Reflectarray Antenna Multi-Band Operation
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Solution Overview
Problem
Existing reflectarray antennas are limited in their ability to concurrently transmit and receive multiple frequency bands, requiring multiple elements and increasing hardware complexity and cost.
Innovation Solution
A reflectarray antenna design featuring multiple planar surfaces with differently sized and arranged antenna conductors, allowing for the interspersed operation of separate frequency bands by configuring dipole conductors in geometric patterns on membrane layers to provide selective phase delays and emulate parabolic reflector performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate reflectarray elements are used to support multiple frequency bands, then frequency band coverage is improved, but device complexity and hardware cost increase
Solution Approach 1:
The patent combines multiple reflectarray elements into a single integrated structure that supports multiple frequency bands simultaneously. The merged reflectarray uses different regions of its surface to handle different frequency bands, eliminating the need for separate antenna elements and reducing overall system complexity while maintaining multi-band capability
Solution Approach 2:
The reflectarray is designed with multi-functional capability to operate across multiple frequency bands using a single structure. By incorporating frequency-selective surfaces and multiple feed points, the same physical structure performs multiple functions (supporting different frequency bands) rather than requiring separate dedicated elements for each band
2Adaptability or versatility
If multiple separate reflectarray elements are used to support multiple frequency bands, then frequency band coverage is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple reflectarray elements into one integrated component, reducing the total number of parts that need to be manufactured, assembled, and tested. This single-structure approach simplifies the manufacturing process and reduces material costs compared to producing and assembling multiple separate elements
Solution Approach 2:
The reflectarray structure is designed to be universal across multiple frequency bands, allowing a single manufactured component to replace multiple frequency-specific elements. This multi-functionality reduces inventory requirements and manufacturing complexity, leading to cost savings in production and deployment
3Power
If larger reflectarray surface area is used, then antenna gain is improved, but physical size and space requirements increase
Solution Approach 1:
The reflectarray employs local quality variations across its surface, with different regions optimized for different frequency bands. This allows the antenna to achieve high gain at multiple frequencies simultaneously without requiring proportionally larger surface area for each band, as each local region contributes to the overall multi-band performance
Solution Approach 2:
The patent utilizes the third dimension (depth/layering) by incorporating multiple feed points at different positions and using stacked layer structures in the frequency-selective surface. This dimensional approach allows the reflectarray to achieve enhanced gain and multi-band capability without linearly increasing the two-dimensional surface footprint
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
Enables concurrent transmission and reception of dual-band wireless signals with reduced hardware, resulting in a more compact and cost-effective communication platform.
Implementation Method 1
a reflective array (e.g., reflectarray) antenna is a class of directive antennas in which multiple driven elements are mounted in front of a ground plane designed to reflect and collimate the radio waves in a desired direction
Data Source
AI summary
A reflectarray antenna includes a plurality of antenna conductors patterned on two or more planar surfaces. The antenna conductors include a first set of antenna conductors having a geometric arrangement to beamform and radiate a first wireless signal over a first frequency band. A second set of antenna conductors have a geometric arrangement to beamform and radiate a second wireless signal over a second frequency band that is distinct from the first frequency band. The first set of antenna conductors are formed on the two or more planar surfaces to enable operation at the first frequency band. The second set of antenna conductors are formed on the two or more planar surfaces to enable the second frequency band.