| 摘要 |
<p>This invention provides improvements in electrical transmission of digital and analog information and of electric power through cables of coaxial, twisted pair, and other types such as used for telephone local loop, local area networks (LAN), Cable Television, and other applications. The present invention describes methods for improving the electrical characteristics of such cables to allow reduced attenuation over longer distance and higher transmission rates. These improvements are achieved through neutralization of the longitudinal (series) inductance (110) of the cable through the addition of capacitors (300, 131) and inductors (400) selected to achieve resonance at the exact transmission frequency. Simultaneous transmission of signals at more than one resonant frequency is possible according to the present invention. Further improvement in transmission, which is applicable to the applications mentioned above as well as to transmission of electric power, involves neutralization of the leakage (shunt) capitance (130) through the addition of parallel inductor (400), or preferably a plurality of inductors, selected to produce resonance together with the intrinsic leakage or shunt capacitance of the cable.</p> |
