Parametric Flat Lens Beam Scanning With Conversion Gain
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional antenna array systems face challenges in achieving efficient and reconfigurable focused beam scanning due to high ohmic losses, complex and costly front-end modules, and limited power efficiency, particularly in phased array systems and conventional flat lenses.
Innovation Solution
A parametric flat lens system utilizing parametric mixing circuitry in each antenna element to achieve conversion gain and reduce radiation efficiency losses, allowing for electronic beam steering and focusing with low-cost, simple architectures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phased array systems are used for beam scanning, then beam scanning capability is achieved, but device complexity and manufacturing cost increase due to complex front-end modules
Solution Approach 1:
The patent replaces the complex electronic beam scanning mechanism of phased arrays with a geometric optical approach using a flat lens. The lens physically directs beams to different focal points through its structure, eliminating the need for complex phase shifters and control electronics at each antenna element. This substitution of mechanical/geometric focusing for electronic phase control reduces front-end complexity while maintaining beam scanning capability.
2Adaptability or versatility
If conventional flat lenses are used for beam focusing, then beam focusing capability is achieved, but power efficiency deteriorates due to significant ohmic loss
Solution Approach 1:
The patent changes the operating parameters of the lens elements by using active electronic components (varactor diodes, FETs) that can dynamically adjust their electrical properties. This allows the lens to achieve beam focusing through electrically controllable phase modulation rather than relying on passive metallic structures that cause ohmic losses. The active components enable efficient beam steering and focusing by changing electrical parameters rather than dissipating energy as heat.
3Shape
If reflect array antennas are used for planar beam focusing, then planar structure is achieved, but power efficiency deteriorates due to ohmic losses and manufacturing difficulty
Solution Approach 1:
The patent employs composite structures at the antenna element level, combining radiating elements with active electronic components (varactor diodes, FETs, resistors, capacitors) integrated in a planar configuration. This composite approach allows the maintenance of a flat planar geometry while replacing lossy metallic reflect surfaces with active electronic phase control, thereby reducing ohmic losses and improving power efficiency without sacrificing the planar form factor.
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 parametric flat lens enables efficient beam-focusing and beam-scanning with moderate conversion gain, reducing costs and complexity, and achieving aperture efficiencies of -0.5 dB for near-field and -1.3 dB for far-field operations, while maintaining low ohmic losses.
Implementation Method 1
Based on the phase characteristics of parametric mixing, a parametric lens can diffract the near field to form a focused image or steer the far field electronically toward a focal point.
Data Source
AI summary
Parametric flat lenses, which are an alternative to conventional flat lenses, are described for performing near-field imaging and electronic beam scanning. These lenses can electronically direct the near or far fields, and in some cases even achieve a conversion gain. The lens incorporates a plurality of input and output antennas between which are a plurality of parametric mixers. The parametric mixers can be utilized as well to change phase relationships in accommodating different input pattern or directing the output in different ways. The disclosure also describes a proof of concept implementation using off the shelf components.