Shielded Mushroom Antenna Structure for Triple Polarization Isolation
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Solution Overview
Problem
Existing dual-band multi-port antennas struggle with limited polarization diversity, high profile, small frequency ratio, and port isolation issues, which restrict their ability to fully utilize frequency and polarization diversity in communication systems.
Innovation Solution
A compact dual-band triple-polarized antenna is designed using shielded mushroom structures with vertically and horizontally polarized radiators, featuring multilayer dielectric substrates and metallic shorting pins, allowing for simultaneous vertical and dual horizontal polarization radiation characteristics in two frequency bands, with a low profile and high port isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-port antenna supports distinct patterns and polarizations in two frequency bands, then diversity characteristics are realized, but the profile becomes high and the frequency ratio is limited
Solution Approach 1:
The patent embeds the horizontally-polarized radiator inside the vertically-polarized radiator structure. The horizontal radiator is positioned within the vertical radiator's housing, allowing both radiators to occupy the same spatial envelope. This nesting approach enables dual-band triple-polarized diversity characteristics while maintaining a low profile, as the nested configuration eliminates the need for stacked arrangements that would increase the overall height.
2Adaptability or versatility
If shielded mushroom structures are used to achieve triple polarization, then polarization diversity is improved, but the device complexity increases
Solution Approach 1:
The shielded mushroom structure serves multiple functions simultaneously: it provides the radiating elements for both vertical and horizontal polarizations, acts as the shielding structure, and forms the overall antenna housing. The vertical radiator and horizontal radiator share the same structural framework and dielectric substrate, eliminating the need for separate support structures and reducing overall device complexity despite achieving triple-polarization diversity.
3Volume of moving object
If vertically and horizontally polarized radiators are integrated in a disc-shaped structure, then compactness is achieved, but port isolation becomes challenging
Solution Approach 1:
The dielectric substrate acts as an intermediary between the vertically-polarized radiator and horizontally-polarized radiator. This dielectric layer provides electrical isolation while maintaining structural integration, allowing the two radiators to be closely positioned for compactness while preventing excessive coupling between ports. The dielectric material's properties are selected to optimize both isolation and radiation performance.
Data Source
AI summary
A compact dual-band triple-polarized antenna based on shielded mushroom structures includes a vertically-polarized radiator and a horizontally-polarized radiator. Two parts are fixedly connected in a disc-shaped structure. The vertically-polarized radiator and the horizontally-polarized radiator are both multilayer structures. Each multilayer structure includes a plurality of concentric circles, and the plurality of concentric circles include a plurality of dielectric substrates. The vertically-polarized radiator and horizontally-polarized radiator each include a plurality of shielded mushroom cell structures. Each shielded mushroom cell structure includes at least three metal layers and a metallic shorting pin, and the metallic shorting pin connects at least two of the at least three metal layers. By controlling dispersion properties of the each shielded mushroom cell structure, a multi-frequency pattern diversity device possessing both vertical polarization and dual horizontal polarization radiation characteristics in two pre-defined frequencies is designed.