Metamaterial Absorber Structure for Tx-Rx Antenna Isolation Improvement in Full-Duplex Massive MIMO
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Bibliographic record
Abstract
This paper presents a novel metamaterial absorber structure for Tx-Rx antenna isolation improvement in the in-band full-duplex massive MIMO systems. The design processes of the absorber unit element, structure and placement, and their impacts on the beamforming radiation patterns are studied. The illustrative result indicates an over 99.8% power absorption at 3.49 GHz. Working with our 8×8Tx/8×8Rx full-duplex antenna array prototype, an average Tx-Rx antenna element mutual coupling level of -65.4 dB can be achieved between the closest Tx-Rx element pairs, indicating an improvement of 17.5 dB isolation by adding the absorber. The absorber structure’s effectiveness in suppressing beam-level self-interference is studied. The experimental measurement results, utilizing sample Tx/Rx 1×8 antenna sub-arrays, show an average beam-level isolation enhancement of 18.6 dB in near-field coupling dominant scenarios. Integrated with a simple angular perturbation beam isolation technique, an average Tx-Rx beam-level isolation of 90.8 dB and a maximum beam isolation of 104.4 dB can be reached in the Tx/Rx beam steering range -48° to 48° with 20 MHz modulated signals. The experiment illustrates the metamaterial absorber structure has a negligible influence on the far-field beam pattern in the beamforming process. Simulation and measured results on beam radiation patterns and far-field and near-field isolation improvement in different scenarios are investigated and shown to be in good agreement.
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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) | 0.000 | 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) | 0.000 | 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