# US 10,483,612 B2 · Splitter and electronic device

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- Number: US 10,483,612 B2
- Document ID: US10483612B2
- Status: Granted
- Kind: B2
- Application number: 16/115,765
- Filed: 2018-08-29
- Published: 2019-07-25
- Granted: 2019-11-19
- Earliest claimed: 2018-01-19
- Assignees: Wistron Neweb Corp.
- Applicants: Wistron NeWeb Corp.
- Inventors: Szu-Yuan Chen; Chiung-Wen Hsin
- Web page: https://patentgrep.com/patent/US10483612B2

## CPC

- H01P 5/19: of the junction type
- H01P 5/16: Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H03H 7/00: Multiple-port networks comprising only passive electrical elements as network components
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)
- H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)

## Abstract

A splitter includes a common transmission line, a first transmission line, a second transmission line, a third transmission line, a fourth transmission line, a resistor, and a first reactance circuit. The common transmission line is coupled between a common port and a common node. The first transmission line is coupled between a first port and a first node. The second transmission line is coupled between a second port and a second node. The third transmission line is coupled between the common node and the first node. The fourth transmission line is coupled between the common node and the second node. The resistor is coupled between the first node and the second node. The first reactance circuit is coupled between the first node and the second node. The first reactance circuit includes a first inductor and a first capacitor coupled in parallel, but it does not include any resistor.

## Claims

### Claim 1

A splitter with a common port, a first port, and a second port, comprising:
a common transmission line, coupled between the common port and a common node;
a first transmission line, coupled between the first port and a first node;
a second transmission line, coupled between the second port and a second node;
a third transmission line, coupled between the common node and the first node;
a fourth transmission line, coupled between the common node and the second node;
a resistor, coupled between the first node and the second node; and
a first reactance circuit, coupled between the first node and the second node, wherein the first reactance circuit comprises a first inductor and a first capacitor coupled in series, but the first reactance circuit does not comprise any resistor;
wherein the splitter operates at a central frequency, and the first reactance circuit is configured to reduce isolation between the first port and the second port at the central frequency.

### Claim 2 (depends on 1)

The splitter as claimed in claim 1, wherein the first inductor and the first capacitor are set according to the following equation:
F
⁢
⁢
C
=
1
2
⁢
π
·
1
(
L
⁢
⁢
1
·
C
⁢
⁢
1
)
wherein FC represents the central frequency, π represents a circular constant, L1 represents an inductance of the first inductor, and C1 represents a capacitance of the first capacitor.

### Claim 3 (depends on 1)

The splitter as claimed in claim 1, wherein a length of each of the third transmission line and the fourth transmission line is equal to 0.25 wavelength of the central frequency.

### Claim 4 (depends on 1)

The splitter as claimed in claim 1, wherein each of the common transmission line, the first transmission line, and the second transmission line has a predetermined impedance value.

### Claim 5 (depends on 4)

The splitter as claimed in claim 4, wherein an impedance value of each of the third transmission line and the fourth transmission line is √{square root over (2)}times the predetermined impedance value.

### Claim 6 (depends on 4)

The splitter as claimed in claim 4, wherein a resistance of the resistor is 2times the predetermined impedance value.

### Claim 7 (depends on 1)

The splitter as claimed in claim 1, further comprising:
a second reactance circuit, wherein the second reactance circuit comprises a second inductor and a second capacitor coupled in series, but the second reactance circuit does not comprise any resistor.

### Claim 8 (depends on 7)

The splitter as claimed in claim 7, wherein the second reactance circuit and the first reactance circuit are coupled in series between the first node and the second node.

### Claim 9 (depends on 8)

The splitter as claimed in claim 8, wherein the second reactance circuit is configured to increase isolation between the first port and the second port at other frequencies adjacent to the central frequency.

### Claim 10 (depends on 8)

The splitter as claimed in claim 8, wherein the second inductor and the second capacitor are set according to the following equation:
L2·C2=L1·C1
wherein L2 represents an inductance of the second inductor, C2 represents a capacitance of the second capacitor, L1 represents an inductance of the first inductor, and C1 represents a capacitance of the first capacitor.

### Claim 11 (depends on 8)

The splitter as claimed in claim 8, further comprising:
a third reactance circuit, coupled between the first node and the second node, wherein the third reactance circuit comprises a third inductor and a third capacitor coupled in series, but the third reactance circuit does not comprise any resistor.

### Claim 12 (depends on 11)

The splitter as claimed in claim 11, wherein the third reactance circuit causes the splitter to further operate at an additional frequency, and the third inductor and the third capacitor are set according to the following equation:
F
⁢
⁢
A
=
1
2
⁢
π
·
1
(
L
⁢
⁢
3
·
C
⁢
⁢
3
)
wherein FA represents the additional frequency, π represents a circular constant, L3 represents an inductance of the third inductor, and C3 represents a capacitance of the third capacitor.

### Claim 13 (depends on 7)

The splitter as claimed in claim 7, wherein the second reactance circuit and the first reactance circuit are coupled in parallel between the first node and the second node.

### Claim 14 (depends on 13)

The splitter as claimed in claim 13, wherein the second reactance circuit causes the splitter to further operate at an additional frequency, and the second inductor and the second capacitor are set according to the following equation:
F
⁢
⁢
A
=
1
2
⁢
π
·
1
(
L
⁢
⁢
2
·
C
⁢
⁢
2
)
wherein FA represents the additional frequency, π represents a circular constant, L2 represents an inductance of the second inductor, and C2 represents a capacitance of the second capacitor.

### Claim 15

An electronic device, comprising:
a signal source; and
a splitter, having a common port, a first port, and a second port, wherein the common port is coupled to the signal source, and the splitter comprises:
a common transmission line, coupled between the common port and a common node;
a first transmission line, coupled between the first port and a first node;
a second transmission line, coupled between the second port and a second node;
a third transmission line, coupled between the common node and the first node;
a fourth transmission line, coupled between the common node and the second node;
a resistor, coupled between the first node and the second node; and
a first reactance circuit, coupled between the first node and the second node, wherein the first reactance circuit comprises a first inductor and a first capacitor coupled in series, but the first reactance circuit does not comprise any resistor;
wherein the splitter operates at a central frequency, and the first reactance circuit is configured to reduce isolation between the first port and the second port at the central frequency.

### Claim 16 (depends on 15)

The electronic device as claimed in claim 15, wherein the splitter further comprises:
a second reactance circuit, wherein the second reactance circuit comprises a second inductor and a second capacitor coupled in series, but the second reactance circuit does not comprise any resistor.

### Claim 17 (depends on 16)

The electronic device as claimed in claim 16, wherein the second reactance circuit and the first reactance circuit are coupled in series between the first node and the second node.