Annular Resonant Circuit for Stable Low-Voltage Microwave Oscillators
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Solution Overview
Problem
Magnetrons used in microwave applications require high voltage and have limited lifetime or experience output power degradation over extended operation, necessitating the development of more efficient and reliable microwave oscillator systems.
Innovation Solution
The implementation of a solid-state oscillator system utilizing an amplifier with a resonant circuit featuring a pair of arcuate inductive elements forming an annular structure, capacitively coupled and including a rectangular inductive element for gap capacitance, which provides a resonant feedback loop to produce microwave signals at a lower voltage with high output power and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If magnetrons are used to generate microwaves, then high output power is achieved, but high voltage power source (4 kilovolts or more) is required and lifetime is limited
Solution Approach 1:
The patent replaces the magnetron-based microwave generation system with a solid-state amplifier and resonant circuit system. This substitution eliminates the need for high voltage power sources and extends operational lifetime while maintaining or improving output power through the use of solid-state components that are more reliable and have longer service lives.
Solution Approach 2:
The patent changes the operating voltage parameter from high voltage (4 kilovolts or more) to lower voltage operation. The resonant circuit is designed to generate microwaves at reduced voltage levels while maintaining high output power through efficient energy storage and release in the resonant structure, thereby improving reliability and reducing power source requirements.
2Duration of action of moving object
If magnetrons operate for extended periods, then continuous microwave generation is achieved, but output power degradation occurs
Solution Approach 1:
The patent replaces the magnetron with a solid-state amplifier and resonant circuit system that maintains stable output power over extended operation. The solid-state components do not suffer from the same degradation mechanisms as magnetrons, ensuring consistent performance and eliminating output power degradation during continuous operation.
Solution Approach 2:
The resonant circuit is designed to maintain continuous oscillation with stable amplitude over extended periods. The high quality factor of the resonant circuit ensures that energy is efficiently stored and released, maintaining continuous useful action without degradation, thereby ensuring stable output power during prolonged operation.
3Power
If conventional resonant circuits are used, then microwave generation is achieved, but frequency stability is insufficient due to low quality factor
Solution Approach 1:
The patent employs an annular (circular/curved) resonant circuit structure that provides superior frequency stability compared to conventional linear or rectangular resonant circuits. The circular geometry of the annular structure contributes to higher quality factor and better frequency stability, as the curved path allows for more uniform current distribution and reduced edge effects.
Solution Approach 2:
The patent changes the resonant circuit geometry from conventional shapes to an annular structure, which inherently provides higher quality factor. This geometric parameter change results in improved frequency stability while maintaining effective microwave generation, as the annular configuration reduces energy loss and enhances resonant characteristics.
4Power
If high voltage operation is used, then sufficient output power is achieved, but voltage variations and load impedance changes affect stability
Solution Approach 1:
The patent changes the operating voltage parameter from high voltage to lower voltage operation. The solid-state amplifier and resonant circuit system is designed to operate at reduced voltage levels while maintaining high output power through efficient energy transfer and resonant amplification, thereby eliminating sensitivity to voltage variations and load impedance changes.
Solution Approach 2:
The patent employs feedback mechanisms in the solid-state amplifier system to maintain stable output power and frequency despite variations in load impedance. The feedback circuit continuously monitors output conditions and adjusts amplifier parameters to compensate for impedance changes, ensuring stable operation without requiring high voltage operation.
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 solution enables the production of microwave signals with equivalent or higher output power than conventional magnetrons at a lower voltage, while maintaining frequency stability due to the high quality factor of the annular resonant circuit, reducing voltage and load impedance variations.
Implementation Method 1
a first inductive element coupled to the annular resonance structure via a capacitance provided by a gap therebetween
Implementation Method 2
resonant circuitry coupled between the amplifier input and the amplifier output, wherein the resonant circuitry includes a first curved inductive element and a second curved inductive element capacitively coupled to the first curved inductive element
Implementation Method 3
an amplifier having an amplifier input and an amplifier output, and resonant circuitry coupled between the amplifier input and the amplifier output
Data Source
AI summary
Systems and apparatus are provided for solid-state oscillators and related resonant circuitry. An exemplary oscillator system includes an amplifier having an amplifier input and an amplifier output and resonant circuitry coupled between the amplifier output and the amplifier input. In exemplary embodiments, the resonant circuitry includes an annular resonance structure that is substantially symmetrical and includes a pair of arcuate inductive elements. In accordance with one or more embodiments, the resonant circuitry includes an additional inductive element that is capacitively coupled to the annular resonance structure via an air gap to improve the quality factor of the resonant circuitry.