Modulated Frequency-Selective Doubly Curved Sub-Reflector for a Dual-Band Multiple Spot Beam Communication Satellite Antenna System
Bibliographic record
Abstract
An antenna solution for broadband communication satellite applications is presented. The proposed antenna design provides a full dual-band (Tx/Rx) four-color multibeam coverage of Europe in K/Ka-band while utilizing only a single main reflector aperture. This solution is especially relevant for smaller platforms and secondary payloads. The antenna system consists of an offset Cassegrain antenna combining two multiple-feed-per-beam (MFB) feed clusters and a doubly curved modulated frequency-selective surface (FSS) sub-reflector, which is the key enabling technology validated in this work. By utilizing a modulated FSS design, the antenna system fulfills all radio frequency (RF) requirements that were specified on the antenna coverage parameters. An engineering model (EM) of the doubly curved FSS sub-reflector has been designed and fabricated. Its RF performance was characterized experimentally, and good agreement has been observed between simulations and measurements, thus validating the proposed concept.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 | 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".