Base Station Radiating Element LC Circuit for Common Mode Rejection
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Solution Overview
Problem
Conventional multiband base station antennas face challenges such as increased wind loading due to large size, interaction between radiating elements of different frequency bands causing beam distortion, and manufacturing difficulties due to complex and intertwined feed networks, leading to high production costs and assembly issues.
Innovation Solution
The implementation of radiating elements with a single feed stalk printed circuit board, small dipole radiator printed circuit board, and dipole arm extensions, along with cavity phase shifter assemblies that allow pre-assembly and testing, reducing element interaction and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional multiband base station antennas use separate feed networks for different frequency bands, then each frequency band can be independently controlled, but the feed networks become complex and intertwined causing manufacturing difficulties and high production costs
Solution Approach 1:
The patent combines multiple feed networks for different frequency bands (low-band and mid-band) into a single integrated feed network structure. This single feed network uses shared components such as a common phase shifter assembly and integrated transmission lines, eliminating the need for separate intertwined feed networks while maintaining independent control capability through electronic switching and phase shifting mechanisms.
Solution Approach 2:
The feed network is designed with universal components that serve multiple frequency bands simultaneously. The phase shifter assembly and transmission lines can operate across both low-band and mid-band frequencies, allowing a single feed network structure to fulfill the functions previously requiring separate dedicated feed networks for each band.
2Adaptability or versatility
If conventional base station antennas use large size to accommodate multiple linear arrays, then coverage capability is improved, but wind loading increases
Solution Approach 1:
The antenna is divided into distinct linear arrays for different frequency bands (low-band linear array and mid-band linear array) that can be independently configured and optimized. Each linear array is a separate module with its own radiating elements and feed network connections, allowing the overall antenna structure to achieve wide coverage through spatial arrangement of segmented arrays rather than requiring a monolithic large structure.
3Adaptability or versatility
If conventional antennas have complex intertwined feed networks, then multiple frequency bands are supported, but manufacturing precision requirements increase and assembly becomes difficult
Solution Approach 1:
The phase shifter assembly and feed network components are pre-assembled and pre-tested as integrated modules before final installation in the antenna. This preliminary assembly allows for quality control and precision verification to be performed on standardized modules, reducing the precision requirements and assembly complexity during final antenna installation while maintaining multiband support capability.
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 reduces element interaction, lowers production costs, and simplifies manufacturing by enabling pre-assembly and testing, thus improving performance and reducing assembly complexity.
Implementation Method 1
integrated parallel inductor-capacitor ("LC") circuits in the ground lines that reject common mode resonance
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
A radiating element for a base station antenna comprises a feed stalk printed circuit board and a dipole radiator printed circuit board mounted on the feed stalk printed circuit board. The feed stalk printed circuit board includes a first ground line that includes a first integrated parallel LC circuit, a second ground line that includes a second integrated parallel LC circuit, a first signal trace that extends through an opening in the dipole radiator printed circuit board, and a second signal trace.