Multi-Band Base Station Antennas With Broadband Decoupling Elements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-band base station antennas face challenges in reducing signal scattering between different frequency bands, which affects antenna beam shape, beamwidth, and gain, making it difficult to compensate for these effects across various frequencies.
Innovation Solution
The design incorporates radiating elements with dipole arms that are transparent to specific frequency bands, allowing for closer positioning of linear arrays without degrading RF performance, by using widened and narrowed sections to create high impedance for unwanted frequency bands, and dual-polarized configurations to reduce coupling between arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple linear arrays of radiating elements are deployed to support multiple frequency bands, then the number of supported frequency bands increases, but the antenna width and device complexity increase
Solution Approach 1:
The patent positions linear arrays of radiating elements in three-dimensional space with specific spacing and orientation, transitioning from a single-plane arrangement to a multi-dimensional configuration. This allows multiple frequency bands to be supported while controlling the projected width of the antenna structure.
Solution Approach 2:
The antenna system is divided into multiple linear arrays, each dedicated to specific frequency bands. These segmented arrays are positioned at different locations and orientations, allowing independent optimization of each array while achieving multi-band support overall.
2Area of stationary object
If linear arrays are positioned closer together to reduce antenna width, then the antenna width decreases, but signal scattering and coupling between arrays increase
Solution Approach 1:
Different regions of the antenna structure are designed with different properties. The spacing and orientation between linear arrays are locally optimized based on the frequency bands they support, allowing closer positioning in some areas while maintaining isolation in others through strategic arrangement.
Solution Approach 2:
The patent uses carefully designed spacing and angular orientation between linear arrays as an intermediary mechanism to reduce coupling. By positioning arrays at specific angles and distances, the structure naturally minimizes signal scattering between adjacent arrays without requiring additional shielding or isolation materials.
3Adaptability or versatility
If different linear arrays are used for different frequency bands, then frequency band support increases, but the number of radiating element arrays and device complexity increase
Solution Approach 1:
Each linear array is designed with universal characteristics that allow it to contribute to multiple frequency bands, though with optimized performance for its primary band. The arrays use similar structural designs and can be configured in different orientations to serve different bands, reducing the need for completely distinct array designs for each frequency.
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 approach enables the reduction of antenna width, decreases coupling between radiating elements, and maintains RF performance, allowing for more compact and efficient multi-band base station antennas that support multiple frequency bands without distorting antenna patterns.
Implementation Method 1
The first dipole arm is configured to be more transparent to RF signals in a second frequency band than it is to RF signals in a third frequency band, and the second dipole arm is configured to be more transparent to RF signals in the third frequency band than it is to RF signals in the second frequency band
Data Source
AI summary
Radiating elements include a first and second dipole arms that extend along a first axis and that are configured to transmit RF signals in a first frequency band. The first dipole arm is configured to be more transparent to RF signals in a second frequency band than it is to RF signals in a third frequency band, and the second dipole arm is configured to be more transparent to RF signals in the third frequency band than it is to RF signals in the second frequency band. Related base station antennas are also provided.