Circularly Polarized Square Loop Shaped Passive RFID Transponder for Thin UHF Applications in Random Mobility Use
Bibliographic record
Abstract
A Circularly polarized square-loop shaped passive RFID tag antenna is proposed, studied and designed in this paper. The design consists of a metallic square-loop, fed by two strips on the basis of a T-match structure in order to ensure matching in impedance between the chip and the antenna. The loop is excited via two points to have a 90° phase difference ensuring, therefore, circularly polarized radiation. The designed antenna shows an impedance bandwidth (IBW) ranging from 893 to 944 MHz (51 MHz) within an axial ratio bandwidth (ARBW) starts from 892 up to 947 MHz (55 MHz) in bidirectional circularly polarized broadside radiation. The proposed structure shows a high gain of 2.82 dBic with an extremely low axial ratio of 0.15 dB at 915 MHz in a reading range up to 12.83 meters. In addition, the antenna shows a high flexibility and repeatability in the band occupying a very compact area at a height of 0.00005λ. With the performance achieved, the proposed transponder may be considered as a good choice for thin labels in random mobility.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".