Directional Coupler Layout for Stable Coupling on Thin Substrates
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Solution Overview
Problem
Existing directional couplers require a thick substrate to adjust impedance and minimize variation in coupling, which is not feasible without increasing the substrate thickness.
Innovation Solution
A directional coupler design that includes a substrate with multiple dielectric layers, where the main line and sub-lines are electromagnetically coupled, allowing impedance adjustment without increasing the substrate thickness by optimizing the arrangement and width of conductor lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick substrate is used to adjust impedance and minimize coupling variation, then impedance control and coupling stability are improved, but substrate thickness increases
Solution Approach 1:
The patent transitions from adjusting impedance through substrate thickness (one-dimensional approach) to adjusting impedance through conductor line width and arrangement (two-dimensional approach). By arranging conductor lines at different positions and widths on the substrate surface, the invention achieves impedance control without increasing substrate thickness, thus resolving the contradiction between coupling stability and substrate thickness.
Solution Approach 2:
The patent applies different local configurations to different conductor lines - specifically, the first conductor line has a different width than the second conductor line, and they are positioned at different locations relative to the third conductor line. This local differentiation allows precise impedance control for each line, enabling coupling stability without requiring increased substrate thickness.
2Reliability
If conductor lines are arranged to minimize coupling variation, then coupling stability is improved, but impedance adjustment becomes more difficult
Solution Approach 1:
The patent changes the parameters of conductor lines - specifically their widths and positions - to achieve both coupling stability and impedance adjustment. By varying the width of the first and second conductor lines and their relative positions to the third conductor line, the invention simultaneously optimizes coupling stability while maintaining impedance control capability, avoiding increased device complexity.
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 minimizes variation in coupling without requiring a thicker substrate, ensuring stable operation and reduced power loss by maintaining close proximity of conductor lines while maintaining impedance adjustment capabilities.
Implementation Method 1
The first conductor line and the second conductor line are able to be electromagnetically coupled to the third conductor line
Data Source
AI summary
A directional coupler includes a substrate, a main line, a first sub-line, and a ground conductor. The main line includes a first conductor line and a second conductor line electrically connected to each other. The first sub-line includes a third conductor line. The first conductor line and the second conductor line are able to be electromagnetically coupled to the third conductor line. The first conductor line has a first edge and a second edge. The second conductor line has a third edge and a fourth edge. The third conductor line has a fifth edge and a sixth edge. The first conductor line, the second conductor line, and the third conductor line are arranged in such a manner that the first edge, the fifth edge, the third edge, the second edge, the sixth edge, and the fourth edge are arranged in this order when the substrate is viewed in plan.