Planar Antenna Tuning via High-Permittivity Dielectric Layer

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Solution Overview

Problem

Patch antennas struggle to be precisely tuned to specific radiation profiles due to limitations in existing designs.

Innovation Solution

A planar antenna design incorporating a second dielectric substrate layer with high relative permittivity above the conductive patch area, allowing for adjustable radiation characteristics by varying the thickness and position of this layer, as well as incorporating recesses to fine-tune the antenna's properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a second substrate layer with low relative permittivity is used to protect the effective area, then the protective function is achieved, but the radiation characteristic cannot be tuned precisely

Engineering Contradiction:

Improveprotective functionVSAvoidradiation characteristic tuning

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the relative permittivity parameter of the second substrate layer from low (prior art) to high (greater than or equal to the first substrate layer's permittivity). This parameter change enables the second layer to actively influence radiation characteristics while maintaining protective function, resolving the contradiction between protection and tuning capability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The second substrate layer is designed to perform multiple functions simultaneously: it protects the effective area (original function) and tunes the radiation characteristic (new function). By selecting materials with high relative permittivity, the same layer structure achieves both protective and tuning roles, eliminating the need for separate tuning mechanisms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the second substrate layer thickness is increased to improve radiation tuning, then the tuning capability is enhanced, but the antenna structure becomes more complex

Engineering Contradiction:

Improveradiation characteristic tuningVSAvoidantenna structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent utilizes the thickness parameter of the second substrate layer as a tuning variable. By adjusting the thickness within a specific range (greater than 10% of the first substrate layer thickness, preferably 20-80%), the radiation characteristics can be tuned without requiring additional complex structures or components.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces thickness variation in the vertical dimension as a tuning parameter. Instead of adding more layers or complex horizontal structures, the solution exploits the vertical dimension (thickness of the second substrate layer) to achieve radiation characteristic tuning, maintaining structural simplicity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Manufacturing precision

If material is removed from the substrate layers to tune radiation characteristics, then the tuning precision is improved, but the manufacturing process becomes more difficult

Engineering Contradiction:

Improveradiation characteristic tuning precisionVSAvoidproduction process

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent incorporates tuning features (recesses, openings, or varying thickness regions) directly into the substrate layer fabrication process. By preparing the second substrate layer with different thicknesses or removing material in specific patterns during the manufacturing process itself, the antenna achieves precise radiation tuning without requiring additional post-processing steps.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent combines the protective function and tuning function into a single integrated second substrate layer structure. The same layer that protects the effective area also contains the tuning features (recesses, varying thickness), merging multiple functions into one component and simplifying the overall manufacturing process.

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

Enables easy tuning of radiation characteristics, enhancing the antenna's performance by influencing the electromagnetic field radiation effectively.

Implementation Method 1

A second dielectric substrate layer with a second relative permittivity is located as the uppermost layer of the antenna on the electrically conductive effective area, the second relative permittivity being larger or equal to the first relative permittivity

Methodology Applied

Scientific EffectDielectric permittivity: Dielectric Permittivity

Data Source

PatentUS7626547B2Embedded planar antenna with pertaining tuning method

Publication Date: 2009.12.01 KATHREIN AUTOMOTIVE GMBH

AI summary

A patch antenna comprising an electrically conductive ground plane; a first dielectric substrate layer arranged on said ground plane and having a first relative permittivity; at least one electrically conductive effective area arranged on the first dielectric substrate layer and electrically connected to one end of an electrically conductive feed line; at least one second dielectric substrate layer arranged on the effective area and having a second relative permittivity; whereby the second relative permittivity is larger or equal the first relative permittivity.