High-frequency signal line and electronic device

An electronic device comprising:

• a housing;
• and
• a high-frequency signal line accommodated in the housing;
• wherein
• the high-frequency signal line includes:
• an element assembly including a plurality of insulator layers;
• a linear signal line provided in or on the element assembly;
• a first ground conductor provided in or on the element assembly and extending along the signal line;
• and
• a plurality of floating conductors provided in or on the element assembly on one side in a direction of lamination relative to the signal line and the first ground conductor, so as to be arranged along the signal line in an orientation crossing the signal line when viewed in a plan view in the direction of lamination;
• wherein
• the floating conductors are opposite to the signal line and the first ground conductor with at least one of the insulator layers positioned therebetween;
• the floating conductors are connected to neither the signal line nor the first ground conductor;
• and
• a capacitance between the first ground conductor and each of the floating conductors is greater than a capacitance between the signal line and the floating conductor.