Design of a Ultra Wideband Ridged Waveguide Turnstile Orthomode Transducer for mm-Wave Radio Astronomy Applications
Bibliographic record
Abstract
Ridged waveguide technology is applied to design a wideband turnstile orthomode transducer (OMT) for radio astronomy applications. The OMT features a quad-ridged circular input waveguide that supports dual-polarization. It includes two single-ridged rectangular waveguide output ports. The design incorporates a two-fold symmetric turnstile junction at the input, facilitating effective mode coupling. An intermediate section with cylindrical components is used for impedance matching. The turnstile junction is connected to a ridged T-junction combiner via E-plane bends. The performance of the OMT is evaluated using two full-wave electromagnetic simulation tools, CST Microwave Studio and HFSS. Operating over a frequency range of 65 − 165 GHz, the OMT demonstrates a reflection coefficient better than almost −20 dB for both polarization modes, an average transmission loss of$0.2-0.5 \text{dB}$, and isolation and cross-polarization leakage levels exceeding 80 dB and 58 dB, respectively, across the entire band.
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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 | 0.001 | 0.000 |
| 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".