Dishwasher Multi-Antenna Design to Overcome Faraday Shield Signal Loss
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Solution Overview
Problem
Dishwashers with metal tubs act as Faraday shields, preventing wireless signals from escaping and making remote communication challenging due to their electrical connection to earth ground, which limits antenna coverage and signal strength.
Innovation Solution
The implementation of a dishwasher with two antennas, one on the front and one on the rear, strategically positioned to create a bound area for the radio, minimizing cable length and reducing signal dissipation, providing a substantially spherical coverage pattern and overcoming the Faraday shield effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single antenna is mounted on the dishwasher housing, then remote communication is enabled, but signal coverage is limited and cable length increases causing signal dissipation
Solution Approach 1:
The patent divides the single antenna system into multiple antennas (first antenna on front surface, second antenna on rear surface). This segmentation allows the radio to be positioned within a bound area defined by multiple antennas, reducing cable length from each antenna to the radio and minimizing signal dissipation while improving coverage.
Solution Approach 2:
The patent transitions from a single-point antenna location to a distributed spatial arrangement. By placing antennas on both front and rear surfaces of the housing, the system creates a three-dimensional bound area that encompasses the radio, optimizing cable routing and reducing total cable length.
2Area of stationary object
If the radio is positioned far from antennas, then cable length increases, but signal coverage area expands; however, increased cable length causes greater signal dissipation
Solution Approach 1:
By using multiple antennas positioned at different locations (front and rear surfaces), the system segments the coverage area into multiple zones. The radio positioned within the bound area created by these segmented antenna locations achieves both extensive coverage and minimized cable lengths to each antenna segment.
3Strength
If the dishwasher housing is constructed entirely of metal for durability, then structural strength is improved, but wireless signal transmission is blocked due to Faraday shield effect
Solution Approach 1:
The patent applies local quality by positioning antennas on external surfaces of the metal housing where they can access electromagnetic fields. The metal housing maintains its structural integrity while antennas mounted on its surfaces (front and rear) penetrate the Faraday shield effect locally at the antenna-housing interface, enabling wireless communication without compromising overall housing strength.
Solution Approach 2:
The antennas serve as intermediaries between the internal radio system and external wireless signals. By mounting antennas on the external surfaces of the metal housing, the system creates an interface that mediates between the Faraday-shielded interior and the external electromagnetic environment, enabling signal transmission while maintaining the metal housing's protective function.
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 enables effective wireless communication with external devices, such as home routers, regardless of their location, while minimizing cable loss and ensuring complete antenna coverage, even when the dishwasher is near metal objects.
Implementation Method 1
most dishwashers are primarily constructed of metal that is electrically connected to earth ground, which acts as a large Faraday shield and does not allow wireless signals to escape the dishwasher
Data Source
AI summary
A household appliance, such as a dishwasher, for treating an item, such as a dish, in a treating chamber according to at least one automatic cycle of operation includes multiple antennas for transmitting and receiving data with an external network. The multiple antennas can be coupled with a radio also located within the appliance.