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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

Inactive Publication Date: 2004-03-31
SAMSUNG ELECTRO MECHANICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The above-mentioned balun 40 is structurally simpler than the 4-wire balun, but has the disadvantage that the branch point 44a must be formed in the unbalanced port 44, causing unnecessary reflection of high-frequency signals

Method used

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Embodiment Construction

[0037] Figure 5 is an equivalent circuit diagram of the 3-wire balun of the present invention, which is indicated by reference numeral 50 . As shown in the figure, the balun 50 includes first to third lines 51 to 53 each having first and second ends. The first to third wires 51 to 53 are arranged to be electromagnetically coupled to each other. A first end of the first line 51 is connected to an unbalanced port 54 for inputting or outputting an unbalanced signal, and a second end thereof is grounded. First ends of the second line 52 and the third line 53 are connected to each other and their second ends are respectively connected to first and second balanced ports 55 for respectively outputting or inputting signals of the same level and 180 degrees out of phase with each other and 56.

[0038] The first to third wires 51 to 53 are arranged in parallel to generate mutual electromagnetic coupling. That is, the first to third lines 51 to 53 form an inter-line coupler.

[00...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F19/06H01P5/10
CPCH01P5/10
Inventor 朴东锡金南澈尹贞皓李炳华朴祥秀
Owner SAMSUNG ELECTRO MECHANICS CO LTD
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