Abstract: A communication system and method for vehicles, particularly trains, are described with the vehicle having antenna sets. Each antenna set includes a plurality of antennas mounted onto a convex-shaped vehicle roof in which an axis of one antenna set is approximately perpendicular to an axis of another antenna set and in which the antenna sets are mounted below roof level of the convex-shaped vehicle roof A switching device is operable to switch between a first antenna configuration and a second antenna configuration based on a difference in measured signal power received at the antenna sets. The first antenna configuration is associated with a first stationary communication system of the plurality of stationary communication systems and a second antenna configuration is associated with a second stationary communication system of the plurality of stationary communication systems.

Abstract: A multiple-input multiple-output (MIMO) based vehicle-mounted system may include a first plurality of antennas and a second plurality of antennas, with an antenna of the first plurality having different polarization than an antenna of the second plurality, an antenna of the first plurality and an antenna of the second plurality having antenna patterns in a different direction relative to at least another antenna of the first plurality and another antenna of the second plurality, and an antenna pattern of one antenna of the first plurality and an antenna pattern of one antenna of the second plurality being directed at least approximately parallel to the path. A corresponding MIMO-based stationary system may include at least a first plurality of antennas and a second plurality of antennas, with radiation patterns of the first and second pluralities being configured to overlap within an area between the first and second pluralities.

Abstract: Methods and systems for implementing and operating antennas, particularly multiple-input and multiple-output (MIMO) antennas, for radio telecommunications.

Abstract: A communication system and method for vehicles, particularly trains, are described with the vehicle having antenna sets. Each antenna set includes a plurality of antennas mounted onto a convex-shaped vehicle roof in which an axis of one antenna set is approximately perpendicular to an axis of another antenna set and in which the antenna sets are mounted below roof level of the convex-shaped vehicle roof. A switching device is operable to switch between a first antenna configuration and a second antenna configuration based on a difference in measured signal power received at the antenna sets. The first antenna configuration is associated with a first stationary communication system of the plurality of stationary communication systems and a second antenna configuration is associated with a second stationary communication system of the plurality of stationary communication systems.

Abstract: Systems and methods are provided for provisioning of telecommunications signals in moving trains. Scattering panels may be utilized for redirecting wireless signals, such as by scattering them, to provide better communication performance on the moving trains. The scattering panels may be configured to scatter the signals, such as by reflecting them. The scattering panels may be configured for operation in conjunction with a number of antennas that communicate the signals being scattered via the scattering panels.

Abstract: Systems and methods are provided for multiple-input multiple-output (MIMO) based communications between moving vehicles and stationary communication systems located along tracks used by the vehicles. A vehicle-mounted system may include antenna sets, each including a plurality of antennas mounted onto a vehicle, with each plurality of antenna having at least two pairs of antennas with orthogonal polarization with respect to each other, and within each pair the antennas being configured to have full pattern diversity based on direction of travel. A stationary communication system may include antenna systems configured to provide at least two cross-polarized RF antenna patterns in the opposite directions along a particular track. The RF antenna patterns may overlap along a section of the track. The two antenna patterns may be utilized in receiving and/or transmitting two sets of different independent signal channels.

Abstract: An antenna comprises at least one antenna element arranged in a recess of a ground conductor. A wall of the recess is arranged so that the recess tapers outward from a narrow base inside the recess to a broader mouth. The wall is configured to provide a ground plane for the at least one antenna element. The at least one antenna element comprises a conductive plate arranged perpendicular to the mouth of the recess and to the wall and arranged to provide a slot between the edge of the at least one antenna element and the wall of the recess.

Abstract: Methods and systems for implementing and operating antennas, particularly multiple-input and multiple-output (MIMO) antennas, for radio telecommunications. An antenna configured for MIMO communications may comprise a planar dielectric substrate, a first conductive annulus on a first surface of the substrate, a first conductive land on the first surface, and a second conductive land provided on the first surface. The first conductive land may lie in a region of the first surface bounded by the first conductive annulus and an edge of the first conductive land that is adjacent to, and parallel to, a portion of an inward edge of the first conductive annulus. An edge of the second conductive land may be adjacent to, and parallel to, a portion of an outward edge of the first conductive annulus.

