Antenna Windows for Convertible Base Covers

Solution Overview

Problem

Convertible devices face antenna gain degradation due to frequency shifts when transitioning from laptop to tablet mode, caused by dielectric loading of plastic windows replacing metal parts near the antenna slots, leading to suboptimal wireless communication performance.

Innovation Solution

The implementation of a combination of non-metallic and metallic structures within the antenna window, where the metallic structure is positioned substantially below the antenna slot in the tablet mode, preventing significant frequency shifts and maintaining antenna performance across mode changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If plastic windows replace metal parts near antenna slots to improve RF clearance, then antenna gain is improved, but frequency shifts occur due to dielectric loading

Engineering Contradiction:

Improveantenna gainVSAvoidfrequency stability

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The base cover is designed with different material properties in different regions: a first portion with plastic material providing RF clearance, and a second portion with metal material providing electromagnetic shielding. This local differentiation allows the antenna window region to have plastic properties (reducing dielectric loading) while other regions maintain metal properties (providing shielding), thus resolving the contradiction between antenna gain and frequency stability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The base cover utilizes a composite structure combining plastic and metal materials in a single component. The plastic portion reduces dielectric loading effects on the antenna, while the metal portion provides electromagnetic shielding. This composite approach allows simultaneous achievement of improved antenna gain through plastic RF clearance and maintained frequency stability through metal shielding properties.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If metal parts are used near antenna slots to provide electromagnetic shielding, then shielding effectiveness is improved, but antenna gain degrades due to dielectric loading

Engineering Contradiction:

Improveelectromagnetic shieldingVSAvoidantenna gain

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The base cover is designed with different material properties in different regions: a first portion with plastic material providing RF clearance, and a second portion with metal material providing electromagnetic shielding. This local differentiation allows the antenna window region to have plastic properties (reducing dielectric loading) while other regions maintain metal properties (providing shielding), thus resolving the contradiction between antenna gain and frequency stability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The base cover utilizes a composite structure combining plastic and metal materials in a single component. The plastic portion reduces dielectric loading effects on the antenna, while the metal portion provides electromagnetic shielding. This composite approach allows simultaneous achievement of improved antenna gain through plastic RF clearance and maintained frequency stability through metal shielding properties.

Inventive Principle:

Principle #40Composite materials

3Adaptability or versatility

If the device transitions from laptop to tablet mode, then usability is improved, but antenna performance degrades due to frequency shifts

Engineering Contradiction:

Improvemode flexibilityVSAvoidantenna performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The base cover is designed with different material properties in different regions: a first portion with plastic material providing RF clearance, and a second portion with metal material providing electromagnetic shielding. This local differentiation allows the antenna window region to have plastic properties (reducing dielectric loading) while other regions maintain metal properties (providing shielding), thus resolving the contradiction between antenna gain and frequency stability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The base cover utilizes a composite structure combining plastic and metal materials in a single component. The plastic portion reduces dielectric loading effects on the antenna, while the metal portion provides electromagnetic shielding. This composite approach allows simultaneous achievement of improved antenna gain through plastic RF clearance and maintained frequency stability through metal shielding properties.

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

This configuration ensures minimal antenna gain degradation and frequency shifts when the device is switched from laptop to tablet mode, maintaining effective wireless communication capabilities.

Implementation Method 1

caused by dielectric loading of plastic windows replacing metal parts near the antenna slots

Methodology Applied

Scientific EffectDielectric loading: Dielectric

Data Source

PatentEP3580634B1Antenna windows for base covers

Publication Date: 2022.05.04 HEWLETT PACKARD DEVELOPMENT COMPANY LP

Figure 1~2
Figure 3~4A
Figure 4B~5

AI summary

In one example, a base cover for a lower housing of a convertible device is described, which may include a metal body and an antenna window attached to the metal body. The antenna window may include a non-metallic structure and a metallic structure disposed within the non-metallic structure such that the metallic structure corresponds to an antenna slot defined in an upper housing of the convertible device.