29829 results about "Transmission line" patented technology

A low attenuation surface wave transmission line system for launching surface waves on a bare and unconditioned conductor, such as are found in abundance in the power transmission lines of the existing power grids. The conductors within the power grid typically lack dielectric and special conditioning. Accordingly, the present invention includes a first launcher, preferably including a mode converter and an adapter, for receiving an incident wave of electromagnetic energy and propagating a surface wave longitudinally on the power lines. The system includes at least one other launcher, and more likely a number of other launchers, spaced apart from one another along the constellation of transmission lines. The system and associated electric fields along any given conductor are radially and longitudinally symmetrical.

An efficient, low-loss, low sidelobe, high dynamic range phased-array radar antenna system is disclosed that uses metamaterials, which are manmade composite materials having a negative index of refraction, to create a biconcave lens architecture (instead of the aforementioned biconvex lens) for focusing the microwaves transmitted by the antenna. Accordingly, the sidelobes of the antenna are reduced. Attenuation across microstrip transmission lines may be reduced by using low loss transmission lines that are suspended above a ground plane a predetermined distance in a way such they are not in contact with a solid substrate. By suspending the microstrip transmission lines in this manner, dielectric signal loss is reduced significantly, thus resulting in a less-attenuated signal at its destination.

A communication system includes a transmitter including a transmission circuit unit that generates an RF signal for transmitting data and an electric-field-coupling antenna that transmits the RF signal as an electrostatic field, a receiver including an electric-field-coupling antenna and a reception circuit unit that subjects an RF signal received by the electric-field-coupling antenna to reception processing, and a surface-wave propagating means for providing a surface wave transmission line made of a conductor that propagates a surface wave radiated from the electric-field-coupling antenna of the transmitter along a surface of the surface wave transmission line.

An interconnect apparatus for providing a communication path for data signals in a predetermined frequency band, that includes a first and a second sections of a transmission line, connected at one end to first and second data transceiving devices, respectively. A switch, such as a mechanical, electro-mechanical, electronic, electro-magnetic and electro-optical switch, having conductive / non-conductive states, is provided for connecting / disconnecting between the other ends of the first and the second sections, for providing a data communication path between the data transceiving devices while being in its conductive state a third and a fourth sections of a transmission line, each of which connected at one end to a contact of the switch and at the other end to a first and a second connector, respectively. A compensation circuitry is provided for compensating, within the frequency band, parasitic effects caused by the switch and / or cord, while the switch is in its conductive state or, while the switch is in its non-conductive state and while a connection between the first and the second connectors is provided by a cord having predetermined characteristics, such that the compensation circuitry compensates the influence of parasitic effects introduced along the communication path by the switch while being in its non-conductive state and while the cord is a part of the communication path or, by the combination of the third and a fourth sections and the connectors while the switch is in its conductive state.

Provided is a memory system in which a pair of differential signals transmitted via a pair of transmission lines are prevented from being terminated at the same voltage during a standby mode, thereby preventing a receiver from entering an unstable state. The memory system includes a pair of transmission lines, a transmitter that outputs a pair of differential signals to the pair of transmission lines, and a receiver that receives the pair of differential signals via the pair of transmission lines. A first termination voltage is applied to one of the pair of transmission lines, and a second termination voltage is applied to the other transmission line. The first termination voltage is determined to be different from the second termination voltage.