Multilayer Balun Attenuation Pole Tuning via Open Line Conductor
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Solution Overview
Problem
Existing multilayer baluns face difficulties in adjusting the frequency of the attenuation pole without deviating from the desired pass band, as changing inductance or capacitance often affects the pass band characteristics.
Innovation Solution
Incorporating an open line conductor with one end as an open end, which has a smaller inductance component than the first inductor, allowing for adjustment of the attenuation pole frequency while maintaining the pass band by utilizing its higher self-resonant frequency to minimize impact on signal in the pass band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the inductance of the inductor or the capacitance of the capacitor is changed to adjust the attenuation pole frequency, then the attenuation pole frequency can be adjusted, but the pass band may deviate from the desired frequency band
Solution Approach 1:
The patent divides the inductance adjustment function into two separate components: the first inductor (L1) that determines the pass band characteristics, and the second inductor (L2) that adjusts the attenuation pole frequency. By segmenting the inductance elements, each can be optimized independently - L1 maintains the pass band while L2 provides attenuation pole adjustment without affecting the pass band frequency stability.
Solution Approach 2:
The second inductor L2 acts as an intermediary element that mediates between the signal path and ground. It provides a controlled adjustment mechanism for the attenuation pole frequency through magnetic coupling with L1, while its specific design (inductance value, coupling coefficient) ensures that it affects primarily the attenuation pole frequency rather than the pass band center frequency.
2Measurement precision
If the inductance of the first inductor is increased to lower the attenuation pole frequency, then the attenuation pole frequency decreases, but the pass band frequency also shifts
Solution Approach 1:
The patent segments the inductance function into L1 and L2, where L1 is designed with fixed optimal values to ensure pass band frequency accuracy, while L2 provides the adjustment capability for attenuation pole frequency. This segmentation allows independent optimization of each inductor's parameters for its specific function.
Solution Approach 2:
The patent applies local quality by designing L1 and L2 with different inductance values and coupling characteristics suited to their specific roles. L1 has inductance optimized for pass band performance, while L2 has inductance and coupling coefficient optimized for attenuation pole frequency adjustment, allowing each component to have locally optimized properties for its specific function.
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
Enables precise adjustment of the attenuation pole frequency without affecting the pass band, allowing for improved frequency characteristics of the multilayer balun.
Implementation Method 1
The second inductor is electrically connected between the second terminal and the third terminal and is magnetically coupled with the first inductor
Data Source
AI summary
A multilayer balun includes first, second, and third terminals, first and second inductors, and an open line conductor. The first inductor is electrically connected between the first terminal and ground points. The second inductor is electrically connected between the second terminal and the third terminal and is magnetically coupled with the first inductor. The open line conductor has one end that is an open end and another end that is electrically connected to a via conductor pattern, which is a signal path between the first terminal and ground points.