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

PROBLEM TO BE SOLVED: To provide a fog observation device and a fog observation method capable of acquiring a highly accurate observation result and a prediction result of fog, by utilizing wide area observability and three-dimensional observability which are characteristics of a meteorological radar device, and by adding also acquired information by a meteorological observation apparatus or the like except the meteorological radar device. SOLUTION: This device is equipped with a characteristic quantity calculation means for calculating plural characteristic quantities for showing the characteristics of meteorological particles in the air based on a reflected wave received by the meteorological radar emitting an electromagnetic wave in the air, a fog determination means for distributing the characteristic quantities calculated by the characteristic quantity calculation means to each type of the meteorological state, and determining whether the fog is generated in the air or not based on the type the meteorological state wherein the distributed characteristic quantities are most concentrated, and a fog generation state classification means for classifying the fog generation state based on the determination result by the fog determination means and the characteristic quantities calculated by the characteristic quantity calculation means.

Fog observation device and fog observation method

Air turbulence has become a major cause of significant injuries and aircraft damages. Timely advanced warning of turbulence ahead of an aircraft may allow pilots to take appropriate action to minimize potential damage, such as reducing speed and securing passengers and unsecured objects, or to avoid the turbulence altogether. The aim of our research is to develop a practical, onboard, Lidar-based proactive sensor that will detect air turbulence in clear air at a range of 5 n miles (9.3 km) at cruising altitudes. In February 2007 we successfully measured wind speeds approximately 3 n miles (5.6 km) ahead of an aircraft in low-altitude flight experiments, and in a subsequent experiment in July of the same year, we succeeded in detecting air turbulence before encountering it. An upgraded 5-n-mile Lidar for low altitudes was developed in fiscal year 2007, and has successfully measured wind speeds at ranges up to 5 n miles in ground tests. This paper describes the master development plan of our Lidar turbulence sensor and the results of basic flight and ground experiments.

Development of an Onboard Doppler Lidar for Flight Safety

Development of an onboard doppler lidar for flight safety

PROBLEM TO BE SOLVED: To determine highly accurate three-dimensional distribution of rainfall intensity in the whole observation range wherein various rain particles are mixed. SOLUTION: A rain particle/rainfall selection determination part determines rainfall or non-rainfall based on correlation ρhv between polarized waves in each mesh at each altitude in the observation range, determines whether each mesh is a shield domain or not based on horizontal polarized wave reflection intensity Zh, an intensity ratio Zdr between polarized waves, a phase difference Kdp between polarized waves, a correlation coefficient ρhv between polarized waves and shield map data relative to a mesh determined to have rainfall, determines rain particles in a mesh corresponding to a determination result of the shield domain, and generates three-dimensional rainfall intensity selection data and rain particle data showing the kind of the rainfall intensity suitable for determined rain particles or a non-rainfall determination result. A rainfall intensity determination part calculates a three-dimensional distribution of the final rainfall intensity in the observation range from four kinds of rainfall intensities based on the rainfall intensity selection data. COPYRIGHT: (C)2009,JPO&INPIT

Weather radar device

We have developed a high-gain, high-peak-power laser amplifier at an eye-safe 1.55 μm wavelength using an Er,Yb:glass planar waveguide for wind sensing coherent Doppler lidars (CDLs). Our planar waveguide is free from stimulated Brillouin scattering and realizes high gain thanks to its multi-bounce optical-path configuration. A peak power of 5.5 kW with a pulse energy of 3.2 mJ is achieved at the repetition frequency of 4 kHz, which leads to an average power of 12.8 W. The gain is more than 23 dB. The wind sensing at more than 30 km is demonstrated with a CDL using the developed amplifier.

Hisamichi Tanaka

Papers

Fog observation device and fog observation method

Development of an Onboard Doppler Lidar for Flight Safety

Development of an onboard doppler lidar for flight safety

Weather radar device

1.55-μm high-peak, high-average-power laser amplifier using an Er,Yb:glass planar waveguide for wind sensing coherent Doppler lidar.