Nanosatellite Antenna With Dielectric Waveguide and Fluidized Deployment
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Solution Overview
Problem
Designing compact antennas for nanosatellites that can efficiently receive and transmit radio frequency waves while accommodating the physical constraints of small spacecraft and withstanding high G-forces during launch is challenging due to the large size of RF wavelengths relative to the satellite's dimensions.
Innovation Solution
A dielectric waveguide coupled with a nanosatellite antenna, featuring a slot or taper, that focuses and waveguides electromagnetic radiation, and a fluidized membrane system to deploy and form rigid structures for antenna and support systems, allowing for compact deployment and expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large antenna is used to efficiently receive and transmit RF waves, then the antenna gain and bandwidth are improved, but the satellite size and volume increase
Solution Approach 1:
The antenna is designed to be deployable, transitioning from a compact stowed configuration during launch to an extended operational configuration in space. This dynamic transformation allows the antenna to achieve its full operational length and performance characteristics only when needed, resolving the contradiction between large antenna size for good RF performance and small volume for launch constraints.
2Reliability
If a long antenna is used to achieve efficient RF transmission, then the signal gain is improved, but the antenna becomes vulnerable to damage during high G-load launch
Solution Approach 1:
The antenna structure transitions from a retracted, protected state during launch to an extended, operational state in space. By deploying the antenna only after launch, the structure avoids exposure to high G-loads during the most stressful phase of flight, thereby maintaining structural integrity while still achieving the necessary signal transmission quality.
3Volume of moving object
If a compact antenna is used to fit within small nanosatellite dimensions, then the satellite volume is reduced, but the antenna gain and RF performance deteriorate
Solution Approach 1:
The deployable antenna allows the satellite to maintain a compact volume during launch while achieving full antenna performance in orbit. The antenna extends to its full operational length after launch, providing the necessary gain and RF performance characteristics without permanently increasing the satellite's volume envelope.
Solution Approach 2:
The antenna utilizes the third dimension by extending radially outward from the satellite body in the deployed state, rather than being constrained to the satellite's primary volume envelope. This dimensional transition allows the antenna to achieve its full operational length and performance characteristics without permanently increasing the satellite's volume.
4Reliability
If a deployable structure is used to achieve large antenna size, then the antenna performance is improved, but the device complexity increases
Solution Approach 1:
The deployment mechanism is extracted and isolated as a separate, dedicated subsystem rather than being integrated into the antenna structure itself. This separation allows the deployment function to be simplified and specialized, reducing the overall complexity of the antenna system while still enabling the necessary deployable functionality.
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 solution enables efficient RF signal transmission and reception with reduced antenna size, accommodating smaller spacecraft and deploying structures post-launch, enhancing signal gain and bandwidth while withstanding high G-forces.
Implementation Method 1
a waveguide coupled to the antenna, the waveguide comprising a dielectric: focusing electromagnetic radiation incident from free space into the waveguide, waveguiding the electromagnetic radiation to the antenna
Implementation Method 2
one or more conduits each having an outlet transferring a fluid into the one or more of the bags in fluidic communication with the conduits, wherein the fluid pressurizes the one or more bags and expands the membrane
Implementation Method 3
expands the membrane so as to deploy and form each of the one or more bags into a rigid structure
Data Source
AI summary
A nanosatellite or drone, including an antenna; a dielectric waveguide coupled to the antenna, the waveguide comprising at least one of a slot or a taper and the waveguide (1) focusing electromagnetic radiation incident from free space into the waveguide and (2) waveguiding the electromagnetic radiation to the antenna. Also disclosed is a system for deploying a support structure, or device having electromagnetic functionality, including one or more bags each having a wall comprising a membrane; one or more conduits each having an outlet transferring fluid into the one or more of the bags in fluidic communication with the conduits, wherein the fluid pressurizes each of the one or more bags and expands the membrane so as to deploy and form each of the one or more bags into a support or the device having electromagnetic functionality.