A tapered Microstrip Leaky Wave Antenna (MLWA) may include: a grounded metallic plane; conducting traces disposed on the grounded metallic plane, the conducting traces may include: a tapered leaky section extending in a first direction from a first end of the tapered leaky section to a second end of the tapered leaky section, the tapered leaky section including two rectangular slots; and a monopole disposed at the second end of the tapered leaky section and extending in a second direction, the second direction crossing the first direction, a dielectric layer disposed between the grounded metallic plane and the conducting traces; and three Yagi elements disposed adjacent to at the second end of the tapered leaky section in parallel with the monopole.

Antenna system having an antenna array with multiple sub-arrays, each having one or more antenna elements, is calibrated using a distributed calibration antenna element, such as a leaky coaxial cable, that spans across at least two and possibly all of the sub-arrays. To calibrate the transmit (TX) paths of the sub-arrays, TX calibration test signals are transmitted by the sub-arrays, captured by the distributed calibration element, and processed by a corresponding calibration radio. To calibrate the receive (RX) paths of the sub-arrays, an RX calibration test signal is generated by the calibration radio, transmitted by the distributed calibration element, captured by the sub-arrays, and processed by their corresponding radios. Cross-correlation between the calibration and captured signals is performed to derive the complex gain of each sub-array transmitter and receiver, which provides information for aligning the gain, phase, and delay of the different TX and RX paths of the antenna array.

The present invention relates to a device for generating a disturbance in the differential mode of propagation of an RF signal transmitted along a coaxial transmission line.

A wind turbine has an object position and/or speed detection device including: at least one leaky feeder, at least one electromagnetic transmitter connected to the least one leaky feeder for transmitting a first electromagnetic signal along the at least one leaky feeder towards a target object, whose position is to be detected, at least one electromagnetic receiver connected to the least one leaky feeder for receiving from the at least one leaky feeder a second electromagnetic signal, the second electromagnetic signal reflected from the target object when the first electromagnetic signal hits the target object, a processing unit connected to the electromagnetic transmitter and the electromagnetic receiver and configured to analyze the first electromagnetic signal and the second electromagnetic signal for determining the position and/or speed and/or direction and/or the size of the target object.

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.

A connector assembly that provides a proper impedance connection between a CPW antenna mounted on automotive glass to a FAKRA-type connector. The connector assembly includes a PCB having a top surface and a bottom surface and being adhered to the glass. Vias are provided through the PCB to make electrical contact between metallization planes on the top surface and the bottom surface of the PCB. Terminals that are part of the connector extend through some of the vias, where ground terminals provide mechanical stability and make electrical contact with the metallization planes on the bottom surface of the PCB and a signal terminal provides an electrical connection to the antenna radiating element. The PCB is adhered to a substrate on which the antenna is mounted so that the metallization planes and microstrip lines make electrical contact with a CPW feed structure that feeds the antenna.

In one example an apparatus is provided. The apparatus includes a low frequency radiator, a high frequency radiator, a high frequency waveguide that carries high frequency bands to the high frequency radiator, a low frequency coaxial waveguide coupled to the high frequency waveguide in a coaxial structure, wherein the low frequency coaxial waveguide carries low frequency bands to the low frequency radiator and a low frequency combiner in communication with the low frequency coaxial waveguide, wherein the low frequency combiner comprises a circular low frequency waveguide and air dielectric transmission lines formed by air channels formed above and below a plurality of printed circuits in a metal housing.

Provided is an apparatus for detecting properties of a rotor blade of a wind turbine the apparatus including: at least one leaky feeder configured to be arranged around the tower, an electromagnetic transmitter connected to the at least one leaky feeder and configured for transmitting a first electromagnetic signal along the at least one leaky feeder, a reflector for diverting and/or focusing the first electromagnetic signal in a predetermined direction, thereby forming a reflected first electromagnetic signal, an electromagnetic receiver connected to the at least one leaky feeder and configured for receiving a second electromagnetic signal from the at least one leaky feeder, the second electromagnetic signal being reflected from the rotor blade, and a processing unit connected to the electromagnetic transmitter and the electromagnetic receiver and configured to determine the properties of the rotor blade by analysing the first electromagnetic signal and the second electromagnetic signal.

There is provided an integrated leaky feeder and mesh network system. The system includes a plurality of mesh nodes, each mesh node comprising a radio, at least one of the mesh nodes being powered by a power source. The system also includes a radiating coaxial cable connecting the plurality of mesh nodes to provide a leaky feeder signal between the nodes.

A system for detecting rotor blade position and/or rotor blade speed during operation of a wind turbine (1) is provided, the wind turbine (1) including a tower (2) and at least one rotor blade (4). The system comprises a leaky feeder arrangement (10) configured to be mounted at the tower (2) of the wind turbine (1), an RF unit (20) coupled to the leaky feeder arrangement (10) and configured to supply a first radar signal (100) to the leaky feeder arrangement (10) and to receive a second radar signal (200) from the leaky feeder arrangement (10), wherein the second radar signal (200) is reflected from the rotor blade (4) when the first radar signal (100) hits the rotor blade (4), a processing unit (30), and an optical link arrangement (40) interconnecting the processing unit (30) and the RF unit (20). The processing unit (30) is configured to analyse a first signal corresponding to the first radar signal (100) and a second signal corresponding to the second radar signal (200) in order to determine the position and/or the speed of the rotor blade (4). A wind park and a method are also provided.