Patent ID: 6922135

Claim:
A communications apparatus for communicating multiplexed electric signals through one or more electric lines having a characteristic impedance, comprising: a plurality of modulators to modulate the electric signals to produce multiple modulated carrier signals, each having a pre-selected frequency of about 200 MHz or greater; one or more transmitters, each having an output impedance, operatively connected to each modulator for transmitting the modulated carrier signals; a coupler for connection between the electric line and each transmitter, said coupler matching the output impedance of the transmitter to the characteristic impedance of the electric line and communicating modulated carrier signals to the electric line without significant phase distortion; each coupler comprising: a transformer having a non-magnetic core; and a coupling capacitor that resonates with the transformer at the pre-selected frequency; said transformer comprising: a first conductive plate; and a second conductive plate spaced from the first conductive plate by the non-magnetic core; the capacitor being adapted to be connected between the first conductive plate and the electric line, wherein the impedance of the first conductive plate and the capacitor are matched to the characteristic impedance of the electric line at a pre-selected bandwidth; and a frequency division multiplexer for combining the electric signals.