Configurable Antenna Assembly Using Phase Change Material Switches
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Solution Overview
Problem
Existing antenna assemblies are limited in their ability to provide a compact design with wideband instantaneous bandwidth, scan capability beyond 60°, and polarization diversity, often requiring static designs that can only support one system function and frequency, with fragmented arrays being inefficient and limited in scan volume.
Innovation Solution
A configurable phased-array antenna assembly using phase change material (PCM) switches to selectively switch between multiple antenna personalities, featuring a second ground plane with PCM switches that can be activated or deactivated to change between grounding and non-grounding states, and control grids with inductors at sub-wavelength intervals for frequency-selective operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a static antenna assembly is used to maintain ultrawide bandwidth ratio of 6:1 or more, then bandwidth is improved, but scan capability is limited to 45° from normal to the antenna face
Solution Approach 1:
The patent applies dynamics by transitioning from a static antenna assembly to a reconfigurable phased array system. The antenna elements are equipped with phase shifters and amplitude controllers that enable dynamic adjustment of beam direction and shape, allowing the antenna to scan beyond the 45° limitation while maintaining ultrawide bandwidth operation through electronic reconfiguration
2Duration of action of stationary object
If spiral antennas are used to provide wide bandwidth, then bandwidth is improved, but the antenna size becomes too large for practical applications
Solution Approach 1:
The patent applies segmentation by dividing the antenna system into multiple discrete planar elements arranged in a phased array configuration. Each element is a compact planar structure, and collectively they achieve wide bandwidth operation through coherent combining and phase control, avoiding the large size requirement of spiral antennas while maintaining practical dimensions
Solution Approach 2:
The patent transitions from the two-dimensional spiral geometry to a three-dimensional phased array structure with multiple planar elements spaced in depth. This dimensional change enables compact individual element sizes while achieving wide bandwidth through spatial diversity and phase control across the array volume
3Duration of action of stationary object
If connected arrays over a ground plane are used to achieve wide bandwidth ratio of 9:1, then bandwidth is improved, but VSWR becomes undesirably large when scanned beyond 50° from normal
Solution Approach 1:
The patent applies dynamics by implementing electronic beam steering through phase shifters that adaptively control the phase and amplitude of each array element. This dynamic control enables the system to maintain optimal impedance matching and low VSWR across wide scan angles by electronically adjusting the radiation pattern, avoiding the fixed-geometry limitations that cause VSWR degradation in conventional ground plane arrays
Solution Approach 2:
The patent changes the operating parameters by using phase shifters and amplitude controllers to dynamically adjust the electrical characteristics of each array element. This parameter control enables maintenance of consistent VSWR performance across wide bandwidth and scan angles, overcoming the fixed-parameter limitations of conventional connected arrays over ground planes
4Volume of moving object
If fragmented antenna arrays are used to achieve compact size, then antenna volume is reduced, but scan volume is limited and efficiency decreases
Solution Approach 1:
The patent applies segmentation by using multiple discrete planar antenna elements arranged in a phased array, where each element is compact but the collective array achieves large scan volume through coherent combining and phase control, maintaining high efficiency through constructive interference patterns
Solution Approach 2:
The patent merges multiple compact planar elements into a unified phased array system with coherent signal combining. This merging enables the compact structure to achieve large effective scan volume through phase-controlled beam steering while maintaining high radiation efficiency through constructive interference, overcoming the limitations of fragmented arrays
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
Enables adaptable antenna patterns for various frequencies and polarizations, achieving wideband communication with a 6:1 bandwidth ratio and scan angles up to 60°, providing polarization diversity and efficient RF performance across multiple operational scenarios.
Implementation Method 1
A configurable phased-array antenna assembly using phase change material (PCM) switches to selectively switch between multiple antenna personalities
Implementation Method 2
control grids with inductors at sub-wavelength intervals for frequency-selective operation
Data Source
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AI summary
An antenna assembly may include a first ground plane, a second ground plane that may be switched between grounding and non-grounding states, and first and second antenna layers. Each of the first and second antenna layers may include a plurality of pixels interconnected by a plurality of phase change material (PCM) switches. The PCM switches are configured to be selectively switched between phases to provide a plurality of antenna patterns within the first and second antenna layers.