Curved Multilayer Coplanar Waveguide for Lower Insertion Loss
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Solution Overview
Problem
Conventional coplanar waveguides experience significant insertion loss at higher frequencies due to parasitic coupling and skin effect losses, primarily caused by current crowding at the sides of the signal conductor.
Innovation Solution
The implementation of stepped multi-layer return conductors and/or signal conductors, which distribute capacitive coupling more evenly across the surface area, reducing current crowding and associated losses by extending conductive layers closer to the central axis with increasing proximity to the reference plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional single-layer coplanar waveguides are used, then the structure is simple and easy to manufacture, but insertion loss increases significantly at higher frequencies due to current crowding and parasitic coupling
Solution Approach 1:
The return conductors are divided into multiple conductive layers stacked vertically, with each layer having a different width. This segmentation allows the current to be distributed across multiple paths and layers, reducing current crowding at the sides of the signal conductor and thereby reducing insertion loss at higher frequencies.
Solution Approach 2:
The patent transitions from a two-dimensional single-layer structure to a three-dimensional multi-layer structure by stacking conductive layers vertically. This adds the vertical dimension to the conductor geometry, enabling better control of current distribution and parasitic coupling without increasing the planar footprint.
2Reliability
If stepped multi-layer conductors are implemented, then current crowding and skin effect losses are reduced, but manufacturing complexity and process difficulty increase
Solution Approach 1:
The patent varies the width parameter of conductive layers at different vertical positions and horizontal positions to optimize performance. By carefully controlling the width of each layer in the stack, the design achieves reduced current crowding and lower parasitic coupling while maintaining manufacturability through standard fabrication processes.
3Object-affected harmful factors
If outer conductors are disposed only in the same layer as the signal conductor, then the waveguide structure is simple and coplanar, but parasitic coupling increases at higher frequencies
Solution Approach 1:
The return conductors are segmented into multiple conductive layers stacked vertically at different positions relative to the signal conductor. This vertical segmentation reduces the parasitic coupling between the signal conductor and the reference plane by distributing the return current across multiple layers, thereby reducing harmful capacitive effects at higher frequencies.
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 approach reduces skin effect losses and parasitic coupling, leading to lower signal loss and lower ohmic resistance, thereby improving the performance of coplanar waveguides at higher frequencies.
Implementation Method 1
distribute capacitive coupling more evenly across the surface area, reducing current crowding and associated losses
Implementation Method 2
reduces skin effect losses and parasitic coupling
Data Source
AI summary
A transmission line includes a signal conductor and one or more return conductors, one or more of which having a stepped multi-layer structure. The return conductors may be disposed at opposite sides of the signal conductor. The return conductors may be multi-layer structures. At least some layers of each return conductor may have a stepped arrangement that defines a curve, such as an exponential curve. Additionally or alternatively, the signal conductor may be a stepped multi-layer structure, where at least some layers of the signal conductor may define a curve, such as an exponential curve. The signal conductor may be disposed at one or more upper layers of the transmission line or may be embedded at one or more layers near the center of the transmission line.