Development of dual-band circularly polarised reflectarray
Bibliographic record
Abstract
The development of a dual-band circularly polarised microstrip reflectarray in Ka-band is presented and various reflectarray configurations with different cell elements are introduced. Among these, reflectarrays with separate crossed dipoles or orthogonal nonintersecting dipoles etched on the same or different substrate interfaces were investigated theoretically and experimentally. Adjusting the lengths of the orthogonal dipoles or arms of the cross dipoles was used to maintain 90° relative phase shift between the orthogonal components of reradiated fields and this gives rise to the realisation of a reflectarray that converts the linearly polarised incident field of the feed into an outgoing circularly polarised field. Various realisations of reflectarrays in terms of cell elements and configuration were designed, fabricated and tested. Measurement results for the final prototype that was of superior performance compared to the other prototypes demonstrated 36% aperture efficiency and axial ratio better than 2.0 dB, for 3% bandwidth on both the Tx and Rx bands.
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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) | 0.001 | 0.000 |
| 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 | 0.001 |
| 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".