Lightweight Dielectric Lens for Cellular Antenna Weight Reduction
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Solution Overview
Problem
Current radio communication systems face challenges in increasing sectorization without significantly increasing cost, weight, and complexity, particularly with the use of lenses in cellular antennas, which can lead to higher antenna gain but are not commercially practical due to these drawbacks.
Innovation Solution
The development of lensed antennas utilizing a composite dielectric material comprising lightweight base materials with embedded conductive or high dielectric constant particles, which are designed to minimize weight, cost, and RF losses while maintaining effective beam focusing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional lenses are used in cellular antennas to increase sectorization and antenna gain, then beam focusing capability is improved, but weight, cost, and complexity increase significantly
Solution Approach 1:
The patent applies composite materials by combining a foam base material with conductive particles or high dielectric constant particles to create a lens material that achieves effective beam focusing while significantly reducing weight compared to traditional solid dielectric lenses. The foam structure provides lightweight properties while the embedded particles provide the necessary electromagnetic focusing capability.
Solution Approach 2:
The patent utilizes porous foam materials as the base structure for the lens. The foam's cellular structure provides low density and reduced weight while still maintaining the ability to focus electromagnetic beams when appropriate particles are embedded within the foam matrix, resolving the contradiction between weight and focusing capability.
2Reliability
If traditional lenses are used in cellular antennas to increase sectorization, then antenna gain is improved, but cost and manufacturing complexity increase
Solution Approach 1:
The composite foam particle structure simplifies manufacturing compared to traditional multi-layer dielectric lenses. The foam base material can be easily formed into lens shapes, and particles can be mixed in during the foam formation process, reducing manufacturing steps and complexity while maintaining antenna gain through the focused beam pattern.
Solution Approach 2:
The patent changes the physical parameters of the lens material by using foam with specific density and particle concentration to achieve the desired dielectric properties and focusing capability. This allows for easier manufacturing through parameter adjustment rather than complex structural design.
3Productivity
If more radiating elements are added to cover narrow sectors, then system capacity increases, but device complexity and space requirements increase
Solution Approach 1:
The patent uses particle-based inclusions within the foam that act as multiple scattering centers to create the beam focusing effect, replacing the need for multiple discrete radiating elements. This copying approach achieves similar functionality with a simpler structure, maintaining system capacity while reducing device complexity.
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 proposed solution enables the creation of lightweight, low-cost RF lenses with low RF losses and reduced passive intermodulation distortion, allowing for efficient beam focusing and increased sectorization without the drawbacks of traditional lens systems.
Implementation Method 1
a lens positioned to receive electromagnetic radiation from at least one of the radiating elements
Implementation Method 2
The lens comprises a plurality of blocks of a composite dielectric material... first and second sheets of a base dielectric material having a first metal sheet therebetween
Data Source
AI summary
Lensed antennas are provided that include a plurality of radiating elements and a lens positioned to receive electromagnetic radiation from at least one of the radiating elements, the lens comprising a composite dielectric material. The composite dielectric material comprises expandable gas-filled microspheres that are mixed with an inert binder, dielectric support materials such as foamed microspheres and particles of conductive material that are mixed together.