Extremely electrically small MF/HF antenna
Bibliographic record
Abstract
This study presents an extremely small frequency‐tunable monopole antenna operating at medium frequency/high frequency (MF/HF) band with an omnidirectional radiation pattern. Most of the existing miniaturisation techniques operate at low bandwidth as well as low efficiency. The design is based on a capacitive top, allowing the antenna to resonate at much lower frequencies, and a tunable inductive centre loaded. Utilising the capacitive top, the radiation resistance of the antenna is significantly increased. The resonant frequency can be tuned over a wide range of frequency (0.974–30 MHz) without changing the antenna total size by virtue of the tunable loading coil. The tuning system contains arms, motors, contactor, microcontroller and remote control. The experimental results are 0.0032 λ, ka = 0.01, | S 11 | = − 15.8 dB, gain = −13.9 dBi and ɳ = 2.2% at its lowest resonant frequency.
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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) | 0.002 | 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".