Hf transmission path in a domestic appliance
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Solution Overview
Problem
Domestic appliances with metallic housings, which provide shielding from electromagnetic radiation, face challenges in implementing wireless communication capabilities due to the shielding effect, making it difficult and costly to provide reliable wireless communication.
Innovation Solution
Incorporating a communication unit and an external antenna, along with a waveguide structure, which can be arranged on or within the touch-sensitive screen, to transmit and receive electromagnetic signals with minimal attenuation, using a dielectric layer and resonant coupling to facilitate efficient signal transmission through the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metallic housing is used for shielding electromagnetic radiation, then shielding effectiveness is improved, but wireless communication capability deteriorates
Solution Approach 1:
The housing is segmented by introducing discontinuities in the form of waveguide structures with specific dimensions. These segmented portions allow certain electromagnetic frequencies to pass through while maintaining shielding for other frequencies, thus resolving the contradiction between shielding effectiveness and wireless communication capability.
Solution Approach 2:
The housing structure is modified locally at specific positions where waveguide structures are introduced. These local modifications create frequency-selective transmission paths that enable wireless communication at designated frequencies while preserving the overall shielding effectiveness of the metallic housing for other frequencies.
2Adaptability or versatility
If a waveguide structure is introduced for signal transmission, then wireless communication capability is improved, but housing shielding effectiveness deteriorates
Solution Approach 1:
The waveguide structures are designed with specific dimensional parameters (width, height, length) that are carefully selected to create frequency-selective behavior. By changing these parameters, the housing can be made transparent to specific communication frequencies while maintaining shielding effectiveness for other frequencies, thus resolving the contradiction.
3Device complexity
If the communication unit is placed inside the housing, then device integration is improved, but signal transmission quality deteriorates
Solution Approach 1:
The waveguide structure acts as an intermediary between the communication unit inside the housing and the external environment. It provides a controlled transmission path that maintains signal quality by guiding electromagnetic waves through the housing walls, thus enabling both high integration and high transmission quality.
4Reliability
If an external antenna is added for signal transmission, then wireless communication reliability is improved, but device complexity increases
Solution Approach 1:
The housing structure is designed to serve multiple functions: it provides mechanical protection, electromagnetic shielding, and simultaneously acts as part of the antenna system through the integrated waveguide structures. This multi-functionality improves wireless communication reliability while minimizing the increase in device complexity.
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 cost-effective and reliable wireless communication capabilities in appliances with shielding housings by minimizing signal loss and providing a flexible, efficient path for electromagnetic signals, allowing for efficient communication with external partners.
Implementation Method 1
using a dielectric layer and resonant coupling to facilitate efficient signal transmission through the housing
Implementation Method 2
The waveguide structure can have a dielectric layer on which the conductor track is arranged
Data Source
Figure 1a~1c
Figure 2a
Figure 2b
AI summary
A domestic appliance is disclosed, which comprises a housing (200). In addition, the domestic appliance comprises a communications unit (201) and an outer antenna (103, 122), which are configured to receive or send an electromagnetic signal. The communications unit (201) is arranged in the housing (200). In addition, the domestic appliance comprises a touch-sensitive screen (300), which is arranged on an outer wall (210) of the housing (200). The outer antenna (103, 122) is arranged in or on the touch-sensitive screen (300) in such a way that an electromagnetic signal can be sent to a receiver outside the housing (200) or received from a sender outside the housing (200) by means of the outer antenna (103, 122).