Electrical Radiator with Ring Conductor for Vehicle Antennas

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Solution Overview

Problem

Designing vehicle antennas that can efficiently cover multiple radio services with narrow frequency bands and different polarizations while maintaining mechanical stability and minimizing size, is challenging due to the need for complex matching networks that increase production costs and reduce bandwidth.

Innovation Solution

A radiator design featuring a horizontally oriented conductor loop with multiple vertically oriented radiators electromagnetically coupled to the loop, allowing for low-impedance resonance and impedance matching to standard 50 ohms, enabling efficient coverage of vertically polarized radio signals with a small electrical height and stable mechanical structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single broadband antenna is designed to cover multiple radio services with different polarizations, then the antenna should be able to serve multiple functions, but the design becomes extremely complex and practically insurmountable

Engineering Contradiction:

Improvecoverage of multiple radio servicesVSAvoidantenna design complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent divides the antenna system into separate specialized antennas for different radio services rather than using a single broadband antenna. Each antenna is optimized for specific frequency bands and polarizations, making the overall system manageable and effective while avoiding the complexity of a universal antenna design

Inventive Principle:

Principle #1Segmentation

2Length of stationary object

If the antenna height is minimized for vehicle installation, then the antenna size is reduced, but the radiation gain and bandwidth are significantly reduced

Engineering Contradiction:

Improveantenna heightVSAvoidradiation gain

Core Design Contradiction:

Length of stationary objectVSPower

Solution Approach 1:

The patent uses composite structures combining conductive materials with dielectric resonators to create compact antennas that achieve enhanced radiation gain and bandwidth despite minimal height. The composite design allows electrically small antennas to overcome traditional size-gain trade-offs

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the operating parameters by using resonant frequencies and impedance matching techniques to maximize radiation efficiency from compact structures. By optimizing the electrical characteristics rather than physical dimensions, the antenna achieves high gain despite small size

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If complex matching networks are used to match low radiation resistance to 50 ohms, then impedance matching is achieved, but the production cost increases and manufacturing precision requirements increase

Engineering Contradiction:

Improveimpedance matchingVSAvoidproduction cost

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The patent modifies the antenna structure to inherently provide radiation resistance closer to 50 ohms through optimized geometry and material selection, eliminating the need for complex matching networks. This reduces manufacturing complexity and cost while maintaining proper impedance matching

Inventive Principle:

Principle #35Parameter changes

4Volume of moving object

If the antenna structure is made compact with small footprint, then the antenna can be integrated into vehicle bodies, but the mechanical stability and vibration resistance are compromised

Engineering Contradiction:

Improveantenna footprintVSAvoidmechanical stability

Core Design Contradiction:

Volume of moving objectVSStability of the object's composition

Solution Approach 1:

The patent employs planar and flexible antenna structures that can be integrated into vehicle surfaces while maintaining mechanical stability. The designs use thin-film technologies and conformal structures that adapt to vehicle body contours without compromising vibration resistance

Inventive Principle:

Principle #30Flexible shells and thin films

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 radiation gain, mechanical stability, and economical mass production, with the ability to combine with other antennas and adapt to additional frequency ranges, while maintaining a small form factor and efficient impedance matching.

Implementation Method 1

at least three vertical radiators (4a, 4b, 4c) which are electromagnetically coupled to the ring conductor (2) at conductor loop coupling points (7a, 7b, 7c)

Methodology Applied

Scientific EffectElectromagnetic coupling: Electromagnetic Induction

Implementation Method 2

so that a low-impedance resonance of the character of a series resonance is given at the radiator feed point (5) at the frequency fo

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentEP2693565B1Electrical radiator for vertically polarised radio signals

Publication Date: 2019.11.27 DELPHI DEUTLAND

Figure 1a~1b
Figure 2a~2b
Figure 3

AI summary

The emitter (1) has polygonal or elliptical/circular closed ring conductor that forms horizontally oriented conductor loop. Three vertical emitters (4a,4b) are electromagnetically coupled to ring conductor at conductor loop coupling points (7a-7c). The vertical emitters are coupled to electrically conductive base area (6) between coupling points and earth terminal point (3a-3c). The vertical emitter is excited via emitter infeed point (5), so that low-resistance resonance provided with character of series resonance is provided at infeed point.