Patent ID: 7369020

Claim:
One transmission line comprising: a substrate comprising a dielectric or semiconductor; one signal conductor which is placed on one surface of the substrate; and a grounding conductor layer which is placed on the other surface of the substrate, wherein the one signal conductor has a plurality of rotational-direction reversal structures each arranged so as to electrically be connected to one another in series from one end-side to the other end-side of the substrate, each of the plurality of the rotational-direction reversal structures comprising: a first signal conductor which is arranged so as to be curved toward a first rotational direction within the one surface of the substrate; and a second signal conductor which is arranged so as to be curved toward a second rotational direction opposite to the first rotational direction within the one surface of the substrate and is placed in the one surface of the substrate so as to be electrically connected in series to the first signal conductor, wherein each of the plurality of the rotational-direction reversal structures has a transmission-direction reversal portion which extends along a direction from the other end-side to the one end-side of the substrate and which includes at least part of the first signal conductor and part of the second signal conductor; and no signal conductor except for the one signal conductor is placed on the one surface of the substrate.