Double-Sided PCB Phase Shifters for Compact Base Station Antennas
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Solution Overview
Problem
Modern base station antennas require efficient phase shifting mechanisms to adjust antenna beams electronically, but conventional phase shifters are bulky, costly, and complex, with increased hardware and mechanical linkage requirements, which complicates installation and calibration.
Innovation Solution
The design incorporates double-sided printed circuit boards with dual phase shifters, stacked pairs of PCBs, and a wiper assembly to adjust RF transmission paths, reducing hardware and mechanical complexity while allowing for more phase shifter assemblies to fit within a smaller space, and integrating a PING and calibration circuit board to simplify cable connections and calibration processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional phase shifters are used, then phase shifting function is achieved, but device complexity and hardware requirements increase
Solution Approach 1:
The patent combines multiple phase shifters onto a single double-sided PCB, integrating functions that traditionally required separate assemblies. The front side and back side of the PCB each host phase shifters that work together to achieve the desired phase control, reducing the number of discrete components and mechanical linkages required.
Solution Approach 2:
The patent utilizes the third dimension by implementing phase shifters on both sides of the PCB, effectively doubling the functional capacity without increasing the footprint area. This vertical stacking approach allows more phase shifters to be packed into a compact volume, reducing overall device complexity while maintaining reliability.
2Adaptability or versatility
If more phase shifter assemblies are installed, then antenna beam control is improved, but manufacturing cost increases
Solution Approach 1:
Multiple phase shifters are merged onto single double-sided PCBs, reducing the total component count and assembly complexity. This integration approach maintains full antenna beam control capability while significantly reducing manufacturing costs through fewer discrete parts and simplified assembly processes.
Solution Approach 2:
The double-sided PCB design creates a universal platform that can accommodate multiple phase shifters with different functions (e.g., azimuth control, elevation control, polarization control) on the same substrate, enabling comprehensive antenna beam control while using a standardized, cost-effective manufacturing approach.
3Ease of operation
If conventional phase shifter assemblies are used, then phase shifting is achieved, but installation and calibration difficulty increases
Solution Approach 1:
The patent replaces complex mechanical linkage systems with electronic control implemented on PCBs. Phase shifting is achieved through electronic signal processing on the board rather than through mechanical adjustments, dramatically simplifying installation and eliminating the need for complex mechanical calibration procedures.
Solution Approach 2:
The integrated PCB design with embedded phase shifters creates a self-contained unit that requires minimal external mechanical linkages or adjustments. The system is designed to be installed as a complete module, reducing the need for field calibration and simplifying the installation process while maintaining full phase shifting functionality.
4Volume of moving object
If phase shifters are positioned in compact arrangement, then space utilization is improved, but signal loss increases
Solution Approach 1:
The patent arranges phase shifters in a three-dimensional configuration on double-sided PCBs, stacking functionality vertically rather than spreading components horizontally. This compact volumetric arrangement minimizes the overall assembly size while maintaining adequate signal paths and impedance control, preventing signal loss despite the compact footprint.
Data Source
AI summary
A phase shifter assembly, suitable for a base station antenna, includes a main printed circuit board with opposing first and second primary sides. The main printed circuit board has a plurality of radio frequency (RF) transmission paths on the first primary side and a plurality of RF transmission paths on the second primary side. The phase shifter assembly also includes a first wiper arm rotatably coupled to the main printed circuit board and electrically coupled to the plurality of transmission paths on the first primary side of the main printed circuit board; and a second wiper arm rotatably coupled to the main printed circuit board and electrically coupled to the plurality of transmission paths on the second primary side of the main printed circuit board. Rearwardly extending phase shifter assemblies that are oriented perpendicular to a plane defined by a reflector within a base station antenna are also provided.