Compact Rear-Radiating Circularly Polarized Feeds for Front-Fed Reflector Antennas
Bibliographic record
Abstract
Unique backward radiation properties of compact four-arm Archimedean spiral antennas are explored and investigated. Conventionally, an active zone in the order of one wavelength is required to have the spiral antenna work in its first mode of operation, producing broadside radiation patterns. In this letter, it is shown that a reflector-backed four-arm spiral antenna with a diameter of much less than the conventional active zone is capable of effectively directing the same broadside radiation into the backward region with an opposite sense of polarization. The antenna such developed is well suited as a primary feed in small front-fed parabolic reflector antennas. The circular polarization performance of the proposed antenna is investigated including the circularly polarized gain, axial ratios, beamwidths, and cross polarization. Furthermore, the performance of the compact rear-radiating antenna as a primary feed in parabolic reflector antennas is investigated, proving the promising applications of the proposed compact feeds with backward radiation patterns.
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 | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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".