Compact Slotted Cavity-Back Antenna with Wideband Circular Polarization for UHF RFID Readers
Bibliographic record
Abstract
This communication presents the design and comprehensive evaluation of an RFID reader antenna tailored for UHF applications ($868-915 \text{MHz}$). The proposed design incorporates a metallic rectangular cavity, two arc-shaped planar feeding elements, and an annular slot extruded on the upper surface of the cavity. By combining these elements, the antenna achieves an operational bandwidth of 11.4 % and directivity of$\mathbf{8. 1 3 ~ d B i}$at$\mathbf{8 6 8 ~ M H z}$and$\mathbf{8. 4 9 ~ d B i}$at$\mathbf{9 1 5 ~ M H z}$. Moreover, the antenna consistently maintains an axial ratio below 1.6 dB at both frequencies, ensuring excellent circular polarization performance. The radiation pattern's -3 dB beamwidth exceeds 71°, which provides a wide coverage area suitable for complex communication environments. These performance characteristics demonstrate that the proposed antenna design is highly effective for enhancing the reliability and efficiency of RFID systems in various industrial and logistics applications.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.002 |
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".