Reconfigurable Antenna Array Using Slot-Ring Structure and RF Switches
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Solution Overview
Problem
Current reconfigurable antenna arrays face challenges in adapting to different communication personalities due to limited frequency tuning range, high cost, weight, and reliability issues, as well as insufficient agility to modify multiple RF communication parameters simultaneously.
Innovation Solution
A reconfigurable antenna array using a slot-ring structure with self-similar design and RF switches, enabling continuous frequency coverage and polarization diversity, with varactors for tuning and fractal shapes for full-band instantaneous bandwidth, allowing for adaptable operation across multiple frequency bands with distinct feeding networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical actuators are used to raise or lower antenna pixels for frequency tuning, then frequency adaptability is improved, but weight and cost increase significantly
Solution Approach 1:
The patent replaces mechanical actuators with electronic switching mechanisms. Instead of physically moving antenna elements using mechanical actuators, the invention uses electronic switches to dynamically reconfigure the antenna array geometry and feeding networks, achieving frequency adaptation without mechanical motion and thus eliminating the weight penalty of actuators.
Solution Approach 2:
The patent changes electrical parameters (switch states, feeding network configurations) to achieve frequency tuning instead of changing physical parameters (antenna element positions). By altering the electrical connectivity and feeding phases, the system achieves frequency adaptability without mechanical movement.
2Adaptability or versatility
If a large number of mechanical actuators are used for pixel reconfiguration, then frequency tuning capability is improved, but reliability deteriorates due to mechanical contact issues
Solution Approach 1:
The patent eliminates mechanical contact by substituting mechanical actuators with solid-state electronic switches. This replacement removes wear, friction, and contact resistance issues associated with mechanical systems, significantly improving reliability while maintaining frequency tuning capability through electronic reconfiguration.
3Adaptability or versatility
If pixelated patch antennas are reconfigured using mechanical actuators, then frequency adaptability is improved, but tuning speed becomes slow (milliseconds)
Solution Approach 1:
The patent replaces slow mechanical actuation with fast electronic switching. Electronic switches can change state in nanoseconds to microseconds, compared to the millisecond-scale response of mechanical actuators, thereby achieving rapid frequency reconfiguration while maintaining adaptability.
4Reliability
If custom-designed antenna arrays are developed for each application, then performance for specific application is optimized, but development cost and time increase
Solution Approach 1:
The patent creates a universal antenna array platform that can be reconfigured for multiple applications through electronic switching and feeding network control. Instead of designing separate custom arrays for each application, the system achieves application-specific optimization by dynamically reconfiguring the same physical array, reducing development complexity and cost.
Solution Approach 2:
The patent introduces dynamic reconfiguration capability to a previously static antenna array. By enabling real-time changes in antenna geometry, element activation, and feeding phases through electronic switches, the system can adapt to different application requirements without requiring multiple custom-designed arrays.
5Adaptability or versatility
If pixelated patch antennas are used with switches for reconfiguration, then frequency adaptability is improved, but the voltage controller cost increases due to large quantities of switches
Solution Approach 1:
The patent merges multiple switch control functions into integrated feeding network structures. Instead of requiring independent voltage controllers for each switch, the design combines switching and feeding functions, reducing the number of control elements and simplifying the voltage controller architecture.
6Area of stationary object
If closely-spaced pixelated antenna elements are used in arrays, then aperture efficiency is improved, but mutual coupling causes scan blindness
Solution Approach 1:
The patent uses dynamic reconfiguration of element activation and feeding phases to mitigate mutual coupling effects. By selectively activating elements and adjusting their phases based on the desired scan direction, the system maintains aperture efficiency while avoiding scan blindness through adaptive beamforming techniques.
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 a flexible, cost-effective, and reliable antenna array that can adapt to various communication systems by modifying center frequency, bandwidth, polarization, and power level, reducing size, weight, and power requirements while avoiding scan blindness and grating lobes.
Implementation Method 1
A reconfigurable antenna array using a slot-ring structure with self-similar design and RF switches
Implementation Method 2
with varactors for tuning and fractal shapes for full-band instantaneous bandwidth
Data Source
AI summary
A reconfigurable antenna array capable of utilizing a common antenna aperture which can cover a wide frequency range in a continuous way. With the basic antenna element based on a slot-ring and using a self similar structure approach and RE' switches, the antenna array operates without grating lobes. The antenna array exhibits polarization diversity and single-side radiation capability. When varactors are implemented into the array, the antenna array can cover the frequency range by continuously tuning the center frequency with a relatively narrow instantaneous bandwidth.