Multi-Radiator Reflector Connectors for Low-PIM Frequency Flexibility
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Solution Overview
Problem
The manufacturing of multi-array antennas with multiple frequency bands is challenging due to difficulties in extruding wider aluminum profiles with strict tolerances, and existing antennas are not flexible enough to accommodate different frequency range requirements from various cellular operators, leading to inventory management issues for suppliers.
Innovation Solution
A modular reflector design for multi-radiator antennas using two or more electrically conducting reflector parts interconnected via connector devices with metallic films and holding elements, providing indirect electrical connections through dielectric coatings or layers to achieve low passive intermodulation and flexibility in frequency coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single extruded aluminum profile is used to form multiple reflectors/feeding networks, then manufacturing is simplified and structural integrity is maintained, but manufacturing precision and tolerance control become difficult for wider profiles
Solution Approach 1:
The reflector is divided into multiple separate reflector parts that can be manufactured individually with standard extrusion processes and tight tolerances, then assembled together using connector devices. This segmentation allows each part to be produced within conventional manufacturing capabilities while achieving the overall complex structure.
Solution Approach 2:
Connector devices with metallic films serve as intermediary elements between separate reflector parts. These connectors provide precise electrical connections while accommodating minor dimensional variations, effectively mediating between the separate manufactured parts to achieve the required overall precision.
2Adaptability or versatility
If antennas are designed with fixed frequency band coverage, then production and inventory management are simplified, but adaptability to different operator requirements is reduced
Solution Approach 1:
The antenna system is segmented into modular components (reflector parts, feeding networks, antenna elements) that can be independently configured. This modularity enables different combinations to be assembled for various frequency band requirements without redesigning the entire system.
Solution Approach 2:
The connector devices and modular reflector parts are designed with universal interfaces and standardized dimensions, allowing the same basic components to serve multiple frequency bands and different operator configurations, thereby achieving versatility without proportionally increasing complexity.
3Reliability
If direct electrical connection between reflector parts is used, then electrical continuity is improved, but passive intermodulation increases due to galvanic connections
Solution Approach 1:
A dielectric layer is introduced as an intermediary between the metallic film and the reflector parts, creating an indirect electrical connection. This mediator maintains electrical continuity through capacitive coupling while preventing direct galvanic contact between dissimilar metals, thereby reducing passive intermodulation.
Solution Approach 2:
The direct mechanical/galvanic electrical connection is replaced with a capacitive coupling system using dielectric layers. This substitution eliminates the harmful galvanic effects while preserving the necessary electrical continuity for signal transmission.
4Adaptability or versatility
If connector devices with metallic films and dielectric layers are used to interconnect reflector parts, then passive intermodulation is reduced and flexibility is improved, but device complexity increases
Solution Approach 1:
Thin metallic films with dielectric coatings are used as flexible connector elements that can accommodate dimensional variations and assembly tolerances. These thin-film structures provide the necessary electrical connection while maintaining flexibility in the overall antenna assembly.
Solution Approach 2:
The connector devices utilize changes in dielectric properties and capacitive coupling parameters to achieve electrical connection without direct metal-to-metal contact. By controlling the dielectric layer thickness and material properties, the system achieves flexible adaptation to different configurations.
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 design allows for the creation of antennas that can cover additional frequency bands and adapt to different frequency requirements, reducing production complexities and inventory needs while maintaining high performance by separating mechanical and electrical interconnections, thus minimizing air gaps and accommodating production tolerances.
Implementation Method 1
The electrical interconnection is indirect by means of a dielectric coating or layer arranged on the metallic film and/or on the connecting portions, or by means of a dielectric film arranged between the metallic film and the connecting portions. The indirect interconnection may be capacitive.
Data Source
AI summary
A reflector for a multi-radiator antenna which comprises electrically conducting reflector parts and one or more connector device. At least two reflector parts are each provided with at least one connecting portion. At least one connector device is adapted to provide an electrical interconnection between at least two of the reflector parts. At least one connector device comprises a metallic film and one or more holding elements. The metallic film is adapted to be arranged in abutment with connecting portions of the at least two of the reflector parts to achieve the electrical interconnection. At least one of the holding elements has at least one holding portion adapted to connect to a connecting portion of a reflector part with said metallic film sandwiched therebetween. The electrical interconnection is indirect by means of a dielectric coating or layer arranged on the metallic film and/or on the connecting portions, or by means of a dielectric film arranged between the metallic film and the connecting portions.