Waveguide Power Combining Unit Radial Structure
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Solution Overview
Problem
Current power combining/dividing units face limitations in achieving high electric power transmission due to the use of coaxial lines, which have high transmission loss and low power resistance, especially at high frequency bands, necessitating multistage connections that increase costs and complexity.
Innovation Solution
A waveguide type power combining/dividing unit is designed with rectangular waveguides in a radial pattern and a central circular waveguide, where the rectangular waveguides function as input ends and the circular waveguide as the output end, allowing for high power combination and division without multistage connections, and incorporating features like ridges and radio wave absorbers to manage frequency and mode conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If coaxial lines are used for high electric power transmission, then the structure is simple, but transmission loss increases and power resistance decreases
Solution Approach 1:
The patent changes the transmission medium from coaxial lines to waveguides, fundamentally altering the physical parameters of power transmission. Waveguides support higher power levels and lower loss at microwave frequencies compared to coaxial lines, directly resolving the contradiction between structural simplicity and transmission efficiency
Solution Approach 2:
The patent replaces the coaxial line mechanical structure with a waveguide structure that has different electromagnetic field distribution characteristics. This substitution enables higher power handling capability and lower transmission loss while maintaining the combining/dividing function
2Power
If coaxial lines with large diameter are used, then power resistance increases, but cutoff frequency decreases limiting high frequency application
Solution Approach 1:
The patent changes the transmission medium from coaxial lines to waveguides, which have different frequency-power characteristics. Waveguides maintain high cutoff frequencies even when designed for high power transmission, unlike coaxial lines where increasing diameter lowers cutoff frequency
Solution Approach 2:
The patent uses different waveguide types (rectangular and circular) with optimized dimensions for specific frequency and power requirements. Each waveguide section is locally optimized to provide both high power resistance and appropriate cutoff frequency for its specific function
3Power
If multistage connection of power combining units is used, then high output electric power is achieved, but device complexity and cost increase
Solution Approach 1:
The patent merges multiple input waveguides into a single circular waveguide using a radial configuration where all rectangular waveguides connect to the periphery of one central circular waveguide. This single-stage merging achieves high power combination without requiring multiple sequential stages
Solution Approach 2:
The patent designs a universal power combining/dividing unit that can function in both combining and dividing modes by simply reversing the signal flow direction. This multi-functionality eliminates the need for separate multistage combining and dividing structures
4Loss of energy
If waveguides are used for high electric power transmission, then transmission loss decreases, but mode interference may occur
Solution Approach 1:
The patent uses mode converters that transform potentially harmful mode conversions into controlled transitions. The rectangular-to-circular waveguide transition naturally converts TE10 modes to TM01 modes, and this conversion is managed through carefully designed transition sections that minimize interference
Solution Approach 2:
The patent introduces mode converters as intermediary elements between rectangular and circular waveguides. These converters serve as mediators that facilitate smooth mode transitions while isolating the main transmission paths from direct mode interference
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 configuration reduces facility and installation costs, enables efficient high-power transmission across a wide frequency band, and simplifies the mechanical design by allowing more waveguides to be connected, while maintaining low transmission loss and preventing unwanted mode interference.
Implementation Method 1
a plurality of rectangular waveguides (TE10 mode) disposed in a radial pattern and a circular waveguide (TM01 mode) disposed at a center of the radial pattern
Implementation Method 2
one ends of the plurality of rectangular waveguides are connected to a side surface of one end of the circular waveguide
Data Source
AI summary
A waveguide type power combining/dividing unit W includes a plurality of rectangular waveguides 1 for TE10 mode disposed in a radial pattern, a circular waveguide 2 for TM01 mode disposed at a center of the radial pattern, in which one ends of the plurality of the rectangular waveguides 1 are connected to a side surface of one end of the circular waveguide.