Cavity Phase Shifter Housing With Capacitive Overlap Assembly
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Solution Overview
Problem
Existing cavity phase shifters in base station antennas are cumbersome and costly to manufacture, particularly when used in large arrays of radiating elements, due to their complex mechanical and circuit structures.
Innovation Solution
A housing for cavity phase shifters is designed with separable parts, forming a cavity that includes a first part with a U-shaped cross-section and a second part with overlapping arms, which are capacitively coupled to form a stripline transmission line, allowing for easier assembly and manufacturing, particularly using metalized plastic or sheet metal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional cavity phase shifter is used, then the phase shifting function is achieved, but the manufacturing complexity and cost increase due to complex mechanical and circuit structures
Solution Approach 1:
The housing is divided into a first part and a second part that can be separately manufactured and then assembled together. The first part includes a first base and first arms, while the second part includes a second base and second arms. This segmentation allows for simpler manufacturing of each individual part while maintaining the overall functionality of the cavity phase shifter.
Solution Approach 2:
The patent replaces complex mechanical structures with a capacitive coupling mechanism. The first arms and second arms are capacitively coupled to form the cavity, eliminating the need for complex mechanical assemblies. This substitution simplifies both the mechanical structure and the manufacturing process while maintaining the phase shifting function.
2Reliability
If a complex cavity structure is used to maintain performance, then the phase shifting performance is maintained, but the assembly difficulty and manufacturing cost increase
Solution Approach 1:
The cavity structure is segmented into multiple parts that can be manufactured separately using standard manufacturing processes. The first part and second part can be produced independently, reducing assembly difficulty and manufacturing cost while maintaining the required phase shifting performance through proper capacitive coupling design.
Solution Approach 2:
The patent uses parameter changes in the capacitive coupling design to maintain performance. By adjusting the coupling parameters between the first arms and second arms, the phase shifting performance is maintained while allowing for simpler manufacturing and assembly of the segmented housing structure.
3Strength
If traditional housing designs are used, then structural integrity is maintained, but the manufacturing complexity and assembly time increase
Solution Approach 1:
The housing is segmented into a first part and a second part that can be manufactured using efficient processes and then quickly assembled together. This segmentation improves productivity by allowing parallel manufacturing of parts while maintaining structural integrity through the capacitive coupling mechanism that connects the arms.
Solution Approach 2:
The first arms and second arms are merged through capacitive coupling to form the complete cavity structure. This merging approach maintains structural integrity while simplifying the manufacturing process, as each part can be produced separately and then combined through a straightforward assembly process.
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 manufacturing complexity and cost while maintaining performance, and can be easily integrated into base station antennas, enhancing reliability and reducing passive intermodulation interference.
Implementation Method 1
the first arms and the second arms at least partially overlap and are capacitively coupled to each other to form the first cavity of the cavity phase shifter
Implementation Method 2
forming a cavity that includes a first part with a U-shaped cross-section and a second part with overlapping arms, which are capacitively coupled to form a stripline transmission line
Data Source
AI summary
A housing for a cavity phase shifter comprises a first part that extends along the length of the cavity phase shifter and a separate second part that extends along the length of the cavity phase shifter. The first part comprises a substantially flat first base and first arms that extend from the two widthwise edges of the first base toward the second part and the second part comprises a substantially flat second base and second arms that extend from the two widthwise edges of the second base toward the first part. The first arms and the second arms at least partially overlap and are capacitively coupled to each other to form the first cavity of the cavity phase shifter.