Microstrip Power Divider with Quarter-Wavelength Stages
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Solution Overview
Problem
Conventional one input to four output power dividers with microstrip structures suffer from poor reflection coefficients and insufficient working bandwidth, particularly in the frequency range of 50 MHz to 806 MHz, leading to higher component costs, longer soldering times, and variability in characteristics due to manual soldering.
Innovation Solution
A one input to four output power divider design incorporating a first and second quarter-wavelength microstrip power dividers, with each microstrip power divider based on the Wilkinson design, and additional resistors to achieve impedance matching and improve reflection coefficients, allowing operation within the specified frequency band from 50 MHz to 806 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional microstrip power divider is used, then the structure is simpler and manufacturing is easier, but the reflection coefficients are poor and working bandwidth is insufficient
Solution Approach 1:
The power divider is divided into multiple stages (first microstrip power divider, second microstrip power divider, third microstrip power divider) with quarter-wavelength microstrips connecting them. This segmentation allows each stage to contribute to impedance matching and bandwidth extension, resolving the contradiction between manufacturing simplicity and reflection coefficient performance.
Solution Approach 2:
Quarter-wavelength microstrips are introduced as intermediary elements between the microstrip power dividers. These intermediary elements provide impedance transformation and matching, improving reflection coefficients without requiring complex manual soldering of wired transformers.
2Reliability
If wired transformers are used, then impedance matching may be achieved, but component cost is higher and manual soldering is required
Solution Approach 1:
The mechanical wired transformer structure is replaced with a microstrip transmission line structure. This substitution eliminates the need for manual soldering and complex assembly while achieving impedance matching through controlled impedance microstrip design and quarter-wavelength transformation.
Solution Approach 2:
The impedance matching is achieved by changing the characteristic impedance parameters of the microstrip lines and using quarter-wavelength transformation. This allows impedance matching to be achieved through PCB fabrication parameters rather than discrete component selection and assembly.
3Reliability
If manual soldering of wired transformers is performed, then impedance matching can be achieved, but working hours and labor cost increase
Solution Approach 1:
The manual soldering process is completely eliminated by replacing wired transformers with microstrip structures that are fabricated directly on the PCB. This substitution transforms a labor-intensive manual process into an automated PCB manufacturing process, dramatically increasing productivity.
4Ease of manufacture
If conventional microstrip power dividers are used, then manufacturing is simpler, but the working bandwidth is insufficient for 50 MHz to 806 MHz range
Solution Approach 1:
The single-stage power divider is segmented into multiple cascaded stages with quarter-wavelength microstrips. This segmentation extends the operating bandwidth by creating multiple impedance transformation points that work together to maintain performance across the 50 MHz to 806 MHz frequency range.
Solution Approach 2:
The multi-stage microstrip structure serves multiple functions simultaneously: power division, impedance matching, and bandwidth extension. This multi-functionality allows the structure to operate effectively across a wide frequency range while maintaining manufacturing simplicity.
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 enhances the working bandwidth by reducing reflection coefficients and improving impedance matching, resulting in a more stable and cost-effective power divider suitable for the specified frequency range, replacing conventional wired transformers with a microstrip structure.
Implementation Method 1
The first quarter-wavelength microstrip has a length corresponding to a quarter of a wavelength of a signal at a specified frequency within the specified frequency band, has an end coupled electrically to one of the output terminals of the first microstrip power divider, and has a characteristic impedance substantially equal to an output impedance of the first microstrip power divider
Data Source
AI summary
A one input to four output power divider is operable in a specified frequency band, and includes a first microstrip power divider, a first quarter-wavelength microstrip which has an end coupled electrically to one output terminal of the first microstrip power divider, a second microstrip power divider which has an input terminal coupled electrically to another end of the first quarter-wavelength microstrip, a second quarter-wavelength microstrip which has an end coupled electrically to the other output terminal of the first microstrip power divider, and a third microstrip power divider which has an input terminal coupled electrically to another end of the second quarter-wavelength microstrip.