Batteryless UHF-RFID Memory-Enabled Sensor for the Detection of Entry Point Openings
Bibliographic record
Abstract
This paper presents a novel batteryless RFID sensor tag for detecting the opening of entry points. To address the common issue of temporary loss of reader-tag communication-especially in crowded environments with multiple tags-a custom-designed 1-bit memory circuit is proposed that retains sensor data for a user-defined duration until communication is re-established. The tag employs a three-port structure to embed sensor data into the phase of the reader's reflected signal. An energy harvesting block, including a matched doublediode rectifier and a boost converter with an internal bulk converter, provides a regulated voltage to power the memory circuit. A prototype was implemented and tested successfully, demonstrating an <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$S_{11}$</tex> below -20 dB and approximately 60° phase variation at the reader side between logic states 0 and 1, confirming reliable operation and easy detection of the sensor state.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".