Quadrature Coupler Shield Layout for Tunable Coupling
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Solution Overview
Problem
Existing quadrature couplers integrated into multi-functional boards are difficult to modify in terms of coupling degree due to their complex design and internal structure.
Innovation Solution
A quadrature coupler design that utilizes additive manufacturing and printing to adjust the strip conductor widths, allowing for tuning of the coupling degree while maintaining the coupler on a multi-functional board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If prior art quadrature couplers are integrated into a larger board with many functions, then the coupler can be used in complex board environments, but the design such as the degree of coupling becomes not easy alterable
Solution Approach 1:
The patent introduces a movable shield structure that can be adjusted to different positions along the coupling region. This dynamic element allows the coupling degree to be altered after the coupler is integrated into the board, solving the contradiction between adaptability to complex environments and ease of modifying coupling parameters. The shield's position adjustment changes the electromagnetic field distribution, thereby tuning the coupling degree without requiring board redesign.
2Ease of manufacture
If the coupling degree is fixed in prior art designs, then the manufacturing process is simplified, but the ability to tune or adjust the coupling degree is lost
Solution Approach 1:
The movable shield provides a simple mechanical adjustment mechanism that can be implemented during or after manufacturing. This maintains manufacturing simplicity while adding the capability to tune the coupling degree by adjusting the shield position, thus resolving the contradiction between manufacturing simplicity and tuning capability.
Solution Approach 2:
The patent changes the physical parameter of the shield position to control the coupling degree. By moving the shield along the coupling region, the electromagnetic parameters (coupling coefficient) are adjusted without changing the basic structure or materials, maintaining manufacturing simplicity while enabling parameter tuning.
3Reliability
If an electrically conductive shield layer is added over the coupling region, then electrical isolation is improved, but the device complexity increases
Solution Approach 1:
The shield structure serves multiple functions: it provides electrical isolation between the coupling region and surrounding circuits, and simultaneously acts as a tuning element for adjusting the coupling degree by changing its position. This multi-functionality improves reliability through better isolation while minimizing the increase in device complexity, as the same structural element performs both isolation and tuning functions.
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 easy adjustment of the coupling degree between strip conductors, enhancing the flexibility and adaptability of quadrature couplers in complex board environments.
Implementation Method 1
an electrically conductive shield layer disposed over a top surface of the second dielectric layer, extending over opposing sides of the second dielectric layer
Implementation Method 2
quadrature couplers are used in a variety of microwave circuits to split an input signal into a pair of output signals, usually with equal magnitudes, that are ninety degrees apart in phase
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 3A~3C
AI summary
A quadrature coupler having: a pair of overlying strip conductors separated by a first dielectric layer to provide a coupling region between the coupling region of overlying strip conductors; a pair of opposing ground pads, the coupling region being disposed between the pair of opposing ground pads; a second dielectric layer disposed over the coupling region and between the pair of opposing ground pads; and an electrically conductive shield layer disposed over the second dielectric layer, extending over opposing sides of the dielectric layer and onto the pair of opposing ground pads. Portions of coupler are formed by printing or additive manufacturing.