Active Metasurface Antennas With Distributed LNAs and PAs
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Solution Overview
Problem
Existing metasurface antennas are passive, requiring bulky central amplifiers that increase height, generate heat, and incur high costs due to expensive components, leading to signal loss and reduced Gain-to-Noise Temperature ratio.
Innovation Solution
Incorporating low noise amplifiers (LNAs) and power amplifiers (PAs) directly into the metasurface to amplify signals before and after modulation, respectively, reducing the need for central amplifiers and minimizing signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If central RF chains are used to amplify signals, then signal amplification is achieved, but the height profile increases and heat generation becomes significant
Solution Approach 1:
The patent divides the central RF chain into distributed amplifier elements integrated across multiple metasurface antenna elements. Each element contains its own amplifier (LNA for receive, PA for transmit), transforming a centralized high-power amplification system into distributed low-power amplification units that generate less heat locally and reduce overall height profile requirements.
2Power
If central RF chains are used, then signal amplification is provided, but system cost increases significantly
Solution Approach 1:
The patent replaces expensive central RF chain components with multiple lower-cost integrated amplifier elements distributed across the metasurface. The distributed architecture using standard semiconductor fabrication processes reduces per-element cost, making the overall system more cost-effective despite using multiple elements instead of a single centralized system.
3Ease of operation
If signals pass through passive antenna and feeding network before amplification, then signal routing is achieved, but signal loss increases and noise temperature rises
Solution Approach 1:
The patent implements preliminary amplification by placing LNAs immediately after individual antenna elements in the receive path, before signals pass through the feeding network. This early amplification boosts weak received signals before they undergo lossy transmission through feed lines and power dividers, reducing the impact of subsequent losses and lowering the effective noise temperature of the receive path.
4Ease of manufacture
If passive metasurface architecture is used, then manufacturing simplicity is maintained, but gain and noise performance are compromised
Solution Approach 1:
The patent merges passive metasurface antenna elements with active amplifier components into integrated units. Each metasurface element is combined with an LNA (receive) or PA (transmit) in a monolithic or hybrid integrated structure, maintaining the planar geometry and manufacturing simplicity of passive metasurfaces while adding active amplification functionality to improve gain and noise performance.
Data Source
AI summary
Antennas and methods for using the same are disclosed. In some embodiments, an antenna includes a metasurface having radiating antenna elements and amplifiers configured to amplify signals for the radiating antenna elements, wherein, for each of the radiating antenna elements, the metasurface includes one or both of: a receive path having a low noise amplifier (LNA) configured to amplify a first set of received signals, at least one radiating antenna element configured to receive the first set of received signals, and a transmit path having a power amplifier (PA) configured to amplify a second set of transmit signals, the second set of transmit signals to be transmitted from the one radiating antenna element.