Segmented Dipole Antenna Layout for Low-Interference Co-Location
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Solution Overview
Problem
Co-located antennas operating at different frequency bands often experience performance disturbances, particularly when a low-frequency antenna is placed in front of a high-frequency antenna, leading to issues with sidelobe performance and compactness in radar systems.
Innovation Solution
The implementation of a 'chopped dipole' antenna arrangement where the second antenna is segmented into electrically small pieces with reactive loading between them, making it 'invisible' to the first antenna, thereby minimizing disturbance and allowing for a compact, cost-effective co-location without affecting the primary antenna's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the second antenna is placed in front of the first antenna to optimize space and minimize overall size, then the compactness and area efficiency are improved, but the performance of the first antenna is disturbed due to the presence of the second antenna
Solution Approach 1:
The second antenna is divided into multiple electrically small segments or elements along its structure. This segmentation allows the antenna to maintain its low-frequency operational capability while reducing its effective radar cross-section and disturbance to the first antenna. The segmented structure creates multiple smaller scattering centers instead of one large disturbance source.
Solution Approach 2:
Different parts of the second antenna are designed with different electrical characteristics. Specifically, certain sections are made electrically small or are positioned in regions where they have minimal impact on the first antenna's illumination field. This local optimization allows the second antenna to function at its operating frequency while being substantially invisible to the first antenna.
2Adaptability or versatility
If the second antenna operates at a lower frequency band than the first antenna, then the frequency band separation is achieved, but the second antenna causes severe disturbance to the antenna pattern and sidelobe performance
Solution Approach 1:
The second antenna is divided into multiple electrically small segments or elements along its structure. This segmentation allows the antenna to maintain its low-frequency operational capability while reducing its effective radar cross-section and disturbance to the first antenna. The segmented structure creates multiple smaller scattering centers instead of one large disturbance source.
Solution Approach 2:
The electrical parameters of the second antenna are modified by making its segments electrically small relative to the wavelength of the first antenna's operating frequency. This parameter change ensures that the second antenna presents a minimal electromagnetic profile to the first antenna while maintaining its own low-frequency resonance characteristics.
3Measurement precision
If active electronically scanned antennas are used to enhance radar capabilities, then the detection and measurement capabilities are improved, but the requirement for low disturbance secondary antennas becomes more stringent
Solution Approach 1:
The second antenna is divided into multiple electrically small segments or elements along its structure. This segmentation allows the antenna to maintain its low-frequency operational capability while reducing its effective radar cross-section and disturbance to the first antenna. The segmented structure creates multiple smaller scattering centers instead of one large disturbance source.
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 maximizes power transfer and maintains operational capability for both antennas, reducing radar cross-section values and ensuring the second antenna does not disturb the first antenna's operation, while being efficient in manufacturing and size constraints.
Implementation Method 1
Each reactive load section is an inductive load section
Implementation Method 2
Each reactive load section couples an adjacent first and second electrically conductive sections
Implementation Method 3
the second antenna is segmented into a plurality of electrically small pieces with reactive loading between them, making it 'invisible' to the first antenna
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The present disclosure relates to an antenna arrangement (1) comprising a first antenna (2) configured to operate within a first frequency band and a second antenna (3) configured to operate within a second frequency band. The first frequency band is higher than the second frequency band. Further, the second antenna (3) is at least partly arranged within an illumination-field of the first antenna (2). Furthermore, the second antenna (3) comprises a dipole structure (4) segmented into a plurality of electrically conductive sections (5), wherein each electrically conductive section (5) is coupled to an adjacent electrically conductive section by a reactive load section (6).