Antenna Frequency Stabilization in Slidable Portable Devices

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Solution Overview

Problem

Portable electronic devices with slidable housings experience a shift in antenna frequency response when moved between open and closed positions, leading to undesirable changes in frequency bands, particularly affecting lower frequency sensitivity.

Innovation Solution

Incorporation of a low frequency shield and a high frequency chassis resonator, which are sized and configured to anchor the frequency response of the antenna, preventing shifts in frequency bands by acting as a ground and enhancing sensitivity respectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a slidable housing design is used to enable open and closed positions, then device functionality and user interaction are improved, but the antenna frequency response shifts and lower frequency sensitivity deteriorates

Engineering Contradiction:

Improvedevice functionalityVSAvoidantenna frequency response stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

A low frequency shield is positioned near the antenna to preemptively counteract the frequency response shift caused by housing movement. The shield creates a stable electromagnetic reference that prevents the antenna from drifting to lower frequencies when the housing transitions between open and closed positions.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

A high frequency resonator is coupled to the antenna to alter the electromagnetic parameters of the system. The resonator introduces a resonant frequency component that stabilizes the antenna's high frequency response, compensating for the parameter changes that occur during housing movement.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If the housing is moved between open and closed positions, then device portability and user access are improved, but frequency band shifts occur particularly affecting lower frequency sensitivity

Engineering Contradiction:

Improveuser accessVSAvoidfrequency band stability

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The low frequency shield is strategically positioned to preemptively counteract the frequency response shift before it significantly impacts lower frequency sensitivity. By establishing a stable electromagnetic reference in advance, the shield prevents harmful frequency drift during housing transitions.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The shield and resonator act as intermediary elements between the antenna and the moving housing structure. These intermediaries isolate the antenna from the mechanical movement, absorbing or compensating for the electromagnetic disturbances caused by housing position changes.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If no frequency stabilization components are added, then device complexity is reduced, but antenna frequency response stability and sensitivity deteriorate

Engineering Contradiction:

Improvestructure simplicityVSAvoidfrequency response consistency

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

Instead of redesigning the entire device structure, the solution applies localized frequency stabilization components (low frequency shield and high frequency resonator) specifically near the antenna. This targeted approach maintains overall device simplicity while providing precise frequency response control where it is most needed.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The frequency stabilization system combines different electromagnetic components (shield and resonator) that work together as a composite solution. The shield handles low frequency stabilization while the resonator addresses high frequency response, creating a multi-functional stabilization system that maintains consistency across the entire frequency range.

Inventive Principle:

Principle #40Composite materials

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 effectively stabilizes the antenna's frequency response, preventing shifts in lower frequency bands and improving high frequency sensitivity, ensuring consistent device operation across positions.

Implementation Method 1

low frequency shield and a high frequency chassis resonator, which are sized and configured to anchor the frequency response of the antenna, preventing shifts in frequency bands by acting as a ground

Methodology Applied

Scientific EffectGround effect: Ground Effect

Implementation Method 2

low frequency shield and a high frequency chassis resonator, which are sized and configured to anchor the frequency response of the antenna, preventing shifts in frequency bands by acting as a ground and enhancing sensitivity respectively

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS8965465B2Portable electronic device having at least one of resonator and shield

Publication Date: 2015.02.24 MALIKIE INNOVATIONS LTD

AI summary

In some aspects, a portable electronic device, having a rear housing, an upper housing coupled to the rear housing and slideable relative thereto between a closed position and an open position, an antenna, and at least one element coupled to the antenna and configured to perform at least one of inhibiting low frequency shift and increasing high frequency sensitivity of the antenna.