Patent ID: 8461943
Filing Date: 2013-06-11
Classification: H01P,H03H,H05K

Abstract:
1. A high-frequency signal transmission line comprising: a dielectric body composed of laminated dielectric layers; a linear signal line provided in the dielectric body; and a first grounding conductor provided in the dielectric body so as to be opposed to the signal line via one of the dielectric layers, the first grounding conductor being of a ladder structure comprising a plurality of openings and a plurality of bridges alternately arranged in an extending direction of the signal line; wherein the signal line has characteristic impedance that changes between two adjacent bridges such that the characteristic impedance rises from a minimum value to a first intermediate value and to a maximum value and falls from the maximum value to a second intermediate value and to the minimum value in this order with increasing distance from one of the adjacent bridges and with decreasing distance from the other adjacent bridge; and the signal line has a smaller width in portions opposed to the bridges than in portions having the maximum value of characteristic impedance.