Rotary Joint mm-Wave Link With Waveguide for Full-Duplex Data
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Solution Overview
Problem
Current wireless data transfer technologies for rotary joints face challenges in achieving continuous and full-duplex high-speed data transmission, particularly in industrial settings where mechanical rotation and interference pose significant limitations, and existing solutions are not reliable or efficient enough to meet the demands of modern industrial automation.
Innovation Solution
The implementation of a semi-closed wireless data transfer system using mm-wave communication with elliptically polarized antennas and a waveguide, which enables high-speed, wideband data transfer by configuring RF transceivers with wide-beam, low-gain antennas and utilizing a waveguide to facilitate signal transmission and reception between rotating components, thereby overcoming issues of alignment and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If optical signals are used for data transfer between rotating components, then high-speed data transfer can be achieved, but precise alignment of narrow optical beams is required and the system is easily affected by contamination
Solution Approach 1:
The patent replaces optical signals with radio frequency (RF) electromagnetic waves for wireless data transfer. RF waves have wider beams and are less sensitive to alignment issues and contamination compared to optical signals, thereby maintaining high-speed data transfer while improving reliability in rotary joint applications
Solution Approach 2:
The patent changes the wavelength parameter of the electromagnetic signal from optical range to RF range. This parameter change results in wider beam patterns and reduced sensitivity to misalignment and environmental contamination, resolving the contradiction between speed and reliability
2Reliability
If radio systems are used for wireless data transfer in rotary joints, then alignment issues and contamination sensitivity are reduced, but ensuring continuous and full-duplex data transmission becomes challenging
Solution Approach 1:
The patent divides the RF system into separate transmit and receive frequency bands. By segmenting the frequency spectrum, the system can perform full-duplex communication (simultaneous transmission and reception) without self-interference, reducing the complexity of coordinating transmit/receive operations
Solution Approach 2:
The patent introduces a waveguide as an intermediary component to couple the RF transceiver to the rotating antenna. The waveguide provides a stable mechanical and electromagnetic interface that simplifies the overall system design while enabling continuous data transmission during rotation
3Ease of operation
If wide-beam low-gain antennas are used for RF communication, then alignment tolerance is improved, but signal strength and transmission distance are reduced
Solution Approach 1:
The patent employs circularly polarized antennas that can receive signals from any rotational position with consistent performance. This multi-directional reception capability provides both wide alignment tolerance and maintains adequate signal strength, as the circular polarization pattern ensures uniform gain in all directions
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 provides a compact, cost-effective, and reliable data interconnect with high reconfigurability, capable of achieving high-speed data transfer rates while maintaining mechanical integrity and reducing power consumption, thus addressing the limitations of existing technologies in rotary joint applications.
Implementation Method 1
a waveguide configured to receive a wireless signal transmitted by the transmitter, transmit through the waveguide (i.e., not wirelessly) a signal, the signal being indicative of the wireless signal received by the waveguide, and transmit a wireless output signal
Implementation Method 2
configuring RF transceivers with wide-beam, low-gain antennas and utilizing a waveguide to facilitate signal transmission and reception between rotating components
Data Source
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AI summary
Systems configured to implement semi-closed wireless data transfer for rotary joints are disclosed. An example system includes first and second RF transceivers, to be included in different components of a rotary joint. The first and second RF transceivers implement elliptically (e.g., circularly) polarized antennas to realize a short distance communication link (e.g., a 60 GHz short distance communication link) between the two components of a rotary joint. The example system further includes an open-ended waveguide (OEWG) between the first and second RF transceivers, for receiving, at a first end of the OEWG, wireless signals transmitted by one of the first and second RF transceivers, transmitting the received signals through the OEWG, and radiating, at a second end of the OEWG, wireless signals indicative of the received wireless signals, to be received by another one of the first and second RF transceivers.