Vehicle-Embedded Antenna Ground Bracket for Polarization

Solution Overview

Problem

Existing vehicle-body-embedded antenna devices face challenges in achieving superior horizontal and vertical polarization characteristics, especially when concealed within a vehicle's roof, leading to inadequate reception of vertical polarization components.

Innovation Solution

A vehicle-body-embedded antenna device comprising a grounded antenna element with a flat plate-like portion parallel to the roof surface, a circuit board with a coil connected to the antenna element for supporting additional frequency bands, and a ground bracket directly grounded to a conductive vehicle body member at an angle different from the roof surface, enhancing polarization sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If the antenna element is set parallel to the roof surface for concealed design, then the horizontal polarization characteristic is satisfactory, but the vertical polarization characteristic becomes inferior

Engineering Contradiction:

Improveantenna element orientationVSAvoidvertical polarization reception

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The patent introduces a ground bracket that extends in a direction different from the roof surface angle, creating a three-dimensional ground structure. This vertical dimension complementarity allows the antenna to receive both horizontal and vertical polarization components while maintaining a concealed flat design on the roof surface.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The ground bracket acts as an intermediary element between the antenna element and the vehicle body ground. By positioning it at a different angle than the roof surface, it mediates the polarization reception, enabling the antenna to capture vertical polarization components without compromising the concealed horizontal design.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Shape

If the antenna device is embedded into the roof surface for good exterior design, then the appearance is improved, but the antenna cannot receive vertical polarization components

Engineering Contradiction:

Improveconcealed designVSAvoidpolarization reception capability

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The patent introduces a ground bracket that extends in a direction different from the roof surface angle, creating a three-dimensional ground structure. This vertical dimension complementarity allows the antenna to receive both horizontal and vertical polarization components while maintaining a concealed flat design on the roof surface.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent applies different orientations to different parts of the grounding system. The antenna element remains parallel to the roof surface for concealed design, while the ground bracket is positioned at a different angle to provide vertical polarization reception capability, creating local quality differentiation.

Inventive Principle:

Principle #3Local quality

3Ease of operation

If the antenna element is disposed parallel to the roof surface, then the horizontal polarization is the main polarization, but the antenna device cannot receive vertical polarization components

Engineering Contradiction:

Improveinstallation simplicityVSAvoidvertical polarization sensitivity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent introduces a ground bracket that extends in a direction different from the roof surface angle, creating a three-dimensional ground structure. This vertical dimension complementarity allows the antenna to receive both horizontal and vertical polarization components while maintaining a concealed flat design on the roof surface.

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 solution improves both horizontal and vertical polarization characteristics, enabling effective reception of various frequency bands while maintaining a concealed design, and allows for embedding within the vehicle body without compromising aesthetics.

Implementation Method 1

a coil placed on the circuit board and connected to the power feeding part to which the antenna element is connected for making the antenna element to have an antenna length supporting a second frequency band

Methodology Applied

Scientific EffectInductive effect: Electromagnetic Induction

Implementation Method 2

a ground bracket serving as a ground of the circuit board, and directly grounded to a conductive member of the vehicle body which is provided at an angle different from an angle of the roof surface for improving polarization sensitivity

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS11233318B2Vehicle-body-embedded antenna device

Publication Date: 2022.01.25 HARADA IND CO LTD

AI summary

A vehicle-body-embedded antenna device includes an antenna element, a circuit board, a coil and a ground bracket. The antenna element of a grounded type has an antenna capacitance adapted to function as a capacitive antenna that supports a first frequency band, and main polarization thereof is polarization substantially parallel to the roof surface. The coil is placed on the circuit board and connected to the power feeding part to which the antenna element is connected for making the antenna element to have an antenna length supporting a second frequency band. The ground bracket is directly grounded to a conductive member of the vehicle body which is provided at an angle different from an angle of the roof surface for improving polarization sensitivity of the antenna element substantially perpendicular to the roof surface.