Laminated Balun Capacitor Coil Spatial Separation

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Solution Overview

Problem

Existing laminated structural type baluns have room for improvement in electrical properties due to the overlap of capacitor and coil areas in the laminated direction, which affects magnetic field interference and overall performance.

Innovation Solution

A laminated structural type balun design where the first and second capacitors are arranged in different areas from the first and second coils when viewed from the laminated direction, reducing magnetic field interference and allowing for improved electrical properties while maintaining a low profile.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If capacitors and coils are arranged in overlapping areas in the laminated direction, then the device structure is compact, but the electrical properties deteriorate due to magnetic field influence

Engineering Contradiction:

Improvedevice compactnessVSAvoidelectrical properties

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent transitions from two-dimensional planar arrangement to three-dimensional laminated arrangement, stacking capacitor and coil patterns across multiple insulating layers. This dimensional change allows components to occupy different spatial zones while maintaining compact footprint, resolving the contradiction between compactness and electrical performance by separating overlapping areas in the vertical dimension.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent embeds capacitor patterns within the laminated structure between and around coil patterns across multiple layers. The capacitor and coil patterns are nested in different zones of the laminated body, with capacitors positioned in areas that do not overlap with coils when viewed from the laminated direction, allowing both components to coexist in a compact volume without magnetic field interference.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of manufacture

If capacitors are positioned to overlap with coils in the laminated direction, then manufacturing is simplified, but insertion loss and phase difference performance worsen

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidinsertion loss

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The patent divides the laminated body into multiple insulating layers with conductor patterns formed on each layer. Capacitor patterns are segmented across specific layers (e.g., first capacitor on first insulating layer, second capacitor on second insulating layer) while coil patterns are positioned on other layers, creating distinct functional zones that prevent overlap and reduce magnetic field influence on capacitor performance.

Inventive Principle:

Principle #1Segmentation

3Area of stationary object

If capacitors and coils are arranged in the same area in the laminated direction, then the device footprint is reduced, but amplitude difference and reflection loss performance deteriorate

Engineering Contradiction:

Improvedevice footprintVSAvoidsignal conversion performance

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The patent utilizes the vertical dimension of the laminated structure to separate capacitor and coil patterns that would otherwise occupy the same planar area. By arranging capacitors and coils in different zones across multiple laminated layers, the design maintains a small device footprint while preventing magnetic field interference, thus preserving signal conversion performance.

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

The design enhances electrical properties by minimizing magnetic field interference, resulting in improved insertion loss, phase difference, amplitude difference, and reflection loss, particularly in targeted frequency bands for wireless-local area networks and Bluetooth applications.

Implementation Method 1

a low pass filter that is provided between an unbalanced terminal inputting and outputting unbalanced signals and a first balanced terminal inputting and outputting balanced signals and includes a first coil and a first capacitor; a high pass filter that is provided between the unbalanced terminal and a second balanced terminal inputting and outputting balanced signals and includes a second capacitor and a second coil

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS9083310B2Laminated structural type balun

Publication Date: 2015.07.14 TDK CORP

AI summary

A laminated structural type balun includes a low pass filter that is provided between an unbalanced terminal inputting and outputting unbalanced signals and a first balanced terminal inputting and outputting balanced signals and includes a first coil and a first capacitor; and a high pass filter that is provided between the unbalanced terminal and a second balanced terminal inputting and outputting balanced signals and includes a second capacitor and a second coil. The first capacitor and the second capacitor are arranged in a different area from the first coil and the second coil in a laminated direction.