Multilayer Coupler with Mode-Compensating Bend Plate

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Solution Overview

Problem

Conventional couplers face challenges in maintaining balanced coupling across bends, leading to coupling losses and reduced bandwidth, especially at higher frequencies, due to the inherent properties of electromagnetic coupling and the length of cascaded couplers.

Innovation Solution

The implementation of a multilayer coupler design with a ground plane and electromagnetically coupled planar signal conductors, featuring a floating-potential plate and strategically positioned openings in the ground plane to compensate for coupling losses in bends, allowing for balanced even-mode and odd-mode propagation and maintaining coupling throughout the coupler.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If cascaded couplers are used to achieve greater than octave bandwidth at higher frequencies, then bandwidth is improved, but the coupler becomes very long and lossy

Engineering Contradiction:

ImprovebandwidthVSAvoidcoupler length

Core Design Contradiction:

Adaptability or versatilityVSLength of moving object

Solution Approach 1:

The patent embeds a compensation plate within the existing coupler structure, placing it between the ground plane and signal conductors. This nested approach allows the compensator to be integrated into the coupler's internal geometry rather than adding external length, achieving bandwidth extension without proportionally increasing overall coupler length

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The invention addresses the length-bandwidth tradeoff by operating in the vertical dimension between the ground plane and signal conductors. The compensation plate is positioned in this third dimension (spaced from both ground plane and conductors), allowing electromagnetic field manipulation without extending the horizontal length of the coupler

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If the coupler length exceeds one-quarter wavelength, then bandwidth coverage is improved, but coupling rolls off and loss increases

Engineering Contradiction:

Improvebandwidth coverageVSAvoidcoupling loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent converts the harmful effect of bends (which cause coupling loss) into a beneficial configuration. By positioning compensation plates at bend locations and using ground plane openings aligned with these bends, the structure recovers coupling that would otherwise be lost, turning the problematic bend region into a compensated zone that maintains coupling balance

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The compensation plate acts as an intermediary element between the ground plane and signal conductors. This intermediate structure modifies the electromagnetic field distribution to compensate for coupling losses, particularly at bend regions, without directly contacting or shorting the signal conductors

Inventive Principle:

Principle #24Intermediary (Mediator)

3Volume of moving object

If bends are introduced in signal conductors to achieve compact configuration, then space utilization is improved, but coupling balance is degraded

Engineering Contradiction:

Improvecoupler footprintVSAvoidcoupling balance

Core Design Contradiction:

Volume of moving objectVSStability of the object's composition

Solution Approach 1:

The patent applies local compensation at bend regions rather than uniformly across the entire coupler. Compensation plates are strategically positioned at bend locations with ground plane openings aligned to these specific regions, creating localized field modification that restores coupling balance only where needed, preserving compact bend geometry while fixing local coupling imbalances

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 design achieves improved coupling balance across bends, reducing the need for increased coupling in other parts of the coupler and maintaining a wide bandwidth, while being practical for construction and use in compact configurations.

Implementation Method 1

electromagnetically coupled planar first and second signal conductors spaced from and parallel to the ground plane

Methodology Applied

Scientific EffectElectromagnetic coupling: Electromagnetic Induction

Data Source

PatentUS10418680B1Multilayer coupler having mode-compensating bend

Publication Date: 2019.09.17 WERLATONE INC

AI summary

A multilayer coupler may include electromagnetically coupled planar first and second signal conductors that are separated by a gap, extend adjacent each other along a ground plane, and change orientation in a bend. A plate may be positioned along the bend between the ground plane and the signal conductors. The ground plane may have an opening extending along the bend and the plate. A multilayer coupler may include two coupled signal conductors formed in a loop having a four-wire section in which different sections of the two signal conductors overlap in a four-wire section. In a transition region in which the coupler transitions from the four-wire section to a two-wire section, an isolating ground plane may separate the two two-wire sections extending from the four-wire section. A bend in the transition region may include a plate between the two signal conductors and the ground plane.