Abstract: Systems and methods are provided for multiple-input multiple-output (MIMO) based communications between moving vehicles and stationary communication systems located along tracks used by the vehicles. A vehicle-mounted system may include antenna sets, each including a plurality of antennas mounted onto a vehicle, with each plurality of antenna having at least two pairs of antennas with orthogonal polarization with respect to each other, and within each pair the antennas being configured to have full pattern diversity based on direction of travel. A stationary communication system may include antenna systems configured to provide at least two cross-polarized RF antenna patterns in the opposite directions along a particular track. The RF antenna patterns may overlap along a section of the track. The two antenna patterns may be utilized in receiving and/or transmitting two sets of different independent signal channels.

Abstract: Methods and systems are provided for implementing and utilizing dual-polarized planar ultra-wideband antennas. An example planar antenna may include a substrate, a monopole conductor located on a first side of the substrate, a first ground conductor located on a second side of the substrate, and a second ground conductor located on the first side of the substrate. The monopole conductor may be connected to a first signal feeding line, the first ground conductor may be connected through a ground connector to ground potential, the first ground conductor may be connected to a second signal feeding line and, and the second ground conductor may be connected to ground potential located on the first side of the substrate. The planar antenna may be configured to form multiple sub-antennae during active operations. The planar antenna may also be configured to form a ring-antenna during operations.

Abstract: An antenna comprises at least one antenna element arranged in a recess of a ground conductor. A wall of the recess is arranged so that the recess tapers outward from a narrow base inside the recess to a broader mouth. The wall is configured to provide a ground plane for the at least one antenna element. The at least one antenna element comprises a conductive plate arranged perpendicular to the mouth of the recess and to the wall and arranged to provide a slot between the edge of the at least one antenna element and the wall of the recess.

Abstract: Methods and systems are provided for low-profile or hidden antennas, and for installation and use of such antennas in particular locations, such as surfaces of roadways, pavements, walls, and/or ceilings. An example antenna system may comprise a ground conductor configured to provide a ground plane for the antenna system, where the ground conductor comprises a recess, a monocone arranged in the recess of the ground conductor, and a conductive coupling between the monocone and the ground conductor to ground the monocone. A geometrical configuration of one or more components of the antenna system may be selected adaptively to set (or select) one or more property of the antenna—e.g., resonance property of the antenna.

Abstract: As a non-limiting example, various aspects of this disclosure provide embodiments of antenna apparatus using monocone antennas for wireless communication.

Abstract: A communication system and method for vehicles, particularly trains, are described with the vehicle having antenna sets. Each antenna set includes a plurality of antennas mounted onto a convex-shaped vehicle roof in which an axis of one antenna set is approximately perpendicular to an axis of another antenna set and in which the antenna sets are mounted below roof level of the convex-shaped vehicle roof. A switching device is operable to switch between a first antenna configuration and a second antenna configuration based on a difference in measured signal power received at the antenna sets. The first antenna configuration is associated with a first stationary communication system of the plurality of stationary communication systems and a second antenna configuration is associated with a second stationary communication system of the plurality of stationary communication systems.

Abstract: Methods and systems are provided for low-profile or hidden antennas, and for installation and use of such antennas in particular locations, such as surfaces of roadways, pavements, walls, and/or ceilings. An example antenna system may comprise a ground conductor configured to provide a ground plane for the antenna system, where the ground conductor comprises a recess, a monocone arranged in the recess of the ground conductor, and a conductive coupling between the monocone and the ground conductor to ground the monocone. A geometrical configuration of one or more components of the antenna system may be selected adaptively to set (or select) one or more property of the antenna—e.g., resonance property of the antenna.