# US 7,612,633 B2 · High-frequency switch

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- Number: US 7,612,633 B2
- Document ID: US7612633B2
- Status: Granted
- Kind: B2
- Application number: 11/748,852
- Filed: 2007-05-15
- Published: 2008-05-08
- Granted: 2009-11-03
- Earliest claimed: 2006-11-07
- Assignees: Mitsubishi Electric Corporation
- Inventors: Masatake Hangai; Yukinobu Tarui; Tamotsu Nishino; Yoshitsugu Yamamoto; Moriyasu Miyazaki; Yoji Isota
- Web page: https://patentgrep.com/patent/US7612633B2

## CPC

- H01P 1/15: by semiconductor devices
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)

## Abstract

The present invention provides a high-frequency switch including: a first switching element connected between a first input/output terminal and a second input/output terminal; a second switching element connected between the second input/output terminal and the first switching element; a high-frequency line provided between the first input/output terminal, the first switching element, and a third input/output terminal; and a third switching element connected between the third input/output terminal, the high-frequency line, and a ground. By connecting the first switching element, the second switching element, the high-frequency line, and the third switching element, because there exists no FET through which a large current flows when a state between the first input/output terminal and the third input/output terminal is set to a transmission state which requires high power handling capability, there is no need to use an FET having a large gate width, which is effective in reducing a loss of the switch.

## Claims

### Claim 1

A high-frequency switch, comprising:
a first input/output terminal;
a first switching element having one end connected to the first input/output terminal;
a second switching element having one end connected to the other end of the first switching element;
a first ground connected to the other end of the second switching element;
a second input/output terminal connected to the other end of the first switching element;
a high-frequency line having one end connected to the first input/output terminal;
a third switching element having one end connected to the other end of the high-frequency line;
a second ground connected to the other end of the third switching element; and
a third input/output terminal connected to the other end of the high-frequency line, wherein
the high-frequency line is formed on a dielectric substrate; and
components other than the high-frequency line are formed on a semiconductor substrate.

### Claim 2 (depends on 1)

A high-frequency switch according to claim 1, wherein:
the first switching element, the second switching element, and the third switching element each comprise a field effect transistor; and
the field effect transistors each have a saturation current set to satisfy the following relationship:
(the third switching element)≧(the first switching element)≧(the second switching element).

### Claim 3 (depends on 1)

A high-frequency switch according to claim 1, wherein the first switching element and the third switching element each have a plurality of switching elements cascade-connected with each other.

### Claim 4 (depends on 1, 2, 3)

A high-frequency switch according to any one of claims 1 to 3, wherein at least one of the first ground and the second ground comprises a series capacitor.

### Claim 5 (depends on 1, 2, 3)

A high-frequency switch according to any one of claims 1 to 3, wherein at least one of the first switching element, the second switching element, and the third switching element comprises a parallel inductor.

### Claim 6 (depends on 1)

A high-frequency switch according to claim 1, wherein:
the high-frequency line has an electric length set to ¼ wavelength of an operating frequency; and
impedance values are set such that impedance of the first input/output terminal, impedance of the third input/output terminal, and impedance of the high-frequency line are set to be equal to each other.

### Claim 7 (depends on 1)

A high-frequency switch according to claim 1, wherein:
the high-frequency line has an electric length set to ¼ wavelength of an operating frequency; and
impedance values are set such that impedance of the third input/output terminal is twice as large as impedance of the first input/output terminal, and impedance of the high-frequency line is √{square root over (2)} times as large as the impedance of the first input/output terminal.

### Claim 8 (depends on 1)

A high-frequency switch according to claim 1, wherein:
the components other than the high-frequency line include the first input/output terminal, the first switching element, the second switching element, the first ground, the second input/output terminal, the third switching element, the second ground, and the third input/output terminal.

### Claim 9 (depends on 1)

A high-frequency switch according to claim 1, wherein:
the high-frequency line formed on the dielectric substrate is loop-shaped.

### Claim 10 (depends on 9)

A high-frequency switch according to claim 9, further comprising:
a first wire that connects the first input/output terminal to the one end of the high-frequency line; and
a second wire that connects the third input/output terminal to the other end of the high-frequency line.

### Claim 11 (depends on 1)

A high-frequency switch according to claim 1, wherein:
the first input/output terminal is directly connected to the one end of the high-frequency line and the one end of the first switching element,
the third input/output terminal is directly connected to the other end of the high-frequency line and the one end of the third switching element, and
the second input/output terminal is directly connected to the other end of the first switching element and to the one end of the second switching element.

### Claim 12

A high-frequency switch, comprising:
a first input/output terminal;
a first switching element having one end connected to the first input/output terminal;
a second switching element having one end connected to the other end of the first switching element;
a first ground connected to the other end of the second switching element;
a second input/output terminal connected to the other end of the first switching element;
only one high-frequency line, the high-frequency line having one end connected to the first input/output terminal;
a third switching element having one end connected to the other end of the high-frequency line;
a second ground connected to the other end of the third switching element; and
a third input/output terminal connected to the other end of the high-frequency line.