Phased Array Antenna Nested Cavity Isolation
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Solution Overview
Problem
Current phased array antennas face challenges in achieving efficient radiation with individual elements occupying small physical areas, maintaining high impedance matching over wide frequency bands, achieving high inter-element isolation, and providing flexibility across various sizes and frequencies.
Innovation Solution
A phased array antenna design featuring a common conductive ground plane and shell with a dielectric superstrate layer, optimized cavity geometry, and specific antenna element structures to enhance radiation efficiency, inter-element isolation, and flexibility, including tapered walls and varied dielectric materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If individual antenna elements occupy small physical areas, then the antenna array can be compact and flexible, but the impedance matching becomes difficult to maintain over wide frequency bands
Solution Approach 1:
The patent employs a nested cavity structure where each antenna element is placed within a conductive cavity that is nested within the larger array structure. This nested configuration allows compact physical footprint while maintaining proper impedance matching through the controlled cavity geometry and positioning, resolving the contradiction between small element area and wideband impedance matching.
Solution Approach 2:
The patent utilizes dielectric superstrate layers with specific permittivity values and varying thicknesses to adjust the electrical parameters of the antenna elements. By changing the dielectric parameters (permittivity, thickness), the antenna elements achieve wideband impedance matching despite occupying small physical areas, as the dielectric layers transform the electrical characteristics to maintain 50-ohm matching across frequency bands.
2Area of moving object
If antenna elements are spaced closely together, then the array can be compact, but the coupling between elements increases reducing inter-element isolation
Solution Approach 1:
The patent extracts and removes the harmful coupling effects by introducing conductive cavities around each antenna element. These cavities act as isolation structures that take out the problematic electromagnetic coupling between closely spaced elements, allowing compact array configuration while maintaining high inter-element isolation through the cavity boundaries.
Solution Approach 2:
The conductive cavities serve as intermediary structures between adjacent antenna elements. These cavity walls act as electromagnetic shields that mediate the interaction between closely spaced elements, preventing direct coupling while allowing the elements to remain in compact proximity for space efficiency.
3Adaptability or versatility
If the antenna array is designed for wide frequency operation, then the bandwidth increases, but the radiation efficiency decreases at certain frequencies
Solution Approach 1:
The patent employs dielectric superstrate layers with optimized permittivity values and thicknesses to transform the electrical characteristics of the antenna elements across different frequencies. By carefully selecting dielectric parameters, the system maintains consistent radiation efficiency over wide frequency bands, as the dielectric layers compensate for frequency-dependent variations in the electrical behavior of the compact antenna 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 design achieves improved radiation efficiency, reduced coupling between elements, and flexibility across a wide range of frequencies and sizes, enabling efficient beam steering and operation in complex environments.
Implementation Method 1
a common dielectric superstrate layer disposed over the common cavity at a predetermined distance from the plurality of antenna elements
Implementation Method 2
a common conductive shell electrically coupled to the common conductive ground plane. The common conductive shell extends away from common conductive ground plane and encompasses the antenna elements
Data Source
AI summary
An antenna element having a vertically stacked structure and a phased array antenna that includes a plurality of antenna elements sharing a common conductive ground plane are described. The phased array antenna also includes a common conductive shell electrically coupled to the common conductive ground plane and extending away there from to encompass the antenna elements. The common conductive shell and the common conductive ground plane together define a common cavity having a common aperture. The phased array antenna also includes a common dielectric superstrate layer disposed over the common cavity at a predetermined distance from the antenna elements and a beam steering system coupled to the antenna elements and configured for steering an energy beam produced by the phased array antenna.