ANTENNA CIRCUIT, COMMUNICATION DEVICE, AND COMMUNICATION METHOD

• US 20130095771A1
• Filed: 09/14/2012
• Published: 04/18/2013
• Est. Priority Date: 10/14/2011
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: BANDO, Hiroshi
• Granted Patent: US 9,893,751 B2
• Time in Patent Office: Days
• US Class Current: 455/73
• CPC Class Codes: H04B 1/0458 Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages matching circuits in general H03H
• CPC Class Codes: H04B 1/18 Input circuits, e.g. for coupling to an antenna or a transmission line coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H

Abstract

An antenna circuit which includes, a resonant circuit which is configured by at least first and second capacitors, and antenna coils; a transmitter-receiver circuit which has a transmission terminal and a reception terminal; and an adjustment circuit which adjusts an impedance between the resonant circuit and the transmitter-receiver circuit, in which a combination of capacitances of the first and second capacitors is set in a predetermined range of a composite capacitance of the first and second capacitors, and a signal from a terminal which is provided between the first and second capacitors is input to the reception terminal.

Claims

1. An antenna circuit comprising:

a resonant circuit which is configured by at least first and second capacitors, and antenna coils;

a transmitter-receiver circuit which has a transmission terminal and a reception terminal; and

an adjustment circuit which adjusts an impedance between the resonant circuit and the transmitter-receiver circuit,

wherein a combination of capacitances of the first and second capacitors is set in a predetermined range of a composite capacitance of the first and second capacitors, and

wherein a signal from a terminal which is provided between the first and second capacitors is input to the reception terminal.

2. The antenna circuit according to claim 1, further comprising:

a communication unit which performs communication in a non-contact manner with a facing communication device;

a storage unit which stores a set value of a combination of capacitances of the first and second capacitors, and information relating to communication properties of the communication device, and the set value; and

a control unit which selects the set value of the combination of capacitances of the first and second capacitors based on the communication properties of the facing communication device which is detected by the communication unit.

3. The antenna circuit according to claim 2,

wherein the control unit sets the capacitances of the first and second capacitors based on the selected set value of the combination of the capacitances.

4. A communication device comprising:

an antenna circuit which includes

a transmitter-receiver circuit having a transmission terminal and a reception terminal;

a resonant circuit which is configured by at least first and second capacitors, and antenna coils; and

an adjustment circuit which adjusts an impedance between the resonant circuit and the transmitter-receiver circuit,

wherein a combination of capacitances of the first and second capacitors is set in a predetermined range of a composite capacitance of the first and second capacitors, and

wherein a signal from a terminal which is provided between the first and second capacitors is input to the reception terminal.

5. The communication device according to claim 4,

wherein the antenna circuit further includes,

a communication unit which performs communication in a non-contact manner with a facing communication device;

a storage unit which stores a set value of a combination of capacitances of the first and second capacitors, and information relating to communication properties of the communication device, and the set value; and

a control unit which selects the set value of the combination of capacitances of the first and second capacitors based on the communication properties of the facing communication device which is detected by the communication unit.

6. The communication device according to claim 5,

wherein the control unit sets capacitances of the first and second capacitors based on the selected set value of the combination of the capacitances.

7. A communication method using an antenna circuit which includes

a transmitter-receiver circuit including a transmission terminal and a reception terminal;

a resonant circuit which is configured by at least first and second capacitors, and antenna coils; and

an adjustment circuit which adjusts an impedance between the resonant circuit and the transmitter-receiver circuit,

the method comprising;

setting a combination of capacitances of a first and second capacitors in a predetermined range of a composite capacitance of the first and second capacitors; and

inputting a signal from a terminal which is provided between the first and second capacitors to the reception terminal.