Beam‐squint minimization in series‐slotted waveguide array antennas using double negative materials
Bibliographic record
Abstract
Abstract A 5 × 1 series‐slotted waveguide array antenna partly filled with double positive (DPS) and double negative (DNG) materials is investigated. The DNG material has a negative wave vector and its guided‐wavelength equals that of the DPS material. Two simple straight slotted waveguides, one filled only with the DPS material and the other with both DPS and DNG materials, are designed and studied. It is found that the latter waveguide has repeated voltage standing wave shapes. This unique characteristic is utilized to minimize the beam squinting effect in the series‐fed array antennas. It is shown that in a 5 × 1 array using both DPS and DNG materials, the variation in the direction of its beam and boresight gain are limited to 0.5 ° and 0.8 dB, respectively, within a 10% frequency band. In the corresponding conventional array these parameters were 5 ° beam tilt and 3.3 dB boresight gain loss. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1789–1792, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21800
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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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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".