SIW-Fed Inner CDRA Inserted Into Outer Frustum-Capped DRA to Reduce ECC for CF-mMIMO Application
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Bibliographic record
Abstract
This paper presents a novel design approach wherein an inner cylindrical dielectric resonator antenna (DRA) made of a low-permittivity material is inserted within an outer 3-layer hybrid stacked frustum-capped DRA constructed from a high-permittivity dielectric material. This configuration is proposed to effectively reduce the envelope correlation coefficient (ECC) by 45.4% and improve isolation by 20% while preserving the high gain performance characteristic of substrate integrated waveguide (SIW)-fed multiple-input multiple-output (MIMO) DRAs. The use of SIW feeding contributes to improved isolation among MIMO elements. The high gain achieved by the DRAs is attributed to the implementation of a novel hybrid stacking technique. The entire DRA structure is fabricated using 3D printing technology, which makes it lighter than conventional ceramic DRA implementations. These 3-D printed DRAs are biodegradable and easy to install in access points of a cell-free massive MIMO network (CF-mMIMO). The antenna operates in the HEM115 mode and exhibits a broadside radiation pattern. The antenna exhibits a 200 MHz (5.39 - 5.59 GHz) bandwidth, 7.8 dBi peak gain, -30 dB isolation, and a low ECC of 0.06.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.003 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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 it