Low-Cost, Microstrip-Fed Printed Dipole for Prime Focus Reflector Feed
Bibliographic record
Abstract
A low cost printed dipole antenna is proposed as a feed for prime focus reflectors. Its geometry is arranged such that the two dipole arms are on opposite sides of a dielectric substrate, fed by a microstrip line. A printed dipole-reflector is placed parasitically in front of the radiating dipole arms to make its radiation backward, toward the microstrip line. This allows mounting the feed centrally on a parabolic reflector from its apex, eliminating the needs for supporting struts. The feed antenna offers an impedance bandwidth of 16.5%, when printed on a substrate of dielectric constant 2.5, and an overall dimension of 60$\,\times\,$60$\,\times\,$1.58${\rm mm}^{3}$at 3 GHz. Its impedance bandwidth is enhanced up to 29.1% by modifying the feed line. The pattern symmetry and cross-polarization of the antenna are improved by slightly changing the arms length. Its performance on a small available deep dish, with$f/D=0.25$and$D=45~{\rm cm}$, is experimentally calculated at 3 GHz, and overall efficiency of 55% is measured. For further verification, a second feed for operation at 6 GHz is also designed and verified on the same reflector, providing the same level of efficiency.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 0.008 |
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".