Aspects of the subject disclosure may include, for example, a coupling device includes a circuit that receives a signal. At least one passive electrical circuit element generates an electromagnetic field in response to the signal. A portion of the electromagnetic field is guided by a surface of a transmission medium to propagate as a guided electromagnetic wave longitudinally along the transmission medium. Other embodiments are disclosed.

In accordance with one or more embodiments, a MIMO transceiver generates first electromagnetic signals convey first data in accordance with one or more MIMO techniques. The MIMO transceiver generates, responsive to the first electromagnetic signals, first electromagnetic waves on a plurality of transmission lines, wherein the first electromagnetic waves are guided by a plurality of surfaces of the plurality of transmission lines, wherein the first electromagnetic waves propagate along the plurality of transmission lines without requiring an electrical return path, wherein the first electromagnetic waves convey the first data.

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.

Aspects of the subject disclosure may include, for example, a network termination includes a downstream channel modulator modulates downstream data into downstream channel signals to convey the downstream data via a guided electromagnetic wave that is bound to a transmission medium of a guided wave communication system. A host interface sends the downstream channel signals to the guided wave communication system and receives upstream channel signals corresponding to upstream frequency channels from the guided wave communication system. An upstream channel demodulator demodulates upstream channel signals into upstream data. Other embodiments are disclosed.

Aspects of the subject disclosure may include a generator that facilitates generation of an electromagnetic wave, a core, and a waveguide that facilitates guiding the electromagnetic wave towards the core to induce a second electromagnetic wave that propagates along the core. The core and/or the waveguide can be configured to reduce radiation loss of the second electromagnetic wave, propagation loss of the second electromagnetic wave, or a combination thereof. Other embodiments are disclosed.

Aspects of the subject disclosure may include, for example, a coupling device includes a circuit that receives a signal. At least one passive electrical circuit element generates an electromagnetic field in response to the signal. A portion of the electromagnetic field is guided by a surface of a transmission medium to propagate as a guided electromagnetic wave longitudinally along the transmission medium. Other embodiments are disclosed.

In accordance with one or more embodiments, a system can include a plurality of twisted insulated conductors, and a communication device coupled to a first conductive endpoint of each insulated conductor of the plurality of twisted insulated conductors. The communication device can facilitate generating transmission signals at each first conductive endpoint of each insulated conductor of the plurality of twisted insulated conductors. The transmission signals in turn can induce electromagnetic waves that propagate along interstitial areas between the plurality of twisted insulated conductors. Other embodiments are disclosed.

In accordance with one or more embodiments, a MIMO transceiver generates first electromagnetic signals convey first data in accordance with one or more MIMO techniques. The MIMO transceiver generates, responsive to the first electromagnetic signals, first electromagnetic waves on a plurality of transmission lines, wherein the first electromagnetic waves are guided by a plurality of surfaces of the plurality of transmission lines, wherein the first electromagnetic waves propagate along the plurality of transmission lines without requiring an electrical return path, wherein the first electromagnetic waves convey the first data.

An in-cabin communication system performs wireless communication between a vehicle and a portable terminal carried by an occupant. The in-cabin communication system includes: a vehicular device mounted to the vehicle; and a leaky coaxial cable that is connected to the vehicular device, and that outputs an electromagnetic wave having a predetermined wavelength according to a command from the vehicular device. The leaky coaxial cable is disposed inside a steel plate of a body of the vehicle. The leaky coaxial cable is disposed at a predetermined distance, which corresponds to an integer multiple of a half-wavelength of the predetermined wavelength, from the steel plate.

In accordance with one or more embodiments, a system can include a plurality of cables, wherein each cable of the plurality of cables includes an insulation layer comprising a helix structure. The helix structure of each cable of the plurality of cables can facilitate formation of a plurality of interstitial pathways between the plurality of cables. The system can further include communication device coupled to the plurality of cables, where the communication device facilitates generating electromagnetic waves that propagate along the plurality of interstitial pathways without requiring an electrical return path. Other embodiments are disclosed.