Compact and low cost substrate integrated waveguide cavity and bandpass filter using surface mount shorting stubs
Bibliographic record
Abstract
A compact and low cost substrate integrated waveguide (SIW) cavity and bandpass filter using Surface Mount (SM) shorting stubs is proposed in this paper. These cavity and filter allows a drastically reduction in Printed Circuit Board (PCB) footprint. They are compact and also low cost as there fabrication involves standard PCB process and SM technologies. For demonstration purpose, one cavity and one 7th order bandpass filter were designed and fabricated over Ka-band. The cavity is designed at the center frequency of 34 GHz. It achieves an unloaded Qu factor of 201 with a footprint of only 1.9 × 6.3 mm2compared to 5.38 × 6.3 mm for a planar cavity. Then, a 7th order filter is designed at the center frequency of 34.5 GHz. It provides a sharp frequency selectivity using arranged transmission-zeros and achieves a bandwidth of 1 GHz with an insertion loss of better than 2.9 dB with a footprint of only 11.2 × 6.3 mm2. The experimental prototypes achieve good performances. They potentially have many applications in microwave and millimeter wave devices, circuits and systems.
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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) | 0.001 | 0.001 |
| 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 | 0.001 | 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".