Electronically Scanning Antenna Assembly for Low-Drag Aerospace Applications
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Solution Overview
Problem
Aerospace applications require lightweight, low-drag, and compact antennas that can be positioned on non-planar surfaces without compromising fuel efficiency or maneuverability, as traditional antennas like dish antennas and slotted copper waveguide pipes are too bulky and heavy.
Innovation Solution
A compact antenna assembly featuring a base with feed transitions, a non-metallic support panel, and metallic T-shaped probes separated by a feed gap, all formed from circuit board materials, which allows for electronically steerable operation without moving parts and reduces weight and aerodynamic drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dish antennas are used to achieve reliable radio wave transmission and reception, then antenna performance is improved, but weight and size increase substantially, reducing fuel efficiency and maneuverability
Solution Approach 1:
The patent replaces traditional mechanical dish antenna structures with an electronically scanned array of small antenna elements. Instead of physically moving a large dish to steer the beam, the system uses electronic phase control across multiple small elements to achieve beam steering, thereby eliminating the need for heavy mechanical components while maintaining reliable radio wave transmission and reception.
Solution Approach 2:
The patent divides a single large antenna into multiple small antenna elements arranged in an array. Each element is fed by a separate feed horn and can be independently controlled. This segmentation allows the system to achieve the functionality of a large antenna while using many small, lightweight components, significantly reducing overall weight and size.
2Reliability
If slotted copper waveguide pipes are used to form the aperture section, then antenna performance is improved, but manufacturing complexity and weight increase
Solution Approach 1:
The patent replaces complex slotted copper waveguide pipes with simple feed horns and planar antenna elements. Instead of manufacturing intricate waveguide structures with precision slots, the system uses conventional feed horns coupled to simple antenna elements, dramatically simplifying the manufacturing process while maintaining antenna performance.
3Reliability
If large antenna structures are used to ensure stable signal transmission, then transmission stability is improved, but aerodynamic drag increases, reducing fuel efficiency
Solution Approach 1:
The patent uses multiple small antenna elements instead of a single large structure. These elements can be arranged in a compact planar configuration that presents minimal aerodynamic profile. The segmented structure maintains signal transmission stability through electronic beam forming while keeping the physical footprint small, thereby reducing aerodynamic drag.
Solution Approach 2:
The patent transitions from a three-dimensional bulky dish structure to a two-dimensional planar array of antenna elements. This dimensional reduction allows the antenna to achieve stable signal transmission through electronic control while maintaining a low-profile configuration that minimizes aerodynamic drag in the flight direction.
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 antenna assembly provides improved radio frequency performance, agile scanning capabilities, and dual linear polarization, maintaining performance while being lightweight and low-profile, suitable for aircraft and other vehicles without reducing fuel efficiency or maneuverability.
Implementation Method 1
one or more T-shaped probes (such as metallic T-shaped probes) that couple the feed transition(s) to the patch
Implementation Method 2
The transmitter provides an electric current to terminals of the antenna, which in response radiates electromagnetic waves. Alternatively, as radio waves are received by the antenna, an electrical current is generated at the terminals
Data Source
AI summary
An antenna assembly includes a base including one or more feed transitions, a support panel separated from the base, a patch secured to the support panel, and one or more T-shaped probes that couple the feed transition(s) to the patch. The T-shaped probe(s) are separated from the patch.