Micro Plasma Limiter Using Resonant Ionization for RF Protection
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Solution Overview
Problem
Conventional protection circuits for electronic circuits against high power signals are expensive, have limited power handling capacity, and high insertion loss, necessitating an improved solution.
Innovation Solution
A limiter circuit using a phase changing material in communication with a resonator, which transitions to a limiting state when the signal energy exceeds a threshold, redirecting or attenuating the high power signals to protect electronic circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surge protection devices (PIN diodes) are used to block high power signals, then electronic circuits are protected from damage, but the protection circuit becomes expensive and has limited power handling capacity
Solution Approach 1:
The patent changes the operating parameters of the protection circuit by using a resonant cavity tuned to a specific frequency rather than relying on the nonlinear characteristics of PIN diodes. This resonant approach allows the circuit to achieve protection at lower cost while handling higher power levels, as the resonance effect provides automatic switching without requiring expensive semiconductor devices rated for high power
Solution Approach 2:
The patent replaces the semiconductor-based protection mechanism (PIN diodes) with an electromagnetic resonance-based mechanism. The resonant cavity uses electromagnetic field effects rather than semiconductor junction effects, eliminating the need for expensive high-power diodes while achieving the same protection function through resonant frequency matching
2Reliability
If conventional surge protection devices are used to block high power signals, then electronic circuits are protected from damage, but insertion loss increases
Solution Approach 1:
The protection circuit dynamically changes its characteristics based on the input signal frequency. At the resonant frequency, the cavity presents a low impedance path that shunts high power signals to ground, providing protection with minimal insertion loss for normal signals. The dynamic response allows the circuit to adapt to different power levels without constant loss
Solution Approach 2:
The resonant cavity acts as an intermediary element between the transmission line and the protected circuit. It provides a controlled impedance transformation and creates a frequency-selective path that protects the circuit from high power signals while maintaining low insertion loss for normal operating signals through its resonant properties
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 solution provides effective protection against high power signals with reduced costs, higher power handling capacity, and minimal insertion loss, ensuring the integrity of sensitive electronics.
Implementation Method 1
A signal propagating on the input signal line at a power level greater than a threshold power level generates a voltage potential across the cavity that ionizes the gas and generates a plasma discharge
Implementation Method 2
A signal propagating on the input signal line at a power level greater than a threshold power level generates a voltage potential across the cavity that ionizes the gas and generates a plasma discharge
Implementation Method 3
The power limiter also includes a resonator selectively coupled to the input signal line and the output signal line
Data Source
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AI summary
A protection circuit configured to protect delicate electronics from high power signals is disclosed herein. To that end, the protection circuit includes a limiter circuit comprising a phase changing material to prevent high power signals from reaching one or more electronic circuits. The phase changing material assumes a limiting state automatically when an energy of an applied signal exceeds a threshold, which limits the energy of the signal passed on to any associated electronics.