Power Divider Circuit with Matching Element for Harmonic Reduction
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Solution Overview
Problem
Existing power dividers in microwave systems face challenges in size and power dividing efficiency, particularly in reducing high-frequency harmonics effectively.
Innovation Solution
A power dividing circuit design featuring symmetrically installed transmission subcircuits with resonators and microstrip lines, coupled with a matching element to reduce high-frequency harmonics and improve impedance matching, allowing for efficient signal division at specific frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional power dividers are used in microwave systems, then the basic power division function is achieved, but the size becomes large and high-frequency harmonics cannot be effectively reduced
Solution Approach 1:
The power divider is divided into multiple functional segments: input port, multiple transmission lines with different characteristic impedances, output ports, and integrated filtering elements. Each segment performs a specific function (signal division, impedance transformation, filtering) allowing the overall device to be compact while effectively handling high-frequency harmonics through the distributed segmentation of functions.
Solution Approach 2:
The transmission lines serve multiple functions simultaneously: they perform power division, provide impedance transformation, and act as filtering elements for high-frequency harmonics. By integrating these functions into a single compact structure rather than using separate components, the power divider achieves effective harmonic reduction without increasing size.
2Area of stationary object
If the power divider size is reduced, then compactness is improved, but the power dividing effect and filtering performance deteriorate
Solution Approach 1:
The patent employs specific parameter optimization including characteristic impedance values (e.g., 50Ω, 70.7Ω, 100Ω), transmission line length ratios, and frequency band specifications (5GHz-8.4GHz) to achieve effective power division and filtering in a compact form. These parameter changes allow the small-sized device to maintain excellent power dividing effect and harmonic rejection performance.
3Ease of manufacture
If conventional designs are used, then manufacturing is straightforward, but impedance matching and harmonic reduction performance are insufficient
Solution Approach 1:
The patent introduces intermediate transmission lines with specific characteristic impedances (such as 70.7Ω or 100Ω) between the input and output ports to serve as impedance matching intermediaries. These intermediate elements facilitate smooth impedance transformation and effective harmonic filtering while maintaining a relatively simple manufacturing process based on standard PCB fabrication techniques.
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 achieves effective reduction of high-frequency harmonics, with a return loss of less than −20 dB across 5 GHz-8.4 GHz, enhancing the power dividing function and filtering performance.
Implementation Method 1
The first transmission subcircuit 30 and the second transmission subcircuit 40 generate the same resonance frequency to reduce high frequency harmonics
Data Source
AI summary
A power dividing circuit includes an input port, a first microstrip line, a first transmission subcircuit, a second transmission subcircuit, and a matching element. The first transmission subcircuit is coupled to a first microstrip line first end, and the first transmission subcircuit includes a first output port and a first resonance unit. The second transmission subcircuit is coupled to a first microstrip line second end, and the second transmission subcircuit includes a second output port and a second resonance unit. The matching element is coupled between the first output port and the second output port, the matching element matches impedances between the first transmission subcircuit and the second transmission subcircuit. A power divider is also provided.