A Ring Choke Excited Compact Dual-Mode Circular Waveguide Feed for Offset Reflector Antennas
Bibliographic record
Abstract
A simple ring choke excited compact dual-mode circular waveguide feed, for offset reflector antennas, is proposed. It consists of a central round waveguide with a single longitudinal slot opening to a surrounding single choke of circular cross-section. It generates the${\rm TE}_{11}$mode inside the waveguide and the higher order${\rm TE}_{21}$mode inside the ring choke, with a quadrature phase difference. The proposed design, therefore, separates the two modes spatially, and isolates the input waveguide from the detrimental effects of the higher order${\rm TE}_{21}$mode. It thus provides a wide impedance bandwidth, without the need for a matching network. The measured results of the return loss and radiation patterns on a fabricated prototype show excellent agreement with the numerical data. The antenna structure is very compact and when used as a primary feed in offset reflectors it reduces the cross polarization.
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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) | 0.001 | 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 | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".