Millimeter Wave Electrical Element Design Using Spiraled Metal Lines
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Solution Overview
Problem
Conventional millimeter wave electrical elements, such as phase shifters and hybrids, are too large for integration into small portable devices like smartphones and netbook computers, due to limitations in size and design constraints, which degrades their efficiency and performance.
Innovation Solution
A method for designing compact millimeter wave electrical elements involves computing the length and number of turns for metal lines, determining their width and spacing, and winding them on a multilayer substrate to create a spiraled structure that achieves strong self-inductance and capacitance, allowing for efficient coupling without the need for specific inductors and capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coupled transmission lines structure is used, then coupling function is achieved, but the size of the electrical element becomes too large for integration into portable devices
Solution Approach 1:
The patent transitions from planar transmission lines to three-dimensional spiraled metal lines wound around a core structure. This dimensional change allows the coupling function to be achieved in a compact volume, reducing the area occupied on the substrate while maintaining the required electrical coupling between signal paths.
Solution Approach 2:
The patent implements nested spiraled metal lines where multiple conductive paths are wound around a common core structure. The inner and outer spiraled lines are coupled through the core, creating a compact nested configuration that achieves the coupling function in a reduced space compared to conventional planar structures.
2Area of stationary object
If transmission line length is reduced to decrease size, then area is reduced, but coupling efficiency and performance are degraded
Solution Approach 1:
The patent changes the geometric parameters of the metal lines by winding them in spiral configurations around a core. This transformation allows the effective electrical length to be extended within a compact physical footprint, maintaining coupling efficiency while reducing the overall area occupied on the substrate.
Solution Approach 2:
The patent employs curved spiraled paths for the metal lines instead of straight planar transmission lines. The curved geometry increases the effective electrical length within a compact area, allowing adequate coupling length to be achieved without proportionally increasing the occupied space.
3Reliability
If lumped element LC network is used to achieve coupling, then coupling function is achieved, but the area increases and gain losses increase
Solution Approach 1:
The patent merges the functions of separate inductors and capacitors into a single integrated structure formed by the spiraled metal lines and their coupling through the core. This unified configuration eliminates the need for discrete lumped elements, reducing the total area and minimizing gain losses associated with multiple separate components.
Solution Approach 2:
The patent replaces the mechanical lumped element LC network with a distributed electromagnetic structure formed by the spiraled transmission lines. This substitution eliminates the need for physical inductor and capacitor components, reducing area and improving gain characteristics through the distributed nature of the coupling structure.
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 results in compact, high-performance millimeter wave electrical elements with strong coupling properties, reduced size, and low return path losses, suitable for integration in devices like smartphones and netbook computers operating in the 60 GHz band.
Implementation Method 1
winding the first metal line on a first metal layer according to the first number of turns and winding the second metal line on the first metal layer and, in part, on a second metal layer according to the second number of turn, thereby resulting in a spiraled structure
Implementation Method 2
computing a length of a first metal line and a second metal line; computing a first number of turns for the first metal line and a second number of turns for the second metal line, wherein the length and number of turns of each of the first metal line and the second metal line are computed to meet radio-frequency (RF) properties
Data Source
AI summary
A method for designing a coupling-function based millimeter wave electrical element. The method comprises computing a length of a first metal line and a second metal line; computing a first number of turns for the first metal line and a second number of turns for the second metal line; determining a width value of each of the first metal line and the second metal line; determining a spacing value between the first metal line and the second metal line; winding the first metal line on a first metal layer according to the first number of turns and winding the second metal line on the first metal layer and, in part, on a second metal layer according to the second number of turns, thereby resulting in a spiraled structure; and setting ports for the spiraled structure to form a complete design of the millimeter wave electrical element.