Detection Plate Movable Attenuator Range Adjustment
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Solution Overview
Problem
Existing detection plates for vehicle access control face variability in reading range due to differing electromagnetic wave attenuation through vehicle windshields, leading to inconsistent identification and potential interference, requiring vehicle-type-specific manufacturing or sensitivity adjustments.
Innovation Solution
A detection plate with a uniformly structured chip, coupling element, and antenna conductor, where a damping element is used to adjust the reception sensitivity by varying its distance or coverage, ensuring a consistent reading range through a contactless coupling network, and a carrier holder for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiving sensitivity of the reading device is increased to achieve reliable reading in vehicles with strong damping, then the reading range is extended for such vehicles, but the reading range becomes excessively large for vehicles with low damping, causing interference between adjacent readers
Solution Approach 1:
The patent applies a movable damping element that can be positioned at different locations relative to the antenna conductor, allowing the reading range to be dynamically adjusted. This resolves the contradiction by enabling the system to adapt its reading range according to the specific vehicle type, maintaining reliable reading in high-damping vehicles while preventing excessive range and interference in low-damping vehicles.
Solution Approach 2:
The patent changes the physical parameter of the antenna system by introducing a damping element whose position can be varied. By adjusting the position of this damping element, the electromagnetic field characteristics are modified, thereby changing the reading range parameter to match different vehicle environments without requiring different detection plate designs.
2Reliability
If detection plates are manufactured with different ranges for different vehicle types, then the reading reliability is improved for each vehicle type, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent makes a single detection plate design universal for all vehicle types by incorporating a movable damping element that can be positioned to accommodate different vehicle characteristics. This eliminates the need to manufacture separate detection plates for different vehicle types, thereby maintaining high reading reliability across all vehicles while simplifying manufacturing processes and reducing costs.
Solution Approach 2:
The movable damping element provides dynamic adaptability, allowing the same detection plate structure to be configured for different vehicle types. This dynamic configuration capability replaces the need for multiple static designs, achieving universality and simplifying manufacturing while maintaining optimal performance for each vehicle type.
3Length of moving object
If a damping element is placed close to the coupling element to reduce the reading range, then the reading range is reduced to prevent interference, but the coupling between the chip and antenna conductor is affected
Solution Approach 1:
The patent uses a coupling element as an intermediary between the chip and antenna conductor, and introduces a damping element that can be positioned independently. The coupling element maintains reliable electrical coupling while the damping element, when positioned appropriately, reduces the reading range without interfering with the coupling function. This separation of functions resolves the contradiction between range reduction and coupling reliability.
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 reliable and consistent identification of individuals across different vehicle types without increasing the range undesirably, allowing for adjustable damping to maintain optimal reading range, reducing manufacturing complexity and interference.
Implementation Method 1
a damping element (64) which is brought mechanically close to a coupling element (16) between the chip (14) and the antenna conductor (18)
Implementation Method 2
The chip receives the energy required to operate the chip without contact from the reader. Both the data transmission and the energy transmission take place through an electromagnetic field.
Data Source
Figure 1~2
Figure 3~4
Figure 5a~5c
AI summary
A detection plate is described, comprising a chip module (10) consisting of a chip (14) and a coupling element (16) connected to the chip (14), and an antenna module (12) consisting of an antenna conductor (18). The coupling element (16) is coupled to the antenna conductor (18) without contact. An adjustable attenuator is arranged near the coupling element (16), projecting into the coupling field that establishes the contactless coupling and attenuates only this field, thereby reducing the transmit and receive range of the detection plate relative to a maximum value.