Design of a broadband microwave absorber from wideband receiving antenna array
Bibliographic record
Abstract
Abstract In some extent, microwave absorbers and receiving antennas have some similarities, for both of them aim at receiving the ambient electromagnetic wave around. The essential difference between them is that the receiving antenna must transmit the EM wave to the loading system, but the microwave absorber just need to dissipate them. In this work, we studied a novel broadband microwave absorber, which is achieved from a wideband folded‐dipole antenna array backed through a quarter‐wavelength spacer by a metal ground. By studying the impedance locus of the folded dipole array on Smith chart, the authors first obtained a wideband folded‐dipole array antenna, and then changed it to an absorber by replacing the excitations with lump resistors. Both simulation and measurement results show that the folded‐dipole array‐based microwave absorber can achieve a wide bandwidth of 100% at the normal incident waves as in mode of antenna array, while the center frequency is at 5.5 GHz. Meanwhile, the −10 dB bandwidth of the absorber can still be over 90% at an oblique incident waves of 30°.
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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".