Patent ID: 9660317
Date: 2017-05-23
CPC Classifications: H01P,H03H,H05K

Claim:
1. A high-frequency signal transmission line comprising: a dielectric body including laminated dielectric layers; a linear signal line provided in the dielectric body; and a first grounding conductor that is opposed to the signal line via one of the dielectric layers, the first grounding conductor being of a ladder structure including 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.