Photonic Integrated Antenna Beamforming for Multi-Band RF Steering
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Solution Overview
Problem
Current antenna systems face challenges in supporting multiple radio-frequency bands simultaneously, are bandwidth limited, and incur high costs due to the need for complex beamforming phase arrays and large antenna arrays, especially when expanded to support more-than 64 antenna elements.
Innovation Solution
A wireless photonic integrated solution using a wavelength selection switch (WSS)-based optical-switching network coupled to a millimeter wave or microwave lens, enabling centralized control, true-time delay, reduced insertion loss, and larger operation bandwidth, allowing for multiple beams to be radiated and steered independently across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex beamforming phase arrays and large antenna arrays are used to support multiple radio-frequency bands, then the system can achieve multi-frequency coexistence and broader bandwidth, but the device complexity and cost increase significantly
Solution Approach 1:
The patent replaces traditional electrical beamforming phase arrays with a photonic-based system using optical switches and photodetectors. This substitution eliminates the need for complex electrical phase shifters and移相 networks, significantly reducing device complexity while maintaining multi-frequency support capabilities through optical domain signal processing
Solution Approach 2:
The photonic integrated circuit platform provides universal functionality by using a single optical switch matrix that can handle multiple radio-frequency bands simultaneously. The system achieves multi-frequency coexistence through wavelength division multiplexing and optical switching, allowing one unified structure to serve multiple frequency bands without requiring separate beamforming networks for each band
2Productivity
If the antenna array is expanded to support more than 64 antenna elements, then the bandwidth and coverage are improved, but the cost and system complexity increase
Solution Approach 1:
The patent replaces complex electrical signal distribution networks with photonic signal processing. Optical switches and photodetectors in the photonic integrated circuit handle signals from 64+ antenna elements with lower loss and higher bandwidth capability, eliminating the need for bulky electrical phase shifters and reducing overall system complexity
Solution Approach 2:
The patent transitions from electrical domain to optical domain for signal processing. By using optical frequencies and photonic integrated circuits, the system achieves higher bandwidth and lower loss signal distribution across 64+ antenna elements, effectively adding a new dimension (optical domain) to solve the bandwidth-complexity tradeoff
3Device complexity
If traditional electrical beamforming systems are used, then the system structure is straightforward, but insertion loss is high and operation bandwidth is limited
Solution Approach 1:
The patent substitutes electrical signal distribution with photonic signal processing. Optical switches exhibit lower insertion loss compared to electrical phase shifters and power splitters. The photodetector array converts optical signals to electrical signals at the antenna elements, maintaining signal integrity and reducing cumulative loss across the 64+ element array
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 simplifies wireless systems with multi-frequency coexistence, reduces the cost of beamforming systems, and supports multiple carriers across a large frequency range, enabling efficient and cost-effective ultra-wideband RF beamforming.
Implementation Method 1
a plurality of photodetectors (PD), each photodetector having an optical PD input coupled to one or more of said plurality of optical WSS outputs and a corresponding electrical output
Data Source
AI summary
A radio frequency (RF) beam transmission component having optical inputs and electrical outputs may include a wavelength selective switch (WSS) that has a plurality of optical WSS outputs. Each optical WSS output may be configured to transmit one or more wavelengths of the incoming optical signals. The RF beam transmission component may include a plurality of photodetectors (PD), each photodetector having an optical PD input coupled to one or more of said plurality of optical WSS outputs and a corresponding electrical output of a plurality of PD electrical outputs. The RF beam transmission component may further include a lens that has a plurality of electrical inputs and each electrical input may be electrically coupled to at least one of the plurality of electrical PD outputs. The lens may further have a plurality of electrical lens output ports.