Packaged Tunable Bandpass Filters Based on Varactor-Loaded Spiral Combline Topology
Bibliographic record
Abstract
This article describes the winning work at the student packaged broadband tunable bandpass filters design competition at the 2012 IEEE MTT-S International Microwave Symposium (IMS2012), Montreal, Canada. According to the competition design rules, the broadband tunable bandpass filter circuitry must be planar on a printed circuit board and securely mounted in the metal package with a copper tape lid. The lumped surface-mount components, including resistors, capacitors, and varactors, are allowed and must be tightly mounted on the printed circuit board. The evaluation board will be an unenclosed printed circuit board with 50-X traces connecting the RF ports of the package to the standard 50-X female subminiature version A (SMA) connectors. The filter performance was evaluated based on the measurement performance between the SMA connectors. Figure 1 illustrates the evaluation criteria of tunable bandpass filters. During the in-situ competition evaluation, the voltage range limited between 0 and 20 V was provided for the designers to realize two passbands. The first band specifications are: 1) the passband 965-1035 MHz, 2) the passband insertion loss less than 4.5 dB, 3) the passband return loss more than 15 dB, an 4) the insertion loss for the frequency lower than bandpass filter architecture was designed, which employed the varactor-loaded spiral combline resonator topology with stepped-impedance coupled lines at the input and output ports. The design considerations and measurement results are described.
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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 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 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".