Elevator Antenna Diversity for Fading Suppression
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Solution Overview
Problem
Elevator devices face challenges in maintaining reliable wireless communication due to fading effects caused by changing antenna positions within the hoistway, requiring multiple antennas on the elevator car, which complicates maintenance and reduces workspace for personnel.
Innovation Solution
The elevator device incorporates multiple wireless receivers installed on rotatable support mechanisms on the elevator car, allowing for fine adjustment of antenna positions to minimize fading influences while ensuring a work space for maintenance personnel, using diversity processing to generate a synthetic radio wave with consistent intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas are installed on the elevator car to generate a synthetic radio wave for suppressing fading effects, then communication reliability is improved, but the device complexity and maintenance difficulty increase
Solution Approach 1:
The patent divides the antenna system into multiple separate antennas (first antenna and second antenna) that are spatially separated and mounted on different parts of the elevator car. Each antenna operates independently to receive radio waves, and their signals are combined through diversity processing to generate a synthetic radio wave, thereby suppressing fading effects while maintaining manageable system complexity
Solution Approach 2:
The patent combines the signals from multiple independently operating antennas through diversity processing to generate a single synthetic radio wave. This merging of multiple signal sources improves communication reliability by ensuring that if one antenna experiences fading, the synthetic signal maintains adequate quality through contributions from other antennas
2Reliability
If multiple antennas are installed on the elevator car to improve communication reliability, then fading effects are suppressed, but the work space for maintenance personnel is reduced
Solution Approach 1:
The patent positions antennas at specific locations on the elevator car where they can be effectively mounted without obstructing maintenance work spaces. The first antenna is mounted on the upper surface while the second antenna is mounted on the lateral surface, utilizing different spatial zones to minimize interference with maintenance activities while maintaining communication reliability
Solution Approach 2:
The patent utilizes three-dimensional space on the elevator car by mounting antennas on different surfaces (upper surface and lateral surface). This spatial distribution in multiple dimensions allows adequate separation between antennas and maintenance work areas, ensuring both communication reliability and sufficient work space for maintenance personnel
3Reliability
If antennas are positioned to optimize signal reception, then communication quality is improved, but the installation complexity increases
Solution Approach 1:
The patent designs antenna mounting structures that serve multiple functions: they provide secure antenna attachment, enable adjustable positioning for signal optimization, and maintain compatibility with the elevator car's existing structure. The support mechanisms can be configured in different positions to accommodate both optimal signal reception and ease of installation
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 effectively suppresses fading effects and maintains reliable wireless communication between the hoistway control board and elevator car control device, ensuring a sufficient work space for maintenance personnel by optimizing antenna placement and intensity.
Implementation Method 1
wireless transmitter provided to a top portion of the hoistway; multiple wireless receivers provided to an upper portion of the elevator car
Implementation Method 2
a guide roller that grips the guide rail
Implementation Method 3
a support mechanism that rotatably supports the guide roller
Data Source
AI summary
An elevator device has multiple antennas installed to an elevator car to generate a synthetic radio wave, where each antenna is arrangeable to suppress the influence of fading while securing a work space for workers The elevator device mediates wireless communications for communications between a control board of a hoistway and a control device of the elevator car and includes: a guide rail installed to the hoistway; the elevator car that moves up and down while being guided by the guide rail; a wireless transmitter provided to the top portion of the hoistway; multiple wireless receivers provided to the upper portion of the elevator car; a guide roller that grips the guide rail; and a support mechanism that rotatably supports the guide roller. At least one of the multiple wireless receivers is installed to the upper portion of the support mechanism provided to the top surface of the elevator car.