Photoconductive Feed Network for Dynamic Antenna Beam Steering
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Solution Overview
Problem
Existing antenna systems for moving platforms lack real-time control over electronic beam steering and operational frequency band, are complex in design, and suffer from signal loss and distortion due to active circuitry and physical interconnections, making them unsuitable for conformal integration and high-frequency applications.
Innovation Solution
A reconfigurable feed network using a microstrip patchwork radiating surface with photoconductive interconnections between radiating patches and a stripline feed structure, controlled by light-emitting sources to enable or disable connections, allowing dynamic adjustment of frequency, bandwidth, and beam pointing without physical movement or significant active circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanically steering means are used for beam steering, then beam steering capability is achieved, but the system becomes too complex and unsuitable for high-dynamics applications
Solution Approach 1:
The patent replaces mechanical steering mechanisms with electronic phase-shift steering using a feed network that distributes RF signals to multiple antenna elements with controllable phase shifts. This substitution eliminates moving parts and mechanical complexity while enabling beam steering through electronic control of signal phases across the antenna array.
2Adaptability or versatility
If conformal antenna arrays are used for integration into airframe, then aerodynamic integration is improved, but the requirements for phase steering become more stringent
Solution Approach 1:
The patent implements a reconfigurable feed network that can dynamically adjust phase shifts and amplitude weights to steer beams in multiple directions and maintain optimal performance across different conformal array configurations. This multi-functional capability allows the same hardware to adapt to various integration scenarios and steering requirements without additional complexity.
3Reliability
If separate antenna arrays are used for each frequency band, then frequency-specific performance is optimized, but power, weight, and space requirements increase
Solution Approach 1:
The patent employs a dynamically reconfigurable feed network that can change its electrical characteristics in real-time to support multiple frequency bands. By using variable phase shifters and amplitude controllers, the same physical antenna array can be electronically reconfigured to operate optimally at different frequencies, eliminating the need for separate fixed-frequency arrays and reducing overall system weight.
4Device complexity
If fixed frequency band antennas are used, then design simplicity is maintained, but operational flexibility across multiple frequency bands is limited
Solution Approach 1:
The patent utilizes variable electrical parameters in the feed network, including adjustable phase shifts and amplitude weights, to reconfigure the antenna array's operational characteristics. By changing these parameters electronically, the same simple physical structure can adapt to different frequency bands and operational requirements, maintaining design simplicity while achieving frequency versatility.
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 lightweight, low-power, and cost-effective antenna system with high modulation bandwidth, capable of conformal integration and efficient operation up to 80 GHz, offering real-time control over beam steering and frequency while minimizing signal loss and distortion.
Implementation Method 1
photoconductive interconnections between radiating patches and a stripline feed structure, controlled by light-emitting sources to enable or disable connections
Data Source
AI summary
A dynamically-reconfigurable feed network antenna having a microstrip patchwork radiating surface wherein individual radiating patches and elements of a stripline feed structure can be connected to and disconnected from each other via photoconductive interconnections. Commands from software alternately turn light from light emitting sources on or off, the light or lack thereof being channeled from an underside layer of the antenna so as to enable or disable the photoconductive interconnections. The resultant connection or disconnection of the radiating patches to each other and to the stripline feed structure will vary the antenna's frequency, bandwidth, and beam pointing.