Highly Efficient Unidirectional Twin Arc-Slot Antennas on Electrically Thin Substrates
Bibliographic record
Abstract
Unidirectional, highly-efficient planar twin arc-slot antenna elements backed by a reflector are presented. The theoretical radiation efficiency is as high as 99.9%. This high efficiency is achieved because the proposed slot geometry reduces the coupling to the parallel-plate TEM mode effectively in all directions on the substrate plane. A corporate-fed as well as a compact, center-fed, twin arc-slot elements have been implemented and tested. The parallel-plate TEM substrate patterns for a representative twin arc-slot element have been measured and compared with those of a corresponding straight twin-slot element. It was verified that the parallel-plate TEM mode, coupled from the proposed twin arc-slot element is greatly reduced in all directions. The measured gain improvement when a back-reflector is added is found to be about 2.8 dB, further validating this high efficiency. In addition to the high radiation efficiency, the proposed twin arc-slot element is more compact compared to the corresponding, straight, full-wavelength twin-slot element, making it well-suited for two-dimensional antenna arrays.
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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 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 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".