Filament Injection Locking for Compact Magnetron Microwave Output
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Solution Overview
Problem
Existing injection-locked magnetron systems require large-volume waveguide isolators, leading to significant space occupation, high manufacturing costs, and increased loss due to the use of waveguide circulators or magic-Tee components.
Innovation Solution
A novel injection-locked magnetron system utilizing a filament injection method, where a monopole antenna extends into the magnetron filament cavity to couple an external signal directly into the magnetron resonant cavity, eliminating the need for large waveguide isolators and reducing system volume and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a waveguide circulator or magic-Tee is used to isolate the external signal source from the magnetron output, then the injection locking function is achieved, but the system volume and weight increase significantly
Solution Approach 1:
The patent extracts and removes the waveguide circulator or magic-Tee component from the system. Instead of using these large-volume isolators, the invention directly couples the external signal source to the magnetron resonant cavity through an antenna, eliminating the need for bulky waveguide isolators while maintaining injection locking functionality.
Solution Approach 2:
The patent introduces an antenna as an intermediary component to couple the external signal source with the magnetron resonant cavity. This antenna-based coupling mechanism replaces the waveguide circulator/magic-Tee and achieves signal isolation and injection locking without requiring large-volume waveguide components.
2Reliability
If a waveguide circulator or magic-Tee is used to isolate the external signal source from the magnetron output, then the injection locking function is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent removes the expensive waveguide circulator or magic-Tee components from the system architecture. By eliminating these high-cost isolators and using a simpler antenna-based coupling approach, the manufacturing cost is significantly reduced while the injection locking function is preserved.
3Reliability
If a waveguide circulator or magic-Tee is used to isolate the external signal source from the magnetron output, then the injection locking function is achieved, but the system loss increases
Solution Approach 1:
The patent extracts and eliminates the waveguide circulator or magic-Tee components that introduce significant insertion loss. The direct antenna-based coupling approach reduces the number of interfaces and components through which signal loss can occur, thereby reducing overall system loss while maintaining injection locking performance.
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 approach allows for effective frequency locking of the magnetron's output microwave with reduced system size and cost, as demonstrated by the achieved locking bandwidth and reduced number of high-power components.
Implementation Method 1
the injection antenna is used to receive an injected external signal and couple the injected external signal into the magnetron to realize injection locking of the magnetron
Data Source
AI summary
An injection locked magnetron system based on filament injection is provided, which includes a magnetron, an excitation cavity, and a load. The magnetron is installed on the excitation cavity and connected to the excitation cavity, the excitation cavity is detachably connected to the load, the magnetron is provided with an injection antenna, and the injection antenna is used to receive an injected external signal and couple the injected external signal into the magnetron for realizing injection locking. The injected external signal is injected by a monopole antenna, and coupled into the magnetron resonant cavity through a magnetron filament, and the output microwave of the magnetron is output through the excitation cavity, and passes through the waveguide directional coupler, and is finally absorbed by the load, such that the output microwave of the magnetron can be locked by the injected external signal.