Aspects of the subject disclosure may include, for example, receiving, by a feed point of a dielectric antenna, electromagnetic waves from a dielectric core coupled to the feed point without an electrical return path, where at least a portion of the dielectric antenna comprises a conductive surface, directing, by the feed point, the electromagnetic waves to a proximal portion of the dielectric antenna, and radiating, via an aperture of the dielectric antenna, a wireless signal responsive to the electromagnetic waves being received at the aperture. Other embodiments are disclosed.

Method and apparatus for coupling an antenna to a device

A distributed antenna system is provided that frequency shifts the output of one or more microcells to a 60 GHz or higher frequency range for transmission to a set of distributed antennas. The cellular band outputs of these microcell base station devices are used to modulate a 60 GHz (or higher) carrier wave, yielding a group of subcarriers on the 60 GHz carrier wave. This group will then be transmitted in the air via analog microwave RF unit, after which it can be repeated or radiated to the surrounding area. The repeaters amplify the signal and resend it on the air again toward the next repeater. In places where a microcell is required, the 60 GHz signal is shifted in frequency back to its original frequency (e.g., the 1.9 GHz cellular band) and radiated locally to nearby mobile devices.

Remote distributed antenna system

Aspects of the subject disclosure may include, for example, a device that facilitates transmitting electromagnetic waves along a surface of a wire that facilitates delivery of electric energy to devices, and sensing a condition that is adverse to the electromagnetic waves propagating along the surface of the wire. Other embodiments are disclosed.

Method and apparatus for sensing a condition in a transmission medium of electromagnetic waves

Aspects of the subject disclosure may include, for example, a system for detecting a fault in a first wire of a power grid that affects a transmission or reception of electromagnetic waves that transport data and that propagate along a surface of the first wire, selecting a backup communication medium from one or more backup communication mediums according to one or more selection criteria, and redirecting the data to the backup communication medium to circumvent the fault. Other embodiments are disclosed.

Method and apparatus that provides fault tolerance in a communication network

Aspects of the subject disclosure may include, for example, a transmission device that includes a transmitter that generates a first electromagnetic wave to convey data. A coupler couples the first electromagnetic wave to a single wire transmission medium having an outer surface, to forming a second electromagnetic wave that is guided to propagate along the outer surface of the single wire transmission medium via at least one guided wave mode that includes an asymmetric or non-fundamental mode having a lower cutoff frequency. A carrier frequency of the second electromagnetic wave is selected to be within a limited range of the lower cutoff frequency, so that a majority of the electric field is concentrated within a distance from the outer surface that is less than half the largest cross sectional dimension of the single wire transmission medium, and/or to reduce propagation loss. Other embodiments are disclosed.

Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith

An offfset imaging antenna system with compensated optical aberrations comprises a main a paraboloid reflector (4), a first paraboloid sub reflector (6), and a first feeding array (8) as an arrangement of first feed array elements to illuminate or to be illuminated by the first sub reflector. The main reflector (4) and the first sub reflector (6) are confocal by sharing a common focal point. The first feeding array (8) has a curved shape that corresponds to a first equivalent array (12) of magnified image feed elements (14) lying on a plane (16) crossing the main optical centre and perpendicular to the main bore-sight axis, all the first feed array elements (10) being positioned as to provide a planar distribution of the positions of the image feed elements (14) onto the first equivalent array (12) after a second reflection by the main reflector (4) with a central image point coinciding with the main reflector optical centre under a maximum illumination condition.

Imaging antenna systems with compensated optical aberrations based on unshaped surface reflectors

Imaging reflector systems, also known as magnified phased array antennas, combine the advantages of reflectors and arrays in one architecture. They are particularly attractive for satellite applications requiring a high number of beams with some reconfigurability capability. They are able to scan one beam electronically or to generate a multibeam coverage in a limited field of view. The caustics of this antenna system are analyzed adopting a geometrical optics procedure and a semi-deterministic phase compensation procedure is proposed for reducing the scanning aberrations.

Christian Sciannella

Papers

Imaging antenna systems with compensated optical aberrations based on unshaped surface reflectors

An Imaging Reflector System with Reduced Scanning Aberrations