Omnidirectional Antenna System for Aerospace Vehicles
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Solution Overview
Problem
Aerospace vehicles face challenges in finding suitable locations for exterior-mounted antennas due to factors like aerodynamic effects, environmental exposure, and structural constraints, making it difficult to achieve desired communications coverage without increasing complexity and weight.
Innovation Solution
A phased omnidirectional antenna system is proposed, comprising a first and second antenna configured to provide omnidirectional coverage, with each antenna having a radiation pattern that complements the other to fill nulls created by the vehicle's structure, using phase shifters to prevent destructive interference and enhance coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an exterior-mounted antenna is installed on an aerospace vehicle, then communications coverage is provided, but the antenna is exposed to environmental factors and aerodynamic effects
Solution Approach 1:
The antenna is embedded within conformal structures such as fairings, radomes, or body panels of the aerospace vehicle. This nesting approach protects the antenna from environmental exposure and aerodynamic effects while maintaining its communications function, as the antenna operates within the protective envelope of the vehicle's skin or attached structures.
Solution Approach 2:
A conformal structure (fairing, radome, or body panel) serves as an intermediary between the antenna and the harsh external environment. This intermediate structure shields the antenna from direct exposure to airflow, ice accretion, and other environmental factors while allowing the antenna to maintain its communications coverage.
2Object-affected harmful factors
If a radome is used to protect the antenna, then environmental exposure is reduced, but system complexity, weight and cost increase
Solution Approach 1:
The antenna protection function is merged with the vehicle's existing conformal structures such as fairings, radomes, or body panels. Rather than adding a separate protective radome, the antenna is embedded within these existing structures, which already serve aerodynamic and structural functions. This integration reduces overall system complexity while maintaining environmental protection.
Solution Approach 2:
The conformal structure housing the antenna serves multiple functions: it provides aerodynamic shaping, structural support, and environmental protection for the antenna. This multi-functionality eliminates the need for dedicated protective components, reducing system complexity and weight.
3Object-affected harmful factors
If conformal antennas are embedded in vehicle structures, then environmental protection is improved, but finding suitable mounting locations becomes more difficult
Solution Approach 1:
The antenna system is segmented into multiple distributed elements rather than a single centralized antenna. By placing smaller antenna elements at different locations on the vehicle structure (such as on fairings, stabilizers, or body panels), the system achieves omnidirectional coverage while each individual location presents fewer mounting challenges than a single large antenna would require.
Solution Approach 2:
The antenna system transitions from a single-point mounting solution to a distributed array across multiple surfaces and dimensions of the vehicle. By utilizing the three-dimensional space available on the vehicle exterior, the system finds suitable mounting locations on various conformal structures that would not be suitable for traditional single-antenna installations.
4Reliability
If multiple antennas are used to provide omnidirectional coverage, then coverage is improved, but system complexity increases
Solution Approach 1:
Multiple antenna elements are merged into a single integrated conformal antenna system embedded within the vehicle structure. The individual antenna elements are coordinated through phase control to function as a unified omnidirectional system, reducing the complexity that would arise from managing separate antenna systems while maintaining the benefits of multiple radiating elements.
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 system effectively provides omnidirectional coverage while minimizing the need for radomes, reducing complexity and weight, and allowing for installation in constrained aerospace vehicle environments.
Implementation Method 1
a first antenna (102), and a second antenna (104) opposite the first antenna (102), wherein the first antenna (102) and the second antenna (104) are configured to provide omnidirectional coverage
Implementation Method 2
using phase shifters to prevent destructive interference and enhance coverage
Data Source
AI summary
An antenna system may include a first antenna, and a second antenna opposite the first antenna, wherein the first antenna and the second antenna are configured to provide omnidirectional coverage.