High Frequency Oscillator Reactance Control via Electromagnetic Coupling

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Solution Overview

Problem

Existing methods for varying the oscillation frequency of high frequency oscillators, such as magnetrons, have limited frequency range and stability due to the characteristics of switching elements and attachment conditions, leading to significant fluctuations in oscillation output when bias voltage is applied.

Innovation Solution

A method involving a switching element electromagnetically coupled to a cavity resonator, with a metal plate for reflecting high-frequency waves and a bias voltage applied to change the reactance of the switching element and resonance frequency, allowing for a wide range of impedance characteristics and stable oscillation output without mechanical means, using a simple configuration and external electric signal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a switching element is used to vary oscillation frequency by applying bias voltage, then the oscillation frequency can be adjusted, but the frequency range is limited and the oscillation output fluctuates significantly due to switching element characteristics and attachment conditions

Engineering Contradiction:

Improvefrequency adjustment capabilityVSAvoidoscillation output stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

A metal plate is introduced as an intermediary component between the switching element and the cavity resonator. This metal plate reflects high-frequency waves and enables electromagnetic coupling, allowing the switching element to control the resonance frequency without direct contact or mechanical attachment to the cavity, thereby eliminating attachment accuracy issues while maintaining frequency adjustment capability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention replaces mechanical attachment methods with electromagnetic coupling. Instead of mechanically connecting the switching element to the cavity resonator (which requires precise attachment), the switching element is electromagnetically coupled to the cavity through the metal plate, substituting mechanical precision requirements with electromagnetic field interaction that is more tolerant of variations

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If conventional methods are used to vary oscillation frequency, then the structure remains simple, but the frequency range is limited and attachment accuracy requirements increase

Engineering Contradiction:

Improveoscillator structure simplicityVSAvoidattachment accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The metal plate serves as an intermediary that enables the switching element to be positioned outside the cavity resonator while still controlling its frequency. This eliminates the need for precise internal attachment of the switching element to the cavity, reducing manufacturing precision requirements while maintaining structural simplicity

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

By replacing mechanical attachment with electromagnetic coupling through the metal plate, the system eliminates strict mechanical precision requirements. The electromagnetic field interaction does not depend on precise physical contact, thereby reducing manufacturing complexity and attachment accuracy requirements

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 the production of high-powered microwaves with a desired frequency, quick response, and reduced influence from switching element characteristics and attachment accuracy, enhancing radar detection performance and frequency adjustment capabilities while maintaining low costs and productivity.

Implementation Method 1

providing a metal plate having a size enough for reflecting a high frequency wave to be transmitted through the switching element

Methodology Applied

Scientific EffectElectromagnetic wave reflection: Reflection

Implementation Method 2

varying a bias voltage by applying the bias voltage to the switching element, and thereby changing a reactance of the switching element and a resonance frequency of the cavity resonator

Methodology Applied

Scientific EffectReactance modulation: Capacitance

Implementation Method 3

a cavity resonator of the high frequency oscillator... a resonance frequency of the cavity resonator

Methodology Applied

Scientific EffectCavity resonance: Resonance

Data Source

PatentUS9035707B2Method for varying oscillation frequency of high frequency oscillator

Publication Date: 2015.05.19 NEW JAPAN RADIO CORP

AI summary

The switching element is provided in a state of being electromagnetically coupled to the cavity resonator of the high frequency oscillator; the bias voltage applying terminal is connected to one electrode of the switching element; another electrode of the switching element is electrically connected to the cavity resonator (the anode shell in FIG. 1); the metal plate having a size enough for reflecting an electric wave to be transmitted before and after the switching element in a high-frequency manner is provided at any one end of the switching element; and by applying a bias voltage to the switching element and varying that, a reactance of the switching element is changed and a resonance frequency of the cavity resonator is varied. By this method, an oscillation frequency can be varied greatly relative to a small change in a bias voltage.