Impedance transformation circuit and wireless communication apparatus

摘要

A first coil element includes a first loop-shaped conductor and a second loop-shaped conductor. A second coil element includes a third loop-shaped conductor and a fourth loop-shaped conductor. The first loop-shaped conductor and the second loop-shaped conductor are sandwiched in a stacking direction between the third loop-shaped conductor and the fourth loop-shaped conductor. A conductive pattern which is a portion of the first loop-shaped conductor and a conductive pattern which is a portion of the second loop-shaped conductor are connected in parallel. Then, each of a conductive pattern which is a remaining portion of the first loop-shaped conductor and a conductive pattern which is a remaining portion of the second loop-shaped conductor is connected in series with the parallel circuit.

主权项

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.