A Single-Layer Wideband Ku-Band Reflectarray for Satellite Applications
Bibliographic record
Abstract
This paper presents a wideband, circularly polarized, single-layer reflectarray design, with a bandwidth sufficient to cover both a downlink band from 10.7 - 12.75 GHz and an uplink band from 13.75 - 14.5 GHz. The unit cell is based on a double circular loop that also features an air gap for enhanced bandwidth. The unit cell design is optimized with a group delay-based approach, which is done by optimizing the unit cell geometry and analyzing the impact of the air gap on the linearity of the phase curves. This unit cell design has a phase range of about 500°, thereby minimizing the number of phase wraps required in the reflectarray layout. A circular prototype with a diameter of 11.7λ at 11.725 GHz is fabricated to validate its performance, exhibiting a 1 dB bandwidth of 34% and peak gain of 28 dBi with a clear agreement with simulated results. The reflectarray is intended to be used in satellite applications whereby the downlink and uplink bands are contained within the operating bandwidth of the proposed design.
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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 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 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".