Antenna module

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Solution Overview

Problem

Existing antenna modules are challenged by their compact design requirements, which often result in a short transmission and reception range due to the influence of nearby conductive objects, and struggle with resonance frequency stability when multiple detection plates are adjacent.

Innovation Solution

The antenna module features a mechanically shortened dipole with electrically lengthened conductor routing, shifting the electromagnetic field's ratio in favor of the magnetic component to reduce interference from conductive objects, while maintaining omnidirectional characteristics and increased transmission range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If a stretched dipole antenna is used to increase transmission range, then the electrical component of the electromagnetic field increases, but conductive objects in the near field detune the antenna more strongly

Engineering Contradiction:
Improvetransmission rangeVSAvoiddetuning by conductive objects
Core Design Contradiction:
Length of moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent changes the geometric parameters of the dipole antenna by folding the conductor back onto itself, creating a compact structure with loops and meandering sections. This transforms the linear stretched dipole into a space-efficient configuration that maintains electrical length while reducing physical footprint and near-field conductive object interference.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The antenna conductor is routed in multiple dimensions with folds, loops, and meandering sections instead of a simple linear arrangement. This multi-dimensional routing achieves the required electrical length within a compact physical space, reducing the antenna's vulnerability to detuning by nearby conductive objects.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If the antenna conductor is mechanically shortened for compact design, then the physical size decreases, but the electrical length must be increased through conductor routing to maintain resonance

Engineering Contradiction:
Improveantenna sizeVSAvoidconductor routing complexity
Core Design Contradiction:
Volume of moving objectVSDevice complexity

Solution Approach 1:

The antenna conductor is divided into distinct functional sections: first sections extending from coupling coils, second sections bending at angles, third sections meandering parallel to second sections, and fourth sections forming closed loops. This segmentation allows systematic routing that achieves electrical lengthening while maintaining organizational simplicity.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The antenna incorporates curved and folded conductor paths including loops and meandering sections instead of straight lines. These curved configurations increase the electrical length within a compact physical footprint, achieving the required resonance properties without excessive conductor routing complexity.

Inventive Principle:
Principle #14Spheroidality (Curvature)

3Length of moving object

If stretched dipole configuration is used, then transmission range increases, but the antenna exhibits pronounced directivity

Engineering Contradiction:
Improvetransmission rangeVSAvoidomnidirectional characteristic
Core Design Contradiction:
Length of moving objectVSEase of operation

Solution Approach 1:

The patent employs asymmetric folding patterns where third sections meander parallel to second sections and fourth sections form closed loops at various positions. This asymmetric yet balanced configuration maintains omnidirectional radiation characteristics while achieving the required electrical length for extended transmission range.

Inventive Principle:
Principle #4Asymmetry

Solution Approach 2:

Multiple conductor sections (second, third, and fourth sections) are merged into a unified folded structure that combines the benefits of extended electrical length with omnidirectional radiation patterns. The integrated configuration maintains balanced electromagnetic field distribution in all directions.

Inventive Principle:
Principle #5Merging (Combining)

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 enhances the separation of neighboring detection plates, stabilizes resonance frequency, and increases bandwidth, allowing for effective operation in diverse environments with varying conductive object densities.

Implementation Method 1

The chip module is arranged on the antenna module and the coupling loop of the chip module is inductively coupled to a coupling winding of the antenna module

Methodology Applied
Scientific EffectInductive coupling: Electromagnetic Induction

Implementation Method 2

shifting the electromagnetic field's ratio in favor of the magnetic component to reduce interference from conductive objects

Methodology Applied
Scientific EffectElectromagnetic field manipulation: Electromagnetic Induction

Implementation Method 3

mechanically shortened dipole with electrically lengthened conductor routing, shifting the electromagnetic field's ratio in favor of the magnetic component

Methodology Applied
Scientific EffectResonance: Resonance

Data Source

PatentEP2767934B1Antenna module
Publication Date: 2017.11.01 ASTRA GESELLSCHAFT FUR ASSET MANAGEMENT MBH & CO KG
  • EP2767934B1 patent drawingFigure 1~2

AI summary

An antenna module (10) consisting of a support (12) and an antenna conductor (14) arranged thereon is described. The antenna conductor (14) consists of a coupling coil (18) and two radiator elements (20, 22) branching off from the coupling coil (18), each consisting of several sections. First sections (24, 26) extend from the coupling coil (18) and initially move away from it. At the ends of the first sections (24, 26), second sections (28, 30) of the radiator elements (20, 22) follow, which bend at least once at an angle to the adjacent first sections (24, 26), and at least parts of these second sections (28, 30) converge and approach each other. The second sections (28, 30) end at locations (32, 34) that are closer together than the ends of the first sections (24, 26).The second sections (28, 30) are followed by third sections (36, 38) which bend immediately at the ends of the second sections (28, 30) opposite the second sections (28, 30) or from which parts of the third sections (36, 38) bend further along the third sections (36, 38).