Coupled Antennas in Lighting Devices for RF Signal Optimization
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Solution Overview
Problem
Existing lighting devices with RF antennas face performance issues due to interference from conductive materials, which can shield or alter the resonant frequency of RF signals, limiting their communication range and compatibility.
Innovation Solution
A lighting device with a first compact antenna and a second larger antenna that are electromagnetically coupled, allowing for adjustable coupling by moving the second antenna's supporting portion relative to the first, enhancing omnidirectional radiation patterns and communication range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single compact antenna is used in the lighting device, then the device dimensions remain compact, but the antenna efficiency and bandwidth are limited
Solution Approach 1:
The antenna system is segmented into two distinct portions: a first antenna portion integrated into the lighting device housing and a second antenna portion integrated into the lamp head. This segmentation allows each antenna to be optimized for different functions - the first antenna provides compact integration while the second antenna enhances radiation efficiency and bandwidth through its larger size and strategic positioning.
Solution Approach 2:
The patent implements a nested antenna configuration where the first antenna portion is electrically connected to and embedded within the lighting device housing, while the second antenna portion is embedded within the lamp head. The antennas are positioned in close proximity with their respective supporting portions movable relative to each other, creating a nested structural arrangement that maximizes space utilization while maintaining electrical performance.
2Strength
If conductive materials are placed near the RF antenna, then structural support and heat dissipation are improved, but the RF signal is shielded and resonant frequency is altered
Solution Approach 1:
The patent extracts the second antenna portion from the main lighting device housing and relocates it to the lamp head assembly. This separation removes the antenna from the immediate vicinity of conductive heat dissipation structures, thereby reducing RF signal shielding and resonant frequency alterations while maintaining structural support functions in the housing.
Solution Approach 2:
The patent introduces non-conductive or RF-transparent materials as intermediaries between the antenna portions and conductive structural elements. These intermediary materials allow structural support and heat dissipation functions to be maintained while preventing harmful RF signal interactions with conductive components.
3Reliability
If the second antenna portion is made larger to improve radiation pattern, then omnidirectional communication is enhanced, but the overall device complexity increases
Solution Approach 1:
The patent merges the functional requirements of both compact integration and enhanced radiation by combining two antenna portions into a single integrated system. The first antenna portion provides compact electrical connection within the housing, while the second antenna portion provides enhanced omnidirectional radiation in the lamp head, with both portions working together as a unified RF communication system.
Solution Approach 2:
The patent implements a dynamic antenna configuration where the second portion supporting the second antenna is movable with respect to the first portion supporting the first antenna. This dynamic arrangement allows the antenna system to adapt its configuration for optimal performance while maintaining a relatively simple overall structure that can be adjusted rather than requiring multiple fixed complex antenna arrangements.
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 improves antenna efficiency, bandwidth, and compatibility, enabling reliable RF communication over a wide range while maintaining compact dimensions, suitable for low-energy replacement lamps with remote control capabilities.
Implementation Method 1
a second antenna electromagnetically coupled with the first antenna so that the second antenna is adapted to be excited by and to excite the first antenna
Implementation Method 2
the second portion of the lighting device is movable with respect to the first portion of the lighting device
Data Source
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AI summary
Presented is a lighting device (100) with a light source and a heat dissipating element, comprising: an RF communication circuit (102); a first antenna (105) electrically connected to the RF communication circuit and supported by a first portion (1 15) of lighting device; and a second antenna (125) adapted to communicate with external devices and electromagnetically coupled with the first antenna so that the second antenna is adapted to be excited by and to excite the first antenna, the second antenna is adapted to communicate with external devices and being supported by a second portion of the lighting device, wherein the second portion of the lighting device is movable with respect to the first portion of the lighting device.