Patent ID: 6946934
Filing Date: 2005-09-20
Classification: H01L,H01P

Abstract:
1. A transmission line comprising: a signal strip; a resistive layer opposed to the signal strip with a dielectric layer disposed between the resistive layer and the signal strip; and a ground conductor electrically connected to the resistive layer, wherein, a high frequency current is induced in the resistive layer through capacitance formed by the dielectric layer between the signal strip and the resistive layer when a high frequency signal of a predetermined frequency is transmitted through the signal strip, and when resistance per unit length generated when the high frequency current flows in the resistive layer, and between the resistive layer and the ground conductor, is defined as an additional resistance, and resistance per unit length generated when the high frequency current flows through the ground conductor is defined as a ground resistance, the additional resistance is larger than the ground resistance, wherein a width of the resistive layer is larger than a width of the signal strip, the resistive layer is formed such that the whole width thereof is opposed to the signal strip, the signal strip is formed on a top face of the dielectric layer, the resistive layer is formed between a substrate and the dielectric layer, the ground conductor is formed on a bottom face of the substrate, and the resistive layer is connected to the ground conductor via a penetrating conductor penetrating the substrate.