Loop Antenna in Light Mixing Chamber for RF Shielding
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Solution Overview
Problem
The complexity of manufacturing and assembly in solid state lighting units with multiple components complicates the integration of antennas, affecting performance and heat dissipation.
Innovation Solution
A lighting unit design featuring a loop-shaped antenna mounted within an upper housing that forms a light mixing chamber, spaced from the driver circuitry and heat sink, reducing component complexity and optimizing heat dissipation while enhancing antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple components are mounted in different positions within the lighting device, then the antenna can be integrated into the device, but the manufacturing and assembly complexity increases
Solution Approach 1:
The patent combines the antenna mounting function with the upper housing structure. The retaining members are integrated into the upper housing, and the antenna is positioned within the mixing chamber formed by the housing itself. This merging of functions reduces the number of separate components and simplifies assembly while maintaining antenna integration.
Solution Approach 2:
The upper housing serves multiple functions: it forms the light mixing chamber, provides structural support, and incorporates retaining members for antenna mounting. This multi-functionality eliminates the need for separate antenna mounting structures, reducing manufacturing and assembly complexity while ensuring reliable antenna integration.
2Device complexity
If the antenna is placed close to the driver circuitry and heat sink, then the device structure is simplified, but the antenna performance deteriorates due to RF shielding
Solution Approach 1:
The patent extracts the antenna from the vicinity of the driver circuitry and heat sink by positioning it within the upper housing's mixing chamber. The retaining members hold the antenna at a distance from the heat-generating components, preventing RF shielding while maintaining a simplified device structure through integrated housing design.
Solution Approach 2:
The patent utilizes the vertical dimension by positioning the antenna within the upper housing above the driver circuitry and heat sink. This spatial separation in the vertical dimension avoids RF shielding from metallic components while maintaining structural simplicity through the housing integration.
3Device complexity
If a stub antenna is used instead of a loop-shaped antenna, then the device complexity is reduced, but the antenna performance is compromised
Solution Approach 1:
The patent merges the loop-shaped antenna structure with the housing-mounted retaining members. The loop configuration is integrated into the upper housing structure, providing improved antenna performance while maintaining manufacturing feasibility through the combined housing-antenna mounting design.
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 design simplifies assembly, improves antenna performance by minimizing RF shielding, and achieves a near omnidirectional radiation pattern, allowing for a compact and efficient solid state lighting unit with enhanced RF communication capabilities.
Implementation Method 1
a loop-shaped antenna, wherein the upper housing comprises retaining members which hold the loop-shaped antenna... achieves a near omnidirectional radiation pattern
Implementation Method 2
The light emitting element is placed outside the reflecting structure. The reflecting structure reflects light toward an optical element which can have diffusion particles
Implementation Method 3
The lighting device comprises a heat sink made of a material with an electrical resistivity being less than 0.01 Ωm (e.g. a metallic heat sink) which is part of the housing and transports heat away from the light source
Data Source
AI summary
A lighting unit comprises a solid state lighting element (10). An upper housing (18) forms a light mixing chamber (20) over the solid state lighting element (10) and a loop-shaped antenna (22) is held by the upper housing (18), wherein the upper housing (18) comprises a reflective inner wall at least where it defines the mixing chamber (20) and said solid state lighting element (10) is inside said reflective inner wall. This makes use of the component which defines the mixing chamber (20) to hold a loop-shaped antenna (22) in place above the lighting element (10) and therefore away from the heat generated by the lighting element (10) and away from any metallic heat sink or heat spreading components (16).