Retro-Directive Phased Array Antenna Architecture
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Solution Overview
Problem
Conventional phased array antennas require complex calibration and cannot operate effectively at different transmit and receive frequencies, handle phase modulated signals, or steer beams towards multiple signal sources, limiting their applicability in dynamic wireless communication scenarios.
Innovation Solution
The proposed antenna system employs a retro-directive adaptive phased array antenna with a central unit and antenna modules that use phase control signals to align transmit and receive beams, eliminating the need for physical calibration and allowing operation at different frequencies and with phase modulated signals, while enabling beam steering towards multiple sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional phased array antennas use complex calibration procedures, then beam alignment precision is improved, but device complexity and operational time increase
Solution Approach 1:
The antenna system automatically determines optimal beamforming coefficients by monitoring received signal characteristics and adjusting phases without external calibration equipment or procedures. The system self-calibrates by using the received signal itself as the reference, eliminating the need for complex external calibration processes while maintaining beam alignment precision.
Solution Approach 2:
The system continuously monitors received signal characteristics (power, SNR, correlation) and uses this feedback to automatically adjust beamforming coefficients. This closed-loop feedback mechanism replaces complex open-loop calibration procedures, enabling the system to adapt to changing environmental conditions while maintaining optimal beam alignment without additional complexity.
2Adaptability or versatility
If conventional phased array antennas are designed for fixed frequency operation, then device complexity is reduced, but adaptability to different frequencies and phase modulated signals deteriorates
Solution Approach 1:
The antenna system uses universal beamforming coefficients that work across different frequencies and signal types including phase modulated signals. The system determines coefficients based on signal characteristics rather than frequency-specific calibration, enabling a single system design to handle multiple frequencies and modulation types without increasing complexity.
Solution Approach 2:
The system dynamically adapts beamforming coefficients based on real-time signal characteristics rather than being fixed for specific frequencies. The automatic adjustment mechanism allows the system to handle phase modulated signals and frequency changes by continuously optimizing coefficients according to received signal properties, providing versatility without complex frequency-specific designs.
3Adaptability or versatility
If conventional phased array antennas use fixed beam directions, then device complexity is reduced, but ability to steer beams towards multiple signal sources deteriorates
Solution Approach 1:
The system dynamically steers beams towards multiple signal sources by continuously monitoring received signal characteristics and automatically adjusting beamforming coefficients for each source. The system can track moving sources and switch between multiple sources based on signal strength and characteristics, providing adaptive beam steering without complex mechanical or electronic steering mechanisms.
Solution Approach 2:
The antenna system automatically identifies and tracks multiple signal sources by monitoring received signal characteristics and self-adjusts beamforming coefficients to steer beams towards the strongest or most important sources. This self-steering capability eliminates the need for complex external control systems while maintaining the ability to track multiple sources in dynamic environments.
4Manufacturing precision
If conventional phased array antennas require physical calibration, then manufacturing precision is improved, but ease of manufacture and deployment deteriorates
Solution Approach 1:
The antenna system performs automatic calibration by determining beamforming coefficients through signal monitoring rather than physical measurement and adjustment during manufacturing. This self-calibration approach allows standard manufacturing processes without precision alignment equipment, as the system adapts to actual physical conditions through software-based coefficient determination, greatly simplifying manufacturing and deployment.
Solution Approach 2:
The system replaces mechanical calibration procedures (physical measurement and adjustment of antenna elements) with electronic/software-based automatic coefficient determination. By substituting physical calibration mechanisms with algorithmic adjustment of beamforming coefficients, the system achieves manufacturing precision without complex mechanical processes, improving ease of manufacture and deployment.
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 solution ensures optimal alignment and quality of both inbound and outbound wireless signals without the need for complex calibration, supporting efficient communication in dynamic environments with improved signal alignment and reduced operational complexity.
Implementation Method 1
The antenna array is configured by a set of values of the control signals to apply a set of first phase shifts to the received inbound wireless signal and to apply a set of second phase shifts to a local outbound signal
Implementation Method 2
Each phasing cell is configured to apply a phase shift to the inbound signal and to apply a phase shift to the outbound signal in response to a value of a phase control signal
Data Source
AI summary
An antenna system including a retro-directive adaptive phased array antenna, comprised of a group of antenna modules. There is a phasing cell in each antenna module that adds a certain amount of phase shift to the wireless transmit and receive signals in order to generate a pair of retro-directive radiation beams, such that the wireless transmit and receive beams are aligned to each other. Each phasing cell synthesizes the phase shift values for the transmit and receive beams using only one phase shifter. Therefore, as a beam forming algorithm changes the receive beam forming coefficients (i.e. the phase shifters values) to steer the receiving beam, the transmit beam will be automatically aligned to that of receive beam for arbitrary transmit and receive frequencies.