Multi-Band LC Balun Without Switch and Terminal Complexity
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Solution Overview
Problem
Multi-band baluns are typically large in size due to the need for switches to connect multiple single-band baluns, which increases the number of terminals and complexity.
Innovation Solution
The use of LC parallel resonators with different resonant frequencies, magnetically coupled to each other, allows for the conversion between balanced and unbalanced signals across multiple frequency bands without the need for a switch, reducing the size and complexity of the balun.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple single-band baluns are combined with a switch to form a multi-band balun, then the balun can operate across multiple frequency bands, but the size and complexity increase due to the switch and additional terminals
Solution Approach 1:
The patent applies universality by designing a single balun structure that can operate across multiple frequency bands without requiring a switch. The balun achieves multi-band functionality through its resonant circuit configuration, where the same physical structure serves different frequency bands by utilizing different resonant modes of the LC resonators, eliminating the need for switching mechanisms.
Solution Approach 2:
The patent merges multiple single-band balun functions into a single integrated structure. Instead of combining separate baluns with a switch, the invention integrates multi-band operation into one unified balun design using magnetically coupled LC resonators, thereby reducing the overall device complexity and eliminating the need for external switching components.
2Adaptability or versatility
If a 2n-pole double-throw switch is used to connect 2n terminals for balanced signals across n frequency bands, then all frequency bands can be accessed, but the device size becomes large
Solution Approach 1:
The patent eliminates the need for a large 2n-pole switch by designing a universal balun structure that handles multiple frequency bands simultaneously. The magnetically coupled LC resonators are configured to support multiple resonant frequencies, allowing the same physical structure to serve multiple frequency bands without requiring additional switching hardware or increasing device volume.
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 enables efficient conversion between balanced and unbalanced signals across multiple frequency bands while minimizing the balun's size, eliminating the need for switches and associated complexity.
Implementation Method 1
The second LC resonator is magnetically coupled with the first LC resonator and electrically connected between the third terminal and the fourth terminal
Implementation Method 2
The fourth LC resonator is magnetically coupled with the third LC resonator and electrically connected between the third terminal and the fourth terminal in parallel with the second LC resonator
Implementation Method 3
Each of the first LC resonator and the second LC resonator has a resonant frequency that is a first resonant frequency. Each of the third LC resonator and the fourth LC resonator has a resonant frequency that is a second resonant frequency higher than the first resonant frequency
Data Source
AI summary
A balun includes a first LC resonator, a second LC resonator, a third LC resonator, and a fourth LC resonator. The second LC resonator is magnetically coupled with the first LC resonator. The fourth LC resonator is magnetically coupled with the third LC resonator and electrically connected between a third terminal and a fourth terminal in parallel with the second LC resonator. Each of the first LC resonator and the second LC resonator has a resonant frequency that is a first resonant frequency. Each of the third LC resonator and the fourth LC resonator has a resonant frequency that is a second resonant frequency higher than the first resonant frequency.