RFID Antenna Interference for Spatial Detection Control
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Solution Overview
Problem
Existing RFID systems face challenges in reliably and inexpensively limiting the transmission range, particularly in UHF systems, due to varying transponder sensitivities and the difficulty in controlling the detection area, which leads to inefficient and incomplete detection of transponders.
Innovation Solution
The method involves using an additional antenna that generates a signal that interferes with the transmission signal of the main antenna, reducing the sensitivity of transponders and spatially limiting the transmission range by ensuring the additional antenna's signal is either of the same or a different frequency, modulated, or inverted, thereby disrupting communication between the transponder and the main antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the transmission range is extended to detect more transponders, then the detection coverage is improved, but unintentional detection of transponders outside the intended zone occurs
Solution Approach 1:
The patent applies preliminary anti-action by using additional antennas to transmit interfering signals that preemptively prevent transponders outside the intended zone from being detected. The interfering signals are transmitted in advance to create a null zone or dead zone where transponders cannot respond, thus preventing unwanted detections before they occur.
Solution Approach 2:
The patent converts the harmful effect of signal interference into a beneficial spatial filtering mechanism. By intentionally introducing interfering signals from additional antennas, the system creates controlled zones where transponders are prevented from responding, thus converting signal interference from a nuisance into a useful tool for defining precise detection boundaries.
2Reliability
If the transmission power is increased to improve detection reliability, then the detection reliability is improved, but the energy consumption increases
Solution Approach 1:
The patent applies periodic action by transmitting interfering signals only during specific time intervals when detection is required, rather than continuously. The additional antennas transmit interfering signals periodically or on-demand based on detection needs, reducing overall energy consumption while maintaining detection reliability when required.
Solution Approach 2:
The patent changes transmission parameters dynamically by adjusting the power and timing of interfering signals from additional antennas based on detection requirements. The system modifies transmission parameters such as signal strength, duration, and timing to achieve reliable detection only when necessary, thereby reducing overall energy consumption.
3Measurement precision
If multiple directional antennas are used to limit transmission range, then the spatial precision is improved, but the device complexity increases
Solution Approach 1:
The patent applies multi-functionality by using additional antennas that serve dual purposes: they both extend detection coverage in certain directions and simultaneously create interfering signals to prevent detection in other directions. This single component performs multiple functions, reducing the need for separate directional antennas and simplifying the overall system.
Solution Approach 2:
The patent inverts the conventional approach by using additional antennas not primarily for extending coverage but for creating controlled interference zones. Instead of using multiple directional antennas to shape the beam, the system uses omnidirectional or broad-beam antennas combined with interfering signals to achieve spatial precision, effectively inverting the traditional method.
4Productivity
If continuous transmission is used to maintain detection capability, then the detection availability is improved, but the energy consumption increases
Solution Approach 1:
The patent applies periodic action by implementing intermittent transmission schedules where the additional antennas transmit interfering signals only during specific intervals when detection is required. The system alternates between transmission and idle periods, maintaining detection availability when needed while significantly reducing overall energy consumption compared to continuous transmission.
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 approach effectively limits the transmission range to specific areas, preventing unintentional detection of transponders outside the intended zone, while reducing energy consumption and avoiding the need for continuous transmission, thus enhancing the efficiency and precision of transponder detection.
Implementation Method 1
the at least one additional antenna transmits at least one additional signal at least temporarily during the reception process of the transmission signal by the transponder, and that the additional signal disturbs or reduces in intensity the transmission signal received by the at least one transponder
Implementation Method 2
In the RF range, energy and data transmission are based on the magnetic coupling of the alternating fields of the reader and the transponder in close proximity
Implementation Method 3
The antenna coil and the resonant capacitor form an electrical resonant circuit and are tuned to their operating frequency
Data Source
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AI summary
The invention relates to a method for detecting at least one transponder with a radio system comprising at least one reader, at least one transmit/receive antenna, and at least one transponder, wherein: - at least one additional antenna is provided, - the at least one additional antenna transmits at least one additional signal at least temporarily during the reception of the transmitted signal by the transponder, - the additional signal interferes with or reduces the intensity of the transmitted signal received by the at least one transponder from the at least one transmit/receive antenna, - the at least one transmit/receive antenna and the at least one additional antenna have spatially distinct transmission ranges. Furthermore, the invention relates to a radio system.