Magnetic resonance imaging device, power amplifier module and power combiner

Patent metadata

Field	Value
Publication number	US-10833387-B2
Application number	US-201615567011-A
Country	US
Kind code	B2
Filing date	Apr 5, 2016
Priority date	Apr 16, 2015
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

A power combiner comprises a first transmission line or lumped circuit element, a second transmission line or lumped circuit element, a third transmission line or lumped circuit element, a fourth transmission line or lumped circuit element and a balance capacitive element (Cbal) or balance inductive element (Lbal). The first transmission line or lumped circuit element is coupled to a first port. The second transmission line or lumped circuit element is coupled between the first transmission line or lumped circuit element and a common port. The third transmission line or lumped circuit element is coupled to a second port. The fourth transmission line or lumped circuit element is coupled between the third transmission line or lumped circuit element and the common port. The balance capacitive element (Cbal) or the balance inductive element (Lbal) is coupled between a connection point between the first transmission line or lumped circuit element and the second transmission line or lumped circuit element and a connection point between the third transmission line or lumped circuit element and the fourth transmission line or lumped circuit element. Further provided are a power amplifier module and a magnetic resonance imaging device.

First claim

What is claimed is:

1. A power combiner, comprising:
a first transmission line or lumped circuit element electrically connected to a first port;
a second transmission line or lumped circuit element electrically connected between the first transmission line or lumped circuit element and a common port, wherein a first connection point is located between i) the first transmission line or lumped circuit element and ii) the second transmission line or lumped circuit element;
a third transmission line or lumped circuit element electrically connected to a second port;
a fourth transmission line or lumped circuit element electrically connected between the third transmission line or lumped circuit element and the common port, wherein a second connection point is located between i) the third transmission line or lumped circuit element and ii) the forth transmission line or lumped circuit element; and
a balance capacitive element or balance inductive element including a first end and a second end, wherein the first end is electrically connected to the first connection point, and the second end is electrically connected to the second connection point,
wherein (i) an odd-mode input impedance of the first port is zero and (ii) an odd-mode input impedance of the second port is zero, such that a voltage at the first port is equal to a voltage at the second port when a current flowing through the first port and a current flowing through the second port are unbalanced.

2. The power combiner of claim 1 , wherein each of the first lumped circuit element, the second lumped circuit element, the third lumped circuit element, and the fourth lumped circuit element comprises one of a capacitive element and an inductive element.

3. The power combiner of claim 1 , wherein
the first transmission line is electrically connected to the first port;
the second transmission line is electrically connected between the first transmission line and the common port;
the third transmission line is electrically connected to the second port;
the fourth transmission line is electrically connected between the third transmission line and the common port;
the balance capacitive element or the balance inductive element electrically connected between the first connection point between the first and second transmission lines and the second connection point between the third and fourth transmission lines.

4. The power combiner of claim 3 , wherein an odd-mode input impedance of the second transmission line is calculated by the following equation 1:

Z

odd
⁢

⁢
1
⁢

⁢
_
⁢

⁢
b

=

Z

o
⁢

⁢
1

⁢

j
⁢

⁢

Z

o
⁢

⁢
1

⁢
tan
⁢

⁢
β
⁢

⁢
l

Z

o
⁢

⁢
1

=

j
⁢

⁢

Z

o
⁢

⁢
1

⁢
tan
⁢

⁢
β
⁢

⁢
l

equation
⁢

⁢
1

where βl is an electrical length of the second transmission line, Z o1 is a characteristic impedance of the second transmission line;
wherein an odd-mode output impedance of the first transmission line is calculated by the following equation 2:

Z

odd
⁢

⁢
1
⁢

⁢
_
⁢

⁢
c

=

-

1

Assignees

• Ge Prec Healthcare Llc

Inventors

• Chen Jifeng
• Song Tingting

Classifications

• G01R33/3614

  RF power amplifiers · CPC title

• H01P5/16 Primary

  Conjugate devices, i.e. devices having at least one port decoupled from one other port · CPC title