Variable Interval Dielectric Resonator Band Pass Filter

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Solution Overview

Problem

Existing band pass filters with TE01δ-mode dielectric resonators have limited adjustable range for center frequency, making them unsuitable for variable frequency applications, as the resonance frequency is largely dependent on the shape and permittivity of the resonator, and varying the interval between components only allows for error adjustments rather than true frequency variation.

Innovation Solution

A band pass filter design featuring two TE01δ-mode dielectric resonators enclosed in a metal housing with a variable opposing interval, allowing for significant adjustment of the resonance frequency by changing the distance between the resonators, which in turn varies the shape and thus the frequency, enabling a wider range of center frequency variation without degrading the Q factor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the interval between the dielectric resonator and the conductive plate is varied to adjust the resonance frequency, then the resonance frequency can be adjusted, but the adjustment range is limited and only suitable for error adjustment rather than true frequency variation

Engineering Contradiction:

Improveresonance frequency adjustment precisionVSAvoidfrequency variation range

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent makes the dielectric resonator itself movable by providing a shifting mechanism that can shift the dielectric resonator in the vertical direction, thereby dynamically changing the opposing interval between the dielectric resonator and the conductive plate. This dynamic adjustment enables large-range frequency variation while maintaining precise control over the resonance frequency.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the physical parameter of the dielectric resonator's position by varying the opposing interval between the dielectric resonator and the conductive plate. This parameter change directly affects the resonance frequency, enabling both precise adjustment and large-range frequency variation.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If additional components with low Q factor are added to achieve variable frequency, then the center frequency can be varied, but the Q factor of the band pass filter degrades

Engineering Contradiction:

Improvecenter frequency variabilityVSAvoidQ factor

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent uses a movable dielectric resonator with a shifting mechanism to dynamically adjust the opposing interval, eliminating the need for additional fixed frequency-adjustment components. This dynamic approach maintains high Q factor while achieving variable center frequency.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The dielectric resonator serves dual functions: it acts as the resonating element and simultaneously provides the frequency adjustment capability through its movable position. This self-service approach eliminates the need for separate frequency-adjustment components that would degrade the Q factor.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If the shape or permittivity of the dielectric resonator is changed to vary the resonance frequency, then the resonance frequency can be adjusted, but the manufacturing complexity increases

Engineering Contradiction:

Improveresonance frequency adjustabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

Instead of changing the shape or permittivity of the dielectric resonator, the patent dynamically adjusts the resonance frequency by changing the position of the dielectric resonator relative to the conductive plate. This approach maintains simple manufacturing while achieving frequency adjustability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the spatial parameter (position) of the dielectric resonator rather than its material or geometric parameters. This parameter change achieves frequency variation without increasing manufacturing complexity.

Inventive Principle:

Principle #35Parameter changes

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 configuration provides a band pass filter capable of varying the center frequency over a large range while maintaining a high Q factor, suitable for microwave and millimeter wave communication systems, and simplifies the design by eliminating the need for additional components with low Q factor.

Implementation Method 1

first and second TE01δ-mode dielectric resonators disposed so as to oppose to each other

Methodology Applied

Scientific EffectElectromagnetic resonance: Resonance

Implementation Method 2

an opposing interval between the first and second dielectric resonators is variable

Methodology Applied

Scientific EffectElectromagnetic coupling:

Data Source

PatentUS10559865B2Band pass filter comprising sets of first and second dielectric resonators disposed within a housing, where the first and second dielectric resonators have an adjustable interval there between

Publication Date: 2020.02.11 NEC CORP

AI summary

A band pass filter suitable for varying the center frequency of the passband and a method for controlling the band pass filter are provided. A band pass filter of the present invention includes: two TE01δ-mode dielectric resonators (10) and (20) disposed so as to oppose to each other; and a housing (30) made of metal enclosing the two dielectric resonators (10) and (20). An opposing interval between two dielectric resonators (10) and (20) is variable.