Patent ID: 7345326

Claim:
An electric signal transmission line, comprising: a semiconductor substrate; a signal electrode portion formed over the semiconductor substrate and including a lower conductive semiconductor, an upper conductive semiconductor formed on the lower conductive semiconductor, having a polarity different from that of the lower conductive semiconductor and forming a PN junction in conjunction with the lower conductive semiconductor, and a metal electrode which is formed on the upper conductive semiconductor and through which an electric signal flows; two ground electrode portions provided respectively at opposite sides of the signal electrode portion over the semiconductor substrate and each including a conductive semiconductor having a polarity identical with that of the lower conductive semiconductor and a metal electrode formed on the conductive semiconductor and grounded; a first conductive semiconductor having a polarity identical with that of the conductive semiconductor of the two ground electrode portions, connecting the signal electrode portion and two ground electrode portions to each other and to the semiconductor substrate; a dielectric portion having a dielectric that covers a region between the metal electrode of the signal electrode portion and the metal electrodes of the two ground electrode portions, through which a line of electric force runs and which is a region in which energy of transmitted electric signals exists.