TRANSFORMER HAVING HIGH DEGREE OF COUPLING, ELECTRONIC CIRCUIT, AND ELECTRONIC DEVICE

• US 20120274431A1
• Filed: 07/11/2012
• Published: 11/01/2012
• Est. Priority Date: 01/19/2010
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: KATO, Noboru, ISHIZUKA, Kenichi
• Granted Patent: US 8,754,738 B2
• Time in Patent Office: Days
• US Class Current: 336/182
• CPC Class Codes: H01F 19/04 Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range resonant circuits H03H
• CPC Class Codes: H01F 2027/2809 on stacked layers
• CPC Class Codes: H01P 1/20345 Multilayer filters
• CPC Class Codes: H01P 1/2135 using strip line filters H01P1/2131 takes precedence
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

A transformer having a high degree of coupling is connected between, for example, an antenna element and a power feed circuit. The transformer having a high degree of coupling includes a first inductance element connected to the power feed circuit and a second inductance element coupled to the first inductance element. A first end of the first inductance element is connected to the power feed circuit and a second end of the first inductance element is connected to the antenna element. A first end of the second inductance element is connected to the antenna element and a second end of the second inductance element is grounded.

Claims

1. A transformer comprising:

a first inductance element; and

a second inductance element coupled to the first inductance element;

wherein

the first inductance element is coupled to the second inductance element via a magnetic field and an electric field; and

when alternating current flows through the first inductance element, a direction of current flowing through the second inductance element due to the coupling via the magnetic field coincides with a direction of current flowing through the second inductance element due to the coupling via the electric field.

2. The transformer according to claim 1, wherein, when alternating current flows through the first inductance element, the direction of current flowing through the second inductance element is a direction along which a magnetic barrier occurs between the first inductance element and the second inductance element.

3. The transformer according to claim 1, wherein the first inductance element includes a first coil element and a second coil element, and the first coil element is connected in series to the second coil element and winding patterns of conductors of the first coil element and the second coil element are arranged to define a closed magnetic circuit.

4. The transformer according to claim 1, wherein the second inductance element includes a third coil element and a fourth coil element, and the third coil element is connected in series to the fourth coil element and winding patterns of conductors of the third coil element and the fourth coil element are arranged to define a closed magnetic circuit.

5. The transformer according to claim 1, wherein

the first inductance element includes a first coil element and a second coil element, and the first coil element is connected in series to the second coil element and winding patterns of conductors of the first coil element and the second coil element are arranged to define a closed magnetic circuit;

the second inductance element includes a third coil element and a fourth coil element, and the third coil element is connected in series to the fourth coil element and winding patterns of conductors of the third coil element and the fourth coil element are arranged to define a closed magnetic circuit; and

the first coil element and the third coil element are arranged such that an opening of the first coil element opposes an opening of the third coil element, and the second coil element and the fourth coil element are arranged such that an opening of the second coil element opposes an opening of the fourth coil element.

6. The transformer according to claim 1, wherein the first inductance element and the second inductance element including conductor patterns are arranged in a multilayer body in which a plurality of dielectric or magnetic layers is laminated, and the first inductance element is coupled to the second inductance element in the multilayer body.

7. An electronic circuit comprising:

a transformer including a first inductance element and a second inductance element coupled to the first inductance element;

wherein

the first inductance element is coupled to the second inductance element via a magnetic field and an electric field; and

when alternating current flows through the first inductance element, a direction of current flowing through the second inductance element due to the coupling via the magnetic field coincides with a direction of current flowing through the second inductance element due to the coupling via the electric field;

a primary side circuit connected to the first inductance element; and

a secondary side circuit connected to the second inductance element.

8. An electronic device comprising:

a transformer including a first inductance element and a second inductance element coupled to the first inductance element;

wherein

the first inductance element is coupled to the second inductance element via a magnetic field and an electric field; and

when alternating current flows through the first inductance element, a direction of current flowing through the second inductance element due to the coupling via the magnetic field coincides with a direction of current flowing through the second inductance element due to the coupling via the electric field;

a primary side circuit connected to the first inductance element;

a secondary side circuit connected to the second inductance element; and

a circuit that transfers a signal or power between the primary side circuit and the secondary side circuit via the transformer.