3-line balun transformer

A balun, balanced technology, applied in the directions of broadband transformers, waveguide devices, electrical components, etc., can solve problems such as high-frequency signal reflection, and achieve the effect of simplifying the design and reducing the number of
CN1485947AInactive Publication Date: 2004-03-31SAMSUNG ELECTRO MECHANICS CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SAMSUNG ELECTRO MECHANICS CO LTD
Publication Date
2004-03-31
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

A 3-line balun transformer which has a simple structure and is easy to design and manufacture. The balun transformer comprises an unbalanced port for inputting or outputting an unbalanced signal, first and second balanced ports for outputting or inputting balanced signals, respectively, the balanced signals being the same in level and 180 degrees out of phase with each other, a first line having its first end connected to the unbalanced port and its second end connected to ground, a second line arranged in parallel with the first line while being spaced apart from the first line by a predetermined distance, the second line having its first end and its second end connected to the first balanced port, and a third line arranged in parallel with the second line while being spaced apart from the second line by a predetermined distance, the third line having its first end connected to the first end of the second line and its second end connected to the second balanced port.
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Description

technical field

[0001] The present invention relates to a balun for converting a balanced signal into an unbalanced signal or vice versa, and more particularly to a 3-wire balun having a simple structure and being easy to design and manufacture. Background technique

[0002] Often, "balanced-unbalanced" is an abbreviation for "balanced-to-unbalanced" and generally denotes a circuit or structure for converting a balanced signal to an unbalanced signal or vice versa.

[0003] For example, a balun may be required in the field of wireless communications to connect mixers, amplifiers, etc. that include balanced lines with components that include unbalanced lines.

[0004] The balun can be realized with a combination of transmission lines or lumped constant circuits, or in the case of its application to the field of antennas, in the form of a resonant waveguide.

[0005] figure 1 is the equivalent circuit diagram of the traditional balun proposed by Marchand. As shown in this f...

Claims

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