Phase Shifter Slider Impedance Layout for Lower Antenna Sidelobes
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Solution Overview
Problem
Existing base station antennas face challenges in reducing sidelobe levels and managing impedance in phase shifters, leading to potential passive intermodulation distortion and manufacturing difficulties due to narrow impedance conversion line widths.
Innovation Solution
The proposed solution involves a slider with an impedance conversion line that includes a series portion and a parallel portion connected in series, allowing for adjustable impedance without relying on line width changes, thereby enhancing the magnitude taper and reducing passive intermodulation distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the line width of the impedance conversion line is reduced to increase impedance, then the magnitude taper increases and sidelobe levels are reduced, but the risk of passive intermodulation distortion increases and manufacturing becomes more difficult
Solution Approach 1:
The impedance conversion line is divided into multiple segments with different impedance values. Instead of using a single narrow line, the line is segmented into multiple sections, each with optimized impedance, allowing the overall impedance to be increased without requiring the entire line to be narrow, thus avoiding manufacturing difficulties while achieving the desired magnitude taper.
Solution Approach 2:
Different sections of the impedance conversion line are assigned different local impedance values optimized for their specific function. The line transitions from lower impedance sections to higher impedance sections, with each section having locally optimized characteristics. This allows the impedance to be increased in specific regions without requiring the entire line to be narrow, reducing manufacturing difficulty while maintaining reliability.
2Reliability
If the line width of the impedance conversion line is reduced to increase impedance, then the magnitude taper increases, but the risk of passive intermodulation distortion increases
Solution Approach 1:
The impedance conversion line is segmented into multiple sections with progressively increasing impedance values. This segmentation allows the magnitude taper to be achieved through the progressive impedance change across sections rather than through a uniformly narrow line, thereby reducing the risk of passive intermodulation distortion while maintaining the required magnitude taper.
Solution Approach 2:
The impedance parameter of the conversion line is changed progressively across different sections rather than maintaining a uniformly high impedance through narrow width. By varying the impedance parameter section by section, the magnitude taper is achieved without requiring narrow line widths that would generate passive intermodulation distortion.
3Reliability
If the impedance conversion line uses a narrow width to achieve desired impedance, then the magnitude taper is sufficient, but the power handling capability is reduced due to high power levels in sub-components
Solution Approach 1:
The impedance conversion line is divided into multiple sections that progressively transform the impedance. This segmentation distributes the power handling requirements across multiple wider sections rather than concentrating them in a single narrow line, allowing sufficient power handling capability while achieving the necessary magnitude taper through the progressive impedance transformation.
Solution Approach 2:
Different sections of the impedance conversion line are designed with locally optimized width and impedance values. Sections with lower power levels can have higher impedance, while sections with higher power levels maintain wider widths for better power handling. This local optimization allows the magnitude taper to be achieved without compromising power handling capability.
Data Source
AI summary
A slider includes: a first coupling section; a second coupling section; and an impedance conversion line, which is connected between the first coupling section and the second coupling section, and includes a series portion and a parallel portion connected in series, wherein the series portion includes only one first connection line, and the parallel portion includes at least two second connection lines connected in parallel.