Monolithic Coated Antenna for Harsh Environments
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Solution Overview
Problem
Conventional communications antennas are not suitable for extreme environmental conditions such as deep-ocean pressure, high altitude, and sub-freezing temperatures, and they often require reliable operation for extended periods without maintenance.
Innovation Solution
A communications antenna with a conductive trace on a planar dielectric substrate, encased in a continuous monolithic coating that provides protection and maintains high-efficiency radio frequency performance, achieved through a molding process that ensures accurate and consistent coating thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antennas are used in harsh environments, then manufacturing cost and complexity are low, but reliability and performance stability deteriorate under extreme conditions
Solution Approach 1:
The coating structure is divided into multiple functional layers: a monolithic coating layer providing environmental protection, and an RF coating layer providing radio frequency performance. This segmentation allows each layer to be optimized for its specific function, improving overall reliability while managing complexity through functional separation.
Solution Approach 2:
The antenna employs a composite coating structure combining monolithic coating material and RF coating material with different properties. The monolithic layer provides mechanical protection and environmental resistance, while the RF layer ensures electromagnetic performance, creating a composite system that addresses multiple requirements simultaneously.
2Manufacturing precision
If coating thickness varies on the antenna surface, then manufacturing process is simpler, but transmission efficiency and performance stability deteriorate
Solution Approach 1:
A mandrel is introduced as an intermediary tool during the coating process. The mandrel rotates the antenna at controlled speeds while coating material is applied, ensuring uniform thickness distribution. This intermediary mechanism achieves precise thickness control without requiring complex manual application processes.
Solution Approach 2:
The manual or complex mechanical coating application process is replaced with a automated rotation system. The antenna rotates on a mandrel while coating material is sprayed or deposited, allowing consistent thickness through controlled rotation rather than complex positioning mechanisms.
3Manufacturing precision
If pins are used to hold antenna element during coating, then positioning accuracy is good, but coating continuity deteriorates due to pin holes
Solution Approach 1:
The antenna element is positioned and secured with pins before the coating process begins. This preliminary positioning ensures accurate placement, and the pins are removed after coating completes, allowing the coating to fill the pin hole volumes and maintain continuity without compromising initial positioning accuracy.
Solution Approach 2:
The pins are used temporarily during the coating process to hold the antenna element in position, then discarded (removed) after coating is complete. The coating material fills the volumes previously occupied by the pins, and the pins are recovered for potential reuse, resolving the conflict between positioning needs and coating continuity.
Data Source
AI summary
Communications antennae suitable for operating in harsh environmental conditions and methods for providing such antennae are disclosed. Exemplary implementations of the communications antenna may provide an ability to transmit and receive radio frequency signals while being exposed to formidable conditions for many years. Such conditions may include one or more of shallow and deep ocean, radioactive, ultraviolet, ultra cold, ultra-high pressure, and/or other harsh environments. The antenna may be ruggedized to withstand attacks by marine mammals and fish, encounters with fishing equipment including nets and lines, entanglement with marine debris, abrasion (e.g., by coral, sand, rock, and/or other objects), collision with maritime vessels and submersibles, and/or other unpredictable events. The efficient radio frequency design and efficient form factor may provide users with a small, unobtrusive device with a capacity for extensive integration in the radio frequency domain.