Bibliographic record
Abstract
This thesis presents two different types of high-power gallium nitride (GaN) phase shifters designed for X-band (8-12 GHz) but offering good performance over a much wider band. The first type of phase shifter is a novel design having 22.5phase shift, which promises wide bandwidth (in this case limited by the SPDT switch also designed), but achieves decent insertion loss (5 dB), good return loss (better than 11 dB) and very low phase variation (1) across X-band. The components for a 45differential phase shift using the same structure were also fabricated and verified with measurements. The second type of phase shifter is a 22.5switched-filter phase shifter which has much wider bandwidth than is typically found with this configuration, while maintaining low insertion loss (<2 dB), good return loss (>11.15 dB) and an amplitude imbalance of less than 1.03 dB across X-band. The 1 dB compression point was higher than the laboratory equipment was able to measure (>38 dBm) and the phase shifter monolithic microwave integrated circuit (MMIC) exhibited an input-referred thirdii ABSTRACT iii order intercept point (IIP 3 ) higher than 46 dBm. A K-band phase shifter was also designed to test the limits of the technology. The high-power phase shifters have been fabricated in a 0.5 m GaN HEMT process and were designed using an accurate, customized switch HEMT model. Suspended inductors offering improved quality factor and increased self-resonance frequency were also used in the design of some of the phase shifters. I must also thank Dr. Khelifa Hettak from
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| 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 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".