Microwave Generator Pulse Precharging to Prevent Transmission Overshoot
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Solution Overview
Problem
Existing systems for transmitting electrical pulses from a pulse generator to a beam head in microwave systems experience undesirable fluctuations due to abrupt changes in delay tube electrical characteristics, necessitating impedance-matched transmission and components like matching transformers, which limit design flexibility and increase space and weight.
Innovation Solution
A method involving precharging the transmission line with a voltage below the ignition voltage of the microwave generator, followed by increasing it to or above the ignition voltage, allows for non-impedance-matched transmission, eliminating the need for transformers and reducing fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If impedance-matched transmission is used with matching transformers, then voltage and current fluctuations are reduced, but device complexity, installation space, and weight increase
Solution Approach 1:
The patent removes the matching transformer component from the system entirely. By using a transmission line with characteristic impedance matched to the pulse generator output impedance (Z0 = Rs), the system achieves stable voltage and current transmission without requiring the additional transformer component, thus reducing device complexity while maintaining reliability
Solution Approach 2:
The transmission line itself serves as the intermediary element that provides impedance matching. By selecting a transmission line with characteristic impedance equal to the pulse generator's output impedance, the system achieves proper matching without external matching components, eliminating the need for transformers and reducing overall system complexity
2Reliability
If matching transformers are used for impedance matching, then transmission stability improves, but installation space and weight increase
Solution Approach 1:
The matching transformer is completely removed from the system. The patent demonstrates that proper impedance matching can be achieved through transmission line characteristic impedance selection alone, eliminating the heavy transformer component and significantly reducing system weight while maintaining transmission stability
3Device complexity
If non-impedance-matched transmission is used without transformers, then device complexity and installation space are reduced, but voltage and current fluctuations increase
Solution Approach 1:
The patent changes the key parameter of transmission line characteristic impedance to match the pulse generator's output impedance (Z0 = Rs). This parameter selection ensures proper impedance matching, preventing voltage and current fluctuations while maintaining a simple system without transformers, thus achieving both reduced complexity and maintained reliability
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 enables flexible system design with reduced installation space and weight, allowing pulse transmission over meters without transformers, effectively preventing voltage and current overshoots.
Implementation Method 1
after blocking the voltage output: outputting a voltage from the pulse generator to the transmission line, wherein the voltage is below an ignition voltage of the microwave generator, to precharge the transmission line
Implementation Method 2
outputting a voltage to the transmission line which is at or above the ignition voltage of the microwave generator, in particular increasing the voltage to the voltage at or above the ignition voltage, so that the microwave generator generates electromagnetic waves in the microwave range
Data Source
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Figure 3
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AI summary
The invention relates to a method for operating a system for generating electromagnetic waves in the microwave range, wherein the system comprises a pulse generator for generating electrical pulses, a microwave generator (14) for generating microwaves, and a transmission line (13) between the pulse generator (10) and the microwave generator (14), wherein the method comprises: blocking a voltage output from the pulse generator (10) to the transmission line (13); after blocking the voltage output: outputting a voltage from the pulse generator (10) to the transmission line (13), wherein the voltage is below an ignition voltage of the microwave generator (14), for precharging the transmission line (13);After precharging the transmission line (13): Applying a voltage to the transmission line (13) that is above the ignition voltage of the microwave generator (14), so that the microwave generator (14) generates electromagnetic waves in the microwave range.