Eggbeater Cathode for Magnetrons Anchored Between Support Discs
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Solution Overview
Problem
Conventional transparent cathodes in magnetrons and ubitrons suffer from mechanical weakness and deformation due to unsupported cathode strips, which can lead to decreased performance and reliability, especially in high-power applications.
Innovation Solution
The introduction of an 'eggbeater' cathode design, where cathode strips are anchored at both ends between support discs, forming an open-walled cylindrical structure, providing enhanced mechanical integrity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional transparent cathodes with unsupported cathode strips are used, then the device structure is simpler, but the mechanical strength and reliability deteriorate
Solution Approach 1:
The cathode is segmented into multiple discrete cathode strips arranged in an eggbeater pattern, with each strip independently supported at both ends by support discs. This segmentation allows each strip to be mechanically supported while maintaining the transparent cathode configuration, resolving the contradiction between mechanical strength and structural simplicity.
Solution Approach 2:
The cathode strips are arranged in a three-dimensional eggbeater pattern with support discs positioned at both ends, adding dimensional support structure. This dimensional change provides mechanical strength without significantly increasing overall device complexity, as the support structure integrates with the existing cathode geometry.
2Productivity
If longer and thinner cathode strips are used, then the microwave generation performance is improved, but the mechanical stability deteriorates
Solution Approach 1:
The cathode strips are pre-supported at both ends by support discs before operation begins. This preliminary support structure prevents mechanical instability during operation, enabling the use of longer and thinner strips that would otherwise be too fragile, thus improving microwave generation performance while maintaining stability.
3Reliability
If the cathode strips are made thinner, then the transparency and microwave field penetration is improved, but the resistance to heat and magnetic forces deteriorates
Solution Approach 1:
The cathode is divided into multiple thin, segmented strips rather than a solid structure. This segmentation allows each strip to be thin enough for good microwave penetration while the collective array, supported by discs, provides sufficient mechanical strength and heat resistance, resolving the contradiction between transparency and durability.
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 eggbeater cathode design significantly improves the mechanical strength and reliability of magnetrons and ubitrons, allowing for longer, thinner cathode strips and increased resistance to heat and magnetic forces, leading to enhanced high-power microwave generation and extended operational performance.
Implementation Method 1
Magnetrons are either of the hot (thermionic) cathode type, which typically operate at voltages ranging from a few hundred volts to a few tens of kilovolts, or of the cold cathode type, with secondary electron emission or explosive emission
Implementation Method 2
When the azimuthal phase velocity of one of eigenmodes of the resonant system is close to the azimuthal drift velocity of the electrons, energy of electrons is transferred to this electromagnetic wave. As the wave gains energy, fields of the wave back-react on the electron charge cloud to produce spatial bunching of the electrons, which in turn reinforces the growth of the wave.
Implementation Method 3
A typical conventional magnetron structure is a coaxial vacuum diode with a cathode having a solid cylindrical surface and an anode consisting of an even number of cavities forming an azimuthally periodical resonant system. TE-type eigenmodes of the resonant system are used as operating waves
Data Source
AI summary
An “eggbeater” cathode comprising a transparent cathode including a plurality of longitudinally oriented cathode strips anchored at both ends between support discs and forming an open-walled hollow cylindrical structure. A cathode base is disposed substantially coaxially with a longitudinal axis of the transparent cathode and surrounded by the plurality of cathode strips, wherein the support discs secure the cathode strips to the cathode base and result in a cathode that is more robust in harsh operating environments compared with a simple transparent cathode.