Folded Waveguide Slow-Wave Structure for Wideband TWT Stability
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Solution Overview
Problem
Conventional slow-wave structures in traveling wave tubes face challenges in achieving wide bandwidth, high electronic efficiency, and stability while maintaining structural simplicity, due to complexity introduced by multi-segment phase velocity jumping and radial designs that increase oscillation risk and reduce operating bandwidth.
Innovation Solution
A slow-wave structure with a folded waveguide design featuring a continuously changing amplitude and cycle in the longitudinal direction, combined with a folding line and dielectric support, allows for a full-cycle gradient phase velocity that synchronizes with the electron beam, reducing reflection and backward wave oscillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a multi-segment discrete phase velocity jumping slow-wave structure is used to synchronize phase velocity with electron beam velocity, then electronic efficiency is improved, but structural complexity increases
Solution Approach 1:
The patent applies parameter changes by continuously varying the amplitude and/or cycle of the folded waveguide structure along the longitudinal direction, creating a gradient phase velocity distribution. This replaces the discrete multi-segment approach with a continuous parameter variation, achieving phase velocity synchronization while reducing structural complexity and eliminating abrupt transitions.
Solution Approach 2:
The patent implements dynamics by introducing a variable amplitude and/or cycle folded waveguide structure where the geometric parameters change continuously along the longitudinal direction. This dynamic structure allows the phase velocity to adapt continuously to match the electron beam velocity profile, improving electronic efficiency without requiring multiple discrete segments.
2Power
If a multi-segment discrete phase velocity jumping slow-wave structure is used to improve electronic efficiency, then gain is improved, but overall performance stability deteriorates
Solution Approach 1:
The patent uses continuous parameter changes in the folded waveguide amplitude and/or cycle to create a smooth gradient phase velocity distribution. This eliminates the abrupt phase velocity jumps in multi-segment structures, reducing reflections and improving performance stability while maintaining high gain through continuous phase velocity matching with the electron beam.
3Ease of manufacture
If a conventional slow-wave structure is used with fixed amplitude and cycle, then manufacturing is simplified, but operating bandwidth is reduced
Solution Approach 1:
The patent employs parameter changes by varying the amplitude and/or cycle of the folded waveguide structure along the longitudinal direction. This creates a gradient phase velocity distribution that can accommodate a wider range of frequencies, thereby expanding the operating bandwidth while maintaining manufacturing feasibility through a systematic design approach.
4Reliability
If the amplitude and cycle of the folded waveguide structure change gradually in the longitudinal direction, then reflection is reduced and backward wave oscillation is suppressed, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements parameter changes with controlled gradient in the folded waveguide amplitude and/or cycle along the longitudinal direction. This gradual variation reduces reflections and suppresses backward wave oscillation while maintaining manufacturability by using practical gradient rates that can be achieved with current manufacturing capabilities.
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 enables a traveling wave tube with improved interaction efficiency, wider operating bandwidth, and enhanced stability by ensuring continuous phase velocity matching with the electron beam, thus improving overall performance without increasing structural complexity.
Implementation Method 1
a slow-wave structure (SWS) can convert direct-current energy of an electron beam into energy of an electromagnetic wave through interaction between the electron beam and the electromagnetic wave transmitted along the slow-wave structure
Implementation Method 2
convert direct-current energy of an electron beam into energy of an electromagnetic wave through interaction between the electron beam and the electromagnetic wave
Implementation Method 3
A phase velocity of the electromagnetic wave transmitted along the slow-wave structure is synchronized with a velocity of the electron beam
Implementation Method 4
the electromagnetic wave transmitted along the slow-wave structure
Data Source
AI summary
A slow-wave structure, a traveling wave tube, an electronic device, and a communication system are provided. The slow-wave structure includes a folded waveguide structure, where the waveguide structure has a cycle in a longitudinal direction and an amplitude in a transverse direction perpendicular to the longitudinal direction, and at least one of an amplitude of a first part of the waveguide structure and a cycle of the first part gradually changes in the longitudinal direction. Therefore, reflection of the slow-wave structure can be reduced, backward wave oscillation can be effectively suppressed, and a wider operating bandwidth can be obtained.