Directional Coupler Auxiliary Ground Layer Impedance Control
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Solution Overview
Problem
The existing directional couplers face issues with impedance deviation and deterioration of isolation characteristics due to differences in distances between the main line and ground layers, leading to compromised isolation performance.
Innovation Solution
The directional coupler incorporates an auxiliary ground layer positioned between the main line and sub line, where the distances from the main line to the auxiliary ground layer and from the sub line to the ground layer are different, ensuring a relationship where the auxiliary ground layer distance is greater than or equal to the sub line's distance from the ground layer, thereby reducing impedance deviation and enhancing isolation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the main line and sub line are disposed at different positions between ground layers, then the directional coupler can be constructed with standard layered structure, but impedance deviation occurs and isolation characteristics deteriorate
Solution Approach 1:
An auxiliary ground layer is introduced as an intermediary element between the first and second ground layers. This auxiliary ground layer specifically addresses the non-overlapping regions of the main line and sub line, providing a reference potential that prevents impedance deviation. The auxiliary ground layer acts as a mediator that maintains consistent electromagnetic environment without disrupting the overall layered structure construction.
Solution Approach 2:
The auxiliary ground layer is strategically positioned only in the non-overlapping regions of the main line and sub line, where impedance deviation occurs. By applying the ground reference locally where needed rather than uniformly throughout, the invention maintains impedance consistency in critical areas while preserving the overall layered structure. This local quality approach ensures isolation characteristics are improved without requiring complete structural redesign.
2Reliability
If the auxiliary ground layer is positioned closer to the sub line, then impedance deviation is reduced, but the distance relationship a>c≥b must be maintained
Solution Approach 1:
The invention establishes specific parameter relationships (a>c≥b) that define the optimal positioning of the auxiliary ground layer. By setting clear quantitative constraints on the distances a, b, and c, the design provides a systematic method for achieving impedance consistency. These parameter changes transform the complex positioning problem into a manageable set of geometric relationships that can be implemented during manufacturing.
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 effectively suppresses impedance deviation and improves isolation characteristics by ensuring consistent distances, particularly in non-overlapping regions, thus enhancing the coupler's performance across various frequencies.
Implementation Method 1
a sub line of which at least a part overlaps the main line in a direction in which a plurality of insulator layers are laminated and which is electromagnetically coupled to the main line
Data Source
AI summary
The auxiliary ground layer is a part in which the main line and the sub line do not overlap in the lamination direction and is disposed to face a part in which a distance from the first ground layer and a distance from the second ground layer are different in the lamination direction. When a longer distance is set as a first distance a and a shorter distance is set as a second distance b between a distance between the non-overlapping part and the first ground layer and a distance between the non-overlapping part and the second ground layer, and a third distance between the non-overlapping part and the auxiliary ground layer is set as c, the relationship of a>c.gtoreq.b is satisfied.