Tunable Resonance Cavity with Multi-Layer Dielectric and Metal Patch

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Solution Overview

Problem

Existing antenna and filter combinations face challenges in achieving wide bandwidth and high rejection characteristics while maintaining reliability and cost-effectiveness, particularly due to limitations in tuning resonance frequencies using traditional PCB materials with limited permittivity and thickness options, leading to increased insertion loss and reduced design flexibility.

Innovation Solution

The proposed resonance cavity design incorporates multiple dielectric layers with different permittivity and thickness, along with a metal patch that can be externally adjusted, allowing for flexible tuning of resonance frequencies and enabling compact, low-cost filter arrangements with improved frequency characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If traditional PCB materials with limited permittivity and thickness options are used, then manufacturing cost and reliability are improved, but design flexibility and tuning capability of resonance frequencies are worsened

Engineering Contradiction:

Improvemanufacturing costVSAvoiddesign flexibility

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The dielectric structure is segmented into multiple layers with different permittivity values and thicknesses. This segmentation allows independent optimization of each layer's contribution to the overall resonance frequency, enabling fine-tuning capabilities while using standard PCB materials for each layer, thus maintaining manufacturing ease.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses composite dielectric structures combining multiple PCB material layers with different permittivity characteristics. This composite approach creates an effective medium with tailored electromagnetic properties, achieving continuous resonance frequency tuning ranges that exceed what single-material PCBs can provide, while remaining compatible with standard manufacturing processes.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If the size of the electromagnetical shielding is altered to change resonance frequency, then resonance frequency tuning is improved, but footprint area is worsened

Engineering Contradiction:

Improveresonance frequency tuningVSAvoidfootprint area

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The invention achieves resonance frequency tuning by changing the electromagnetic parameters (permittivity and thickness) of the dielectric layers rather than altering the physical dimensions of the electromagnetical shielding. This parameter-based tuning approach allows frequency adjustment while maintaining a fixed, compact footprint area.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If microstrip or slot resonators are used to construct filters, then ease of manufacture is improved, but Q-factor and insertion loss are worsened

Engineering Contradiction:

Improveease of manufactureVSAvoidQ-factor

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The invention transitions from two-dimensional microstrip or slot resonator structures to a three-dimensional cavity resonator structure formed by electromagnetical shielding around stacked dielectric layers. This dimensional transition creates a enclosed volume that supports higher Q-factor resonance modes while remaining manufacturable using standard PCB lamination and via-hole techniques.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 design allows for the realization of resonance cavities and filter arrangements with enhanced frequency tuning capabilities, reduced insertion loss, and increased design flexibility, enabling the creation of reliable and cost-effective antenna elements and wireless devices with improved performance.

Implementation Method 1

the shape of the metal patch affects a resonance frequency of the resonance cavity

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

an electromagnetically shielded enclosure having at least one aperture is arranged to enclose part of the first and second layers of dielectric material and the metal patch

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Implementation Method 3

a first layer of dielectric material associated with a first dielectric constant and a first thickness, and a second layer of dielectric material associated with a second dielectric constant different from the first dielectric constant and a second thickness

Methodology Applied

Scientific EffectDielectric permittivity: Dielectric Permittivity

Data Source

PatentUS11670832B2Tunable resonance cavity

Publication Date: 2023.06.06 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A resonance cavity comprising a first layer of dielectric material having a first dielectric constant and a first thickness, a second layer of dielectric material having a second dielectric constant different from the first dielectric constant and a second thickness, a metal patch arranged between the first and the second layer of dielectric material, and an electromagnetically shielded enclosure having at least one aperture, the electromagnetically shielded enclosure arranged to enclose part of the first and second layers of dielectric material and the metal patch.