In accordance with one or more embodiments, a system includes an impedance matching circuit that includes one or more adjustable circuit elements, wherein the impedance matching circuit receives an input signal and generates an output signal in response to the input signal. A guided wave launcher is configured to generate, in response to the output signal, a first guided electromagnetic wave along a surface of a transmission medium, wherein the first guided electromagnetic wave propagates along the surface of the transmission medium without requiring an electrical return path. A controller is configured to generate one or more control signals in response to a channel quality indicator, wherein the one or more control signals adjust the one or more adjustable circuit elements of the impedance matching circuit, wherein adjustment of the one or more adjustable circuit elements facilitates reducing an impedance mismatch of the guided wave launcher.

Aspects of the subject disclosure may include, for example, a transmission device that includes a first coupler that guides a first electromagnetic wave to a first junction to form a second electromagnetic wave that is guided to propagate along the outer surface of the transmission medium via one or more guided-wave modes. These mode(s) have an envelope that varies as a function of angular deviation and/or longitudinal displacement. Other embodiments are disclosed.

Aspects of the subject disclosure may include, for example, a system for receiving first electromagnetic waves via a transmission medium without utilizing an electrical return path, and inducing second electromagnetic waves at an interface of the transmission medium without the electrical return path. In an embodiment, the first and second electromagnetic waves have a non-optical frequency range. Other embodiments are disclosed.

Provided are methods and systems for terrestrial data transmission between aircrafts and external networks, such as airline and/or airport computer systems. When an aircraft is parked at the gate, the aircraft is connected to and powered by an electrical cable, such as a stinger cable. This cable may be also be used for wired data transmission between the aircraft and the gate using broadband over power line (BPL) technology. The gate and the aircraft are each equipped with a BPL module. The aircraft may include other communication modules, such as a Wi-Fi module, a cellular module, and/or an Ethernet module. These other modules can be also used for data transmission in addition to or instead of communication through the BPL module. A communication link manager may be used to select one or more communication modules depending on availability of communication links, costs, speed, and other parameters.

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 the present disclosure, a communication network includes a surface wave transceiver, mounted on a medium voltage power line, configured to bidirectionally communicate wireless network data via guided electromagnetic waves that propagate along a surface of the medium voltage power line. A plurality of analog surface wave repeater pairs, a plurality of digital surface wave regenerator pairs, are mounted on the medium voltage power line. A plurality of access points, supported by corresponding ones of a plurality of utility poles that also support the medium voltage power line, is configured to wirelessly transmit the wireless network data to a plurality of client devices in accordance with a wireless network protocol and to wirelessly receive client data from the plurality of client devices in accordance with the wireless network protocol. A plurality of surface wave add/drop multiplexer pairs, is also mounted on the medium voltage power line.

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 broadband over powerline (BPL) master control unit is provided. The BPL master control unit includes a processor, a local memory device, a first wireless transceiver, a second wireless transceiver and a powerline transceiver. The processor is configured to transmit and receive data over a power line via the powerline transceiver. The processor is further configured to receive a plurality of data via the powerline transceiver, determine whether to route the plurality of data through the first wireless transceiver or the second wireless transceiver, and transmit the plurality of data via one of the first wireless transceiver and the second wireless transceiver based on the determination.

A broadband over powerline (BPL) master control unit is provided. The BPL master control unit includes a processor, a local memory device, a first wireless transceiver, a second wireless transceiver and a powerline transceiver. The processor is configured to transmit and receive data over a power line via the powerline transceiver. The processor is further configured to receive a plurality of data via the powerline transceiver, determine whether to route the plurality of data through the first wireless transceiver or the second wireless transceiver, and transmit the plurality of data via one of the first wireless transceiver and the second wireless transceiver based on the determination.

A coupling circuit for power line communications includes a coupling transformer having first and second mutually coupled windings, with the first winding connectable to a power line. The second winding includes a pair of intermediate taps with one or more tuning inductor therebetween. The inductor or inductors are set between a first portion and a second portion of the second winding of the coupling transformer. A switch member is provided coupled with the inductor. The switch member is selectively actuatable to short-circuit the inductor.