Broadband substrate-integrated-waveguide six-port applied to the development of polarimetric imaging radiometer
Bibliographic record
Abstract
In this paper, a Ka-band broadband substrate integrated waveguide (SIW) six-port technique proposed for polarimetric imaging radiometer is reported. Conventional polarimetric radiometer systems generally consist of a phase discriminator composed of couplers, crossovers and external loads. A six-port is proposed for the first time to replace this discriminator. This approach presents advantages such as lower cost and smaller size. Furthermore, the use of SIW technology allows integrability, compactness and low interference susceptibility. Simulation and measurement results show that the proposed six-port can operate over 20% of bandwidth centered at 34 GHz. To the knowledge of the authors, the achieved bandwidth is higher than other SIW six-ports reported in the literature. To validate the proposed application, the six-port is integrated in a front-end receiver. Measurements show achieved polarimetric channel symmetry of 1 dB and isolation of 29 dB which presents excellent performances. This six-port architecture presents advantages for implementation in passive millimeter-wave remote sensing systems.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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".