Microwave phase shifter implemented in photonic technology
Bibliographic record
Abstract
There are many applications where a very wideband phase shifter is required. Analog pre-distorters to linearize Ka-band amplifiers require a frequency-independent phase shift over at least 1 GHz. The same requirement applies to phased-array antennas or antenna feeds, as well as direct radiating array antennas. Most electrical phase shifters have a fixed operating frequency, discrete phase shift steps (e.g., 5-bit control) and some frequency and temperature dependent responses which result in sub-optimum system performance. The requirements in the 50/40 GHz band will be even more demanding where the bandwidth to be covered could extend up to 5 GHz. The use of photonic technology mitigates the limitations of electrical phase shifters. Operation over a wide range of frequencies (e.g., 4 to 50 GHz) using a single design is possible, and a flat phase response over many GHz's can be achieved. This paper discusses the use of novel microwave photonic technologies to enhance the performance of a broadband phase shifter with respect to power, mass, volume, electromagnetic interference and compatibility of future on-board satellite subsystems. The targeted phase shifter is equally applicable to analog linearizers, phased-array antennas/feeds or other smart antenna schemes where relative phase shifts are required. The results of a prototype phase shifter are presented showing a broadband response over several GHz. Limitations of this device and justification for an integrated version will be discussed. Finally, preliminary results for an integrated device are presented.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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 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".