Harmonic Oscillator Responding Units for Cavity Filter Miniaturization
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Solution Overview
Problem
Existing microwave radio frequency devices, such as cavity filters and duplexers, face challenges in miniaturization without compromising resonance frequency and performance, as reducing the volume of resonant cavities increases resonance frequency, making it difficult to meet filtering requirements.
Innovation Solution
A harmonic oscillator with a dielectric body and responding units made from materials with high permittivity and low loss angle tangent values, where the responding units are attached to cylindrical surfaces within the resonant cavity, effectively reducing resonance frequency and volume while minimizing eddy current loss and maintaining Q value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the volume of the resonant cavity is reduced to achieve miniaturization, then the device size is decreased, but the resonance frequency increases which fails to meet filtering function requirements
Solution Approach 1:
The patent introduces responding units with specific dimensional parameters (less than 1/2 wavelength, preferably less than 1/5 or 1/10 wavelength) that interact with the electromagnetic field to modify the effective permittivity and resonance characteristics, enabling volume reduction without frequency shift
Solution Approach 2:
The patent combines dielectric material with conductive material featuring artificial micro-structures to create a composite responding unit that simultaneously achieves miniaturization and maintains resonance frequency through synergistic electromagnetic properties
2Volume of moving object
If the volume of the resonant cavity is reduced, then the device size is decreased, but the filtering function requirement cannot be met
Solution Approach 1:
The patent applies responding units at specific locations on the dielectric body surface where they locally modify electromagnetic field distribution, enabling miniaturization while preserving the overall filtering function through localized electromagnetic property enhancement
3Speed
If a responding unit with conductive material is introduced to increase permittivity, then the resonance frequency decreases and miniaturization is achieved, but eddy current loss increases and Q value decreases
Solution Approach 1:
The patent employs artificial micro-structures with geometric patterns that create controlled electromagnetic pathways, allowing the conductive material to increase permittivity while the micro-structure design minimizes eddy current formation and associated losses
Solution Approach 2:
The patent converts the potentially harmful eddy current effect into a beneficial phenomenon by designing artificial micro-structures that guide electromagnetic field distribution, transforming energy that would be lost to eddy currents into useful field confinement and resonance enhancement
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 allows for miniaturization of microwave devices by decreasing resonance frequency and reducing the volume of filters while maintaining performance, with the responding units enhancing permittivity and minimizing Q value loss.
Implementation Method 1
The responding unit is used to increase a permittivity, which can effectively decrease a resonance frequency of the filter
Implementation Method 2
because the responding unit is attached onto a cylindrical surface, an eddy current loss is effectively reduced and even avoided, thereby avoiding decrease of a Q value
Implementation Method 3
A harmonic oscillator, also called a dielectric resonator, has advantages such as a high permittivity and a low electromagnetic loss
Data Source
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AI summary
The present application relates to a harmonic oscillator. The harmonic oscillator includes a dielectric body and at least one responding unit attached onto a surface of the dielectric body, where the responding unit is a conductive structure having a geometrical pattern. The application further relates to a cavity filter having the harmonic oscillator and an electromagnetic wave device. By using the harmonic oscillator in the application, a permittivity can be effectively increased and a resonance frequency of a cavity filter can be decreased, thereby implementing miniaturization. Moreover, for an electromagnetic wave in a TM mode, a frequency can be decreased and an electromagnetic loss is not affected.