Nonlinear Transmission Line for High-Voltage RF Pulse Sharpening
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Solution Overview
Problem
Producing high power microwave pulses is challenging due to the high voltages and high frequencies involved, requiring innovative solutions to manage and manipulate electrical pulses effectively.
Innovation Solution
A high voltage nonlinear transmission line comprising nonlinear semiconductor junction capacitance devices and inductors, which sharpen the rise time of input pulses, producing a high voltage output signal that oscillates at frequencies greater than 100 MHz about voltages greater than 10 kV, utilizing a series and parallel arrangement of capacitors and inductors to enhance pulse propagation and frequency generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional linear transmission lines are used, then the system is simple and easy to manufacture, but the rise time of input pulses cannot be sharpened and high frequency RF signals cannot be generated
Solution Approach 1:
The patent transforms the linear transmission line into a nonlinear transmission line by using nonlinear semiconductor junction capacitance devices. The capacitance of these devices changes with voltage, creating a voltage-dependent transmission line that can sharpen pulse rise times. This parameter change from linear to nonlinear characteristics enables the rise time sharpening function while managing the increased complexity through careful device selection and circuit design.
2Power
If high voltage pulses are used to generate microwave signals, then the output power is sufficient, but the system becomes difficult to control and manage
Solution Approach 1:
The patent employs a dynamic nonlinear transmission line where the capacitance of semiconductor junction devices changes in real-time with the applied voltage. This dynamic characteristic allows the transmission line to automatically adapt to different input conditions, sharpening rise times and generating RF frequencies without requiring complex external control systems. The nonlinear devices inherently manage the high voltage pulses through their voltage-dependent behavior.
3Manufacturing precision
If nonlinear semiconductor junction capacitance devices are used, then the rise time is sharpened and high frequency signals are generated, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the transmission line into discrete circuit elements, each containing nonlinear semiconductor junction capacitance devices and inductors. This segmentation allows for modular construction where each unit can be designed and tested independently before assembly. The repetitive structure of multiple identical or similar elements simplifies manufacturing by enabling standardized production and assembly procedures, reducing the overall complexity despite the nonlinear functionality.
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 nonlinear transmission line effectively sharpens the rising edge of input pulses, leading to a high frequency RF signal output, capable of producing microwave signals with frequencies ranging from 100 MHz to 30 GHz, addressing the challenges of high voltage and frequency manipulation in microwave pulse generation.
Implementation Method 1
each of the plurality of circuit elements includes a nonlinear semiconductor junction capacitance device
Data Source
AI summary
Some embodiments include a high voltage nonlinear transmission line comprising a high voltage input configured to receive electrical pulses having a first peak voltage that is greater than 10 kV; a plurality of circuit elements electrically coupled with ground, each of the plurality of circuit elements includes a nonlinear semiconductor junction capacitance device; a plurality of inductors, at least one of the plurality of inductors is electrically coupled between two circuit elements of the plurality of circuit elements; and a high voltage output providing a high voltage output signal that oscillates at a frequency greater than 100 MHz about a voltage greater than 10 kV.