Mixed-Order Bandpass FSS Lens for Millimeter-Wave Antennas
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Solution Overview
Problem
Current millimeter-wave frequency band antennas face limitations in gain and beam steering capabilities, and existing lens technologies are bulky, costly, and complex due to multiple metal and dielectric layers, leading to high losses and fabrication challenges.
Innovation Solution
The development of a mixed-order bandpass frequency selective surface (FSS) lens with a single substrate and two metal layers, featuring a central portion with conductive elements of different structures on opposite sides and an outer portion with the same structure, reducing the number of layers and simplifying design while maintaining phase shift targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple metal and dielectric layers are used in lens construction, then filtering capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple filtering functions into a single FSS layer with mixed-order bandpass filters, eliminating the need for separate metal and dielectric filtering layers. This merging maintains the required filtering capability while significantly reducing the overall layer count and structural complexity of the lens system.
Solution Approach 2:
The FSS layer serves multiple functions simultaneously: it acts as both the filtering element and the phase-shifting element. By integrating these functions into a single component with mixed-order bandpass characteristics, the patent eliminates redundant layers and simplifies the overall lens construction while maintaining performance.
2Reliability
If multiple metal and dielectric layers are used in lens construction, then filtering capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple filtering functions into a single FSS layer with mixed-order bandpass filters, eliminating the need for separate metal and dielectric filtering layers. This merging maintains the required filtering capability while significantly reducing the overall layer count and structural complexity of the lens system.
Solution Approach 2:
The FSS layer serves multiple functions simultaneously: it acts as both the filtering element and the phase-shifting element. By integrating these functions into a single component with mixed-order bandpass characteristics, the patent eliminates redundant layers and simplifies the overall lens construction while maintaining performance.
3Reliability
If multiple metal and dielectric layers are used in lens construction, then filtering capability is improved, but lens thickness and weight increase
Solution Approach 1:
The patent combines multiple filtering functions into a single FSS layer with mixed-order bandpass filters, eliminating the need for separate metal and dielectric filtering layers. This merging maintains the required filtering capability while significantly reducing the overall layer count and structural complexity of the lens system.
Solution Approach 2:
The patent extracts and eliminates redundant metal and dielectric layers from the traditional multi-layer lens construction. By removing these unnecessary layers and retaining only the essential FSS layer with mixed-order bandpass filters, the lens thickness and weight are significantly reduced while filtering capability is preserved.
4Reliability
If multiple metal and dielectric layers are used in lens construction, then filtering capability is improved, but energy loss increases
Solution Approach 1:
The patent combines multiple filtering functions into a single FSS layer with mixed-order bandpass filters, eliminating the need for separate metal and dielectric filtering layers. This merging maintains the required filtering capability while significantly reducing the overall layer count and structural complexity of the lens system.
Solution Approach 2:
The patent converts the traditional approach of using multiple lossy metal and dielectric layers into a single FSS layer design. By eliminating the interfaces and redundant materials that cause energy loss, the mixed-order bandpass FSS lens reduces transmission loss while maintaining effective filtering capability.
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 solution reduces the number of metal and dielectric layers, lowering costs, thickness, and weight, while enhancing antenna gains, directivity, and reducing losses, enabling more efficient wireless communication systems with improved signal-to-noise ratios and beam steering capabilities.
Implementation Method 1
a lens with a spatial mixed-order bandpass filter... a mixed-order frequency selective surface, FSS
Implementation Method 2
transmitting electromagnetic waves through a lens comprising a plurality of layers of conductive elements and a substrate layer
Data Source
Figure 1~2
Figure 3~5
Figure 6a~7b
AI summary
An apparatus includes a plurality of layers of conductive elements and a substrate layer. A first of the layers of conductive elements has a first portion that includes conductive elements having a first structure different from a second structure of conductive elements in a second portion of the first layer. The first layer can be in contact with one side of the substrate layer. Conductive elements in a second of the layers of conductive elements can be in contact with another side of the substrate layer. The lens may include a first type of unit cell including at least one conductive element having the first structure and conductive elements having the second structure positioned on different sides of the substrate layer. The first type of unit cell may provide a capacitively-loaded bandpass filter response, and a second type of unit cell may provide a bandpass filter response.