Parametric study of short backfire antennas with different cavity profiles
Bibliographic record
Abstract
A number of high aperture efficiency waveguide fed horn arrays have been investigated at millimetre wave frequencies for civil application. Short backfire antennas are a low profile alternative to horns, having a height of about 0.5/spl lambda//sub 0/, as opposed to several wavelengths. A large scale, dual polarised, waveguide fed array of short backfire antennas (SBA) has been proposed for DBS television reception (about 12 GHz). Such structurally robust and readily die cast arrays are also of interest for upperband MMDS, LMCS and LMDS subscriber antenna (25.35-31.3 GHz). However, waveguide fed SBAs are not well understood and have only been studied for a few distinct cavity diameters and depths. Also, a number of gain enhancement techniques have been trialed, but this work has also been sketchy. There is, thus, a need for a wide-ranging parametric study of SBAs before arraying can be considered, and a modern numerical tool such as Ansoft HFSS(TM) ver. 6.0 would be applicable. As an initial study, 5 different circularly symmetric cavity profiles fed by a rectangular waveguide were investigated across a range of diameters.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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 teacher head, 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".