Dual-Band SIW Metasurface Filtering Antenna With High Inter-Band Selectivity
Bibliographic record
Abstract
A highly selective dual-band filtering antenna based on a perturbed substrate integrated waveguide (SIW) cavity and a non-uniform metasurface (MTS) is presented. The structure is compact, only requiring two substrate layers while providing five radiation frequency nulls. The first layer is composed of a filtering cavity which employs the perturbed second- and third-order modes to support the two passbands. The cavity is designed to satisfy the coupling requirements of a filtering doublet, implementing three controllable inter-band transmission zeros (TZ) along with a fourth TZ above the second passband. The second layer employs a non-uniform MTS which acts as an equivalent radiating load. The novel non-uniform MTS is designed to adequately match both passbands providing a high and flat realized gain, improve the higher frequency radiation patterns, retain the intrinsic filtering function and introduce an additional inter-band radiation frequency null. A prototype is fabricated and measured demonstrating two 10 dB fractional bandwidths of 7.9% and 11.0%, each centered around 19 GHz and 27 GHz respectively. The passband’s demonstrate a flat in-band realized gain around 7.7 dB and 9.8 dB respectively. Additionally, both bands exhibit a very sharp roll-off and an inter-band attenuation greater than 26.5 dB due to the four inter-band frequency nulls at 21 GHz, 22 GHz, 23.3 GHz and 25.1 GHz along with an additional frequency null located above the second passband at 29.5 GHz.
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How this classification was reachedexpand
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 | 0.000 |
| Open science | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".