# US 2014/0154980 A1 · Smart nfc antenna matching network system and user device including the same

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- Number: US 2014/0154980 A1
- Document ID: US20140154980A1
- Status: Published application
- Kind: A1
- Application number: 14/098,063
- Filed: 2013-12-05
- Published: 2014-06-05
- Earliest claimed: 2012-12-05
- Assignees: Samsung Electronics Co., Ltd.
- Inventors: Yohan JANG; Iljong Song; Hyounghwan Roh
- Web page: https://patentgrep.com/patent/US20140154980A1

## CPC

- H04B 5/70: specially adapted for specific purposes
- H04B 5/263: {Multiple coils at either side}
- H04B 5/77: for interrogation
- H04B: TRANSMISSION

## Abstract

A Near Field Communication (NFC) antenna matching network system is provided for connection with an NFC. The NFC antenna matching network system includes a source coil connected between a first terminal and a second terminal of the NFC transceiver; and a resonant coil physically separated from the source coil.

## Claims

### Claim at position 1

1-35. (canceled)

### Claim 36

A Near Field Communication (NFC) antenna matching network system that is connected with an NFC transceiver, the NFC antenna matching network system comprising:
a source coil connected between a first terminal and a second terminal of the NFC transceiver; and
a resonant coil physically separated from the source coil,
wherein the source coil comprises a capacitor connected in series between both ends of a pattern of the source coil to decrease impedance,
wherein the resonance coil comprises a capacitor connected in parallel between both ends of a pattern of the resonance coil to increase impedance,
wherein the patterns of the source and resonance coils are printed on a film regardless of upper and lower surfaces of the film, and
wherein the source and resonance coils have opposite impedance characteristics.

### Claim 37 (depends on 36)

The NFC antenna matching network system of claim 36, further comprising:
at least one of a first resistor and a first inductor connected in series between the first capacitor and the first end of the source coil; and
at least one of a second resistor and a second inductor connected in series between the second capacitor and the second end of the source coil.

### Claim 38 (depends on 36)

The NFC antenna matching network system of claim 36, further comprising at least one of a first resistor and a first inductor connected in series between the resonant coil and the third capacitor.

### Claim 39 (depends on 36)

The NFC antenna matching network system of claim 36, wherein the resonant coil and the third capacitor constitute a parallel resonator,
wherein the source coil and the first and second capacitors constitute a serial resonator, and
wherein the parallel resonator is physically separated from the serial resonator.

### Claim 40 (depends on 39)

The NFC antenna matching network system of claim 39, wherein the third capacitor comprises a lumped element.

### Claim 41 (depends on 39)

The NFC antenna matching network system of claim 39, wherein the third capacitor comprises parasite capacitance of the resonant coil.

### Claim 42 (depends on 36)

The NFC antenna matching network system of claim 36, further comprising a fourth capacitor connected in parallel with the source coil.

### Claim 43 (depends on 36)

The NFC antenna matching network system of claim 36, further comprising:
a first filter coil connected between the first capacitor and the first terminal; and
a second filter coil connected between the second capacitor and the second terminal.

### Claim 44 (depends on 43)

The NFC antenna matching network system of claim 43, further comprising:
a fourth capacitor connected between a connection node of the first capacitor and the first filter and a reference potential; and
a fifth capacitor connected between a connection node of the second capacitor and the second filter and the reference potential.

### Claim 45 (depends on 36)

The NFC antenna matching network system of claim 36, further comprising:
a first filter coil connected between the source coil and the first capacitor; and
a second filter coil connected between the source coil and the second capacitor.

### Claim 46 (depends on 36)

The NFC antenna matching network system of claim 36, wherein the source coil is formed of a first conductive line having a single-loop or multi-loop shape, and
wherein the resonant coil is formed of a second conductive line having a spiral shape.

### Claim 47 (depends on 46)

The NFC antenna matching network system of claim 46, wherein the first and second conductive lines are formed on a surface of a film, and
wherein the second conductive line surrounds a loop shape of the first conductive line.

### Claim 48 (depends on 46)

The NFC antenna matching network system of claim 46, wherein the first and second conductive lines are formed on a surface of a film,
wherein a first part of the second conductive line surrounds a loop shape of the first conductive line, and
wherein a second part of the second conductive line is within an inner space defined by the loop shape of the first conductive line.

### Claim 49 (depends on 46)

The NFC antenna matching network system of claim 46, wherein the first conductive line is formed on a first surface of a film,
wherein a first part of the second conductive line is formed on a second surface of the film, and
wherein a second part of the second conductive line is formed on the first surface of the film inside of a loop shape of the first conductive line and is connected with the first part of the second conductive line through a via hole penetrating the film.

### Claim 50

A user device, comprising:
a Near Field Communication (NFC) transceiver; and
an NFC antenna matching network system,
wherein the NFC transceiver includes:
a first terminal;
a second terminal; and
a reader that is connected to the first terminal and the second terminal,
wherein the NFC antenna matching network system includes:
a first capacitor having a first end connected with the first terminal;
a second capacitor having a first end connected with the second terminal;
a source coil having connected between a second end of the first capacitor and a second end of the second capacitor; and
a parallel resonator physically separated from the source coil.

### Claim 51 (depends on 50)

The user device of claim 50, wherein the parallel resonator comprises:
a resonant coil; and
a third capacitor connected between a first end and a second end of the resonant coil.

