Laminated Balun Transformer Adjustable Coil Widths
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Solution Overview
Problem
Existing laminated balun transformers have limited versatility due to discrete impedance ratios, making them unsuitable for lines with various impedances, as they cannot accurately match impedance ratios such as 2, 3, or 6, resulting in high insertion loss when used with lines having non-standard impedance ratios.
Innovation Solution
The design incorporates a laminated balun transformer with adjustable coil line widths on magnetic substrates, allowing the impedance ratio of the unbalanced to balanced terminal sides to be set between 1 to 4 or 1 to 6, enabling flexible impedance matching by varying the line width of primary and secondary coils, thus accommodating a range of impedance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional laminated balun transformer is used, then the structure is simple and manufacturing is easy, but it cannot match impedance ratios such as 2, 3, or 6, resulting in high insertion loss
Solution Approach 1:
The patent maintains the simple laminated structure while improving impedance matching accuracy by adjusting the line width parameter of coil patterns. This allows the transformer to achieve precise impedance ratios (1:2, 1:3, 1:6, etc.) without complicating the manufacturing process, thus resolving the contradiction between ease of manufacture and impedance matching accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for low insertion loss and effective impedance matching in lines with various impedances, providing a versatile balun transformer that can handle impedance ratios beyond discrete values like 1, 4, and 9, ensuring optimal performance across different impedance conditions.
Implementation Method 1
a first transformer (5, 8) and a second transformer (6, 9) that are laminated on the first magnetic substrate (1) and face each other
Data Source
AI summary
A laminated balun transformer that may be used for lines having various impedances includes a first magnetic substrate, a laminated body, a second magnetic substrate, and external electrodes. The laminated body includes a first transformer, a second transformer, and an insulator that covers the first and second transformers. The first transformer includes a primary coil and a secondary coil. The second transformer includes a primary coil and a secondary coil. The line width of the primary coil of the first transformer is set so as to decrease from the side of the internal electrode towards the side of the internal electrode. The line width of the secondary coil of the second transformer is also set so as to decrease from the side of the internal electrode towards the side of the internal electrode.