Microstrip-to-Waveguide Transition for High-Bandwidth Chip Interconnects
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Solution Overview
Problem
Conductor-based interconnects face limitations in channel bandwidth due to the skin effect, while optic-based interconnects are costly and inefficient for chip-to-chip communication, necessitating a solution that balances cost, power efficiency, and high-speed data transmission.
Innovation Solution
A microstrip circuit with a feeding line, probe, and patch emitting signals to a waveguide, where the length of the probe, thickness of the core substrate, and permittivity are optimized to increase bandwidth, coupled with a waveguide having dielectric and metal parts of varying permittivity, to enhance signal transition efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conductor-based interconnects are used, then cost and power efficiency are improved, but channel bandwidth is limited due to skin effect
Solution Approach 1:
The patent replaces traditional conductor-based interconnects with a waveguide structure that uses electromagnetic wave propagation instead of current flow. This substitution eliminates the skin effect limitation by transitioning from electrical conduction to electromagnetic wave guidance, thereby increasing channel bandwidth while maintaining cost and power efficiency through the use of standard PCB materials and manufacturing processes
Solution Approach 2:
The patent changes the fundamental operating parameter from electrical current flow to electromagnetic wave propagation. By designing the waveguide with specific dimensions and dielectric properties, the system operates in a regime where electromagnetic waves can propagate with minimal loss, overcoming the bandwidth limitations of conductor-based interconnects while maintaining compatibility with existing manufacturing techniques
2Speed
If optic-based interconnects are used, then data transmission speed is improved, but installation and maintenance costs increase significantly
Solution Approach 1:
The patent changes the operating wavelength from optical frequencies to microwave/mmWave frequencies, which can be transmitted through standard PCB waveguides using existing manufacturing processes. This parameter change enables high-speed data transmission comparable to optical interconnects while dramatically reducing installation and maintenance costs by eliminating the need for specialized optical components and expertise
Solution Approach 2:
The patent employs standard PCB materials and conventional manufacturing techniques to create the waveguide structure, replacing expensive optical components with cost-effective microwave-frequency transmission structures. This approach enables high-speed communication while keeping installation and maintenance costs low through the use of readily available materials and standard fabrication processes
3Productivity
If transition bandwidth between microstrip circuit and waveguide is increased, then data communication speed is improved, but component size may increase
Solution Approach 1:
The patent employs a three-dimensional stacked configuration where the microstrip circuit and waveguide are positioned in different layers separated by a dielectric substrate. This vertical arrangement in the third dimension enables efficient coupling and broadband transition without increasing the planar footprint, thereby maintaining compact component size while achieving high data communication speeds
Solution Approach 2:
The patent divides the transition structure into distinct functional segments: the microstrip feeding line in one layer, the dielectric substrate in the middle layer, and the waveguide in the opposite layer. This segmentation allows each component to be independently optimized for its specific function while working together to achieve broadband performance without requiring large overall dimensions
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 increases bandwidth and allows for downsizing of components, improving data communication speed and reducing costs by optimizing signal transition between microstrip circuits and waveguides.
Implementation Method 1
a waveguide being coupled to the microstrip circuit, the waveguide comprising a dielectric part comprising a first and a second dielectric part having different permittivity, and a metal part surrounding the dielectric part
Data Source
AI summary
The present invention relates to a microstrip circuit and a chip-to-chip interface apparatus comprising the same. According to one aspect of the invention, there is provided a microstrip circuit. The microstrip circuit includes a feeding line providing a signal, a probe being connected to one end of the feeding line, and a patch emitting the signal to a waveguide. The patch is disposed in a layer opposite to a layer in which the feeding line and the probe are disposed, with a core substrate being positioned therebetween. At least one of length of the probe, thickness of the core substrate, and permittivity of the core substrate is determined based on bandwidth of a transition between the microstrip circuit and the waveguide.