Patent ID: 9515632
Filing Date: 2016-12-06
CPC Classification: H01F,H01Q,H03H

Claim Text:
1. An impedance transformation circuit comprising: a transformer including a first coil element and a second coil element that are magnetically coupled and disposed in a stacked element including a plurality of base material layers stacked on each other; a feeder port connected to a first end of the first coil element; an antenna port connected to a second end of the first coil element and a first end of the second coil element; and a ground port connected to a second end of the second coil element; wherein the first coil element includes a first loop-shaped conductor and a second loop-shaped conductor disposed in different layers of the stacked element, respectively; the second coil element includes a third loop-shaped conductor and a fourth loop-shaped conductor disposed in different layers of the stacked element, respectively; the first loop-shaped conductor, the second loop-shaped conductor, the third loop-shaped conductor, and the fourth loop-shaped conductor have a same or substantially a same shape in a top view from a stacking direction; the first loop-shaped conductor and the second loop-shaped conductor are sandwiched in the stacking direction between the third loop-shaped conductor and the fourth loop-shaped conductor; and at least portions of the first loop-shaped conductor and the second loop-shaped conductor are connected in parallel.