Microwave Photonics Beamforming Networks for Phased Array Antennas
Bibliographic record
Abstract
Phased array antennas (PAAs) are radiating structures composed of multiple antenna elements usually disposed in one- or two-dimension configurations, which are individually and coherently fed by means of either variable phase or true time delay (TTD) control elements, in order to scan a complex radiation pattern to a given angular direction in space. PAAs are mainly employed in radar and radio-frequency communication systems where there is a need to produce a directive beam that can be scanned in response to an input control signal. This chapter provides a comprehensive treatment of the use of microwave photonics subsystems and technologies in the implementation of the beamforming network in PAA structures. It deals with broadband optical beamforming networks where the control elements are implemented by optical TTDs. The chapter describes the work reported based on several technologies such as integrated ring resonators, semiconductor optical amplifiers, and stimulated Brillouin scattering in optical fibers.
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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 | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.011 | 0.003 |
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".