Offset Dual-Polarization RIS Layout for Independent Beamforming
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Solution Overview
Problem
Manufacturing dual-polarized Reconfigurable Intelligent Surfaces (RISs) for wireless communication networks is challenging and costly due to the complexity of achieving separate reflection properties for two different polarizations of incident electromagnetic waves.
Innovation Solution
The use of two types of linear polarization antenna elements with parallel and offset polarization planes allows for independent control of each polarization, enabling cost-effective and efficient manufacturing by using single-polarization antenna elements, which can be arranged in a predefined pattern to achieve high cross-polarization discrimination and adaptable reflectivity properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual-polarized antenna elements are used to achieve separate reflection properties for two different polarizations, then the RIS can control reflection properties for both polarizations independently, but the manufacturing complexity and cost increase significantly
Solution Approach 1:
The RIS surface is segmented into two distinct sets of antenna elements: first antenna elements with first polarization planes and second antenna elements with second polarization planes. Each set handles a specific polarization independently, avoiding the need for complex dual-polarized elements while achieving separate control of reflection properties for both polarizations through independent adjustment of each antenna element set.
2Ease of manufacture
If single-polarization antenna elements are used instead of dual-polarized elements, then manufacturing cost and complexity are reduced, but the ability to independently control reflection properties for two polarizations may be compromised
Solution Approach 1:
The RIS system achieves multi-functionality by combining multiple sets of single-polarization antenna elements, each set capable of independently controlling reflection properties for its designated polarization. This universal approach allows the system to handle multiple polarizations simultaneously using simpler, more cost-effective single-polarization elements rather than requiring each element to handle multiple polarizations.
3Object-affected harmful factors
If antenna elements are arranged offset to each other with different polarization planes, then cross-polarization discrimination is improved, but the structural complexity of the RIS increases
Solution Approach 1:
The antenna elements are arranged with asymmetric offset positions relative to each other, where first antenna elements and second antenna elements occupy different spatial locations. This asymmetric arrangement, combined with orthogonal polarization planes, creates geometric isolation that enhances cross-polarization discrimination by minimizing coupling between elements of different polarizations while maintaining a manageable structural 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
This approach results in a more cost-efficient and easier-to-manufacture RIS with high cross-polarization discrimination, allowing for independent beamforming of electromagnetic waves with two different polarizations, enhancing network performance without affecting the reflectivity properties.
Implementation Method 1
Each of the antenna elements is configured with a reflectivity that is adaptable such that desired reflectivity properties of the reconfigurable intelligent surface are obtained
Implementation Method 2
at least one resistance of the individual antenna elements and/or at least one capacitance of the individual antenna elements may be adapted in order to obtain the desired reflection properties of the RIS
Data Source
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AI summary
A reconfigurable intelligent surface (20) for improving network performance is described. The reconfigurable intelligent surface (20) comprises a plurality of first antenna elements and a plurality of second antenna elements. The first antenna elements are linear polarization antennas having first polarization planes being parallel to each other. The second antenna elements are linear polarization antennas having second polarization planes being parallel to each other. Each of the first polarization planes intersects each of the second polarization planes. The first antenna elements and the second antenna elements are arranged offset to each other. Further, a wireless communication network (10) is described.