Multilayer Directional Coupler Vertical Stacking
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Solution Overview
Problem
Existing directional couplers with horizontal coupling structures face limitations in manufacturing due to separation requirements, restricting mutual capacitance and coupling power.
Innovation Solution
A multilayer directional coupler is developed by stacking substrates with conductive patterns, allowing conductive lines to overlap vertically, reducing the distance between them and enhancing capacitance through the inclusion of capacitors, thereby increasing coupling power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conductive lines are arranged horizontally on the same plane, then manufacturing process is simplified, but mutual capacitance and coupling power are limited due to required separation distance
Solution Approach 1:
The patent transitions from horizontal arrangement on the same plane to vertical stacking across multiple layers. The first conductive pattern is formed on a first substrate, while the second conductive pattern is formed on a second substrate stacked on the first substrate. This vertical arrangement in the third dimension enables the conductive patterns to be closer together, significantly increasing mutual capacitance and coupling power while maintaining manufacturing feasibility through standard multilayer PCB processes.
2Ease of manufacture
If conductive lines are separated by a certain distance, then manufacturing limitations are satisfied, but coupling power is restricted to a certain extent
Solution Approach 1:
By moving the second conductive pattern to a vertically stacked second substrate rather than keeping it on the same plane, the patent reduces the separation distance between conductive patterns. The vertical stacking allows the patterns to be positioned much closer in the Z-direction while maintaining adequate manufacturing clearance, thereby significantly enhancing coupling power without violating manufacturing constraints.
Solution Approach 2:
The patent employs a multilayer composite structure consisting of multiple substrates stacked together with conductive patterns on different layers. This composite construction enables precise control over the distance and orientation between conductive patterns, optimizing both coupling performance and manufacturability through the integration of multiple material layers.
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 allows for higher mutual capacitance and coupling power, overcoming manufacturing limitations and improving performance in wireless communication devices.
Implementation Method 1
a capacitor formed to have a first end connected to the first conductive pattern and a second end connected to the second conductive pattern
Implementation Method 2
a second conductive pattern formed on a second substrate stacked on a surface of the first substrate and formed to have one or more conductive lines overlapping the first conductive pattern when viewed in a plane direction
Data Source
AI summary
There is provided a multilayer directional coupler formed in a wireless communications device formed by stacking a plurality of substrates, comprising a first conductive pattern formed on a first substrate among the plurality of substrates; and a second conductive pattern formed on a second substrate stacked on one surface of the first substrate and having one or more conductive lines overlapping the first conductive pattern when viewed in a plane direction.