Microwave Rotary Joint Mode Converter with Integrated Waveguides
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Solution Overview
Problem
High frequency microwave rotary joints face challenges in efficiently converting microwave signals from rectangular to circular TE01 mode without being affected by swirl structures, which can disrupt signal transmission.
Innovation Solution
A mode converter comprising two circular waveguides with power dividing structures and a bearing integration, allowing for conversion of microwave signals from rectangular to circular TE01 mode, ensuring minimal impact from swirl structures and maintaining signal purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two mode converters are disposed at different positions to convert microwave signals between rectangular and circular modes, then the coupling effect is improved, but the device complexity increases
Solution Approach 1:
The patent combines two separate mode converters into a single integrated mode converter by rotating one circular waveguide relative to the other. This integration maintains the dual-mode conversion functionality while reducing the overall number of components and simplifying the device structure.
Solution Approach 2:
The patent introduces a rotatable circular waveguide that can be rotated to different angular positions. This dynamic adjustment allows the device to achieve proper mode conversion alignment without requiring two fixed mode converters, thereby reducing complexity while maintaining coupling effectiveness.
2Productivity
If circular TE11 mode is used in the middle channel, then the mode can be transmitted, but the signal is affected by the seam of the swirl structure
Solution Approach 1:
The patent changes the operational mode parameter from circular TE11 to circular TE01. The TE01 mode has a different current distribution pattern that does not intersect with the seam location, thereby eliminating the harmful interference effect while maintaining signal transmission capability.
Solution Approach 2:
The patent strategically positions the seam and selects the TE01 mode such that the seam location becomes a region of minimal current density for this mode. This converts the potential harmful effect of the seam into a beneficial arrangement where the seam does not disrupt the current flow pattern.
3Object-affected harmful factors
If circular TE01 mode is used in the middle channel, then the signal is not affected by the seam, but the conversion from rectangular mode becomes more difficult
Solution Approach 1:
The patent employs a rotatable circular waveguide structure that can be adjusted to optimal angular positions for mode conversion. This dynamic adjustment capability simplifies the conversion process from rectangular to circular TE01 mode by allowing alignment with the rectangular waveguide's field distribution pattern.
Solution Approach 2:
The patent pre-configures the circular waveguide with four connecting ports positioned at specific angular intervals (0°, 90°, 180°, 270°). This preliminary arrangement of ports and internal structure is designed to facilitate efficient mode conversion from rectangular to circular TE01 mode, reducing the difficulty of the conversion process.
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 solution effectively converts microwave signals from rectangular to circular TE01 mode, eliminating the influence of swirl structures and ensuring efficient signal transmission with high purity, thus enhancing the performance of microwave rotary joints.
Implementation Method 1
a mode converter for converting microwave signals of a TE01 circular symmetric mode... two power dividing structures, each of the power dividing structure has an input/output port and four connecting ports... connected to the inside of each of the circular waveguides
Data Source
AI summary
A microwave rotary joint comprises a mode converter for converting microwave signals of a TE01 circular symmetric mode, and the mode converter comprises: two circular waveguides, one end of each of the waveguides has a circular input/output port; and two power dividing structures, each of the power dividing structure has an input/output port and four connecting ports, the four connecting ports are separated and surround each of the circular waveguides and connected to the inside of each of the circular waveguides, the two circular waveguides are integrated as one member through rotating a bearing.