Compact In-Line Multiband Bandpass Filters With Independently Controllable Passbands Using Quarter-Mode SIW Cavities
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Bibliographic record
Abstract
This paper presents a compact multi-band bandpass filter using a novel multimode quarter-mode substrate integrated waveguide cavity (QMSIWC) for sub-6 GHz frequencies. The first four resonating modes (TM<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">010</sub>, TM<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">210</sub>, TM<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">020</sub> and TM<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">410</sub>) are utilized for realizing multiple passbands. The slot perturbations are introduced in the cavity for the flexible and independent control of center frequencies and bandwidths of passbands. The design incorporates transmission zeros for passband isolation in an in-line topology using modal bypass coupling. Five experimental prototypes, including three second order designs of dual/tri/quad-band responses, two fourth order designs of dual/tri-band responses with high selectivity using novel coupling structure are synthesized, designed, fabricated and tested to validate the proposed design procedure. The measured insertion loss and return loss at the center frequency of these are better than 2 dB and 18 dB, respectively.
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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 | 0.001 | 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 | 0.001 |
| 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