Antenna Arrangement With Iris Disc For Polarization Isolation
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Solution Overview
Problem
Conventional antenna arrays face challenges in achieving dense packing, low directivity, low inter-element coupling, and frequency rejection while maintaining polarization orthogonality and cost-effectiveness, especially in densely populated wireless communication areas.
Innovation Solution
The proposed antenna arrangement incorporates a design with electrically conductive discs and a housing that includes feeding and transmitting means to control frequency selectivity and polarization properties, allowing for dual polarized operation and reduced load pulling, utilizing a compact configuration with symmetrical and axially symmetric elements for improved inter-cardinal polarization isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If antenna elements are densely packed to achieve beam forming with controlled side lobes, then array density is improved, but inter-element coupling increases causing load pulling between elements
Solution Approach 1:
A frequency selective surface (FSS) is introduced as an intermediary layer between adjacent antenna elements. This FSS acts as a spatial filter that blocks electromagnetic coupling between elements while allowing desired radiation patterns. The FSS is positioned at a distance from the radiating elements and is designed with specific resonant frequencies to provide isolation without affecting the main beam forming operation.
Solution Approach 2:
The antenna elements are designed with non-uniform amplitude distributions across the array aperture. Elements at different positions have different excitation amplitudes to compensate for edge effects and reduce coupling. This local optimization of element characteristics helps maintain low side-lobe levels while enabling dense packing for beam forming capability.
2Reliability
If traditional filters are added to achieve frequency rejection, then frequency selectivity is improved, but device complexity and space requirements increase
Solution Approach 1:
The frequency selective surface is merged with the ground plane structure of the antenna array. Instead of adding separate filter components, the FSS is integrated into the existing ground plane layer, serving dual purposes: providing frequency rejection for out-of-band signals and maintaining the reference ground for antenna operation. This integration eliminates additional components and simplifies the overall device structure.
Solution Approach 2:
The frequency selective surface performs multiple functions simultaneously: it provides frequency rejection for out-of-band signals, acts as a reflector to enhance radiation efficiency, and serves as a shielding layer to reduce inter-element coupling. This multi-functionality eliminates the need for separate components for each function, reducing overall device complexity.
3Reliability
If polarization orthogonality is maintained across wide angles, then polarization isolation is improved, but antenna element directivity increases reducing scanning flexibility
Solution Approach 1:
The antenna array employs three-dimensional beam forming by controlling both amplitude and phase of multiple radiating elements. Instead of relying on high directivity in a single plane, the system uses spatial distribution of elements in three dimensions to achieve polarization isolation while maintaining low directivity in any single direction. This enables flexible scanning in multiple directions while preserving polarization orthogonality.
4Ease of manufacture
If cost-effective printed antenna elements are used, then manufacturing cost is reduced, but frequency selectivity and Q factor are limited
Solution Approach 1:
The frequency selective surface acts as an intermediary that enhances the frequency selectivity of the overall antenna system without requiring the printed antenna elements themselves to have high Q factors. The FSS provides the necessary frequency filtering capability, allowing the use of simple, low-cost printed antenna elements while maintaining high frequency rejection performance.
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 enables efficient frequency filtering and reduced load pulling, enhancing inter-element isolation and radiation properties, while maintaining polarization orthogonality and supporting differential feeding architectures, thus addressing the limitations of traditional antenna arrays.
Implementation Method 1
the third electrically conductive disc comprises four openings to form an iris between two cavities, the two cavities being configured to support two orthogonal linearly polarized modes
Implementation Method 2
the two cavities being configured to support two orthogonal linearly polarized modes
Implementation Method 3
the four openings are configured symmetrically to ensure no coupling between the orthogonal linearly polarized modes of the two cavities
Implementation Method 4
feeding means configured to feed electromagnetic energy to the first electrically conductive disc
Implementation Method 5
transmitting means configured to transmit electromagnetic energy from the second electrically conductive disc
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2a~2b
AI summary
An antenna arrangement (100) is described which comprises an electrical conductor (102) extending along an axis (104), a first electrically conductive disc (106) in contact with the electrical conductor (102) and extending perpendicularly from the axis (104), a second electrically conductive disc (108) in contact with the conductor (102) and extending perpendicularly from the axis (104). The antenna arrangement also comprises an electrically conductive housing (110) enclosing, circumferentially around the axis (104), the electrical conductor (102), the first electrically conductive disc (106) and the second electrically conductive disc (108), feeding means (114) configured to feed electromagnetic energy to the first electrically conductive disc (106), transmitting means (1 16) configured to transmit electromagnetic energy from the second electrically conductive disc (108), and a third electrically conductive disc (112) in contact with the conductor (102) and extending perpendicularly from the axis (104) between the first electrically conductive disc (106) and the second electrically conductive disc (108) at a distance therefrom. The third electrically conductive disc (112) comprises at least one opening (128).