A multi-directional radiation leaky coaxial cable is disclosed, including an inner conductor, an insulating layer, an outer conductor and a sheath which are sequentially and coaxially nested from inside to outside. The outer conductor is provided with at least two rows of slotted hole groups, the at least two rows of slotted hole groups are distributed at different angles in a circumferential direction of the outer conductor, each row of slotted hole group includes a plurality of slotted hole arrays which are periodically arranged along an axial direction of the outer conductor, each slotted hole array includes a plurality of slotted holes, pitches of the slotted hole groups are the same, and a periodic arrangement difference of two adjacent rows of slotted hole groups in the circumferential direction is half a pitch, so that a phase difference of respective excitation electric fields is 180°. According to the leaky coaxial cable, multiple rows of slotted hole groups are arranged, a phase difference of two adjacent rows of slotted hole groups in the circumferential direction is half a pitch, and the phase difference of the excitation electric fields is 180°, so that source separation can be achieved in space, and excitation sources are independent and do not interfere with each other, thus increasing a number of radiation directions of all frequency points in an operating frequency band of the leaky coaxial cable, and making the leaky coaxial cable have a higher application scene applicability.

A method and telecommunication equipment item for detecting a cable of a network of cables, in particular of a network of electrical cables, especially ones which are not detectable to the naked eye. For example, a network of electrical cables may be embedded inside the partitions of a building. The telecommunication equipment item has a receiver and a detector of a predefined electrical signal injected into a network of cables as a function of electromagnetic signals received by the receiver. Thus, the receiver is not required to be a specific equipment item dedicated solely to this use but may be implemented in a telecommunication equipment item with which users are widely equipped such as a smartphone, a tablet, etc.

A system for EMNZ metamaterial-based direct antenna modulation. The system includes a signal generator, a metamaterial switch and an antenna. The signal generator may is configured to generate a microwave signal. The metamaterial switch is configured to generate a modulated microwave signal from the microwave signal. The modulated microwave signal is generated by selectively passing the microwave signal through the metamaterial switch. The metamaterial switch includes a first conductive plate and a first loaded conductive plate. The first loaded conductive plate includes a second conductive plate and a first monolayer graphene. The first monolayer graphene includes a first tunable conductivity. The first monolayer graphene is positioned between the first conductive plate and the second conductive plate. An effective permittivity of the metamaterial switch is configured to be adjusted to a predetermined value. The effective permittivity of the metamaterial switch is adjusted responsive to tuning the first tunable conductivity.

An antenna includes an elliptical waveguide having a plurality of length-tapered multi-slot arrays of elongate slots therein at respective spaced-apart locations along a length thereof. The plurality of length-tapered multi-slot arrays of elongate slots can include at least first and second length-tapered multi-slot arrays of elongate slots, which are spaced apart from each other along the length of the elliptical waveguide. The first length-tapered multi-slot array of elongate slots can include: (i) a first elongate slot having a first length and a first width, and (ii) a second elongate slot having a second length less than the first length and a second width that may be greater than the first width.

Aspects of the subject disclosure may include, a system that facilitates directing a first electromagnetic wave to a device positioned along a transmission medium, the device facilitating a perturbation of the first electromagnetic wave, and the first electromagnetic wave having a first field intensity near an outer surface of the transmission medium, and generating, by the device, a second electromagnetic wave having a second field intensity near the outer surface of the transmission medium that is lower than the first field intensity of the first electromagnetic wave. Other embodiments are disclosed.

A communication device for an ultra-high-speed vehicle comprises a processor for performing a radio resource control function for communication between a first mobile device and the communication device, and a plurality of distributed antennas (DAs) positioned in a path of the first mobile device and transmitting or receiving a signal according to a control of the processor. The communication device also comprises a memory for storing at least one command executed by the processor. The at least one command is executed to configure a first sliding window including n DAs corresponding to a first position of the first mobile device, among the plurality of DAs, and perform communication with the first mobile device located at the first position by using the n DAs. Therefore, the performance of a communication system can be improved.

An antenna system with co-located dipole antennas with mutually-orthogonal polarization is disclosed herein. The two antennas have planar geometry for the entire antenna and the two antennas are co-located in two mutually-orthogonal planes which provides an antenna solution for wireless communications with high isolation between the two antennas and polarization diversity in a minimum volume occupied. The two antennas operate in the same wireless communications band or in different bands.

Disclosed is a wide-band conformal coaxial antenna conformal to a surface that comprises an inner conductor, an outer conductor, and a dielectric layer. The inner conductor extends towards the surface from a coaxial input below the surface and the outer conductor surrounds the inner conductor extending from the coaxial input to the surface. The dielectric layer is between the inner conductor and the outer conductor. The inner conductor has a first inner conductor diameter at the coaxial input and a second inner conductor diameter at a distal end of the inner conductor at or proximately below the surface. The inner conductor forms an inner conductor surface at the distal end of the inner conductor and the second inner conductor diameter is larger than the first inner conductor diameter. The outer conductor has a first outer conductor diameter at the coaxial input and a second outer conductor diameter at the surface. The second outer conductor diameter is larger than the first outer conductor diameter.

The present invention relates to a system for facilitating the extraction of hydrocarbons. Tubular protection for an extraction system is provided using the RF heating of highly viscous hydrocarbons in situ by means of an antenna having a coaxial array of mode converters.

Radiating cable (100; 100a; 100b; 100c; 100d; 100e) for radiating electromagnetic energy, comprising an inner conductor (110), an outer conductor (120) arranged radially outside of said inner conductor (110), and an isolation layer (130) arranged radially between said inner conductor (110) and said outer conductor (120), wherein said outer conductor (120) comprises one or more first openings (1202), and wherein said inner conductor (110) comprises a hollow waveguide (1100).