Wide‐bandwidth inverted‐F stub fed hybrid loop antenna for 5G sub‐6 GHz massive MIMO enabled handsets
Bibliographic record
Abstract
A ten‐element multi‐antenna terminal for massive multiple‐input–multiple‐output (MIMO) in the fifth‐generation (5G) sub‐6 GHz with wide impedance bandwidth (IBW) is proposed. A grounded coplanar waveguide is employed to feed an inverted‐F stub coupled to a hybrid loop antenna element. Through tuning, the multiple resonant modes are combined so that a wide IBW is achieved. Antenna element sites are selected along the periphery of the typical smartphone back plane of size . To improve the diversity performance, two elements are placed along the horizontal edge orthogonal to the rest of elements placed along the vertical side. The prototype of the antenna is fabricated and measured exhibiting a wide IBW of ( dB) 63% centred around 4.68 GHz. The minimum measured isolation achieved is 18 dB. The maximum simulated envelope correlation coefficient is found to be 0.21 and while the minimum antenna efficiency is 78.4%. Each element has a form factor of and printed on a 1.52 mm thick Rogers 4003 substrate with and . The proposed multi‐antenna terminal is suitable for 5G sub‐6 GHz (3.2–6.1 GHz) communication including long‐term evolution bands 42, 43 and 46.
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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 | 0.001 | 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".