Compact Balun Design Using Ground Part Potential Difference
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Solution Overview
Problem
Conventional baluns have a size limitation due to the requirement for output lines to be approximately ¼ of the input wavelength, restricting further reduction in overall size while maintaining a 180° phase difference between output signals.
Innovation Solution
The balun design includes a substrate with signal lines and a ground part patterned to create a potential difference between output signal paths, allowing for reduced output line lengths while maintaining a 180° phase difference through the use of capacitors and dielectric layers to adjust capacitance and inductance, enabling a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If output lines are made approximately ¼ of the input wavelength to maintain 180° phase difference, then phase balance is improved, but the overall size of the balun increases
Solution Approach 1:
The patent changes the electrical parameters (capacitance and inductance) of the ground part by patterning it with specific geometric configurations. This allows the output lines to be shorter than ¼ wavelength while still achieving the required 180° phase difference, thus reducing the overall balun size while maintaining phase balance
Solution Approach 2:
The ground part is designed with a specific patterned geometry that creates distributed capacitance and inductance effects. By utilizing the spatial arrangement and dimensional configuration of the ground part, the patent achieves the desired phase transformation in a more compact footprint
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 design allows for a reduced overall size of the balun while maintaining the necessary phase difference between output signals, enhancing compactness without compromising performance.
Implementation Method 1
a potential difference occurs between a path of the second signal line through which the first output signal is transmitted and a path of the second signal line through which the second output signal is transmitted
Implementation Method 2
The first dielectric may be interposed between the first and second signal lines and the ground part
Data Source
AI summary
A balun capable of a reduced whole size. The balun includes an input line receiving an unbalanced signal, an output line receiving the unbalanced signal from the input line and outputting a balanced signal, and a ground part. The input and output lines are formed on a layer, and the ground part is formed on a different layer from the layer. The ground part includes an opening and is electrically connected to the input line, and a portion of the ground part is removed to form the opening so that a potential difference occurs between first and second output lines. Thus, although a length of the output line is less than ¼ of an input wavelength λ, a difference between phases of first and second output signals can be about 180°. As a result, the whole size of the balun can be reduced.