Dielectric Waveguide Resonator With Floating Internal Conductor

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Solution Overview

Problem

Dielectric waveguide filters used in millimeter waveband applications face challenges in achieving a high Q factor and low insertion loss due to high electric field strength between via conductors and conductor layers, leading to significant resistance loss.

Innovation Solution

The implementation of a dielectric waveguide resonator with a floating internal conductor that is electrically isolated from the surface conductors, reducing current concentration and thereby enhancing the Q factor and minimizing insertion loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If via conductors are used to connect conductor layers in a dielectric waveguide resonator, then electrical connection between layers is achieved, but high electric field strength between via conductors and conductor layers causes significant resistance loss and reduces Q factor

Engineering Contradiction:

ImproveQ factorVSAvoidresistance loss

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent removes the via conductor from the system entirely, replacing it with a combination of surface conductors and dielectric structures. This extraction eliminates the source of high resistance loss while maintaining the necessary electrical connections through alternative means (surface conductors and capacitive coupling), thereby resolving the contradiction between achieving electrical connection and minimizing energy loss.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a dielectric structure as an intermediary element that enables electrical connection between conductor layers without direct metal-to-metal contact. This dielectric mediator allows for capacitive coupling while avoiding the high resistance loss associated with via conductors, thus improving the Q factor and reducing energy loss.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If conventional conductor structures are used in dielectric waveguide resonators, then manufacturing is simplified, but current concentration at via conductor ends increases resistance loss

Engineering Contradiction:

Improveconductor structure fabricationVSAvoidcurrent concentration loss

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The patent extracts the problematic via conductor element from the conventional structure, eliminating current concentration at via ends. The replacement surface conductor configuration distributes current more evenly, reducing resistance loss while remaining compatible with standard manufacturing processes for surface-mounted conductors.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent modifies the local quality of the conductor structure by transitioning from vertical via conductors to horizontal surface conductors. This local structural change alters the current distribution pattern, preventing concentration at specific points and thereby reducing energy loss without complicating the overall manufacturing process.

Inventive Principle:

Principle #3Local quality

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 allows for the attainment of a dielectric waveguide resonator with a high Q factor and a dielectric waveguide filter with low insertion loss, effectively addressing the limitations of existing technologies.

Implementation Method 1

a dielectric waveguide resonant space which is surrounded by the first surface conductor, the second surface conductor, and the connection conductor

Methodology Applied

Scientific EffectElectromagnetic resonance: Resonance

Implementation Method 2

since a dielectric material which is low in dielectric loss can be used for a dielectric waveguide resonator

Methodology Applied

Scientific EffectDielectric loss: Dielectric

Data Source

PatentUS12206149B2Dielectric waveguide resonator and filter including at least one internal conductor physically isolated from first and second surface conductors and overlapping therewith

Publication Date: 2025.01.21 MURATA MFG CO LTD

AI summary

A dielectric waveguide filter includes a dielectric plate including first and second principal surfaces facing each other and a side surface connecting outer edges of the first and second principal surfaces, a first surface conductor at the first principal surface, a second surface conductor at the second principal surface, a side conductor film inside the dielectric plate and connecting the first and second surface conductors, and an internal conductor extending in a perpendicular direction to the first principal surface and electrically connected to neither the first surface conductor nor the second surface conductor. Dielectric waveguide resonant spaces are surrounded by the first surface conductor, the second surface conductor, and the side conductor film.