Common mode choke coil and high-frequency electronic device

A common mode choke coil comprising:

• a primary coil;
• and
• a secondary coil;
• wherein
• the primary coil includes a first coil pattern and a second coil pattern connected in series to the first coil pattern;
• the secondary coil includes a third coil pattern and a fourth coil pattern connected in series to the third coil pattern;
• the first coil pattern and the third coil pattern are concentrically wound, as parallel or substantially parallel lines, in loop shapes on one surface;
• the second coil pattern and the fourth coil pattern are concentrically wound, as parallel or substantially parallel lines, in loop shapes on the one surface with being adjacent to the first coil pattern and the third coil pattern;
• the first coil pattern, the second coil pattern, the third coil pattern, and the fourth coil pattern are stacked coils defined by interlayer-connecting coil patterns individually provided on a plurality of base material layers;
• the first coil pattern and the second coil pattern are connected in series on an uppermost layer of the base material layers, and the third coil pattern and the fourth coil pattern are connected in series on the uppermost layer of the base material layers;
• and
• an end portion of each of the primary coil and the secondary coil is connected to an input-output electrode arranged only on a mounting surface defining a lowermost layer of the base material layers.