Transponder Coil Orientation for Stable Time Base Signal
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Solution Overview
Problem
Existing transponders cannot generate a time base signal independent of their position and spatial orientation relative to the interrogator, which is necessary for synchronization, due to signal cancellation issues when coils are aligned differently.
Innovation Solution
A transponder with at least two coils having non-parallel axes, each equipped with a full-wave rectifier, generates a pulsating sum signal with a frequency twice that of the interrogation signal through summing rectified receive signals, ensuring stable signal generation regardless of orientation, and further processing using a comparator, low pass, and frequency divider to produce clock signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three coils are arranged orthogonally to each other for providing supply voltage independent of position and spatial orientation, then the supply voltage can be provided substantially independent of the transponder's position and spatial orientation, but it is not possible to generate a time base signal which corresponds with the frequency of the interrogation signal for synchronizing the transponder
Solution Approach 1:
The patent divides the coil system into two separate functional groups: three orthogonal coils (L1, L2, L3) dedicated to power supply generation, and at least two additional coils (L4, L5) with non-parallel axes dedicated to time base signal generation. This segmentation allows each group to optimize its specific function without interference, resolving the contradiction between power independence and synchronization capability
Solution Approach 2:
The additional coils L4 and L5 serve multiple purposes: they generate the time base signal for synchronization while also contributing to the overall signal reception. The full-wave rectifiers and summing elements process these coil outputs to generate both the time base signal and supplement the power supply, achieving multi-functionality that resolves the original contradiction
2Ease of manufacture
If coils are used as antennas for receiving wireless electromagnetic signals, then they can convert the magnetic component into a wired electrical signal, but they have a distinct directivity causing reception minimum when the axis is oriented toward the transmitter
Solution Approach 1:
The patent combines multiple coils (L4 and L5 with non-parallel axes) into a unified signal processing system where their outputs are summed after full-wave rectification. This merging ensures that at least one coil operates outside its reception minimum at any given orientation, maintaining stable signal levels while preserving the inherent directivity characteristics of individual coils
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
The solution enables reliable generation of a time base signal for synchronizing the transponder with the interrogator, even with amplitude-modulated interrogation signals, and maintains signal stability across various orientations, enhancing the transponder's operational independence from spatial alignment.
Implementation Method 1
with a first coil acting as an antenna for generating a first wired electrical receive signal from the interrogation signal, and with at least one further coil acting as an antenna for generating a further wired electrical receive signal from the interrogation signal
Data Source
AI summary
Proposed is a transponder for receiving a wireless electromagnetic interrogation signal and for transmitting a wireless electromagnetic response signal with a first coil acting as an antenna for generating a first wired electrical receive signal from the interrogation signal, and with at least one further coil acting as an antenna for generating a further wired electrical receive signal from the interrogation signal, wherein an axis of the first coil and an axis of the further coil are aligned differently in the space, wherein in each case one full-wave rectifier for rectifying the respective receive signal is assigned to the coils, wherein a summing element for summing up the rectified receive signals generated by the full-wave rectifiers is provided in order to generate in this manner a pulsating sum signal, the frequency of which corresponds to twice the frequency of the interrogation signal.