Bent Radiator Arm Layout for Stable Twin-Beam Base Station Antennas
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Solution Overview
Problem
Conventional twin-beam base station antennas face challenges such as increased size, weight, and cost due to the use of RF lenses or beamforming networks, and significant variations in beam pointing angles and beamwidths across frequency bands, leading to undesirable power levels and cross polarization distortion.
Innovation Solution
The design incorporates vertically-staggered vertical columns of radiating elements with bent metal radiator arms, featuring tip portions that protrude in different directions, providing increased spacing and reduced mutual coupling, thereby improving antenna performance and reducing cross polarization distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RF lenses or beamforming networks are used to achieve twin-beam antenna functionality, then sector-splitting coverage is improved, but device size, weight, and cost increase
Solution Approach 1:
The patent extracts and eliminates the RF lens or beamforming network from the antenna system. Instead of using these complex external components, the invention integrates the twin-beam functionality directly into the radiating element structure itself through the bent arm configuration, thereby reducing device size while maintaining sector-splitting coverage capability
Solution Approach 2:
The patent merges the functions of the RF lens/beamforming network with the radiating element structure. The bent arm configuration combines the radiation function with the beam-forming function in a single integrated structure, eliminating the need for separate components and reducing overall device complexity
2Power
If conventional radiating elements are used in vertical columns, then antenna gain is improved, but mutual coupling between adjacent columns increases
Solution Approach 1:
The patent applies asymmetry by bending the radiating arms at specific angles and orientations. The bent arms are configured with different orientations in different directions, creating an asymmetric structure that reduces mutual coupling between adjacent columns while maintaining the vertical column arrangement for gain performance
Solution Approach 2:
The patent uses curvature by bending the radiating arms into curved or angled configurations rather than using straight arms. This curvature changes the current distribution and radiation pattern, reducing the coupling between adjacent elements while preserving the antenna gain through proper geometric design
3Ease of manufacture
If straight radiator arms are used, then manufacturing is simplified, but cross polarization distortion increases
Solution Approach 1:
The patent uses asymmetric bending of the radiator arms where the arms are bent at specific angles and in specific directions to control the polarization characteristics. This asymmetric configuration reduces cross-polarization distortion while maintaining manufacturability through standardized bending processes
Solution Approach 2:
The patent changes the geometric parameters of the radiator arms by introducing bends at specific angles and positions. This parameter modification optimizes the polarization performance and reduces cross-polarization distortion while the bending process remains compatible with standard manufacturing techniques
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
The design achieves consistent antenna beamwidth and pointing angles across frequency bands, reducing mutual coupling and cross polarization distortion, while maintaining a compact form factor and improving directivity.
Implementation Method 1
providing increased spacing and reduced mutual coupling, thereby improving antenna performance and reducing cross polarization distortion
Implementation Method 2
vertically-staggered vertical columns of radiating elements that are on a surface of the reflector and are configured to transmit RF signals in a frequency band
Data Source
AI summary
Twin-beam base station antennas are provided. A twin-beam base station antenna includes a plurality of vertical columns of radiating elements that are configured to transmit radio frequency signals in a frequency band. The radiating elements have bent metal radiator arms including tip portions that face respective center axes of the radiating elements.