Cross Dipole Feed Structure for Higher Polarization Isolation
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Solution Overview
Problem
Existing dual-polarized cross dipoles in mobile communication antennas face challenges in achieving high isolation between polarizations, which is essential for compact design and high data rates, with current solutions offering less than optimal port-to-port isolation.
Innovation Solution
The design incorporates a dipole radiator with a specific carrier and signal feeding structure arrangement, including support and wing sections, and a signal feeding structure that enhances port-to-port isolation by capacitive coupling and symmetrical architecture, achieving isolation of about 30 dB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual-polarized cross dipole uses a conventional signal feeding structure, then the device complexity is reduced, but the port-to-port isolation between polarizations deteriorates (less than 30 dB)
Solution Approach 1:
The signal feeding structure transitions from a planar configuration to a three-dimensional arrangement that utilizes the space between the support sections. The feed section extends between support sections in a direction substantially perpendicular to their inner sides, creating spatial separation that enhances isolation between polarizations while maintaining a compact overall structure.
2Reliability
If the antenna elements are arranged compactly to achieve high data rates, then the area is reduced, but the isolation between polarizations deteriorates
Solution Approach 1:
The invention achieves enhanced isolation within a compact footprint by utilizing the third dimension - the space between support sections. The feed section extends perpendicular to the inner sides of support sections, creating vertical separation that improves polarization isolation without increasing the horizontal area occupied by the antenna element.
Solution Approach 2:
The signal feeding structure is nested within the space formed by the support sections. The feed section is positioned between the support sections and extends in a direction that utilizes the available space efficiently, allowing the isolation-enhancing structure to be contained within the existing antenna element footprint rather than requiring additional area.
3Reliability
If the feed section is arranged closer to the inner side of the first carrier support section, then the port-to-port isolation is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The feed section has varying width along its length, with the first width in the region closer to the first support section being different from the second width in the region closer to the second support section. This gradual transition in dimensions provides mechanical tolerance compensation, reducing the impact of positioning variations on overall performance while maintaining the isolation benefits of the asymmetric arrangement.
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 configuration results in improved port-to-port isolation and a compact design, enhancing the performance of dual-polarized cross dipoles in mobile communication antennas by increasing the isolation between polarizations.
Implementation Method 1
The signal feeding structure comprises a feed section, a connecting section and an end section. The feed section of the signal feeding structure extends between the support sections of the first and the second carriers along the inner side of the support section of the first carrier
Data Source
AI summary
Dipole radiator comprising a first and second carrier and a signal feeding structure. The first and second carriers comprise a sup-port sections with a first and second end and a wing sections. The support sections of the first and second carriers each comprise an inner side which face each other and an opposite outer side. The signal feeding structure comprises a feed section, a connecting section and an end section. The feed section runs along the inner side of the support section goes into the connection section which goes into the end section. The end section runs along the out-er side of the support section of the second carrier.