Multilayer Balun Ground Layer Positioning for Wideband Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional multilayer baluns face difficulties in widening their frequency band due to the ground conductor layer, which limits their operational range in modern mobile communication systems, especially with the advent of carrier aggregation techniques that require simultaneous use of multiple frequency bands.
Innovation Solution
The multilayer balun design incorporates a stack of dielectric and conductor layers with a ground conductor layer positioned closer to the second region, where the second conductor layer pairs have the smallest distance, and first conductor layer pairs have the largest distance, allowing for improved electromagnetic coupling and impedance matching across a wider frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a ground conductor layer is used as a shield in conventional multilayer baluns, then electromagnetic shielding is improved, but the frequency band is limited and cannot be widened
Solution Approach 1:
The patent transitions from a conventional planar ground shield to a three-dimensional stacked conductor layer structure. Multiple conductor layers are arranged at different heights (stacking direction) with alternating patterns, creating a spatially distributed shielding system that maintains electromagnetic protection while enabling wider frequency operation through enhanced coupling characteristics.
Solution Approach 2:
The patent implements a nested structure where multiple conductor layers are stacked within the dielectric layers, with each conductor layer pair embedded between dielectric layers. The ground conductor layer is positioned closer to the second region, creating a nested arrangement that optimizes electromagnetic coupling while maintaining shielding effectiveness across extended frequency ranges.
2Reliability
If conductor layers are positioned to optimize electromagnetic coupling, then coupling efficiency is improved, but the structure becomes more complex
Solution Approach 1:
The patent applies different conductor layer configurations to different regions of the stack. The ground conductor layer is positioned closer to the second region rather than being centrally located, creating asymmetric local properties that optimize electromagnetic coupling for specific frequency ranges while maintaining overall structural manageability.
Solution Approach 2:
The patent divides the conductor system into multiple discrete layers with distinct functions: signal conductor layers, ground conductor layers, and return path layers. Each layer pair is separated by dielectric layers, creating segmented functional units that can be independently optimized for coupling efficiency while maintaining a systematic overall structure.
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 the balun to maintain good amplitude and phase balance characteristics over a wider frequency band, specifically from 2.2 to 3.9 GHz, enhancing its operational range and compatibility with advanced mobile communication standards.
Implementation Method 1
a plurality of conductor layer pairs each including two conductor layers adjoining in a stacking direction of the plurality of dielectric layers and the plurality of conductor layers, the two conductor layers being electromagnetically coupled to each other
Data Source
AI summary
A balun includes first to fourth lines and a stack. A plurality of first conductor layers forming the first and third lines are located in a first region in the stack. A plurality of second conductor layers forming the second and fourth lines are located in a second region in the stack. A ground conductor layer is located closer to the second region than to the first region. The plurality of second conductor layers include a conductor layer pair where a distance between two conductor layers is smallest.