Bibliographic record
Abstract
In this letter, two very compact designs of miniaturized four-element planar inverted-F antennas (PIFAs) are proposed for 2.45 GHz multiple-input-multiple-output (MIMO) applications. The first configuration exhibits pattern diversity, while the second exploits hybrid pattern and polarization diversity. Both the configurations are designed over a small ground plane measuring 105 × 55 mm2in area, while each antenna element occupies a volume of only 0.455 cm3. Diversity performance criteria, namely envelope correlation coefficient (ECC) and mean effective gain (MEG), are studied. Effective diversity gain (EDG) using maximal ratio combining (MRC) and selection combining (SC) are then derived for a Rayleigh fading environment. The diversity gains are also measured in the reverberation chamber, which emulates Rayleigh fading, and show excellent agreement with the analytical results. In addition, MIMO channel capacities measured in the chamber depict how robust and efficient the two multiantenna configurations are in the rich scattering environment .
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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 | 0.000 | 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".