PCB Integral RF Waveguide for High-Bandwidth Interconnects
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Solution Overview
Problem
Conventional communication systems in data centers face limitations in bandwidth due to electromagnetic induction in conductor-based interconnects and high costs associated with optical interconnects, while metal waveguides are rigid and expensive to implement.
Innovation Solution
The integration of an integral radio frequency waveguide within the layers of a printed circuit board assembly, which reduces copper usage, decreases board size, and increases bandwidth, allowing for higher density and power savings by using conductive walls or dielectric materials to propagate millimeter waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conductor-based interconnects are used for signal transmission, then the system is easier to manufacture, but the bandwidth is limited due to electromagnetic induction
Solution Approach 1:
The patent replaces conventional conductor-based electrical interconnects with radio frequency waveguides that transmit electromagnetic waves (millimeter waves) through dielectric or hollow channels. This substitution transitions from electrical signal transmission subject to electromagnetic induction limitations to wave-based transmission capable of higher bandwidths, while maintaining integration within the PCB structure for manufacturability
Solution Approach 2:
The patent changes the transmission medium from conductive materials to dielectric materials or hollow waveguide channels, and changes the signal type from electrical signals to radio frequency electromagnetic waves. This parameter change enables operation at millimeter wave frequencies (e.g., 28 GHz, 38 GHz, 60 GHz) achieving bandwidths exceeding 100 Gb/s, while the waveguide structure is integrated into PCB layers for practical manufacturing
2Productivity
If optical interconnects are used to increase bandwidth, then the bandwidth requirement is met, but the cost increases significantly
Solution Approach 1:
The patent employs radio frequency waveguides constructed from standard PCB materials (dielectric layers, copper cladding, or hollow channels) that are significantly cheaper than optical interconnect components. The waveguide structure leverages existing PCB manufacturing processes, avoiding the need for expensive optical connectors, lasers, and photodetectors, thereby achieving high bandwidth at a fraction of the cost of optical solutions
Solution Approach 2:
The patent utilizes composite PCB structures combining dielectric materials with conductive cladding or hollow channels to create integrated waveguides. These composite structures leverage standard PCB materials and manufacturing techniques, making high-bandwidth transmission economically viable compared to pure optical interconnect solutions
3Productivity
If metal waveguides are used for RF transmission, then the bandwidth is increased, but the device becomes rigid and expensive
Solution Approach 1:
The patent divides the waveguide structure into segments integrated within individual PCB layers or across multiple layers. Each layer can define portions of the waveguide channel, allowing modular construction and assembly. This segmentation enables flexible PCB design while maintaining the high-bandwidth benefits of waveguide transmission, avoiding the need for single-piece rigid metal waveguide components
Solution Approach 2:
The patent transitions from traditional planar PCB traces to three-dimensional waveguide channels that extend through multiple PCB layers. The waveguide structure utilizes the vertical dimension by creating hollow channels or dielectric-filled passages through stacked PCB layers, enabling RF transmission with reduced interference and improved performance while maintaining PCB flexibility and integrability
4Reliability
If more copper is used in the PCB, then the electrical connectivity is improved, but the board size and weight increase
Solution Approach 1:
The patent replaces extensive copper trace networks with integrated radio frequency waveguide structures that use minimal copper cladding or none at all (in hollow waveguide configurations). The waveguide channels are formed using dielectric materials or hollow spaces within the PCB, dramatically reducing copper content while maintaining or improving transmission performance through electromagnetic wave propagation
Solution Approach 2:
The patent changes the transmission mechanism from electrical conduction requiring thick copper traces to electromagnetic wave propagation through dielectric or hollow channels. This parameter change reduces the amount of copper needed from substantial trace widths to thin cladding layers or eliminates copper entirely in the signal path, reducing board weight and material usage while preserving connectivity
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 solution enables high-speed, short-reach communication links with increased bandwidth and reduced size and power consumption, overcoming the limitations of conventional systems by facilitating efficient wireless signal transmission between digital electronic components.
Implementation Method 1
at least one of the plurality of layers defines a channel configured to confine radio frequency waves therein
Implementation Method 2
The antenna is configured to transmit radio frequency signals generated by the digital electronic component into the channel as radio frequency waves
Implementation Method 3
the digital electronic component is configured to convert between electrical signals and radio frequency signals
Data Source
AI summary
An printed circuit board (PCB) assembly and method of assembling the same for a high-speed, short-reach communication link are described that provide a mechanism for transmitting radio frequency (RF) waves from one digital electronic component of the PCB assembly to another, where the second digital electronic component is located either on the same PCB assembly or on a second PCB assembly. The assembly includes a PCB having multiple layers and a digital electronic component supported by the PCB. At least one of the layers defines a channel that confines RF waves therein. An RF antenna in communication with the digital electronic component extends into the channel, and the RF antenna transmits RF signals generated by the digital electronic component into the channel as RF waves or receives RF waves via the channel and conveys corresponding RF signals to the digital electronic component.