Two-Dimensional Electronically-Steerable Antenna Impedance Surface
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Solution Overview
Problem
Current two-dimensional electronically-steerable artificial impedance surface antennas are costly and complex due to the need for complex voltage control networks and vias that reduce operational bandwidth and limit impedance tunability, making them unsuitable for low-cost and low-complexity applications.
Innovation Solution
The design incorporates a plurality of radiating elements with surface wave channels, switch elements, and impedance elements on a dielectric substrate, where surface waves are propagated and coupled to transmission lines through surface wave feeds, allowing for electronic steering of the radiation pattern by controlling voltages applied to switch elements, thereby modulating impedance and steering the main lobe in two dimensions without the need for complex voltage control networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex voltage control network is used to achieve two-dimensional electronic steering, then the steering capability is improved, but the device complexity and cost increase
Solution Approach 1:
The antenna surface is segmented into multiple independent impedance elements arranged in a two-dimensional array, where each element can be controlled independently through simple voltage application. This segmentation allows the complex steering function to be achieved through coordinated control of simple individual elements rather than a complex centralized control network.
Solution Approach 2:
Each impedance element in the array has locally adjustable impedance characteristics through voltage control, allowing the impedance pattern to be locally modified to achieve beam steering. By controlling the impedance at each local position rather than through a complex global control network, two-dimensional steering is achieved with simpler means.
2Ease of manufacture
If vias are used to connect impedance elements to voltage sources, then electrical connection is achieved, but the operational bandwidth is reduced
Solution Approach 1:
The problematic via structures are extracted and replaced with alternative connection methods such as printed circuit board traces or surface-mounted connections. This removal of the harmful via elements eliminates their detrimental effect on bandwidth while maintaining the necessary electrical connections between impedance elements and voltage sources.
3Adaptability or versatility
If a two-dimensional array of impedance elements with full voltage control is implemented, then arbitrary impedance patterns are achieved, but the cost and electronic complexity increase
Solution Approach 1:
Each impedance element in the array is designed as a universal component that can assume multiple impedance states through voltage control. This multi-functionality allows a single simple element design to perform various functions in different positions within the array, eliminating the need for complex position-specific control circuits and reducing overall electronic complexity.
Solution Approach 2:
The impedance of each element is made dynamically adjustable through voltage control, allowing the same physical element to provide different impedance values as needed for different beam steering configurations. This dynamic adaptability enables arbitrary impedance patterns to be created through control voltages rather than through complex permanent structural variations.
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 approach enables low-cost, low-complexity electronic steering in two dimensions, improving the operational bandwidth and impedance tunability of artificial impedance surface antennas, making them more suitable for cost-sensitive applications while maintaining effective radiation pattern control.
Implementation Method 1
surface waves are propagated along each of a number of surface wave channels formed in each of a plurality of radiating elements
Implementation Method 2
controlling voltages applied to switch elements connecting a plurality of impedance elements in each of the number of surface wave channels
Data Source
AI summary
A method and apparatus for electronically steering an antenna system is provided. A surface wave is propagated along each of a number of surface wave channels formed in each of a plurality of radiating elements to form a radiation pattern. Each surface wave channel in the number of surface wave channels formed in each radiating element in the plurality of radiating elements is coupled to a transmission line configured to carry a radio frequency signal using a surface wave feed in a plurality of surface wave feed associated with the plurality of radiating elements. A main lobe of the radiation pattern is electronically steered by controlling voltages applied to a plurality of switch elements connecting a plurality of impedance elements in each of the number of surface wave channels.