Metasurface Superstrate Layout for Compact Multiband Antenna Gain
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Solution Overview
Problem
Existing antenna radiators for base station antennas face limitations in achieving high directivity and gain due to size constraints, weight increase from dielectric layers, and performance degradation across multiple frequency bands, leading to bulky structures and narrow band operation.
Innovation Solution
A multiband antenna apparatus with a metasurface superstrate (MSS) structure is arranged inside the arms of a dipole radiating element, enhancing the performance of higher frequency bands without affecting lower frequency bands, and optimized through tunable unit cells and multiple layers to improve directivity and gain across a wide range of frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional superstrates with dielectric sheets are used to improve directivity, then directivity is improved, but weight increases drastically
Solution Approach 1:
The patent changes the fundamental parameters of the superstrate by replacing traditional dielectric sheets with a metasurface structure composed of metallic patches on a substrate. This parameter change maintains the directivity enhancement function while dramatically reducing weight, as the metasurface achieves the same electromagnetic effect with much lighter materials.
Solution Approach 2:
The patent uses composite materials by combining metallic patches with a lightweight substrate to create the metasurface superstrate. This composite structure provides the necessary electromagnetic properties for directivity enhancement without the weight penalty of traditional dielectric sheets, achieving a balance between performance and weight.
2Measurement precision
If superstrates are added to improve directivity, then directivity is improved, but the antenna structure becomes bulky
Solution Approach 1:
The patent changes the structural parameters by using a thin metasurface superstrate instead of thick dielectric layers. The metasurface achieves directivity enhancement with minimal thickness, reducing the overall volume of the antenna structure while maintaining the desired electromagnetic performance.
3Measurement precision
If traditional antenna radiators are designed to maximize KPIs, then directivity and gain are improved, but the antenna is confined to narrow band operation
Solution Approach 1:
The patent applies multi-functionality by designing the metasurface superstrate to operate effectively across multiple frequency bands. The metasurface structure is engineered with unit cells that can be tuned to provide directivity enhancement for both lower and upper frequency bands, making the antenna versatile for multiband operations rather than being limited to a single narrow band.
Solution Approach 2:
The patent introduces dynamics by making the metasurface properties可调 (tunable) through the design of unit cells with variable parameters. This allows the superstrate to adapt its electromagnetic characteristics to different frequency bands, enabling the antenna to maintain high directivity and gain across a wide bandwidth rather than being static and narrow-band limited.
4Measurement precision
If metasurfaces with dielectric sheets are used, then directivity is improved, but the antenna structure becomes complex
Solution Approach 1:
The patent simplifies the structure by changing from multiple dielectric sheet layers to a single-layer metasurface with metallic patches. This parameter change reduces the number of layers and interfaces, simplifying the overall antenna structure while maintaining the directivity enhancement function.
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 MSS structure enhances directivity and gain while maintaining performance parameters, enabling compact, cost-effective operation across multiple frequency bands without increasing weight or degrading lower frequency performance.
Implementation Method 1
A metasurface superstrate (MSS) enabled radiator for a multiband antenna apparatus
Implementation Method 2
The first dipole radiating element is configured to operate at a first frequency band and is arranged on an upper plane of a support structure
Data Source
AI summary
The present disclosure relates to multiband antenna apparatuses. An example multiband antenna apparatus includes a first dipole radiating element, a second radiating element, and a metasurface superstrate (MSS) structure. The first dipole radiating element may be configured to operate at a first frequency band and arranged on an upper plane of a support structure in a first distance to a reflector plate. The second radiating element may be configured to operate at a second frequency band and arranged on a lower plane of the support structure in a second distance to the reflector plate. The second distance is smaller than the first distance. The second frequency band is higher than the first frequency band. The MSS structure is arranged in an area inside arms of the first dipole radiating element and enhances a performance of the second radiating element.