Reconfigurable Aperture-Coupled Patch Antenna for Conformal Mounting
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Solution Overview
Problem
Existing reconfigurable planar antennas are bandwidth-limited and sensitive to the conductivity of mounting surfaces, making them unsuitable for conformal applications on non-planar surfaces like aircraft wings and UAVs, which require low-profile, wideband, and surface-agnostic antennas with minimal electrical behavior changes.
Innovation Solution
A reconfigurable aperture-coupled patch antenna with a microstrip feed network and a lower electrical ground plane, featuring a composite dielectric structure with an inner antenna element and a coupling antenna element that can be electrically shorted using RF switches, allowing for efficient signal propagation and reduced signal loss due to antenna misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing reconfigurable planar antennas are used, then bandwidth is limited, but if aperture coupled feed is used, bandwidth increases while sensitivity to surface conductivity occurs
Solution Approach 1:
The patent introduces an aperture coupling structure as an intermediary between the feed line and the antenna element. This aperture acts as a mediator that transfers energy while isolating the antenna from direct contact with the conductive surface, thereby reducing sensitivity to surface conductivity variations while maintaining enhanced bandwidth performance.
Solution Approach 2:
The patent transitions from a planar two-dimensional antenna structure to a three-dimensional configuration by introducing a substrate thickness dimension. The aperture coupling mechanism utilizes this third dimension to create electromagnetic coupling paths that are less sensitive to surface conductivity, effectively adding a dimensional degree of freedom to solve the contradiction.
2Adaptability or versatility
If conventional feed structures are used, then antenna performance varies with mounting surface, but if microstrip feed with lower electrical ground plane is used, performance becomes surface agnostic
Solution Approach 1:
The patent segments the feed network into distinct functional layers: a microstrip feed layer, an aperture coupling layer, and a lower electrical ground plane layer. This segmentation allows each layer to perform its specific function independently, creating a modular structure that achieves surface agnosticism while managing complexity through functional decomposition.
Solution Approach 2:
The patent utilizes vertical layering (adding the z-dimension) to separate the feed network from the mounting surface. By placing the lower electrical ground plane at a distance from the conductive surface through multiple dielectric layers, the system achieves surface agnosticism by operating in a different dimensional space where surface conductivity has minimal impact.
3Adaptability or versatility
If antenna elements are electrically shorted to coupling elements, then bandwidth increases and axial ratio reduces, but reconfiguration complexity increases
Solution Approach 1:
The patent implements dynamic reconfiguration capability by incorporating switches that can electrically connect or disconnect the antenna element from the coupling elements. This dynamic switching mechanism allows the antenna to adapt its electrical characteristics for optimal bandwidth and axial ratio performance while maintaining a relatively simple structural configuration through controlled connectivity changes.
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 provides increased bandwidth, reduced axial ratio, and minimized electrical behavior changes due to conductive surfaces, making it suitable for conformal applications with improved efficiency and reduced signal loss.
Implementation Method 1
A reconfigurable aperture-coupled patch antenna with a microstrip feed network and a lower electrical ground plane, featuring a composite dielectric structure with an inner antenna element and a coupling antenna element that can be electrically shorted using RF switches, allowing for efficient signal propagation and reduced signal loss due to antenna misalignment
Data Source
AI summary
An electronically configurable antenna is disclosed. In one embodiment, the antenna comprises a circuit board having a composite dielectric that has a top surface and a bottom surface. An inner antenna element and a coupling element are disposed on the top surface, with the coupling element disposed about a periphery of and substantially coplanar with the antenna element. The coupling element is selectably electrically shorted to the inner antenna element to configure the antenna. The electronically configurable antenna further has a conductor extending through the composite dielectric between the top surface and the bottom surface and a lower electrical ground plane on the bottom surface to minimize any change in the antenna's electrical behavior due to the conductivity of the surfaces to which they are mounted.