Conformal Antenna with Tunable Dielectric Cavities
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Solution Overview
Problem
There is a need for low-profile, electronically steerable conformal antennas that can efficiently operate on non-planar surfaces like aircraft wings and fuselages, particularly for UAVs, which require low power consumption and cost-effectiveness while being able to conform to conductive materials without significant changes in antenna behavior.
Innovation Solution
The development of an electronically steerable conformal antenna using a composite dielectric with tunable cavities filled with permittivity materials, such as liquid crystals, and a microstrip feed network, allowing for individual tuning of antenna elements via DC bias voltage and aperture coupling to minimize electrical behavior changes due to conductive surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing steerable antennas based on electronics with magnitude and/or phase shifting ability are used, then beam steering capability is achieved, but power consumption is high and cost is prohibitive
Solution Approach 1:
The patent changes the electrical parameter (permittivity) of the dielectric material within the cavity to achieve beam steering. By varying the permittivity of the tunable dielectric material, the resonant frequency of each antenna element can be adjusted, enabling electronic beam steering without requiring high-power phase shifters or magnitude controllers.
2Ease of operation
If varactors or diodes are used for steering, then beam steering is achieved, but integration into processing is difficult
Solution Approach 1:
The patent extracts the steering function from traditional active components (varactors, diodes) and implements it through passive tunable dielectric material. This removes the need for complex integrated circuits and makes the steering mechanism simpler to integrate into the antenna structure, while still achieving electronic control of beam direction.
3Shape
If conformal antennas are designed for non-planar surfaces, then conformality is achieved, but antenna behavior changes due to conductive surfaces
Solution Approach 1:
The patent introduces a cavity structure as an intermediary between the antenna element and the conductive surface. This cavity, filled with tunable dielectric material, acts as a buffer that isolates the antenna element from the influence of the conductive surface, thereby maintaining consistent antenna behavior while still conforming to non-planar surfaces.
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
This solution enables a low-profile, cost-effective, and power-efficient electronically steerable antenna that can conform to non-planar surfaces, maintaining performance and reducing radar cross-sections, with the ability to steer energy direction effectively.
Implementation Method 1
each tunable cavity comprises a tunable material with a permittivity that is tunable via application of a DC bias voltage
Implementation Method 2
The conductor forms a microstrip feed network extending between each of the antenna elements
Implementation Method 3
at least a portion of the conductor is disposed within each of the tunable cavities between the slot and the bottom surface conductive ground plane
Data Source
AI summary
An electronically steerable conformal antenna is disclosed. The antenna comprises a circuit board having a composite dielectric. The composite dielectric includes an array of a plurality of antenna elements disposed on the top surface and an array of tunable cavities, each tunable cavity disposed between an associated antenna element and a conductive ground plane on the composite dielectric's bottom surface. The composite dielectric also includes a conductor, extending from an antenna input through the composite dielectric and the tunable cavities and which forms a microstrip between each of the antenna elements.