### Claim 52 (depends on 51)

The user device of claim 51, wherein the source coil, the first capacitor, and the second capacitor constitute a serial resonator, and
wherein the parallel resonator is physically separated from the serial resonator.

### Claim 53 (depends on 52)

The user device of claim 52, further comprising a fourth capacitor connected in parallel with the source coil.

### Claim 54 (depends on 51)

The user device of claim 51, further comprising:
a first filter coil connected between the first capacitor and the first terminal; and
a second filter coil connected between the second capacitor and the second terminal.

### Claim 55 (depends on 54)

The user device of claim 54, further comprising:
a fourth capacitor connected between a connection node of the first capacitor and the first filter coil and a reference potential; and
a fifth capacitor connected between a connection node of the second capacitor and the second filter coil and the reference potential.

### Claim 56 (depends on 51)

The user device of claim 51, further comprising:
a first filter coil connected between the source coil and the first capacitor; and
a second filter coil connected between the source coil and the second capacitor.

### Claim 57

A user device, comprising:
a Near Field Communication (NFC) transceiver; and
an NFC antenna matching network system,
wherein the NFC transceiver includes:
a first terminal;
a second terminal;
a reader that is connected with the first terminal and the second terminal; and
a card circuit that is connected with the first terminal and the second terminal, and
wherein the NFC antenna matching network system includes:
a first capacitor having a first end connected with the first terminal;
a second capacitor having a first end connected with the second terminal;
a source coil connected between a second end of the first capacitor and a second end of the second capacitor; and
a parallel resonator physically separated from the source coil,
wherein the parallel resonator includes:
a resonant coil; and
a third capacitor connected between a first end and a second end of the resonant coil.

### Claim 58 (depends on 57)

The user device of claim 57, further comprising:
a first filter coil connected between the first capacitor and the first terminal; and
a second filter coil connected between the second capacitor and the second terminal.

### Claim 59 (depends on 58)

The user device of claim 58, further comprising:
a fourth capacitor connected between a connection node of the first capacitor and the first filter coil and a reference potential; and
a fifth capacitor connected between a connection node of the second capacitor and the second filter coil and the reference potential.

### Claim 60 (depends on 57)

The user device of claim 57, further comprising:
a first filter coil connected between the source coil and the first capacitor; and
a second filter coil connected between the source coil and the second capacitor.

### Claim 61

A user device, comprising:
a Near Field Communication (NFC) transceiver; and
an NFC antenna matching network system,
wherein the NFC transceiver includes:
a first terminal;
a second terminal;
a third terminal;
a fourth terminal;
a reader connected with the first terminal and the second terminal; and
a card circuit connected with the third terminal and the fourth terminal, and
wherein the NFC antenna matching network system includes:
a first capacitor having a first end connected with the first terminal and the third terminal;
a second capacitor having a first end connected with the second terminal and the fourth terminal;
a source coil connected between a second end of the first capacitor and a second end of the second capacitor; and
a parallel resonator physically separated from the source coil,
wherein the parallel resonator includes:
a resonant coil; and
a third capacitor connected between a first end and a second end of the resonant coil.

### Claim 62 (depends on 61)

The user device of claim 61, further comprising:
a first filter coil connected between the first capacitor and the first terminal; and
a second filter coil connected between the second capacitor and the second terminal.

### Claim 63 (depends on 62)

The user device of claim 62, further comprising:
a fourth capacitor connected between a connection node of the first capacitor and the first filter coil and a reference potential; and
a fifth capacitor connected between a connection node of the second capacitor and the second filter coil and the reference potential.

### Claim 64 (depends on 61)

The user device of claim 61, further comprising:
a first filter coil connected between the source coil and the first capacitor; and
a second filter coil connected between the source coil and the second capacitor.

### Claim 65

A user device, comprising:
a Near Field Communication (NFC) transceiver; and
an NFC antenna matching network system,
wherein the NFC transceiver includes:
a first terminal;
a second terminal;
a third terminal;
a fourth terminal;
a fifth terminal;
a reader connected with the first terminal, the second terminal, and the third terminal; and
a card circuit connected with the fourth terminal and the fifth terminal; and
wherein the NFC antenna matching network system includes:
a first capacitor having a first end connected with the first terminal and the fourth terminal;
a second capacitor having a first end connected with the second terminal and the fifth terminal;
a source coil having a first end connected with a second end of the first capacitor, and having a second end connected with a second end of the second capacitor and the third terminal; and
a parallel resonator physically separated from the source coil,
wherein the parallel resonator includes:
a resonant coil; and
a third capacitor connected between a first end and a second end of the resonant coil.

### Claim 66 (depends on 65)

The user device of claim 65, further comprising:
a first filter coil connected between the first capacitor and the first terminal; and
a second filter coil connected between the second capacitor and the second terminal.

### Claim 67 (depends on 66)

The user device of claim 66, further comprising:
a fourth capacitor connected between a connection node of the first capacitor and the first filter coil and a reference potential; and
a fifth capacitor connected between a connection node of the second capacitor and the second filter coil and the reference potential.

### Claim 68 (depends on 65)

The user device of claim 65, further comprising:
a first filter coil connected between the source coil and the first capacitor; and
a second filter coil connected between the source coil and the second capacitor.