over its length dimension, a number of built-in switches by means of which antenna sections are defined and frequency tuning takes place through antenna length matching by disconnecting and connecting said antenna... | 02/16/1993 |
| 5087922 | Multi-frequency band phased array antenna using coplanar dipole array with multiple feed ports In a printed circuit embodiment, dielectric boards in a multilayer arrangement have their ends protruding from a ground plane. Sets of printed dipole elements are disposed along the edge of each board. Each set of dipole elements has three feed ports. Ban... | 02/11/1992 |
| 4872021 | Collinear dipole array with inductive and capacitive phasing The antenna represents colinearly arranged half-wave dipoles. On the side of each final half-wave dipole is a quarter-wave dipole. The connection between the dipoles is alternately capacitive and inductive each providing a phase shift within the range of ... | 10/03/1989 |
| 4789869 | Dipole antenna for monitoring electromagnetic waves over an extended frequency range The present invention relates to a dipole antenna for monitoring electromagnetic radiation fields over an extended frequency range with essentially flat characteristics. The dipole antenna includes two arms, each of which is divided into two or more condu... | 12/06/1988 |
| 4410893 | Dual band collinear dipole antenna A collinear dual dipole antenna is split into two sections which are connected by a central conductor extending in spaced parallel relation within hollow support mast sections, and forming an effective transmission line providing RF continuity at a high b... | 10/18/1983 |
| 4203118 | Antenna for cross polarized waves An antenna comprising a metal panel on which are mounted two parallel collinear dipole arrays spaced on the order of a half-wavelength from each other. Each dipole array is of the order of 9 wavelengths long and is fed at its center. Half way between the ... | 05/13/1980 |
| 4186403 | Antenna formed of non-uniform series connected sections An antenna comprising a collinear array of "thick" and "thin" elements selected to produce a given current distribution so that when the antenna is vertically polarized a circular horizontal plane pattern and a highly directional vertical plane pattern ar... | 01/29/1980 |
| 4087823 | Broadband dipole antenna system having three collinear radiators This disclosure deals with a three-element unit array (or stacked groups of the same) that enables the use of very large length-to-diameter dipole elements to cover broad frequency bands, greater than 2:1 in frequency ratio, by novel feed structures excit... | 05/02/1978 |
| 4031537 | Collinear dipole array with reflector This invention comprises an antenna array of collinear, end-fed dipoles spaced substantially less than one-quarter wavelength from the reflector. Consecutive dipoles are energized through phasing loops with the end dipole energized by a coaxial feeder or ... | 06/21/1977 |