Deployable Helix Antenna Structure for Stable Wideband Radiation
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Solution Overview
Problem
Existing helical antennas face challenges in efficiently radiating pulses across a wide frequency range, particularly in the VHF and UHF bands, and require improved structural designs for deployment and stability in space and subsurface radar applications.
Innovation Solution
A deployable helix antenna design featuring a retractable stem, bulkheads, and a cord network that tensions to maintain stability and support during deployment, allowing operation across a range of frequencies from 30 MHz to 3 GHz, with a focus on VHF (240-270 MHz) and UHF (360-380 MHz) bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional fixed helical antenna is used, then the radiation pattern and gain are stable, but the antenna cannot be deployed in space-constrained environments and cannot adapt to different operational requirements
Solution Approach 1:
The antenna is divided into multiple discrete helical sections that can be independently stored and deployed. Each section contains its own bulkheads and support structures, allowing the antenna to be segmented for compact storage while maintaining structural integrity during deployment. This segmentation enables the antenna to transition from a compact stowed configuration to a fully deployed operational configuration in space-constrained environments.
Solution Approach 2:
The helical antenna sections are designed to nest within each other during stowage, with each section containing the next section inside it. This nested configuration minimizes the stowed volume while allowing sequential deployment of each section. The bulkheads and support structures are also designed to nest during stowage, reducing the overall structural footprint for space-constrained applications.
2Volume of moving object
If the antenna is made deployable with retractable stem and bulkheads, then it can be stored in compact form, but the structural stability and gain may deteriorate during deployment
Solution Approach 1:
The bulkheads are pre-positioned at predetermined locations along the retractable stem before deployment. These bulkheads serve as pre-established support structures that maintain the relative positioning of helical sections during deployment. The support struts are also pre-configured to engage with specific bulkheads, ensuring that structural stability is maintained as each section is deployed sequentially from the compact stowed configuration.
Solution Approach 2:
The support struts are extracted or extended from the bulkheads during deployment to provide additional structural reinforcement. These struts are stored within the bulkhead structures during stowage and are deployed outward as each helical section is extended, providing the necessary structural stability without increasing the stowed volume. This extraction mechanism allows the antenna to achieve full structural integrity only when needed during operational deployment.
3Adaptability or versatility
If the antenna operates across a wide frequency range (30 MHz to 3 GHz), then it provides versatile communication capabilities, but the antenna dimensions and structural requirements become more complex
Solution Approach 1:
The antenna employs adjustable helical sections with variable pitch and diameter that can be configured for different frequency ranges. Each section can be independently adjusted or reconfigured to optimize performance for specific frequency bands within the 30 MHz to 3 GHz range. This dynamic adjustability allows the same physical structure to accommodate multiple frequency requirements without requiring separate fixed-dimension antennas for each band.
Solution Approach 2:
Different sections of the helical antenna are designed with locally optimized dimensions and characteristics tailored to specific frequency ranges. Lower frequency sections have larger dimensions and wider spacing, while higher frequency sections have smaller dimensions and tighter spacing. This local quality variation across the antenna structure enables wide frequency coverage while keeping each individual section's dimensions manageable and appropriate for its designated frequency range.
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
The design enhances gain and stability, enabling efficient space-to-ground data transmission and subsurface radar operations by maintaining structural integrity and directional radiation patterns, particularly in challenging environments.
Implementation Method 1
A deployable helix antenna design featuring a retractable stem, bulkheads, and a cord network that tensions to maintain stability and support during deployment
Implementation Method 2
A helix antenna and methods of making and using helix antenna to concurrently or independently radiate pulses in the range of about 30 MHz to about 3 GHz
Data Source
AI summary
A helix antenna and methods of making and using helix antenna to concurrently or independently radiate pulses in a very high frequency (VHF) band in a range of about 240 MHz to about 270 MHz and/or in an ultrahigh frequency (UHF) band in a range of about 360 MHz to about 380 MHz which can be useful in space to ground data transmissions, subsurface radar, and measurement of ice and snow pack.