Split Ring Resonator With Radial Stubs for Broadband RF Suppression

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Solution Overview

Problem

Existing technologies face challenges in effectively suppressing noise and RF signal propagation in active RF circuits, particularly at high frequencies above 20 GHz, due to limitations in lumped element filters and space constraints on PCBs.

Innovation Solution

The implementation of an enhanced broadband ring resonator (EBRR) with a split ring resonator structure and embedded radial stubs, which provides improved spectral suppression and wide-band noise rejection on power supply and digital signal lines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If lumped element filters are used for noise suppression, then isolation is improved below 20 GHz, but spectral suppression becomes inadequate at frequencies above 20 GHz

Engineering Contradiction:

Improvenoise suppression capabilityVSAvoidfrequency range coverage

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent transitions from lumped element filters to distributed resonant structures, changing the fundamental operating parameters to achieve effective noise suppression at frequencies above 20 GHz where traditional lumped elements become inadequate

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The resonant structure is divided into multiple segments including series resonant structures and shunt resonant structures, allowing the filter to achieve broad spectral suppression across multiple frequency bands through coordinated operation of individual segments

Inventive Principle:

Principle #1Segmentation

2Reliability

If additional lumped elements are added to increase isolation, then noise suppression is improved, but available layout space on PCB is reduced

Engineering Contradiction:

Improveisolation between power traces and signalsVSAvoidPCB layout space

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent combines multiple filter functions into a single integrated resonant structure that provides both series and shunt filtering capabilities, eliminating the need for separate lumped elements and reducing overall PCB footprint

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The resonant structures are implemented using planar transmission line geometries on the PCB surface, utilizing two-dimensional space more efficiently than traditional three-dimensional lumped element configurations

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Area of stationary object

If resonant structures are integrated into internal copper layers, then space utilization is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvespace utilization on PCBVSAvoidintegration complexity into PCB

Core Design Contradiction:

Area of stationary objectVSEase of manufacture

Solution Approach 1:

The resonant structures are designed to perform multiple functions simultaneously - providing both series and shunt filtering, achieving broad spectral suppression, and utilizing internal copper layers for space efficiency - all within a single integrated design that manages manufacturing complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Reliability

If conical inductors are used for filtering, then SRF is improved above 35 GHz, but reliability under shock and vibration events deteriorates

Engineering Contradiction:

Improveself-resonant frequencyVSAvoidstructural stability under mechanical stress

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent replaces mechanical conical inductor structures with planar resonant structures implemented as printed circuit board traces, eliminating mechanical vulnerability to shock and vibration while maintaining high-frequency operation through distributed inductance and capacitance

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

The EBRR design achieves effective noise suppression and wide-band noise rejection at high frequencies, reducing signal attenuation and enhancing system performance, while also minimizing space requirements on PCBs.

Implementation Method 1

a split ring resonator with at least one radial stub to enable the split ring resonator to have a plurality of resonant frequencies

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS20250167415A1Enhanced broadband ring resonator for improved spectral suppression

Publication Date: 2025.05.22 RAYTHEON CO

AI summary

A broadband ring resonator including a substrate, a conductive trace on the substrate comprising a first end and a second end, wherein the conductive trace encloses an interior region except for a gap between the first end and the second end, and at least one radial stub integrated into the conductive trace and a method of enhancing a bandwidth of a split ring resonator including acquiring a substrate, forming a conductive trace on the substrate comprising a first end and a second end, wherein the conductive trace encloses an interior region except for a gap between the first end and the second end, and integrating at least one radial stub into the conductive trace.