Asymmetric Wilkinson Power Splitter Layout With Open Stub Compensation
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Solution Overview
Problem
Multistage Wilkinson-type power splitter-combiners have a large footprint and increased loss due to symmetric quarter-wave line configurations and connection wiring.
Innovation Solution
A power splitter-combiner design with a shorter second transmission line and optional open stubs, allowing for flexible layout and eliminating the need for connection wiring, with the open stubs compensating for the electrical length difference and maintaining ideal characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If symmetric quarter-wave line configuration is used in multistage Wilkinson-type power splitter-combiners, then the power distribution characteristics are maintained, but the footprint area becomes large
Solution Approach 1:
The patent applies asymmetry by making the second transmission line shorter than the first transmission line, and connecting open stubs to compensate for the electrical length difference. This asymmetric configuration maintains the required power distribution characteristics while reducing the overall footprint area compared to symmetric quarter-wave line configurations.
Solution Approach 2:
The patent changes the parameters of the transmission lines by setting different lengths for the first and second transmission lines, and adjusting the electrical characteristics through open stubs. This parameter modification allows the device to achieve the same functional performance with a smaller physical footprint.
2Device complexity
If connection wiring is used to connect multiple Wilkinson-type power splitter-combiners, then the multistage structure is formed, but the loss amount increases
Solution Approach 1:
The patent merges the output of the first power splitter-combiner directly with the input of the second power splitter-combiner by making their physical positions coincide, eliminating the need for separate connection wiring. This merging approach reduces the loss amount while maintaining the multistage structure.
Solution Approach 2:
The patent uses the same structural configuration for multiple stages, where each stage consists of a power splitter-combiner with asymmetric transmission lines and open stubs. This copying of the optimized single-stage design to multiple stages ensures consistent performance with reduced losses throughout the multistage system.
3Adaptability or versatility
If asymmetric transmission line lengths are used, then the layout flexibility is improved, but the electrical length difference must be compensated
Solution Approach 1:
The patent introduces open stubs as intermediary elements connected to the transmission lines. These open stubs act as mediators that compensate for the electrical length difference between the asymmetric first and second transmission lines, allowing the device to maintain proper electrical characteristics while benefiting from the layout flexibility of asymmetric configurations.
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 results in a smaller size and reduced loss, enabling a more compact and efficient power splitter-combiner with improved flexibility in layout and performance.
Implementation Method 1
at least one first open stub is connected to the second transmission line... the length of the second transmission line is compensated by the first open stub connected to the second transmission line
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
The power splitter-combiner (1) includes one combining terminal (11), two split terminals (12a, 12b), an absorption resistance (13) connected between the two split terminals, a first transmission line (14a) connected between the combining terminal and one split terminal of the two split terminals, a second transmission line (14b) connected between the combining terminal and the other split terminal of the two split terminals and having a length shorter than that of the first transmission line, and at least one first open stub (15) connected to the second transmission line.